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1 | /* parse.y - Yacc grammar for bash. */ | |
2 | ||
3 | /* Copyright (C) 1989-2015 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software: you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | %{ | |
22 | #include "config.h" | |
23 | ||
24 | #include "bashtypes.h" | |
25 | #include "bashansi.h" | |
26 | ||
27 | #include "filecntl.h" | |
28 | ||
29 | #if defined (HAVE_UNISTD_H) | |
30 | # include <unistd.h> | |
31 | #endif | |
32 | ||
33 | #if defined (HAVE_LOCALE_H) | |
34 | # include <locale.h> | |
35 | #endif | |
36 | ||
37 | #include <stdio.h> | |
38 | #include "chartypes.h" | |
39 | #include <signal.h> | |
40 | ||
41 | #include "memalloc.h" | |
42 | ||
43 | #include "bashintl.h" | |
44 | ||
45 | #define NEED_STRFTIME_DECL /* used in externs.h */ | |
46 | ||
47 | #include "shell.h" | |
48 | #include "typemax.h" /* SIZE_MAX if needed */ | |
49 | #include "trap.h" | |
50 | #include "flags.h" | |
51 | #include "parser.h" | |
52 | #include "mailcheck.h" | |
53 | #include "test.h" | |
54 | #include "builtins.h" | |
55 | #include "builtins/common.h" | |
56 | #include "builtins/builtext.h" | |
57 | ||
58 | #include "shmbutil.h" | |
59 | ||
60 | #if defined (READLINE) | |
61 | # include "bashline.h" | |
62 | # include <readline/readline.h> | |
63 | #endif /* READLINE */ | |
64 | ||
65 | #if defined (HISTORY) | |
66 | # include "bashhist.h" | |
67 | # include <readline/history.h> | |
68 | #endif /* HISTORY */ | |
69 | ||
70 | #if defined (JOB_CONTROL) | |
71 | # include "jobs.h" | |
72 | #else | |
73 | extern int cleanup_dead_jobs __P((void)); | |
74 | #endif /* JOB_CONTROL */ | |
75 | ||
76 | #if defined (ALIAS) | |
77 | # include "alias.h" | |
78 | #else | |
79 | typedef void *alias_t; | |
80 | #endif /* ALIAS */ | |
81 | ||
82 | #if defined (PROMPT_STRING_DECODE) | |
83 | # ifndef _MINIX | |
84 | # include <sys/param.h> | |
85 | # endif | |
86 | # include <time.h> | |
87 | # if defined (TM_IN_SYS_TIME) | |
88 | # include <sys/types.h> | |
89 | # include <sys/time.h> | |
90 | # endif /* TM_IN_SYS_TIME */ | |
91 | # include "maxpath.h" | |
92 | #endif /* PROMPT_STRING_DECODE */ | |
93 | ||
94 | #define RE_READ_TOKEN -99 | |
95 | #define NO_EXPANSION -100 | |
96 | ||
97 | #ifdef DEBUG | |
98 | # define YYDEBUG 1 | |
99 | #else | |
100 | # define YYDEBUG 0 | |
101 | #endif | |
102 | ||
103 | #if defined (HANDLE_MULTIBYTE) | |
104 | # define last_shell_getc_is_singlebyte \ | |
105 | ((shell_input_line_index > 1) \ | |
106 | ? shell_input_line_property[shell_input_line_index - 1] \ | |
107 | : 1) | |
108 | # define MBTEST(x) ((x) && last_shell_getc_is_singlebyte) | |
109 | #else | |
110 | # define last_shell_getc_is_singlebyte 1 | |
111 | # define MBTEST(x) ((x)) | |
112 | #endif | |
113 | ||
114 | #if defined (EXTENDED_GLOB) | |
115 | extern int extended_glob; | |
116 | #endif | |
117 | ||
118 | extern int eof_encountered; | |
119 | extern int no_line_editing, running_under_emacs; | |
120 | extern int current_command_number; | |
121 | extern int sourcelevel, parse_and_execute_level; | |
122 | extern int posixly_correct; | |
123 | extern int last_command_exit_value; | |
124 | extern pid_t last_command_subst_pid; | |
125 | extern char *shell_name, *current_host_name; | |
126 | extern char *dist_version; | |
127 | extern int patch_level; | |
128 | extern int dump_translatable_strings, dump_po_strings; | |
129 | extern sh_builtin_func_t *last_shell_builtin, *this_shell_builtin; | |
130 | extern int here_doc_first_line; | |
131 | #if defined (BUFFERED_INPUT) | |
132 | extern int bash_input_fd_changed; | |
133 | #endif | |
134 | ||
135 | extern int errno; | |
136 | /* **************************************************************** */ | |
137 | /* */ | |
138 | /* "Forward" declarations */ | |
139 | /* */ | |
140 | /* **************************************************************** */ | |
141 | ||
142 | #ifdef DEBUG | |
143 | static void debug_parser __P((int)); | |
144 | #endif | |
145 | ||
146 | static int yy_getc __P((void)); | |
147 | static int yy_ungetc __P((int)); | |
148 | ||
149 | #if defined (READLINE) | |
150 | static int yy_readline_get __P((void)); | |
151 | static int yy_readline_unget __P((int)); | |
152 | #endif | |
153 | ||
154 | static int yy_string_get __P((void)); | |
155 | static int yy_string_unget __P((int)); | |
156 | static void rewind_input_string __P((void)); | |
157 | static int yy_stream_get __P((void)); | |
158 | static int yy_stream_unget __P((int)); | |
159 | ||
160 | static int shell_getc __P((int)); | |
161 | static void shell_ungetc __P((int)); | |
162 | static void discard_until __P((int)); | |
163 | ||
164 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
165 | static void push_string __P((char *, int, alias_t *)); | |
166 | static void pop_string __P((void)); | |
167 | static void free_string_list __P((void)); | |
168 | #endif | |
169 | ||
170 | static char *read_a_line __P((int)); | |
171 | ||
172 | static int reserved_word_acceptable __P((int)); | |
173 | static int yylex __P((void)); | |
174 | ||
175 | static void push_heredoc __P((REDIRECT *)); | |
176 | static char *mk_alexpansion __P((char *)); | |
177 | static int alias_expand_token __P((char *)); | |
178 | static int time_command_acceptable __P((void)); | |
179 | static int special_case_tokens __P((char *)); | |
180 | static int read_token __P((int)); | |
181 | static char *parse_matched_pair __P((int, int, int, int *, int)); | |
182 | static char *parse_comsub __P((int, int, int, int *, int)); | |
183 | #if defined (ARRAY_VARS) | |
184 | static char *parse_compound_assignment __P((int *)); | |
185 | #endif | |
186 | #if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND) | |
187 | static int parse_dparen __P((int)); | |
188 | static int parse_arith_cmd __P((char **, int)); | |
189 | #endif | |
190 | #if defined (COND_COMMAND) | |
191 | static void cond_error __P((void)); | |
192 | static COND_COM *cond_expr __P((void)); | |
193 | static COND_COM *cond_or __P((void)); | |
194 | static COND_COM *cond_and __P((void)); | |
195 | static COND_COM *cond_term __P((void)); | |
196 | static int cond_skip_newlines __P((void)); | |
197 | static COMMAND *parse_cond_command __P((void)); | |
198 | #endif | |
199 | #if defined (ARRAY_VARS) | |
200 | static int token_is_assignment __P((char *, int)); | |
201 | static int token_is_ident __P((char *, int)); | |
202 | #endif | |
203 | static int read_token_word __P((int)); | |
204 | static void discard_parser_constructs __P((int)); | |
205 | ||
206 | static char *error_token_from_token __P((int)); | |
207 | static char *error_token_from_text __P((void)); | |
208 | static void print_offending_line __P((void)); | |
209 | static void report_syntax_error __P((char *)); | |
210 | ||
211 | static void handle_eof_input_unit __P((void)); | |
212 | static void prompt_again __P((void)); | |
213 | #if 0 | |
214 | static void reset_readline_prompt __P((void)); | |
215 | #endif | |
216 | static void print_prompt __P((void)); | |
217 | ||
218 | #if defined (HANDLE_MULTIBYTE) | |
219 | static void set_line_mbstate __P((void)); | |
220 | static char *shell_input_line_property = NULL; | |
221 | #else | |
222 | # define set_line_mbstate() | |
223 | #endif | |
224 | ||
225 | extern int yyerror __P((const char *)); | |
226 | ||
227 | #ifdef DEBUG | |
228 | extern int yydebug; | |
229 | #endif | |
230 | ||
231 | /* Default prompt strings */ | |
232 | char *primary_prompt = PPROMPT; | |
233 | char *secondary_prompt = SPROMPT; | |
234 | ||
235 | /* PROMPT_STRING_POINTER points to one of these, never to an actual string. */ | |
236 | char *ps1_prompt, *ps2_prompt; | |
237 | ||
238 | /* Displayed after reading a command but before executing it in an interactive shell */ | |
239 | char *ps0_prompt; | |
240 | ||
241 | /* Handle on the current prompt string. Indirectly points through | |
242 | ps1_ or ps2_prompt. */ | |
243 | char **prompt_string_pointer = (char **)NULL; | |
244 | char *current_prompt_string; | |
245 | ||
246 | /* Non-zero means we expand aliases in commands. */ | |
247 | int expand_aliases = 0; | |
248 | ||
249 | /* If non-zero, the decoded prompt string undergoes parameter and | |
250 | variable substitution, command substitution, arithmetic substitution, | |
251 | string expansion, process substitution, and quote removal in | |
252 | decode_prompt_string. */ | |
253 | int promptvars = 1; | |
254 | ||
255 | /* If non-zero, $'...' and $"..." are expanded when they appear within | |
256 | a ${...} expansion, even when the expansion appears within double | |
257 | quotes. */ | |
258 | int extended_quote = 1; | |
259 | ||
260 | /* The number of lines read from input while creating the current command. */ | |
261 | int current_command_line_count; | |
262 | ||
263 | /* The number of lines in a command saved while we run parse_and_execute */ | |
264 | int saved_command_line_count; | |
265 | ||
266 | /* The token that currently denotes the end of parse. */ | |
267 | int shell_eof_token; | |
268 | ||
269 | /* The token currently being read. */ | |
270 | int current_token; | |
271 | ||
272 | /* The current parser state. */ | |
273 | int parser_state; | |
274 | ||
275 | /* Variables to manage the task of reading here documents, because we need to | |
276 | defer the reading until after a complete command has been collected. */ | |
277 | static REDIRECT *redir_stack[HEREDOC_MAX]; | |
278 | int need_here_doc; | |
279 | ||
280 | /* Where shell input comes from. History expansion is performed on each | |
281 | line when the shell is interactive. */ | |
282 | static char *shell_input_line = (char *)NULL; | |
283 | static size_t shell_input_line_index; | |
284 | static size_t shell_input_line_size; /* Amount allocated for shell_input_line. */ | |
285 | static size_t shell_input_line_len; /* strlen (shell_input_line) */ | |
286 | ||
287 | /* Either zero or EOF. */ | |
288 | static int shell_input_line_terminator; | |
289 | ||
290 | /* The line number in a script on which a function definition starts. */ | |
291 | static int function_dstart; | |
292 | ||
293 | /* The line number in a script on which a function body starts. */ | |
294 | static int function_bstart; | |
295 | ||
296 | /* The line number in a script at which an arithmetic for command starts. */ | |
297 | static int arith_for_lineno; | |
298 | ||
299 | /* The decoded prompt string. Used if READLINE is not defined or if | |
300 | editing is turned off. Analogous to current_readline_prompt. */ | |
301 | static char *current_decoded_prompt; | |
302 | ||
303 | /* The last read token, or NULL. read_token () uses this for context | |
304 | checking. */ | |
305 | static int last_read_token; | |
306 | ||
307 | /* The token read prior to last_read_token. */ | |
308 | static int token_before_that; | |
309 | ||
310 | /* The token read prior to token_before_that. */ | |
311 | static int two_tokens_ago; | |
312 | ||
313 | static int global_extglob; | |
314 | ||
315 | /* The line number in a script where the word in a `case WORD', `select WORD' | |
316 | or `for WORD' begins. This is a nested command maximum, since the array | |
317 | index is decremented after a case, select, or for command is parsed. */ | |
318 | #define MAX_CASE_NEST 128 | |
319 | static int word_lineno[MAX_CASE_NEST+1]; | |
320 | static int word_top = -1; | |
321 | ||
322 | /* If non-zero, it is the token that we want read_token to return | |
323 | regardless of what text is (or isn't) present to be read. This | |
324 | is reset by read_token. If token_to_read == WORD or | |
325 | ASSIGNMENT_WORD, yylval.word should be set to word_desc_to_read. */ | |
326 | static int token_to_read; | |
327 | static WORD_DESC *word_desc_to_read; | |
328 | ||
329 | static REDIRECTEE source; | |
330 | static REDIRECTEE redir; | |
331 | %} | |
332 | ||
333 | %union { | |
334 | WORD_DESC *word; /* the word that we read. */ | |
335 | int number; /* the number that we read. */ | |
336 | WORD_LIST *word_list; | |
337 | COMMAND *command; | |
338 | REDIRECT *redirect; | |
339 | ELEMENT element; | |
340 | PATTERN_LIST *pattern; | |
341 | } | |
342 | ||
343 | /* Reserved words. Members of the first group are only recognized | |
344 | in the case that they are preceded by a list_terminator. Members | |
345 | of the second group are for [[...]] commands. Members of the | |
346 | third group are recognized only under special circumstances. */ | |
347 | %token IF THEN ELSE ELIF FI CASE ESAC FOR SELECT WHILE UNTIL DO DONE FUNCTION COPROC | |
348 | %token COND_START COND_END COND_ERROR | |
349 | %token IN BANG TIME TIMEOPT TIMEIGN | |
350 | ||
351 | /* More general tokens. yylex () knows how to make these. */ | |
352 | %token <word> WORD ASSIGNMENT_WORD REDIR_WORD | |
353 | %token <number> NUMBER | |
354 | %token <word_list> ARITH_CMD ARITH_FOR_EXPRS | |
355 | %token <command> COND_CMD | |
356 | %token AND_AND OR_OR GREATER_GREATER LESS_LESS LESS_AND LESS_LESS_LESS | |
357 | %token GREATER_AND SEMI_SEMI SEMI_AND SEMI_SEMI_AND | |
358 | %token LESS_LESS_MINUS AND_GREATER AND_GREATER_GREATER LESS_GREATER | |
359 | %token GREATER_BAR BAR_AND | |
360 | ||
361 | /* The types that the various syntactical units return. */ | |
362 | ||
363 | %type <command> inputunit command pipeline pipeline_command | |
364 | %type <command> list list0 list1 compound_list simple_list simple_list1 | |
365 | %type <command> simple_command shell_command | |
366 | %type <command> for_command select_command case_command group_command | |
367 | %type <command> arith_command | |
368 | %type <command> cond_command | |
369 | %type <command> arith_for_command | |
370 | %type <command> coproc | |
371 | %type <command> function_def function_body if_command elif_clause subshell | |
372 | %type <redirect> redirection redirection_list | |
373 | %type <element> simple_command_element | |
374 | %type <word_list> word_list pattern | |
375 | %type <pattern> pattern_list case_clause_sequence case_clause | |
376 | %type <number> timespec | |
377 | %type <number> list_terminator | |
378 | ||
379 | %start inputunit | |
380 | ||
381 | %left '&' ';' '\n' yacc_EOF | |
382 | %left AND_AND OR_OR | |
383 | %right '|' BAR_AND | |
384 | %% | |
385 | ||
386 | inputunit: simple_list simple_list_terminator | |
387 | { | |
388 | /* Case of regular command. Discard the error | |
389 | safety net,and return the command just parsed. */ | |
390 | global_command = $1; | |
391 | eof_encountered = 0; | |
392 | /* discard_parser_constructs (0); */ | |
393 | if (parser_state & PST_CMDSUBST) | |
394 | parser_state |= PST_EOFTOKEN; | |
395 | YYACCEPT; | |
396 | } | |
397 | | '\n' | |
398 | { | |
399 | /* Case of regular command, but not a very | |
400 | interesting one. Return a NULL command. */ | |
401 | global_command = (COMMAND *)NULL; | |
402 | if (parser_state & PST_CMDSUBST) | |
403 | parser_state |= PST_EOFTOKEN; | |
404 | YYACCEPT; | |
405 | } | |
406 | | error '\n' | |
407 | { | |
408 | /* Error during parsing. Return NULL command. */ | |
409 | global_command = (COMMAND *)NULL; | |
410 | eof_encountered = 0; | |
411 | /* discard_parser_constructs (1); */ | |
412 | if (interactive && parse_and_execute_level == 0) | |
413 | { | |
414 | YYACCEPT; | |
415 | } | |
416 | else | |
417 | { | |
418 | YYABORT; | |
419 | } | |
420 | } | |
421 | | yacc_EOF | |
422 | { | |
423 | /* Case of EOF seen by itself. Do ignoreeof or | |
424 | not. */ | |
425 | global_command = (COMMAND *)NULL; | |
426 | handle_eof_input_unit (); | |
427 | YYACCEPT; | |
428 | } | |
429 | ; | |
430 | ||
431 | word_list: WORD | |
432 | { $$ = make_word_list ($1, (WORD_LIST *)NULL); } | |
433 | | word_list WORD | |
434 | { $$ = make_word_list ($2, $1); } | |
435 | ; | |
436 | ||
437 | redirection: '>' WORD | |
438 | { | |
439 | source.dest = 1; | |
440 | redir.filename = $2; | |
441 | $$ = make_redirection (source, r_output_direction, redir, 0); | |
442 | } | |
443 | | '<' WORD | |
444 | { | |
445 | source.dest = 0; | |
446 | redir.filename = $2; | |
447 | $$ = make_redirection (source, r_input_direction, redir, 0); | |
448 | } | |
449 | | NUMBER '>' WORD | |
450 | { | |
451 | source.dest = $1; | |
452 | redir.filename = $3; | |
453 | $$ = make_redirection (source, r_output_direction, redir, 0); | |
454 | } | |
455 | | NUMBER '<' WORD | |
456 | { | |
457 | source.dest = $1; | |
458 | redir.filename = $3; | |
459 | $$ = make_redirection (source, r_input_direction, redir, 0); | |
460 | } | |
461 | | REDIR_WORD '>' WORD | |
462 | { | |
463 | source.filename = $1; | |
464 | redir.filename = $3; | |
465 | $$ = make_redirection (source, r_output_direction, redir, REDIR_VARASSIGN); | |
466 | } | |
467 | | REDIR_WORD '<' WORD | |
468 | { | |
469 | source.filename = $1; | |
470 | redir.filename = $3; | |
471 | $$ = make_redirection (source, r_input_direction, redir, REDIR_VARASSIGN); | |
472 | } | |
473 | | GREATER_GREATER WORD | |
474 | { | |
475 | source.dest = 1; | |
476 | redir.filename = $2; | |
477 | $$ = make_redirection (source, r_appending_to, redir, 0); | |
478 | } | |
479 | | NUMBER GREATER_GREATER WORD | |
480 | { | |
481 | source.dest = $1; | |
482 | redir.filename = $3; | |
483 | $$ = make_redirection (source, r_appending_to, redir, 0); | |
484 | } | |
485 | | REDIR_WORD GREATER_GREATER WORD | |
486 | { | |
487 | source.filename = $1; | |
488 | redir.filename = $3; | |
489 | $$ = make_redirection (source, r_appending_to, redir, REDIR_VARASSIGN); | |
490 | } | |
491 | | GREATER_BAR WORD | |
492 | { | |
493 | source.dest = 1; | |
494 | redir.filename = $2; | |
495 | $$ = make_redirection (source, r_output_force, redir, 0); | |
496 | } | |
497 | | NUMBER GREATER_BAR WORD | |
498 | { | |
499 | source.dest = $1; | |
500 | redir.filename = $3; | |
501 | $$ = make_redirection (source, r_output_force, redir, 0); | |
502 | } | |
503 | | REDIR_WORD GREATER_BAR WORD | |
504 | { | |
505 | source.filename = $1; | |
506 | redir.filename = $3; | |
507 | $$ = make_redirection (source, r_output_force, redir, REDIR_VARASSIGN); | |
508 | } | |
509 | | LESS_GREATER WORD | |
510 | { | |
511 | source.dest = 0; | |
512 | redir.filename = $2; | |
513 | $$ = make_redirection (source, r_input_output, redir, 0); | |
514 | } | |
515 | | NUMBER LESS_GREATER WORD | |
516 | { | |
517 | source.dest = $1; | |
518 | redir.filename = $3; | |
519 | $$ = make_redirection (source, r_input_output, redir, 0); | |
520 | } | |
521 | | REDIR_WORD LESS_GREATER WORD | |
522 | { | |
523 | source.filename = $1; | |
524 | redir.filename = $3; | |
525 | $$ = make_redirection (source, r_input_output, redir, REDIR_VARASSIGN); | |
526 | } | |
527 | | LESS_LESS WORD | |
528 | { | |
529 | source.dest = 0; | |
530 | redir.filename = $2; | |
531 | $$ = make_redirection (source, r_reading_until, redir, 0); | |
532 | push_heredoc ($$); | |
533 | } | |
534 | | NUMBER LESS_LESS WORD | |
535 | { | |
536 | source.dest = $1; | |
537 | redir.filename = $3; | |
538 | $$ = make_redirection (source, r_reading_until, redir, 0); | |
539 | push_heredoc ($$); | |
540 | } | |
541 | | REDIR_WORD LESS_LESS WORD | |
542 | { | |
543 | source.filename = $1; | |
544 | redir.filename = $3; | |
545 | $$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN); | |
546 | push_heredoc ($$); | |
547 | } | |
548 | | LESS_LESS_MINUS WORD | |
549 | { | |
550 | source.dest = 0; | |
551 | redir.filename = $2; | |
552 | $$ = make_redirection (source, r_deblank_reading_until, redir, 0); | |
553 | push_heredoc ($$); | |
554 | } | |
555 | | NUMBER LESS_LESS_MINUS WORD | |
556 | { | |
557 | source.dest = $1; | |
558 | redir.filename = $3; | |
559 | $$ = make_redirection (source, r_deblank_reading_until, redir, 0); | |
560 | push_heredoc ($$); | |
561 | } | |
562 | | REDIR_WORD LESS_LESS_MINUS WORD | |
563 | { | |
564 | source.filename = $1; | |
565 | redir.filename = $3; | |
566 | $$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN); | |
567 | push_heredoc ($$); | |
568 | } | |
569 | | LESS_LESS_LESS WORD | |
570 | { | |
571 | source.dest = 0; | |
572 | redir.filename = $2; | |
573 | $$ = make_redirection (source, r_reading_string, redir, 0); | |
574 | } | |
575 | | NUMBER LESS_LESS_LESS WORD | |
576 | { | |
577 | source.dest = $1; | |
578 | redir.filename = $3; | |
579 | $$ = make_redirection (source, r_reading_string, redir, 0); | |
580 | } | |
581 | | REDIR_WORD LESS_LESS_LESS WORD | |
582 | { | |
583 | source.filename = $1; | |
584 | redir.filename = $3; | |
585 | $$ = make_redirection (source, r_reading_string, redir, REDIR_VARASSIGN); | |
586 | } | |
587 | | LESS_AND NUMBER | |
588 | { | |
589 | source.dest = 0; | |
590 | redir.dest = $2; | |
591 | $$ = make_redirection (source, r_duplicating_input, redir, 0); | |
592 | } | |
593 | | NUMBER LESS_AND NUMBER | |
594 | { | |
595 | source.dest = $1; | |
596 | redir.dest = $3; | |
597 | $$ = make_redirection (source, r_duplicating_input, redir, 0); | |
598 | } | |
599 | | REDIR_WORD LESS_AND NUMBER | |
600 | { | |
601 | source.filename = $1; | |
602 | redir.dest = $3; | |
603 | $$ = make_redirection (source, r_duplicating_input, redir, REDIR_VARASSIGN); | |
604 | } | |
605 | | GREATER_AND NUMBER | |
606 | { | |
607 | source.dest = 1; | |
608 | redir.dest = $2; | |
609 | $$ = make_redirection (source, r_duplicating_output, redir, 0); | |
610 | } | |
611 | | NUMBER GREATER_AND NUMBER | |
612 | { | |
613 | source.dest = $1; | |
614 | redir.dest = $3; | |
615 | $$ = make_redirection (source, r_duplicating_output, redir, 0); | |
616 | } | |
617 | | REDIR_WORD GREATER_AND NUMBER | |
618 | { | |
619 | source.filename = $1; | |
620 | redir.dest = $3; | |
621 | $$ = make_redirection (source, r_duplicating_output, redir, REDIR_VARASSIGN); | |
622 | } | |
623 | | LESS_AND WORD | |
624 | { | |
625 | source.dest = 0; | |
626 | redir.filename = $2; | |
627 | $$ = make_redirection (source, r_duplicating_input_word, redir, 0); | |
628 | } | |
629 | | NUMBER LESS_AND WORD | |
630 | { | |
631 | source.dest = $1; | |
632 | redir.filename = $3; | |
633 | $$ = make_redirection (source, r_duplicating_input_word, redir, 0); | |
634 | } | |
635 | | REDIR_WORD LESS_AND WORD | |
636 | { | |
637 | source.filename = $1; | |
638 | redir.filename = $3; | |
639 | $$ = make_redirection (source, r_duplicating_input_word, redir, REDIR_VARASSIGN); | |
640 | } | |
641 | | GREATER_AND WORD | |
642 | { | |
643 | source.dest = 1; | |
644 | redir.filename = $2; | |
645 | $$ = make_redirection (source, r_duplicating_output_word, redir, 0); | |
646 | } | |
647 | | NUMBER GREATER_AND WORD | |
648 | { | |
649 | source.dest = $1; | |
650 | redir.filename = $3; | |
651 | $$ = make_redirection (source, r_duplicating_output_word, redir, 0); | |
652 | } | |
653 | | REDIR_WORD GREATER_AND WORD | |
654 | { | |
655 | source.filename = $1; | |
656 | redir.filename = $3; | |
657 | $$ = make_redirection (source, r_duplicating_output_word, redir, REDIR_VARASSIGN); | |
658 | } | |
659 | | GREATER_AND '-' | |
660 | { | |
661 | source.dest = 1; | |
662 | redir.dest = 0; | |
663 | $$ = make_redirection (source, r_close_this, redir, 0); | |
664 | } | |
665 | | NUMBER GREATER_AND '-' | |
666 | { | |
667 | source.dest = $1; | |
668 | redir.dest = 0; | |
669 | $$ = make_redirection (source, r_close_this, redir, 0); | |
670 | } | |
671 | | REDIR_WORD GREATER_AND '-' | |
672 | { | |
673 | source.filename = $1; | |
674 | redir.dest = 0; | |
675 | $$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN); | |
676 | } | |
677 | | LESS_AND '-' | |
678 | { | |
679 | source.dest = 0; | |
680 | redir.dest = 0; | |
681 | $$ = make_redirection (source, r_close_this, redir, 0); | |
682 | } | |
683 | | NUMBER LESS_AND '-' | |
684 | { | |
685 | source.dest = $1; | |
686 | redir.dest = 0; | |
687 | $$ = make_redirection (source, r_close_this, redir, 0); | |
688 | } | |
689 | | REDIR_WORD LESS_AND '-' | |
690 | { | |
691 | source.filename = $1; | |
692 | redir.dest = 0; | |
693 | $$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN); | |
694 | } | |
695 | | AND_GREATER WORD | |
696 | { | |
697 | source.dest = 1; | |
698 | redir.filename = $2; | |
699 | $$ = make_redirection (source, r_err_and_out, redir, 0); | |
700 | } | |
701 | | AND_GREATER_GREATER WORD | |
702 | { | |
703 | source.dest = 1; | |
704 | redir.filename = $2; | |
705 | $$ = make_redirection (source, r_append_err_and_out, redir, 0); | |
706 | } | |
707 | ; | |
708 | ||
709 | simple_command_element: WORD | |
710 | { $$.word = $1; $$.redirect = 0; } | |
711 | | ASSIGNMENT_WORD | |
712 | { $$.word = $1; $$.redirect = 0; } | |
713 | | redirection | |
714 | { $$.redirect = $1; $$.word = 0; } | |
715 | ; | |
716 | ||
717 | redirection_list: redirection | |
718 | { | |
719 | $$ = $1; | |
720 | } | |
721 | | redirection_list redirection | |
722 | { | |
723 | register REDIRECT *t; | |
724 | ||
725 | for (t = $1; t->next; t = t->next) | |
726 | ; | |
727 | t->next = $2; | |
728 | $$ = $1; | |
729 | } | |
730 | ; | |
731 | ||
732 | simple_command: simple_command_element | |
733 | { $$ = make_simple_command ($1, (COMMAND *)NULL); } | |
734 | | simple_command simple_command_element | |
735 | { $$ = make_simple_command ($2, $1); } | |
736 | ; | |
737 | ||
738 | command: simple_command | |
739 | { $$ = clean_simple_command ($1); } | |
740 | | shell_command | |
741 | { $$ = $1; } | |
742 | | shell_command redirection_list | |
743 | { | |
744 | COMMAND *tc; | |
745 | ||
746 | tc = $1; | |
747 | if (tc->redirects) | |
748 | { | |
749 | register REDIRECT *t; | |
750 | for (t = tc->redirects; t->next; t = t->next) | |
751 | ; | |
752 | t->next = $2; | |
753 | } | |
754 | else | |
755 | tc->redirects = $2; | |
756 | $$ = $1; | |
757 | } | |
758 | | function_def | |
759 | { $$ = $1; } | |
760 | | coproc | |
761 | { $$ = $1; } | |
762 | ; | |
763 | ||
764 | shell_command: for_command | |
765 | { $$ = $1; } | |
766 | | case_command | |
767 | { $$ = $1; } | |
768 | | WHILE compound_list DO compound_list DONE | |
769 | { $$ = make_while_command ($2, $4); } | |
770 | | UNTIL compound_list DO compound_list DONE | |
771 | { $$ = make_until_command ($2, $4); } | |
772 | | select_command | |
773 | { $$ = $1; } | |
774 | | if_command | |
775 | { $$ = $1; } | |
776 | | subshell | |
777 | { $$ = $1; } | |
778 | | group_command | |
779 | { $$ = $1; } | |
780 | | arith_command | |
781 | { $$ = $1; } | |
782 | | cond_command | |
783 | { $$ = $1; } | |
784 | | arith_for_command | |
785 | { $$ = $1; } | |
786 | ; | |
787 | ||
788 | for_command: FOR WORD newline_list DO compound_list DONE | |
789 | { | |
790 | $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]); | |
791 | if (word_top > 0) word_top--; | |
792 | } | |
793 | | FOR WORD newline_list '{' compound_list '}' | |
794 | { | |
795 | $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]); | |
796 | if (word_top > 0) word_top--; | |
797 | } | |
798 | | FOR WORD ';' newline_list DO compound_list DONE | |
799 | { | |
800 | $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]); | |
801 | if (word_top > 0) word_top--; | |
802 | } | |
803 | | FOR WORD ';' newline_list '{' compound_list '}' | |
804 | { | |
805 | $$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]); | |
806 | if (word_top > 0) word_top--; | |
807 | } | |
808 | | FOR WORD newline_list IN word_list list_terminator newline_list DO compound_list DONE | |
809 | { | |
810 | $$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]); | |
811 | if (word_top > 0) word_top--; | |
812 | } | |
813 | | FOR WORD newline_list IN word_list list_terminator newline_list '{' compound_list '}' | |
814 | { | |
815 | $$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]); | |
816 | if (word_top > 0) word_top--; | |
817 | } | |
818 | | FOR WORD newline_list IN list_terminator newline_list DO compound_list DONE | |
819 | { | |
820 | $$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]); | |
821 | if (word_top > 0) word_top--; | |
822 | } | |
823 | | FOR WORD newline_list IN list_terminator newline_list '{' compound_list '}' | |
824 | { | |
825 | $$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]); | |
826 | if (word_top > 0) word_top--; | |
827 | } | |
828 | ; | |
829 | ||
830 | arith_for_command: FOR ARITH_FOR_EXPRS list_terminator newline_list DO compound_list DONE | |
831 | { | |
832 | $$ = make_arith_for_command ($2, $6, arith_for_lineno); | |
833 | if (word_top > 0) word_top--; | |
834 | } | |
835 | | FOR ARITH_FOR_EXPRS list_terminator newline_list '{' compound_list '}' | |
836 | { | |
837 | $$ = make_arith_for_command ($2, $6, arith_for_lineno); | |
838 | if (word_top > 0) word_top--; | |
839 | } | |
840 | | FOR ARITH_FOR_EXPRS DO compound_list DONE | |
841 | { | |
842 | $$ = make_arith_for_command ($2, $4, arith_for_lineno); | |
843 | if (word_top > 0) word_top--; | |
844 | } | |
845 | | FOR ARITH_FOR_EXPRS '{' compound_list '}' | |
846 | { | |
847 | $$ = make_arith_for_command ($2, $4, arith_for_lineno); | |
848 | if (word_top > 0) word_top--; | |
849 | } | |
850 | ; | |
851 | ||
852 | select_command: SELECT WORD newline_list DO list DONE | |
853 | { | |
854 | $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]); | |
855 | if (word_top > 0) word_top--; | |
856 | } | |
857 | | SELECT WORD newline_list '{' list '}' | |
858 | { | |
859 | $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]); | |
860 | if (word_top > 0) word_top--; | |
861 | } | |
862 | | SELECT WORD ';' newline_list DO list DONE | |
863 | { | |
864 | $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]); | |
865 | if (word_top > 0) word_top--; | |
866 | } | |
867 | | SELECT WORD ';' newline_list '{' list '}' | |
868 | { | |
869 | $$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]); | |
870 | if (word_top > 0) word_top--; | |
871 | } | |
872 | | SELECT WORD newline_list IN word_list list_terminator newline_list DO list DONE | |
873 | { | |
874 | $$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]); | |
875 | if (word_top > 0) word_top--; | |
876 | } | |
877 | | SELECT WORD newline_list IN word_list list_terminator newline_list '{' list '}' | |
878 | { | |
879 | $$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]); | |
880 | if (word_top > 0) word_top--; | |
881 | } | |
882 | ; | |
883 | ||
884 | case_command: CASE WORD newline_list IN newline_list ESAC | |
885 | { | |
886 | $$ = make_case_command ($2, (PATTERN_LIST *)NULL, word_lineno[word_top]); | |
887 | if (word_top > 0) word_top--; | |
888 | } | |
889 | | CASE WORD newline_list IN case_clause_sequence newline_list ESAC | |
890 | { | |
891 | $$ = make_case_command ($2, $5, word_lineno[word_top]); | |
892 | if (word_top > 0) word_top--; | |
893 | } | |
894 | | CASE WORD newline_list IN case_clause ESAC | |
895 | { | |
896 | $$ = make_case_command ($2, $5, word_lineno[word_top]); | |
897 | if (word_top > 0) word_top--; | |
898 | } | |
899 | ; | |
900 | ||
901 | function_def: WORD '(' ')' newline_list function_body | |
902 | { $$ = make_function_def ($1, $5, function_dstart, function_bstart); } | |
903 | ||
904 | | FUNCTION WORD '(' ')' newline_list function_body | |
905 | { $$ = make_function_def ($2, $6, function_dstart, function_bstart); } | |
906 | ||
907 | | FUNCTION WORD newline_list function_body | |
908 | { $$ = make_function_def ($2, $4, function_dstart, function_bstart); } | |
909 | ; | |
910 | ||
911 | function_body: shell_command | |
912 | { $$ = $1; } | |
913 | | shell_command redirection_list | |
914 | { | |
915 | COMMAND *tc; | |
916 | ||
917 | tc = $1; | |
918 | /* According to Posix.2 3.9.5, redirections | |
919 | specified after the body of a function should | |
920 | be attached to the function and performed when | |
921 | the function is executed, not as part of the | |
922 | function definition command. */ | |
923 | /* XXX - I don't think it matters, but we might | |
924 | want to change this in the future to avoid | |
925 | problems differentiating between a function | |
926 | definition with a redirection and a function | |
927 | definition containing a single command with a | |
928 | redirection. The two are semantically equivalent, | |
929 | though -- the only difference is in how the | |
930 | command printing code displays the redirections. */ | |
931 | if (tc->redirects) | |
932 | { | |
933 | register REDIRECT *t; | |
934 | for (t = tc->redirects; t->next; t = t->next) | |
935 | ; | |
936 | t->next = $2; | |
937 | } | |
938 | else | |
939 | tc->redirects = $2; | |
940 | $$ = $1; | |
941 | } | |
942 | ; | |
943 | ||
944 | subshell: '(' compound_list ')' | |
945 | { | |
946 | $$ = make_subshell_command ($2); | |
947 | $$->flags |= CMD_WANT_SUBSHELL; | |
948 | } | |
949 | ; | |
950 | ||
951 | coproc: COPROC shell_command | |
952 | { | |
953 | $$ = make_coproc_command ("COPROC", $2); | |
954 | $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; | |
955 | } | |
956 | | COPROC shell_command redirection_list | |
957 | { | |
958 | COMMAND *tc; | |
959 | ||
960 | tc = $2; | |
961 | if (tc->redirects) | |
962 | { | |
963 | register REDIRECT *t; | |
964 | for (t = tc->redirects; t->next; t = t->next) | |
965 | ; | |
966 | t->next = $3; | |
967 | } | |
968 | else | |
969 | tc->redirects = $3; | |
970 | $$ = make_coproc_command ("COPROC", $2); | |
971 | $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; | |
972 | } | |
973 | | COPROC WORD shell_command | |
974 | { | |
975 | $$ = make_coproc_command ($2->word, $3); | |
976 | $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; | |
977 | } | |
978 | | COPROC WORD shell_command redirection_list | |
979 | { | |
980 | COMMAND *tc; | |
981 | ||
982 | tc = $3; | |
983 | if (tc->redirects) | |
984 | { | |
985 | register REDIRECT *t; | |
986 | for (t = tc->redirects; t->next; t = t->next) | |
987 | ; | |
988 | t->next = $4; | |
989 | } | |
990 | else | |
991 | tc->redirects = $4; | |
992 | $$ = make_coproc_command ($2->word, $3); | |
993 | $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; | |
994 | } | |
995 | | COPROC simple_command | |
996 | { | |
997 | $$ = make_coproc_command ("COPROC", clean_simple_command ($2)); | |
998 | $$->flags |= CMD_WANT_SUBSHELL|CMD_COPROC_SUBSHELL; | |
999 | } | |
1000 | ; | |
1001 | ||
1002 | if_command: IF compound_list THEN compound_list FI | |
1003 | { $$ = make_if_command ($2, $4, (COMMAND *)NULL); } | |
1004 | | IF compound_list THEN compound_list ELSE compound_list FI | |
1005 | { $$ = make_if_command ($2, $4, $6); } | |
1006 | | IF compound_list THEN compound_list elif_clause FI | |
1007 | { $$ = make_if_command ($2, $4, $5); } | |
1008 | ; | |
1009 | ||
1010 | ||
1011 | group_command: '{' compound_list '}' | |
1012 | { $$ = make_group_command ($2); } | |
1013 | ; | |
1014 | ||
1015 | arith_command: ARITH_CMD | |
1016 | { $$ = make_arith_command ($1); } | |
1017 | ; | |
1018 | ||
1019 | cond_command: COND_START COND_CMD COND_END | |
1020 | { $$ = $2; } | |
1021 | ; | |
1022 | ||
1023 | elif_clause: ELIF compound_list THEN compound_list | |
1024 | { $$ = make_if_command ($2, $4, (COMMAND *)NULL); } | |
1025 | | ELIF compound_list THEN compound_list ELSE compound_list | |
1026 | { $$ = make_if_command ($2, $4, $6); } | |
1027 | | ELIF compound_list THEN compound_list elif_clause | |
1028 | { $$ = make_if_command ($2, $4, $5); } | |
1029 | ; | |
1030 | ||
1031 | case_clause: pattern_list | |
1032 | | case_clause_sequence pattern_list | |
1033 | { $2->next = $1; $$ = $2; } | |
1034 | ; | |
1035 | ||
1036 | pattern_list: newline_list pattern ')' compound_list | |
1037 | { $$ = make_pattern_list ($2, $4); } | |
1038 | | newline_list pattern ')' newline_list | |
1039 | { $$ = make_pattern_list ($2, (COMMAND *)NULL); } | |
1040 | | newline_list '(' pattern ')' compound_list | |
1041 | { $$ = make_pattern_list ($3, $5); } | |
1042 | | newline_list '(' pattern ')' newline_list | |
1043 | { $$ = make_pattern_list ($3, (COMMAND *)NULL); } | |
1044 | ; | |
1045 | ||
1046 | case_clause_sequence: pattern_list SEMI_SEMI | |
1047 | { $$ = $1; } | |
1048 | | case_clause_sequence pattern_list SEMI_SEMI | |
1049 | { $2->next = $1; $$ = $2; } | |
1050 | | pattern_list SEMI_AND | |
1051 | { $1->flags |= CASEPAT_FALLTHROUGH; $$ = $1; } | |
1052 | | case_clause_sequence pattern_list SEMI_AND | |
1053 | { $2->flags |= CASEPAT_FALLTHROUGH; $2->next = $1; $$ = $2; } | |
1054 | | pattern_list SEMI_SEMI_AND | |
1055 | { $1->flags |= CASEPAT_TESTNEXT; $$ = $1; } | |
1056 | | case_clause_sequence pattern_list SEMI_SEMI_AND | |
1057 | { $2->flags |= CASEPAT_TESTNEXT; $2->next = $1; $$ = $2; } | |
1058 | ; | |
1059 | ||
1060 | pattern: WORD | |
1061 | { $$ = make_word_list ($1, (WORD_LIST *)NULL); } | |
1062 | | pattern '|' WORD | |
1063 | { $$ = make_word_list ($3, $1); } | |
1064 | ; | |
1065 | ||
1066 | /* A list allows leading or trailing newlines and | |
1067 | newlines as operators (equivalent to semicolons). | |
1068 | It must end with a newline or semicolon. | |
1069 | Lists are used within commands such as if, for, while. */ | |
1070 | ||
1071 | list: newline_list list0 | |
1072 | { | |
1073 | $$ = $2; | |
1074 | if (need_here_doc) | |
1075 | gather_here_documents (); | |
1076 | } | |
1077 | ; | |
1078 | ||
1079 | compound_list: list | |
1080 | | newline_list list1 | |
1081 | { | |
1082 | $$ = $2; | |
1083 | } | |
1084 | ; | |
1085 | ||
1086 | list0: list1 '\n' newline_list | |
1087 | | list1 '&' newline_list | |
1088 | { | |
1089 | if ($1->type == cm_connection) | |
1090 | $$ = connect_async_list ($1, (COMMAND *)NULL, '&'); | |
1091 | else | |
1092 | $$ = command_connect ($1, (COMMAND *)NULL, '&'); | |
1093 | } | |
1094 | | list1 ';' newline_list | |
1095 | ||
1096 | ; | |
1097 | ||
1098 | list1: list1 AND_AND newline_list list1 | |
1099 | { $$ = command_connect ($1, $4, AND_AND); } | |
1100 | | list1 OR_OR newline_list list1 | |
1101 | { $$ = command_connect ($1, $4, OR_OR); } | |
1102 | | list1 '&' newline_list list1 | |
1103 | { | |
1104 | if ($1->type == cm_connection) | |
1105 | $$ = connect_async_list ($1, $4, '&'); | |
1106 | else | |
1107 | $$ = command_connect ($1, $4, '&'); | |
1108 | } | |
1109 | | list1 ';' newline_list list1 | |
1110 | { $$ = command_connect ($1, $4, ';'); } | |
1111 | | list1 '\n' newline_list list1 | |
1112 | { $$ = command_connect ($1, $4, ';'); } | |
1113 | | pipeline_command | |
1114 | { $$ = $1; } | |
1115 | ; | |
1116 | ||
1117 | simple_list_terminator: '\n' | |
1118 | | yacc_EOF | |
1119 | ; | |
1120 | ||
1121 | list_terminator:'\n' | |
1122 | { $$ = '\n'; } | |
1123 | | ';' | |
1124 | { $$ = ';'; } | |
1125 | | yacc_EOF | |
1126 | { $$ = yacc_EOF; } | |
1127 | ; | |
1128 | ||
1129 | newline_list: | |
1130 | | newline_list '\n' | |
1131 | ; | |
1132 | ||
1133 | /* A simple_list is a list that contains no significant newlines | |
1134 | and no leading or trailing newlines. Newlines are allowed | |
1135 | only following operators, where they are not significant. | |
1136 | ||
1137 | This is what an inputunit consists of. */ | |
1138 | ||
1139 | simple_list: simple_list1 | |
1140 | { | |
1141 | $$ = $1; | |
1142 | if (need_here_doc) | |
1143 | gather_here_documents (); | |
1144 | if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token) | |
1145 | { | |
1146 | global_command = $1; | |
1147 | eof_encountered = 0; | |
1148 | rewind_input_string (); | |
1149 | YYACCEPT; | |
1150 | } | |
1151 | } | |
1152 | | simple_list1 '&' | |
1153 | { | |
1154 | if ($1->type == cm_connection) | |
1155 | $$ = connect_async_list ($1, (COMMAND *)NULL, '&'); | |
1156 | else | |
1157 | $$ = command_connect ($1, (COMMAND *)NULL, '&'); | |
1158 | if (need_here_doc) | |
1159 | gather_here_documents (); | |
1160 | if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token) | |
1161 | { | |
1162 | global_command = $1; | |
1163 | eof_encountered = 0; | |
1164 | rewind_input_string (); | |
1165 | YYACCEPT; | |
1166 | } | |
1167 | } | |
1168 | | simple_list1 ';' | |
1169 | { | |
1170 | $$ = $1; | |
1171 | if (need_here_doc) | |
1172 | gather_here_documents (); | |
1173 | if ((parser_state & PST_CMDSUBST) && current_token == shell_eof_token) | |
1174 | { | |
1175 | global_command = $1; | |
1176 | eof_encountered = 0; | |
1177 | rewind_input_string (); | |
1178 | YYACCEPT; | |
1179 | } | |
1180 | } | |
1181 | ; | |
1182 | ||
1183 | simple_list1: simple_list1 AND_AND newline_list simple_list1 | |
1184 | { $$ = command_connect ($1, $4, AND_AND); } | |
1185 | | simple_list1 OR_OR newline_list simple_list1 | |
1186 | { $$ = command_connect ($1, $4, OR_OR); } | |
1187 | | simple_list1 '&' simple_list1 | |
1188 | { | |
1189 | if ($1->type == cm_connection) | |
1190 | $$ = connect_async_list ($1, $3, '&'); | |
1191 | else | |
1192 | $$ = command_connect ($1, $3, '&'); | |
1193 | } | |
1194 | | simple_list1 ';' simple_list1 | |
1195 | { $$ = command_connect ($1, $3, ';'); } | |
1196 | ||
1197 | | pipeline_command | |
1198 | { $$ = $1; } | |
1199 | ; | |
1200 | ||
1201 | pipeline_command: pipeline | |
1202 | { $$ = $1; } | |
1203 | | BANG pipeline_command | |
1204 | { | |
1205 | if ($2) | |
1206 | $2->flags ^= CMD_INVERT_RETURN; /* toggle */ | |
1207 | $$ = $2; | |
1208 | } | |
1209 | | timespec pipeline_command | |
1210 | { | |
1211 | if ($2) | |
1212 | $2->flags |= $1; | |
1213 | $$ = $2; | |
1214 | } | |
1215 | | timespec list_terminator | |
1216 | { | |
1217 | ELEMENT x; | |
1218 | ||
1219 | /* Boy, this is unclean. `time' by itself can | |
1220 | time a null command. We cheat and push a | |
1221 | newline back if the list_terminator was a newline | |
1222 | to avoid the double-newline problem (one to | |
1223 | terminate this, one to terminate the command) */ | |
1224 | x.word = 0; | |
1225 | x.redirect = 0; | |
1226 | $$ = make_simple_command (x, (COMMAND *)NULL); | |
1227 | $$->flags |= $1; | |
1228 | /* XXX - let's cheat and push a newline back */ | |
1229 | if ($2 == '\n') | |
1230 | token_to_read = '\n'; | |
1231 | else if ($2 == ';') | |
1232 | token_to_read = ';'; | |
1233 | } | |
1234 | | BANG list_terminator | |
1235 | { | |
1236 | ELEMENT x; | |
1237 | ||
1238 | /* This is just as unclean. Posix says that `!' | |
1239 | by itself should be equivalent to `false'. | |
1240 | We cheat and push a | |
1241 | newline back if the list_terminator was a newline | |
1242 | to avoid the double-newline problem (one to | |
1243 | terminate this, one to terminate the command) */ | |
1244 | x.word = 0; | |
1245 | x.redirect = 0; | |
1246 | $$ = make_simple_command (x, (COMMAND *)NULL); | |
1247 | $$->flags |= CMD_INVERT_RETURN; | |
1248 | /* XXX - let's cheat and push a newline back */ | |
1249 | if ($2 == '\n') | |
1250 | token_to_read = '\n'; | |
1251 | if ($2 == ';') | |
1252 | token_to_read = ';'; | |
1253 | } | |
1254 | ; | |
1255 | ||
1256 | pipeline: pipeline '|' newline_list pipeline | |
1257 | { $$ = command_connect ($1, $4, '|'); } | |
1258 | | pipeline BAR_AND newline_list pipeline | |
1259 | { | |
1260 | /* Make cmd1 |& cmd2 equivalent to cmd1 2>&1 | cmd2 */ | |
1261 | COMMAND *tc; | |
1262 | REDIRECTEE rd, sd; | |
1263 | REDIRECT *r; | |
1264 | ||
1265 | tc = $1->type == cm_simple ? (COMMAND *)$1->value.Simple : $1; | |
1266 | sd.dest = 2; | |
1267 | rd.dest = 1; | |
1268 | r = make_redirection (sd, r_duplicating_output, rd, 0); | |
1269 | if (tc->redirects) | |
1270 | { | |
1271 | register REDIRECT *t; | |
1272 | for (t = tc->redirects; t->next; t = t->next) | |
1273 | ; | |
1274 | t->next = r; | |
1275 | } | |
1276 | else | |
1277 | tc->redirects = r; | |
1278 | ||
1279 | $$ = command_connect ($1, $4, '|'); | |
1280 | } | |
1281 | | command | |
1282 | { $$ = $1; } | |
1283 | ; | |
1284 | ||
1285 | timespec: TIME | |
1286 | { $$ = CMD_TIME_PIPELINE; } | |
1287 | | TIME TIMEOPT | |
1288 | { $$ = CMD_TIME_PIPELINE|CMD_TIME_POSIX; } | |
1289 | | TIME TIMEOPT TIMEIGN | |
1290 | { $$ = CMD_TIME_PIPELINE|CMD_TIME_POSIX; } | |
1291 | ; | |
1292 | %% | |
1293 | ||
1294 | /* Initial size to allocate for tokens, and the | |
1295 | amount to grow them by. */ | |
1296 | #define TOKEN_DEFAULT_INITIAL_SIZE 496 | |
1297 | #define TOKEN_DEFAULT_GROW_SIZE 512 | |
1298 | ||
1299 | /* Should we call prompt_again? */ | |
1300 | #define SHOULD_PROMPT() \ | |
1301 | (interactive && (bash_input.type == st_stdin || bash_input.type == st_stream)) | |
1302 | ||
1303 | #if defined (ALIAS) | |
1304 | # define expanding_alias() (pushed_string_list && pushed_string_list->expander) | |
1305 | #else | |
1306 | # define expanding_alias() 0 | |
1307 | #endif | |
1308 | ||
1309 | /* Global var is non-zero when end of file has been reached. */ | |
1310 | int EOF_Reached = 0; | |
1311 | ||
1312 | #ifdef DEBUG | |
1313 | static void | |
1314 | debug_parser (i) | |
1315 | int i; | |
1316 | { | |
1317 | #if YYDEBUG != 0 | |
1318 | yydebug = i; | |
1319 | #endif | |
1320 | } | |
1321 | #endif | |
1322 | ||
1323 | /* yy_getc () returns the next available character from input or EOF. | |
1324 | yy_ungetc (c) makes `c' the next character to read. | |
1325 | init_yy_io (get, unget, type, location) makes the function GET the | |
1326 | installed function for getting the next character, makes UNGET the | |
1327 | installed function for un-getting a character, sets the type of stream | |
1328 | (either string or file) from TYPE, and makes LOCATION point to where | |
1329 | the input is coming from. */ | |
1330 | ||
1331 | /* Unconditionally returns end-of-file. */ | |
1332 | int | |
1333 | return_EOF () | |
1334 | { | |
1335 | return (EOF); | |
1336 | } | |
1337 | ||
1338 | /* Variable containing the current get and unget functions. | |
1339 | See ./input.h for a clearer description. */ | |
1340 | BASH_INPUT bash_input; | |
1341 | ||
1342 | /* Set all of the fields in BASH_INPUT to NULL. Free bash_input.name if it | |
1343 | is non-null, avoiding a memory leak. */ | |
1344 | void | |
1345 | initialize_bash_input () | |
1346 | { | |
1347 | bash_input.type = st_none; | |
1348 | FREE (bash_input.name); | |
1349 | bash_input.name = (char *)NULL; | |
1350 | bash_input.location.file = (FILE *)NULL; | |
1351 | bash_input.location.string = (char *)NULL; | |
1352 | bash_input.getter = (sh_cget_func_t *)NULL; | |
1353 | bash_input.ungetter = (sh_cunget_func_t *)NULL; | |
1354 | } | |
1355 | ||
1356 | /* Set the contents of the current bash input stream from | |
1357 | GET, UNGET, TYPE, NAME, and LOCATION. */ | |
1358 | void | |
1359 | init_yy_io (get, unget, type, name, location) | |
1360 | sh_cget_func_t *get; | |
1361 | sh_cunget_func_t *unget; | |
1362 | enum stream_type type; | |
1363 | const char *name; | |
1364 | INPUT_STREAM location; | |
1365 | { | |
1366 | bash_input.type = type; | |
1367 | FREE (bash_input.name); | |
1368 | bash_input.name = name ? savestring (name) : (char *)NULL; | |
1369 | ||
1370 | /* XXX */ | |
1371 | #if defined (CRAY) | |
1372 | memcpy((char *)&bash_input.location.string, (char *)&location.string, sizeof(location)); | |
1373 | #else | |
1374 | bash_input.location = location; | |
1375 | #endif | |
1376 | bash_input.getter = get; | |
1377 | bash_input.ungetter = unget; | |
1378 | } | |
1379 | ||
1380 | char * | |
1381 | yy_input_name () | |
1382 | { | |
1383 | return (bash_input.name ? bash_input.name : "stdin"); | |
1384 | } | |
1385 | ||
1386 | /* Call this to get the next character of input. */ | |
1387 | static int | |
1388 | yy_getc () | |
1389 | { | |
1390 | return (*(bash_input.getter)) (); | |
1391 | } | |
1392 | ||
1393 | /* Call this to unget C. That is, to make C the next character | |
1394 | to be read. */ | |
1395 | static int | |
1396 | yy_ungetc (c) | |
1397 | int c; | |
1398 | { | |
1399 | return (*(bash_input.ungetter)) (c); | |
1400 | } | |
1401 | ||
1402 | #if defined (BUFFERED_INPUT) | |
1403 | #ifdef INCLUDE_UNUSED | |
1404 | int | |
1405 | input_file_descriptor () | |
1406 | { | |
1407 | switch (bash_input.type) | |
1408 | { | |
1409 | case st_stream: | |
1410 | return (fileno (bash_input.location.file)); | |
1411 | case st_bstream: | |
1412 | return (bash_input.location.buffered_fd); | |
1413 | case st_stdin: | |
1414 | default: | |
1415 | return (fileno (stdin)); | |
1416 | } | |
1417 | } | |
1418 | #endif | |
1419 | #endif /* BUFFERED_INPUT */ | |
1420 | ||
1421 | /* **************************************************************** */ | |
1422 | /* */ | |
1423 | /* Let input be read from readline (). */ | |
1424 | /* */ | |
1425 | /* **************************************************************** */ | |
1426 | ||
1427 | #if defined (READLINE) | |
1428 | char *current_readline_prompt = (char *)NULL; | |
1429 | char *current_readline_line = (char *)NULL; | |
1430 | int current_readline_line_index = 0; | |
1431 | ||
1432 | static int | |
1433 | yy_readline_get () | |
1434 | { | |
1435 | SigHandler *old_sigint; | |
1436 | int line_len; | |
1437 | unsigned char c; | |
1438 | ||
1439 | if (current_readline_line == 0) | |
1440 | { | |
1441 | if (bash_readline_initialized == 0) | |
1442 | initialize_readline (); | |
1443 | ||
1444 | #if defined (JOB_CONTROL) | |
1445 | if (job_control) | |
1446 | give_terminal_to (shell_pgrp, 0); | |
1447 | #endif /* JOB_CONTROL */ | |
1448 | ||
1449 | old_sigint = IMPOSSIBLE_TRAP_HANDLER; | |
1450 | if (signal_is_ignored (SIGINT) == 0) | |
1451 | { | |
1452 | /* interrupt_immediately++; */ | |
1453 | old_sigint = (SigHandler *)set_signal_handler (SIGINT, sigint_sighandler); | |
1454 | } | |
1455 | ||
1456 | current_readline_line = readline (current_readline_prompt ? | |
1457 | current_readline_prompt : ""); | |
1458 | ||
1459 | CHECK_TERMSIG; | |
1460 | if (signal_is_ignored (SIGINT) == 0) | |
1461 | { | |
1462 | /* interrupt_immediately--; */ | |
1463 | if (old_sigint != IMPOSSIBLE_TRAP_HANDLER) | |
1464 | set_signal_handler (SIGINT, old_sigint); | |
1465 | } | |
1466 | ||
1467 | #if 0 | |
1468 | /* Reset the prompt to the decoded value of prompt_string_pointer. */ | |
1469 | reset_readline_prompt (); | |
1470 | #endif | |
1471 | ||
1472 | if (current_readline_line == 0) | |
1473 | return (EOF); | |
1474 | ||
1475 | current_readline_line_index = 0; | |
1476 | line_len = strlen (current_readline_line); | |
1477 | ||
1478 | current_readline_line = (char *)xrealloc (current_readline_line, 2 + line_len); | |
1479 | current_readline_line[line_len++] = '\n'; | |
1480 | current_readline_line[line_len] = '\0'; | |
1481 | } | |
1482 | ||
1483 | if (current_readline_line[current_readline_line_index] == 0) | |
1484 | { | |
1485 | free (current_readline_line); | |
1486 | current_readline_line = (char *)NULL; | |
1487 | return (yy_readline_get ()); | |
1488 | } | |
1489 | else | |
1490 | { | |
1491 | c = current_readline_line[current_readline_line_index++]; | |
1492 | return (c); | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | static int | |
1497 | yy_readline_unget (c) | |
1498 | int c; | |
1499 | { | |
1500 | if (current_readline_line_index && current_readline_line) | |
1501 | current_readline_line[--current_readline_line_index] = c; | |
1502 | return (c); | |
1503 | } | |
1504 | ||
1505 | void | |
1506 | with_input_from_stdin () | |
1507 | { | |
1508 | INPUT_STREAM location; | |
1509 | ||
1510 | if (bash_input.type != st_stdin && stream_on_stack (st_stdin) == 0) | |
1511 | { | |
1512 | location.string = current_readline_line; | |
1513 | init_yy_io (yy_readline_get, yy_readline_unget, | |
1514 | st_stdin, "readline stdin", location); | |
1515 | } | |
1516 | } | |
1517 | ||
1518 | #else /* !READLINE */ | |
1519 | ||
1520 | void | |
1521 | with_input_from_stdin () | |
1522 | { | |
1523 | with_input_from_stream (stdin, "stdin"); | |
1524 | } | |
1525 | #endif /* !READLINE */ | |
1526 | ||
1527 | /* **************************************************************** */ | |
1528 | /* */ | |
1529 | /* Let input come from STRING. STRING is zero terminated. */ | |
1530 | /* */ | |
1531 | /* **************************************************************** */ | |
1532 | ||
1533 | static int | |
1534 | yy_string_get () | |
1535 | { | |
1536 | register char *string; | |
1537 | register unsigned char c; | |
1538 | ||
1539 | string = bash_input.location.string; | |
1540 | ||
1541 | /* If the string doesn't exist, or is empty, EOF found. */ | |
1542 | if (string && *string) | |
1543 | { | |
1544 | c = *string++; | |
1545 | bash_input.location.string = string; | |
1546 | return (c); | |
1547 | } | |
1548 | else | |
1549 | return (EOF); | |
1550 | } | |
1551 | ||
1552 | static int | |
1553 | yy_string_unget (c) | |
1554 | int c; | |
1555 | { | |
1556 | *(--bash_input.location.string) = c; | |
1557 | return (c); | |
1558 | } | |
1559 | ||
1560 | void | |
1561 | with_input_from_string (string, name) | |
1562 | char *string; | |
1563 | const char *name; | |
1564 | { | |
1565 | INPUT_STREAM location; | |
1566 | ||
1567 | location.string = string; | |
1568 | init_yy_io (yy_string_get, yy_string_unget, st_string, name, location); | |
1569 | } | |
1570 | ||
1571 | /* Count the number of characters we've consumed from bash_input.location.string | |
1572 | and read into shell_input_line, but have not returned from shell_getc. | |
1573 | That is the true input location. Rewind bash_input.location.string by | |
1574 | that number of characters, so it points to the last character actually | |
1575 | consumed by the parser. */ | |
1576 | static void | |
1577 | rewind_input_string () | |
1578 | { | |
1579 | int xchars; | |
1580 | ||
1581 | /* number of unconsumed characters in the input -- XXX need to take newlines | |
1582 | into account, e.g., $(...\n) */ | |
1583 | xchars = shell_input_line_len - shell_input_line_index; | |
1584 | if (bash_input.location.string[-1] == '\n') | |
1585 | xchars++; | |
1586 | ||
1587 | /* XXX - how to reflect bash_input.location.string back to string passed to | |
1588 | parse_and_execute or xparse_dolparen? xparse_dolparen needs to know how | |
1589 | far into the string we parsed. parse_and_execute knows where bash_input. | |
1590 | location.string is, and how far from orig_string that is -- that's the | |
1591 | number of characters the command consumed. */ | |
1592 | ||
1593 | /* bash_input.location.string - xchars should be where we parsed to */ | |
1594 | /* need to do more validation on xchars value for sanity -- test cases. */ | |
1595 | bash_input.location.string -= xchars; | |
1596 | } | |
1597 | ||
1598 | /* **************************************************************** */ | |
1599 | /* */ | |
1600 | /* Let input come from STREAM. */ | |
1601 | /* */ | |
1602 | /* **************************************************************** */ | |
1603 | ||
1604 | /* These two functions used to test the value of the HAVE_RESTARTABLE_SYSCALLS | |
1605 | define, and just use getc/ungetc if it was defined, but since bash | |
1606 | installs its signal handlers without the SA_RESTART flag, some signals | |
1607 | (like SIGCHLD, SIGWINCH, etc.) received during a read(2) will not cause | |
1608 | the read to be restarted. We need to restart it ourselves. */ | |
1609 | ||
1610 | static int | |
1611 | yy_stream_get () | |
1612 | { | |
1613 | int result; | |
1614 | ||
1615 | result = EOF; | |
1616 | if (bash_input.location.file) | |
1617 | { | |
1618 | #if 0 | |
1619 | if (interactive) | |
1620 | interrupt_immediately++; | |
1621 | #endif | |
1622 | ||
1623 | /* XXX - don't need terminate_immediately; getc_with_restart checks | |
1624 | for terminating signals itself if read returns < 0 */ | |
1625 | result = getc_with_restart (bash_input.location.file); | |
1626 | ||
1627 | #if 0 | |
1628 | if (interactive) | |
1629 | interrupt_immediately--; | |
1630 | #endif | |
1631 | } | |
1632 | return (result); | |
1633 | } | |
1634 | ||
1635 | static int | |
1636 | yy_stream_unget (c) | |
1637 | int c; | |
1638 | { | |
1639 | return (ungetc_with_restart (c, bash_input.location.file)); | |
1640 | } | |
1641 | ||
1642 | void | |
1643 | with_input_from_stream (stream, name) | |
1644 | FILE *stream; | |
1645 | const char *name; | |
1646 | { | |
1647 | INPUT_STREAM location; | |
1648 | ||
1649 | location.file = stream; | |
1650 | init_yy_io (yy_stream_get, yy_stream_unget, st_stream, name, location); | |
1651 | } | |
1652 | ||
1653 | typedef struct stream_saver { | |
1654 | struct stream_saver *next; | |
1655 | BASH_INPUT bash_input; | |
1656 | int line; | |
1657 | #if defined (BUFFERED_INPUT) | |
1658 | BUFFERED_STREAM *bstream; | |
1659 | #endif /* BUFFERED_INPUT */ | |
1660 | } STREAM_SAVER; | |
1661 | ||
1662 | /* The globally known line number. */ | |
1663 | int line_number = 0; | |
1664 | ||
1665 | /* The line number offset set by assigning to LINENO. Not currently used. */ | |
1666 | int line_number_base = 0; | |
1667 | ||
1668 | #if defined (COND_COMMAND) | |
1669 | static int cond_lineno; | |
1670 | static int cond_token; | |
1671 | #endif | |
1672 | ||
1673 | STREAM_SAVER *stream_list = (STREAM_SAVER *)NULL; | |
1674 | ||
1675 | void | |
1676 | push_stream (reset_lineno) | |
1677 | int reset_lineno; | |
1678 | { | |
1679 | STREAM_SAVER *saver = (STREAM_SAVER *)xmalloc (sizeof (STREAM_SAVER)); | |
1680 | ||
1681 | xbcopy ((char *)&bash_input, (char *)&(saver->bash_input), sizeof (BASH_INPUT)); | |
1682 | ||
1683 | #if defined (BUFFERED_INPUT) | |
1684 | saver->bstream = (BUFFERED_STREAM *)NULL; | |
1685 | /* If we have a buffered stream, clear out buffers[fd]. */ | |
1686 | if (bash_input.type == st_bstream && bash_input.location.buffered_fd >= 0) | |
1687 | saver->bstream = set_buffered_stream (bash_input.location.buffered_fd, | |
1688 | (BUFFERED_STREAM *)NULL); | |
1689 | #endif /* BUFFERED_INPUT */ | |
1690 | ||
1691 | saver->line = line_number; | |
1692 | bash_input.name = (char *)NULL; | |
1693 | saver->next = stream_list; | |
1694 | stream_list = saver; | |
1695 | EOF_Reached = 0; | |
1696 | if (reset_lineno) | |
1697 | line_number = 0; | |
1698 | } | |
1699 | ||
1700 | void | |
1701 | pop_stream () | |
1702 | { | |
1703 | if (!stream_list) | |
1704 | EOF_Reached = 1; | |
1705 | else | |
1706 | { | |
1707 | STREAM_SAVER *saver = stream_list; | |
1708 | ||
1709 | EOF_Reached = 0; | |
1710 | stream_list = stream_list->next; | |
1711 | ||
1712 | init_yy_io (saver->bash_input.getter, | |
1713 | saver->bash_input.ungetter, | |
1714 | saver->bash_input.type, | |
1715 | saver->bash_input.name, | |
1716 | saver->bash_input.location); | |
1717 | ||
1718 | #if defined (BUFFERED_INPUT) | |
1719 | /* If we have a buffered stream, restore buffers[fd]. */ | |
1720 | /* If the input file descriptor was changed while this was on the | |
1721 | save stack, update the buffered fd to the new file descriptor and | |
1722 | re-establish the buffer <-> bash_input fd correspondence. */ | |
1723 | if (bash_input.type == st_bstream && bash_input.location.buffered_fd >= 0) | |
1724 | { | |
1725 | if (bash_input_fd_changed) | |
1726 | { | |
1727 | bash_input_fd_changed = 0; | |
1728 | if (default_buffered_input >= 0) | |
1729 | { | |
1730 | bash_input.location.buffered_fd = default_buffered_input; | |
1731 | saver->bstream->b_fd = default_buffered_input; | |
1732 | SET_CLOSE_ON_EXEC (default_buffered_input); | |
1733 | } | |
1734 | } | |
1735 | /* XXX could free buffered stream returned as result here. */ | |
1736 | set_buffered_stream (bash_input.location.buffered_fd, saver->bstream); | |
1737 | } | |
1738 | #endif /* BUFFERED_INPUT */ | |
1739 | ||
1740 | line_number = saver->line; | |
1741 | ||
1742 | FREE (saver->bash_input.name); | |
1743 | free (saver); | |
1744 | } | |
1745 | } | |
1746 | ||
1747 | /* Return 1 if a stream of type TYPE is saved on the stack. */ | |
1748 | int | |
1749 | stream_on_stack (type) | |
1750 | enum stream_type type; | |
1751 | { | |
1752 | register STREAM_SAVER *s; | |
1753 | ||
1754 | for (s = stream_list; s; s = s->next) | |
1755 | if (s->bash_input.type == type) | |
1756 | return 1; | |
1757 | return 0; | |
1758 | } | |
1759 | ||
1760 | /* Save the current token state and return it in a malloced array. */ | |
1761 | int * | |
1762 | save_token_state () | |
1763 | { | |
1764 | int *ret; | |
1765 | ||
1766 | ret = (int *)xmalloc (4 * sizeof (int)); | |
1767 | ret[0] = last_read_token; | |
1768 | ret[1] = token_before_that; | |
1769 | ret[2] = two_tokens_ago; | |
1770 | ret[3] = current_token; | |
1771 | return ret; | |
1772 | } | |
1773 | ||
1774 | void | |
1775 | restore_token_state (ts) | |
1776 | int *ts; | |
1777 | { | |
1778 | if (ts == 0) | |
1779 | return; | |
1780 | last_read_token = ts[0]; | |
1781 | token_before_that = ts[1]; | |
1782 | two_tokens_ago = ts[2]; | |
1783 | current_token = ts[3]; | |
1784 | } | |
1785 | ||
1786 | /* | |
1787 | * This is used to inhibit alias expansion and reserved word recognition | |
1788 | * inside case statement pattern lists. A `case statement pattern list' is: | |
1789 | * | |
1790 | * everything between the `in' in a `case word in' and the next ')' | |
1791 | * or `esac' | |
1792 | * everything between a `;;' and the next `)' or `esac' | |
1793 | */ | |
1794 | ||
1795 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
1796 | ||
1797 | #define END_OF_ALIAS 0 | |
1798 | ||
1799 | /* | |
1800 | * Pseudo-global variables used in implementing token-wise alias expansion. | |
1801 | */ | |
1802 | ||
1803 | /* | |
1804 | * Pushing and popping strings. This works together with shell_getc to | |
1805 | * implement alias expansion on a per-token basis. | |
1806 | */ | |
1807 | ||
1808 | #define PSH_ALIAS 0x01 | |
1809 | #define PSH_DPAREN 0x02 | |
1810 | #define PSH_SOURCE 0x04 | |
1811 | ||
1812 | typedef struct string_saver { | |
1813 | struct string_saver *next; | |
1814 | int expand_alias; /* Value to set expand_alias to when string is popped. */ | |
1815 | char *saved_line; | |
1816 | #if defined (ALIAS) | |
1817 | alias_t *expander; /* alias that caused this line to be pushed. */ | |
1818 | #endif | |
1819 | size_t saved_line_size, saved_line_index; | |
1820 | int saved_line_terminator; | |
1821 | int flags; | |
1822 | } STRING_SAVER; | |
1823 | ||
1824 | STRING_SAVER *pushed_string_list = (STRING_SAVER *)NULL; | |
1825 | ||
1826 | /* | |
1827 | * Push the current shell_input_line onto a stack of such lines and make S | |
1828 | * the current input. Used when expanding aliases. EXPAND is used to set | |
1829 | * the value of expand_next_token when the string is popped, so that the | |
1830 | * word after the alias in the original line is handled correctly when the | |
1831 | * alias expands to multiple words. TOKEN is the token that was expanded | |
1832 | * into S; it is saved and used to prevent infinite recursive expansion. | |
1833 | */ | |
1834 | static void | |
1835 | push_string (s, expand, ap) | |
1836 | char *s; | |
1837 | int expand; | |
1838 | alias_t *ap; | |
1839 | { | |
1840 | STRING_SAVER *temp = (STRING_SAVER *)xmalloc (sizeof (STRING_SAVER)); | |
1841 | ||
1842 | temp->expand_alias = expand; | |
1843 | temp->saved_line = shell_input_line; | |
1844 | temp->saved_line_size = shell_input_line_size; | |
1845 | temp->saved_line_index = shell_input_line_index; | |
1846 | temp->saved_line_terminator = shell_input_line_terminator; | |
1847 | temp->flags = 0; | |
1848 | #if defined (ALIAS) | |
1849 | temp->expander = ap; | |
1850 | if (ap) | |
1851 | temp->flags = PSH_ALIAS; | |
1852 | #endif | |
1853 | temp->next = pushed_string_list; | |
1854 | pushed_string_list = temp; | |
1855 | ||
1856 | #if defined (ALIAS) | |
1857 | if (ap) | |
1858 | ap->flags |= AL_BEINGEXPANDED; | |
1859 | #endif | |
1860 | ||
1861 | shell_input_line = s; | |
1862 | shell_input_line_size = STRLEN (s); | |
1863 | shell_input_line_index = 0; | |
1864 | shell_input_line_terminator = '\0'; | |
1865 | #if 0 | |
1866 | parser_state &= ~PST_ALEXPNEXT; /* XXX */ | |
1867 | #endif | |
1868 | ||
1869 | set_line_mbstate (); | |
1870 | } | |
1871 | ||
1872 | /* | |
1873 | * Make the top of the pushed_string stack be the current shell input. | |
1874 | * Only called when there is something on the stack. Called from shell_getc | |
1875 | * when it thinks it has consumed the string generated by an alias expansion | |
1876 | * and needs to return to the original input line. | |
1877 | */ | |
1878 | static void | |
1879 | pop_string () | |
1880 | { | |
1881 | STRING_SAVER *t; | |
1882 | ||
1883 | FREE (shell_input_line); | |
1884 | shell_input_line = pushed_string_list->saved_line; | |
1885 | shell_input_line_index = pushed_string_list->saved_line_index; | |
1886 | shell_input_line_size = pushed_string_list->saved_line_size; | |
1887 | shell_input_line_terminator = pushed_string_list->saved_line_terminator; | |
1888 | ||
1889 | if (pushed_string_list->expand_alias) | |
1890 | parser_state |= PST_ALEXPNEXT; | |
1891 | else | |
1892 | parser_state &= ~PST_ALEXPNEXT; | |
1893 | ||
1894 | t = pushed_string_list; | |
1895 | pushed_string_list = pushed_string_list->next; | |
1896 | ||
1897 | #if defined (ALIAS) | |
1898 | if (t->expander) | |
1899 | t->expander->flags &= ~AL_BEINGEXPANDED; | |
1900 | #endif | |
1901 | ||
1902 | free ((char *)t); | |
1903 | ||
1904 | set_line_mbstate (); | |
1905 | } | |
1906 | ||
1907 | static void | |
1908 | free_string_list () | |
1909 | { | |
1910 | register STRING_SAVER *t, *t1; | |
1911 | ||
1912 | for (t = pushed_string_list; t; ) | |
1913 | { | |
1914 | t1 = t->next; | |
1915 | FREE (t->saved_line); | |
1916 | #if defined (ALIAS) | |
1917 | if (t->expander) | |
1918 | t->expander->flags &= ~AL_BEINGEXPANDED; | |
1919 | #endif | |
1920 | free ((char *)t); | |
1921 | t = t1; | |
1922 | } | |
1923 | pushed_string_list = (STRING_SAVER *)NULL; | |
1924 | } | |
1925 | ||
1926 | #endif /* ALIAS || DPAREN_ARITHMETIC */ | |
1927 | ||
1928 | void | |
1929 | free_pushed_string_input () | |
1930 | { | |
1931 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
1932 | free_string_list (); | |
1933 | #endif | |
1934 | } | |
1935 | ||
1936 | int | |
1937 | parser_expanding_alias () | |
1938 | { | |
1939 | return (expanding_alias ()); | |
1940 | } | |
1941 | ||
1942 | void | |
1943 | parser_save_alias () | |
1944 | { | |
1945 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
1946 | push_string ((char *)NULL, 0, (alias_t *)NULL); | |
1947 | pushed_string_list->flags = PSH_SOURCE; /* XXX - for now */ | |
1948 | #else | |
1949 | ; | |
1950 | #endif | |
1951 | } | |
1952 | ||
1953 | void | |
1954 | parser_restore_alias () | |
1955 | { | |
1956 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
1957 | if (pushed_string_list) | |
1958 | pop_string (); | |
1959 | #else | |
1960 | ; | |
1961 | #endif | |
1962 | } | |
1963 | ||
1964 | void | |
1965 | clear_shell_input_line () | |
1966 | { | |
1967 | if (shell_input_line) | |
1968 | shell_input_line[shell_input_line_index = 0] = '\0'; | |
1969 | } | |
1970 | ||
1971 | /* Return a line of text, taken from wherever yylex () reads input. | |
1972 | If there is no more input, then we return NULL. If REMOVE_QUOTED_NEWLINE | |
1973 | is non-zero, we remove unquoted \<newline> pairs. This is used by | |
1974 | read_secondary_line to read here documents. */ | |
1975 | static char * | |
1976 | read_a_line (remove_quoted_newline) | |
1977 | int remove_quoted_newline; | |
1978 | { | |
1979 | static char *line_buffer = (char *)NULL; | |
1980 | static int buffer_size = 0; | |
1981 | int indx, c, peekc, pass_next; | |
1982 | ||
1983 | #if defined (READLINE) | |
1984 | if (no_line_editing && SHOULD_PROMPT ()) | |
1985 | #else | |
1986 | if (SHOULD_PROMPT ()) | |
1987 | #endif | |
1988 | print_prompt (); | |
1989 | ||
1990 | pass_next = indx = 0; | |
1991 | while (1) | |
1992 | { | |
1993 | /* Allow immediate exit if interrupted during input. */ | |
1994 | QUIT; | |
1995 | ||
1996 | c = yy_getc (); | |
1997 | ||
1998 | /* Ignore null bytes in input. */ | |
1999 | if (c == 0) | |
2000 | { | |
2001 | #if 0 | |
2002 | internal_warning ("read_a_line: ignored null byte in input"); | |
2003 | #endif | |
2004 | continue; | |
2005 | } | |
2006 | ||
2007 | /* If there is no more input, then we return NULL. */ | |
2008 | if (c == EOF) | |
2009 | { | |
2010 | if (interactive && bash_input.type == st_stream) | |
2011 | clearerr (stdin); | |
2012 | if (indx == 0) | |
2013 | return ((char *)NULL); | |
2014 | c = '\n'; | |
2015 | } | |
2016 | ||
2017 | /* `+2' in case the final character in the buffer is a newline. */ | |
2018 | RESIZE_MALLOCED_BUFFER (line_buffer, indx, 2, buffer_size, 128); | |
2019 | ||
2020 | /* IF REMOVE_QUOTED_NEWLINES is non-zero, we are reading a | |
2021 | here document with an unquoted delimiter. In this case, | |
2022 | the line will be expanded as if it were in double quotes. | |
2023 | We allow a backslash to escape the next character, but we | |
2024 | need to treat the backslash specially only if a backslash | |
2025 | quoting a backslash-newline pair appears in the line. */ | |
2026 | if (pass_next) | |
2027 | { | |
2028 | line_buffer[indx++] = c; | |
2029 | pass_next = 0; | |
2030 | } | |
2031 | else if (c == '\\' && remove_quoted_newline) | |
2032 | { | |
2033 | QUIT; | |
2034 | peekc = yy_getc (); | |
2035 | if (peekc == '\n') | |
2036 | { | |
2037 | line_number++; | |
2038 | continue; /* Make the unquoted \<newline> pair disappear. */ | |
2039 | } | |
2040 | else | |
2041 | { | |
2042 | yy_ungetc (peekc); | |
2043 | pass_next = 1; | |
2044 | line_buffer[indx++] = c; /* Preserve the backslash. */ | |
2045 | } | |
2046 | } | |
2047 | else | |
2048 | line_buffer[indx++] = c; | |
2049 | ||
2050 | if (c == '\n') | |
2051 | { | |
2052 | line_buffer[indx] = '\0'; | |
2053 | return (line_buffer); | |
2054 | } | |
2055 | } | |
2056 | } | |
2057 | ||
2058 | /* Return a line as in read_a_line (), but insure that the prompt is | |
2059 | the secondary prompt. This is used to read the lines of a here | |
2060 | document. REMOVE_QUOTED_NEWLINE is non-zero if we should remove | |
2061 | newlines quoted with backslashes while reading the line. It is | |
2062 | non-zero unless the delimiter of the here document was quoted. */ | |
2063 | char * | |
2064 | read_secondary_line (remove_quoted_newline) | |
2065 | int remove_quoted_newline; | |
2066 | { | |
2067 | char *ret; | |
2068 | int n, c; | |
2069 | ||
2070 | prompt_string_pointer = &ps2_prompt; | |
2071 | if (SHOULD_PROMPT()) | |
2072 | prompt_again (); | |
2073 | ret = read_a_line (remove_quoted_newline); | |
2074 | #if defined (HISTORY) | |
2075 | if (ret && remember_on_history && (parser_state & PST_HEREDOC)) | |
2076 | { | |
2077 | /* To make adding the here-document body right, we need to rely on | |
2078 | history_delimiting_chars() returning \n for the first line of the | |
2079 | here-document body and the null string for the second and subsequent | |
2080 | lines, so we avoid double newlines. | |
2081 | current_command_line_count == 2 for the first line of the body. */ | |
2082 | ||
2083 | current_command_line_count++; | |
2084 | maybe_add_history (ret); | |
2085 | } | |
2086 | #endif /* HISTORY */ | |
2087 | return ret; | |
2088 | } | |
2089 | ||
2090 | /* **************************************************************** */ | |
2091 | /* */ | |
2092 | /* YYLEX () */ | |
2093 | /* */ | |
2094 | /* **************************************************************** */ | |
2095 | ||
2096 | /* Reserved words. These are only recognized as the first word of a | |
2097 | command. */ | |
2098 | STRING_INT_ALIST word_token_alist[] = { | |
2099 | { "if", IF }, | |
2100 | { "then", THEN }, | |
2101 | { "else", ELSE }, | |
2102 | { "elif", ELIF }, | |
2103 | { "fi", FI }, | |
2104 | { "case", CASE }, | |
2105 | { "esac", ESAC }, | |
2106 | { "for", FOR }, | |
2107 | #if defined (SELECT_COMMAND) | |
2108 | { "select", SELECT }, | |
2109 | #endif | |
2110 | { "while", WHILE }, | |
2111 | { "until", UNTIL }, | |
2112 | { "do", DO }, | |
2113 | { "done", DONE }, | |
2114 | { "in", IN }, | |
2115 | { "function", FUNCTION }, | |
2116 | #if defined (COMMAND_TIMING) | |
2117 | { "time", TIME }, | |
2118 | #endif | |
2119 | { "{", '{' }, | |
2120 | { "}", '}' }, | |
2121 | { "!", BANG }, | |
2122 | #if defined (COND_COMMAND) | |
2123 | { "[[", COND_START }, | |
2124 | { "]]", COND_END }, | |
2125 | #endif | |
2126 | #if defined (COPROCESS_SUPPORT) | |
2127 | { "coproc", COPROC }, | |
2128 | #endif | |
2129 | { (char *)NULL, 0} | |
2130 | }; | |
2131 | ||
2132 | /* other tokens that can be returned by read_token() */ | |
2133 | STRING_INT_ALIST other_token_alist[] = { | |
2134 | /* Multiple-character tokens with special values */ | |
2135 | { "--", TIMEIGN }, | |
2136 | { "-p", TIMEOPT }, | |
2137 | { "&&", AND_AND }, | |
2138 | { "||", OR_OR }, | |
2139 | { ">>", GREATER_GREATER }, | |
2140 | { "<<", LESS_LESS }, | |
2141 | { "<&", LESS_AND }, | |
2142 | { ">&", GREATER_AND }, | |
2143 | { ";;", SEMI_SEMI }, | |
2144 | { ";&", SEMI_AND }, | |
2145 | { ";;&", SEMI_SEMI_AND }, | |
2146 | { "<<-", LESS_LESS_MINUS }, | |
2147 | { "<<<", LESS_LESS_LESS }, | |
2148 | { "&>", AND_GREATER }, | |
2149 | { "&>>", AND_GREATER_GREATER }, | |
2150 | { "<>", LESS_GREATER }, | |
2151 | { ">|", GREATER_BAR }, | |
2152 | { "|&", BAR_AND }, | |
2153 | { "EOF", yacc_EOF }, | |
2154 | /* Tokens whose value is the character itself */ | |
2155 | { ">", '>' }, | |
2156 | { "<", '<' }, | |
2157 | { "-", '-' }, | |
2158 | { "{", '{' }, | |
2159 | { "}", '}' }, | |
2160 | { ";", ';' }, | |
2161 | { "(", '(' }, | |
2162 | { ")", ')' }, | |
2163 | { "|", '|' }, | |
2164 | { "&", '&' }, | |
2165 | { "newline", '\n' }, | |
2166 | { (char *)NULL, 0} | |
2167 | }; | |
2168 | ||
2169 | /* others not listed here: | |
2170 | WORD look at yylval.word | |
2171 | ASSIGNMENT_WORD look at yylval.word | |
2172 | NUMBER look at yylval.number | |
2173 | ARITH_CMD look at yylval.word_list | |
2174 | ARITH_FOR_EXPRS look at yylval.word_list | |
2175 | COND_CMD look at yylval.command | |
2176 | */ | |
2177 | ||
2178 | /* These are used by read_token_word, but appear up here so that shell_getc | |
2179 | can use them to decide when to add otherwise blank lines to the history. */ | |
2180 | ||
2181 | /* The primary delimiter stack. */ | |
2182 | struct dstack dstack = { (char *)NULL, 0, 0 }; | |
2183 | ||
2184 | /* A temporary delimiter stack to be used when decoding prompt strings. | |
2185 | This is needed because command substitutions in prompt strings (e.g., PS2) | |
2186 | can screw up the parser's quoting state. */ | |
2187 | static struct dstack temp_dstack = { (char *)NULL, 0, 0 }; | |
2188 | ||
2189 | /* Macro for accessing the top delimiter on the stack. Returns the | |
2190 | delimiter or zero if none. */ | |
2191 | #define current_delimiter(ds) \ | |
2192 | (ds.delimiter_depth ? ds.delimiters[ds.delimiter_depth - 1] : 0) | |
2193 | ||
2194 | #define push_delimiter(ds, character) \ | |
2195 | do \ | |
2196 | { \ | |
2197 | if (ds.delimiter_depth + 2 > ds.delimiter_space) \ | |
2198 | ds.delimiters = (char *)xrealloc \ | |
2199 | (ds.delimiters, (ds.delimiter_space += 10) * sizeof (char)); \ | |
2200 | ds.delimiters[ds.delimiter_depth] = character; \ | |
2201 | ds.delimiter_depth++; \ | |
2202 | } \ | |
2203 | while (0) | |
2204 | ||
2205 | #define pop_delimiter(ds) ds.delimiter_depth-- | |
2206 | ||
2207 | /* Return the next shell input character. This always reads characters | |
2208 | from shell_input_line; when that line is exhausted, it is time to | |
2209 | read the next line. This is called by read_token when the shell is | |
2210 | processing normal command input. */ | |
2211 | ||
2212 | /* This implements one-character lookahead/lookbehind across physical input | |
2213 | lines, to avoid something being lost because it's pushed back with | |
2214 | shell_ungetc when we're at the start of a line. */ | |
2215 | static int eol_ungetc_lookahead = 0; | |
2216 | ||
2217 | static int | |
2218 | shell_getc (remove_quoted_newline) | |
2219 | int remove_quoted_newline; | |
2220 | { | |
2221 | register int i; | |
2222 | int c, truncating, last_was_backslash; | |
2223 | unsigned char uc; | |
2224 | ||
2225 | QUIT; | |
2226 | ||
2227 | last_was_backslash = 0; | |
2228 | if (sigwinch_received) | |
2229 | { | |
2230 | sigwinch_received = 0; | |
2231 | get_new_window_size (0, (int *)0, (int *)0); | |
2232 | } | |
2233 | ||
2234 | if (eol_ungetc_lookahead) | |
2235 | { | |
2236 | c = eol_ungetc_lookahead; | |
2237 | eol_ungetc_lookahead = 0; | |
2238 | return (c); | |
2239 | } | |
2240 | ||
2241 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
2242 | /* If shell_input_line[shell_input_line_index] == 0, but there is | |
2243 | something on the pushed list of strings, then we don't want to go | |
2244 | off and get another line. We let the code down below handle it. */ | |
2245 | ||
2246 | if (!shell_input_line || ((!shell_input_line[shell_input_line_index]) && | |
2247 | (pushed_string_list == (STRING_SAVER *)NULL))) | |
2248 | #else /* !ALIAS && !DPAREN_ARITHMETIC */ | |
2249 | if (!shell_input_line || !shell_input_line[shell_input_line_index]) | |
2250 | #endif /* !ALIAS && !DPAREN_ARITHMETIC */ | |
2251 | { | |
2252 | line_number++; | |
2253 | ||
2254 | /* Let's not let one really really long line blow up memory allocation */ | |
2255 | if (shell_input_line && shell_input_line_size >= 32768) | |
2256 | { | |
2257 | free (shell_input_line); | |
2258 | shell_input_line = 0; | |
2259 | shell_input_line_size = 0; | |
2260 | } | |
2261 | ||
2262 | restart_read: | |
2263 | ||
2264 | /* Allow immediate exit if interrupted during input. */ | |
2265 | QUIT; | |
2266 | ||
2267 | i = truncating = 0; | |
2268 | shell_input_line_terminator = 0; | |
2269 | ||
2270 | /* If the shell is interatctive, but not currently printing a prompt | |
2271 | (interactive_shell && interactive == 0), we don't want to print | |
2272 | notifies or cleanup the jobs -- we want to defer it until we do | |
2273 | print the next prompt. */ | |
2274 | if (interactive_shell == 0 || SHOULD_PROMPT()) | |
2275 | { | |
2276 | #if defined (JOB_CONTROL) | |
2277 | /* This can cause a problem when reading a command as the result | |
2278 | of a trap, when the trap is called from flush_child. This call | |
2279 | had better not cause jobs to disappear from the job table in | |
2280 | that case, or we will have big trouble. */ | |
2281 | notify_and_cleanup (); | |
2282 | #else /* !JOB_CONTROL */ | |
2283 | cleanup_dead_jobs (); | |
2284 | #endif /* !JOB_CONTROL */ | |
2285 | } | |
2286 | ||
2287 | #if defined (READLINE) | |
2288 | if (no_line_editing && SHOULD_PROMPT()) | |
2289 | #else | |
2290 | if (SHOULD_PROMPT()) | |
2291 | #endif | |
2292 | print_prompt (); | |
2293 | ||
2294 | if (bash_input.type == st_stream) | |
2295 | clearerr (stdin); | |
2296 | ||
2297 | while (1) | |
2298 | { | |
2299 | c = yy_getc (); | |
2300 | ||
2301 | /* Allow immediate exit if interrupted during input. */ | |
2302 | QUIT; | |
2303 | ||
2304 | if (c == '\0') | |
2305 | { | |
2306 | #if 0 | |
2307 | internal_warning ("shell_getc: ignored null byte in input"); | |
2308 | #endif | |
2309 | continue; | |
2310 | } | |
2311 | ||
2312 | /* Theoretical overflow */ | |
2313 | /* If we can't put 256 bytes more into the buffer, allocate | |
2314 | everything we can and fill it as full as we can. */ | |
2315 | /* XXX - we ignore rest of line using `truncating' flag */ | |
2316 | if (shell_input_line_size > (SIZE_MAX - 256)) | |
2317 | { | |
2318 | size_t n; | |
2319 | ||
2320 | n = SIZE_MAX - i; /* how much more can we put into the buffer? */ | |
2321 | if (n <= 2) /* we have to save 1 for the newline added below */ | |
2322 | { | |
2323 | if (truncating == 0) | |
2324 | internal_warning(_("shell_getc: shell_input_line_size (%zu) exceeds SIZE_MAX (%lu): line truncated"), shell_input_line_size, (unsigned long)SIZE_MAX); | |
2325 | shell_input_line[i] = '\0'; | |
2326 | truncating = 1; | |
2327 | } | |
2328 | if (shell_input_line_size < SIZE_MAX) | |
2329 | { | |
2330 | shell_input_line_size = SIZE_MAX; | |
2331 | shell_input_line = xrealloc (shell_input_line, shell_input_line_size); | |
2332 | } | |
2333 | } | |
2334 | else | |
2335 | RESIZE_MALLOCED_BUFFER (shell_input_line, i, 2, shell_input_line_size, 256); | |
2336 | ||
2337 | if (c == EOF) | |
2338 | { | |
2339 | if (bash_input.type == st_stream) | |
2340 | clearerr (stdin); | |
2341 | ||
2342 | if (i == 0) | |
2343 | shell_input_line_terminator = EOF; | |
2344 | ||
2345 | shell_input_line[i] = '\0'; | |
2346 | break; | |
2347 | } | |
2348 | ||
2349 | if (truncating == 0 || c == '\n') | |
2350 | shell_input_line[i++] = c; | |
2351 | ||
2352 | if (c == '\n') | |
2353 | { | |
2354 | shell_input_line[--i] = '\0'; | |
2355 | current_command_line_count++; | |
2356 | break; | |
2357 | } | |
2358 | ||
2359 | last_was_backslash = last_was_backslash == 0 && c == '\\'; | |
2360 | } | |
2361 | ||
2362 | shell_input_line_index = 0; | |
2363 | shell_input_line_len = i; /* == strlen (shell_input_line) */ | |
2364 | ||
2365 | set_line_mbstate (); | |
2366 | ||
2367 | #if defined (HISTORY) | |
2368 | if (remember_on_history && shell_input_line && shell_input_line[0]) | |
2369 | { | |
2370 | char *expansions; | |
2371 | # if defined (BANG_HISTORY) | |
2372 | int old_hist; | |
2373 | ||
2374 | /* If the current delimiter is a single quote, we should not be | |
2375 | performing history expansion, even if we're on a different | |
2376 | line from the original single quote. */ | |
2377 | old_hist = history_expansion_inhibited; | |
2378 | if (current_delimiter (dstack) == '\'') | |
2379 | history_expansion_inhibited = 1; | |
2380 | # endif | |
2381 | /* Calling with a third argument of 1 allows remember_on_history to | |
2382 | determine whether or not the line is saved to the history list */ | |
2383 | expansions = pre_process_line (shell_input_line, 1, 1); | |
2384 | # if defined (BANG_HISTORY) | |
2385 | history_expansion_inhibited = old_hist; | |
2386 | # endif | |
2387 | if (expansions != shell_input_line) | |
2388 | { | |
2389 | free (shell_input_line); | |
2390 | shell_input_line = expansions; | |
2391 | shell_input_line_len = shell_input_line ? | |
2392 | strlen (shell_input_line) : 0; | |
2393 | if (shell_input_line_len == 0) | |
2394 | current_command_line_count--; | |
2395 | ||
2396 | /* We have to force the xrealloc below because we don't know | |
2397 | the true allocated size of shell_input_line anymore. */ | |
2398 | shell_input_line_size = shell_input_line_len; | |
2399 | ||
2400 | set_line_mbstate (); | |
2401 | } | |
2402 | } | |
2403 | /* Try to do something intelligent with blank lines encountered while | |
2404 | entering multi-line commands. XXX - this is grotesque */ | |
2405 | else if (remember_on_history && shell_input_line && | |
2406 | shell_input_line[0] == '\0' && | |
2407 | current_command_line_count > 1) | |
2408 | { | |
2409 | if (current_delimiter (dstack)) | |
2410 | /* We know shell_input_line[0] == 0 and we're reading some sort of | |
2411 | quoted string. This means we've got a line consisting of only | |
2412 | a newline in a quoted string. We want to make sure this line | |
2413 | gets added to the history. */ | |
2414 | maybe_add_history (shell_input_line); | |
2415 | else | |
2416 | { | |
2417 | char *hdcs; | |
2418 | hdcs = history_delimiting_chars (shell_input_line); | |
2419 | if (hdcs && hdcs[0] == ';') | |
2420 | maybe_add_history (shell_input_line); | |
2421 | } | |
2422 | } | |
2423 | ||
2424 | #endif /* HISTORY */ | |
2425 | ||
2426 | if (shell_input_line) | |
2427 | { | |
2428 | /* Lines that signify the end of the shell's input should not be | |
2429 | echoed. We should not echo lines while parsing command | |
2430 | substitutions with recursive calls into the parsing engine; those | |
2431 | should only be echoed once when we read the word. That is the | |
2432 | reason for the test against shell_eof_token, which is set to a | |
2433 | right paren when parsing the contents of command substitutions. */ | |
2434 | if (echo_input_at_read && (shell_input_line[0] || | |
2435 | shell_input_line_terminator != EOF) && | |
2436 | shell_eof_token == 0) | |
2437 | fprintf (stderr, "%s\n", shell_input_line); | |
2438 | } | |
2439 | else | |
2440 | { | |
2441 | shell_input_line_size = 0; | |
2442 | prompt_string_pointer = ¤t_prompt_string; | |
2443 | if (SHOULD_PROMPT ()) | |
2444 | prompt_again (); | |
2445 | goto restart_read; | |
2446 | } | |
2447 | ||
2448 | /* Add the newline to the end of this string, iff the string does | |
2449 | not already end in an EOF character. */ | |
2450 | if (shell_input_line_terminator != EOF) | |
2451 | { | |
2452 | if (shell_input_line_size < SIZE_MAX-3 && (shell_input_line_len+3 > shell_input_line_size)) | |
2453 | shell_input_line = (char *)xrealloc (shell_input_line, | |
2454 | 1 + (shell_input_line_size += 2)); | |
2455 | ||
2456 | /* Don't add a newline to a string that ends with a backslash if we're | |
2457 | going to be removing quoted newlines, since that will eat the | |
2458 | backslash. Add another backslash instead (will be removed by | |
2459 | word expansion). */ | |
2460 | if (bash_input.type == st_string && expanding_alias() == 0 && last_was_backslash && c == EOF && remove_quoted_newline) | |
2461 | shell_input_line[shell_input_line_len] = '\\'; | |
2462 | else | |
2463 | shell_input_line[shell_input_line_len] = '\n'; | |
2464 | shell_input_line[shell_input_line_len + 1] = '\0'; | |
2465 | ||
2466 | set_line_mbstate (); | |
2467 | } | |
2468 | } | |
2469 | ||
2470 | next_alias_char: | |
2471 | uc = shell_input_line[shell_input_line_index]; | |
2472 | ||
2473 | if (uc) | |
2474 | shell_input_line_index++; | |
2475 | ||
2476 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
2477 | /* If UC is NULL, we have reached the end of the current input string. If | |
2478 | pushed_string_list is non-empty, it's time to pop to the previous string | |
2479 | because we have fully consumed the result of the last alias expansion. | |
2480 | Do it transparently; just return the next character of the string popped | |
2481 | to. */ | |
2482 | /* If pushed_string_list != 0 but pushed_string_list->expander == 0 (not | |
2483 | currently tested) and the flags value is not PSH_SOURCE, we are not | |
2484 | parsing an alias, we have just saved one (push_string, when called by | |
2485 | the parse_dparen code) In this case, just go on as well. The PSH_SOURCE | |
2486 | case is handled below. */ | |
2487 | pop_alias: | |
2488 | if (uc == 0 && pushed_string_list && pushed_string_list->flags != PSH_SOURCE) | |
2489 | { | |
2490 | pop_string (); | |
2491 | uc = shell_input_line[shell_input_line_index]; | |
2492 | if (uc) | |
2493 | shell_input_line_index++; | |
2494 | } | |
2495 | #endif /* ALIAS || DPAREN_ARITHMETIC */ | |
2496 | ||
2497 | if MBTEST(uc == '\\' && remove_quoted_newline && shell_input_line[shell_input_line_index] == '\n') | |
2498 | { | |
2499 | if (SHOULD_PROMPT ()) | |
2500 | prompt_again (); | |
2501 | line_number++; | |
2502 | /* What do we do here if we're expanding an alias whose definition | |
2503 | includes an escaped newline? If that's the last character in the | |
2504 | alias expansion, we just pop the pushed string list (recall that | |
2505 | we inhibit the appending of a space in mk_alexpansion() if newline | |
2506 | is the last character). If it's not the last character, we need | |
2507 | to consume the quoted newline and move to the next character in | |
2508 | the expansion. */ | |
2509 | #if defined (ALIAS) | |
2510 | if (expanding_alias () && shell_input_line[shell_input_line_index+1] == '\0') | |
2511 | { | |
2512 | uc = 0; | |
2513 | goto pop_alias; | |
2514 | } | |
2515 | else if (expanding_alias () && shell_input_line[shell_input_line_index+1] != '\0') | |
2516 | { | |
2517 | shell_input_line_index++; /* skip newline */ | |
2518 | goto next_alias_char; /* and get next character */ | |
2519 | } | |
2520 | else | |
2521 | #endif | |
2522 | goto restart_read; | |
2523 | } | |
2524 | ||
2525 | if (uc == 0 && shell_input_line_terminator == EOF) | |
2526 | return ((shell_input_line_index != 0) ? '\n' : EOF); | |
2527 | ||
2528 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
2529 | /* We already know that we are not parsing an alias expansion because of the | |
2530 | check for expanding_alias() above. This knows how parse_and_execute | |
2531 | handles switching to st_string input while an alias is being expanded, | |
2532 | hence the check for pushed_string_list without pushed_string_list->expander | |
2533 | and the check for PSH_SOURCE as pushed_string_list->flags. | |
2534 | parse_and_execute and parse_string both change the input type to st_string | |
2535 | and place the string to be parsed and executed into location.string, so | |
2536 | we should not stop reading that until the pointer is '\0'. | |
2537 | The check for shell_input_line_terminator may be superfluous. | |
2538 | ||
2539 | This solves the problem of `.' inside a multi-line alias with embedded | |
2540 | newlines executing things out of order. */ | |
2541 | if (uc == 0 && bash_input.type == st_string && *bash_input.location.string && | |
2542 | pushed_string_list && pushed_string_list->flags == PSH_SOURCE && | |
2543 | shell_input_line_terminator == 0) | |
2544 | { | |
2545 | shell_input_line_index = 0; | |
2546 | goto restart_read; | |
2547 | } | |
2548 | #endif | |
2549 | ||
2550 | return (uc); | |
2551 | } | |
2552 | ||
2553 | /* Put C back into the input for the shell. This might need changes for | |
2554 | HANDLE_MULTIBYTE around EOLs. Since we (currently) never push back a | |
2555 | character different than we read, shell_input_line_property doesn't need | |
2556 | to change when manipulating shell_input_line. The define for | |
2557 | last_shell_getc_is_singlebyte should take care of it, though. */ | |
2558 | static void | |
2559 | shell_ungetc (c) | |
2560 | int c; | |
2561 | { | |
2562 | if (shell_input_line && shell_input_line_index) | |
2563 | shell_input_line[--shell_input_line_index] = c; | |
2564 | else | |
2565 | eol_ungetc_lookahead = c; | |
2566 | } | |
2567 | ||
2568 | char * | |
2569 | parser_remaining_input () | |
2570 | { | |
2571 | if (shell_input_line == 0) | |
2572 | return 0; | |
2573 | if (shell_input_line_index < 0 || shell_input_line_index >= shell_input_line_len) | |
2574 | return ""; /* XXX */ | |
2575 | return (shell_input_line + shell_input_line_index); | |
2576 | } | |
2577 | ||
2578 | #ifdef INCLUDE_UNUSED | |
2579 | /* Back the input pointer up by one, effectively `ungetting' a character. */ | |
2580 | static void | |
2581 | shell_ungetchar () | |
2582 | { | |
2583 | if (shell_input_line && shell_input_line_index) | |
2584 | shell_input_line_index--; | |
2585 | } | |
2586 | #endif | |
2587 | ||
2588 | /* Discard input until CHARACTER is seen, then push that character back | |
2589 | onto the input stream. */ | |
2590 | static void | |
2591 | discard_until (character) | |
2592 | int character; | |
2593 | { | |
2594 | int c; | |
2595 | ||
2596 | while ((c = shell_getc (0)) != EOF && c != character) | |
2597 | ; | |
2598 | ||
2599 | if (c != EOF) | |
2600 | shell_ungetc (c); | |
2601 | } | |
2602 | ||
2603 | void | |
2604 | execute_variable_command (command, vname) | |
2605 | char *command, *vname; | |
2606 | { | |
2607 | char *last_lastarg; | |
2608 | sh_parser_state_t ps; | |
2609 | ||
2610 | save_parser_state (&ps); | |
2611 | last_lastarg = get_string_value ("_"); | |
2612 | if (last_lastarg) | |
2613 | last_lastarg = savestring (last_lastarg); | |
2614 | ||
2615 | parse_and_execute (savestring (command), vname, SEVAL_NONINT|SEVAL_NOHIST); | |
2616 | ||
2617 | restore_parser_state (&ps); | |
2618 | bind_variable ("_", last_lastarg, 0); | |
2619 | FREE (last_lastarg); | |
2620 | ||
2621 | if (token_to_read == '\n') /* reset_parser was called */ | |
2622 | token_to_read = 0; | |
2623 | } | |
2624 | ||
2625 | void | |
2626 | push_token (x) | |
2627 | int x; | |
2628 | { | |
2629 | two_tokens_ago = token_before_that; | |
2630 | token_before_that = last_read_token; | |
2631 | last_read_token = current_token; | |
2632 | ||
2633 | current_token = x; | |
2634 | } | |
2635 | ||
2636 | /* Place to remember the token. We try to keep the buffer | |
2637 | at a reasonable size, but it can grow. */ | |
2638 | static char *token = (char *)NULL; | |
2639 | ||
2640 | /* Current size of the token buffer. */ | |
2641 | static int token_buffer_size; | |
2642 | ||
2643 | /* Command to read_token () explaining what we want it to do. */ | |
2644 | #define READ 0 | |
2645 | #define RESET 1 | |
2646 | #define prompt_is_ps1 \ | |
2647 | (!prompt_string_pointer || prompt_string_pointer == &ps1_prompt) | |
2648 | ||
2649 | /* Function for yyparse to call. yylex keeps track of | |
2650 | the last two tokens read, and calls read_token. */ | |
2651 | static int | |
2652 | yylex () | |
2653 | { | |
2654 | if (interactive && (current_token == 0 || current_token == '\n')) | |
2655 | { | |
2656 | /* Before we print a prompt, we might have to check mailboxes. | |
2657 | We do this only if it is time to do so. Notice that only here | |
2658 | is the mail alarm reset; nothing takes place in check_mail () | |
2659 | except the checking of mail. Please don't change this. */ | |
2660 | if (prompt_is_ps1 && parse_and_execute_level == 0 && time_to_check_mail ()) | |
2661 | { | |
2662 | check_mail (); | |
2663 | reset_mail_timer (); | |
2664 | } | |
2665 | ||
2666 | /* Avoid printing a prompt if we're not going to read anything, e.g. | |
2667 | after resetting the parser with read_token (RESET). */ | |
2668 | if (token_to_read == 0 && SHOULD_PROMPT ()) | |
2669 | prompt_again (); | |
2670 | } | |
2671 | ||
2672 | two_tokens_ago = token_before_that; | |
2673 | token_before_that = last_read_token; | |
2674 | last_read_token = current_token; | |
2675 | current_token = read_token (READ); | |
2676 | ||
2677 | if ((parser_state & PST_EOFTOKEN) && current_token == shell_eof_token) | |
2678 | { | |
2679 | current_token = yacc_EOF; | |
2680 | if (bash_input.type == st_string) | |
2681 | rewind_input_string (); | |
2682 | } | |
2683 | parser_state &= ~PST_EOFTOKEN; | |
2684 | ||
2685 | return (current_token); | |
2686 | } | |
2687 | ||
2688 | /* When non-zero, we have read the required tokens | |
2689 | which allow ESAC to be the next one read. */ | |
2690 | static int esacs_needed_count; | |
2691 | ||
2692 | static void | |
2693 | push_heredoc (r) | |
2694 | REDIRECT *r; | |
2695 | { | |
2696 | if (need_here_doc >= HEREDOC_MAX) | |
2697 | { | |
2698 | last_command_exit_value = EX_BADUSAGE; | |
2699 | need_here_doc = 0; | |
2700 | report_syntax_error (_("maximum here-document count exceeded")); | |
2701 | reset_parser (); | |
2702 | exit_shell (last_command_exit_value); | |
2703 | } | |
2704 | redir_stack[need_here_doc++] = r; | |
2705 | } | |
2706 | ||
2707 | void | |
2708 | gather_here_documents () | |
2709 | { | |
2710 | int r; | |
2711 | ||
2712 | r = 0; | |
2713 | here_doc_first_line = 1; | |
2714 | while (need_here_doc > 0) | |
2715 | { | |
2716 | parser_state |= PST_HEREDOC; | |
2717 | make_here_document (redir_stack[r++], line_number); | |
2718 | parser_state &= ~PST_HEREDOC; | |
2719 | need_here_doc--; | |
2720 | redir_stack[r - 1] = 0; /* XXX */ | |
2721 | } | |
2722 | here_doc_first_line = 0; /* just in case */ | |
2723 | } | |
2724 | ||
2725 | /* When non-zero, an open-brace used to create a group is awaiting a close | |
2726 | brace partner. */ | |
2727 | static int open_brace_count; | |
2728 | ||
2729 | /* In the following three macros, `token' is always last_read_token */ | |
2730 | ||
2731 | /* Are we in the middle of parsing a redirection where we are about to read | |
2732 | a word? This is used to make sure alias expansion doesn't happen in the | |
2733 | middle of a redirection, even though we're parsing a simple command. */ | |
2734 | #define parsing_redirection(token) \ | |
2735 | (token == '<' || token == '>' || \ | |
2736 | token == GREATER_GREATER || token == GREATER_BAR || \ | |
2737 | token == LESS_GREATER || token == LESS_LESS_MINUS || \ | |
2738 | token == LESS_LESS || token == LESS_LESS_LESS || \ | |
2739 | token == LESS_AND || token == GREATER_AND || token == AND_GREATER) | |
2740 | ||
2741 | /* Is `token' one that will allow a WORD to be read in a command position? | |
2742 | We can read a simple command name on which we should attempt alias expansion | |
2743 | or we can read an assignment statement. */ | |
2744 | #define command_token_position(token) \ | |
2745 | (((token) == ASSIGNMENT_WORD) || \ | |
2746 | ((parser_state&PST_REDIRLIST) && parsing_redirection(token) == 0) || \ | |
2747 | ((token) != SEMI_SEMI && (token) != SEMI_AND && (token) != SEMI_SEMI_AND && reserved_word_acceptable(token))) | |
2748 | ||
2749 | /* Are we in a position where we can read an assignment statement? */ | |
2750 | #define assignment_acceptable(token) \ | |
2751 | (command_token_position(token) && ((parser_state & PST_CASEPAT) == 0)) | |
2752 | ||
2753 | /* Check to see if TOKEN is a reserved word and return the token | |
2754 | value if it is. */ | |
2755 | #define CHECK_FOR_RESERVED_WORD(tok) \ | |
2756 | do { \ | |
2757 | if (!dollar_present && !quoted && \ | |
2758 | reserved_word_acceptable (last_read_token)) \ | |
2759 | { \ | |
2760 | int i; \ | |
2761 | for (i = 0; word_token_alist[i].word != (char *)NULL; i++) \ | |
2762 | if (STREQ (tok, word_token_alist[i].word)) \ | |
2763 | { \ | |
2764 | if ((parser_state & PST_CASEPAT) && (word_token_alist[i].token != ESAC)) \ | |
2765 | break; \ | |
2766 | if (word_token_alist[i].token == TIME && time_command_acceptable () == 0) \ | |
2767 | break; \ | |
2768 | if ((parser_state & PST_CASEPAT) && last_read_token == '|' && word_token_alist[i].token == ESAC) \ | |
2769 | break; /* Posix grammar rule 4 */ \ | |
2770 | if (word_token_alist[i].token == ESAC) \ | |
2771 | parser_state &= ~(PST_CASEPAT|PST_CASESTMT); \ | |
2772 | else if (word_token_alist[i].token == CASE) \ | |
2773 | parser_state |= PST_CASESTMT; \ | |
2774 | else if (word_token_alist[i].token == COND_END) \ | |
2775 | parser_state &= ~(PST_CONDCMD|PST_CONDEXPR); \ | |
2776 | else if (word_token_alist[i].token == COND_START) \ | |
2777 | parser_state |= PST_CONDCMD; \ | |
2778 | else if (word_token_alist[i].token == '{') \ | |
2779 | open_brace_count++; \ | |
2780 | else if (word_token_alist[i].token == '}' && open_brace_count) \ | |
2781 | open_brace_count--; \ | |
2782 | return (word_token_alist[i].token); \ | |
2783 | } \ | |
2784 | } \ | |
2785 | } while (0) | |
2786 | ||
2787 | #if defined (ALIAS) | |
2788 | ||
2789 | /* OK, we have a token. Let's try to alias expand it, if (and only if) | |
2790 | it's eligible. | |
2791 | ||
2792 | It is eligible for expansion if EXPAND_ALIASES is set, and | |
2793 | the token is unquoted and the last token read was a command | |
2794 | separator (or expand_next_token is set), and we are currently | |
2795 | processing an alias (pushed_string_list is non-empty) and this | |
2796 | token is not the same as the current or any previously | |
2797 | processed alias. | |
2798 | ||
2799 | Special cases that disqualify: | |
2800 | In a pattern list in a case statement (parser_state & PST_CASEPAT). */ | |
2801 | ||
2802 | static char * | |
2803 | mk_alexpansion (s) | |
2804 | char *s; | |
2805 | { | |
2806 | int l; | |
2807 | char *r; | |
2808 | ||
2809 | l = strlen (s); | |
2810 | r = xmalloc (l + 2); | |
2811 | strcpy (r, s); | |
2812 | /* If the last character in the alias is a newline, don't add a trailing | |
2813 | space to the expansion. Works with shell_getc above. */ | |
2814 | if (r[l - 1] != ' ' && r[l - 1] != '\n' && shellmeta(r[l - 1]) == 0) | |
2815 | r[l++] = ' '; | |
2816 | r[l] = '\0'; | |
2817 | return r; | |
2818 | } | |
2819 | ||
2820 | static int | |
2821 | alias_expand_token (tokstr) | |
2822 | char *tokstr; | |
2823 | { | |
2824 | char *expanded; | |
2825 | alias_t *ap; | |
2826 | ||
2827 | if (((parser_state & PST_ALEXPNEXT) || command_token_position (last_read_token)) && | |
2828 | (parser_state & PST_CASEPAT) == 0) | |
2829 | { | |
2830 | ap = find_alias (tokstr); | |
2831 | ||
2832 | /* Currently expanding this token. */ | |
2833 | if (ap && (ap->flags & AL_BEINGEXPANDED)) | |
2834 | return (NO_EXPANSION); | |
2835 | ||
2836 | /* mk_alexpansion puts an extra space on the end of the alias expansion, | |
2837 | so the lookahead by the parser works right. If this gets changed, | |
2838 | make sure the code in shell_getc that deals with reaching the end of | |
2839 | an expanded alias is changed with it. */ | |
2840 | expanded = ap ? mk_alexpansion (ap->value) : (char *)NULL; | |
2841 | ||
2842 | if (expanded) | |
2843 | { | |
2844 | push_string (expanded, ap->flags & AL_EXPANDNEXT, ap); | |
2845 | return (RE_READ_TOKEN); | |
2846 | } | |
2847 | else | |
2848 | /* This is an eligible token that does not have an expansion. */ | |
2849 | return (NO_EXPANSION); | |
2850 | } | |
2851 | return (NO_EXPANSION); | |
2852 | } | |
2853 | #endif /* ALIAS */ | |
2854 | ||
2855 | static int | |
2856 | time_command_acceptable () | |
2857 | { | |
2858 | #if defined (COMMAND_TIMING) | |
2859 | int i; | |
2860 | ||
2861 | if (posixly_correct && shell_compatibility_level > 41) | |
2862 | { | |
2863 | /* Quick check of the rest of the line to find the next token. If it | |
2864 | begins with a `-', Posix says to not return `time' as the token. | |
2865 | This was interp 267. */ | |
2866 | i = shell_input_line_index; | |
2867 | while (i < shell_input_line_len && (shell_input_line[i] == ' ' || shell_input_line[i] == '\t')) | |
2868 | i++; | |
2869 | if (shell_input_line[i] == '-') | |
2870 | return 0; | |
2871 | } | |
2872 | ||
2873 | switch (last_read_token) | |
2874 | { | |
2875 | case 0: | |
2876 | case ';': | |
2877 | case '\n': | |
2878 | if (token_before_that == '|') | |
2879 | return (0); | |
2880 | /* FALLTHROUGH */ | |
2881 | case AND_AND: | |
2882 | case OR_OR: | |
2883 | case '&': | |
2884 | case WHILE: | |
2885 | case DO: | |
2886 | case UNTIL: | |
2887 | case IF: | |
2888 | case THEN: | |
2889 | case ELIF: | |
2890 | case ELSE: | |
2891 | case '{': /* } */ | |
2892 | case '(': /* )( */ | |
2893 | case ')': /* only valid in case statement */ | |
2894 | case BANG: /* ! time pipeline */ | |
2895 | case TIME: /* time time pipeline */ | |
2896 | case TIMEOPT: /* time -p time pipeline */ | |
2897 | case TIMEIGN: /* time -p -- ... */ | |
2898 | return 1; | |
2899 | default: | |
2900 | return 0; | |
2901 | } | |
2902 | #else | |
2903 | return 0; | |
2904 | #endif /* COMMAND_TIMING */ | |
2905 | } | |
2906 | ||
2907 | /* Handle special cases of token recognition: | |
2908 | IN is recognized if the last token was WORD and the token | |
2909 | before that was FOR or CASE or SELECT. | |
2910 | ||
2911 | DO is recognized if the last token was WORD and the token | |
2912 | before that was FOR or SELECT. | |
2913 | ||
2914 | ESAC is recognized if the last token caused `esacs_needed_count' | |
2915 | to be set | |
2916 | ||
2917 | `{' is recognized if the last token as WORD and the token | |
2918 | before that was FUNCTION, or if we just parsed an arithmetic | |
2919 | `for' command. | |
2920 | ||
2921 | `}' is recognized if there is an unclosed `{' present. | |
2922 | ||
2923 | `-p' is returned as TIMEOPT if the last read token was TIME. | |
2924 | `--' is returned as TIMEIGN if the last read token was TIMEOPT. | |
2925 | ||
2926 | ']]' is returned as COND_END if the parser is currently parsing | |
2927 | a conditional expression ((parser_state & PST_CONDEXPR) != 0) | |
2928 | ||
2929 | `time' is returned as TIME if and only if it is immediately | |
2930 | preceded by one of `;', `\n', `||', `&&', or `&'. | |
2931 | */ | |
2932 | ||
2933 | static int | |
2934 | special_case_tokens (tokstr) | |
2935 | char *tokstr; | |
2936 | { | |
2937 | if ((last_read_token == WORD) && | |
2938 | #if defined (SELECT_COMMAND) | |
2939 | ((token_before_that == FOR) || (token_before_that == CASE) || (token_before_that == SELECT)) && | |
2940 | #else | |
2941 | ((token_before_that == FOR) || (token_before_that == CASE)) && | |
2942 | #endif | |
2943 | (tokstr[0] == 'i' && tokstr[1] == 'n' && tokstr[2] == 0)) | |
2944 | { | |
2945 | if (token_before_that == CASE) | |
2946 | { | |
2947 | parser_state |= PST_CASEPAT; | |
2948 | esacs_needed_count++; | |
2949 | } | |
2950 | return (IN); | |
2951 | } | |
2952 | ||
2953 | if (last_read_token == WORD && | |
2954 | #if defined (SELECT_COMMAND) | |
2955 | (token_before_that == FOR || token_before_that == SELECT) && | |
2956 | #else | |
2957 | (token_before_that == FOR) && | |
2958 | #endif | |
2959 | (tokstr[0] == 'd' && tokstr[1] == 'o' && tokstr[2] == '\0')) | |
2960 | return (DO); | |
2961 | ||
2962 | /* Ditto for ESAC in the CASE case. | |
2963 | Specifically, this handles "case word in esac", which is a legal | |
2964 | construct, certainly because someone will pass an empty arg to the | |
2965 | case construct, and we don't want it to barf. Of course, we should | |
2966 | insist that the case construct has at least one pattern in it, but | |
2967 | the designers disagree. */ | |
2968 | if (esacs_needed_count) | |
2969 | { | |
2970 | esacs_needed_count--; | |
2971 | if (STREQ (tokstr, "esac")) | |
2972 | { | |
2973 | parser_state &= ~PST_CASEPAT; | |
2974 | return (ESAC); | |
2975 | } | |
2976 | } | |
2977 | ||
2978 | /* The start of a shell function definition. */ | |
2979 | if (parser_state & PST_ALLOWOPNBRC) | |
2980 | { | |
2981 | parser_state &= ~PST_ALLOWOPNBRC; | |
2982 | if (tokstr[0] == '{' && tokstr[1] == '\0') /* } */ | |
2983 | { | |
2984 | open_brace_count++; | |
2985 | function_bstart = line_number; | |
2986 | return ('{'); /* } */ | |
2987 | } | |
2988 | } | |
2989 | ||
2990 | /* We allow a `do' after a for ((...)) without an intervening | |
2991 | list_terminator */ | |
2992 | if (last_read_token == ARITH_FOR_EXPRS && tokstr[0] == 'd' && tokstr[1] == 'o' && !tokstr[2]) | |
2993 | return (DO); | |
2994 | if (last_read_token == ARITH_FOR_EXPRS && tokstr[0] == '{' && tokstr[1] == '\0') /* } */ | |
2995 | { | |
2996 | open_brace_count++; | |
2997 | return ('{'); /* } */ | |
2998 | } | |
2999 | ||
3000 | if (open_brace_count && reserved_word_acceptable (last_read_token) && tokstr[0] == '}' && !tokstr[1]) | |
3001 | { | |
3002 | open_brace_count--; /* { */ | |
3003 | return ('}'); | |
3004 | } | |
3005 | ||
3006 | #if defined (COMMAND_TIMING) | |
3007 | /* Handle -p after `time'. */ | |
3008 | if (last_read_token == TIME && tokstr[0] == '-' && tokstr[1] == 'p' && !tokstr[2]) | |
3009 | return (TIMEOPT); | |
3010 | /* Handle -- after `time -p'. */ | |
3011 | if (last_read_token == TIMEOPT && tokstr[0] == '-' && tokstr[1] == '-' && !tokstr[2]) | |
3012 | return (TIMEIGN); | |
3013 | #endif | |
3014 | ||
3015 | #if defined (COND_COMMAND) /* [[ */ | |
3016 | if ((parser_state & PST_CONDEXPR) && tokstr[0] == ']' && tokstr[1] == ']' && tokstr[2] == '\0') | |
3017 | return (COND_END); | |
3018 | #endif | |
3019 | ||
3020 | return (-1); | |
3021 | } | |
3022 | ||
3023 | /* Called from shell.c when Control-C is typed at top level. Or | |
3024 | by the error rule at top level. */ | |
3025 | void | |
3026 | reset_parser () | |
3027 | { | |
3028 | dstack.delimiter_depth = 0; /* No delimiters found so far. */ | |
3029 | open_brace_count = 0; | |
3030 | ||
3031 | #if defined (EXTENDED_GLOB) | |
3032 | /* Reset to global value of extended glob */ | |
3033 | if (parser_state & PST_EXTPAT) | |
3034 | extended_glob = global_extglob; | |
3035 | #endif | |
3036 | ||
3037 | parser_state = 0; | |
3038 | here_doc_first_line = 0; | |
3039 | ||
3040 | #if defined (ALIAS) || defined (DPAREN_ARITHMETIC) | |
3041 | if (pushed_string_list) | |
3042 | free_string_list (); | |
3043 | #endif /* ALIAS || DPAREN_ARITHMETIC */ | |
3044 | ||
3045 | /* This is where we resynchronize to the next newline on error/reset */ | |
3046 | if (shell_input_line) | |
3047 | { | |
3048 | free (shell_input_line); | |
3049 | shell_input_line = (char *)NULL; | |
3050 | shell_input_line_size = shell_input_line_index = 0; | |
3051 | } | |
3052 | ||
3053 | FREE (word_desc_to_read); | |
3054 | word_desc_to_read = (WORD_DESC *)NULL; | |
3055 | ||
3056 | eol_ungetc_lookahead = 0; | |
3057 | ||
3058 | current_token = '\n'; /* XXX */ | |
3059 | last_read_token = '\n'; | |
3060 | token_to_read = '\n'; | |
3061 | } | |
3062 | ||
3063 | /* Read the next token. Command can be READ (normal operation) or | |
3064 | RESET (to normalize state). */ | |
3065 | static int | |
3066 | read_token (command) | |
3067 | int command; | |
3068 | { | |
3069 | int character; /* Current character. */ | |
3070 | int peek_char; /* Temporary look-ahead character. */ | |
3071 | int result; /* The thing to return. */ | |
3072 | ||
3073 | if (command == RESET) | |
3074 | { | |
3075 | reset_parser (); | |
3076 | return ('\n'); | |
3077 | } | |
3078 | ||
3079 | if (token_to_read) | |
3080 | { | |
3081 | result = token_to_read; | |
3082 | if (token_to_read == WORD || token_to_read == ASSIGNMENT_WORD) | |
3083 | { | |
3084 | yylval.word = word_desc_to_read; | |
3085 | word_desc_to_read = (WORD_DESC *)NULL; | |
3086 | } | |
3087 | token_to_read = 0; | |
3088 | return (result); | |
3089 | } | |
3090 | ||
3091 | #if defined (COND_COMMAND) | |
3092 | if ((parser_state & (PST_CONDCMD|PST_CONDEXPR)) == PST_CONDCMD) | |
3093 | { | |
3094 | cond_lineno = line_number; | |
3095 | parser_state |= PST_CONDEXPR; | |
3096 | yylval.command = parse_cond_command (); | |
3097 | if (cond_token != COND_END) | |
3098 | { | |
3099 | cond_error (); | |
3100 | return (-1); | |
3101 | } | |
3102 | token_to_read = COND_END; | |
3103 | parser_state &= ~(PST_CONDEXPR|PST_CONDCMD); | |
3104 | return (COND_CMD); | |
3105 | } | |
3106 | #endif | |
3107 | ||
3108 | #if defined (ALIAS) | |
3109 | /* This is a place to jump back to once we have successfully expanded a | |
3110 | token with an alias and pushed the string with push_string () */ | |
3111 | re_read_token: | |
3112 | #endif /* ALIAS */ | |
3113 | ||
3114 | /* Read a single word from input. Start by skipping blanks. */ | |
3115 | while ((character = shell_getc (1)) != EOF && shellblank (character)) | |
3116 | ; | |
3117 | ||
3118 | if (character == EOF) | |
3119 | { | |
3120 | EOF_Reached = 1; | |
3121 | return (yacc_EOF); | |
3122 | } | |
3123 | ||
3124 | if MBTEST(character == '#' && (!interactive || interactive_comments)) | |
3125 | { | |
3126 | /* A comment. Discard until EOL or EOF, and then return a newline. */ | |
3127 | discard_until ('\n'); | |
3128 | shell_getc (0); | |
3129 | character = '\n'; /* this will take the next if statement and return. */ | |
3130 | } | |
3131 | ||
3132 | if (character == '\n') | |
3133 | { | |
3134 | /* If we're about to return an unquoted newline, we can go and collect | |
3135 | the text of any pending here document. */ | |
3136 | if (need_here_doc) | |
3137 | gather_here_documents (); | |
3138 | ||
3139 | #if defined (ALIAS) | |
3140 | parser_state &= ~PST_ALEXPNEXT; | |
3141 | #endif /* ALIAS */ | |
3142 | ||
3143 | parser_state &= ~PST_ASSIGNOK; | |
3144 | ||
3145 | return (character); | |
3146 | } | |
3147 | ||
3148 | if (parser_state & PST_REGEXP) | |
3149 | goto tokword; | |
3150 | ||
3151 | /* Shell meta-characters. */ | |
3152 | if MBTEST(shellmeta (character) && ((parser_state & PST_DBLPAREN) == 0)) | |
3153 | { | |
3154 | #if defined (ALIAS) | |
3155 | /* Turn off alias tokenization iff this character sequence would | |
3156 | not leave us ready to read a command. */ | |
3157 | if (character == '<' || character == '>') | |
3158 | parser_state &= ~PST_ALEXPNEXT; | |
3159 | #endif /* ALIAS */ | |
3160 | ||
3161 | parser_state &= ~PST_ASSIGNOK; | |
3162 | ||
3163 | /* If we are parsing a command substitution and we have read a character | |
3164 | that marks the end of it, don't bother to skip over quoted newlines | |
3165 | when we read the next token. We're just interested in a character | |
3166 | that will turn this into a two-character token, so we let the higher | |
3167 | layers deal with quoted newlines following the command substitution. */ | |
3168 | if ((parser_state & PST_CMDSUBST) && character == shell_eof_token) | |
3169 | peek_char = shell_getc (0); | |
3170 | else | |
3171 | peek_char = shell_getc (1); | |
3172 | ||
3173 | if (character == peek_char) | |
3174 | { | |
3175 | switch (character) | |
3176 | { | |
3177 | case '<': | |
3178 | /* If '<' then we could be at "<<" or at "<<-". We have to | |
3179 | look ahead one more character. */ | |
3180 | peek_char = shell_getc (1); | |
3181 | if MBTEST(peek_char == '-') | |
3182 | return (LESS_LESS_MINUS); | |
3183 | else if MBTEST(peek_char == '<') | |
3184 | return (LESS_LESS_LESS); | |
3185 | else | |
3186 | { | |
3187 | shell_ungetc (peek_char); | |
3188 | return (LESS_LESS); | |
3189 | } | |
3190 | ||
3191 | case '>': | |
3192 | return (GREATER_GREATER); | |
3193 | ||
3194 | case ';': | |
3195 | parser_state |= PST_CASEPAT; | |
3196 | #if defined (ALIAS) | |
3197 | parser_state &= ~PST_ALEXPNEXT; | |
3198 | #endif /* ALIAS */ | |
3199 | ||
3200 | peek_char = shell_getc (1); | |
3201 | if MBTEST(peek_char == '&') | |
3202 | return (SEMI_SEMI_AND); | |
3203 | else | |
3204 | { | |
3205 | shell_ungetc (peek_char); | |
3206 | return (SEMI_SEMI); | |
3207 | } | |
3208 | ||
3209 | case '&': | |
3210 | return (AND_AND); | |
3211 | ||
3212 | case '|': | |
3213 | return (OR_OR); | |
3214 | ||
3215 | #if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND) | |
3216 | case '(': /* ) */ | |
3217 | result = parse_dparen (character); | |
3218 | if (result == -2) | |
3219 | break; | |
3220 | else | |
3221 | return result; | |
3222 | #endif | |
3223 | } | |
3224 | } | |
3225 | else if MBTEST(character == '<' && peek_char == '&') | |
3226 | return (LESS_AND); | |
3227 | else if MBTEST(character == '>' && peek_char == '&') | |
3228 | return (GREATER_AND); | |
3229 | else if MBTEST(character == '<' && peek_char == '>') | |
3230 | return (LESS_GREATER); | |
3231 | else if MBTEST(character == '>' && peek_char == '|') | |
3232 | return (GREATER_BAR); | |
3233 | else if MBTEST(character == '&' && peek_char == '>') | |
3234 | { | |
3235 | peek_char = shell_getc (1); | |
3236 | if MBTEST(peek_char == '>') | |
3237 | return (AND_GREATER_GREATER); | |
3238 | else | |
3239 | { | |
3240 | shell_ungetc (peek_char); | |
3241 | return (AND_GREATER); | |
3242 | } | |
3243 | } | |
3244 | else if MBTEST(character == '|' && peek_char == '&') | |
3245 | return (BAR_AND); | |
3246 | else if MBTEST(character == ';' && peek_char == '&') | |
3247 | { | |
3248 | parser_state |= PST_CASEPAT; | |
3249 | #if defined (ALIAS) | |
3250 | parser_state &= ~PST_ALEXPNEXT; | |
3251 | #endif /* ALIAS */ | |
3252 | return (SEMI_AND); | |
3253 | } | |
3254 | ||
3255 | shell_ungetc (peek_char); | |
3256 | ||
3257 | /* If we look like we are reading the start of a function | |
3258 | definition, then let the reader know about it so that | |
3259 | we will do the right thing with `{'. */ | |
3260 | if MBTEST(character == ')' && last_read_token == '(' && token_before_that == WORD) | |
3261 | { | |
3262 | parser_state |= PST_ALLOWOPNBRC; | |
3263 | #if defined (ALIAS) | |
3264 | parser_state &= ~PST_ALEXPNEXT; | |
3265 | #endif /* ALIAS */ | |
3266 | function_dstart = line_number; | |
3267 | } | |
3268 | ||
3269 | /* case pattern lists may be preceded by an optional left paren. If | |
3270 | we're not trying to parse a case pattern list, the left paren | |
3271 | indicates a subshell. */ | |
3272 | if MBTEST(character == '(' && (parser_state & PST_CASEPAT) == 0) /* ) */ | |
3273 | parser_state |= PST_SUBSHELL; | |
3274 | /*(*/ | |
3275 | else if MBTEST((parser_state & PST_CASEPAT) && character == ')') | |
3276 | parser_state &= ~PST_CASEPAT; | |
3277 | /*(*/ | |
3278 | else if MBTEST((parser_state & PST_SUBSHELL) && character == ')') | |
3279 | parser_state &= ~PST_SUBSHELL; | |
3280 | ||
3281 | #if defined (PROCESS_SUBSTITUTION) | |
3282 | /* Check for the constructs which introduce process substitution. | |
3283 | Shells running in `posix mode' don't do process substitution. */ | |
3284 | if MBTEST(posixly_correct || ((character != '>' && character != '<') || peek_char != '(')) /*)*/ | |
3285 | #endif /* PROCESS_SUBSTITUTION */ | |
3286 | return (character); | |
3287 | } | |
3288 | ||
3289 | /* Hack <&- (close stdin) case. Also <&N- (dup and close). */ | |
3290 | if MBTEST(character == '-' && (last_read_token == LESS_AND || last_read_token == GREATER_AND)) | |
3291 | return (character); | |
3292 | ||
3293 | tokword: | |
3294 | /* Okay, if we got this far, we have to read a word. Read one, | |
3295 | and then check it against the known ones. */ | |
3296 | result = read_token_word (character); | |
3297 | #if defined (ALIAS) | |
3298 | if (result == RE_READ_TOKEN) | |
3299 | goto re_read_token; | |
3300 | #endif | |
3301 | return result; | |
3302 | } | |
3303 | ||
3304 | /* | |
3305 | * Match a $(...) or other grouping construct. This has to handle embedded | |
3306 | * quoted strings ('', ``, "") and nested constructs. It also must handle | |
3307 | * reprompting the user, if necessary, after reading a newline, and returning | |
3308 | * correct error values if it reads EOF. | |
3309 | */ | |
3310 | #define P_FIRSTCLOSE 0x0001 | |
3311 | #define P_ALLOWESC 0x0002 | |
3312 | #define P_DQUOTE 0x0004 | |
3313 | #define P_COMMAND 0x0008 /* parsing a command, so look for comments */ | |
3314 | #define P_BACKQUOTE 0x0010 /* parsing a backquoted command substitution */ | |
3315 | #define P_ARRAYSUB 0x0020 /* parsing a [...] array subscript for assignment */ | |
3316 | #define P_DOLBRACE 0x0040 /* parsing a ${...} construct */ | |
3317 | ||
3318 | /* Lexical state while parsing a grouping construct or $(...). */ | |
3319 | #define LEX_WASDOL 0x001 | |
3320 | #define LEX_CKCOMMENT 0x002 | |
3321 | #define LEX_INCOMMENT 0x004 | |
3322 | #define LEX_PASSNEXT 0x008 | |
3323 | #define LEX_RESWDOK 0x010 | |
3324 | #define LEX_CKCASE 0x020 | |
3325 | #define LEX_INCASE 0x040 | |
3326 | #define LEX_INHEREDOC 0x080 | |
3327 | #define LEX_HEREDELIM 0x100 /* reading here-doc delimiter */ | |
3328 | #define LEX_STRIPDOC 0x200 /* <<- strip tabs from here doc delim */ | |
3329 | #define LEX_QUOTEDDOC 0x400 /* here doc with quoted delim */ | |
3330 | #define LEX_INWORD 0x800 | |
3331 | ||
3332 | #define COMSUB_META(ch) ((ch) == ';' || (ch) == '&' || (ch) == '|') | |
3333 | ||
3334 | #define CHECK_NESTRET_ERROR() \ | |
3335 | do { \ | |
3336 | if (nestret == &matched_pair_error) \ | |
3337 | { \ | |
3338 | free (ret); \ | |
3339 | return &matched_pair_error; \ | |
3340 | } \ | |
3341 | } while (0) | |
3342 | ||
3343 | #define APPEND_NESTRET() \ | |
3344 | do { \ | |
3345 | if (nestlen) \ | |
3346 | { \ | |
3347 | RESIZE_MALLOCED_BUFFER (ret, retind, nestlen, retsize, 64); \ | |
3348 | strcpy (ret + retind, nestret); \ | |
3349 | retind += nestlen; \ | |
3350 | } \ | |
3351 | } while (0) | |
3352 | ||
3353 | static char matched_pair_error; | |
3354 | ||
3355 | static char * | |
3356 | parse_matched_pair (qc, open, close, lenp, flags) | |
3357 | int qc; /* `"' if this construct is within double quotes */ | |
3358 | int open, close; | |
3359 | int *lenp, flags; | |
3360 | { | |
3361 | int count, ch, tflags; | |
3362 | int nestlen, ttranslen, start_lineno; | |
3363 | char *ret, *nestret, *ttrans; | |
3364 | int retind, retsize, rflags; | |
3365 | int dolbrace_state; | |
3366 | ||
3367 | dolbrace_state = (flags & P_DOLBRACE) ? DOLBRACE_PARAM : 0; | |
3368 | ||
3369 | /*itrace("parse_matched_pair[%d]: open = %c close = %c flags = %d", line_number, open, close, flags);*/ | |
3370 | count = 1; | |
3371 | tflags = 0; | |
3372 | ||
3373 | if ((flags & P_COMMAND) && qc != '`' && qc != '\'' && qc != '"' && (flags & P_DQUOTE) == 0) | |
3374 | tflags |= LEX_CKCOMMENT; | |
3375 | ||
3376 | /* RFLAGS is the set of flags we want to pass to recursive calls. */ | |
3377 | rflags = (qc == '"') ? P_DQUOTE : (flags & P_DQUOTE); | |
3378 | ||
3379 | ret = (char *)xmalloc (retsize = 64); | |
3380 | retind = 0; | |
3381 | ||
3382 | start_lineno = line_number; | |
3383 | while (count) | |
3384 | { | |
3385 | ch = shell_getc (qc != '\'' && (tflags & (LEX_PASSNEXT)) == 0); | |
3386 | ||
3387 | if (ch == EOF) | |
3388 | { | |
3389 | free (ret); | |
3390 | parser_error (start_lineno, _("unexpected EOF while looking for matching `%c'"), close); | |
3391 | EOF_Reached = 1; /* XXX */ | |
3392 | return (&matched_pair_error); | |
3393 | } | |
3394 | ||
3395 | /* Possible reprompting. */ | |
3396 | if (ch == '\n' && SHOULD_PROMPT ()) | |
3397 | prompt_again (); | |
3398 | ||
3399 | /* Don't bother counting parens or doing anything else if in a comment | |
3400 | or part of a case statement */ | |
3401 | if (tflags & LEX_INCOMMENT) | |
3402 | { | |
3403 | /* Add this character. */ | |
3404 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3405 | ret[retind++] = ch; | |
3406 | ||
3407 | if (ch == '\n') | |
3408 | tflags &= ~LEX_INCOMMENT; | |
3409 | ||
3410 | continue; | |
3411 | } | |
3412 | ||
3413 | /* Not exactly right yet, should handle shell metacharacters, too. If | |
3414 | any changes are made to this test, make analogous changes to subst.c: | |
3415 | extract_delimited_string(). */ | |
3416 | else if MBTEST((tflags & LEX_CKCOMMENT) && (tflags & LEX_INCOMMENT) == 0 && ch == '#' && (retind == 0 || ret[retind-1] == '\n' || shellblank (ret[retind - 1]))) | |
3417 | tflags |= LEX_INCOMMENT; | |
3418 | ||
3419 | if (tflags & LEX_PASSNEXT) /* last char was backslash */ | |
3420 | { | |
3421 | tflags &= ~LEX_PASSNEXT; | |
3422 | if (qc != '\'' && ch == '\n') /* double-quoted \<newline> disappears. */ | |
3423 | { | |
3424 | if (retind > 0) | |
3425 | retind--; /* swallow previously-added backslash */ | |
3426 | continue; | |
3427 | } | |
3428 | ||
3429 | RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64); | |
3430 | if MBTEST(ch == CTLESC) | |
3431 | ret[retind++] = CTLESC; | |
3432 | ret[retind++] = ch; | |
3433 | continue; | |
3434 | } | |
3435 | /* If we're reparsing the input (e.g., from parse_string_to_word_list), | |
3436 | we've already prepended CTLESC to single-quoted results of $'...'. | |
3437 | We may want to do this for other CTLESC-quoted characters in | |
3438 | reparse, too. */ | |
3439 | else if MBTEST((parser_state & PST_REPARSE) && open == '\'' && (ch == CTLESC || ch == CTLNUL)) | |
3440 | { | |
3441 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3442 | ret[retind++] = ch; | |
3443 | continue; | |
3444 | } | |
3445 | else if MBTEST(ch == CTLESC || ch == CTLNUL) /* special shell escapes */ | |
3446 | { | |
3447 | RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64); | |
3448 | ret[retind++] = CTLESC; | |
3449 | ret[retind++] = ch; | |
3450 | continue; | |
3451 | } | |
3452 | else if MBTEST(ch == close) /* ending delimiter */ | |
3453 | count--; | |
3454 | /* handle nested ${...} specially. */ | |
3455 | else if MBTEST(open != close && (tflags & LEX_WASDOL) && open == '{' && ch == open) /* } */ | |
3456 | count++; | |
3457 | else if MBTEST(((flags & P_FIRSTCLOSE) == 0) && ch == open) /* nested begin */ | |
3458 | count++; | |
3459 | ||
3460 | /* Add this character. */ | |
3461 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3462 | ret[retind++] = ch; | |
3463 | ||
3464 | /* If we just read the ending character, don't bother continuing. */ | |
3465 | if (count == 0) | |
3466 | break; | |
3467 | ||
3468 | if (open == '\'') /* '' inside grouping construct */ | |
3469 | { | |
3470 | if MBTEST((flags & P_ALLOWESC) && ch == '\\') | |
3471 | tflags |= LEX_PASSNEXT; | |
3472 | continue; | |
3473 | } | |
3474 | ||
3475 | if MBTEST(ch == '\\') /* backslashes */ | |
3476 | tflags |= LEX_PASSNEXT; | |
3477 | ||
3478 | /* Based on which dolstate is currently in (param, op, or word), | |
3479 | decide what the op is. We're really only concerned if it's % or | |
3480 | #, so we can turn on a flag that says whether or not we should | |
3481 | treat single quotes as special when inside a double-quoted | |
3482 | ${...}. This logic must agree with subst.c:extract_dollar_brace_string | |
3483 | since they share the same defines. */ | |
3484 | /* FLAG POSIX INTERP 221 */ | |
3485 | if (flags & P_DOLBRACE) | |
3486 | { | |
3487 | /* ${param%[%]word} */ | |
3488 | if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '%' && retind > 1) | |
3489 | dolbrace_state = DOLBRACE_QUOTE; | |
3490 | /* ${param#[#]word} */ | |
3491 | else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '#' && retind > 1) | |
3492 | dolbrace_state = DOLBRACE_QUOTE; | |
3493 | /* ${param/[/]pat/rep} */ | |
3494 | else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '/' && retind > 1) | |
3495 | dolbrace_state = DOLBRACE_QUOTE2; /* XXX */ | |
3496 | /* ${param^[^]pat} */ | |
3497 | else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == '^' && retind > 1) | |
3498 | dolbrace_state = DOLBRACE_QUOTE; | |
3499 | /* ${param,[,]pat} */ | |
3500 | else if MBTEST(dolbrace_state == DOLBRACE_PARAM && ch == ',' && retind > 1) | |
3501 | dolbrace_state = DOLBRACE_QUOTE; | |
3502 | else if MBTEST(dolbrace_state == DOLBRACE_PARAM && strchr ("#%^,~:-=?+/", ch) != 0) | |
3503 | dolbrace_state = DOLBRACE_OP; | |
3504 | else if MBTEST(dolbrace_state == DOLBRACE_OP && strchr ("#%^,~:-=?+/", ch) == 0) | |
3505 | dolbrace_state = DOLBRACE_WORD; | |
3506 | } | |
3507 | ||
3508 | /* The big hammer. Single quotes aren't special in double quotes. The | |
3509 | problem is that Posix used to say the single quotes are semi-special: | |
3510 | within a double-quoted ${...} construct "an even number of | |
3511 | unescaped double-quotes or single-quotes, if any, shall occur." */ | |
3512 | /* This was changed in Austin Group Interp 221 */ | |
3513 | if MBTEST(posixly_correct && shell_compatibility_level > 41 && dolbrace_state != DOLBRACE_QUOTE && dolbrace_state != DOLBRACE_QUOTE2 && (flags & P_DQUOTE) && (flags & P_DOLBRACE) && ch == '\'') | |
3514 | continue; | |
3515 | ||
3516 | /* Could also check open == '`' if we want to parse grouping constructs | |
3517 | inside old-style command substitution. */ | |
3518 | if (open != close) /* a grouping construct */ | |
3519 | { | |
3520 | if MBTEST(shellquote (ch)) | |
3521 | { | |
3522 | /* '', ``, or "" inside $(...) or other grouping construct. */ | |
3523 | push_delimiter (dstack, ch); | |
3524 | if MBTEST((tflags & LEX_WASDOL) && ch == '\'') /* $'...' inside group */ | |
3525 | nestret = parse_matched_pair (ch, ch, ch, &nestlen, P_ALLOWESC|rflags); | |
3526 | else | |
3527 | nestret = parse_matched_pair (ch, ch, ch, &nestlen, rflags); | |
3528 | pop_delimiter (dstack); | |
3529 | CHECK_NESTRET_ERROR (); | |
3530 | ||
3531 | if MBTEST((tflags & LEX_WASDOL) && ch == '\'' && (extended_quote || (rflags & P_DQUOTE) == 0)) | |
3532 | { | |
3533 | /* Translate $'...' here. */ | |
3534 | ttrans = ansiexpand (nestret, 0, nestlen - 1, &ttranslen); | |
3535 | xfree (nestret); | |
3536 | ||
3537 | /* If we're parsing a double-quoted brace expansion and we are | |
3538 | not in a place where single quotes are treated specially, | |
3539 | make sure we single-quote the results of the ansi | |
3540 | expansion because quote removal should remove them later */ | |
3541 | /* FLAG POSIX INTERP 221 */ | |
3542 | if ((shell_compatibility_level > 42) && (rflags & P_DQUOTE) && (dolbrace_state == DOLBRACE_QUOTE2) && (flags & P_DOLBRACE)) | |
3543 | { | |
3544 | nestret = sh_single_quote (ttrans); | |
3545 | free (ttrans); | |
3546 | nestlen = strlen (nestret); | |
3547 | } | |
3548 | else if ((rflags & P_DQUOTE) == 0) | |
3549 | { | |
3550 | nestret = sh_single_quote (ttrans); | |
3551 | free (ttrans); | |
3552 | nestlen = strlen (nestret); | |
3553 | } | |
3554 | else | |
3555 | { | |
3556 | nestret = ttrans; | |
3557 | nestlen = ttranslen; | |
3558 | } | |
3559 | retind -= 2; /* back up before the $' */ | |
3560 | } | |
3561 | else if MBTEST((tflags & LEX_WASDOL) && ch == '"' && (extended_quote || (rflags & P_DQUOTE) == 0)) | |
3562 | { | |
3563 | /* Locale expand $"..." here. */ | |
3564 | ttrans = localeexpand (nestret, 0, nestlen - 1, start_lineno, &ttranslen); | |
3565 | xfree (nestret); | |
3566 | ||
3567 | nestret = sh_mkdoublequoted (ttrans, ttranslen, 0); | |
3568 | free (ttrans); | |
3569 | nestlen = ttranslen + 2; | |
3570 | retind -= 2; /* back up before the $" */ | |
3571 | } | |
3572 | ||
3573 | APPEND_NESTRET (); | |
3574 | FREE (nestret); | |
3575 | } | |
3576 | else if ((flags & (P_ARRAYSUB|P_DOLBRACE)) && (tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */ | |
3577 | goto parse_dollar_word; | |
3578 | } | |
3579 | /* Parse an old-style command substitution within double quotes as a | |
3580 | single word. */ | |
3581 | /* XXX - sh and ksh93 don't do this - XXX */ | |
3582 | else if MBTEST(open == '"' && ch == '`') | |
3583 | { | |
3584 | nestret = parse_matched_pair (0, '`', '`', &nestlen, rflags); | |
3585 | ||
3586 | CHECK_NESTRET_ERROR (); | |
3587 | APPEND_NESTRET (); | |
3588 | ||
3589 | FREE (nestret); | |
3590 | } | |
3591 | else if MBTEST(open != '`' && (tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */ | |
3592 | /* check for $(), $[], or ${} inside quoted string. */ | |
3593 | { | |
3594 | parse_dollar_word: | |
3595 | if (open == ch) /* undo previous increment */ | |
3596 | count--; | |
3597 | if (ch == '(') /* ) */ | |
3598 | nestret = parse_comsub (0, '(', ')', &nestlen, (rflags|P_COMMAND) & ~P_DQUOTE); | |
3599 | else if (ch == '{') /* } */ | |
3600 | nestret = parse_matched_pair (0, '{', '}', &nestlen, P_FIRSTCLOSE|P_DOLBRACE|rflags); | |
3601 | else if (ch == '[') /* ] */ | |
3602 | nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags); | |
3603 | ||
3604 | CHECK_NESTRET_ERROR (); | |
3605 | APPEND_NESTRET (); | |
3606 | ||
3607 | FREE (nestret); | |
3608 | } | |
3609 | if MBTEST(ch == '$') | |
3610 | tflags |= LEX_WASDOL; | |
3611 | else | |
3612 | tflags &= ~LEX_WASDOL; | |
3613 | } | |
3614 | ||
3615 | ret[retind] = '\0'; | |
3616 | if (lenp) | |
3617 | *lenp = retind; | |
3618 | /*itrace("parse_matched_pair[%d]: returning %s", line_number, ret);*/ | |
3619 | return ret; | |
3620 | } | |
3621 | ||
3622 | #if defined (DEBUG) | |
3623 | static void | |
3624 | dump_tflags (flags) | |
3625 | int flags; | |
3626 | { | |
3627 | int f; | |
3628 | ||
3629 | f = flags; | |
3630 | fprintf (stderr, "%d -> ", f); | |
3631 | if (f & LEX_WASDOL) | |
3632 | { | |
3633 | f &= ~LEX_WASDOL; | |
3634 | fprintf (stderr, "LEX_WASDOL%s", f ? "|" : ""); | |
3635 | } | |
3636 | if (f & LEX_CKCOMMENT) | |
3637 | { | |
3638 | f &= ~LEX_CKCOMMENT; | |
3639 | fprintf (stderr, "LEX_CKCOMMENT%s", f ? "|" : ""); | |
3640 | } | |
3641 | if (f & LEX_INCOMMENT) | |
3642 | { | |
3643 | f &= ~LEX_INCOMMENT; | |
3644 | fprintf (stderr, "LEX_INCOMMENT%s", f ? "|" : ""); | |
3645 | } | |
3646 | if (f & LEX_PASSNEXT) | |
3647 | { | |
3648 | f &= ~LEX_PASSNEXT; | |
3649 | fprintf (stderr, "LEX_PASSNEXT%s", f ? "|" : ""); | |
3650 | } | |
3651 | if (f & LEX_RESWDOK) | |
3652 | { | |
3653 | f &= ~LEX_RESWDOK; | |
3654 | fprintf (stderr, "LEX_RESWDOK%s", f ? "|" : ""); | |
3655 | } | |
3656 | if (f & LEX_CKCASE) | |
3657 | { | |
3658 | f &= ~LEX_CKCASE; | |
3659 | fprintf (stderr, "LEX_CKCASE%s", f ? "|" : ""); | |
3660 | } | |
3661 | if (f & LEX_INCASE) | |
3662 | { | |
3663 | f &= ~LEX_INCASE; | |
3664 | fprintf (stderr, "LEX_INCASE%s", f ? "|" : ""); | |
3665 | } | |
3666 | if (f & LEX_INHEREDOC) | |
3667 | { | |
3668 | f &= ~LEX_INHEREDOC; | |
3669 | fprintf (stderr, "LEX_INHEREDOC%s", f ? "|" : ""); | |
3670 | } | |
3671 | if (f & LEX_HEREDELIM) | |
3672 | { | |
3673 | f &= ~LEX_HEREDELIM; | |
3674 | fprintf (stderr, "LEX_HEREDELIM%s", f ? "|" : ""); | |
3675 | } | |
3676 | if (f & LEX_STRIPDOC) | |
3677 | { | |
3678 | f &= ~LEX_STRIPDOC; | |
3679 | fprintf (stderr, "LEX_WASDOL%s", f ? "|" : ""); | |
3680 | } | |
3681 | if (f & LEX_QUOTEDDOC) | |
3682 | { | |
3683 | f &= ~LEX_QUOTEDDOC; | |
3684 | fprintf (stderr, "LEX_QUOTEDDOC%s", f ? "|" : ""); | |
3685 | } | |
3686 | if (f & LEX_INWORD) | |
3687 | { | |
3688 | f &= ~LEX_INWORD; | |
3689 | fprintf (stderr, "LEX_INWORD%s", f ? "|" : ""); | |
3690 | } | |
3691 | ||
3692 | fprintf (stderr, "\n"); | |
3693 | fflush (stderr); | |
3694 | } | |
3695 | #endif | |
3696 | ||
3697 | /* Parse a $(...) command substitution. This is messier than I'd like, and | |
3698 | reproduces a lot more of the token-reading code than I'd like. */ | |
3699 | static char * | |
3700 | parse_comsub (qc, open, close, lenp, flags) | |
3701 | int qc; /* `"' if this construct is within double quotes */ | |
3702 | int open, close; | |
3703 | int *lenp, flags; | |
3704 | { | |
3705 | int count, ch, peekc, tflags, lex_rwlen, lex_wlen, lex_firstind; | |
3706 | int nestlen, ttranslen, start_lineno; | |
3707 | char *ret, *nestret, *ttrans, *heredelim; | |
3708 | int retind, retsize, rflags, hdlen; | |
3709 | ||
3710 | /* Posix interp 217 says arithmetic expressions have precedence, so | |
3711 | assume $(( introduces arithmetic expansion and parse accordingly. */ | |
3712 | peekc = shell_getc (0); | |
3713 | shell_ungetc (peekc); | |
3714 | if (peekc == '(') | |
3715 | return (parse_matched_pair (qc, open, close, lenp, 0)); | |
3716 | ||
3717 | /*itrace("parse_comsub: qc = `%c' open = %c close = %c", qc, open, close);*/ | |
3718 | count = 1; | |
3719 | tflags = LEX_RESWDOK; | |
3720 | ||
3721 | if ((flags & P_COMMAND) && qc != '\'' && qc != '"' && (flags & P_DQUOTE) == 0) | |
3722 | tflags |= LEX_CKCASE; | |
3723 | if ((tflags & LEX_CKCASE) && (interactive == 0 || interactive_comments)) | |
3724 | tflags |= LEX_CKCOMMENT; | |
3725 | ||
3726 | /* RFLAGS is the set of flags we want to pass to recursive calls. */ | |
3727 | rflags = (flags & P_DQUOTE); | |
3728 | ||
3729 | ret = (char *)xmalloc (retsize = 64); | |
3730 | retind = 0; | |
3731 | ||
3732 | start_lineno = line_number; | |
3733 | lex_rwlen = lex_wlen = 0; | |
3734 | ||
3735 | heredelim = 0; | |
3736 | lex_firstind = -1; | |
3737 | ||
3738 | while (count) | |
3739 | { | |
3740 | comsub_readchar: | |
3741 | ch = shell_getc (qc != '\'' && (tflags & (LEX_INCOMMENT|LEX_PASSNEXT)) == 0); | |
3742 | ||
3743 | if (ch == EOF) | |
3744 | { | |
3745 | eof_error: | |
3746 | free (ret); | |
3747 | FREE (heredelim); | |
3748 | parser_error (start_lineno, _("unexpected EOF while looking for matching `%c'"), close); | |
3749 | EOF_Reached = 1; /* XXX */ | |
3750 | return (&matched_pair_error); | |
3751 | } | |
3752 | ||
3753 | /* If we hit the end of a line and are reading the contents of a here | |
3754 | document, and it's not the same line that the document starts on, | |
3755 | check for this line being the here doc delimiter. Otherwise, if | |
3756 | we're in a here document, mark the next character as the beginning | |
3757 | of a line. */ | |
3758 | if (ch == '\n') | |
3759 | { | |
3760 | if ((tflags & LEX_HEREDELIM) && heredelim) | |
3761 | { | |
3762 | tflags &= ~LEX_HEREDELIM; | |
3763 | tflags |= LEX_INHEREDOC; | |
3764 | lex_firstind = retind + 1; | |
3765 | } | |
3766 | else if (tflags & LEX_INHEREDOC) | |
3767 | { | |
3768 | int tind; | |
3769 | tind = lex_firstind; | |
3770 | while ((tflags & LEX_STRIPDOC) && ret[tind] == '\t') | |
3771 | tind++; | |
3772 | if (STREQN (ret + tind, heredelim, hdlen)) | |
3773 | { | |
3774 | tflags &= ~(LEX_STRIPDOC|LEX_INHEREDOC|LEX_QUOTEDDOC); | |
3775 | /*itrace("parse_comsub:%d: found here doc end `%s'", line_number, ret + tind);*/ | |
3776 | free (heredelim); | |
3777 | heredelim = 0; | |
3778 | lex_firstind = -1; | |
3779 | } | |
3780 | else | |
3781 | lex_firstind = retind + 1; | |
3782 | } | |
3783 | } | |
3784 | ||
3785 | /* Possible reprompting. */ | |
3786 | if (ch == '\n' && SHOULD_PROMPT ()) | |
3787 | prompt_again (); | |
3788 | ||
3789 | /* XXX -- possibly allow here doc to be delimited by ending right | |
3790 | paren. */ | |
3791 | if ((tflags & LEX_INHEREDOC) && ch == close && count == 1) | |
3792 | { | |
3793 | int tind; | |
3794 | /*itrace("parse_comsub:%d: in here doc, ch == close, retind - firstind = %d hdlen = %d retind = %d", line_number, retind-lex_firstind, hdlen, retind);*/ | |
3795 | tind = lex_firstind; | |
3796 | while ((tflags & LEX_STRIPDOC) && ret[tind] == '\t') | |
3797 | tind++; | |
3798 | if (retind-tind == hdlen && STREQN (ret + tind, heredelim, hdlen)) | |
3799 | { | |
3800 | tflags &= ~(LEX_STRIPDOC|LEX_INHEREDOC|LEX_QUOTEDDOC); | |
3801 | /*itrace("parse_comsub:%d: found here doc end `%*s'", line_number, hdlen, ret + tind);*/ | |
3802 | free (heredelim); | |
3803 | heredelim = 0; | |
3804 | lex_firstind = -1; | |
3805 | } | |
3806 | } | |
3807 | ||
3808 | /* Don't bother counting parens or doing anything else if in a comment or | |
3809 | here document (not exactly right for here-docs -- if we want to allow | |
3810 | recursive calls to parse_comsub to have their own here documents, | |
3811 | change the LEX_INHEREDOC to LEX_QUOTEDDOC here and uncomment the next | |
3812 | clause below. Note that to make this work completely, we need to make | |
3813 | additional changes to allow xparse_dolparen to work right when the | |
3814 | command substitution is parsed, because read_secondary_line doesn't know | |
3815 | to recursively parse through command substitutions embedded in here- | |
3816 | documents */ | |
3817 | if (tflags & (LEX_INCOMMENT|LEX_INHEREDOC)) | |
3818 | { | |
3819 | /* Add this character. */ | |
3820 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3821 | ret[retind++] = ch; | |
3822 | ||
3823 | if ((tflags & LEX_INCOMMENT) && ch == '\n') | |
3824 | { | |
3825 | /*itrace("parse_comsub:%d: lex_incomment -> 0 ch = `%c'", line_number, ch);*/ | |
3826 | tflags &= ~LEX_INCOMMENT; | |
3827 | } | |
3828 | ||
3829 | continue; | |
3830 | } | |
3831 | #if 0 | |
3832 | /* If we're going to recursively parse a command substitution inside a | |
3833 | here-document, make sure we call parse_comsub recursively below. See | |
3834 | above for additional caveats. */ | |
3835 | if ((tflags & LEX_INHEREDOC) && ((tflags & LEX_WASDOL) == 0 || ch != '(')) /*)*/ | |
3836 | { | |
3837 | /* Add this character. */ | |
3838 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3839 | ret[retind++] = ch; | |
3840 | if MBTEST(ch == '$') | |
3841 | tflags |= LEX_WASDOL; | |
3842 | else | |
3843 | tflags &= ~LEX_WASDOL; | |
3844 | } | |
3845 | #endif | |
3846 | ||
3847 | if (tflags & LEX_PASSNEXT) /* last char was backslash */ | |
3848 | { | |
3849 | /*itrace("parse_comsub:%d: lex_passnext -> 0 ch = `%c' (%d)", line_number, ch, __LINE__);*/ | |
3850 | tflags &= ~LEX_PASSNEXT; | |
3851 | if (qc != '\'' && ch == '\n') /* double-quoted \<newline> disappears. */ | |
3852 | { | |
3853 | if (retind > 0) | |
3854 | retind--; /* swallow previously-added backslash */ | |
3855 | continue; | |
3856 | } | |
3857 | ||
3858 | RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64); | |
3859 | if MBTEST(ch == CTLESC) | |
3860 | ret[retind++] = CTLESC; | |
3861 | ret[retind++] = ch; | |
3862 | continue; | |
3863 | } | |
3864 | ||
3865 | /* If this is a shell break character, we are not in a word. If not, | |
3866 | we either start or continue a word. */ | |
3867 | if MBTEST(shellbreak (ch)) | |
3868 | { | |
3869 | tflags &= ~LEX_INWORD; | |
3870 | /*itrace("parse_comsub:%d: lex_inword -> 0 ch = `%c' (%d)", line_number, ch, __LINE__);*/ | |
3871 | } | |
3872 | else | |
3873 | { | |
3874 | if (tflags & LEX_INWORD) | |
3875 | { | |
3876 | lex_wlen++; | |
3877 | /*itrace("parse_comsub:%d: lex_inword == 1 ch = `%c' lex_wlen = %d (%d)", line_number, ch, lex_wlen, __LINE__);*/ | |
3878 | } | |
3879 | else | |
3880 | { | |
3881 | /*itrace("parse_comsub:%d: lex_inword -> 1 ch = `%c' (%d)", line_number, ch, __LINE__);*/ | |
3882 | tflags |= LEX_INWORD; | |
3883 | lex_wlen = 0; | |
3884 | if (tflags & LEX_RESWDOK) | |
3885 | lex_rwlen = 0; | |
3886 | } | |
3887 | } | |
3888 | ||
3889 | /* Skip whitespace */ | |
3890 | if MBTEST(shellblank (ch) && (tflags & LEX_HEREDELIM) == 0 && lex_rwlen == 0) | |
3891 | { | |
3892 | /* Add this character. */ | |
3893 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3894 | ret[retind++] = ch; | |
3895 | continue; | |
3896 | } | |
3897 | ||
3898 | /* Either we are looking for the start of the here-doc delimiter | |
3899 | (lex_firstind == -1) or we are reading one (lex_firstind >= 0). | |
3900 | If this character is a shell break character and we are reading | |
3901 | the delimiter, save it and note that we are now reading a here | |
3902 | document. If we've found the start of the delimiter, note it by | |
3903 | setting lex_firstind. Backslashes can quote shell metacharacters | |
3904 | in here-doc delimiters. */ | |
3905 | if (tflags & LEX_HEREDELIM) | |
3906 | { | |
3907 | if (lex_firstind == -1 && shellbreak (ch) == 0) | |
3908 | lex_firstind = retind; | |
3909 | #if 0 | |
3910 | else if (heredelim && (tflags & LEX_PASSNEXT) == 0 && ch == '\n') | |
3911 | { | |
3912 | tflags |= LEX_INHEREDOC; | |
3913 | tflags &= ~LEX_HEREDELIM; | |
3914 | lex_firstind = retind + 1; | |
3915 | } | |
3916 | #endif | |
3917 | else if (lex_firstind >= 0 && (tflags & LEX_PASSNEXT) == 0 && shellbreak (ch)) | |
3918 | { | |
3919 | if (heredelim == 0) | |
3920 | { | |
3921 | nestret = substring (ret, lex_firstind, retind); | |
3922 | heredelim = string_quote_removal (nestret, 0); | |
3923 | hdlen = STRLEN(heredelim); | |
3924 | /*itrace("parse_comsub:%d: found here doc delimiter `%s' (%d)", line_number, heredelim, hdlen);*/ | |
3925 | if (STREQ (heredelim, nestret) == 0) | |
3926 | tflags |= LEX_QUOTEDDOC; | |
3927 | free (nestret); | |
3928 | } | |
3929 | if (ch == '\n') | |
3930 | { | |
3931 | tflags |= LEX_INHEREDOC; | |
3932 | tflags &= ~LEX_HEREDELIM; | |
3933 | lex_firstind = retind + 1; | |
3934 | } | |
3935 | else | |
3936 | lex_firstind = -1; | |
3937 | } | |
3938 | } | |
3939 | ||
3940 | /* Meta-characters that can introduce a reserved word. Not perfect yet. */ | |
3941 | if MBTEST((tflags & LEX_RESWDOK) == 0 && (tflags & LEX_CKCASE) && (tflags & LEX_INCOMMENT) == 0 && (shellmeta(ch) || ch == '\n')) | |
3942 | { | |
3943 | /* Add this character. */ | |
3944 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3945 | ret[retind++] = ch; | |
3946 | peekc = shell_getc (1); | |
3947 | if (ch == peekc && (ch == '&' || ch == '|' || ch == ';')) /* two-character tokens */ | |
3948 | { | |
3949 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3950 | ret[retind++] = peekc; | |
3951 | /*itrace("parse_comsub:%d: set lex_reswordok = 1, ch = `%c'", line_number, ch);*/ | |
3952 | tflags |= LEX_RESWDOK; | |
3953 | lex_rwlen = 0; | |
3954 | continue; | |
3955 | } | |
3956 | else if (ch == '\n' || COMSUB_META(ch)) | |
3957 | { | |
3958 | shell_ungetc (peekc); | |
3959 | /*itrace("parse_comsub:%d: set lex_reswordok = 1, ch = `%c'", line_number, ch);*/ | |
3960 | tflags |= LEX_RESWDOK; | |
3961 | lex_rwlen = 0; | |
3962 | continue; | |
3963 | } | |
3964 | else if (ch == EOF) | |
3965 | goto eof_error; | |
3966 | else | |
3967 | { | |
3968 | /* `unget' the character we just added and fall through */ | |
3969 | retind--; | |
3970 | shell_ungetc (peekc); | |
3971 | } | |
3972 | } | |
3973 | ||
3974 | /* If we can read a reserved word, try to read one. */ | |
3975 | if (tflags & LEX_RESWDOK) | |
3976 | { | |
3977 | if MBTEST(islower ((unsigned char)ch)) | |
3978 | { | |
3979 | /* Add this character. */ | |
3980 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
3981 | ret[retind++] = ch; | |
3982 | lex_rwlen++; | |
3983 | continue; | |
3984 | } | |
3985 | else if MBTEST(lex_rwlen == 4 && shellbreak (ch)) | |
3986 | { | |
3987 | if (STREQN (ret + retind - 4, "case", 4)) | |
3988 | { | |
3989 | tflags |= LEX_INCASE; | |
3990 | tflags &= ~LEX_RESWDOK; | |
3991 | /*itrace("parse_comsub:%d: found `case', lex_incase -> 1 lex_reswdok -> 0", line_number);*/ | |
3992 | } | |
3993 | else if (STREQN (ret + retind - 4, "esac", 4)) | |
3994 | { | |
3995 | tflags &= ~LEX_INCASE; | |
3996 | /*itrace("parse_comsub:%d: found `esac', lex_incase -> 0 lex_reswdok -> 1", line_number);*/ | |
3997 | tflags |= LEX_RESWDOK; | |
3998 | lex_rwlen = 0; | |
3999 | } | |
4000 | else if (STREQN (ret + retind - 4, "done", 4) || | |
4001 | STREQN (ret + retind - 4, "then", 4) || | |
4002 | STREQN (ret + retind - 4, "else", 4) || | |
4003 | STREQN (ret + retind - 4, "elif", 4) || | |
4004 | STREQN (ret + retind - 4, "time", 4)) | |
4005 | { | |
4006 | /* these are four-character reserved words that can be | |
4007 | followed by a reserved word; anything else turns off | |
4008 | the reserved-word-ok flag */ | |
4009 | /*itrace("parse_comsub:%d: found `%.4s', lex_reswdok -> 1", line_number, ret+retind-4);*/ | |
4010 | tflags |= LEX_RESWDOK; | |
4011 | lex_rwlen = 0; | |
4012 | } | |
4013 | else | |
4014 | { | |
4015 | tflags &= ~LEX_RESWDOK; | |
4016 | /*itrace("parse_comsub:%d: found `%.4s', lex_reswdok -> 0", line_number, ret+retind-4);*/ | |
4017 | } | |
4018 | } | |
4019 | else if MBTEST((tflags & LEX_CKCOMMENT) && ch == '#' && (lex_rwlen == 0 || ((tflags & LEX_INWORD) && lex_wlen == 0))) | |
4020 | ; /* don't modify LEX_RESWDOK if we're starting a comment */ | |
4021 | /* Allow `do' followed by space, tab, or newline to preserve the | |
4022 | RESWDOK flag, but reset the reserved word length counter so we | |
4023 | can read another one. */ | |
4024 | else if MBTEST(((tflags & LEX_INCASE) == 0) && | |
4025 | (isblank((unsigned char)ch) || ch == '\n') && | |
4026 | lex_rwlen == 2 && | |
4027 | STREQN (ret + retind - 2, "do", 2)) | |
4028 | { | |
4029 | /*itrace("parse_comsub:%d: lex_incase == 0 found `%c', found \"do\"", line_number, ch);*/ | |
4030 | lex_rwlen = 0; | |
4031 | } | |
4032 | else if MBTEST((tflags & LEX_INCASE) && ch != '\n') | |
4033 | /* If we can read a reserved word and we're in case, we're at the | |
4034 | point where we can read a new pattern list or an esac. We | |
4035 | handle the esac case above. If we read a newline, we want to | |
4036 | leave LEX_RESWDOK alone. If we read anything else, we want to | |
4037 | turn off LEX_RESWDOK, since we're going to read a pattern list. */ | |
4038 | { | |
4039 | tflags &= ~LEX_RESWDOK; | |
4040 | /*itrace("parse_comsub:%d: lex_incase == 1 found `%c', lex_reswordok -> 0", line_number, ch);*/ | |
4041 | } | |
4042 | else if MBTEST(shellbreak (ch) == 0) | |
4043 | { | |
4044 | tflags &= ~LEX_RESWDOK; | |
4045 | /*itrace("parse_comsub:%d: found `%c', lex_reswordok -> 0", line_number, ch);*/ | |
4046 | } | |
4047 | #if 0 | |
4048 | /* If we find a space or tab but have read something and it's not | |
4049 | `do', turn off the reserved-word-ok flag */ | |
4050 | else if MBTEST(isblank ((unsigned char)ch) && lex_rwlen > 0) | |
4051 | { | |
4052 | tflags &= ~LEX_RESWDOK; | |
4053 | /*itrace("parse_comsub:%d: found `%c', lex_reswordok -> 0", line_number, ch);*/ | |
4054 | } | |
4055 | #endif | |
4056 | } | |
4057 | ||
4058 | /* Might be the start of a here-doc delimiter */ | |
4059 | if MBTEST((tflags & LEX_INCOMMENT) == 0 && (tflags & LEX_CKCASE) && ch == '<') | |
4060 | { | |
4061 | /* Add this character. */ | |
4062 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
4063 | ret[retind++] = ch; | |
4064 | peekc = shell_getc (1); | |
4065 | if (peekc == EOF) | |
4066 | goto eof_error; | |
4067 | if (peekc == ch) | |
4068 | { | |
4069 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
4070 | ret[retind++] = peekc; | |
4071 | peekc = shell_getc (1); | |
4072 | if (peekc == EOF) | |
4073 | goto eof_error; | |
4074 | if (peekc == '-') | |
4075 | { | |
4076 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
4077 | ret[retind++] = peekc; | |
4078 | tflags |= LEX_STRIPDOC; | |
4079 | } | |
4080 | else | |
4081 | shell_ungetc (peekc); | |
4082 | if (peekc != '<') | |
4083 | { | |
4084 | tflags |= LEX_HEREDELIM; | |
4085 | lex_firstind = -1; | |
4086 | } | |
4087 | continue; | |
4088 | } | |
4089 | else | |
4090 | ch = peekc; /* fall through and continue XXX */ | |
4091 | } | |
4092 | else if MBTEST((tflags & LEX_CKCOMMENT) && (tflags & LEX_INCOMMENT) == 0 && ch == '#' && (((tflags & LEX_RESWDOK) && lex_rwlen == 0) || ((tflags & LEX_INWORD) && lex_wlen == 0))) | |
4093 | { | |
4094 | /*itrace("parse_comsub:%d: lex_incomment -> 1 (%d)", line_number, __LINE__);*/ | |
4095 | tflags |= LEX_INCOMMENT; | |
4096 | } | |
4097 | ||
4098 | if MBTEST(ch == CTLESC || ch == CTLNUL) /* special shell escapes */ | |
4099 | { | |
4100 | RESIZE_MALLOCED_BUFFER (ret, retind, 2, retsize, 64); | |
4101 | ret[retind++] = CTLESC; | |
4102 | ret[retind++] = ch; | |
4103 | continue; | |
4104 | } | |
4105 | #if 0 | |
4106 | else if MBTEST((tflags & LEX_INCASE) && ch == close && close == ')') | |
4107 | tflags &= ~LEX_INCASE; /* XXX */ | |
4108 | #endif | |
4109 | else if MBTEST(ch == close && (tflags & LEX_INCASE) == 0) /* ending delimiter */ | |
4110 | { | |
4111 | count--; | |
4112 | /*itrace("parse_comsub:%d: found close: count = %d", line_number, count);*/ | |
4113 | } | |
4114 | else if MBTEST(((flags & P_FIRSTCLOSE) == 0) && (tflags & LEX_INCASE) == 0 && ch == open) /* nested begin */ | |
4115 | { | |
4116 | count++; | |
4117 | /*itrace("parse_comsub:%d: found open: count = %d", line_number, count);*/ | |
4118 | } | |
4119 | ||
4120 | /* Add this character. */ | |
4121 | RESIZE_MALLOCED_BUFFER (ret, retind, 1, retsize, 64); | |
4122 | ret[retind++] = ch; | |
4123 | ||
4124 | /* If we just read the ending character, don't bother continuing. */ | |
4125 | if (count == 0) | |
4126 | break; | |
4127 | ||
4128 | if MBTEST(ch == '\\') /* backslashes */ | |
4129 | tflags |= LEX_PASSNEXT; | |
4130 | ||
4131 | if MBTEST(shellquote (ch)) | |
4132 | { | |
4133 | /* '', ``, or "" inside $(...). */ | |
4134 | push_delimiter (dstack, ch); | |
4135 | if MBTEST((tflags & LEX_WASDOL) && ch == '\'') /* $'...' inside group */ | |
4136 | nestret = parse_matched_pair (ch, ch, ch, &nestlen, P_ALLOWESC|rflags); | |
4137 | else | |
4138 | nestret = parse_matched_pair (ch, ch, ch, &nestlen, rflags); | |
4139 | pop_delimiter (dstack); | |
4140 | CHECK_NESTRET_ERROR (); | |
4141 | ||
4142 | if MBTEST((tflags & LEX_WASDOL) && ch == '\'' && (extended_quote || (rflags & P_DQUOTE) == 0)) | |
4143 | { | |
4144 | /* Translate $'...' here. */ | |
4145 | ttrans = ansiexpand (nestret, 0, nestlen - 1, &ttranslen); | |
4146 | xfree (nestret); | |
4147 | ||
4148 | if ((rflags & P_DQUOTE) == 0) | |
4149 | { | |
4150 | nestret = sh_single_quote (ttrans); | |
4151 | free (ttrans); | |
4152 | nestlen = strlen (nestret); | |
4153 | } | |
4154 | else | |
4155 | { | |
4156 | nestret = ttrans; | |
4157 | nestlen = ttranslen; | |
4158 | } | |
4159 | retind -= 2; /* back up before the $' */ | |
4160 | } | |
4161 | else if MBTEST((tflags & LEX_WASDOL) && ch == '"' && (extended_quote || (rflags & P_DQUOTE) == 0)) | |
4162 | { | |
4163 | /* Locale expand $"..." here. */ | |
4164 | ttrans = localeexpand (nestret, 0, nestlen - 1, start_lineno, &ttranslen); | |
4165 | xfree (nestret); | |
4166 | ||
4167 | nestret = sh_mkdoublequoted (ttrans, ttranslen, 0); | |
4168 | free (ttrans); | |
4169 | nestlen = ttranslen + 2; | |
4170 | retind -= 2; /* back up before the $" */ | |
4171 | } | |
4172 | ||
4173 | APPEND_NESTRET (); | |
4174 | FREE (nestret); | |
4175 | } | |
4176 | else if MBTEST((tflags & LEX_WASDOL) && (ch == '(' || ch == '{' || ch == '[')) /* ) } ] */ | |
4177 | /* check for $(), $[], or ${} inside command substitution. */ | |
4178 | { | |
4179 | if ((tflags & LEX_INCASE) == 0 && open == ch) /* undo previous increment */ | |
4180 | count--; | |
4181 | if (ch == '(') /* ) */ | |
4182 | nestret = parse_comsub (0, '(', ')', &nestlen, (rflags|P_COMMAND) & ~P_DQUOTE); | |
4183 | else if (ch == '{') /* } */ | |
4184 | nestret = parse_matched_pair (0, '{', '}', &nestlen, P_FIRSTCLOSE|P_DOLBRACE|rflags); | |
4185 | else if (ch == '[') /* ] */ | |
4186 | nestret = parse_matched_pair (0, '[', ']', &nestlen, rflags); | |
4187 | ||
4188 | CHECK_NESTRET_ERROR (); | |
4189 | APPEND_NESTRET (); | |
4190 | ||
4191 | FREE (nestret); | |
4192 | } | |
4193 | if MBTEST(ch == '$') | |
4194 | tflags |= LEX_WASDOL; | |
4195 | else | |
4196 | tflags &= ~LEX_WASDOL; | |
4197 | } | |
4198 | ||
4199 | FREE (heredelim); | |
4200 | ret[retind] = '\0'; | |
4201 | if (lenp) | |
4202 | *lenp = retind; | |
4203 | /*itrace("parse_comsub:%d: returning `%s'", line_number, ret);*/ | |
4204 | return ret; | |
4205 | } | |
4206 | ||
4207 | /* Recursively call the parser to parse a $(...) command substitution. */ | |
4208 | char * | |
4209 | xparse_dolparen (base, string, indp, flags) | |
4210 | char *base; | |
4211 | char *string; | |
4212 | int *indp; | |
4213 | int flags; | |
4214 | { | |
4215 | sh_parser_state_t ps; | |
4216 | sh_input_line_state_t ls; | |
4217 | int orig_ind, nc, sflags, orig_eof_token; | |
4218 | char *ret, *s, *ep, *ostring; | |
4219 | ||
4220 | /*yydebug = 1;*/ | |
4221 | orig_ind = *indp; | |
4222 | ostring = string; | |
4223 | ||
4224 | /*itrace("xparse_dolparen: size = %d shell_input_line = `%s'", shell_input_line_size, shell_input_line);*/ | |
4225 | sflags = SEVAL_NONINT|SEVAL_NOHIST|SEVAL_NOFREE; | |
4226 | if (flags & SX_NOLONGJMP) | |
4227 | sflags |= SEVAL_NOLONGJMP; | |
4228 | save_parser_state (&ps); | |
4229 | save_input_line_state (&ls); | |
4230 | orig_eof_token = shell_eof_token; | |
4231 | ||
4232 | /*(*/ | |
4233 | parser_state |= PST_CMDSUBST|PST_EOFTOKEN; /* allow instant ')' */ /*(*/ | |
4234 | shell_eof_token = ')'; | |
4235 | ||
4236 | nc = parse_string (string, "command substitution", sflags, &ep); | |
4237 | ||
4238 | shell_eof_token = orig_eof_token; | |
4239 | restore_parser_state (&ps); | |
4240 | reset_parser (); | |
4241 | /* reset_parser clears shell_input_line and associated variables */ | |
4242 | restore_input_line_state (&ls); | |
4243 | ||
4244 | token_to_read = 0; | |
4245 | ||
4246 | /* If parse_string returns < 0, we need to jump to top level with the | |
4247 | negative of the return value */ | |
4248 | if (nc < 0) | |
4249 | jump_to_top_level (-nc); /* XXX */ | |
4250 | ||
4251 | /* Need to find how many characters parse_and_execute consumed, update | |
4252 | *indp, if flags != 0, copy the portion of the string parsed into RET | |
4253 | and return it. If flags & 1 (EX_NOALLOC) we can return NULL. */ | |
4254 | ||
4255 | /*(*/ | |
4256 | if (ep[-1] != ')') | |
4257 | { | |
4258 | #if DEBUG | |
4259 | if (ep[-1] != '\n') | |
4260 | itrace("xparse_dolparen:%d: ep[-1] != RPAREN (%d), ep = `%s'", line_number, ep[-1], ep); | |
4261 | #endif | |
4262 | while (ep > ostring && ep[-1] == '\n') ep--; | |
4263 | } | |
4264 | ||
4265 | nc = ep - ostring; | |
4266 | *indp = ep - base - 1; | |
4267 | ||
4268 | /*(*/ | |
4269 | #if DEBUG | |
4270 | if (base[*indp] != ')') | |
4271 | itrace("xparse_dolparen:%d: base[%d] != RPAREN (%d), base = `%s'", line_number, *indp, base[*indp], base); | |
4272 | #endif | |
4273 | ||
4274 | if (flags & SX_NOALLOC) | |
4275 | return (char *)NULL; | |
4276 | ||
4277 | if (nc == 0) | |
4278 | { | |
4279 | ret = xmalloc (1); | |
4280 | ret[0] = '\0'; | |
4281 | } | |
4282 | else | |
4283 | ret = substring (ostring, 0, nc - 1); | |
4284 | ||
4285 | return ret; | |
4286 | } | |
4287 | ||
4288 | #if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND) | |
4289 | /* Parse a double-paren construct. It can be either an arithmetic | |
4290 | command, an arithmetic `for' command, or a nested subshell. Returns | |
4291 | the parsed token, -1 on error, or -2 if we didn't do anything and | |
4292 | should just go on. */ | |
4293 | static int | |
4294 | parse_dparen (c) | |
4295 | int c; | |
4296 | { | |
4297 | int cmdtyp, sline; | |
4298 | char *wval; | |
4299 | WORD_DESC *wd; | |
4300 | ||
4301 | #if defined (ARITH_FOR_COMMAND) | |
4302 | if (last_read_token == FOR) | |
4303 | { | |
4304 | arith_for_lineno = line_number; | |
4305 | cmdtyp = parse_arith_cmd (&wval, 0); | |
4306 | if (cmdtyp == 1) | |
4307 | { | |
4308 | wd = alloc_word_desc (); | |
4309 | wd->word = wval; | |
4310 | yylval.word_list = make_word_list (wd, (WORD_LIST *)NULL); | |
4311 | return (ARITH_FOR_EXPRS); | |
4312 | } | |
4313 | else | |
4314 | return -1; /* ERROR */ | |
4315 | } | |
4316 | #endif | |
4317 | ||
4318 | #if defined (DPAREN_ARITHMETIC) | |
4319 | if (reserved_word_acceptable (last_read_token)) | |
4320 | { | |
4321 | sline = line_number; | |
4322 | ||
4323 | cmdtyp = parse_arith_cmd (&wval, 0); | |
4324 | if (cmdtyp == 1) /* arithmetic command */ | |
4325 | { | |
4326 | wd = alloc_word_desc (); | |
4327 | wd->word = wval; | |
4328 | wd->flags = W_QUOTED|W_NOSPLIT|W_NOGLOB|W_DQUOTE; | |
4329 | yylval.word_list = make_word_list (wd, (WORD_LIST *)NULL); | |
4330 | return (ARITH_CMD); | |
4331 | } | |
4332 | else if (cmdtyp == 0) /* nested subshell */ | |
4333 | { | |
4334 | push_string (wval, 0, (alias_t *)NULL); | |
4335 | pushed_string_list->flags = PSH_DPAREN; | |
4336 | if ((parser_state & PST_CASEPAT) == 0) | |
4337 | parser_state |= PST_SUBSHELL; | |
4338 | return (c); | |
4339 | } | |
4340 | else /* ERROR */ | |
4341 | return -1; | |
4342 | } | |
4343 | #endif | |
4344 | ||
4345 | return -2; /* XXX */ | |
4346 | } | |
4347 | ||
4348 | /* We've seen a `(('. Look for the matching `))'. If we get it, return 1. | |
4349 | If not, assume it's a nested subshell for backwards compatibility and | |
4350 | return 0. In any case, put the characters we've consumed into a locally- | |
4351 | allocated buffer and make *ep point to that buffer. Return -1 on an | |
4352 | error, for example EOF. */ | |
4353 | static int | |
4354 | parse_arith_cmd (ep, adddq) | |
4355 | char **ep; | |
4356 | int adddq; | |
4357 | { | |
4358 | int exp_lineno, rval, c; | |
4359 | char *ttok, *tokstr; | |
4360 | int ttoklen; | |
4361 | ||
4362 | exp_lineno = line_number; | |
4363 | ttok = parse_matched_pair (0, '(', ')', &ttoklen, 0); | |
4364 | rval = 1; | |
4365 | if (ttok == &matched_pair_error) | |
4366 | return -1; | |
4367 | /* Check that the next character is the closing right paren. If | |
4368 | not, this is a syntax error. ( */ | |
4369 | c = shell_getc (0); | |
4370 | if MBTEST(c != ')') | |
4371 | rval = 0; | |
4372 | ||
4373 | tokstr = (char *)xmalloc (ttoklen + 4); | |
4374 | ||
4375 | /* if ADDDQ != 0 then (( ... )) -> "..." */ | |
4376 | if (rval == 1 && adddq) /* arith cmd, add double quotes */ | |
4377 | { | |
4378 | tokstr[0] = '"'; | |
4379 | strncpy (tokstr + 1, ttok, ttoklen - 1); | |
4380 | tokstr[ttoklen] = '"'; | |
4381 | tokstr[ttoklen+1] = '\0'; | |
4382 | } | |
4383 | else if (rval == 1) /* arith cmd, don't add double quotes */ | |
4384 | { | |
4385 | strncpy (tokstr, ttok, ttoklen - 1); | |
4386 | tokstr[ttoklen-1] = '\0'; | |
4387 | } | |
4388 | else /* nested subshell */ | |
4389 | { | |
4390 | tokstr[0] = '('; | |
4391 | strncpy (tokstr + 1, ttok, ttoklen - 1); | |
4392 | tokstr[ttoklen] = ')'; | |
4393 | tokstr[ttoklen+1] = c; | |
4394 | tokstr[ttoklen+2] = '\0'; | |
4395 | } | |
4396 | ||
4397 | *ep = tokstr; | |
4398 | FREE (ttok); | |
4399 | return rval; | |
4400 | } | |
4401 | #endif /* DPAREN_ARITHMETIC || ARITH_FOR_COMMAND */ | |
4402 | ||
4403 | #if defined (COND_COMMAND) | |
4404 | static void | |
4405 | cond_error () | |
4406 | { | |
4407 | char *etext; | |
4408 | ||
4409 | if (EOF_Reached && cond_token != COND_ERROR) /* [[ */ | |
4410 | parser_error (cond_lineno, _("unexpected EOF while looking for `]]'")); | |
4411 | else if (cond_token != COND_ERROR) | |
4412 | { | |
4413 | if (etext = error_token_from_token (cond_token)) | |
4414 | { | |
4415 | parser_error (cond_lineno, _("syntax error in conditional expression: unexpected token `%s'"), etext); | |
4416 | free (etext); | |
4417 | } | |
4418 | else | |
4419 | parser_error (cond_lineno, _("syntax error in conditional expression")); | |
4420 | } | |
4421 | } | |
4422 | ||
4423 | static COND_COM * | |
4424 | cond_expr () | |
4425 | { | |
4426 | return (cond_or ()); | |
4427 | } | |
4428 | ||
4429 | static COND_COM * | |
4430 | cond_or () | |
4431 | { | |
4432 | COND_COM *l, *r; | |
4433 | ||
4434 | l = cond_and (); | |
4435 | if (cond_token == OR_OR) | |
4436 | { | |
4437 | r = cond_or (); | |
4438 | l = make_cond_node (COND_OR, (WORD_DESC *)NULL, l, r); | |
4439 | } | |
4440 | return l; | |
4441 | } | |
4442 | ||
4443 | static COND_COM * | |
4444 | cond_and () | |
4445 | { | |
4446 | COND_COM *l, *r; | |
4447 | ||
4448 | l = cond_term (); | |
4449 | if (cond_token == AND_AND) | |
4450 | { | |
4451 | r = cond_and (); | |
4452 | l = make_cond_node (COND_AND, (WORD_DESC *)NULL, l, r); | |
4453 | } | |
4454 | return l; | |
4455 | } | |
4456 | ||
4457 | static int | |
4458 | cond_skip_newlines () | |
4459 | { | |
4460 | while ((cond_token = read_token (READ)) == '\n') | |
4461 | { | |
4462 | if (SHOULD_PROMPT ()) | |
4463 | prompt_again (); | |
4464 | } | |
4465 | return (cond_token); | |
4466 | } | |
4467 | ||
4468 | #define COND_RETURN_ERROR() \ | |
4469 | do { cond_token = COND_ERROR; return ((COND_COM *)NULL); } while (0) | |
4470 | ||
4471 | static COND_COM * | |
4472 | cond_term () | |
4473 | { | |
4474 | WORD_DESC *op; | |
4475 | COND_COM *term, *tleft, *tright; | |
4476 | int tok, lineno; | |
4477 | char *etext; | |
4478 | ||
4479 | /* Read a token. It can be a left paren, a `!', a unary operator, or a | |
4480 | word that should be the first argument of a binary operator. Start by | |
4481 | skipping newlines, since this is a compound command. */ | |
4482 | tok = cond_skip_newlines (); | |
4483 | lineno = line_number; | |
4484 | if (tok == COND_END) | |
4485 | { | |
4486 | COND_RETURN_ERROR (); | |
4487 | } | |
4488 | else if (tok == '(') | |
4489 | { | |
4490 | term = cond_expr (); | |
4491 | if (cond_token != ')') | |
4492 | { | |
4493 | if (term) | |
4494 | dispose_cond_node (term); /* ( */ | |
4495 | if (etext = error_token_from_token (cond_token)) | |
4496 | { | |
4497 | parser_error (lineno, _("unexpected token `%s', expected `)'"), etext); | |
4498 | free (etext); | |
4499 | } | |
4500 | else | |
4501 | parser_error (lineno, _("expected `)'")); | |
4502 | COND_RETURN_ERROR (); | |
4503 | } | |
4504 | term = make_cond_node (COND_EXPR, (WORD_DESC *)NULL, term, (COND_COM *)NULL); | |
4505 | (void)cond_skip_newlines (); | |
4506 | } | |
4507 | else if (tok == BANG || (tok == WORD && (yylval.word->word[0] == '!' && yylval.word->word[1] == '\0'))) | |
4508 | { | |
4509 | if (tok == WORD) | |
4510 | dispose_word (yylval.word); /* not needed */ | |
4511 | term = cond_term (); | |
4512 | if (term) | |
4513 | term->flags |= CMD_INVERT_RETURN; | |
4514 | } | |
4515 | else if (tok == WORD && yylval.word->word[0] == '-' && yylval.word->word[2] == 0 && test_unop (yylval.word->word)) | |
4516 | { | |
4517 | op = yylval.word; | |
4518 | tok = read_token (READ); | |
4519 | if (tok == WORD) | |
4520 | { | |
4521 | tleft = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL); | |
4522 | term = make_cond_node (COND_UNARY, op, tleft, (COND_COM *)NULL); | |
4523 | } | |
4524 | else | |
4525 | { | |
4526 | dispose_word (op); | |
4527 | if (etext = error_token_from_token (tok)) | |
4528 | { | |
4529 | parser_error (line_number, _("unexpected argument `%s' to conditional unary operator"), etext); | |
4530 | free (etext); | |
4531 | } | |
4532 | else | |
4533 | parser_error (line_number, _("unexpected argument to conditional unary operator")); | |
4534 | COND_RETURN_ERROR (); | |
4535 | } | |
4536 | ||
4537 | (void)cond_skip_newlines (); | |
4538 | } | |
4539 | else if (tok == WORD) /* left argument to binary operator */ | |
4540 | { | |
4541 | /* lhs */ | |
4542 | tleft = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL); | |
4543 | ||
4544 | /* binop */ | |
4545 | tok = read_token (READ); | |
4546 | if (tok == WORD && test_binop (yylval.word->word)) | |
4547 | { | |
4548 | op = yylval.word; | |
4549 | if (op->word[0] == '=' && (op->word[1] == '\0' || (op->word[1] == '=' && op->word[2] == '\0'))) | |
4550 | parser_state |= PST_EXTPAT; | |
4551 | else if (op->word[0] == '!' && op->word[1] == '=' && op->word[2] == '\0') | |
4552 | parser_state |= PST_EXTPAT; | |
4553 | } | |
4554 | #if defined (COND_REGEXP) | |
4555 | else if (tok == WORD && STREQ (yylval.word->word, "=~")) | |
4556 | { | |
4557 | op = yylval.word; | |
4558 | parser_state |= PST_REGEXP; | |
4559 | } | |
4560 | #endif | |
4561 | else if (tok == '<' || tok == '>') | |
4562 | op = make_word_from_token (tok); /* ( */ | |
4563 | /* There should be a check before blindly accepting the `)' that we have | |
4564 | seen the opening `('. */ | |
4565 | else if (tok == COND_END || tok == AND_AND || tok == OR_OR || tok == ')') | |
4566 | { | |
4567 | /* Special case. [[ x ]] is equivalent to [[ -n x ]], just like | |
4568 | the test command. Similarly for [[ x && expr ]] or | |
4569 | [[ x || expr ]] or [[ (x) ]]. */ | |
4570 | op = make_word ("-n"); | |
4571 | term = make_cond_node (COND_UNARY, op, tleft, (COND_COM *)NULL); | |
4572 | cond_token = tok; | |
4573 | return (term); | |
4574 | } | |
4575 | else | |
4576 | { | |
4577 | if (etext = error_token_from_token (tok)) | |
4578 | { | |
4579 | parser_error (line_number, _("unexpected token `%s', conditional binary operator expected"), etext); | |
4580 | free (etext); | |
4581 | } | |
4582 | else | |
4583 | parser_error (line_number, _("conditional binary operator expected")); | |
4584 | dispose_cond_node (tleft); | |
4585 | COND_RETURN_ERROR (); | |
4586 | } | |
4587 | ||
4588 | /* rhs */ | |
4589 | if (parser_state & PST_EXTPAT) | |
4590 | extended_glob = 1; | |
4591 | tok = read_token (READ); | |
4592 | if (parser_state & PST_EXTPAT) | |
4593 | extended_glob = global_extglob; | |
4594 | parser_state &= ~(PST_REGEXP|PST_EXTPAT); | |
4595 | ||
4596 | if (tok == WORD) | |
4597 | { | |
4598 | tright = make_cond_node (COND_TERM, yylval.word, (COND_COM *)NULL, (COND_COM *)NULL); | |
4599 | term = make_cond_node (COND_BINARY, op, tleft, tright); | |
4600 | } | |
4601 | else | |
4602 | { | |
4603 | if (etext = error_token_from_token (tok)) | |
4604 | { | |
4605 | parser_error (line_number, _("unexpected argument `%s' to conditional binary operator"), etext); | |
4606 | free (etext); | |
4607 | } | |
4608 | else | |
4609 | parser_error (line_number, _("unexpected argument to conditional binary operator")); | |
4610 | dispose_cond_node (tleft); | |
4611 | dispose_word (op); | |
4612 | COND_RETURN_ERROR (); | |
4613 | } | |
4614 | ||
4615 | (void)cond_skip_newlines (); | |
4616 | } | |
4617 | else | |
4618 | { | |
4619 | if (tok < 256) | |
4620 | parser_error (line_number, _("unexpected token `%c' in conditional command"), tok); | |
4621 | else if (etext = error_token_from_token (tok)) | |
4622 | { | |
4623 | parser_error (line_number, _("unexpected token `%s' in conditional command"), etext); | |
4624 | free (etext); | |
4625 | } | |
4626 | else | |
4627 | parser_error (line_number, _("unexpected token %d in conditional command"), tok); | |
4628 | COND_RETURN_ERROR (); | |
4629 | } | |
4630 | return (term); | |
4631 | } | |
4632 | ||
4633 | /* This is kind of bogus -- we slip a mini recursive-descent parser in | |
4634 | here to handle the conditional statement syntax. */ | |
4635 | static COMMAND * | |
4636 | parse_cond_command () | |
4637 | { | |
4638 | COND_COM *cexp; | |
4639 | ||
4640 | global_extglob = extended_glob; | |
4641 | cexp = cond_expr (); | |
4642 | return (make_cond_command (cexp)); | |
4643 | } | |
4644 | #endif | |
4645 | ||
4646 | #if defined (ARRAY_VARS) | |
4647 | /* When this is called, it's guaranteed that we don't care about anything | |
4648 | in t beyond i. We do save and restore the chars, though. */ | |
4649 | static int | |
4650 | token_is_assignment (t, i) | |
4651 | char *t; | |
4652 | int i; | |
4653 | { | |
4654 | unsigned char c, c1; | |
4655 | int r; | |
4656 | ||
4657 | c = t[i]; c1 = t[i+1]; | |
4658 | t[i] = '='; t[i+1] = '\0'; | |
4659 | r = assignment (t, (parser_state & PST_COMPASSIGN) != 0); | |
4660 | t[i] = c; t[i+1] = c1; | |
4661 | return r; | |
4662 | } | |
4663 | ||
4664 | /* XXX - possible changes here for `+=' */ | |
4665 | static int | |
4666 | token_is_ident (t, i) | |
4667 | char *t; | |
4668 | int i; | |
4669 | { | |
4670 | unsigned char c; | |
4671 | int r; | |
4672 | ||
4673 | c = t[i]; | |
4674 | t[i] = '\0'; | |
4675 | r = legal_identifier (t); | |
4676 | t[i] = c; | |
4677 | return r; | |
4678 | } | |
4679 | #endif | |
4680 | ||
4681 | static int | |
4682 | read_token_word (character) | |
4683 | int character; | |
4684 | { | |
4685 | /* The value for YYLVAL when a WORD is read. */ | |
4686 | WORD_DESC *the_word; | |
4687 | ||
4688 | /* Index into the token that we are building. */ | |
4689 | int token_index; | |
4690 | ||
4691 | /* ALL_DIGITS becomes zero when we see a non-digit. */ | |
4692 | int all_digit_token; | |
4693 | ||
4694 | /* DOLLAR_PRESENT becomes non-zero if we see a `$'. */ | |
4695 | int dollar_present; | |
4696 | ||
4697 | /* COMPOUND_ASSIGNMENT becomes non-zero if we are parsing a compound | |
4698 | assignment. */ | |
4699 | int compound_assignment; | |
4700 | ||
4701 | /* QUOTED becomes non-zero if we see one of ("), ('), (`), or (\). */ | |
4702 | int quoted; | |
4703 | ||
4704 | /* Non-zero means to ignore the value of the next character, and just | |
4705 | to add it no matter what. */ | |
4706 | int pass_next_character; | |
4707 | ||
4708 | /* The current delimiting character. */ | |
4709 | int cd; | |
4710 | int result, peek_char; | |
4711 | char *ttok, *ttrans; | |
4712 | int ttoklen, ttranslen; | |
4713 | intmax_t lvalue; | |
4714 | ||
4715 | if (token_buffer_size < TOKEN_DEFAULT_INITIAL_SIZE) | |
4716 | token = (char *)xrealloc (token, token_buffer_size = TOKEN_DEFAULT_INITIAL_SIZE); | |
4717 | ||
4718 | token_index = 0; | |
4719 | all_digit_token = DIGIT (character); | |
4720 | dollar_present = quoted = pass_next_character = compound_assignment = 0; | |
4721 | ||
4722 | for (;;) | |
4723 | { | |
4724 | if (character == EOF) | |
4725 | goto got_token; | |
4726 | ||
4727 | if (pass_next_character) | |
4728 | { | |
4729 | pass_next_character = 0; | |
4730 | goto got_escaped_character; | |
4731 | } | |
4732 | ||
4733 | cd = current_delimiter (dstack); | |
4734 | ||
4735 | /* Handle backslashes. Quote lots of things when not inside of | |
4736 | double-quotes, quote some things inside of double-quotes. */ | |
4737 | if MBTEST(character == '\\') | |
4738 | { | |
4739 | peek_char = shell_getc (0); | |
4740 | ||
4741 | /* Backslash-newline is ignored in all cases except | |
4742 | when quoted with single quotes. */ | |
4743 | if (peek_char == '\n') | |
4744 | { | |
4745 | character = '\n'; | |
4746 | goto next_character; | |
4747 | } | |
4748 | else | |
4749 | { | |
4750 | shell_ungetc (peek_char); | |
4751 | ||
4752 | /* If the next character is to be quoted, note it now. */ | |
4753 | if (cd == 0 || cd == '`' || | |
4754 | (cd == '"' && peek_char >= 0 && (sh_syntaxtab[peek_char] & CBSDQUOTE))) | |
4755 | pass_next_character++; | |
4756 | ||
4757 | quoted = 1; | |
4758 | goto got_character; | |
4759 | } | |
4760 | } | |
4761 | ||
4762 | /* Parse a matched pair of quote characters. */ | |
4763 | if MBTEST(shellquote (character)) | |
4764 | { | |
4765 | push_delimiter (dstack, character); | |
4766 | ttok = parse_matched_pair (character, character, character, &ttoklen, (character == '`') ? P_COMMAND : 0); | |
4767 | pop_delimiter (dstack); | |
4768 | if (ttok == &matched_pair_error) | |
4769 | return -1; /* Bail immediately. */ | |
4770 | RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2, | |
4771 | token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); | |
4772 | token[token_index++] = character; | |
4773 | strcpy (token + token_index, ttok); | |
4774 | token_index += ttoklen; | |
4775 | all_digit_token = 0; | |
4776 | quoted = 1; | |
4777 | dollar_present |= (character == '"' && strchr (ttok, '$') != 0); | |
4778 | FREE (ttok); | |
4779 | goto next_character; | |
4780 | } | |
4781 | ||
4782 | #ifdef COND_REGEXP | |
4783 | /* When parsing a regexp as a single word inside a conditional command, | |
4784 | we need to special-case characters special to both the shell and | |
4785 | regular expressions. Right now, that is only '(' and '|'. */ /*)*/ | |
4786 | if MBTEST((parser_state & PST_REGEXP) && (character == '(' || character == '|')) /*)*/ | |
4787 | { | |
4788 | if (character == '|') | |
4789 | goto got_character; | |
4790 | ||
4791 | push_delimiter (dstack, character); | |
4792 | ttok = parse_matched_pair (cd, '(', ')', &ttoklen, 0); | |
4793 | pop_delimiter (dstack); | |
4794 | if (ttok == &matched_pair_error) | |
4795 | return -1; /* Bail immediately. */ | |
4796 | RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2, | |
4797 | token_buffer_size, TOKEN_DEFAULT_GROW_SIZE); | |
4798 | token[token_index++] = character; | |
4799 | strcpy (token + token_index, ttok); | |
4800 | token_index += ttoklen; | |
4801 | FREE (ttok); | |
4802 | dollar_present = all_digit_token = 0; | |
4803 | goto next_character; | |
4804 | } | |
4805 | #endif /* COND_REGEXP */ | |
4806 | ||
4807 | #ifdef EXTENDED_GLOB | |
4808 | /* Parse a ksh-style extended pattern matching specification. */ | |
4809 | if MBTEST(extended_glob && PATTERN_CHAR (character)) | |
4810 | { | |
4811 | peek_char = shell_getc (1); | |
4812 | if MBTEST(peek_char == '(') /* ) */ | |
4813 | { | |
4814 | push_delimiter (dstack, peek_char); | |
4815 | ttok = parse_matched_pair (cd, '(', ')', &ttoklen, 0); | |
4816 | pop_delimiter (dstack); | |
4817 | if (ttok == &matched_pair_error) | |
4818 | return -1; /* Bail immediately. */ | |
4819 | RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 3, | |
4820 | token_buffer_size, | |
4821 | TOKEN_DEFAULT_GROW_SIZE); | |
4822 | token[token_index++] = character; | |
4823 | token[token_index++] = peek_char; | |
4824 | strcpy (token + token_index, ttok); | |
4825 | token_index += ttoklen; | |
4826 | FREE (ttok); | |
4827 | dollar_present = all_digit_token = 0; | |
4828 | goto next_character; | |
4829 | } | |
4830 | else | |
4831 | shell_ungetc (peek_char); | |
4832 | } | |
4833 | #endif /* EXTENDED_GLOB */ | |
4834 | ||
4835 | /* If the delimiter character is not single quote, parse some of | |
4836 | the shell expansions that must be read as a single word. */ | |
4837 | if (shellexp (character)) | |
4838 | { | |
4839 | peek_char = shell_getc (1); | |
4840 | /* $(...), <(...), >(...), $((...)), ${...}, and $[...] constructs */ | |
4841 | if MBTEST(peek_char == '(' || | |
4842 | ((peek_char == '{' || peek_char == '[') && character == '$')) /* ) ] } */ | |
4843 | { | |
4844 | if (peek_char == '{') /* } */ | |
4845 | ttok = parse_matched_pair (cd, '{', '}', &ttoklen, P_FIRSTCLOSE|P_DOLBRACE); | |
4846 | else if (peek_char == '(') /* ) */ | |
4847 | { | |
4848 | /* XXX - push and pop the `(' as a delimiter for use by | |
4849 | the command-oriented-history code. This way newlines | |
4850 | appearing in the $(...) string get added to the | |
4851 | history literally rather than causing a possibly- | |
4852 | incorrect `;' to be added. ) */ | |
4853 | push_delimiter (dstack, peek_char); | |
4854 | ttok = parse_comsub (cd, '(', ')', &ttoklen, P_COMMAND); | |
4855 | pop_delimiter (dstack); | |
4856 | } | |
4857 | else | |
4858 | ttok = parse_matched_pair (cd, '[', ']', &ttoklen, 0); | |
4859 | if (ttok == &matched_pair_error) | |
4860 | return -1; /* Bail immediately. */ | |
4861 | RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 3, | |
4862 | token_buffer_size, | |
4863 | TOKEN_DEFAULT_GROW_SIZE); | |
4864 | token[token_index++] = character; | |
4865 | token[token_index++] = peek_char; | |
4866 | strcpy (token + token_index, ttok); | |
4867 | token_index += ttoklen; | |
4868 | FREE (ttok); | |
4869 | dollar_present = 1; | |
4870 | all_digit_token = 0; | |
4871 | goto next_character; | |
4872 | } | |
4873 | /* This handles $'...' and $"..." new-style quoted strings. */ | |
4874 | else if MBTEST(character == '$' && (peek_char == '\'' || peek_char == '"')) | |
4875 | { | |
4876 | int first_line; | |
4877 | ||
4878 | first_line = line_number; | |
4879 | push_delimiter (dstack, peek_char); | |
4880 | ttok = parse_matched_pair (peek_char, peek_char, peek_char, | |
4881 | &ttoklen, | |
4882 | (peek_char == '\'') ? P_ALLOWESC : 0); | |
4883 | pop_delimiter (dstack); | |
4884 | if (ttok == &matched_pair_error) | |
4885 | return -1; | |
4886 | if (peek_char == '\'') | |
4887 | { | |
4888 | ttrans = ansiexpand (ttok, 0, ttoklen - 1, &ttranslen); | |
4889 | free (ttok); | |
4890 | ||
4891 | /* Insert the single quotes and correctly quote any | |
4892 | embedded single quotes (allowed because P_ALLOWESC was | |
4893 | passed to parse_matched_pair). */ | |
4894 | ttok = sh_single_quote (ttrans); | |
4895 | free (ttrans); | |
4896 | ttranslen = strlen (ttok); | |
4897 | ttrans = ttok; | |
4898 | } | |
4899 | else | |
4900 | { | |
4901 | /* Try to locale-expand the converted string. */ | |
4902 | ttrans = localeexpand (ttok, 0, ttoklen - 1, first_line, &ttranslen); | |
4903 | free (ttok); | |
4904 | ||
4905 | /* Add the double quotes back */ | |
4906 | ttok = sh_mkdoublequoted (ttrans, ttranslen, 0); | |
4907 | free (ttrans); | |
4908 | ttranslen += 2; | |
4909 | ttrans = ttok; | |
4910 | } | |
4911 | ||
4912 | RESIZE_MALLOCED_BUFFER (token, token_index, ttranslen + 1, | |
4913 | token_buffer_size, | |
4914 | TOKEN_DEFAULT_GROW_SIZE); | |
4915 | strcpy (token + token_index, ttrans); | |
4916 | token_index += ttranslen; | |
4917 | FREE (ttrans); | |
4918 | quoted = 1; | |
4919 | all_digit_token = 0; | |
4920 | goto next_character; | |
4921 | } | |
4922 | /* This could eventually be extended to recognize all of the | |
4923 | shell's single-character parameter expansions, and set flags.*/ | |
4924 | else if MBTEST(character == '$' && peek_char == '$') | |
4925 | { | |
4926 | RESIZE_MALLOCED_BUFFER (token, token_index, 3, | |
4927 | token_buffer_size, | |
4928 | TOKEN_DEFAULT_GROW_SIZE); | |
4929 | token[token_index++] = '$'; | |
4930 | token[token_index++] = peek_char; | |
4931 | dollar_present = 1; | |
4932 | all_digit_token = 0; | |
4933 | goto next_character; | |
4934 | } | |
4935 | else | |
4936 | shell_ungetc (peek_char); | |
4937 | } | |
4938 | ||
4939 | #if defined (ARRAY_VARS) | |
4940 | /* Identify possible array subscript assignment; match [...]. If | |
4941 | parser_state&PST_COMPASSIGN, we need to parse [sub]=words treating | |
4942 | `sub' as if it were enclosed in double quotes. */ | |
4943 | else if MBTEST(character == '[' && /* ] */ | |
4944 | ((token_index > 0 && assignment_acceptable (last_read_token) && token_is_ident (token, token_index)) || | |
4945 | (token_index == 0 && (parser_state&PST_COMPASSIGN)))) | |
4946 | { | |
4947 | ttok = parse_matched_pair (cd, '[', ']', &ttoklen, P_ARRAYSUB); | |
4948 | if (ttok == &matched_pair_error) | |
4949 | return -1; /* Bail immediately. */ | |
4950 | RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 2, | |
4951 | token_buffer_size, | |
4952 | TOKEN_DEFAULT_GROW_SIZE); | |
4953 | token[token_index++] = character; | |
4954 | strcpy (token + token_index, ttok); | |
4955 | token_index += ttoklen; | |
4956 | FREE (ttok); | |
4957 | all_digit_token = 0; | |
4958 | goto next_character; | |
4959 | } | |
4960 | /* Identify possible compound array variable assignment. */ | |
4961 | else if MBTEST(character == '=' && token_index > 0 && (assignment_acceptable (last_read_token) || (parser_state & PST_ASSIGNOK)) && token_is_assignment (token, token_index)) | |
4962 | { | |
4963 | peek_char = shell_getc (1); | |
4964 | if MBTEST(peek_char == '(') /* ) */ | |
4965 | { | |
4966 | ttok = parse_compound_assignment (&ttoklen); | |
4967 | ||
4968 | RESIZE_MALLOCED_BUFFER (token, token_index, ttoklen + 4, | |
4969 | token_buffer_size, | |
4970 | TOKEN_DEFAULT_GROW_SIZE); | |
4971 | ||
4972 | token[token_index++] = '='; | |
4973 | token[token_index++] = '('; | |
4974 | if (ttok) | |
4975 | { | |
4976 | strcpy (token + token_index, ttok); | |
4977 | token_index += ttoklen; | |
4978 | } | |
4979 | token[token_index++] = ')'; | |
4980 | FREE (ttok); | |
4981 | all_digit_token = 0; | |
4982 | compound_assignment = 1; | |
4983 | #if 1 | |
4984 | goto next_character; | |
4985 | #else | |
4986 | goto got_token; /* ksh93 seems to do this */ | |
4987 | #endif | |
4988 | } | |
4989 | else | |
4990 | shell_ungetc (peek_char); | |
4991 | } | |
4992 | #endif | |
4993 | ||
4994 | /* When not parsing a multi-character word construct, shell meta- | |
4995 | characters break words. */ | |
4996 | if MBTEST(shellbreak (character)) | |
4997 | { | |
4998 | shell_ungetc (character); | |
4999 | goto got_token; | |
5000 | } | |
5001 | ||
5002 | got_character: | |
5003 | if (character == CTLESC || character == CTLNUL) | |
5004 | { | |
5005 | RESIZE_MALLOCED_BUFFER (token, token_index, 2, token_buffer_size, | |
5006 | TOKEN_DEFAULT_GROW_SIZE); | |
5007 | token[token_index++] = CTLESC; | |
5008 | } | |
5009 | else | |
5010 | got_escaped_character: | |
5011 | RESIZE_MALLOCED_BUFFER (token, token_index, 1, token_buffer_size, | |
5012 | TOKEN_DEFAULT_GROW_SIZE); | |
5013 | ||
5014 | token[token_index++] = character; | |
5015 | ||
5016 | all_digit_token &= DIGIT (character); | |
5017 | dollar_present |= character == '$'; | |
5018 | ||
5019 | next_character: | |
5020 | if (character == '\n' && SHOULD_PROMPT ()) | |
5021 | prompt_again (); | |
5022 | ||
5023 | /* We want to remove quoted newlines (that is, a \<newline> pair) | |
5024 | unless we are within single quotes or pass_next_character is | |
5025 | set (the shell equivalent of literal-next). */ | |
5026 | cd = current_delimiter (dstack); | |
5027 | character = shell_getc (cd != '\'' && pass_next_character == 0); | |
5028 | } /* end for (;;) */ | |
5029 | ||
5030 | got_token: | |
5031 | ||
5032 | /* Calls to RESIZE_MALLOCED_BUFFER ensure there is sufficient room. */ | |
5033 | token[token_index] = '\0'; | |
5034 | ||
5035 | /* Check to see what thing we should return. If the last_read_token | |
5036 | is a `<', or a `&', or the character which ended this token is | |
5037 | a '>' or '<', then, and ONLY then, is this input token a NUMBER. | |
5038 | Otherwise, it is just a word, and should be returned as such. */ | |
5039 | if MBTEST(all_digit_token && (character == '<' || character == '>' || | |
5040 | last_read_token == LESS_AND || | |
5041 | last_read_token == GREATER_AND)) | |
5042 | { | |
5043 | if (legal_number (token, &lvalue) && (int)lvalue == lvalue) | |
5044 | { | |
5045 | yylval.number = lvalue; | |
5046 | return (NUMBER); | |
5047 | } | |
5048 | } | |
5049 | ||
5050 | /* Check for special case tokens. */ | |
5051 | result = (last_shell_getc_is_singlebyte) ? special_case_tokens (token) : -1; | |
5052 | if (result >= 0) | |
5053 | return result; | |
5054 | ||
5055 | #if defined (ALIAS) | |
5056 | /* Posix.2 does not allow reserved words to be aliased, so check for all | |
5057 | of them, including special cases, before expanding the current token | |
5058 | as an alias. */ | |
5059 | if MBTEST(posixly_correct) | |
5060 | CHECK_FOR_RESERVED_WORD (token); | |
5061 | ||
5062 | /* Aliases are expanded iff EXPAND_ALIASES is non-zero, and quoting | |
5063 | inhibits alias expansion. */ | |
5064 | if (expand_aliases && quoted == 0) | |
5065 | { | |
5066 | result = alias_expand_token (token); | |
5067 | if (result == RE_READ_TOKEN) | |
5068 | return (RE_READ_TOKEN); | |
5069 | else if (result == NO_EXPANSION) | |
5070 | parser_state &= ~PST_ALEXPNEXT; | |
5071 | } | |
5072 | ||
5073 | /* If not in Posix.2 mode, check for reserved words after alias | |
5074 | expansion. */ | |
5075 | if MBTEST(posixly_correct == 0) | |
5076 | #endif | |
5077 | CHECK_FOR_RESERVED_WORD (token); | |
5078 | ||
5079 | the_word = alloc_word_desc (); | |
5080 | the_word->word = (char *)xmalloc (1 + token_index); | |
5081 | the_word->flags = 0; | |
5082 | strcpy (the_word->word, token); | |
5083 | if (dollar_present) | |
5084 | the_word->flags |= W_HASDOLLAR; | |
5085 | if (quoted) | |
5086 | the_word->flags |= W_QUOTED; /*(*/ | |
5087 | if (compound_assignment && token[token_index-1] == ')') | |
5088 | the_word->flags |= W_COMPASSIGN; | |
5089 | /* A word is an assignment if it appears at the beginning of a | |
5090 | simple command, or after another assignment word. This is | |
5091 | context-dependent, so it cannot be handled in the grammar. */ | |
5092 | if (assignment (token, (parser_state & PST_COMPASSIGN) != 0)) | |
5093 | { | |
5094 | the_word->flags |= W_ASSIGNMENT; | |
5095 | /* Don't perform word splitting on assignment statements. */ | |
5096 | if (assignment_acceptable (last_read_token) || (parser_state & PST_COMPASSIGN) != 0) | |
5097 | { | |
5098 | the_word->flags |= W_NOSPLIT; | |
5099 | if (parser_state & PST_COMPASSIGN) | |
5100 | the_word->flags |= W_NOGLOB; /* XXX - W_NOBRACE? */ | |
5101 | } | |
5102 | } | |
5103 | ||
5104 | if (command_token_position (last_read_token)) | |
5105 | { | |
5106 | struct builtin *b; | |
5107 | b = builtin_address_internal (token, 0); | |
5108 | if (b && (b->flags & ASSIGNMENT_BUILTIN)) | |
5109 | parser_state |= PST_ASSIGNOK; | |
5110 | else if (STREQ (token, "eval") || STREQ (token, "let")) | |
5111 | parser_state |= PST_ASSIGNOK; | |
5112 | } | |
5113 | ||
5114 | yylval.word = the_word; | |
5115 | ||
5116 | if (token[0] == '{' && token[token_index-1] == '}' && | |
5117 | (character == '<' || character == '>')) | |
5118 | { | |
5119 | /* can use token; already copied to the_word */ | |
5120 | token[token_index-1] = '\0'; | |
5121 | #if defined (ARRAY_VARS) | |
5122 | if (legal_identifier (token+1) || valid_array_reference (token+1, 0)) | |
5123 | #else | |
5124 | if (legal_identifier (token+1)) | |
5125 | #endif | |
5126 | { | |
5127 | strcpy (the_word->word, token+1); | |
5128 | /*itrace("read_token_word: returning REDIR_WORD for %s", the_word->word);*/ | |
5129 | return (REDIR_WORD); | |
5130 | } | |
5131 | } | |
5132 | ||
5133 | result = ((the_word->flags & (W_ASSIGNMENT|W_NOSPLIT)) == (W_ASSIGNMENT|W_NOSPLIT)) | |
5134 | ? ASSIGNMENT_WORD : WORD; | |
5135 | ||
5136 | switch (last_read_token) | |
5137 | { | |
5138 | case FUNCTION: | |
5139 | parser_state |= PST_ALLOWOPNBRC; | |
5140 | function_dstart = line_number; | |
5141 | break; | |
5142 | case CASE: | |
5143 | case SELECT: | |
5144 | case FOR: | |
5145 | if (word_top < MAX_CASE_NEST) | |
5146 | word_top++; | |
5147 | word_lineno[word_top] = line_number; | |
5148 | break; | |
5149 | } | |
5150 | ||
5151 | return (result); | |
5152 | } | |
5153 | ||
5154 | /* Return 1 if TOKSYM is a token that after being read would allow | |
5155 | a reserved word to be seen, else 0. */ | |
5156 | static int | |
5157 | reserved_word_acceptable (toksym) | |
5158 | int toksym; | |
5159 | { | |
5160 | switch (toksym) | |
5161 | { | |
5162 | case '\n': | |
5163 | case ';': | |
5164 | case '(': | |
5165 | case ')': | |
5166 | case '|': | |
5167 | case '&': | |
5168 | case '{': | |
5169 | case '}': /* XXX */ | |
5170 | case AND_AND: | |
5171 | case BANG: | |
5172 | case BAR_AND: | |
5173 | case DO: | |
5174 | case DONE: | |
5175 | case ELIF: | |
5176 | case ELSE: | |
5177 | case ESAC: | |
5178 | case FI: | |
5179 | case IF: | |
5180 | case OR_OR: | |
5181 | case SEMI_SEMI: | |
5182 | case SEMI_AND: | |
5183 | case SEMI_SEMI_AND: | |
5184 | case THEN: | |
5185 | case TIME: | |
5186 | case TIMEOPT: | |
5187 | case TIMEIGN: | |
5188 | case COPROC: | |
5189 | case UNTIL: | |
5190 | case WHILE: | |
5191 | case 0: | |
5192 | return 1; | |
5193 | default: | |
5194 | #if defined (COPROCESS_SUPPORT) | |
5195 | if (last_read_token == WORD && token_before_that == COPROC) | |
5196 | return 1; | |
5197 | #endif | |
5198 | if (last_read_token == WORD && token_before_that == FUNCTION) | |
5199 | return 1; | |
5200 | return 0; | |
5201 | } | |
5202 | } | |
5203 | ||
5204 | /* Return the index of TOKEN in the alist of reserved words, or -1 if | |
5205 | TOKEN is not a shell reserved word. */ | |
5206 | int | |
5207 | find_reserved_word (tokstr) | |
5208 | char *tokstr; | |
5209 | { | |
5210 | int i; | |
5211 | for (i = 0; word_token_alist[i].word; i++) | |
5212 | if (STREQ (tokstr, word_token_alist[i].word)) | |
5213 | return i; | |
5214 | return -1; | |
5215 | } | |
5216 | ||
5217 | /* An interface to let the rest of the shell (primarily the completion | |
5218 | system) know what the parser is expecting. */ | |
5219 | int | |
5220 | parser_in_command_position () | |
5221 | { | |
5222 | return (command_token_position (last_read_token)); | |
5223 | } | |
5224 | ||
5225 | #if 0 | |
5226 | #if defined (READLINE) | |
5227 | /* Called after each time readline is called. This insures that whatever | |
5228 | the new prompt string is gets propagated to readline's local prompt | |
5229 | variable. */ | |
5230 | static void | |
5231 | reset_readline_prompt () | |
5232 | { | |
5233 | char *temp_prompt; | |
5234 | ||
5235 | if (prompt_string_pointer) | |
5236 | { | |
5237 | temp_prompt = (*prompt_string_pointer) | |
5238 | ? decode_prompt_string (*prompt_string_pointer) | |
5239 | : (char *)NULL; | |
5240 | ||
5241 | if (temp_prompt == 0) | |
5242 | { | |
5243 | temp_prompt = (char *)xmalloc (1); | |
5244 | temp_prompt[0] = '\0'; | |
5245 | } | |
5246 | ||
5247 | FREE (current_readline_prompt); | |
5248 | current_readline_prompt = temp_prompt; | |
5249 | } | |
5250 | } | |
5251 | #endif /* READLINE */ | |
5252 | #endif /* 0 */ | |
5253 | ||
5254 | #if defined (HISTORY) | |
5255 | /* A list of tokens which can be followed by newlines, but not by | |
5256 | semi-colons. When concatenating multiple lines of history, the | |
5257 | newline separator for such tokens is replaced with a space. */ | |
5258 | static const int no_semi_successors[] = { | |
5259 | '\n', '{', '(', ')', ';', '&', '|', | |
5260 | CASE, DO, ELSE, IF, SEMI_SEMI, SEMI_AND, SEMI_SEMI_AND, THEN, UNTIL, | |
5261 | WHILE, AND_AND, OR_OR, IN, | |
5262 | 0 | |
5263 | }; | |
5264 | ||
5265 | /* If we are not within a delimited expression, try to be smart | |
5266 | about which separators can be semi-colons and which must be | |
5267 | newlines. Returns the string that should be added into the | |
5268 | history entry. LINE is the line we're about to add; it helps | |
5269 | make some more intelligent decisions in certain cases. */ | |
5270 | char * | |
5271 | history_delimiting_chars (line) | |
5272 | const char *line; | |
5273 | { | |
5274 | static int last_was_heredoc = 0; /* was the last entry the start of a here document? */ | |
5275 | register int i; | |
5276 | ||
5277 | if ((parser_state & PST_HEREDOC) == 0) | |
5278 | last_was_heredoc = 0; | |
5279 | ||
5280 | if (dstack.delimiter_depth != 0) | |
5281 | return ("\n"); | |
5282 | ||
5283 | /* We look for current_command_line_count == 2 because we are looking to | |
5284 | add the first line of the body of the here document (the second line | |
5285 | of the command). We also keep LAST_WAS_HEREDOC as a private sentinel | |
5286 | variable to note when we think we added the first line of a here doc | |
5287 | (the one with a "<<" somewhere in it) */ | |
5288 | if (parser_state & PST_HEREDOC) | |
5289 | { | |
5290 | if (last_was_heredoc) | |
5291 | { | |
5292 | last_was_heredoc = 0; | |
5293 | return "\n"; | |
5294 | } | |
5295 | return (here_doc_first_line ? "\n" : ""); | |
5296 | } | |
5297 | ||
5298 | if (parser_state & PST_COMPASSIGN) | |
5299 | return (" "); | |
5300 | ||
5301 | /* First, handle some special cases. */ | |
5302 | /*(*/ | |
5303 | /* If we just read `()', assume it's a function definition, and don't | |
5304 | add a semicolon. If the token before the `)' was not `(', and we're | |
5305 | not in the midst of parsing a case statement, assume it's a | |
5306 | parenthesized command and add the semicolon. */ | |
5307 | /*)(*/ | |
5308 | if (token_before_that == ')') | |
5309 | { | |
5310 | if (two_tokens_ago == '(') /*)*/ /* function def */ | |
5311 | return " "; | |
5312 | /* This does not work for subshells inside case statement | |
5313 | command lists. It's a suboptimal solution. */ | |
5314 | else if (parser_state & PST_CASESTMT) /* case statement pattern */ | |
5315 | return " "; | |
5316 | else | |
5317 | return "; "; /* (...) subshell */ | |
5318 | } | |
5319 | else if (token_before_that == WORD && two_tokens_ago == FUNCTION) | |
5320 | return " "; /* function def using `function name' without `()' */ | |
5321 | ||
5322 | /* If we're not in a here document, but we think we're about to parse one, | |
5323 | and we would otherwise return a `;', return a newline to delimit the | |
5324 | line with the here-doc delimiter */ | |
5325 | else if ((parser_state & PST_HEREDOC) == 0 && current_command_line_count > 1 && last_read_token == '\n' && strstr (line, "<<")) | |
5326 | { | |
5327 | last_was_heredoc = 1; | |
5328 | return "\n"; | |
5329 | } | |
5330 | else if ((parser_state & PST_HEREDOC) == 0 && current_command_line_count > 1 && need_here_doc > 0) | |
5331 | return "\n"; | |
5332 | else if (token_before_that == WORD && two_tokens_ago == FOR) | |
5333 | { | |
5334 | /* Tricky. `for i\nin ...' should not have a semicolon, but | |
5335 | `for i\ndo ...' should. We do what we can. */ | |
5336 | for (i = shell_input_line_index; whitespace (shell_input_line[i]); i++) | |
5337 | ; | |
5338 | if (shell_input_line[i] && shell_input_line[i] == 'i' && shell_input_line[i+1] == 'n') | |
5339 | return " "; | |
5340 | return ";"; | |
5341 | } | |
5342 | else if (two_tokens_ago == CASE && token_before_that == WORD && (parser_state & PST_CASESTMT)) | |
5343 | return " "; | |
5344 | ||
5345 | for (i = 0; no_semi_successors[i]; i++) | |
5346 | { | |
5347 | if (token_before_that == no_semi_successors[i]) | |
5348 | return (" "); | |
5349 | } | |
5350 | ||
5351 | return ("; "); | |
5352 | } | |
5353 | #endif /* HISTORY */ | |
5354 | ||
5355 | /* Issue a prompt, or prepare to issue a prompt when the next character | |
5356 | is read. */ | |
5357 | static void | |
5358 | prompt_again () | |
5359 | { | |
5360 | char *temp_prompt; | |
5361 | ||
5362 | if (interactive == 0 || expanding_alias ()) /* XXX */ | |
5363 | return; | |
5364 | ||
5365 | ps1_prompt = get_string_value ("PS1"); | |
5366 | ps2_prompt = get_string_value ("PS2"); | |
5367 | ||
5368 | ps0_prompt = get_string_value ("PS0"); | |
5369 | ||
5370 | if (!prompt_string_pointer) | |
5371 | prompt_string_pointer = &ps1_prompt; | |
5372 | ||
5373 | temp_prompt = *prompt_string_pointer | |
5374 | ? decode_prompt_string (*prompt_string_pointer) | |
5375 | : (char *)NULL; | |
5376 | ||
5377 | if (temp_prompt == 0) | |
5378 | { | |
5379 | temp_prompt = (char *)xmalloc (1); | |
5380 | temp_prompt[0] = '\0'; | |
5381 | } | |
5382 | ||
5383 | current_prompt_string = *prompt_string_pointer; | |
5384 | prompt_string_pointer = &ps2_prompt; | |
5385 | ||
5386 | #if defined (READLINE) | |
5387 | if (!no_line_editing) | |
5388 | { | |
5389 | FREE (current_readline_prompt); | |
5390 | current_readline_prompt = temp_prompt; | |
5391 | } | |
5392 | else | |
5393 | #endif /* READLINE */ | |
5394 | { | |
5395 | FREE (current_decoded_prompt); | |
5396 | current_decoded_prompt = temp_prompt; | |
5397 | } | |
5398 | } | |
5399 | ||
5400 | int | |
5401 | get_current_prompt_level () | |
5402 | { | |
5403 | return ((current_prompt_string && current_prompt_string == ps2_prompt) ? 2 : 1); | |
5404 | } | |
5405 | ||
5406 | void | |
5407 | set_current_prompt_level (x) | |
5408 | int x; | |
5409 | { | |
5410 | prompt_string_pointer = (x == 2) ? &ps2_prompt : &ps1_prompt; | |
5411 | current_prompt_string = *prompt_string_pointer; | |
5412 | } | |
5413 | ||
5414 | static void | |
5415 | print_prompt () | |
5416 | { | |
5417 | fprintf (stderr, "%s", current_decoded_prompt); | |
5418 | fflush (stderr); | |
5419 | } | |
5420 | ||
5421 | /* Return a string which will be printed as a prompt. The string | |
5422 | may contain special characters which are decoded as follows: | |
5423 | ||
5424 | \a bell (ascii 07) | |
5425 | \d the date in Day Mon Date format | |
5426 | \e escape (ascii 033) | |
5427 | \h the hostname up to the first `.' | |
5428 | \H the hostname | |
5429 | \j the number of active jobs | |
5430 | \l the basename of the shell's tty device name | |
5431 | \n CRLF | |
5432 | \r CR | |
5433 | \s the name of the shell | |
5434 | \t the time in 24-hour hh:mm:ss format | |
5435 | \T the time in 12-hour hh:mm:ss format | |
5436 | \@ the time in 12-hour hh:mm am/pm format | |
5437 | \A the time in 24-hour hh:mm format | |
5438 | \D{fmt} the result of passing FMT to strftime(3) | |
5439 | \u your username | |
5440 | \v the version of bash (e.g., 2.00) | |
5441 | \V the release of bash, version + patchlevel (e.g., 2.00.0) | |
5442 | \w the current working directory | |
5443 | \W the last element of $PWD | |
5444 | \! the history number of this command | |
5445 | \# the command number of this command | |
5446 | \$ a $ or a # if you are root | |
5447 | \nnn character code nnn in octal | |
5448 | \\ a backslash | |
5449 | \[ begin a sequence of non-printing chars | |
5450 | \] end a sequence of non-printing chars | |
5451 | */ | |
5452 | #define PROMPT_GROWTH 48 | |
5453 | char * | |
5454 | decode_prompt_string (string) | |
5455 | char *string; | |
5456 | { | |
5457 | WORD_LIST *list; | |
5458 | char *result, *t; | |
5459 | struct dstack save_dstack; | |
5460 | int last_exit_value, last_comsub_pid; | |
5461 | #if defined (PROMPT_STRING_DECODE) | |
5462 | size_t result_size; | |
5463 | int result_index; | |
5464 | int c, n, i; | |
5465 | char *temp, *t_host, octal_string[4]; | |
5466 | struct tm *tm; | |
5467 | time_t the_time; | |
5468 | char timebuf[128]; | |
5469 | char *timefmt; | |
5470 | ||
5471 | result = (char *)xmalloc (result_size = PROMPT_GROWTH); | |
5472 | result[result_index = 0] = 0; | |
5473 | temp = (char *)NULL; | |
5474 | ||
5475 | while (c = *string++) | |
5476 | { | |
5477 | if (posixly_correct && c == '!') | |
5478 | { | |
5479 | if (*string == '!') | |
5480 | { | |
5481 | temp = savestring ("!"); | |
5482 | goto add_string; | |
5483 | } | |
5484 | else | |
5485 | { | |
5486 | #if !defined (HISTORY) | |
5487 | temp = savestring ("1"); | |
5488 | #else /* HISTORY */ | |
5489 | temp = itos (history_number ()); | |
5490 | #endif /* HISTORY */ | |
5491 | string--; /* add_string increments string again. */ | |
5492 | goto add_string; | |
5493 | } | |
5494 | } | |
5495 | if (c == '\\') | |
5496 | { | |
5497 | c = *string; | |
5498 | ||
5499 | switch (c) | |
5500 | { | |
5501 | case '0': | |
5502 | case '1': | |
5503 | case '2': | |
5504 | case '3': | |
5505 | case '4': | |
5506 | case '5': | |
5507 | case '6': | |
5508 | case '7': | |
5509 | strncpy (octal_string, string, 3); | |
5510 | octal_string[3] = '\0'; | |
5511 | ||
5512 | n = read_octal (octal_string); | |
5513 | temp = (char *)xmalloc (3); | |
5514 | ||
5515 | if (n == CTLESC || n == CTLNUL) | |
5516 | { | |
5517 | temp[0] = CTLESC; | |
5518 | temp[1] = n; | |
5519 | temp[2] = '\0'; | |
5520 | } | |
5521 | else if (n == -1) | |
5522 | { | |
5523 | temp[0] = '\\'; | |
5524 | temp[1] = '\0'; | |
5525 | } | |
5526 | else | |
5527 | { | |
5528 | temp[0] = n; | |
5529 | temp[1] = '\0'; | |
5530 | } | |
5531 | ||
5532 | for (c = 0; n != -1 && c < 3 && ISOCTAL (*string); c++) | |
5533 | string++; | |
5534 | ||
5535 | c = 0; /* tested at add_string: */ | |
5536 | goto add_string; | |
5537 | ||
5538 | case 'd': | |
5539 | case 't': | |
5540 | case 'T': | |
5541 | case '@': | |
5542 | case 'A': | |
5543 | /* Make the current time/date into a string. */ | |
5544 | (void) time (&the_time); | |
5545 | #if defined (HAVE_TZSET) | |
5546 | sv_tz ("TZ"); /* XXX -- just make sure */ | |
5547 | #endif | |
5548 | tm = localtime (&the_time); | |
5549 | ||
5550 | if (c == 'd') | |
5551 | n = strftime (timebuf, sizeof (timebuf), "%a %b %d", tm); | |
5552 | else if (c == 't') | |
5553 | n = strftime (timebuf, sizeof (timebuf), "%H:%M:%S", tm); | |
5554 | else if (c == 'T') | |
5555 | n = strftime (timebuf, sizeof (timebuf), "%I:%M:%S", tm); | |
5556 | else if (c == '@') | |
5557 | n = strftime (timebuf, sizeof (timebuf), "%I:%M %p", tm); | |
5558 | else if (c == 'A') | |
5559 | n = strftime (timebuf, sizeof (timebuf), "%H:%M", tm); | |
5560 | ||
5561 | if (n == 0) | |
5562 | timebuf[0] = '\0'; | |
5563 | else | |
5564 | timebuf[sizeof(timebuf) - 1] = '\0'; | |
5565 | ||
5566 | temp = savestring (timebuf); | |
5567 | goto add_string; | |
5568 | ||
5569 | case 'D': /* strftime format */ | |
5570 | if (string[1] != '{') /* } */ | |
5571 | goto not_escape; | |
5572 | ||
5573 | (void) time (&the_time); | |
5574 | tm = localtime (&the_time); | |
5575 | string += 2; /* skip { */ | |
5576 | timefmt = xmalloc (strlen (string) + 3); | |
5577 | for (t = timefmt; *string && *string != '}'; ) | |
5578 | *t++ = *string++; | |
5579 | *t = '\0'; | |
5580 | c = *string; /* tested at add_string */ | |
5581 | if (timefmt[0] == '\0') | |
5582 | { | |
5583 | timefmt[0] = '%'; | |
5584 | timefmt[1] = 'X'; /* locale-specific current time */ | |
5585 | timefmt[2] = '\0'; | |
5586 | } | |
5587 | n = strftime (timebuf, sizeof (timebuf), timefmt, tm); | |
5588 | free (timefmt); | |
5589 | ||
5590 | if (n == 0) | |
5591 | timebuf[0] = '\0'; | |
5592 | else | |
5593 | timebuf[sizeof(timebuf) - 1] = '\0'; | |
5594 | ||
5595 | if (promptvars || posixly_correct) | |
5596 | /* Make sure that expand_prompt_string is called with a | |
5597 | second argument of Q_DOUBLE_QUOTES if we use this | |
5598 | function here. */ | |
5599 | temp = sh_backslash_quote_for_double_quotes (timebuf); | |
5600 | else | |
5601 | temp = savestring (timebuf); | |
5602 | goto add_string; | |
5603 | ||
5604 | case 'n': | |
5605 | temp = (char *)xmalloc (3); | |
5606 | temp[0] = no_line_editing ? '\n' : '\r'; | |
5607 | temp[1] = no_line_editing ? '\0' : '\n'; | |
5608 | temp[2] = '\0'; | |
5609 | goto add_string; | |
5610 | ||
5611 | case 's': | |
5612 | temp = base_pathname (shell_name); | |
5613 | /* Try to quote anything the user can set in the file system */ | |
5614 | if (promptvars || posixly_correct) | |
5615 | temp = sh_backslash_quote_for_double_quotes (temp); | |
5616 | else | |
5617 | temp = savestring (temp); | |
5618 | goto add_string; | |
5619 | ||
5620 | case 'v': | |
5621 | case 'V': | |
5622 | temp = (char *)xmalloc (16); | |
5623 | if (c == 'v') | |
5624 | strcpy (temp, dist_version); | |
5625 | else | |
5626 | sprintf (temp, "%s.%d", dist_version, patch_level); | |
5627 | goto add_string; | |
5628 | ||
5629 | case 'w': | |
5630 | case 'W': | |
5631 | { | |
5632 | /* Use the value of PWD because it is much more efficient. */ | |
5633 | char t_string[PATH_MAX]; | |
5634 | int tlen; | |
5635 | ||
5636 | temp = get_string_value ("PWD"); | |
5637 | ||
5638 | if (temp == 0) | |
5639 | { | |
5640 | if (getcwd (t_string, sizeof(t_string)) == 0) | |
5641 | { | |
5642 | t_string[0] = '.'; | |
5643 | tlen = 1; | |
5644 | } | |
5645 | else | |
5646 | tlen = strlen (t_string); | |
5647 | } | |
5648 | else | |
5649 | { | |
5650 | tlen = sizeof (t_string) - 1; | |
5651 | strncpy (t_string, temp, tlen); | |
5652 | } | |
5653 | t_string[tlen] = '\0'; | |
5654 | ||
5655 | #if defined (MACOSX) | |
5656 | /* Convert from "fs" format to "input" format */ | |
5657 | temp = fnx_fromfs (t_string, strlen (t_string)); | |
5658 | if (temp != t_string) | |
5659 | strcpy (t_string, temp); | |
5660 | #endif | |
5661 | ||
5662 | #define ROOT_PATH(x) ((x)[0] == '/' && (x)[1] == 0) | |
5663 | #define DOUBLE_SLASH_ROOT(x) ((x)[0] == '/' && (x)[1] == '/' && (x)[2] == 0) | |
5664 | /* Abbreviate \W as ~ if $PWD == $HOME */ | |
5665 | if (c == 'W' && (((t = get_string_value ("HOME")) == 0) || STREQ (t, t_string) == 0)) | |
5666 | { | |
5667 | if (ROOT_PATH (t_string) == 0 && DOUBLE_SLASH_ROOT (t_string) == 0) | |
5668 | { | |
5669 | t = strrchr (t_string, '/'); | |
5670 | if (t) | |
5671 | memmove (t_string, t + 1, strlen (t)); /* strlen(t) to copy NULL */ | |
5672 | } | |
5673 | } | |
5674 | #undef ROOT_PATH | |
5675 | #undef DOUBLE_SLASH_ROOT | |
5676 | else | |
5677 | { | |
5678 | /* polite_directory_format is guaranteed to return a string | |
5679 | no longer than PATH_MAX - 1 characters. */ | |
5680 | temp = polite_directory_format (t_string); | |
5681 | if (temp != t_string) | |
5682 | strcpy (t_string, temp); | |
5683 | } | |
5684 | ||
5685 | temp = trim_pathname (t_string, PATH_MAX - 1); | |
5686 | /* If we're going to be expanding the prompt string later, | |
5687 | quote the directory name. */ | |
5688 | if (promptvars || posixly_correct) | |
5689 | /* Make sure that expand_prompt_string is called with a | |
5690 | second argument of Q_DOUBLE_QUOTES if we use this | |
5691 | function here. */ | |
5692 | temp = sh_backslash_quote_for_double_quotes (t_string); | |
5693 | else | |
5694 | temp = savestring (t_string); | |
5695 | ||
5696 | goto add_string; | |
5697 | } | |
5698 | ||
5699 | case 'u': | |
5700 | if (current_user.user_name == 0) | |
5701 | get_current_user_info (); | |
5702 | temp = savestring (current_user.user_name); | |
5703 | goto add_string; | |
5704 | ||
5705 | case 'h': | |
5706 | case 'H': | |
5707 | t_host = savestring (current_host_name); | |
5708 | if (c == 'h' && (t = (char *)strchr (t_host, '.'))) | |
5709 | *t = '\0'; | |
5710 | if (promptvars || posixly_correct) | |
5711 | /* Make sure that expand_prompt_string is called with a | |
5712 | second argument of Q_DOUBLE_QUOTES if we use this | |
5713 | function here. */ | |
5714 | temp = sh_backslash_quote_for_double_quotes (t_host); | |
5715 | else | |
5716 | temp = savestring (t_host); | |
5717 | free (t_host); | |
5718 | goto add_string; | |
5719 | ||
5720 | case '#': | |
5721 | temp = itos (current_command_number); | |
5722 | goto add_string; | |
5723 | ||
5724 | case '!': | |
5725 | #if !defined (HISTORY) | |
5726 | temp = savestring ("1"); | |
5727 | #else /* HISTORY */ | |
5728 | temp = itos (history_number ()); | |
5729 | #endif /* HISTORY */ | |
5730 | goto add_string; | |
5731 | ||
5732 | case '$': | |
5733 | t = temp = (char *)xmalloc (3); | |
5734 | if ((promptvars || posixly_correct) && (current_user.euid != 0)) | |
5735 | *t++ = '\\'; | |
5736 | *t++ = current_user.euid == 0 ? '#' : '$'; | |
5737 | *t = '\0'; | |
5738 | goto add_string; | |
5739 | ||
5740 | case 'j': | |
5741 | temp = itos (count_all_jobs ()); | |
5742 | goto add_string; | |
5743 | ||
5744 | case 'l': | |
5745 | #if defined (HAVE_TTYNAME) | |
5746 | temp = (char *)ttyname (fileno (stdin)); | |
5747 | t = temp ? base_pathname (temp) : "tty"; | |
5748 | temp = savestring (t); | |
5749 | #else | |
5750 | temp = savestring ("tty"); | |
5751 | #endif /* !HAVE_TTYNAME */ | |
5752 | goto add_string; | |
5753 | ||
5754 | #if defined (READLINE) | |
5755 | case '[': | |
5756 | case ']': | |
5757 | if (no_line_editing) | |
5758 | { | |
5759 | string++; | |
5760 | break; | |
5761 | } | |
5762 | temp = (char *)xmalloc (3); | |
5763 | n = (c == '[') ? RL_PROMPT_START_IGNORE : RL_PROMPT_END_IGNORE; | |
5764 | i = 0; | |
5765 | if (n == CTLESC || n == CTLNUL) | |
5766 | temp[i++] = CTLESC; | |
5767 | temp[i++] = n; | |
5768 | temp[i] = '\0'; | |
5769 | goto add_string; | |
5770 | #endif /* READLINE */ | |
5771 | ||
5772 | case '\\': | |
5773 | case 'a': | |
5774 | case 'e': | |
5775 | case 'r': | |
5776 | temp = (char *)xmalloc (2); | |
5777 | if (c == 'a') | |
5778 | temp[0] = '\07'; | |
5779 | else if (c == 'e') | |
5780 | temp[0] = '\033'; | |
5781 | else if (c == 'r') | |
5782 | temp[0] = '\r'; | |
5783 | else /* (c == '\\') */ | |
5784 | temp[0] = c; | |
5785 | temp[1] = '\0'; | |
5786 | goto add_string; | |
5787 | ||
5788 | default: | |
5789 | not_escape: | |
5790 | temp = (char *)xmalloc (3); | |
5791 | temp[0] = '\\'; | |
5792 | temp[1] = c; | |
5793 | temp[2] = '\0'; | |
5794 | ||
5795 | add_string: | |
5796 | if (c) | |
5797 | string++; | |
5798 | result = | |
5799 | sub_append_string (temp, result, &result_index, &result_size); | |
5800 | temp = (char *)NULL; /* Freed in sub_append_string (). */ | |
5801 | result[result_index] = '\0'; | |
5802 | break; | |
5803 | } | |
5804 | } | |
5805 | else | |
5806 | { | |
5807 | RESIZE_MALLOCED_BUFFER (result, result_index, 3, result_size, PROMPT_GROWTH); | |
5808 | /* dequote_string should take care of removing this if we are not | |
5809 | performing the rest of the word expansions. */ | |
5810 | if (c == CTLESC || c == CTLNUL) | |
5811 | result[result_index++] = CTLESC; | |
5812 | result[result_index++] = c; | |
5813 | result[result_index] = '\0'; | |
5814 | } | |
5815 | } | |
5816 | #else /* !PROMPT_STRING_DECODE */ | |
5817 | result = savestring (string); | |
5818 | #endif /* !PROMPT_STRING_DECODE */ | |
5819 | ||
5820 | /* Save the delimiter stack and point `dstack' to temp space so any | |
5821 | command substitutions in the prompt string won't result in screwing | |
5822 | up the parser's quoting state. */ | |
5823 | save_dstack = dstack; | |
5824 | dstack = temp_dstack; | |
5825 | dstack.delimiter_depth = 0; | |
5826 | ||
5827 | /* Perform variable and parameter expansion and command substitution on | |
5828 | the prompt string. */ | |
5829 | if (promptvars || posixly_correct) | |
5830 | { | |
5831 | last_exit_value = last_command_exit_value; | |
5832 | last_comsub_pid = last_command_subst_pid; | |
5833 | list = expand_prompt_string (result, Q_DOUBLE_QUOTES, 0); | |
5834 | free (result); | |
5835 | result = string_list (list); | |
5836 | dispose_words (list); | |
5837 | last_command_exit_value = last_exit_value; | |
5838 | last_command_subst_pid = last_comsub_pid; | |
5839 | } | |
5840 | else | |
5841 | { | |
5842 | t = dequote_string (result); | |
5843 | free (result); | |
5844 | result = t; | |
5845 | } | |
5846 | ||
5847 | dstack = save_dstack; | |
5848 | ||
5849 | return (result); | |
5850 | } | |
5851 | ||
5852 | /************************************************ | |
5853 | * * | |
5854 | * ERROR HANDLING * | |
5855 | * * | |
5856 | ************************************************/ | |
5857 | ||
5858 | /* Report a syntax error, and restart the parser. Call here for fatal | |
5859 | errors. */ | |
5860 | int | |
5861 | yyerror (msg) | |
5862 | const char *msg; | |
5863 | { | |
5864 | report_syntax_error ((char *)NULL); | |
5865 | reset_parser (); | |
5866 | return (0); | |
5867 | } | |
5868 | ||
5869 | static char * | |
5870 | error_token_from_token (tok) | |
5871 | int tok; | |
5872 | { | |
5873 | char *t; | |
5874 | ||
5875 | if (t = find_token_in_alist (tok, word_token_alist, 0)) | |
5876 | return t; | |
5877 | ||
5878 | if (t = find_token_in_alist (tok, other_token_alist, 0)) | |
5879 | return t; | |
5880 | ||
5881 | t = (char *)NULL; | |
5882 | /* This stuff is dicy and needs closer inspection */ | |
5883 | switch (current_token) | |
5884 | { | |
5885 | case WORD: | |
5886 | case ASSIGNMENT_WORD: | |
5887 | if (yylval.word) | |
5888 | t = savestring (yylval.word->word); | |
5889 | break; | |
5890 | case NUMBER: | |
5891 | t = itos (yylval.number); | |
5892 | break; | |
5893 | case ARITH_CMD: | |
5894 | if (yylval.word_list) | |
5895 | t = string_list (yylval.word_list); | |
5896 | break; | |
5897 | case ARITH_FOR_EXPRS: | |
5898 | if (yylval.word_list) | |
5899 | t = string_list_internal (yylval.word_list, " ; "); | |
5900 | break; | |
5901 | case COND_CMD: | |
5902 | t = (char *)NULL; /* punt */ | |
5903 | break; | |
5904 | } | |
5905 | ||
5906 | return t; | |
5907 | } | |
5908 | ||
5909 | static char * | |
5910 | error_token_from_text () | |
5911 | { | |
5912 | char *msg, *t; | |
5913 | int token_end, i; | |
5914 | ||
5915 | t = shell_input_line; | |
5916 | i = shell_input_line_index; | |
5917 | token_end = 0; | |
5918 | msg = (char *)NULL; | |
5919 | ||
5920 | if (i && t[i] == '\0') | |
5921 | i--; | |
5922 | ||
5923 | while (i && (whitespace (t[i]) || t[i] == '\n')) | |
5924 | i--; | |
5925 | ||
5926 | if (i) | |
5927 | token_end = i + 1; | |
5928 | ||
5929 | while (i && (member (t[i], " \n\t;|&") == 0)) | |
5930 | i--; | |
5931 | ||
5932 | while (i != token_end && (whitespace (t[i]) || t[i] == '\n')) | |
5933 | i++; | |
5934 | ||
5935 | /* Return our idea of the offending token. */ | |
5936 | if (token_end || (i == 0 && token_end == 0)) | |
5937 | { | |
5938 | if (token_end) | |
5939 | msg = substring (t, i, token_end); | |
5940 | else /* one-character token */ | |
5941 | { | |
5942 | msg = (char *)xmalloc (2); | |
5943 | msg[0] = t[i]; | |
5944 | msg[1] = '\0'; | |
5945 | } | |
5946 | } | |
5947 | ||
5948 | return (msg); | |
5949 | } | |
5950 | ||
5951 | static void | |
5952 | print_offending_line () | |
5953 | { | |
5954 | char *msg; | |
5955 | int token_end; | |
5956 | ||
5957 | msg = savestring (shell_input_line); | |
5958 | token_end = strlen (msg); | |
5959 | while (token_end && msg[token_end - 1] == '\n') | |
5960 | msg[--token_end] = '\0'; | |
5961 | ||
5962 | parser_error (line_number, "`%s'", msg); | |
5963 | free (msg); | |
5964 | } | |
5965 | ||
5966 | /* Report a syntax error with line numbers, etc. | |
5967 | Call here for recoverable errors. If you have a message to print, | |
5968 | then place it in MESSAGE, otherwise pass NULL and this will figure | |
5969 | out an appropriate message for you. */ | |
5970 | static void | |
5971 | report_syntax_error (message) | |
5972 | char *message; | |
5973 | { | |
5974 | char *msg, *p; | |
5975 | ||
5976 | if (message) | |
5977 | { | |
5978 | parser_error (line_number, "%s", message); | |
5979 | if (interactive && EOF_Reached) | |
5980 | EOF_Reached = 0; | |
5981 | last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE; | |
5982 | return; | |
5983 | } | |
5984 | ||
5985 | /* If the line of input we're reading is not null, try to find the | |
5986 | objectionable token. First, try to figure out what token the | |
5987 | parser's complaining about by looking at current_token. */ | |
5988 | if (current_token != 0 && EOF_Reached == 0 && (msg = error_token_from_token (current_token))) | |
5989 | { | |
5990 | if (ansic_shouldquote (msg)) | |
5991 | { | |
5992 | p = ansic_quote (msg, 0, NULL); | |
5993 | free (msg); | |
5994 | msg = p; | |
5995 | } | |
5996 | parser_error (line_number, _("syntax error near unexpected token `%s'"), msg); | |
5997 | free (msg); | |
5998 | ||
5999 | if (interactive == 0) | |
6000 | print_offending_line (); | |
6001 | ||
6002 | last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE; | |
6003 | return; | |
6004 | } | |
6005 | ||
6006 | /* If looking at the current token doesn't prove fruitful, try to find the | |
6007 | offending token by analyzing the text of the input line near the current | |
6008 | input line index and report what we find. */ | |
6009 | if (shell_input_line && *shell_input_line) | |
6010 | { | |
6011 | msg = error_token_from_text (); | |
6012 | if (msg) | |
6013 | { | |
6014 | parser_error (line_number, _("syntax error near `%s'"), msg); | |
6015 | free (msg); | |
6016 | } | |
6017 | ||
6018 | /* If not interactive, print the line containing the error. */ | |
6019 | if (interactive == 0) | |
6020 | print_offending_line (); | |
6021 | } | |
6022 | else | |
6023 | { | |
6024 | msg = EOF_Reached ? _("syntax error: unexpected end of file") : _("syntax error"); | |
6025 | parser_error (line_number, "%s", msg); | |
6026 | /* When the shell is interactive, this file uses EOF_Reached | |
6027 | only for error reporting. Other mechanisms are used to | |
6028 | decide whether or not to exit. */ | |
6029 | if (interactive && EOF_Reached) | |
6030 | EOF_Reached = 0; | |
6031 | } | |
6032 | ||
6033 | last_command_exit_value = parse_and_execute_level ? EX_BADSYNTAX : EX_BADUSAGE; | |
6034 | } | |
6035 | ||
6036 | /* ??? Needed function. ??? We have to be able to discard the constructs | |
6037 | created during parsing. In the case of error, we want to return | |
6038 | allocated objects to the memory pool. In the case of no error, we want | |
6039 | to throw away the information about where the allocated objects live. | |
6040 | (dispose_command () will actually free the command.) */ | |
6041 | static void | |
6042 | discard_parser_constructs (error_p) | |
6043 | int error_p; | |
6044 | { | |
6045 | } | |
6046 | ||
6047 | /************************************************ | |
6048 | * * | |
6049 | * EOF HANDLING * | |
6050 | * * | |
6051 | ************************************************/ | |
6052 | ||
6053 | /* Do that silly `type "bye" to exit' stuff. You know, "ignoreeof". */ | |
6054 | ||
6055 | /* A flag denoting whether or not ignoreeof is set. */ | |
6056 | int ignoreeof = 0; | |
6057 | ||
6058 | /* The number of times that we have encountered an EOF character without | |
6059 | another character intervening. When this gets above the limit, the | |
6060 | shell terminates. */ | |
6061 | int eof_encountered = 0; | |
6062 | ||
6063 | /* The limit for eof_encountered. */ | |
6064 | int eof_encountered_limit = 10; | |
6065 | ||
6066 | /* If we have EOF as the only input unit, this user wants to leave | |
6067 | the shell. If the shell is not interactive, then just leave. | |
6068 | Otherwise, if ignoreeof is set, and we haven't done this the | |
6069 | required number of times in a row, print a message. */ | |
6070 | static void | |
6071 | handle_eof_input_unit () | |
6072 | { | |
6073 | if (interactive) | |
6074 | { | |
6075 | /* shell.c may use this to decide whether or not to write out the | |
6076 | history, among other things. We use it only for error reporting | |
6077 | in this file. */ | |
6078 | if (EOF_Reached) | |
6079 | EOF_Reached = 0; | |
6080 | ||
6081 | /* If the user wants to "ignore" eof, then let her do so, kind of. */ | |
6082 | if (ignoreeof) | |
6083 | { | |
6084 | if (eof_encountered < eof_encountered_limit) | |
6085 | { | |
6086 | fprintf (stderr, _("Use \"%s\" to leave the shell.\n"), | |
6087 | login_shell ? "logout" : "exit"); | |
6088 | eof_encountered++; | |
6089 | /* Reset the parsing state. */ | |
6090 | last_read_token = current_token = '\n'; | |
6091 | /* Reset the prompt string to be $PS1. */ | |
6092 | prompt_string_pointer = (char **)NULL; | |
6093 | prompt_again (); | |
6094 | return; | |
6095 | } | |
6096 | } | |
6097 | ||
6098 | /* In this case EOF should exit the shell. Do it now. */ | |
6099 | reset_parser (); | |
6100 | exit_builtin ((WORD_LIST *)NULL); | |
6101 | } | |
6102 | else | |
6103 | { | |
6104 | /* We don't write history files, etc., for non-interactive shells. */ | |
6105 | EOF_Reached = 1; | |
6106 | } | |
6107 | } | |
6108 | ||
6109 | /************************************************ | |
6110 | * * | |
6111 | * STRING PARSING FUNCTIONS * | |
6112 | * * | |
6113 | ************************************************/ | |
6114 | ||
6115 | /* It's very important that these two functions treat the characters | |
6116 | between ( and ) identically. */ | |
6117 | ||
6118 | static WORD_LIST parse_string_error; | |
6119 | ||
6120 | /* Take a string and run it through the shell parser, returning the | |
6121 | resultant word list. Used by compound array assignment. */ | |
6122 | WORD_LIST * | |
6123 | parse_string_to_word_list (s, flags, whom) | |
6124 | char *s; | |
6125 | int flags; | |
6126 | const char *whom; | |
6127 | { | |
6128 | WORD_LIST *wl; | |
6129 | int tok, orig_current_token, orig_line_number, orig_input_terminator; | |
6130 | int orig_line_count; | |
6131 | int old_echo_input, old_expand_aliases; | |
6132 | #if defined (HISTORY) | |
6133 | int old_remember_on_history, old_history_expansion_inhibited; | |
6134 | #endif | |
6135 | ||
6136 | #if defined (HISTORY) | |
6137 | old_remember_on_history = remember_on_history; | |
6138 | # if defined (BANG_HISTORY) | |
6139 | old_history_expansion_inhibited = history_expansion_inhibited; | |
6140 | # endif | |
6141 | bash_history_disable (); | |
6142 | #endif | |
6143 | ||
6144 | orig_line_number = line_number; | |
6145 | orig_line_count = current_command_line_count; | |
6146 | orig_input_terminator = shell_input_line_terminator; | |
6147 | old_echo_input = echo_input_at_read; | |
6148 | old_expand_aliases = expand_aliases; | |
6149 | ||
6150 | push_stream (1); | |
6151 | last_read_token = WORD; /* WORD to allow reserved words here */ | |
6152 | current_command_line_count = 0; | |
6153 | echo_input_at_read = expand_aliases = 0; | |
6154 | ||
6155 | with_input_from_string (s, whom); | |
6156 | wl = (WORD_LIST *)NULL; | |
6157 | ||
6158 | if (flags & 1) | |
6159 | parser_state |= PST_COMPASSIGN|PST_REPARSE; | |
6160 | ||
6161 | while ((tok = read_token (READ)) != yacc_EOF) | |
6162 | { | |
6163 | if (tok == '\n' && *bash_input.location.string == '\0') | |
6164 | break; | |
6165 | if (tok == '\n') /* Allow newlines in compound assignments */ | |
6166 | continue; | |
6167 | if (tok != WORD && tok != ASSIGNMENT_WORD) | |
6168 | { | |
6169 | line_number = orig_line_number + line_number - 1; | |
6170 | orig_current_token = current_token; | |
6171 | current_token = tok; | |
6172 | yyerror (NULL); /* does the right thing */ | |
6173 | current_token = orig_current_token; | |
6174 | if (wl) | |
6175 | dispose_words (wl); | |
6176 | wl = &parse_string_error; | |
6177 | break; | |
6178 | } | |
6179 | wl = make_word_list (yylval.word, wl); | |
6180 | } | |
6181 | ||
6182 | last_read_token = '\n'; | |
6183 | pop_stream (); | |
6184 | ||
6185 | #if defined (HISTORY) | |
6186 | remember_on_history = old_remember_on_history; | |
6187 | # if defined (BANG_HISTORY) | |
6188 | history_expansion_inhibited = old_history_expansion_inhibited; | |
6189 | # endif /* BANG_HISTORY */ | |
6190 | #endif /* HISTORY */ | |
6191 | ||
6192 | echo_input_at_read = old_echo_input; | |
6193 | expand_aliases = old_expand_aliases; | |
6194 | ||
6195 | current_command_line_count = orig_line_count; | |
6196 | shell_input_line_terminator = orig_input_terminator; | |
6197 | ||
6198 | if (flags & 1) | |
6199 | parser_state &= ~(PST_COMPASSIGN|PST_REPARSE); | |
6200 | ||
6201 | if (wl == &parse_string_error) | |
6202 | { | |
6203 | last_command_exit_value = EXECUTION_FAILURE; | |
6204 | if (interactive_shell == 0 && posixly_correct) | |
6205 | jump_to_top_level (FORCE_EOF); | |
6206 | else | |
6207 | jump_to_top_level (DISCARD); | |
6208 | } | |
6209 | ||
6210 | return (REVERSE_LIST (wl, WORD_LIST *)); | |
6211 | } | |
6212 | ||
6213 | static char * | |
6214 | parse_compound_assignment (retlenp) | |
6215 | int *retlenp; | |
6216 | { | |
6217 | WORD_LIST *wl, *rl; | |
6218 | int tok, orig_line_number, orig_token_size, orig_last_token, assignok; | |
6219 | char *saved_token, *ret; | |
6220 | ||
6221 | saved_token = token; | |
6222 | orig_token_size = token_buffer_size; | |
6223 | orig_line_number = line_number; | |
6224 | orig_last_token = last_read_token; | |
6225 | ||
6226 | last_read_token = WORD; /* WORD to allow reserved words here */ | |
6227 | ||
6228 | token = (char *)NULL; | |
6229 | token_buffer_size = 0; | |
6230 | ||
6231 | assignok = parser_state&PST_ASSIGNOK; /* XXX */ | |
6232 | ||
6233 | wl = (WORD_LIST *)NULL; /* ( */ | |
6234 | parser_state |= PST_COMPASSIGN; | |
6235 | ||
6236 | while ((tok = read_token (READ)) != ')') | |
6237 | { | |
6238 | if (tok == '\n') /* Allow newlines in compound assignments */ | |
6239 | { | |
6240 | if (SHOULD_PROMPT ()) | |
6241 | prompt_again (); | |
6242 | continue; | |
6243 | } | |
6244 | if (tok != WORD && tok != ASSIGNMENT_WORD) | |
6245 | { | |
6246 | current_token = tok; /* for error reporting */ | |
6247 | if (tok == yacc_EOF) /* ( */ | |
6248 | parser_error (orig_line_number, _("unexpected EOF while looking for matching `)'")); | |
6249 | else | |
6250 | yyerror(NULL); /* does the right thing */ | |
6251 | if (wl) | |
6252 | dispose_words (wl); | |
6253 | wl = &parse_string_error; | |
6254 | break; | |
6255 | } | |
6256 | wl = make_word_list (yylval.word, wl); | |
6257 | } | |
6258 | ||
6259 | FREE (token); | |
6260 | token = saved_token; | |
6261 | token_buffer_size = orig_token_size; | |
6262 | ||
6263 | parser_state &= ~PST_COMPASSIGN; | |
6264 | ||
6265 | if (wl == &parse_string_error) | |
6266 | { | |
6267 | last_command_exit_value = EXECUTION_FAILURE; | |
6268 | last_read_token = '\n'; /* XXX */ | |
6269 | if (interactive_shell == 0 && posixly_correct) | |
6270 | jump_to_top_level (FORCE_EOF); | |
6271 | else | |
6272 | jump_to_top_level (DISCARD); | |
6273 | } | |
6274 | ||
6275 | last_read_token = orig_last_token; /* XXX - was WORD? */ | |
6276 | ||
6277 | if (wl) | |
6278 | { | |
6279 | rl = REVERSE_LIST (wl, WORD_LIST *); | |
6280 | ret = string_list (rl); | |
6281 | dispose_words (rl); | |
6282 | } | |
6283 | else | |
6284 | ret = (char *)NULL; | |
6285 | ||
6286 | if (retlenp) | |
6287 | *retlenp = (ret && *ret) ? strlen (ret) : 0; | |
6288 | ||
6289 | if (assignok) | |
6290 | parser_state |= PST_ASSIGNOK; | |
6291 | ||
6292 | return ret; | |
6293 | } | |
6294 | ||
6295 | /************************************************ | |
6296 | * * | |
6297 | * SAVING AND RESTORING PARTIAL PARSE STATE * | |
6298 | * * | |
6299 | ************************************************/ | |
6300 | ||
6301 | sh_parser_state_t * | |
6302 | save_parser_state (ps) | |
6303 | sh_parser_state_t *ps; | |
6304 | { | |
6305 | int i; | |
6306 | ||
6307 | if (ps == 0) | |
6308 | ps = (sh_parser_state_t *)xmalloc (sizeof (sh_parser_state_t)); | |
6309 | if (ps == 0) | |
6310 | return ((sh_parser_state_t *)NULL); | |
6311 | ||
6312 | ps->parser_state = parser_state; | |
6313 | ps->token_state = save_token_state (); | |
6314 | ||
6315 | ps->input_line_terminator = shell_input_line_terminator; | |
6316 | ps->eof_encountered = eof_encountered; | |
6317 | ||
6318 | ps->prompt_string_pointer = prompt_string_pointer; | |
6319 | ||
6320 | ps->current_command_line_count = current_command_line_count; | |
6321 | ||
6322 | #if defined (HISTORY) | |
6323 | ps->remember_on_history = remember_on_history; | |
6324 | # if defined (BANG_HISTORY) | |
6325 | ps->history_expansion_inhibited = history_expansion_inhibited; | |
6326 | # endif | |
6327 | #endif | |
6328 | ||
6329 | ps->last_command_exit_value = last_command_exit_value; | |
6330 | #if defined (ARRAY_VARS) | |
6331 | ps->pipestatus = save_pipestatus_array (); | |
6332 | #endif | |
6333 | ||
6334 | ps->last_shell_builtin = last_shell_builtin; | |
6335 | ps->this_shell_builtin = this_shell_builtin; | |
6336 | ||
6337 | ps->expand_aliases = expand_aliases; | |
6338 | ps->echo_input_at_read = echo_input_at_read; | |
6339 | ps->need_here_doc = need_here_doc; | |
6340 | ps->here_doc_first_line = here_doc_first_line; | |
6341 | ||
6342 | #if 0 | |
6343 | for (i = 0; i < HEREDOC_MAX; i++) | |
6344 | ps->redir_stack[i] = redir_stack[i]; | |
6345 | #else | |
6346 | if (need_here_doc == 0) | |
6347 | ps->redir_stack[0] = 0; | |
6348 | else | |
6349 | memcpy (ps->redir_stack, redir_stack, sizeof (redir_stack[0]) * HEREDOC_MAX); | |
6350 | #endif | |
6351 | ||
6352 | ps->token = token; | |
6353 | ps->token_buffer_size = token_buffer_size; | |
6354 | /* Force reallocation on next call to read_token_word */ | |
6355 | token = 0; | |
6356 | token_buffer_size = 0; | |
6357 | ||
6358 | return (ps); | |
6359 | } | |
6360 | ||
6361 | void | |
6362 | restore_parser_state (ps) | |
6363 | sh_parser_state_t *ps; | |
6364 | { | |
6365 | int i; | |
6366 | ||
6367 | if (ps == 0) | |
6368 | return; | |
6369 | ||
6370 | parser_state = ps->parser_state; | |
6371 | if (ps->token_state) | |
6372 | { | |
6373 | restore_token_state (ps->token_state); | |
6374 | free (ps->token_state); | |
6375 | } | |
6376 | ||
6377 | shell_input_line_terminator = ps->input_line_terminator; | |
6378 | eof_encountered = ps->eof_encountered; | |
6379 | ||
6380 | prompt_string_pointer = ps->prompt_string_pointer; | |
6381 | ||
6382 | current_command_line_count = ps->current_command_line_count; | |
6383 | ||
6384 | #if defined (HISTORY) | |
6385 | remember_on_history = ps->remember_on_history; | |
6386 | # if defined (BANG_HISTORY) | |
6387 | history_expansion_inhibited = ps->history_expansion_inhibited; | |
6388 | # endif | |
6389 | #endif | |
6390 | ||
6391 | last_command_exit_value = ps->last_command_exit_value; | |
6392 | #if defined (ARRAY_VARS) | |
6393 | restore_pipestatus_array (ps->pipestatus); | |
6394 | #endif | |
6395 | ||
6396 | last_shell_builtin = ps->last_shell_builtin; | |
6397 | this_shell_builtin = ps->this_shell_builtin; | |
6398 | ||
6399 | expand_aliases = ps->expand_aliases; | |
6400 | echo_input_at_read = ps->echo_input_at_read; | |
6401 | need_here_doc = ps->need_here_doc; | |
6402 | here_doc_first_line = ps->here_doc_first_line; | |
6403 | ||
6404 | #if 0 | |
6405 | for (i = 0; i < HEREDOC_MAX; i++) | |
6406 | redir_stack[i] = ps->redir_stack[i]; | |
6407 | #else | |
6408 | if (need_here_doc == 0) | |
6409 | redir_stack[0] = 0; | |
6410 | else | |
6411 | memcpy (redir_stack, ps->redir_stack, sizeof (redir_stack[0]) * HEREDOC_MAX); | |
6412 | #endif | |
6413 | ||
6414 | FREE (token); | |
6415 | token = ps->token; | |
6416 | token_buffer_size = ps->token_buffer_size; | |
6417 | } | |
6418 | ||
6419 | sh_input_line_state_t * | |
6420 | save_input_line_state (ls) | |
6421 | sh_input_line_state_t *ls; | |
6422 | { | |
6423 | if (ls == 0) | |
6424 | ls = (sh_input_line_state_t *)xmalloc (sizeof (sh_input_line_state_t)); | |
6425 | if (ls == 0) | |
6426 | return ((sh_input_line_state_t *)NULL); | |
6427 | ||
6428 | ls->input_line = shell_input_line; | |
6429 | ls->input_line_size = shell_input_line_size; | |
6430 | ls->input_line_len = shell_input_line_len; | |
6431 | ls->input_line_index = shell_input_line_index; | |
6432 | ||
6433 | /* force reallocation */ | |
6434 | shell_input_line = 0; | |
6435 | shell_input_line_size = shell_input_line_len = shell_input_line_index = 0; | |
6436 | ||
6437 | return ls; | |
6438 | } | |
6439 | ||
6440 | void | |
6441 | restore_input_line_state (ls) | |
6442 | sh_input_line_state_t *ls; | |
6443 | { | |
6444 | FREE (shell_input_line); | |
6445 | shell_input_line = ls->input_line; | |
6446 | shell_input_line_size = ls->input_line_size; | |
6447 | shell_input_line_len = ls->input_line_len; | |
6448 | shell_input_line_index = ls->input_line_index; | |
6449 | ||
6450 | set_line_mbstate (); | |
6451 | } | |
6452 | ||
6453 | /************************************************ | |
6454 | * * | |
6455 | * MULTIBYTE CHARACTER HANDLING * | |
6456 | * * | |
6457 | ************************************************/ | |
6458 | ||
6459 | #if defined (HANDLE_MULTIBYTE) | |
6460 | static void | |
6461 | set_line_mbstate () | |
6462 | { | |
6463 | int c; | |
6464 | size_t i, previ, len; | |
6465 | mbstate_t mbs, prevs; | |
6466 | size_t mbclen; | |
6467 | ||
6468 | if (shell_input_line == NULL) | |
6469 | return; | |
6470 | len = strlen (shell_input_line); /* XXX - shell_input_line_len ? */ | |
6471 | shell_input_line_property = (char *)xrealloc (shell_input_line_property, len + 1); | |
6472 | ||
6473 | memset (&prevs, '\0', sizeof (mbstate_t)); | |
6474 | for (i = previ = 0; i < len; i++) | |
6475 | { | |
6476 | mbs = prevs; | |
6477 | ||
6478 | c = shell_input_line[i]; | |
6479 | if (c == EOF) | |
6480 | { | |
6481 | size_t j; | |
6482 | for (j = i; j < len; j++) | |
6483 | shell_input_line_property[j] = 1; | |
6484 | break; | |
6485 | } | |
6486 | ||
6487 | mbclen = mbrlen (shell_input_line + previ, i - previ + 1, &mbs); | |
6488 | if (mbclen == 1 || mbclen == (size_t)-1) | |
6489 | { | |
6490 | mbclen = 1; | |
6491 | previ = i + 1; | |
6492 | } | |
6493 | else if (mbclen == (size_t)-2) | |
6494 | mbclen = 0; | |
6495 | else if (mbclen > 1) | |
6496 | { | |
6497 | mbclen = 0; | |
6498 | previ = i + 1; | |
6499 | prevs = mbs; | |
6500 | } | |
6501 | else | |
6502 | { | |
6503 | /* XXX - what to do if mbrlen returns 0? (null wide character) */ | |
6504 | size_t j; | |
6505 | for (j = i; j < len; j++) | |
6506 | shell_input_line_property[j] = 1; | |
6507 | break; | |
6508 | } | |
6509 | ||
6510 | shell_input_line_property[i] = mbclen; | |
6511 | } | |
6512 | } | |
6513 | #endif /* HANDLE_MULTIBYTE */ |