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Commit | Line | Data |
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726f6388 JA |
1 | /* subst.c -- The part of the shell that does parameter, command, and |
2 | globbing substitutions. */ | |
3 | ||
bb70624e JA |
4 | /* ``Have a little faith, there's magic in the night. You ain't a |
5 | beauty, but, hey, you're alright.'' */ | |
6 | ||
726f6388 JA |
7 | /* Copyright (C) 1987,1989 Free Software Foundation, Inc. |
8 | ||
9 | This file is part of GNU Bash, the Bourne Again SHell. | |
10 | ||
11 | Bash is free software; you can redistribute it and/or modify it under | |
12 | the terms of the GNU General Public License as published by the Free | |
13 | Software Foundation; either version 2, or (at your option) any later | |
14 | version. | |
15 | ||
16 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
17 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
18 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | for more details. | |
20 | ||
21 | You should have received a copy of the GNU General Public License along | |
22 | with Bash; see the file COPYING. If not, write to the Free Software | |
bb70624e | 23 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
726f6388 | 24 | |
ccc6cda3 JA |
25 | #include "config.h" |
26 | ||
726f6388 JA |
27 | #include "bashtypes.h" |
28 | #include <stdio.h> | |
29 | #include <pwd.h> | |
30 | #include <signal.h> | |
31 | #include <errno.h> | |
ccc6cda3 JA |
32 | |
33 | #if defined (HAVE_UNISTD_H) | |
34 | # include <unistd.h> | |
35 | #endif | |
726f6388 JA |
36 | |
37 | #include "bashansi.h" | |
38 | #include "posixstat.h" | |
39 | ||
40 | #include "shell.h" | |
41 | #include "flags.h" | |
42 | #include "jobs.h" | |
43 | #include "execute_cmd.h" | |
44 | #include "filecntl.h" | |
ccc6cda3 JA |
45 | #include "trap.h" |
46 | #include "pathexp.h" | |
47 | #include "mailcheck.h" | |
48 | ||
d166f048 JA |
49 | #if !defined (HAVE_RESTARTABLE_SYSCALLS) /* for getc_with_restart */ |
50 | #include "input.h" | |
51 | #endif | |
52 | ||
ccc6cda3 JA |
53 | #include "builtins/getopt.h" |
54 | #include "builtins/common.h" | |
726f6388 | 55 | |
cce855bc | 56 | #include <tilde/tilde.h> |
726f6388 | 57 | #include <glob/fnmatch.h> |
ccc6cda3 JA |
58 | |
59 | #if !defined (errno) | |
60 | extern int errno; | |
61 | #endif /* !errno */ | |
726f6388 JA |
62 | |
63 | /* The size that strings change by. */ | |
d166f048 | 64 | #define DEFAULT_INITIAL_ARRAY_SIZE 112 |
ccc6cda3 JA |
65 | #define DEFAULT_ARRAY_SIZE 128 |
66 | ||
67 | /* Variable types. */ | |
68 | #define VT_VARIABLE 0 | |
69 | #define VT_POSPARMS 1 | |
70 | #define VT_ARRAYVAR 2 | |
d166f048 | 71 | #define VT_ARRAYMEMBER 3 |
726f6388 | 72 | |
ccc6cda3 JA |
73 | /* Flags for quoted_strchr */ |
74 | #define ST_BACKSL 0x01 | |
75 | #define ST_CTLESC 0x02 | |
76 | ||
cce855bc JA |
77 | /* These defs make it easier to use the editor. */ |
78 | #define LBRACE '{' | |
79 | #define RBRACE '}' | |
80 | #define LPAREN '(' | |
81 | #define RPAREN ')' | |
726f6388 | 82 | |
bb70624e JA |
83 | /* Evaluates to 1 if this is one of the shell's special variables. */ |
84 | #define SPECIAL_VAR(name, wi) \ | |
85 | ((digit (*name) && all_digits (name)) || \ | |
86 | (name[1] == '\0' && member (*name, "#-?$!@*")) || \ | |
87 | (wi && name[2] == '\0' && member (name[1], "#?@*"))) | |
88 | ||
726f6388 JA |
89 | /* Process ID of the last command executed within command substitution. */ |
90 | pid_t last_command_subst_pid = NO_PID; | |
b72432fd | 91 | pid_t current_command_subst_pid = NO_PID; |
726f6388 JA |
92 | |
93 | /* Extern functions and variables from different files. */ | |
94 | extern int last_command_exit_value, interactive, interactive_shell; | |
ccc6cda3 | 95 | extern int subshell_environment, startup_state; |
bb70624e | 96 | extern int return_catch_flag, return_catch_value; |
ccc6cda3 | 97 | extern int dollar_dollar_pid; |
726f6388 | 98 | extern int posixly_correct; |
726f6388 | 99 | extern char *this_command_name; |
ccc6cda3 | 100 | extern struct fd_bitmap *current_fds_to_close; |
cce855bc | 101 | extern int wordexp_only; |
726f6388 | 102 | |
ccc6cda3 JA |
103 | extern void getopts_reset (); |
104 | ||
105 | /* Non-zero means to allow unmatched globbed filenames to expand to | |
106 | a null file. */ | |
107 | int allow_null_glob_expansion; | |
108 | ||
109 | /* Variables to keep track of which words in an expanded word list (the | |
110 | output of expand_word_list_internal) are the result of globbing | |
111 | expansions. GLOB_ARGV_FLAGS is used by execute_cmd.c. */ | |
112 | char *glob_argv_flags; | |
113 | static int glob_argv_flags_size; | |
726f6388 JA |
114 | |
115 | static WORD_LIST expand_word_error, expand_word_fatal; | |
116 | static char expand_param_error, expand_param_fatal; | |
117 | ||
b72432fd | 118 | static int doing_completion = 0; |
bb70624e JA |
119 | static int doing_prompt_expansion = 0; |
120 | ||
121 | /* Used to hold a list of variable assignments preceding a command. Global | |
122 | so the SIGCHLD handler in jobs.c can unwind-protect it when it runs a | |
123 | SIGCHLD trap. */ | |
124 | WORD_LIST *subst_assign_varlist = (WORD_LIST *)NULL; | |
125 | /* A WORD_LIST of words to be expanded by expand_word_list_internal, | |
126 | without any leading variable assignments. */ | |
127 | static WORD_LIST *garglist = (WORD_LIST *)NULL; | |
b72432fd | 128 | |
cce855bc JA |
129 | static char *make_quoted_char (); |
130 | static void remove_quoted_nulls (); | |
131 | static char *param_expand (); | |
132 | static char *maybe_expand_string (); | |
133 | static WORD_LIST *call_expand_word_internal (); | |
726f6388 | 134 | static WORD_LIST *expand_string_internal (); |
ccc6cda3 | 135 | static WORD_LIST *expand_word_internal (), *expand_word_list_internal (); |
726f6388 | 136 | static WORD_LIST *expand_string_leave_quoted (); |
ccc6cda3 | 137 | static WORD_LIST *expand_string_for_rhs (); |
b72432fd | 138 | static char *getifs (); |
726f6388 | 139 | static WORD_LIST *word_list_split (); |
ccc6cda3 | 140 | static WORD_LIST *quote_list (), *dequote_list (); |
cce855bc JA |
141 | static char *quote_escapes (); |
142 | static WORD_LIST *list_quote_escapes (); | |
726f6388 | 143 | static int unquoted_substring (), unquoted_member (); |
726f6388 JA |
144 | static int do_assignment_internal (); |
145 | static char *string_extract_verbatim (), *string_extract (); | |
146 | static char *string_extract_double_quoted (), *string_extract_single_quoted (); | |
cce855bc JA |
147 | static char *string_list_dollar_at (), *string_list_dollar_star (); |
148 | static inline int skip_single_quoted (), skip_double_quoted (); | |
726f6388 JA |
149 | static char *extract_delimited_string (); |
150 | static char *extract_dollar_brace_string (); | |
151 | ||
152 | /* **************************************************************** */ | |
153 | /* */ | |
154 | /* Utility Functions */ | |
155 | /* */ | |
156 | /* **************************************************************** */ | |
157 | ||
158 | /* Cons a new string from STRING starting at START and ending at END, | |
159 | not including END. */ | |
160 | char * | |
161 | substring (string, start, end) | |
162 | char *string; | |
163 | int start, end; | |
164 | { | |
ccc6cda3 JA |
165 | register int len; |
166 | register char *result; | |
726f6388 | 167 | |
ccc6cda3 JA |
168 | len = end - start; |
169 | result = xmalloc (len + 1); | |
726f6388 JA |
170 | strncpy (result, string + start, len); |
171 | result[len] = '\0'; | |
172 | return (result); | |
173 | } | |
174 | ||
ccc6cda3 JA |
175 | static char * |
176 | quoted_substring (string, start, end) | |
177 | char *string; | |
178 | int start, end; | |
179 | { | |
180 | register int len, l; | |
181 | register char *result, *s, *r; | |
182 | ||
183 | len = end - start; | |
184 | ||
185 | /* Move to string[start], skipping quoted characters. */ | |
186 | for (s = string, l = 0; *s && l < start; ) | |
187 | { | |
188 | if (*s == CTLESC) | |
189 | { | |
190 | s++; | |
191 | continue; | |
192 | } | |
193 | l++; | |
194 | if (*s == 0) | |
195 | break; | |
196 | } | |
197 | ||
198 | r = result = xmalloc (2*len + 1); /* save room for quotes */ | |
199 | ||
200 | /* Copy LEN characters, including quote characters. */ | |
201 | s = string + l; | |
202 | for (l = 0; l < len; s++) | |
203 | { | |
204 | if (*s == CTLESC) | |
205 | *r++ = *s++; | |
206 | *r++ = *s; | |
207 | l++; | |
208 | if (*s == 0) | |
209 | break; | |
210 | } | |
211 | *r = '\0'; | |
212 | return result; | |
213 | } | |
214 | ||
215 | /* Find the first occurrence of character C in string S, obeying shell | |
216 | quoting rules. If (FLAGS & ST_BACKSL) is non-zero, backslash-escaped | |
217 | characters are skipped. If (FLAGS & ST_CTLESC) is non-zero, characters | |
218 | escaped with CTLESC are skipped. */ | |
219 | static inline char * | |
220 | quoted_strchr (s, c, flags) | |
221 | char *s; | |
222 | int c, flags; | |
223 | { | |
224 | register char *p; | |
225 | ||
226 | for (p = s; *p; p++) | |
227 | { | |
228 | if (((flags & ST_BACKSL) && *p == '\\') | |
229 | || ((flags & ST_CTLESC) && *p == CTLESC)) | |
230 | { | |
231 | p++; | |
232 | if (*p == '\0') | |
233 | return ((char *)NULL); | |
234 | continue; | |
235 | } | |
236 | else if (*p == c) | |
237 | return p; | |
238 | } | |
239 | return ((char *)NULL); | |
240 | } | |
241 | ||
cce855bc JA |
242 | /* Return 1 if CHARACTER appears in an unquoted portion of |
243 | STRING. Return 0 otherwise. */ | |
244 | static int | |
245 | unquoted_member (character, string) | |
246 | int character; | |
726f6388 JA |
247 | char *string; |
248 | { | |
cce855bc | 249 | int sindex, c; |
726f6388 | 250 | |
cce855bc | 251 | for (sindex = 0; c = string[sindex]; ) |
726f6388 | 252 | { |
cce855bc JA |
253 | if (c == character) |
254 | return (1); | |
255 | ||
256 | switch (c) | |
ccc6cda3 | 257 | { |
cce855bc JA |
258 | default: |
259 | sindex++; | |
260 | break; | |
261 | ||
262 | case '\\': | |
263 | sindex++; | |
264 | if (string[sindex]) | |
265 | sindex++; | |
266 | break; | |
267 | ||
268 | case '\'': | |
269 | sindex = skip_single_quoted (string, ++sindex); | |
270 | break; | |
271 | ||
272 | case '"': | |
273 | sindex = skip_double_quoted (string, ++sindex); | |
274 | break; | |
ccc6cda3 | 275 | } |
726f6388 | 276 | } |
cce855bc | 277 | return (0); |
726f6388 JA |
278 | } |
279 | ||
cce855bc JA |
280 | /* Return 1 if SUBSTR appears in an unquoted portion of STRING. */ |
281 | static int | |
282 | unquoted_substring (substr, string) | |
283 | char *substr, *string; | |
726f6388 | 284 | { |
cce855bc | 285 | int sindex, c, sublen; |
726f6388 | 286 | |
cce855bc JA |
287 | if (substr == 0 || *substr == '\0') |
288 | return (0); | |
289 | ||
290 | sublen = strlen (substr); | |
291 | for (sindex = 0; c = string[sindex]; ) | |
726f6388 | 292 | { |
cce855bc JA |
293 | if (STREQN (string + sindex, substr, sublen)) |
294 | return (1); | |
295 | ||
296 | switch (c) | |
297 | { | |
298 | case '\\': | |
299 | sindex++; | |
300 | ||
301 | if (string[sindex]) | |
302 | sindex++; | |
303 | break; | |
304 | ||
305 | case '\'': | |
306 | sindex = skip_single_quoted (string, ++sindex); | |
307 | break; | |
308 | ||
309 | case '"': | |
310 | sindex = skip_double_quoted (string, ++sindex); | |
311 | break; | |
312 | ||
313 | default: | |
314 | sindex++; | |
315 | break; | |
316 | } | |
726f6388 | 317 | } |
cce855bc | 318 | return (0); |
ccc6cda3 | 319 | } |
726f6388 | 320 | |
cce855bc JA |
321 | /* Most of the substitutions must be done in parallel. In order |
322 | to avoid using tons of unclear goto's, I have some functions | |
323 | for manipulating malloc'ed strings. They all take INDX, a | |
324 | pointer to an integer which is the offset into the string | |
325 | where manipulation is taking place. They also take SIZE, a | |
326 | pointer to an integer which is the current length of the | |
327 | character array for this string. */ | |
726f6388 | 328 | |
cce855bc JA |
329 | /* Append SOURCE to TARGET at INDEX. SIZE is the current amount |
330 | of space allocated to TARGET. SOURCE can be NULL, in which | |
331 | case nothing happens. Gets rid of SOURCE by freeing it. | |
332 | Returns TARGET in case the location has changed. */ | |
333 | inline char * | |
334 | sub_append_string (source, target, indx, size) | |
335 | char *source, *target; | |
336 | int *indx, *size; | |
337 | { | |
338 | if (source) | |
726f6388 | 339 | { |
cce855bc JA |
340 | int srclen, n; |
341 | ||
342 | srclen = STRLEN (source); | |
343 | if (srclen >= (int)(*size - *indx)) | |
726f6388 | 344 | { |
cce855bc JA |
345 | n = srclen + *indx; |
346 | n = (n + DEFAULT_ARRAY_SIZE) - (n % DEFAULT_ARRAY_SIZE); | |
347 | target = xrealloc (target, (*size = n)); | |
726f6388 | 348 | } |
cce855bc JA |
349 | |
350 | FASTCOPY (source, target + *indx, srclen); | |
351 | *indx += srclen; | |
352 | target[*indx] = '\0'; | |
353 | ||
354 | free (source); | |
726f6388 | 355 | } |
cce855bc JA |
356 | return (target); |
357 | } | |
358 | ||
359 | #if 0 | |
360 | /* UNUSED */ | |
361 | /* Append the textual representation of NUMBER to TARGET. | |
362 | INDX and SIZE are as in SUB_APPEND_STRING. */ | |
363 | char * | |
364 | sub_append_number (number, target, indx, size) | |
365 | int number, *indx, *size; | |
366 | char *target; | |
367 | { | |
368 | char *temp; | |
369 | ||
370 | temp = itos (number); | |
371 | return (sub_append_string (temp, target, indx, size)); | |
726f6388 | 372 | } |
d166f048 | 373 | #endif |
726f6388 JA |
374 | |
375 | /* Extract a substring from STRING, starting at SINDEX and ending with | |
376 | one of the characters in CHARLIST. Don't make the ending character | |
377 | part of the string. Leave SINDEX pointing at the ending character. | |
ccc6cda3 JA |
378 | Understand about backslashes in the string. If VARNAME is non-zero, |
379 | and array variables have been compiled into the shell, everything | |
380 | between a `[' and a corresponding `]' is skipped over. */ | |
726f6388 | 381 | static char * |
ccc6cda3 | 382 | string_extract (string, sindex, charlist, varname) |
726f6388 | 383 | char *string, *charlist; |
ccc6cda3 | 384 | int *sindex, varname; |
726f6388 | 385 | { |
ccc6cda3 | 386 | register int c, i; |
726f6388 JA |
387 | char *temp; |
388 | ||
ccc6cda3 | 389 | for (i = *sindex; c = string[i]; i++) |
726f6388 JA |
390 | { |
391 | if (c == '\\') | |
392 | if (string[i + 1]) | |
393 | i++; | |
394 | else | |
395 | break; | |
ccc6cda3 JA |
396 | #if defined (ARRAY_VARS) |
397 | else if (varname && c == '[') | |
398 | { | |
399 | int ni; | |
400 | /* If this is an array subscript, skip over it and continue. */ | |
401 | ni = skipsubscript (string, i); | |
402 | if (string[ni] == ']') | |
403 | i = ni; | |
404 | } | |
405 | #endif | |
406 | else if (MEMBER (c, charlist)) | |
726f6388 | 407 | break; |
726f6388 | 408 | } |
bb70624e JA |
409 | |
410 | temp = substring (string, *sindex, i); | |
726f6388 JA |
411 | *sindex = i; |
412 | return (temp); | |
413 | } | |
414 | ||
ccc6cda3 JA |
415 | /* Extract the contents of STRING as if it is enclosed in double quotes. |
416 | SINDEX, when passed in, is the offset of the character immediately | |
417 | following the opening double quote; on exit, SINDEX is left pointing after | |
418 | the closing double quote. If STRIPDQ is non-zero, unquoted double | |
419 | quotes are stripped and the string is terminated by a null byte. | |
420 | Backslashes between the embedded double quotes are processed. If STRIPDQ | |
421 | is zero, an unquoted `"' terminates the string. */ | |
422 | static inline char * | |
423 | string_extract_double_quoted (string, sindex, stripdq) | |
726f6388 | 424 | char *string; |
ccc6cda3 | 425 | int *sindex, stripdq; |
726f6388 | 426 | { |
ccc6cda3 JA |
427 | int c, j, i, t; |
428 | char *temp, *ret; /* The new string we return. */ | |
429 | int pass_next, backquote, si; /* State variables for the machine. */ | |
430 | int dquote; | |
726f6388 | 431 | |
ccc6cda3 JA |
432 | pass_next = backquote = dquote = 0; |
433 | temp = xmalloc (1 + strlen (string) - *sindex); | |
726f6388 | 434 | |
ccc6cda3 | 435 | for (j = 0, i = *sindex; c = string[i]; i++) |
726f6388 | 436 | { |
ccc6cda3 JA |
437 | /* Process a character that was quoted by a backslash. */ |
438 | if (pass_next) | |
726f6388 | 439 | { |
ccc6cda3 | 440 | /* Posix.2 sez: |
726f6388 | 441 | |
ccc6cda3 JA |
442 | ``The backslash shall retain its special meaning as an escape |
443 | character only when followed by one of the characters: | |
444 | $ ` " \ <newline>''. | |
726f6388 | 445 | |
ccc6cda3 JA |
446 | If STRIPDQ is zero, we handle the double quotes here and let |
447 | expand_word_internal handle the rest. If STRIPDQ is non-zero, | |
448 | we have already been through one round of backslash stripping, | |
449 | and want to strip these backslashes only if DQUOTE is non-zero, | |
450 | indicating that we are inside an embedded double-quoted string. */ | |
451 | ||
452 | /* If we are in an embedded quoted string, then don't strip | |
453 | backslashes before characters for which the backslash | |
454 | retains its special meaning, but remove backslashes in | |
455 | front of other characters. If we are not in an | |
456 | embedded quoted string, don't strip backslashes at all. | |
457 | This mess is necessary because the string was already | |
458 | surrounded by double quotes (and sh has some really weird | |
459 | quoting rules). | |
460 | The returned string will be run through expansion as if | |
461 | it were double-quoted. */ | |
462 | if ((stripdq == 0 && c != '"') || | |
463 | (stripdq && ((dquote && strchr (slashify_in_quotes, c)) || dquote == 0))) | |
464 | temp[j++] = '\\'; | |
465 | temp[j++] = c; | |
466 | pass_next = 0; | |
467 | continue; | |
468 | } | |
726f6388 | 469 | |
ccc6cda3 JA |
470 | /* A backslash protects the next character. The code just above |
471 | handles preserving the backslash in front of any character but | |
472 | a double quote. */ | |
473 | if (c == '\\') | |
726f6388 | 474 | { |
ccc6cda3 | 475 | pass_next++; |
726f6388 JA |
476 | continue; |
477 | } | |
478 | ||
ccc6cda3 JA |
479 | /* Inside backquotes, ``the portion of the quoted string from the |
480 | initial backquote and the characters up to the next backquote | |
481 | that is not preceded by a backslash, having escape characters | |
482 | removed, defines that command''. */ | |
483 | if (backquote) | |
726f6388 | 484 | { |
ccc6cda3 JA |
485 | if (c == '`') |
486 | backquote = 0; | |
487 | temp[j++] = c; | |
726f6388 JA |
488 | continue; |
489 | } | |
490 | ||
ccc6cda3 | 491 | if (c == '`') |
726f6388 | 492 | { |
ccc6cda3 JA |
493 | temp[j++] = c; |
494 | backquote++; | |
495 | continue; | |
726f6388 JA |
496 | } |
497 | ||
ccc6cda3 JA |
498 | /* Pass everything between `$(' and the matching `)' or a quoted |
499 | ${ ... } pair through according to the Posix.2 specification. */ | |
cce855bc | 500 | if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE))) |
726f6388 | 501 | { |
ccc6cda3 | 502 | si = i + 2; |
cce855bc JA |
503 | if (string[i + 1] == LPAREN) |
504 | ret = extract_delimited_string (string, &si, "$(", "(", ")"); /*)*/ | |
ccc6cda3 JA |
505 | else |
506 | ret = extract_dollar_brace_string (string, &si, 1); | |
726f6388 | 507 | |
ccc6cda3 JA |
508 | temp[j++] = '$'; |
509 | temp[j++] = string[i + 1]; | |
726f6388 | 510 | |
ccc6cda3 JA |
511 | for (t = 0; ret[t]; t++, j++) |
512 | temp[j] = ret[t]; | |
513 | temp[j++] = string[si]; | |
726f6388 | 514 | |
ccc6cda3 JA |
515 | i = si; |
516 | free (ret); | |
517 | continue; | |
726f6388 JA |
518 | } |
519 | ||
ccc6cda3 JA |
520 | /* Add any character but a double quote to the quoted string we're |
521 | accumulating. */ | |
522 | if (c != '"') | |
726f6388 | 523 | { |
ccc6cda3 | 524 | temp[j++] = c; |
726f6388 JA |
525 | continue; |
526 | } | |
ccc6cda3 JA |
527 | |
528 | /* c == '"' */ | |
529 | if (stripdq) | |
726f6388 | 530 | { |
ccc6cda3 JA |
531 | dquote ^= 1; |
532 | continue; | |
726f6388 | 533 | } |
ccc6cda3 JA |
534 | |
535 | break; | |
726f6388 | 536 | } |
ccc6cda3 | 537 | temp[j] = '\0'; |
726f6388 | 538 | |
ccc6cda3 JA |
539 | /* Point to after the closing quote. */ |
540 | if (c) | |
541 | i++; | |
726f6388 JA |
542 | *sindex = i; |
543 | ||
ccc6cda3 JA |
544 | return (temp); |
545 | } | |
546 | ||
547 | /* This should really be another option to string_extract_double_quoted. */ | |
548 | static inline int | |
549 | skip_double_quoted (string, sind) | |
550 | char *string; | |
551 | int sind; | |
552 | { | |
553 | int c, j, i; | |
554 | char *ret; | |
555 | int pass_next, backquote, si; | |
556 | ||
557 | pass_next = backquote = 0; | |
558 | ||
559 | for (j = 0, i = sind; c = string[i]; i++) | |
726f6388 | 560 | { |
ccc6cda3 JA |
561 | if (pass_next) |
562 | { | |
563 | pass_next = 0; | |
564 | continue; | |
565 | } | |
566 | else if (c == '\\') | |
567 | { | |
568 | pass_next++; | |
569 | continue; | |
570 | } | |
571 | else if (backquote) | |
572 | { | |
573 | if (c == '`') | |
574 | backquote = 0; | |
575 | continue; | |
576 | } | |
577 | else if (c == '`') | |
578 | { | |
579 | backquote++; | |
580 | continue; | |
581 | } | |
cce855bc | 582 | else if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE))) |
ccc6cda3 JA |
583 | { |
584 | si = i + 2; | |
cce855bc | 585 | if (string[i + 1] == LPAREN) |
ccc6cda3 JA |
586 | ret = extract_delimited_string (string, &si, "$(", "(", ")"); |
587 | else | |
588 | ret = extract_dollar_brace_string (string, &si, 0); | |
589 | ||
590 | i = si; | |
591 | free (ret); | |
592 | continue; | |
593 | } | |
594 | else if (c != '"') | |
595 | continue; | |
596 | else | |
597 | break; | |
726f6388 | 598 | } |
ccc6cda3 JA |
599 | |
600 | if (c) | |
601 | i++; | |
602 | ||
603 | return (i); | |
726f6388 JA |
604 | } |
605 | ||
ccc6cda3 JA |
606 | /* Extract the contents of STRING as if it is enclosed in single quotes. |
607 | SINDEX, when passed in, is the offset of the character immediately | |
608 | following the opening single quote; on exit, SINDEX is left pointing after | |
609 | the closing single quote. */ | |
610 | static inline char * | |
611 | string_extract_single_quoted (string, sindex) | |
612 | char *string; | |
613 | int *sindex; | |
614 | { | |
615 | register int i, j; | |
616 | char *t; | |
617 | ||
618 | for (i = *sindex; string[i] && string[i] != '\''; i++) | |
619 | ; | |
620 | ||
bb70624e | 621 | t = substring (string, *sindex, i); |
ccc6cda3 JA |
622 | |
623 | if (string[i]) | |
624 | i++; | |
625 | *sindex = i; | |
626 | ||
627 | return (t); | |
628 | } | |
629 | ||
630 | static inline int | |
631 | skip_single_quoted (string, sind) | |
632 | char *string; | |
633 | int sind; | |
634 | { | |
635 | register int i; | |
636 | ||
637 | for (i = sind; string[i] && string[i] != '\''; i++) | |
638 | ; | |
639 | if (string[i]) | |
640 | i++; | |
641 | return i; | |
642 | } | |
643 | ||
644 | /* Just like string_extract, but doesn't hack backslashes or any of | |
bb70624e | 645 | that other stuff. Obeys CTLESC quoting. Used to do splitting on $IFS. */ |
726f6388 | 646 | static char * |
ccc6cda3 JA |
647 | string_extract_verbatim (string, sindex, charlist) |
648 | char *string, *charlist; | |
649 | int *sindex; | |
650 | { | |
651 | register int i = *sindex; | |
652 | int c; | |
653 | char *temp; | |
654 | ||
655 | if (charlist[0] == '\'' && charlist[1] == '\0') | |
656 | { | |
657 | temp = string_extract_single_quoted (string, sindex); | |
658 | --*sindex; /* leave *sindex at separator character */ | |
659 | return temp; | |
660 | } | |
661 | ||
662 | for (i = *sindex; c = string[i]; i++) | |
663 | { | |
664 | if (c == CTLESC) | |
665 | { | |
666 | i++; | |
667 | continue; | |
668 | } | |
669 | ||
670 | if (MEMBER (c, charlist)) | |
671 | break; | |
672 | } | |
673 | ||
bb70624e | 674 | temp = substring (string, *sindex, i); |
ccc6cda3 JA |
675 | *sindex = i; |
676 | ||
677 | return (temp); | |
678 | } | |
679 | ||
680 | /* Extract the $( construct in STRING, and return a new string. | |
681 | Start extracting at (SINDEX) as if we had just seen "$(". | |
682 | Make (SINDEX) get the position of the matching ")". */ | |
683 | char * | |
684 | extract_command_subst (string, sindex) | |
726f6388 JA |
685 | char *string; |
686 | int *sindex; | |
687 | { | |
ccc6cda3 JA |
688 | return (extract_delimited_string (string, sindex, "$(", "(", ")")); |
689 | } | |
690 | ||
691 | /* Extract the $[ construct in STRING, and return a new string. | |
692 | Start extracting at (SINDEX) as if we had just seen "$[". | |
693 | Make (SINDEX) get the position of the matching "]". */ | |
694 | char * | |
695 | extract_arithmetic_subst (string, sindex) | |
696 | char *string; | |
697 | int *sindex; | |
698 | { | |
699 | return (extract_delimited_string (string, sindex, "$[", "[", "]")); | |
700 | } | |
701 | ||
702 | #if defined (PROCESS_SUBSTITUTION) | |
703 | /* Extract the <( or >( construct in STRING, and return a new string. | |
704 | Start extracting at (SINDEX) as if we had just seen "<(". | |
cce855bc | 705 | Make (SINDEX) get the position of the matching ")". */ /*))*/ |
ccc6cda3 JA |
706 | char * |
707 | extract_process_subst (string, starter, sindex) | |
708 | char *string; | |
709 | char *starter; | |
710 | int *sindex; | |
711 | { | |
712 | return (extract_delimited_string (string, sindex, starter, "(", ")")); | |
713 | } | |
714 | #endif /* PROCESS_SUBSTITUTION */ | |
715 | ||
716 | #if defined (ARRAY_VARS) | |
717 | char * | |
718 | extract_array_assignment_list (string, sindex) | |
719 | char *string; | |
720 | int *sindex; | |
721 | { | |
722 | return (extract_delimited_string (string, sindex, "(", (char *)NULL, ")")); | |
723 | } | |
724 | #endif | |
725 | ||
726 | /* Extract and create a new string from the contents of STRING, a | |
727 | character string delimited with OPENER and CLOSER. SINDEX is | |
728 | the address of an int describing the current offset in STRING; | |
729 | it should point to just after the first OPENER found. On exit, | |
730 | SINDEX gets the position of the last character of the matching CLOSER. | |
731 | If OPENER is more than a single character, ALT_OPENER, if non-null, | |
732 | contains a character string that can also match CLOSER and thus | |
733 | needs to be skipped. */ | |
734 | static char * | |
735 | extract_delimited_string (string, sindex, opener, alt_opener, closer) | |
736 | char *string; | |
737 | int *sindex; | |
738 | char *opener, *alt_opener, *closer; | |
739 | { | |
740 | int i, c, si; | |
741 | char *t, *result; | |
726f6388 | 742 | int pass_character, nesting_level; |
ccc6cda3 JA |
743 | int len_closer, len_opener, len_alt_opener; |
744 | ||
745 | len_opener = STRLEN (opener); | |
746 | len_alt_opener = STRLEN (alt_opener); | |
747 | len_closer = STRLEN (closer); | |
726f6388 | 748 | |
ccc6cda3 | 749 | pass_character = 0; |
726f6388 JA |
750 | |
751 | nesting_level = 1; | |
ccc6cda3 | 752 | i = *sindex; |
726f6388 | 753 | |
ccc6cda3 | 754 | while (nesting_level) |
726f6388 | 755 | { |
ccc6cda3 JA |
756 | c = string[i]; |
757 | ||
758 | if (c == 0) | |
759 | break; | |
760 | ||
761 | if (pass_character) /* previous char was backslash */ | |
726f6388 JA |
762 | { |
763 | pass_character = 0; | |
ccc6cda3 | 764 | i++; |
726f6388 JA |
765 | continue; |
766 | } | |
767 | ||
768 | if (c == CTLESC) | |
769 | { | |
770 | pass_character++; | |
ccc6cda3 | 771 | i++; |
726f6388 JA |
772 | continue; |
773 | } | |
774 | ||
ccc6cda3 JA |
775 | #if 0 |
776 | if (c == '\\' && delimiter == '"' && | |
777 | (member (string[i], slashify_in_quotes))) | |
778 | #else | |
726f6388 | 779 | if (c == '\\') |
ccc6cda3 | 780 | #endif |
726f6388 | 781 | { |
ccc6cda3 JA |
782 | pass_character++; |
783 | i++; | |
784 | continue; | |
726f6388 JA |
785 | } |
786 | ||
ccc6cda3 JA |
787 | /* Process a nested OPENER. */ |
788 | if (STREQN (string + i, opener, len_opener)) | |
726f6388 | 789 | { |
ccc6cda3 JA |
790 | si = i + len_opener; |
791 | t = extract_delimited_string (string, &si, opener, alt_opener, closer); | |
792 | i = si + 1; | |
793 | FREE (t); | |
794 | continue; | |
726f6388 JA |
795 | } |
796 | ||
ccc6cda3 JA |
797 | /* Process a nested ALT_OPENER */ |
798 | if (len_alt_opener && STREQN (string + i, alt_opener, len_alt_opener)) | |
726f6388 | 799 | { |
ccc6cda3 JA |
800 | si = i + len_alt_opener; |
801 | t = extract_delimited_string (string, &si, alt_opener, alt_opener, closer); | |
802 | i = si + 1; | |
803 | FREE (t); | |
726f6388 JA |
804 | continue; |
805 | } | |
ccc6cda3 JA |
806 | |
807 | /* If the current substring terminates the delimited string, decrement | |
808 | the nesting level. */ | |
809 | if (STREQN (string + i, closer, len_closer)) | |
726f6388 | 810 | { |
ccc6cda3 JA |
811 | i += len_closer - 1; /* move to last char of the closer */ |
812 | nesting_level--; | |
813 | if (nesting_level == 0) | |
814 | break; | |
726f6388 | 815 | } |
ccc6cda3 JA |
816 | |
817 | /* Pass old-style command substitution through verbatim. */ | |
818 | if (c == '`') | |
819 | { | |
820 | si = i + 1; | |
821 | t = string_extract (string, &si, "`", 0); | |
822 | i = si + 1; | |
823 | FREE (t); | |
824 | continue; | |
825 | } | |
826 | ||
827 | /* Pass single-quoted strings through verbatim. */ | |
828 | if (c == '\'') | |
829 | { | |
830 | si = i + 1; | |
831 | i = skip_single_quoted (string, si); | |
832 | continue; | |
833 | } | |
834 | ||
835 | /* Pass embedded double-quoted strings through verbatim as well. */ | |
836 | if (c == '"') | |
837 | { | |
838 | si = i + 1; | |
839 | i = skip_double_quoted (string, si); | |
840 | continue; | |
841 | } | |
842 | ||
843 | i++; /* move past this character, which was not special. */ | |
726f6388 JA |
844 | } |
845 | ||
bb70624e | 846 | #if 0 |
ccc6cda3 | 847 | if (c == 0 && nesting_level) |
bb70624e JA |
848 | #else |
849 | if (c == 0 && nesting_level && doing_completion == 0) | |
850 | #endif | |
726f6388 | 851 | { |
ccc6cda3 | 852 | report_error ("bad substitution: no `%s' in %s", closer, string); |
ccc6cda3 | 853 | jump_to_top_level (DISCARD); |
726f6388 | 854 | } |
ccc6cda3 | 855 | |
cce855bc JA |
856 | si = i - *sindex - len_closer + 1; |
857 | result = xmalloc (1 + si); | |
858 | strncpy (result, string + *sindex, si); | |
859 | result[si] = '\0'; | |
860 | *sindex = i; | |
861 | ||
726f6388 JA |
862 | return (result); |
863 | } | |
864 | ||
ccc6cda3 JA |
865 | /* Extract a parameter expansion expression within ${ and } from STRING. |
866 | Obey the Posix.2 rules for finding the ending `}': count braces while | |
867 | skipping over enclosed quoted strings and command substitutions. | |
868 | SINDEX is the address of an int describing the current offset in STRING; | |
869 | it should point to just after the first `{' found. On exit, SINDEX | |
870 | gets the position of the matching `}'. QUOTED is non-zero if this | |
871 | occurs inside double quotes. */ | |
872 | /* XXX -- this is very similar to extract_delimited_string -- XXX */ | |
726f6388 | 873 | static char * |
ccc6cda3 | 874 | extract_dollar_brace_string (string, sindex, quoted) |
726f6388 | 875 | char *string; |
ccc6cda3 | 876 | int *sindex, quoted; |
726f6388 | 877 | { |
ccc6cda3 JA |
878 | register int i, c, l; |
879 | int pass_character, nesting_level, si; | |
880 | char *result, *t; | |
726f6388 | 881 | |
ccc6cda3 | 882 | pass_character = 0; |
726f6388 | 883 | |
ccc6cda3 JA |
884 | nesting_level = 1; |
885 | ||
886 | for (i = *sindex; (c = string[i]); i++) | |
726f6388 | 887 | { |
ccc6cda3 | 888 | if (pass_character) |
726f6388 | 889 | { |
ccc6cda3 JA |
890 | pass_character = 0; |
891 | continue; | |
892 | } | |
726f6388 | 893 | |
cce855bc JA |
894 | /* CTLESCs and backslashes quote the next character. */ |
895 | if (c == CTLESC || c == '\\') | |
726f6388 | 896 | { |
ccc6cda3 | 897 | pass_character++; |
726f6388 JA |
898 | continue; |
899 | } | |
900 | ||
cce855bc | 901 | if (string[i] == '$' && string[i+1] == LBRACE) |
726f6388 | 902 | { |
ccc6cda3 JA |
903 | nesting_level++; |
904 | i++; | |
726f6388 JA |
905 | continue; |
906 | } | |
907 | ||
cce855bc | 908 | if (c == RBRACE) |
726f6388 | 909 | { |
ccc6cda3 JA |
910 | nesting_level--; |
911 | if (nesting_level == 0) | |
912 | break; | |
726f6388 JA |
913 | continue; |
914 | } | |
915 | ||
ccc6cda3 JA |
916 | /* Pass the contents of old-style command substitutions through |
917 | verbatim. */ | |
918 | if (c == '`') | |
726f6388 | 919 | { |
ccc6cda3 JA |
920 | si = i + 1; |
921 | t = string_extract (string, &si, "`", 0); | |
922 | i = si; | |
923 | free (t); | |
924 | continue; | |
925 | } | |
726f6388 | 926 | |
cce855bc JA |
927 | /* Pass the contents of new-style command substitutions and |
928 | arithmetic substitutions through verbatim. */ | |
929 | if (string[i] == '$' && string[i+1] == LPAREN) | |
ccc6cda3 | 930 | { |
726f6388 | 931 | si = i + 2; |
cce855bc | 932 | t = extract_delimited_string (string, &si, "$(", "(", ")"); /*)*/ |
726f6388 | 933 | i = si; |
ccc6cda3 | 934 | free (t); |
726f6388 JA |
935 | continue; |
936 | } | |
937 | ||
cce855bc JA |
938 | /* Pass the contents of single-quoted and double-quoted strings |
939 | through verbatim. */ | |
940 | if (c == '\'' || c == '"') | |
ccc6cda3 JA |
941 | { |
942 | si = i + 1; | |
cce855bc JA |
943 | i = (c == '\'') ? skip_single_quoted (string, si) |
944 | : skip_double_quoted (string, si); | |
945 | /* skip_XXX_quoted leaves index one past close quote */ | |
ccc6cda3 JA |
946 | i--; |
947 | continue; | |
948 | } | |
cce855bc | 949 | } |
726f6388 | 950 | |
b72432fd | 951 | if (c == 0 && nesting_level && doing_completion == 0) |
cce855bc JA |
952 | { |
953 | report_error ("bad substitution: no ending `}' in %s", string); | |
954 | jump_to_top_level (DISCARD); | |
726f6388 | 955 | } |
726f6388 | 956 | |
bb70624e | 957 | result = substring (string, *sindex, i); |
726f6388 JA |
958 | *sindex = i; |
959 | ||
ccc6cda3 | 960 | return (result); |
726f6388 JA |
961 | } |
962 | ||
ccc6cda3 JA |
963 | /* Remove backslashes which are quoting backquotes from STRING. Modifies |
964 | STRING, and returns a pointer to it. */ | |
965 | char * | |
966 | de_backslash (string) | |
726f6388 | 967 | char *string; |
ccc6cda3 JA |
968 | { |
969 | register int i, l; | |
726f6388 | 970 | |
ccc6cda3 JA |
971 | for (i = 0, l = strlen (string); i < l; i++) |
972 | if (string[i] == '\\' && (string[i + 1] == '`' || string[i + 1] == '\\' || | |
973 | string[i + 1] == '$')) | |
974 | strcpy (string + i, string + i + 1); /* XXX - should be memmove */ | |
975 | return (string); | |
976 | } | |
726f6388 | 977 | |
ccc6cda3 | 978 | #if 0 |
cce855bc | 979 | /*UNUSED*/ |
ccc6cda3 JA |
980 | /* Replace instances of \! in a string with !. */ |
981 | void | |
982 | unquote_bang (string) | |
983 | char *string; | |
984 | { | |
985 | register int i, j; | |
986 | register char *temp; | |
726f6388 | 987 | |
ccc6cda3 | 988 | temp = xmalloc (1 + strlen (string)); |
726f6388 | 989 | |
ccc6cda3 JA |
990 | for (i = 0, j = 0; (temp[j] = string[i]); i++, j++) |
991 | { | |
992 | if (string[i] == '\\' && string[i + 1] == '!') | |
993 | { | |
994 | temp[j] = '!'; | |
995 | i++; | |
996 | } | |
997 | } | |
998 | strcpy (string, temp); | |
999 | free (temp); | |
726f6388 | 1000 | } |
ccc6cda3 | 1001 | #endif |
726f6388 | 1002 | |
ccc6cda3 | 1003 | #if defined (READLINE) |
726f6388 JA |
1004 | /* Return 1 if the portion of STRING ending at EINDEX is quoted (there is |
1005 | an unclosed quoted string), or if the character at EINDEX is quoted | |
b72432fd JA |
1006 | by a backslash. DOING_COMPLETION is used to flag that the various |
1007 | single and double-quoted string parsing functions should not return an | |
1008 | error if there are unclosed quotes or braces. */ | |
1009 | ||
1010 | #define CQ_RETURN(x) do { doing_completion = 0; return (x); } while (0) | |
1011 | ||
726f6388 JA |
1012 | int |
1013 | char_is_quoted (string, eindex) | |
1014 | char *string; | |
1015 | int eindex; | |
1016 | { | |
1017 | int i, pass_next, quoted; | |
726f6388 | 1018 | |
b72432fd | 1019 | doing_completion = 1; |
726f6388 JA |
1020 | for (i = pass_next = quoted = 0; i <= eindex; i++) |
1021 | { | |
1022 | if (pass_next) | |
1023 | { | |
1024 | pass_next = 0; | |
1025 | if (i >= eindex) /* XXX was if (i >= eindex - 1) */ | |
b72432fd | 1026 | CQ_RETURN(1); |
726f6388 JA |
1027 | continue; |
1028 | } | |
ccc6cda3 JA |
1029 | else if (string[i] == '\'' || string[i] == '"') |
1030 | { | |
1031 | i = (string[i] == '\'') ? skip_single_quoted (string, ++i) | |
1032 | : skip_double_quoted (string, ++i); | |
1033 | if (i > eindex) | |
b72432fd | 1034 | CQ_RETURN(1); |
ccc6cda3 JA |
1035 | i--; /* the skip functions increment past the closing quote. */ |
1036 | } | |
726f6388 | 1037 | else if (string[i] == '\\') |
ccc6cda3 JA |
1038 | { |
1039 | pass_next = 1; | |
1040 | continue; | |
1041 | } | |
726f6388 | 1042 | } |
b72432fd | 1043 | CQ_RETURN(0); |
726f6388 JA |
1044 | } |
1045 | ||
726f6388 JA |
1046 | int |
1047 | unclosed_pair (string, eindex, openstr) | |
1048 | char *string; | |
1049 | int eindex; | |
1050 | char *openstr; | |
1051 | { | |
ccc6cda3 | 1052 | int i, pass_next, openc, olen; |
726f6388 JA |
1053 | |
1054 | olen = strlen (openstr); | |
1055 | for (i = pass_next = openc = 0; i <= eindex; i++) | |
1056 | { | |
1057 | if (pass_next) | |
1058 | { | |
1059 | pass_next = 0; | |
1060 | if (i >= eindex) /* XXX was if (i >= eindex - 1) */ | |
1061 | return 0; | |
1062 | continue; | |
1063 | } | |
1064 | else if (STREQN (string + i, openstr, olen)) | |
1065 | { | |
1066 | openc = 1 - openc; | |
1067 | i += olen - 1; | |
1068 | } | |
ccc6cda3 | 1069 | else if (string[i] == '\'' || string[i] == '"') |
726f6388 | 1070 | { |
ccc6cda3 JA |
1071 | i = (string[i] == '\'') ? skip_single_quoted (string, i) |
1072 | : skip_double_quoted (string, i); | |
726f6388 JA |
1073 | if (i > eindex) |
1074 | return 0; | |
1075 | } | |
1076 | else if (string[i] == '\\') | |
1077 | { | |
1078 | pass_next = 1; | |
1079 | continue; | |
1080 | } | |
1081 | } | |
1082 | return (openc); | |
1083 | } | |
bb70624e JA |
1084 | |
1085 | /* Skip characters in STRING until we find a character in DELIMS, and return | |
1086 | the index of that character. START is the index into string at which we | |
1087 | begin. This is similar in spirit to strpbrk, but it returns an index into | |
1088 | STRING and takes a starting index. This little piece of code knows quite | |
1089 | a lot of shell syntax. It's very similar to skip_double_quoted and other | |
1090 | functions of that ilk. */ | |
1091 | int | |
1092 | skip_to_delim (string, start, delims) | |
1093 | char *string; | |
1094 | int start; | |
1095 | char *delims; | |
1096 | { | |
1097 | int i, pass_next, backq, si; | |
1098 | char *temp; | |
1099 | ||
1100 | doing_completion = 1; | |
1101 | for (i = start, pass_next = backq = 0; string[i]; i++) | |
1102 | { | |
1103 | if (pass_next) | |
1104 | { | |
1105 | pass_next = 0; | |
1106 | if (string[i] == 0) | |
1107 | CQ_RETURN(i); | |
1108 | continue; | |
1109 | } | |
1110 | else if (string[i] == '\\') | |
1111 | { | |
1112 | pass_next = 1; | |
1113 | continue; | |
1114 | } | |
1115 | else if (backq) | |
1116 | { | |
1117 | if (string[i] == '`') | |
1118 | backq = 0; | |
1119 | continue; | |
1120 | } | |
1121 | else if (string[i] == '`') | |
1122 | { | |
1123 | backq = 1; | |
1124 | continue; | |
1125 | } | |
1126 | else if (string[i] == '\'' || string[i] == '"') | |
1127 | { | |
1128 | i = (string[i] == '\'') ? skip_single_quoted (string, ++i) | |
1129 | : skip_double_quoted (string, ++i); | |
1130 | i--; /* the skip functions increment past the closing quote. */ | |
1131 | } | |
1132 | else if (string[i] == '$' && (string[i+1] == LPAREN || string[i+1] == LBRACE)) | |
1133 | { | |
1134 | si = i + 2; | |
1135 | if (string[si] == '\0') | |
1136 | break; | |
1137 | if (string[i+1] == LPAREN) | |
1138 | temp = extract_delimited_string (string, &si, "$(", "(", ")"); /* ) */ | |
1139 | else | |
1140 | temp = extract_dollar_brace_string (string, &si, 0); | |
1141 | i = si; | |
1142 | free (temp); | |
1143 | continue; | |
1144 | } | |
1145 | else if (member (string[i], delims)) | |
1146 | break; | |
1147 | } | |
1148 | CQ_RETURN(i); | |
1149 | } | |
1150 | ||
1151 | /* Split STRING (length SLEN) at DELIMS, and return a WORD_LIST with the | |
1152 | individual words. If DELIMS is NULL, the current value of $IFS is used | |
1153 | to split the string. SENTINEL is an index to look for. NWP, if non-NULL | |
1154 | gets the number of words in the returned list. CWP, if non-NULL, gets | |
1155 | the index of the word containing SENTINEL. Non-whitespace chars in | |
1156 | DELIMS delimit separate fields. */ | |
1157 | WORD_LIST * | |
1158 | split_at_delims (string, slen, delims, sentinel, nwp, cwp) | |
1159 | char *string; | |
1160 | int slen; | |
1161 | char *delims; | |
1162 | int sentinel; | |
1163 | int *nwp, *cwp; | |
1164 | { | |
1165 | int ts, te, i, nw, cw, peekc; | |
1166 | char *token, *s, *d, *d2; | |
1167 | WORD_LIST *ret, *tl; | |
1168 | ||
1169 | if (string == 0 || *string == '\0') | |
1170 | { | |
1171 | if (nwp) | |
1172 | *nwp = 0; | |
1173 | if (cwp) | |
1174 | *cwp = 0; | |
1175 | return ((WORD_LIST *)NULL); | |
1176 | } | |
1177 | ||
1178 | d = (delims == 0) ? getifs () : delims; | |
1179 | ||
1180 | /* Make d2 the non-whitespace characters in delims */ | |
1181 | d2 = 0; | |
1182 | if (delims) | |
1183 | { | |
1184 | d2 = xmalloc (strlen (delims) + 1); | |
1185 | for (i = ts = 0; delims[i]; i++) | |
1186 | { | |
1187 | if (whitespace(delims[i]) == 0) | |
1188 | d2[ts++] = delims[i]; | |
1189 | } | |
1190 | d2[ts] = '\0'; | |
1191 | } | |
1192 | ||
1193 | ret = (WORD_LIST *)NULL; | |
1194 | ||
1195 | for (i = 0; member (string[i], d) && whitespace(string[i]); i++) | |
1196 | ; | |
1197 | if (string[i] == '\0') | |
1198 | return (ret); | |
1199 | ||
1200 | ts = i; | |
1201 | nw = 0; | |
1202 | cw = -1; | |
1203 | while (1) | |
1204 | { | |
1205 | te = skip_to_delim (string, ts, d); | |
1206 | ||
1207 | /* If we have a non-whitespace delimiter character, use it to make a | |
1208 | separate field. This is just about what $IFS splitting does and | |
1209 | is closer to the behavior of the shell parser. */ | |
1210 | if (ts == te && member(string[ts], d2)) | |
1211 | { | |
1212 | te = ts + 1; | |
1213 | while (member(string[te], d2)) | |
1214 | te++; | |
1215 | } | |
1216 | ||
1217 | token = substring (string, ts, te); | |
1218 | ||
1219 | ret = add_string_to_list (token, ret); | |
1220 | free (token); | |
1221 | nw++; | |
1222 | ||
1223 | if (sentinel >= ts && sentinel <= te) | |
1224 | cw = nw; | |
1225 | ||
1226 | /* If the cursor is at whitespace just before word start, set the | |
1227 | sentinel word to the current word. */ | |
1228 | if (cwp && cw == -1 && sentinel == ts-1) | |
1229 | cw = nw; | |
1230 | ||
1231 | /* If the cursor is at whitespace between two words, make a new, empty | |
1232 | word, add it before (well, after, since the list is in reverse order) | |
1233 | the word we just added, and set the current word to that one. */ | |
1234 | if (cwp && cw == -1 && sentinel < ts) | |
1235 | { | |
1236 | tl = (WORD_LIST *)xmalloc (sizeof (WORD_LIST)); | |
1237 | tl->word = make_word (""); | |
1238 | tl->next = ret->next; | |
1239 | ret->next = tl; | |
1240 | cw = nw; | |
1241 | nw++; | |
1242 | } | |
1243 | ||
1244 | if (string[te] == 0) | |
1245 | break; | |
1246 | ||
1247 | i = te + member(string[te], d); | |
1248 | while (member (string[i], d) && whitespace(string[i])) | |
1249 | i++; | |
1250 | ||
1251 | if (string[i]) | |
1252 | ts = i; | |
1253 | else | |
1254 | break; | |
1255 | } | |
1256 | ||
1257 | /* Special case for SENTINEL at the end of STRING. If we haven't found | |
1258 | the word containing SENTINEL yet, and the index we're looking for is at | |
1259 | the end of STRING, add an additional null argument and set the current | |
1260 | word pointer to that. */ | |
1261 | if (cwp && cw == -1 && sentinel >= slen) | |
1262 | { | |
1263 | if (whitespace (string[sentinel - 1])) | |
1264 | { | |
1265 | token = ""; | |
1266 | ret = add_string_to_list (token, ret); | |
1267 | nw++; | |
1268 | } | |
1269 | cw = nw; | |
1270 | } | |
1271 | ||
1272 | if (nwp) | |
1273 | *nwp = nw; | |
1274 | if (cwp) | |
1275 | *cwp = cw; | |
1276 | ||
1277 | return (REVERSE_LIST (ret, WORD_LIST *)); | |
1278 | } | |
726f6388 JA |
1279 | #endif /* READLINE */ |
1280 | ||
ccc6cda3 JA |
1281 | #if 0 |
1282 | /* UNUSED */ | |
726f6388 JA |
1283 | /* Extract the name of the variable to bind to from the assignment string. */ |
1284 | char * | |
1285 | assignment_name (string) | |
1286 | char *string; | |
1287 | { | |
ccc6cda3 | 1288 | int offset; |
726f6388 JA |
1289 | char *temp; |
1290 | ||
ccc6cda3 JA |
1291 | offset = assignment (string); |
1292 | if (offset == 0) | |
726f6388 | 1293 | return (char *)NULL; |
bb70624e | 1294 | temp = substring (string, 0, offset); |
726f6388 JA |
1295 | return (temp); |
1296 | } | |
ccc6cda3 | 1297 | #endif |
726f6388 | 1298 | |
cce855bc JA |
1299 | /* **************************************************************** */ |
1300 | /* */ | |
1301 | /* Functions to convert strings to WORD_LISTs and vice versa */ | |
1302 | /* */ | |
1303 | /* **************************************************************** */ | |
1304 | ||
726f6388 JA |
1305 | /* Return a single string of all the words in LIST. SEP is the separator |
1306 | to put between individual elements of LIST in the output string. */ | |
1307 | static char * | |
1308 | string_list_internal (list, sep) | |
1309 | WORD_LIST *list; | |
1310 | char *sep; | |
1311 | { | |
1312 | register WORD_LIST *t; | |
1313 | char *result, *r; | |
1314 | int word_len, sep_len, result_size; | |
1315 | ||
ccc6cda3 | 1316 | if (list == 0) |
726f6388 JA |
1317 | return ((char *)NULL); |
1318 | ||
1319 | /* This is nearly always called with either sep[0] == 0 or sep[1] == 0. */ | |
1320 | sep_len = STRLEN (sep); | |
1321 | result_size = 0; | |
1322 | ||
1323 | for (t = list; t; t = t->next) | |
1324 | { | |
1325 | if (t != list) | |
1326 | result_size += sep_len; | |
1327 | result_size += strlen (t->word->word); | |
1328 | } | |
1329 | ||
1330 | r = result = xmalloc (result_size + 1); | |
1331 | ||
1332 | for (t = list; t; t = t->next) | |
1333 | { | |
1334 | if (t != list && sep_len) | |
1335 | { | |
ccc6cda3 JA |
1336 | if (sep_len > 1) |
1337 | { | |
1338 | FASTCOPY (sep, r, sep_len); | |
1339 | r += sep_len; | |
1340 | } | |
1341 | else | |
1342 | *r++ = sep[0]; | |
726f6388 JA |
1343 | } |
1344 | ||
1345 | word_len = strlen (t->word->word); | |
1346 | FASTCOPY (t->word->word, r, word_len); | |
1347 | r += word_len; | |
1348 | } | |
1349 | ||
ccc6cda3 | 1350 | *r = '\0'; |
726f6388 JA |
1351 | return (result); |
1352 | } | |
1353 | ||
1354 | /* Return a single string of all the words present in LIST, separating | |
1355 | each word with a space. */ | |
1356 | char * | |
1357 | string_list (list) | |
1358 | WORD_LIST *list; | |
1359 | { | |
1360 | return (string_list_internal (list, " ")); | |
1361 | } | |
1362 | ||
1363 | /* Return a single string of all the words present in LIST, obeying the | |
1364 | quoting rules for "$*", to wit: (P1003.2, draft 11, 3.5.2) "If the | |
1365 | expansion [of $*] appears within a double quoted string, it expands | |
1366 | to a single field with the value of each parameter separated by the | |
1367 | first character of the IFS variable, or by a <space> if IFS is unset." */ | |
cce855bc | 1368 | static char * |
726f6388 JA |
1369 | string_list_dollar_star (list) |
1370 | WORD_LIST *list; | |
1371 | { | |
ccc6cda3 | 1372 | char *ifs, sep[2]; |
726f6388 | 1373 | |
ccc6cda3 | 1374 | ifs = get_string_value ("IFS"); |
726f6388 | 1375 | |
cce855bc | 1376 | sep[0] = (ifs == 0) ? ' ' : *ifs; |
726f6388 JA |
1377 | sep[1] = '\0'; |
1378 | ||
1379 | return (string_list_internal (list, sep)); | |
1380 | } | |
1381 | ||
cce855bc JA |
1382 | /* Turn $@ into a string. If (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) |
1383 | is non-zero, the $@ appears within double quotes, and we should quote | |
1384 | the list before converting it into a string. If IFS is unset, and the | |
1385 | word is not quoted, we just need to quote CTLESC and CTLNUL characters | |
1386 | in the words in the list, because the default value of $IFS is | |
1387 | <space><tab><newline>, IFS characters in the words in the list should | |
1388 | also be split. If IFS is null, and the word is not quoted, we need | |
1389 | to quote the words in the list to preserve the positional parameters | |
1390 | exactly. */ | |
1391 | static char * | |
1392 | string_list_dollar_at (list, quoted) | |
1393 | WORD_LIST *list; | |
1394 | int quoted; | |
1395 | { | |
1396 | char *ifs, sep[2]; | |
1397 | WORD_LIST *tlist; | |
1398 | ||
1399 | ifs = get_string_value ("IFS"); | |
1400 | ||
1401 | sep[0] = (ifs == 0 || *ifs == 0) ? ' ' : *ifs; | |
1402 | sep[1] = '\0'; | |
1403 | ||
1404 | tlist = ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || (ifs && *ifs == 0)) | |
1405 | ? quote_list (list) | |
1406 | : list_quote_escapes (list); | |
1407 | return (string_list_internal (tlist, sep)); | |
1408 | } | |
1409 | ||
726f6388 JA |
1410 | /* Return the list of words present in STRING. Separate the string into |
1411 | words at any of the characters found in SEPARATORS. If QUOTED is | |
1412 | non-zero then word in the list will have its quoted flag set, otherwise | |
1413 | the quoted flag is left as make_word () deemed fit. | |
1414 | ||
1415 | This obeys the P1003.2 word splitting semantics. If `separators' is | |
1416 | exactly <space><tab><newline>, then the splitting algorithm is that of | |
1417 | the Bourne shell, which treats any sequence of characters from `separators' | |
1418 | as a delimiter. If IFS is unset, which results in `separators' being set | |
1419 | to "", no splitting occurs. If separators has some other value, the | |
1420 | following rules are applied (`IFS white space' means zero or more | |
1421 | occurrences of <space>, <tab>, or <newline>, as long as those characters | |
1422 | are in `separators'): | |
1423 | ||
1424 | 1) IFS white space is ignored at the start and the end of the | |
1425 | string. | |
1426 | 2) Each occurrence of a character in `separators' that is not | |
1427 | IFS white space, along with any adjacent occurrences of | |
1428 | IFS white space delimits a field. | |
1429 | 3) Any nonzero-length sequence of IFS white space delimits a field. | |
1430 | */ | |
1431 | ||
1432 | /* BEWARE! list_string strips null arguments. Don't call it twice and | |
1433 | expect to have "" preserved! */ | |
1434 | ||
726f6388 JA |
1435 | /* This performs word splitting and quoted null character removal on |
1436 | STRING. */ | |
726f6388 JA |
1437 | #define issep(c) (member ((c), separators)) |
1438 | ||
1439 | WORD_LIST * | |
1440 | list_string (string, separators, quoted) | |
1441 | register char *string, *separators; | |
1442 | int quoted; | |
1443 | { | |
ccc6cda3 JA |
1444 | WORD_LIST *result; |
1445 | WORD_DESC *t; | |
1446 | char *current_word, *s; | |
1447 | int sindex, sh_style_split; | |
726f6388 JA |
1448 | |
1449 | if (!string || !*string) | |
1450 | return ((WORD_LIST *)NULL); | |
1451 | ||
1452 | sh_style_split = | |
1453 | separators && *separators && (STREQ (separators, " \t\n")); | |
1454 | ||
1455 | /* Remove sequences of whitespace at the beginning of STRING, as | |
1456 | long as those characters appear in IFS. Do not do this if | |
1457 | STRING is quoted or if there are no separator characters. */ | |
1458 | if (!quoted || !separators || !*separators) | |
1459 | { | |
1460 | for (s = string; *s && spctabnl (*s) && issep (*s); s++); | |
1461 | ||
1462 | if (!*s) | |
1463 | return ((WORD_LIST *)NULL); | |
1464 | ||
1465 | string = s; | |
1466 | } | |
1467 | ||
1468 | /* OK, now STRING points to a word that does not begin with white space. | |
1469 | The splitting algorithm is: | |
1470 | extract a word, stopping at a separator | |
1471 | skip sequences of spc, tab, or nl as long as they are separators | |
1472 | This obeys the field splitting rules in Posix.2. */ | |
ccc6cda3 | 1473 | for (result = (WORD_LIST *)NULL, sindex = 0; string[sindex]; ) |
726f6388 JA |
1474 | { |
1475 | current_word = string_extract_verbatim (string, &sindex, separators); | |
ccc6cda3 | 1476 | if (current_word == 0) |
726f6388 JA |
1477 | break; |
1478 | ||
1479 | /* If we have a quoted empty string, add a quoted null argument. We | |
1480 | want to preserve the quoted null character iff this is a quoted | |
1481 | empty string; otherwise the quoted null characters are removed | |
1482 | below. */ | |
1483 | if (QUOTED_NULL (current_word)) | |
1484 | { | |
ccc6cda3 JA |
1485 | t = make_bare_word (""); |
1486 | t->flags |= W_QUOTED; | |
726f6388 JA |
1487 | free (t->word); |
1488 | t->word = make_quoted_char ('\0'); | |
1489 | result = make_word_list (t, result); | |
1490 | } | |
ccc6cda3 | 1491 | else if (current_word[0] != '\0') |
726f6388 JA |
1492 | { |
1493 | /* If we have something, then add it regardless. However, | |
1494 | perform quoted null character removal on the current word. */ | |
1495 | remove_quoted_nulls (current_word); | |
cce855bc | 1496 | result = add_string_to_list (current_word, result); |
ccc6cda3 JA |
1497 | if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) |
1498 | result->word->flags |= W_QUOTED; | |
726f6388 JA |
1499 | } |
1500 | ||
1501 | /* If we're not doing sequences of separators in the traditional | |
1502 | Bourne shell style, then add a quoted null argument. */ | |
726f6388 JA |
1503 | else if (!sh_style_split && !spctabnl (string[sindex])) |
1504 | { | |
ccc6cda3 JA |
1505 | t = make_bare_word (""); |
1506 | t->flags |= W_QUOTED; | |
1507 | free (t->word); | |
1508 | t->word = make_quoted_char ('\0'); | |
1509 | result = make_word_list (t, result); | |
726f6388 JA |
1510 | } |
1511 | ||
1512 | free (current_word); | |
1513 | ||
1514 | /* Move past the current separator character. */ | |
1515 | if (string[sindex]) | |
1516 | sindex++; | |
1517 | ||
1518 | /* Now skip sequences of space, tab, or newline characters if they are | |
1519 | in the list of separators. */ | |
1520 | while (string[sindex] && spctabnl (string[sindex]) && issep (string[sindex])) | |
1521 | sindex++; | |
726f6388 JA |
1522 | } |
1523 | return (REVERSE_LIST (result, WORD_LIST *)); | |
1524 | } | |
1525 | ||
1526 | /* Parse a single word from STRING, using SEPARATORS to separate fields. | |
1527 | ENDPTR is set to the first character after the word. This is used by | |
1528 | the `read' builtin. | |
1529 | XXX - this function is very similar to list_string; they should be | |
1530 | combined - XXX */ | |
1531 | char * | |
1532 | get_word_from_string (stringp, separators, endptr) | |
1533 | char **stringp, *separators, **endptr; | |
1534 | { | |
1535 | register char *s; | |
1536 | char *current_word; | |
1537 | int sindex, sh_style_split; | |
1538 | ||
1539 | if (!stringp || !*stringp || !**stringp) | |
1540 | return ((char *)NULL); | |
ccc6cda3 | 1541 | |
726f6388 JA |
1542 | s = *stringp; |
1543 | ||
1544 | sh_style_split = | |
1545 | separators && *separators && (STREQ (separators, " \t\n")); | |
1546 | ||
1547 | /* Remove sequences of whitespace at the beginning of STRING, as | |
1548 | long as those characters appear in IFS. */ | |
1549 | if (sh_style_split || !separators || !*separators) | |
1550 | { | |
1551 | for (; *s && spctabnl (*s) && issep (*s); s++); | |
1552 | ||
1553 | /* If the string is nothing but whitespace, update it and return. */ | |
1554 | if (!*s) | |
1555 | { | |
1556 | *stringp = s; | |
1557 | if (endptr) | |
1558 | *endptr = s; | |
1559 | return ((char *)NULL); | |
1560 | } | |
1561 | } | |
1562 | ||
1563 | /* OK, S points to a word that does not begin with white space. | |
1564 | Now extract a word, stopping at a separator, save a pointer to | |
1565 | the first character after the word, then skip sequences of spc, | |
1566 | tab, or nl as long as they are separators. | |
ccc6cda3 | 1567 | |
726f6388 JA |
1568 | This obeys the field splitting rules in Posix.2. */ |
1569 | sindex = 0; | |
1570 | current_word = string_extract_verbatim (s, &sindex, separators); | |
1571 | ||
1572 | /* Set ENDPTR to the first character after the end of the word. */ | |
1573 | if (endptr) | |
1574 | *endptr = s + sindex; | |
1575 | ||
1576 | /* Move past the current separator character. */ | |
1577 | if (s[sindex]) | |
1578 | sindex++; | |
1579 | ||
1580 | /* Now skip sequences of space, tab, or newline characters if they are | |
1581 | in the list of separators. */ | |
1582 | while (s[sindex] && spctabnl (s[sindex]) && issep (s[sindex])) | |
1583 | sindex++; | |
1584 | ||
1585 | /* Update STRING to point to the next field. */ | |
1586 | *stringp = s + sindex; | |
1587 | return (current_word); | |
1588 | } | |
1589 | ||
1590 | /* Remove IFS white space at the end of STRING. Start at the end | |
1591 | of the string and walk backwards until the beginning of the string | |
1592 | or we find a character that's not IFS white space and not CTLESC. | |
1593 | Only let CTLESC escape a white space character if SAW_ESCAPE is | |
1594 | non-zero. */ | |
1595 | char * | |
1596 | strip_trailing_ifs_whitespace (string, separators, saw_escape) | |
1597 | char *string, *separators; | |
1598 | int saw_escape; | |
1599 | { | |
1600 | char *s; | |
ccc6cda3 | 1601 | |
726f6388 JA |
1602 | s = string + STRLEN (string) - 1; |
1603 | while (s > string && ((spctabnl (*s) && issep (*s)) || | |
1604 | (saw_escape && *s == CTLESC && spctabnl (s[1])))) | |
1605 | s--; | |
1606 | *++s = '\0'; | |
1607 | return string; | |
1608 | } | |
1609 | ||
bb70624e JA |
1610 | #if 0 |
1611 | /* UNUSED */ | |
1612 | /* Split STRING into words at whitespace. Obeys shell-style quoting with | |
1613 | backslashes, single and double quotes. */ | |
ccc6cda3 JA |
1614 | WORD_LIST * |
1615 | list_string_with_quotes (string) | |
1616 | char *string; | |
1617 | { | |
1618 | WORD_LIST *list; | |
1619 | char *token, *s; | |
1620 | int c, i, tokstart, len; | |
1621 | ||
1622 | for (s = string; s && *s && spctabnl (*s); s++) | |
1623 | ; | |
1624 | if (s == 0 || *s == 0) | |
1625 | return ((WORD_LIST *)NULL); | |
1626 | ||
1627 | tokstart = i = 0; | |
1628 | list = (WORD_LIST *)NULL; | |
1629 | while (1) | |
1630 | { | |
1631 | c = s[i]; | |
1632 | if (c == '\\') | |
1633 | { | |
1634 | i++; | |
1635 | if (s[i]) | |
1636 | i++; | |
1637 | } | |
1638 | else if (c == '\'') | |
1639 | i = skip_single_quoted (s, ++i); | |
1640 | else if (c == '"') | |
1641 | i = skip_double_quoted (s, ++i); | |
1642 | else if (c == 0 || spctabnl (c)) | |
1643 | { | |
1644 | /* We have found the end of a token. Make a word out of it and | |
1645 | add it to the word list. */ | |
bb70624e | 1646 | token = substring (s, tokstart, i); |
cce855bc | 1647 | list = add_string_to_list (token, list); |
ccc6cda3 JA |
1648 | free (token); |
1649 | while (spctabnl (s[i])) | |
1650 | i++; | |
1651 | if (s[i]) | |
1652 | tokstart = i; | |
1653 | else | |
1654 | break; | |
1655 | } | |
1656 | else | |
1657 | i++; /* normal character */ | |
1658 | } | |
1659 | return (REVERSE_LIST (list, WORD_LIST *)); | |
1660 | } | |
bb70624e | 1661 | #endif |
d166f048 | 1662 | |
cce855bc JA |
1663 | /********************************************************/ |
1664 | /* */ | |
1665 | /* Functions to perform assignment statements */ | |
1666 | /* */ | |
1667 | /********************************************************/ | |
d166f048 | 1668 | |
ccc6cda3 JA |
1669 | #if defined (ARRAY_VARS) |
1670 | SHELL_VAR * | |
1671 | do_array_element_assignment (name, value) | |
1672 | char *name, *value; | |
1673 | { | |
1674 | char *t; | |
1675 | int ind, ni; | |
1676 | SHELL_VAR *entry; | |
1677 | ||
1678 | t = strchr (name, '['); | |
1679 | if (t == 0) | |
1680 | return ((SHELL_VAR *)NULL); | |
1681 | ind = t - name; | |
1682 | ni = skipsubscript (name, ind); | |
1683 | if ((ALL_ELEMENT_SUB (t[1]) && t[2] == ']') || (ni <= ind + 1)) | |
1684 | { | |
1685 | report_error ("%s: bad array subscript", name); | |
1686 | return ((SHELL_VAR *)NULL); | |
1687 | } | |
1688 | *t++ = '\0'; | |
1689 | ind = array_expand_index (t, ni - ind); | |
1690 | if (ind < 0) | |
1691 | { | |
1692 | t[-1] = '['; /* restore original name */ | |
1693 | report_error ("%s: bad array subscript", name); | |
1694 | return ((SHELL_VAR *)NULL); | |
1695 | } | |
1696 | entry = bind_array_variable (name, ind, value); | |
1697 | t[-1] = '['; /* restore original name */ | |
1698 | return (entry); | |
1699 | } | |
1700 | #endif /* ARRAY_VARS */ | |
1701 | ||
726f6388 JA |
1702 | /* Given STRING, an assignment string, get the value of the right side |
1703 | of the `=', and bind it to the left side. If EXPAND is true, then | |
1704 | perform parameter expansion, command substitution, and arithmetic | |
1705 | expansion on the right-hand side. Perform tilde expansion in any | |
1706 | case. Do not perform word splitting on the result of expansion. */ | |
1707 | static int | |
1708 | do_assignment_internal (string, expand) | |
1709 | char *string; | |
1710 | int expand; | |
1711 | { | |
ccc6cda3 JA |
1712 | int offset; |
1713 | char *name, *value; | |
1714 | SHELL_VAR *entry; | |
1715 | #if defined (ARRAY_VARS) | |
1716 | char *t; | |
1717 | int ni, assign_list = 0; | |
1718 | #endif | |
1719 | ||
1720 | offset = assignment (string); | |
1721 | name = savestring (string); | |
1722 | value = (char *)NULL; | |
726f6388 JA |
1723 | |
1724 | if (name[offset] == '=') | |
1725 | { | |
1726 | char *temp; | |
1727 | ||
1728 | name[offset] = 0; | |
1729 | temp = name + offset + 1; | |
1730 | ||
ccc6cda3 | 1731 | #if defined (ARRAY_VARS) |
cce855bc | 1732 | if (expand && temp[0] == LPAREN && strchr (temp, RPAREN)) |
726f6388 | 1733 | { |
ccc6cda3 JA |
1734 | assign_list = ni = 1; |
1735 | value = extract_delimited_string (temp, &ni, "(", (char *)NULL, ")"); | |
1736 | } | |
1737 | else | |
1738 | #endif | |
1739 | ||
1740 | /* Perform tilde expansion. */ | |
1741 | if (expand && temp[0]) | |
1742 | { | |
1743 | temp = (strchr (temp, '~') && unquoted_member ('~', temp)) | |
1744 | ? bash_tilde_expand (temp) | |
1745 | : savestring (temp); | |
726f6388 JA |
1746 | |
1747 | value = maybe_expand_string (temp, 0, expand_string_unsplit); | |
1748 | free (temp); | |
1749 | } | |
1750 | else | |
1751 | value = savestring (temp); | |
1752 | } | |
1753 | ||
1754 | if (value == 0) | |
d166f048 JA |
1755 | { |
1756 | value = xmalloc (1); | |
1757 | value[0] = '\0'; | |
1758 | } | |
726f6388 | 1759 | |
726f6388 | 1760 | if (echo_command_at_execute) |
ccc6cda3 JA |
1761 | #if defined (ARRAY_VARS) |
1762 | if (assign_list) | |
1763 | fprintf (stderr, "%s%s=(%s)\n", indirection_level_string (), name, value); | |
1764 | else | |
1765 | #endif | |
726f6388 JA |
1766 | fprintf (stderr, "%s%s=%s\n", indirection_level_string (), name, value); |
1767 | ||
d166f048 | 1768 | #define ASSIGN_RETURN(r) do { FREE (value); free (name); return (r); } while (0) |
ccc6cda3 JA |
1769 | |
1770 | #if defined (ARRAY_VARS) | |
1771 | if (t = strchr (name, '[')) | |
1772 | { | |
1773 | if (assign_list) | |
1774 | { | |
1775 | report_error ("%s: cannot assign list to array member", name); | |
1776 | ASSIGN_RETURN (0); | |
1777 | } | |
1778 | entry = do_array_element_assignment (name, value); | |
1779 | if (entry == 0) | |
1780 | ASSIGN_RETURN (0); | |
1781 | } | |
1782 | else if (assign_list) | |
1783 | entry = assign_array_from_string (name, value); | |
1784 | else | |
1785 | #endif /* ARRAY_VARS */ | |
1786 | entry = bind_variable (name, value); | |
1787 | ||
726f6388 JA |
1788 | stupidly_hack_special_variables (name); |
1789 | ||
1790 | if (entry) | |
bb70624e | 1791 | VUNSETATTR (entry, att_invisible); |
726f6388 | 1792 | |
726f6388 | 1793 | /* Return 1 if the assignment seems to have been performed correctly. */ |
bb70624e | 1794 | ASSIGN_RETURN (entry ? (readonly_p (entry) == 0) : 0); |
726f6388 JA |
1795 | } |
1796 | ||
1797 | /* Perform the assignment statement in STRING, and expand the | |
1798 | right side by doing command and parameter expansion. */ | |
ccc6cda3 | 1799 | int |
726f6388 JA |
1800 | do_assignment (string) |
1801 | char *string; | |
1802 | { | |
1803 | return do_assignment_internal (string, 1); | |
1804 | } | |
1805 | ||
1806 | /* Given STRING, an assignment string, get the value of the right side | |
1807 | of the `=', and bind it to the left side. Do not do command and | |
1808 | parameter substitution on the right hand side. */ | |
ccc6cda3 | 1809 | int |
726f6388 JA |
1810 | do_assignment_no_expand (string) |
1811 | char *string; | |
1812 | { | |
1813 | return do_assignment_internal (string, 0); | |
1814 | } | |
1815 | ||
cce855bc JA |
1816 | /*************************************************** |
1817 | * * | |
1818 | * Functions to manage the positional parameters * | |
1819 | * * | |
1820 | ***************************************************/ | |
726f6388 JA |
1821 | |
1822 | /* Return the word list that corresponds to `$*'. */ | |
1823 | WORD_LIST * | |
1824 | list_rest_of_args () | |
1825 | { | |
ccc6cda3 | 1826 | register WORD_LIST *list, *args; |
726f6388 JA |
1827 | int i; |
1828 | ||
1829 | /* Break out of the loop as soon as one of the dollar variables is null. */ | |
ccc6cda3 JA |
1830 | for (i = 1, list = (WORD_LIST *)NULL; i < 10 && dollar_vars[i]; i++) |
1831 | list = make_word_list (make_bare_word (dollar_vars[i]), list); | |
1832 | ||
1833 | for (args = rest_of_args; args; args = args->next) | |
1834 | list = make_word_list (make_bare_word (args->word->word), list); | |
726f6388 | 1835 | |
726f6388 JA |
1836 | return (REVERSE_LIST (list, WORD_LIST *)); |
1837 | } | |
1838 | ||
ccc6cda3 JA |
1839 | int |
1840 | number_of_args () | |
1841 | { | |
1842 | register WORD_LIST *list; | |
1843 | int n; | |
1844 | ||
1845 | for (n = 0; n < 9 && dollar_vars[n+1]; n++) | |
1846 | ; | |
1847 | for (list = rest_of_args; list; list = list->next) | |
1848 | n++; | |
1849 | return n; | |
1850 | } | |
1851 | ||
cce855bc JA |
1852 | /* Return the value of a positional parameter. This handles values > 10. */ |
1853 | char * | |
1854 | get_dollar_var_value (ind) | |
1855 | int ind; | |
1856 | { | |
1857 | char *temp; | |
1858 | WORD_LIST *p; | |
1859 | ||
1860 | if (ind < 10) | |
1861 | temp = dollar_vars[ind] ? savestring (dollar_vars[ind]) : (char *)NULL; | |
1862 | else /* We want something like ${11} */ | |
1863 | { | |
1864 | ind -= 10; | |
1865 | for (p = rest_of_args; p && ind--; p = p->next) | |
1866 | ; | |
1867 | temp = p ? savestring (p->word->word) : (char *)NULL; | |
1868 | } | |
1869 | return (temp); | |
1870 | } | |
1871 | ||
726f6388 JA |
1872 | /* Make a single large string out of the dollar digit variables, |
1873 | and the rest_of_args. If DOLLAR_STAR is 1, then obey the special | |
1874 | case of "$*" with respect to IFS. */ | |
1875 | char * | |
1876 | string_rest_of_args (dollar_star) | |
1877 | int dollar_star; | |
1878 | { | |
ccc6cda3 | 1879 | register WORD_LIST *list; |
726f6388 JA |
1880 | char *string; |
1881 | ||
ccc6cda3 | 1882 | list = list_rest_of_args (); |
726f6388 JA |
1883 | string = dollar_star ? string_list_dollar_star (list) : string_list (list); |
1884 | dispose_words (list); | |
1885 | return (string); | |
1886 | } | |
1887 | ||
cce855bc JA |
1888 | /* Return a string containing the positional parameters from START to |
1889 | END, inclusive. If STRING[0] == '*', we obey the rules for $*, | |
1890 | which only makes a difference if QUOTED is non-zero. */ | |
1891 | static char * | |
1892 | pos_params (string, start, end, quoted) | |
1893 | char *string; | |
1894 | int start, end, quoted; | |
726f6388 | 1895 | { |
cce855bc JA |
1896 | WORD_LIST *save, *params, *h, *t; |
1897 | char *ret; | |
1898 | int i; | |
726f6388 | 1899 | |
bb70624e JA |
1900 | /* see if we can short-circuit. if start == end, we want 0 parameters. */ |
1901 | if (start == end) | |
1902 | return ((char *)NULL); | |
1903 | ||
cce855bc JA |
1904 | save = params = list_rest_of_args (); |
1905 | if (save == 0) | |
1906 | return ((char *)NULL); | |
1907 | ||
1908 | for (i = 1; params && i < start; i++) | |
1909 | params = params->next; | |
1910 | if (params == 0) | |
1911 | return ((char *)NULL); | |
1912 | for (h = t = params; params && i < end; i++) | |
d166f048 | 1913 | { |
cce855bc JA |
1914 | t = params; |
1915 | params = params->next; | |
d166f048 | 1916 | } |
726f6388 | 1917 | |
cce855bc JA |
1918 | t->next = (WORD_LIST *)NULL; |
1919 | if (string[0] == '*') | |
1920 | ret = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? string_list_dollar_star (h) : string_list (h); | |
1921 | else | |
1922 | ret = string_list ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? quote_list (h) : h); | |
bb70624e JA |
1923 | if (t != params) |
1924 | t->next = params; | |
726f6388 | 1925 | |
cce855bc JA |
1926 | dispose_words (save); |
1927 | return (ret); | |
1928 | } | |
1929 | ||
1930 | /******************************************************************/ | |
1931 | /* */ | |
1932 | /* Functions to expand strings to strings or WORD_LISTs */ | |
1933 | /* */ | |
1934 | /******************************************************************/ | |
1935 | ||
1936 | #if defined (PROCESS_SUBSTITUTION) | |
1937 | #define EXP_CHAR(s) (s == '$' || s == '`' || s == '<' || s == '>' || s == CTLESC) | |
1938 | #else | |
1939 | #define EXP_CHAR(s) (s == '$' || s == '`' || s == CTLESC) | |
1940 | #endif | |
1941 | ||
1942 | /* If there are any characters in STRING that require full expansion, | |
1943 | then call FUNC to expand STRING; otherwise just perform quote | |
1944 | removal if necessary. This returns a new string. */ | |
1945 | static char * | |
1946 | maybe_expand_string (string, quoted, func) | |
1947 | char *string; | |
1948 | int quoted; | |
1949 | WORD_LIST *(*func)(); | |
1950 | { | |
1951 | WORD_LIST *list; | |
1952 | int i, saw_quote; | |
1953 | char *ret; | |
1954 | ||
1955 | for (i = saw_quote = 0; string[i]; i++) | |
1956 | { | |
1957 | if (EXP_CHAR (string[i])) | |
1958 | break; | |
1959 | else if (string[i] == '\'' || string[i] == '\\' || string[i] == '"') | |
1960 | saw_quote = 1; | |
1961 | } | |
1962 | ||
1963 | if (string[i]) | |
1964 | { | |
1965 | list = (*func) (string, quoted); | |
1966 | if (list) | |
1967 | { | |
1968 | ret = string_list (list); | |
1969 | dispose_words (list); | |
1970 | } | |
1971 | else | |
1972 | ret = (char *)NULL; | |
1973 | } | |
1974 | else if (saw_quote && ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) == 0)) | |
1975 | ret = string_quote_removal (string, quoted); | |
1976 | else | |
1977 | ret = savestring (string); | |
1978 | return ret; | |
1979 | } | |
1980 | ||
1981 | static inline char * | |
1982 | expand_string_to_string (string, quoted, func) | |
1983 | char *string; | |
1984 | int quoted; | |
1985 | WORD_LIST *(*func)(); | |
1986 | { | |
1987 | WORD_LIST *list; | |
1988 | char *ret; | |
1989 | ||
1990 | if (string == 0 || *string == '\0') | |
1991 | return ((char *)NULL); | |
1992 | ||
1993 | list = (*func) (string, quoted); | |
1994 | if (list) | |
1995 | { | |
1996 | ret = string_list (list); | |
1997 | dispose_words (list); | |
1998 | } | |
1999 | else | |
2000 | ret = (char *)NULL; | |
2001 | ||
2002 | return (ret); | |
2003 | } | |
2004 | ||
2005 | #if defined (COND_COMMAND) | |
2006 | /* Just remove backslashes in STRING. Returns a new string. */ | |
2007 | char * | |
2008 | remove_backslashes (string) | |
2009 | char *string; | |
2010 | { | |
2011 | char *r, *ret, *s; | |
2012 | ||
2013 | r = ret = xmalloc (strlen (string) + 1); | |
2014 | for (s = string; s && *s; ) | |
2015 | { | |
2016 | if (*s == '\\') | |
2017 | s++; | |
2018 | if (*s == 0) | |
2019 | break; | |
2020 | *r++ = *s++; | |
2021 | } | |
2022 | *r = '\0'; | |
2023 | return ret; | |
2024 | } | |
2025 | ||
2026 | /* This needs better error handling. */ | |
2027 | /* Expand W for use as an argument to a unary or binary operator in a | |
2028 | [[...]] expression. If SPECIAL is nonzero, this is the rhs argument | |
2029 | to the != or == operator, and should be treated as a pattern. In | |
2030 | this case, we quote the string specially for the globbing code. The | |
2031 | caller is responsible for removing the backslashes if the unquoted | |
2032 | words is needed later. */ | |
2033 | char * | |
2034 | cond_expand_word (w, special) | |
2035 | WORD_DESC *w; | |
2036 | int special; | |
2037 | { | |
2038 | char *r, *p; | |
2039 | WORD_LIST *l; | |
2040 | ||
2041 | if (w->word == 0 || w->word[0] == '\0') | |
2042 | return ((char *)NULL); | |
2043 | ||
b72432fd | 2044 | l = call_expand_word_internal (w, 0, 0, (int *)0, (int *)0); |
cce855bc JA |
2045 | if (l) |
2046 | { | |
2047 | if (special == 0) | |
2048 | { | |
2049 | dequote_list (l); | |
2050 | r = string_list (l); | |
2051 | } | |
2052 | else | |
2053 | { | |
2054 | p = string_list (l); | |
2055 | r = quote_string_for_globbing (p, QGLOB_CVTNULL); | |
2056 | free (p); | |
2057 | } | |
2058 | dispose_words (l); | |
2059 | } | |
2060 | else | |
2061 | r = (char *)NULL; | |
2062 | ||
2063 | return r; | |
2064 | } | |
2065 | #endif | |
2066 | ||
2067 | /* Call expand_word_internal to expand W and handle error returns. | |
2068 | A convenience function for functions that don't want to handle | |
2069 | any errors or free any memory before aborting. */ | |
2070 | static WORD_LIST * | |
b72432fd | 2071 | call_expand_word_internal (w, q, i, c, e) |
cce855bc | 2072 | WORD_DESC *w; |
b72432fd | 2073 | int q, i, *c, *e; |
cce855bc JA |
2074 | { |
2075 | WORD_LIST *result; | |
2076 | ||
b72432fd | 2077 | result = expand_word_internal (w, q, i, c, e); |
bb70624e | 2078 | if (result == &expand_word_error || result == &expand_word_fatal) |
cce855bc JA |
2079 | { |
2080 | /* By convention, each time this error is returned, w->word has | |
bb70624e JA |
2081 | already been freed (it sometimes may not be in the fatal case, |
2082 | but that doesn't result in a memory leak because we're going | |
2083 | to exit in most cases). */ | |
cce855bc | 2084 | w->word = (char *)NULL; |
bb70624e | 2085 | jump_to_top_level ((result == &expand_word_error) ? DISCARD : FORCE_EOF); |
cce855bc JA |
2086 | /* NOTREACHED */ |
2087 | } | |
cce855bc JA |
2088 | else |
2089 | return (result); | |
2090 | } | |
2091 | ||
2092 | /* Perform parameter expansion, command substitution, and arithmetic | |
2093 | expansion on STRING, as if it were a word. Leave the result quoted. */ | |
2094 | static WORD_LIST * | |
2095 | expand_string_internal (string, quoted) | |
2096 | char *string; | |
2097 | int quoted; | |
2098 | { | |
2099 | WORD_DESC td; | |
2100 | WORD_LIST *tresult; | |
2101 | ||
2102 | if (string == 0 || *string == 0) | |
2103 | return ((WORD_LIST *)NULL); | |
2104 | ||
2105 | bzero ((char *)&td, sizeof (td)); | |
2106 | td.word = string; | |
b72432fd | 2107 | tresult = call_expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL); |
cce855bc | 2108 | return (tresult); |
726f6388 JA |
2109 | } |
2110 | ||
2111 | /* Expand STRING by performing parameter expansion, command substitution, | |
2112 | and arithmetic expansion. Dequote the resulting WORD_LIST before | |
2113 | returning it, but do not perform word splitting. The call to | |
2114 | remove_quoted_nulls () is in here because word splitting normally | |
2115 | takes care of quote removal. */ | |
2116 | WORD_LIST * | |
2117 | expand_string_unsplit (string, quoted) | |
2118 | char *string; | |
2119 | int quoted; | |
2120 | { | |
2121 | WORD_LIST *value; | |
2122 | ||
2123 | if (!string || !*string) | |
2124 | return ((WORD_LIST *)NULL); | |
2125 | ||
2126 | value = expand_string_internal (string, quoted); | |
2127 | if (value) | |
2128 | { | |
2129 | if (value->word) | |
2130 | remove_quoted_nulls (value->word->word); | |
2131 | dequote_list (value); | |
2132 | } | |
2133 | return (value); | |
2134 | } | |
2135 | ||
bb70624e JA |
2136 | |
2137 | /* Expand one of the PS? prompt strings. This is a sort of combination of | |
2138 | expand_string_unsplit and expand_string_internal, but returns the | |
2139 | passed string when an error occurs. Might want to trap other calls | |
2140 | to jump_to_top_level here so we don't endlessly loop. */ | |
2141 | WORD_LIST * | |
2142 | expand_prompt_string (string, quoted) | |
2143 | char *string; | |
2144 | int quoted; | |
2145 | { | |
2146 | WORD_LIST *value; | |
2147 | WORD_DESC td; | |
2148 | ||
2149 | if (string == 0 || *string == 0) | |
2150 | return ((WORD_LIST *)NULL); | |
2151 | ||
2152 | bzero ((char *)&td, sizeof (td)); | |
2153 | td.word = savestring (string); | |
2154 | doing_prompt_expansion = 1; | |
2155 | value = expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL); | |
2156 | doing_prompt_expansion = 0; | |
2157 | if (value == &expand_word_error || value == &expand_word_fatal) | |
2158 | { | |
2159 | value = make_word_list (make_bare_word (string), (WORD_LIST *)NULL); | |
2160 | return value; | |
2161 | } | |
2162 | FREE (td.word); | |
2163 | if (value) | |
2164 | { | |
2165 | if (value->word) | |
2166 | remove_quoted_nulls (value->word->word); | |
2167 | dequote_list (value); | |
2168 | } | |
2169 | return (value); | |
2170 | } | |
2171 | ||
726f6388 JA |
2172 | /* Expand STRING just as if you were expanding a word, but do not dequote |
2173 | the resultant WORD_LIST. This is called only from within this file, | |
2174 | and is used to correctly preserve quoted characters when expanding | |
2175 | things like ${1+"$@"}. This does parameter expansion, command | |
b72432fd | 2176 | substitution, arithmetic expansion, and word splitting. */ |
726f6388 JA |
2177 | static WORD_LIST * |
2178 | expand_string_leave_quoted (string, quoted) | |
2179 | char *string; | |
2180 | int quoted; | |
2181 | { | |
2182 | WORD_LIST *tlist; | |
2183 | WORD_LIST *tresult; | |
2184 | ||
ccc6cda3 | 2185 | if (string == 0 || *string == '\0') |
726f6388 JA |
2186 | return ((WORD_LIST *)NULL); |
2187 | ||
2188 | tlist = expand_string_internal (string, quoted); | |
2189 | ||
2190 | if (tlist) | |
2191 | { | |
2192 | tresult = word_list_split (tlist); | |
2193 | dispose_words (tlist); | |
2194 | return (tresult); | |
2195 | } | |
2196 | return ((WORD_LIST *)NULL); | |
2197 | } | |
2198 | ||
ccc6cda3 JA |
2199 | /* This does not perform word splitting or dequote the WORD_LIST |
2200 | it returns. */ | |
2201 | static WORD_LIST * | |
2202 | expand_string_for_rhs (string, quoted, dollar_at_p, has_dollar_at) | |
2203 | char *string; | |
2204 | int quoted, *dollar_at_p, *has_dollar_at; | |
2205 | { | |
2206 | WORD_DESC td; | |
2207 | WORD_LIST *tresult; | |
2208 | ||
2209 | if (string == 0 || *string == '\0') | |
2210 | return (WORD_LIST *)NULL; | |
2211 | ||
d166f048 | 2212 | bzero ((char *)&td, sizeof (td)); |
ccc6cda3 | 2213 | td.word = string; |
b72432fd | 2214 | tresult = call_expand_word_internal (&td, quoted, 1, dollar_at_p, has_dollar_at); |
ccc6cda3 JA |
2215 | return (tresult); |
2216 | } | |
2217 | ||
726f6388 JA |
2218 | /* Expand STRING just as if you were expanding a word. This also returns |
2219 | a list of words. Note that filename globbing is *NOT* done for word | |
2220 | or string expansion, just when the shell is expanding a command. This | |
2221 | does parameter expansion, command substitution, arithmetic expansion, | |
2222 | and word splitting. Dequote the resultant WORD_LIST before returning. */ | |
2223 | WORD_LIST * | |
2224 | expand_string (string, quoted) | |
2225 | char *string; | |
2226 | int quoted; | |
2227 | { | |
2228 | WORD_LIST *result; | |
2229 | ||
2230 | if (!string || !*string) | |
2231 | return ((WORD_LIST *)NULL); | |
2232 | ||
2233 | result = expand_string_leave_quoted (string, quoted); | |
ccc6cda3 | 2234 | return (result ? dequote_list (result) : result); |
726f6388 JA |
2235 | } |
2236 | ||
2237 | /*************************************************** | |
2238 | * * | |
2239 | * Functions to handle quoting chars * | |
2240 | * * | |
2241 | ***************************************************/ | |
2242 | ||
cce855bc JA |
2243 | /* Conventions: |
2244 | ||
2245 | A string with s[0] == CTLNUL && s[1] == 0 is a quoted null string. | |
2246 | The parser passes CTLNUL as CTLESC CTLNUL. */ | |
2247 | ||
2248 | /* The parser passes us CTLESC as CTLESC CTLESC and CTLNUL as CTLESC CTLNUL. | |
2249 | This is necessary to make unquoted CTLESC and CTLNUL characters in the | |
2250 | data stream pass through properly. | |
2251 | Here we remove doubled CTLESC characters inside quoted strings before | |
2252 | quoting the entire string, so we do not double the number of CTLESC | |
2253 | characters. */ | |
2254 | static char * | |
2255 | remove_quoted_escapes (string) | |
2256 | char *string; | |
2257 | { | |
2258 | register char *s; | |
2259 | int docopy; | |
2260 | char *t, *t1; | |
2261 | ||
2262 | if (string == NULL) | |
2263 | return (string); | |
2264 | ||
2265 | t1 = t = xmalloc (strlen (string) + 1); | |
2266 | for (docopy = 0, s = string; *s; s++, t1++) | |
2267 | { | |
2268 | if (*s == CTLESC && (s[1] == CTLESC || s[1] == CTLNUL)) | |
2269 | { | |
2270 | s++; | |
2271 | docopy = 1; | |
2272 | } | |
2273 | *t1 = *s; | |
2274 | } | |
2275 | *t1 = '\0'; | |
2276 | if (docopy) | |
2277 | strcpy (string, t); | |
2278 | free (t); | |
2279 | return (string); | |
2280 | } | |
2281 | ||
2282 | /* Quote escape characters in string s, but no other characters. This is | |
2283 | used to protect CTLESC and CTLNUL in variable values from the rest of | |
2284 | the word expansion process after the variable is expanded. */ | |
2285 | static char * | |
2286 | quote_escapes (string) | |
2287 | char *string; | |
2288 | { | |
2289 | register char *s, *t; | |
2290 | char *result; | |
2291 | ||
2292 | result = xmalloc ((strlen (string) * 2) + 1); | |
2293 | for (s = string, t = result; *s; ) | |
2294 | { | |
2295 | if (*s == CTLESC || *s == CTLNUL) | |
2296 | *t++ = CTLESC; | |
2297 | *t++ = *s++; | |
2298 | } | |
2299 | *t = '\0'; | |
2300 | return (result); | |
2301 | } | |
2302 | ||
2303 | static WORD_LIST * | |
2304 | list_quote_escapes (list) | |
2305 | WORD_LIST *list; | |
2306 | { | |
2307 | register WORD_LIST *w; | |
2308 | char *t; | |
2309 | ||
2310 | for (w = list; w; w = w->next) | |
2311 | { | |
2312 | t = w->word->word; | |
2313 | w->word->word = quote_escapes (t); | |
2314 | free (t); | |
2315 | } | |
2316 | return list; | |
2317 | } | |
2318 | ||
bb70624e JA |
2319 | #if 0 |
2320 | /* UNUSED */ | |
cce855bc JA |
2321 | static char * |
2322 | dequote_escapes (string) | |
2323 | char *string; | |
2324 | { | |
2325 | register char *s, *t; | |
2326 | char *result; | |
2327 | ||
2328 | result = xmalloc (strlen (string) + 1); | |
2329 | for (s = string, t = result; *s; ) | |
2330 | { | |
2331 | if (*s == CTLESC && (s[1] == CTLESC || s[1] == CTLNUL)) | |
2332 | { | |
2333 | s++; | |
2334 | if (*s == '\0') | |
2335 | break; | |
2336 | } | |
2337 | *t++ = *s++; | |
2338 | } | |
2339 | *t = '\0'; | |
2340 | return result; | |
2341 | } | |
2342 | #endif | |
2343 | ||
ccc6cda3 | 2344 | static WORD_LIST * |
726f6388 | 2345 | dequote_list (list) |
ccc6cda3 | 2346 | WORD_LIST *list; |
726f6388 JA |
2347 | { |
2348 | register char *s; | |
ccc6cda3 | 2349 | register WORD_LIST *tlist; |
726f6388 | 2350 | |
ccc6cda3 | 2351 | for (tlist = list; tlist; tlist = tlist->next) |
726f6388 | 2352 | { |
ccc6cda3 JA |
2353 | s = dequote_string (tlist->word->word); |
2354 | free (tlist->word->word); | |
2355 | tlist->word->word = s; | |
726f6388 | 2356 | } |
ccc6cda3 | 2357 | return list; |
726f6388 JA |
2358 | } |
2359 | ||
bb70624e | 2360 | /* Return a new string with the quoted representation of character C. */ |
726f6388 JA |
2361 | static char * |
2362 | make_quoted_char (c) | |
2363 | int c; | |
2364 | { | |
2365 | char *temp; | |
2366 | ||
2367 | temp = xmalloc (3); | |
2368 | if (c == 0) | |
2369 | { | |
2370 | temp[0] = CTLNUL; | |
2371 | temp[1] = '\0'; | |
2372 | } | |
2373 | else | |
2374 | { | |
2375 | temp[0] = CTLESC; | |
2376 | temp[1] = c; | |
2377 | temp[2] = '\0'; | |
2378 | } | |
2379 | return (temp); | |
2380 | } | |
2381 | ||
2382 | /* Quote STRING. Return a new string. */ | |
ccc6cda3 | 2383 | char * |
726f6388 JA |
2384 | quote_string (string) |
2385 | char *string; | |
2386 | { | |
ccc6cda3 | 2387 | register char *t; |
726f6388 JA |
2388 | char *result; |
2389 | ||
ccc6cda3 | 2390 | if (*string == 0) |
726f6388 JA |
2391 | { |
2392 | result = xmalloc (2); | |
2393 | result[0] = CTLNUL; | |
2394 | result[1] = '\0'; | |
2395 | } | |
2396 | else | |
2397 | { | |
726f6388 JA |
2398 | result = xmalloc ((strlen (string) * 2) + 1); |
2399 | ||
ccc6cda3 | 2400 | for (t = result; *string; ) |
726f6388 JA |
2401 | { |
2402 | *t++ = CTLESC; | |
2403 | *t++ = *string++; | |
2404 | } | |
2405 | *t = '\0'; | |
2406 | } | |
2407 | return (result); | |
2408 | } | |
2409 | ||
2410 | /* De-quoted quoted characters in STRING. */ | |
2411 | char * | |
2412 | dequote_string (string) | |
2413 | char *string; | |
2414 | { | |
2415 | register char *t; | |
2416 | char *result; | |
2417 | ||
2418 | result = xmalloc (strlen (string) + 1); | |
2419 | ||
2420 | if (QUOTED_NULL (string)) | |
2421 | { | |
2422 | result[0] = '\0'; | |
2423 | return (result); | |
2424 | } | |
2425 | ||
2426 | /* If no character in the string can be quoted, don't bother examining | |
2427 | each character. Just return a copy of the string passed to us. */ | |
2428 | if (strchr (string, CTLESC) == NULL) /* XXX */ | |
2429 | { /* XXX */ | |
2430 | strcpy (result, string); /* XXX */ | |
2431 | return (result); /* XXX */ | |
2432 | } | |
2433 | ||
ccc6cda3 | 2434 | for (t = result; *string; string++, t++) |
726f6388 JA |
2435 | { |
2436 | if (*string == CTLESC) | |
2437 | { | |
2438 | string++; | |
2439 | ||
2440 | if (!*string) | |
2441 | break; | |
2442 | } | |
2443 | ||
ccc6cda3 | 2444 | *t = *string; |
726f6388 JA |
2445 | } |
2446 | ||
2447 | *t = '\0'; | |
2448 | return (result); | |
2449 | } | |
2450 | ||
2451 | /* Quote the entire WORD_LIST list. */ | |
ccc6cda3 | 2452 | static WORD_LIST * |
726f6388 JA |
2453 | quote_list (list) |
2454 | WORD_LIST *list; | |
2455 | { | |
2456 | register WORD_LIST *w; | |
ccc6cda3 | 2457 | char *t; |
726f6388 JA |
2458 | |
2459 | for (w = list; w; w = w->next) | |
2460 | { | |
ccc6cda3 | 2461 | t = w->word->word; |
726f6388 JA |
2462 | w->word->word = quote_string (t); |
2463 | free (t); | |
ccc6cda3 | 2464 | w->word->flags |= W_QUOTED; |
726f6388 | 2465 | } |
ccc6cda3 | 2466 | return list; |
726f6388 JA |
2467 | } |
2468 | ||
cce855bc JA |
2469 | /* Perform quoted null character removal on STRING. We don't allow any |
2470 | quoted null characters in the middle or at the ends of strings because | |
2471 | of how expand_word_internal works. remove_quoted_nulls () turns | |
2472 | STRING into an empty string iff it only consists of a quoted null, | |
2473 | and removes all unquoted CTLNUL characters. */ | |
2474 | /* | |
2475 | #define remove_quoted_nulls(string) \ | |
2476 | do { if (QUOTED_NULL (string)) string[0] ='\0'; } while (0) | |
2477 | */ | |
2478 | static void | |
2479 | remove_quoted_nulls (string) | |
2480 | char *string; | |
2481 | { | |
2482 | char *nstr, *s, *p; | |
2483 | ||
2484 | nstr = savestring (string); | |
2485 | nstr[0] = '\0'; | |
2486 | for (p = nstr, s = string; *s; s++) | |
2487 | { | |
2488 | if (*s == CTLESC) | |
2489 | { | |
2490 | *p++ = *s++; /* CTLESC */ | |
2491 | if (*s == 0) | |
2492 | break; | |
2493 | *p++ = *s; /* quoted char */ | |
2494 | continue; | |
2495 | } | |
2496 | if (*s == CTLNUL) | |
2497 | continue; | |
2498 | *p++ = *s; | |
2499 | } | |
2500 | *p = '\0'; | |
2501 | strcpy (string, nstr); | |
2502 | free (nstr); | |
2503 | } | |
2504 | ||
2505 | /* Perform quoted null character removal on each element of LIST. | |
2506 | This modifies LIST. */ | |
2507 | void | |
2508 | word_list_remove_quoted_nulls (list) | |
2509 | WORD_LIST *list; | |
2510 | { | |
2511 | register WORD_LIST *t; | |
2512 | ||
2513 | for (t = list; t; t = t->next) | |
2514 | remove_quoted_nulls (t->word->word); | |
2515 | } | |
2516 | ||
2517 | /* **************************************************************** */ | |
2518 | /* */ | |
2519 | /* Functions for Matching and Removing Patterns */ | |
2520 | /* */ | |
2521 | /* **************************************************************** */ | |
2522 | ||
2523 | /* Remove the portion of PARAM matched by PATTERN according to OP, where OP | |
2524 | can have one of 4 values: | |
2525 | RP_LONG_LEFT remove longest matching portion at start of PARAM | |
726f6388 JA |
2526 | RP_SHORT_LEFT remove shortest matching portion at start of PARAM |
2527 | RP_LONG_RIGHT remove longest matching portion at end of PARAM | |
2528 | RP_SHORT_RIGHT remove shortest matching portion at end of PARAM | |
2529 | */ | |
2530 | ||
2531 | #define RP_LONG_LEFT 1 | |
2532 | #define RP_SHORT_LEFT 2 | |
2533 | #define RP_LONG_RIGHT 3 | |
2534 | #define RP_SHORT_RIGHT 4 | |
2535 | ||
2536 | static char * | |
2537 | remove_pattern (param, pattern, op) | |
2538 | char *param, *pattern; | |
2539 | int op; | |
2540 | { | |
ccc6cda3 JA |
2541 | register int len; |
2542 | register char *end; | |
726f6388 JA |
2543 | register char *p, *ret, c; |
2544 | ||
ccc6cda3 JA |
2545 | if (param == NULL || *param == '\0') |
2546 | return (param); | |
726f6388 JA |
2547 | if (pattern == NULL || *pattern == '\0') /* minor optimization */ |
2548 | return (savestring (param)); | |
2549 | ||
ccc6cda3 JA |
2550 | len = STRLEN (param); |
2551 | end = param + len; | |
726f6388 JA |
2552 | |
2553 | switch (op) | |
2554 | { | |
2555 | case RP_LONG_LEFT: /* remove longest match at start */ | |
2556 | for (p = end; p >= param; p--) | |
2557 | { | |
2558 | c = *p; *p = '\0'; | |
cce855bc | 2559 | if (fnmatch (pattern, param, FNMATCH_EXTFLAG) != FNM_NOMATCH) |
726f6388 JA |
2560 | { |
2561 | *p = c; | |
2562 | return (savestring (p)); | |
2563 | } | |
2564 | *p = c; | |
2565 | } | |
2566 | break; | |
2567 | ||
2568 | case RP_SHORT_LEFT: /* remove shortest match at start */ | |
2569 | for (p = param; p <= end; p++) | |
2570 | { | |
2571 | c = *p; *p = '\0'; | |
cce855bc | 2572 | if (fnmatch (pattern, param, FNMATCH_EXTFLAG) != FNM_NOMATCH) |
726f6388 JA |
2573 | { |
2574 | *p = c; | |
2575 | return (savestring (p)); | |
2576 | } | |
2577 | *p = c; | |
2578 | } | |
2579 | break; | |
2580 | ||
ccc6cda3 JA |
2581 | case RP_LONG_RIGHT: /* remove longest match at end */ |
2582 | for (p = param; p <= end; p++) | |
2583 | { | |
cce855bc | 2584 | if (fnmatch (pattern, p, FNMATCH_EXTFLAG) != FNM_NOMATCH) |
ccc6cda3 JA |
2585 | { |
2586 | c = *p; *p = '\0'; | |
2587 | ret = savestring (param); | |
2588 | *p = c; | |
2589 | return (ret); | |
2590 | } | |
2591 | } | |
2592 | break; | |
2593 | ||
2594 | case RP_SHORT_RIGHT: /* remove shortest match at end */ | |
2595 | for (p = end; p >= param; p--) | |
2596 | { | |
cce855bc | 2597 | if (fnmatch (pattern, p, FNMATCH_EXTFLAG) != FNM_NOMATCH) |
ccc6cda3 JA |
2598 | { |
2599 | c = *p; *p = '\0'; | |
2600 | ret = savestring (param); | |
2601 | *p = c; | |
2602 | return (ret); | |
2603 | } | |
2604 | } | |
2605 | break; | |
2606 | } | |
2607 | return (savestring (param)); /* no match, return original string */ | |
2608 | } | |
2609 | ||
2610 | /* Return 1 of the first character of STRING could match the first | |
2611 | character of pattern PAT. Used to avoid n2 calls to fnmatch(). */ | |
2612 | static int | |
2613 | match_pattern_char (pat, string) | |
2614 | char *pat, *string; | |
2615 | { | |
d166f048 | 2616 | char c; |
ccc6cda3 JA |
2617 | |
2618 | if (*string == 0) | |
2619 | return (0); | |
2620 | ||
2621 | switch (c = *pat++) | |
2622 | { | |
2623 | default: | |
2624 | return (*string == c); | |
2625 | case '\\': | |
2626 | return (*string == *pat); | |
2627 | case '?': | |
cce855bc | 2628 | return (*string == LPAREN ? 1 : (*string != '\0')); |
ccc6cda3 JA |
2629 | case '*': |
2630 | return (1); | |
cce855bc JA |
2631 | case '+': |
2632 | case '!': | |
2633 | case '@': | |
2634 | return (*string == LPAREN ? 1 : (*string == c)); | |
ccc6cda3 | 2635 | case '[': |
d166f048 | 2636 | return (*string != '\0'); |
ccc6cda3 JA |
2637 | } |
2638 | } | |
2639 | ||
2640 | /* Match PAT anywhere in STRING and return the match boundaries. | |
2641 | This returns 1 in case of a successful match, 0 otherwise. SP | |
2642 | and EP are pointers into the string where the match begins and | |
2643 | ends, respectively. MTYPE controls what kind of match is attempted. | |
2644 | MATCH_BEG and MATCH_END anchor the match at the beginning and end | |
2645 | of the string, respectively. The longest match is returned. */ | |
2646 | static int | |
2647 | match_pattern (string, pat, mtype, sp, ep) | |
2648 | char *string, *pat; | |
2649 | int mtype; | |
2650 | char **sp, **ep; | |
2651 | { | |
2652 | int c; | |
2653 | register char *p, *p1; | |
2654 | char *end; | |
2655 | ||
2656 | if (string == 0 || *string == 0 || pat == 0 || *pat == 0) | |
2657 | return (0); | |
2658 | ||
2659 | end = string + STRLEN (string); | |
2660 | ||
2661 | switch (mtype) | |
2662 | { | |
2663 | case MATCH_ANY: | |
2664 | for (p = string; p <= end; p++) | |
2665 | { | |
2666 | if (match_pattern_char (pat, p)) | |
2667 | { | |
2668 | for (p1 = end; p1 >= p; p1--) | |
2669 | { | |
2670 | c = *p1; *p1 = '\0'; | |
cce855bc | 2671 | if (fnmatch (pat, p, FNMATCH_EXTFLAG) == 0) |
ccc6cda3 JA |
2672 | { |
2673 | *p1 = c; | |
2674 | *sp = p; | |
2675 | *ep = p1; | |
2676 | return 1; | |
2677 | } | |
2678 | *p1 = c; | |
2679 | } | |
2680 | } | |
2681 | } | |
2682 | return (0); | |
2683 | ||
2684 | case MATCH_BEG: | |
2685 | if (match_pattern_char (pat, string) == 0) | |
2686 | return (0); | |
2687 | for (p = end; p >= string; p--) | |
2688 | { | |
2689 | c = *p; *p = '\0'; | |
cce855bc | 2690 | if (fnmatch (pat, string, FNMATCH_EXTFLAG) == 0) |
ccc6cda3 JA |
2691 | { |
2692 | *p = c; | |
2693 | *sp = string; | |
2694 | *ep = p; | |
2695 | return 1; | |
2696 | } | |
2697 | *p = c; | |
2698 | } | |
2699 | return (0); | |
726f6388 | 2700 | |
ccc6cda3 JA |
2701 | case MATCH_END: |
2702 | for (p = string; p <= end; p++) | |
cce855bc | 2703 | if (fnmatch (pat, p, FNMATCH_EXTFLAG) == 0) |
726f6388 | 2704 | { |
ccc6cda3 JA |
2705 | *sp = p; |
2706 | *ep = end; | |
2707 | return 1; | |
726f6388 | 2708 | } |
ccc6cda3 | 2709 | return (0); |
726f6388 | 2710 | } |
ccc6cda3 JA |
2711 | |
2712 | return (0); | |
726f6388 JA |
2713 | } |
2714 | ||
cce855bc JA |
2715 | static int |
2716 | getpatspec (c, value) | |
2717 | int c; | |
2718 | char *value; | |
2719 | { | |
2720 | if (c == '#') | |
2721 | return ((*value == '#') ? RP_LONG_LEFT : RP_SHORT_LEFT); | |
2722 | else /* c == '%' */ | |
2723 | return ((*value == '%') ? RP_LONG_RIGHT : RP_SHORT_RIGHT); | |
2724 | } | |
2725 | ||
2726 | /* Posix.2 says that the WORD should be run through tilde expansion, | |
2727 | parameter expansion, command substitution and arithmetic expansion. | |
2728 | This leaves the result quoted, so quote_string_for_globbing () has | |
2729 | to be called to fix it up for fnmatch (). If QUOTED is non-zero, | |
2730 | it means that the entire expression was enclosed in double quotes. | |
2731 | This means that quoting characters in the pattern do not make any | |
2732 | special pattern characters quoted. For example, the `*' in the | |
2733 | following retains its special meaning: "${foo#'*'}". */ | |
2734 | static char * | |
2735 | getpattern (value, quoted, expandpat) | |
2736 | char *value; | |
2737 | int quoted, expandpat; | |
2738 | { | |
2739 | char *pat, *tword; | |
2740 | WORD_LIST *l; | |
2741 | int i; | |
2742 | ||
2743 | tword = strchr (value, '~') ? bash_tilde_expand (value) : savestring (value); | |
2744 | ||
2745 | /* expand_string_internal () leaves WORD quoted and does not perform | |
2746 | word splitting. */ | |
2747 | if (expandpat && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && *tword) | |
2748 | { | |
2749 | i = 0; | |
2750 | pat = string_extract_double_quoted (tword, &i, 1); | |
2751 | free (tword); | |
2752 | tword = pat; | |
2753 | } | |
2754 | ||
2755 | /* There is a problem here: how to handle single or double quotes in the | |
2756 | pattern string when the whole expression is between double quotes? */ | |
2757 | #if 0 | |
2758 | l = *tword ? expand_string_for_rhs (tword, quoted, (int *)NULL, (int *)NULL) | |
2759 | #else | |
2760 | l = *tword ? expand_string_for_rhs (tword, | |
2761 | (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? Q_NOQUOTE : quoted, | |
2762 | (int *)NULL, (int *)NULL) | |
2763 | #endif | |
2764 | : (WORD_LIST *)0; | |
2765 | free (tword); | |
2766 | pat = string_list (l); | |
2767 | dispose_words (l); | |
2768 | if (pat) | |
2769 | { | |
2770 | tword = quote_string_for_globbing (pat, QGLOB_CVTNULL); | |
2771 | free (pat); | |
2772 | pat = tword; | |
2773 | } | |
2774 | return (pat); | |
2775 | } | |
2776 | ||
2777 | /* Handle removing a pattern from a string as a result of ${name%[%]value} | |
2778 | or ${name#[#]value}. */ | |
2779 | static char * | |
2780 | parameter_brace_remove_pattern (value, temp, c, quoted) | |
2781 | char *value, *temp; | |
2782 | int c, quoted; | |
2783 | { | |
2784 | int patspec; | |
2785 | char *pattern, *tword; | |
2786 | ||
2787 | patspec = getpatspec (c, value); | |
2788 | if (patspec == RP_LONG_LEFT || patspec == RP_LONG_RIGHT) | |
2789 | value++; | |
2790 | ||
2791 | pattern = getpattern (value, quoted, 1); | |
2792 | ||
2793 | tword = remove_pattern (temp, pattern, patspec); | |
2794 | ||
2795 | FREE (pattern); | |
2796 | return (tword); | |
2797 | } | |
2798 | ||
2799 | static char * | |
2800 | list_remove_pattern (list, pattern, patspec, type, quoted) | |
2801 | WORD_LIST *list; | |
2802 | char *pattern; | |
2803 | int patspec, type, quoted; | |
2804 | { | |
2805 | WORD_LIST *new, *l; | |
2806 | WORD_DESC *w; | |
2807 | char *tword; | |
2808 | ||
2809 | for (new = (WORD_LIST *)NULL, l = list; l; l = l->next) | |
2810 | { | |
2811 | tword = remove_pattern (l->word->word, pattern, patspec); | |
2812 | w = make_bare_word (tword); | |
2813 | free (tword); | |
2814 | new = make_word_list (w, new); | |
2815 | } | |
2816 | ||
2817 | l = REVERSE_LIST (new, WORD_LIST *); | |
2818 | if (type == '*') | |
2819 | tword = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? string_list_dollar_star (l) : string_list (l); | |
2820 | else | |
2821 | tword = string_list ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? quote_list (l) : l); | |
2822 | ||
2823 | dispose_words (l); | |
2824 | return (tword); | |
2825 | } | |
2826 | ||
2827 | static char * | |
2828 | parameter_list_remove_pattern (value, type, c, quoted) | |
2829 | char *value; | |
2830 | int type, c, quoted; | |
2831 | { | |
2832 | int patspec; | |
2833 | char *pattern, *ret; | |
2834 | WORD_LIST *list; | |
2835 | ||
2836 | patspec = getpatspec (c, value); | |
2837 | if (patspec == RP_LONG_LEFT || patspec == RP_LONG_RIGHT) | |
2838 | value++; | |
2839 | ||
2840 | pattern = getpattern (value, quoted, 1); | |
2841 | ||
2842 | list = list_rest_of_args (); | |
2843 | ret = list_remove_pattern (list, pattern, patspec, type, quoted); | |
2844 | dispose_words (list); | |
2845 | FREE (pattern); | |
2846 | return (ret); | |
2847 | } | |
2848 | ||
2849 | #if defined (ARRAY_VARS) | |
2850 | static char * | |
2851 | array_remove_pattern (value, aspec, aval, c, quoted) | |
2852 | char *value, *aspec, *aval; /* AVAL == evaluated ASPEC */ | |
2853 | int c, quoted; | |
2854 | { | |
2855 | SHELL_VAR *var; | |
2856 | int len, patspec; | |
2857 | char *ret, *t, *pattern; | |
2858 | WORD_LIST *l; | |
2859 | ||
2860 | var = array_variable_part (aspec, &t, &len); | |
2861 | if (var == 0) | |
2862 | return ((char *)NULL); | |
2863 | ||
2864 | patspec = getpatspec (c, value); | |
2865 | if (patspec == RP_LONG_LEFT || patspec == RP_LONG_RIGHT) | |
2866 | value++; | |
2867 | ||
2868 | pattern = getpattern (value, quoted, 1); | |
2869 | ||
2870 | if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') | |
2871 | { | |
2872 | if (array_p (var) == 0) | |
2873 | { | |
2874 | report_error ("%s: bad array subscript", aspec); | |
2875 | FREE (pattern); | |
2876 | return ((char *)NULL); | |
2877 | } | |
2878 | l = array_to_word_list (array_cell (var)); | |
2879 | if (l == 0) | |
2880 | return ((char *)NULL); | |
2881 | ret = list_remove_pattern (l, pattern, patspec, t[0], quoted); | |
2882 | dispose_words (l); | |
2883 | } | |
2884 | else | |
2885 | { | |
2886 | ret = remove_pattern (aval, pattern, patspec); | |
2887 | if (ret) | |
2888 | { | |
2889 | t = quote_escapes (ret); | |
2890 | free (ret); | |
2891 | ret = t; | |
2892 | } | |
2893 | } | |
2894 | ||
2895 | FREE (pattern); | |
2896 | return ret; | |
2897 | } | |
2898 | #endif /* ARRAY_VARS */ | |
2899 | ||
726f6388 JA |
2900 | /******************************************* |
2901 | * * | |
2902 | * Functions to expand WORD_DESCs * | |
2903 | * * | |
2904 | *******************************************/ | |
2905 | ||
2906 | /* Expand WORD, performing word splitting on the result. This does | |
2907 | parameter expansion, command substitution, arithmetic expansion, | |
2908 | word splitting, and quote removal. */ | |
2909 | ||
2910 | WORD_LIST * | |
2911 | expand_word (word, quoted) | |
2912 | WORD_DESC *word; | |
2913 | int quoted; | |
2914 | { | |
2915 | WORD_LIST *result, *tresult; | |
2916 | ||
b72432fd | 2917 | tresult = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL); |
726f6388 JA |
2918 | result = word_list_split (tresult); |
2919 | dispose_words (tresult); | |
ccc6cda3 | 2920 | return (result ? dequote_list (result) : result); |
726f6388 JA |
2921 | } |
2922 | ||
2923 | /* Expand WORD, but do not perform word splitting on the result. This | |
2924 | does parameter expansion, command substitution, arithmetic expansion, | |
2925 | and quote removal. */ | |
2926 | WORD_LIST * | |
2927 | expand_word_no_split (word, quoted) | |
2928 | WORD_DESC *word; | |
2929 | int quoted; | |
2930 | { | |
2931 | WORD_LIST *result; | |
2932 | ||
b72432fd | 2933 | result = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL); |
ccc6cda3 | 2934 | return (result ? dequote_list (result) : result); |
726f6388 JA |
2935 | } |
2936 | ||
2937 | /* Perform shell expansions on WORD, but do not perform word splitting or | |
2938 | quote removal on the result. */ | |
2939 | WORD_LIST * | |
2940 | expand_word_leave_quoted (word, quoted) | |
2941 | WORD_DESC *word; | |
2942 | int quoted; | |
2943 | { | |
b72432fd | 2944 | return (call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL)); |
726f6388 JA |
2945 | } |
2946 | ||
726f6388 JA |
2947 | #if defined (PROCESS_SUBSTITUTION) |
2948 | ||
cce855bc JA |
2949 | /*****************************************************************/ |
2950 | /* */ | |
2951 | /* Hacking Process Substitution */ | |
2952 | /* */ | |
2953 | /*****************************************************************/ | |
726f6388 | 2954 | |
726f6388 JA |
2955 | #if !defined (HAVE_DEV_FD) |
2956 | /* Named pipes must be removed explicitly with `unlink'. This keeps a list | |
2957 | of FIFOs the shell has open. unlink_fifo_list will walk the list and | |
2958 | unlink all of them. add_fifo_list adds the name of an open FIFO to the | |
2959 | list. NFIFO is a count of the number of FIFOs in the list. */ | |
2960 | #define FIFO_INCR 20 | |
ccc6cda3 | 2961 | extern char *mktemp (); |
726f6388 JA |
2962 | |
2963 | static char **fifo_list = (char **)NULL; | |
ccc6cda3 JA |
2964 | static int nfifo; |
2965 | static int fifo_list_size; | |
726f6388 JA |
2966 | |
2967 | static void | |
2968 | add_fifo_list (pathname) | |
2969 | char *pathname; | |
2970 | { | |
2971 | if (nfifo >= fifo_list_size - 1) | |
2972 | { | |
2973 | fifo_list_size += FIFO_INCR; | |
2974 | fifo_list = (char **)xrealloc (fifo_list, | |
2975 | fifo_list_size * sizeof (char *)); | |
2976 | } | |
2977 | ||
2978 | fifo_list[nfifo++] = savestring (pathname); | |
2979 | } | |
2980 | ||
2981 | void | |
2982 | unlink_fifo_list () | |
2983 | { | |
ccc6cda3 | 2984 | if (nfifo == 0) |
726f6388 JA |
2985 | return; |
2986 | ||
2987 | while (nfifo--) | |
2988 | { | |
2989 | unlink (fifo_list[nfifo]); | |
2990 | free (fifo_list[nfifo]); | |
2991 | fifo_list[nfifo] = (char *)NULL; | |
2992 | } | |
2993 | nfifo = 0; | |
2994 | } | |
2995 | ||
2996 | static char * | |
2997 | make_named_pipe () | |
2998 | { | |
2999 | char *tname; | |
3000 | ||
3001 | tname = mktemp (savestring ("/tmp/sh-np-XXXXXX")); | |
3002 | if (mkfifo (tname, 0600) < 0) | |
3003 | { | |
3004 | free (tname); | |
3005 | return ((char *)NULL); | |
3006 | } | |
3007 | ||
3008 | add_fifo_list (tname); | |
3009 | return (tname); | |
3010 | } | |
3011 | ||
726f6388 JA |
3012 | #else /* HAVE_DEV_FD */ |
3013 | ||
3014 | /* DEV_FD_LIST is a bitmap of file descriptors attached to pipes the shell | |
3015 | has open to children. NFDS is a count of the number of bits currently | |
3016 | set in DEV_FD_LIST. TOTFDS is a count of the highest possible number | |
3017 | of open files. */ | |
3018 | static char *dev_fd_list = (char *)NULL; | |
ccc6cda3 | 3019 | static int nfds; |
726f6388 JA |
3020 | static int totfds; /* The highest possible number of open files. */ |
3021 | ||
3022 | static void | |
3023 | add_fifo_list (fd) | |
3024 | int fd; | |
3025 | { | |
3026 | if (!dev_fd_list || fd >= totfds) | |
3027 | { | |
3028 | int ofds; | |
3029 | ||
3030 | ofds = totfds; | |
3031 | totfds = getdtablesize (); | |
3032 | if (totfds < 0 || totfds > 256) | |
3033 | totfds = 256; | |
3034 | if (fd > totfds) | |
3035 | totfds = fd + 2; | |
3036 | ||
3037 | dev_fd_list = xrealloc (dev_fd_list, totfds); | |
3038 | bzero (dev_fd_list + ofds, totfds - ofds); | |
3039 | } | |
3040 | ||
3041 | dev_fd_list[fd] = 1; | |
3042 | nfds++; | |
3043 | } | |
3044 | ||
3045 | void | |
3046 | unlink_fifo_list () | |
3047 | { | |
3048 | register int i; | |
3049 | ||
ccc6cda3 | 3050 | if (nfds == 0) |
726f6388 JA |
3051 | return; |
3052 | ||
3053 | for (i = 0; nfds && i < totfds; i++) | |
3054 | if (dev_fd_list[i]) | |
3055 | { | |
3056 | close (i); | |
3057 | dev_fd_list[i] = 0; | |
3058 | nfds--; | |
3059 | } | |
3060 | ||
3061 | nfds = 0; | |
3062 | } | |
3063 | ||
3064 | #if defined (NOTDEF) | |
3065 | print_dev_fd_list () | |
3066 | { | |
3067 | register int i; | |
3068 | ||
3069 | fprintf (stderr, "pid %d: dev_fd_list:", getpid ()); | |
3070 | fflush (stderr); | |
3071 | ||
3072 | for (i = 0; i < totfds; i++) | |
3073 | { | |
3074 | if (dev_fd_list[i]) | |
3075 | fprintf (stderr, " %d", i); | |
3076 | } | |
3077 | fprintf (stderr, "\n"); | |
3078 | } | |
3079 | #endif /* NOTDEF */ | |
3080 | ||
3081 | static char * | |
3082 | make_dev_fd_filename (fd) | |
3083 | int fd; | |
3084 | { | |
bb70624e | 3085 | char *ret, intbuf[16], *p; |
726f6388 | 3086 | |
d166f048 | 3087 | ret = xmalloc (sizeof (DEV_FD_PREFIX) + 4); |
bb70624e JA |
3088 | |
3089 | strcpy (ret, DEV_FD_PREFIX); | |
3090 | p = inttostr (fd, intbuf, sizeof (intbuf)); | |
3091 | strcpy (ret + sizeof (DEV_FD_PREFIX) - 1, p); | |
3092 | ||
726f6388 JA |
3093 | add_fifo_list (fd); |
3094 | return (ret); | |
3095 | } | |
3096 | ||
3097 | #endif /* HAVE_DEV_FD */ | |
3098 | ||
3099 | /* Return a filename that will open a connection to the process defined by | |
3100 | executing STRING. HAVE_DEV_FD, if defined, means open a pipe and return | |
3101 | a filename in /dev/fd corresponding to a descriptor that is one of the | |
3102 | ends of the pipe. If not defined, we use named pipes on systems that have | |
3103 | them. Systems without /dev/fd and named pipes are out of luck. | |
3104 | ||
3105 | OPEN_FOR_READ_IN_CHILD, if 1, means open the named pipe for reading or | |
3106 | use the read end of the pipe and dup that file descriptor to fd 0 in | |
3107 | the child. If OPEN_FOR_READ_IN_CHILD is 0, we open the named pipe for | |
3108 | writing or use the write end of the pipe in the child, and dup that | |
3109 | file descriptor to fd 1 in the child. The parent does the opposite. */ | |
3110 | ||
3111 | static char * | |
3112 | process_substitute (string, open_for_read_in_child) | |
3113 | char *string; | |
3114 | int open_for_read_in_child; | |
3115 | { | |
3116 | char *pathname; | |
3117 | int fd, result; | |
3118 | pid_t old_pid, pid; | |
3119 | #if defined (HAVE_DEV_FD) | |
3120 | int parent_pipe_fd, child_pipe_fd; | |
3121 | int fildes[2]; | |
3122 | #endif /* HAVE_DEV_FD */ | |
3123 | #if defined (JOB_CONTROL) | |
3124 | pid_t old_pipeline_pgrp; | |
ccc6cda3 | 3125 | #endif |
726f6388 | 3126 | |
cce855bc | 3127 | if (!string || !*string || wordexp_only) |
726f6388 JA |
3128 | return ((char *)NULL); |
3129 | ||
3130 | #if !defined (HAVE_DEV_FD) | |
3131 | pathname = make_named_pipe (); | |
3132 | #else /* HAVE_DEV_FD */ | |
3133 | if (pipe (fildes) < 0) | |
3134 | { | |
ccc6cda3 | 3135 | sys_error ("cannot make pipe for process substitution"); |
726f6388 JA |
3136 | return ((char *)NULL); |
3137 | } | |
3138 | /* If OPEN_FOR_READ_IN_CHILD == 1, we want to use the write end of | |
3139 | the pipe in the parent, otherwise the read end. */ | |
3140 | parent_pipe_fd = fildes[open_for_read_in_child]; | |
3141 | child_pipe_fd = fildes[1 - open_for_read_in_child]; | |
d166f048 JA |
3142 | /* Move the parent end of the pipe to some high file descriptor, to |
3143 | avoid clashes with FDs used by the script. */ | |
3144 | parent_pipe_fd = move_to_high_fd (parent_pipe_fd, 1, 64); | |
3145 | ||
726f6388 JA |
3146 | pathname = make_dev_fd_filename (parent_pipe_fd); |
3147 | #endif /* HAVE_DEV_FD */ | |
3148 | ||
3149 | if (!pathname) | |
3150 | { | |
ccc6cda3 | 3151 | sys_error ("cannot make pipe for process substitution"); |
726f6388 JA |
3152 | return ((char *)NULL); |
3153 | } | |
3154 | ||
3155 | old_pid = last_made_pid; | |
3156 | ||
3157 | #if defined (JOB_CONTROL) | |
3158 | old_pipeline_pgrp = pipeline_pgrp; | |
3159 | pipeline_pgrp = shell_pgrp; | |
ccc6cda3 | 3160 | #if 0 |
726f6388 | 3161 | cleanup_the_pipeline (); |
ccc6cda3 JA |
3162 | #else |
3163 | save_pipeline (1); | |
3164 | #endif | |
3165 | #endif /* JOB_CONTROL */ | |
3166 | ||
726f6388 JA |
3167 | pid = make_child ((char *)NULL, 1); |
3168 | if (pid == 0) | |
3169 | { | |
ccc6cda3 | 3170 | reset_terminating_signals (); /* XXX */ |
726f6388 JA |
3171 | /* Cancel traps, in trap.c. */ |
3172 | restore_original_signals (); | |
3173 | setup_async_signals (); | |
ccc6cda3 | 3174 | subshell_environment = SUBSHELL_COMSUB; |
726f6388 | 3175 | } |
ccc6cda3 JA |
3176 | |
3177 | #if defined (JOB_CONTROL) | |
726f6388 JA |
3178 | set_sigchld_handler (); |
3179 | stop_making_children (); | |
3180 | pipeline_pgrp = old_pipeline_pgrp; | |
ccc6cda3 | 3181 | #endif /* JOB_CONTROL */ |
726f6388 JA |
3182 | |
3183 | if (pid < 0) | |
3184 | { | |
ccc6cda3 | 3185 | sys_error ("cannot make child for process substitution"); |
726f6388 JA |
3186 | free (pathname); |
3187 | #if defined (HAVE_DEV_FD) | |
3188 | close (parent_pipe_fd); | |
3189 | close (child_pipe_fd); | |
3190 | #endif /* HAVE_DEV_FD */ | |
3191 | return ((char *)NULL); | |
3192 | } | |
3193 | ||
3194 | if (pid > 0) | |
3195 | { | |
ccc6cda3 JA |
3196 | #if defined (JOB_CONTROL) |
3197 | restore_pipeline (1); | |
3198 | #endif | |
3199 | ||
726f6388 JA |
3200 | last_made_pid = old_pid; |
3201 | ||
3202 | #if defined (JOB_CONTROL) && defined (PGRP_PIPE) | |
3203 | close_pgrp_pipe (); | |
3204 | #endif /* JOB_CONTROL && PGRP_PIPE */ | |
3205 | ||
3206 | #if defined (HAVE_DEV_FD) | |
3207 | close (child_pipe_fd); | |
3208 | #endif /* HAVE_DEV_FD */ | |
3209 | ||
3210 | return (pathname); | |
3211 | } | |
3212 | ||
3213 | set_sigint_handler (); | |
3214 | ||
3215 | #if defined (JOB_CONTROL) | |
3216 | set_job_control (0); | |
3217 | #endif /* JOB_CONTROL */ | |
3218 | ||
3219 | #if !defined (HAVE_DEV_FD) | |
3220 | /* Open the named pipe in the child. */ | |
ccc6cda3 | 3221 | fd = open (pathname, open_for_read_in_child ? O_RDONLY|O_NONBLOCK : O_WRONLY); |
726f6388 JA |
3222 | if (fd < 0) |
3223 | { | |
ccc6cda3 JA |
3224 | sys_error ("cannot open named pipe %s for %s", pathname, |
3225 | open_for_read_in_child ? "reading" : "writing"); | |
726f6388 JA |
3226 | exit (127); |
3227 | } | |
bb70624e JA |
3228 | if (open_for_read_in_child) |
3229 | { | |
3230 | if (unset_nodelay_mode (fd) < 0) | |
3231 | { | |
3232 | sys_error ("cannout reset nodelay mode for fd %d", fd); | |
3233 | exit (127); | |
3234 | } | |
3235 | } | |
726f6388 JA |
3236 | #else /* HAVE_DEV_FD */ |
3237 | fd = child_pipe_fd; | |
3238 | #endif /* HAVE_DEV_FD */ | |
3239 | ||
3240 | if (dup2 (fd, open_for_read_in_child ? 0 : 1) < 0) | |
3241 | { | |
ccc6cda3 JA |
3242 | sys_error ("cannot duplicate named pipe %s as fd %d", pathname, |
3243 | open_for_read_in_child ? 0 : 1); | |
726f6388 JA |
3244 | exit (127); |
3245 | } | |
3246 | ||
3247 | close (fd); | |
3248 | ||
3249 | /* Need to close any files that this process has open to pipes inherited | |
3250 | from its parent. */ | |
3251 | if (current_fds_to_close) | |
3252 | { | |
3253 | close_fd_bitmap (current_fds_to_close); | |
3254 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
3255 | } | |
3256 | ||
3257 | #if defined (HAVE_DEV_FD) | |
3258 | /* Make sure we close the parent's end of the pipe and clear the slot | |
3259 | in the fd list so it is not closed later, if reallocated by, for | |
3260 | instance, pipe(2). */ | |
3261 | close (parent_pipe_fd); | |
3262 | dev_fd_list[parent_pipe_fd] = 0; | |
3263 | #endif /* HAVE_DEV_FD */ | |
3264 | ||
d166f048 | 3265 | result = parse_and_execute (string, "process substitution", (SEVAL_NONINT|SEVAL_NOHIST)); |
726f6388 JA |
3266 | |
3267 | #if !defined (HAVE_DEV_FD) | |
3268 | /* Make sure we close the named pipe in the child before we exit. */ | |
3269 | close (open_for_read_in_child ? 0 : 1); | |
3270 | #endif /* !HAVE_DEV_FD */ | |
3271 | ||
3272 | exit (result); | |
3273 | /*NOTREACHED*/ | |
3274 | } | |
3275 | #endif /* PROCESS_SUBSTITUTION */ | |
3276 | ||
cce855bc JA |
3277 | /***********************************/ |
3278 | /* */ | |
3279 | /* Command Substitution */ | |
3280 | /* */ | |
3281 | /***********************************/ | |
3282 | ||
d166f048 JA |
3283 | static char * |
3284 | read_comsub (fd, quoted) | |
3285 | int fd, quoted; | |
3286 | { | |
3287 | char *istring, buf[128], *bufp; | |
3288 | int bufn, istring_index, istring_size, c; | |
3289 | ||
3290 | istring = (char *)NULL; | |
3291 | istring_index = istring_size = bufn = 0; | |
3292 | ||
3293 | /* Read the output of the command through the pipe. */ | |
3294 | while (1) | |
3295 | { | |
3296 | if (fd < 0) | |
3297 | break; | |
3298 | if (--bufn <= 0) | |
3299 | { | |
bb70624e | 3300 | bufn = zread (fd, buf, sizeof (buf)); |
d166f048 JA |
3301 | if (bufn <= 0) |
3302 | break; | |
3303 | bufp = buf; | |
3304 | } | |
3305 | c = *bufp++; | |
3306 | ||
3307 | /* Add the character to ISTRING, possibly after resizing it. */ | |
3308 | RESIZE_MALLOCED_BUFFER (istring, istring_index, 2, istring_size, DEFAULT_ARRAY_SIZE); | |
3309 | ||
3310 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || c == CTLESC || c == CTLNUL) | |
3311 | istring[istring_index++] = CTLESC; | |
3312 | ||
3313 | istring[istring_index++] = c; | |
3314 | } | |
3315 | ||
3316 | if (istring) | |
3317 | istring[istring_index] = '\0'; | |
3318 | ||
3319 | /* If we read no output, just return now and save ourselves some | |
3320 | trouble. */ | |
3321 | if (istring_index == 0) | |
3322 | { | |
3323 | FREE (istring); | |
3324 | return (char *)NULL; | |
3325 | } | |
3326 | ||
3327 | /* Strip trailing newlines from the output of the command. */ | |
3328 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
3329 | { | |
3330 | while (istring_index > 0) | |
3331 | { | |
3332 | if (istring[istring_index - 1] == '\n') | |
3333 | { | |
3334 | --istring_index; | |
3335 | ||
3336 | /* If the newline was quoted, remove the quoting char. */ | |
3337 | if (istring[istring_index - 1] == CTLESC) | |
3338 | --istring_index; | |
3339 | } | |
3340 | else | |
3341 | break; | |
3342 | } | |
3343 | istring[istring_index] = '\0'; | |
3344 | } | |
3345 | else | |
3346 | strip_trailing (istring, istring_index - 1, 1); | |
3347 | ||
3348 | return istring; | |
3349 | } | |
3350 | ||
726f6388 JA |
3351 | /* Perform command substitution on STRING. This returns a string, |
3352 | possibly quoted. */ | |
bb70624e | 3353 | char * |
726f6388 JA |
3354 | command_substitute (string, quoted) |
3355 | char *string; | |
3356 | int quoted; | |
3357 | { | |
ccc6cda3 JA |
3358 | pid_t pid, old_pid, old_pipeline_pgrp; |
3359 | char *istring; | |
bb70624e | 3360 | int result, fildes[2], function_value; |
726f6388 | 3361 | |
ccc6cda3 | 3362 | istring = (char *)NULL; |
726f6388 JA |
3363 | |
3364 | /* Don't fork () if there is no need to. In the case of no command to | |
3365 | run, just return NULL. */ | |
3366 | if (!string || !*string || (string[0] == '\n' && !string[1])) | |
3367 | return ((char *)NULL); | |
3368 | ||
cce855bc JA |
3369 | if (wordexp_only && read_but_dont_execute) |
3370 | { | |
3371 | last_command_exit_value = 125; | |
3372 | jump_to_top_level (EXITPROG); | |
3373 | } | |
3374 | ||
bb70624e JA |
3375 | /* We're making the assumption here that the command substitution will |
3376 | eventually run a command from the file system. Since we'll run | |
3377 | maybe_make_export_env in this subshell before executing that command, | |
3378 | the parent shell and any other shells it starts will have to remake | |
3379 | the environment. If we make it before we fork, other shells won't | |
3380 | have to. Don't bother if we have any temporary variable assignments, | |
3381 | though, because the export environment will be remade after this | |
3382 | command completes anyway, but do it if all the words to be expanded | |
3383 | are variable assignments. */ | |
3384 | if (subst_assign_varlist == 0 || garglist == 0) | |
3385 | maybe_make_export_env (); /* XXX */ | |
3386 | ||
726f6388 JA |
3387 | /* Pipe the output of executing STRING into the current shell. */ |
3388 | if (pipe (fildes) < 0) | |
3389 | { | |
ccc6cda3 | 3390 | sys_error ("cannot make pipes for command substitution"); |
726f6388 JA |
3391 | goto error_exit; |
3392 | } | |
3393 | ||
3394 | old_pid = last_made_pid; | |
3395 | #if defined (JOB_CONTROL) | |
ccc6cda3 JA |
3396 | old_pipeline_pgrp = pipeline_pgrp; |
3397 | pipeline_pgrp = shell_pgrp; | |
3398 | cleanup_the_pipeline (); | |
3399 | #endif | |
726f6388 | 3400 | |
ccc6cda3 | 3401 | pid = make_child ((char *)NULL, 0); |
726f6388 JA |
3402 | if (pid == 0) |
3403 | /* Reset the signal handlers in the child, but don't free the | |
3404 | trap strings. */ | |
3405 | reset_signal_handlers (); | |
ccc6cda3 JA |
3406 | |
3407 | #if defined (JOB_CONTROL) | |
3408 | set_sigchld_handler (); | |
3409 | stop_making_children (); | |
3410 | pipeline_pgrp = old_pipeline_pgrp; | |
3411 | #endif /* JOB_CONTROL */ | |
726f6388 JA |
3412 | |
3413 | if (pid < 0) | |
3414 | { | |
ccc6cda3 | 3415 | sys_error ("cannot make child for command substitution"); |
726f6388 JA |
3416 | error_exit: |
3417 | ||
3418 | FREE (istring); | |
3419 | close (fildes[0]); | |
3420 | close (fildes[1]); | |
3421 | return ((char *)NULL); | |
3422 | } | |
3423 | ||
3424 | if (pid == 0) | |
3425 | { | |
3426 | set_sigint_handler (); /* XXX */ | |
bb70624e | 3427 | #if 0 |
726f6388 JA |
3428 | #if defined (JOB_CONTROL) |
3429 | set_job_control (0); | |
bb70624e | 3430 | #endif |
726f6388 JA |
3431 | #endif |
3432 | if (dup2 (fildes[1], 1) < 0) | |
3433 | { | |
ccc6cda3 | 3434 | sys_error ("command_substitute: cannot duplicate pipe as fd 1"); |
726f6388 JA |
3435 | exit (EXECUTION_FAILURE); |
3436 | } | |
3437 | ||
3438 | /* If standard output is closed in the parent shell | |
3439 | (such as after `exec >&-'), file descriptor 1 will be | |
3440 | the lowest available file descriptor, and end up in | |
3441 | fildes[0]. This can happen for stdin and stderr as well, | |
3442 | but stdout is more important -- it will cause no output | |
3443 | to be generated from this command. */ | |
3444 | if ((fildes[1] != fileno (stdin)) && | |
3445 | (fildes[1] != fileno (stdout)) && | |
3446 | (fildes[1] != fileno (stderr))) | |
3447 | close (fildes[1]); | |
3448 | ||
3449 | if ((fildes[0] != fileno (stdin)) && | |
3450 | (fildes[0] != fileno (stdout)) && | |
3451 | (fildes[0] != fileno (stderr))) | |
3452 | close (fildes[0]); | |
3453 | ||
3454 | /* The currently executing shell is not interactive. */ | |
3455 | interactive = 0; | |
3456 | ||
ccc6cda3 JA |
3457 | /* This is a subshell environment. */ |
3458 | subshell_environment = SUBSHELL_COMSUB; | |
3459 | ||
726f6388 JA |
3460 | /* Command substitution does not inherit the -e flag. */ |
3461 | exit_immediately_on_error = 0; | |
3462 | ||
3463 | remove_quoted_escapes (string); | |
3464 | ||
ccc6cda3 | 3465 | startup_state = 2; /* see if we can avoid a fork */ |
726f6388 JA |
3466 | /* Give command substitution a place to jump back to on failure, |
3467 | so we don't go back up to main (). */ | |
3468 | result = setjmp (top_level); | |
3469 | ||
bb70624e JA |
3470 | /* If we're running a command substitution inside a shell function, |
3471 | trap `return' so we don't return from the function in the subshell | |
3472 | and go off to never-never land. */ | |
3473 | if (result == 0 && return_catch_flag) | |
3474 | function_value = setjmp (return_catch); | |
3475 | else | |
3476 | function_value = 0; | |
3477 | ||
726f6388 JA |
3478 | if (result == EXITPROG) |
3479 | exit (last_command_exit_value); | |
3480 | else if (result) | |
3481 | exit (EXECUTION_FAILURE); | |
bb70624e JA |
3482 | else if (function_value) |
3483 | exit (return_catch_value); | |
726f6388 | 3484 | else |
d166f048 | 3485 | exit (parse_and_execute (string, "command substitution", SEVAL_NOHIST)); |
726f6388 JA |
3486 | } |
3487 | else | |
3488 | { | |
726f6388 JA |
3489 | #if defined (JOB_CONTROL) && defined (PGRP_PIPE) |
3490 | close_pgrp_pipe (); | |
3491 | #endif /* JOB_CONTROL && PGRP_PIPE */ | |
3492 | ||
3493 | close (fildes[1]); | |
3494 | ||
d166f048 | 3495 | istring = read_comsub (fildes[0], quoted); |
ccc6cda3 | 3496 | |
726f6388 JA |
3497 | close (fildes[0]); |
3498 | ||
b72432fd | 3499 | current_command_subst_pid = pid; |
726f6388 JA |
3500 | last_command_exit_value = wait_for (pid); |
3501 | last_command_subst_pid = pid; | |
3502 | last_made_pid = old_pid; | |
3503 | ||
3504 | #if defined (JOB_CONTROL) | |
3505 | /* If last_command_exit_value > 128, then the substituted command | |
3506 | was terminated by a signal. If that signal was SIGINT, then send | |
3507 | SIGINT to ourselves. This will break out of loops, for instance. */ | |
3508 | if (last_command_exit_value == (128 + SIGINT)) | |
3509 | kill (getpid (), SIGINT); | |
3510 | ||
3511 | /* wait_for gives the terminal back to shell_pgrp. If some other | |
cce855bc JA |
3512 | process group should have it, give it away to that group here. |
3513 | pipeline_pgrp is non-zero only while we are constructing a | |
3514 | pipline, so what we are concerned about is whether or not that | |
3515 | pipeline was started in the background. A pipeline started in | |
3516 | the background should never get the tty back here. */ | |
3517 | #if 0 | |
3518 | if (interactive && pipeline_pgrp != (pid_t)0 && pipeline_pgrp != last_asynchronous_pid) | |
3519 | #else | |
3520 | if (interactive && pipeline_pgrp != (pid_t)0 && subshell_environment != SUBSHELL_ASYNC) | |
3521 | #endif | |
726f6388 JA |
3522 | give_terminal_to (pipeline_pgrp); |
3523 | #endif /* JOB_CONTROL */ | |
3524 | ||
726f6388 JA |
3525 | return (istring); |
3526 | } | |
3527 | } | |
3528 | ||
3529 | /******************************************************** | |
3530 | * * | |
3531 | * Utility functions for parameter expansion * | |
3532 | * * | |
3533 | ********************************************************/ | |
3534 | ||
cce855bc | 3535 | /* Utility functions to manage arrays and their contents for expansion */ |
ccc6cda3 JA |
3536 | |
3537 | #if defined (ARRAY_VARS) | |
ccc6cda3 JA |
3538 | int |
3539 | valid_array_reference (name) | |
3540 | char *name; | |
3541 | { | |
3542 | char *t; | |
3543 | int r, len; | |
3544 | ||
3545 | t = strchr (name, '['); | |
3546 | if (t) | |
3547 | { | |
3548 | *t = '\0'; | |
3549 | r = legal_identifier (name); | |
3550 | *t = '['; | |
3551 | if (r == 0) | |
3552 | return 0; | |
3553 | /* Check for a properly-terminated non-blank subscript. */ | |
3554 | len = skipsubscript (t, 0); | |
3555 | if (t[len] != ']' || len == 1) | |
3556 | return 0; | |
3557 | for (r = 1; r < len; r++) | |
3558 | if (whitespace (t[r]) == 0) | |
3559 | return 1; | |
3560 | return 0; | |
3561 | } | |
3562 | return 0; | |
3563 | } | |
3564 | ||
3565 | /* Expand the array index beginning at S and extending LEN characters. */ | |
3566 | int | |
3567 | array_expand_index (s, len) | |
3568 | char *s; | |
3569 | int len; | |
3570 | { | |
3571 | char *exp, *t; | |
d166f048 | 3572 | int val, expok; |
ccc6cda3 JA |
3573 | |
3574 | exp = xmalloc (len); | |
3575 | strncpy (exp, s, len - 1); | |
3576 | exp[len - 1] = '\0'; | |
3577 | t = maybe_expand_string (exp, 0, expand_string); | |
3578 | this_command_name = (char *)NULL; | |
d166f048 | 3579 | val = evalexp (t, &expok); |
ccc6cda3 JA |
3580 | free (t); |
3581 | free (exp); | |
d166f048 JA |
3582 | if (expok == 0) |
3583 | jump_to_top_level (DISCARD); | |
ccc6cda3 JA |
3584 | return val; |
3585 | } | |
3586 | ||
3587 | /* Return the variable specified by S without any subscript. If non-null, | |
3588 | return the index of the start of the subscript in *SUBP. If non-null, | |
3589 | the length of the subscript is returned in *LENP. */ | |
3590 | SHELL_VAR * | |
3591 | array_variable_part (s, subp, lenp) | |
3592 | char *s, **subp; | |
3593 | int *lenp; | |
3594 | { | |
3595 | char *t; | |
3596 | int ind, ni; | |
3597 | SHELL_VAR *var; | |
3598 | ||
3599 | t = strchr (s, '['); | |
3600 | ind = t - s; | |
3601 | ni = skipsubscript (s, ind); | |
3602 | if (ni <= ind + 1 || s[ni] != ']') | |
726f6388 | 3603 | { |
ccc6cda3 JA |
3604 | report_error ("%s: bad array subscript", s); |
3605 | return ((SHELL_VAR *)NULL); | |
3606 | } | |
3607 | ||
3608 | *t = '\0'; | |
3609 | var = find_variable (s); | |
3610 | *t++ = '['; | |
3611 | ||
3612 | if (subp) | |
3613 | *subp = t; | |
3614 | if (lenp) | |
3615 | *lenp = ni - ind; | |
3616 | return var; | |
3617 | } | |
3618 | ||
3619 | static char * | |
3620 | array_value_internal (s, quoted, allow_all) | |
3621 | char *s; | |
3622 | int quoted, allow_all; | |
3623 | { | |
3624 | int len, ind; | |
cce855bc JA |
3625 | char *retval, *t, *temp; |
3626 | WORD_LIST *l, *list; | |
ccc6cda3 JA |
3627 | SHELL_VAR *var; |
3628 | ||
3629 | var = array_variable_part (s, &t, &len); | |
3630 | ||
3631 | if (var == 0) | |
3632 | return (char *)NULL; | |
3633 | ||
3634 | if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') | |
3635 | { | |
3636 | if (array_p (var) == 0 || allow_all == 0) | |
3637 | { | |
3638 | report_error ("%s: bad array subscript", s); | |
3639 | return ((char *)NULL); | |
3640 | } | |
3641 | l = array_to_word_list (array_cell (var)); | |
3642 | if (l == (WORD_LIST *)NULL) | |
3643 | return ((char *) NULL); | |
3644 | ||
cce855bc | 3645 | #if 0 |
ccc6cda3 JA |
3646 | if (t[0] == '*') /* ${name[*]} */ |
3647 | retval = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? string_list_dollar_star (l) : string_list (l); | |
3648 | else /* ${name[@]} */ | |
3649 | retval = string_list ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? quote_list (l) : l); | |
cce855bc JA |
3650 | #else |
3651 | if (t[0] == '*' && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) | |
3652 | { | |
3653 | temp = string_list_dollar_star (l); | |
3654 | retval = quote_string (temp); | |
3655 | free (temp); | |
3656 | } | |
3657 | else /* ${name[@]} or unquoted ${name[*]} */ | |
3658 | retval = string_list_dollar_at (l, quoted); | |
3659 | #endif | |
ccc6cda3 JA |
3660 | |
3661 | dispose_words (l); | |
3662 | } | |
3663 | else | |
3664 | { | |
3665 | ind = array_expand_index (t, len); | |
3666 | if (ind < 0) | |
726f6388 | 3667 | { |
ccc6cda3 JA |
3668 | report_error ("%s: bad array subscript", var->name); |
3669 | return ((char *)NULL); | |
726f6388 | 3670 | } |
ccc6cda3 | 3671 | if (array_p (var) == 0) |
d166f048 | 3672 | return (ind == 0 ? savestring (value_cell (var)) : (char *)NULL); |
ccc6cda3 JA |
3673 | retval = array_reference (array_cell (var), ind); |
3674 | if (retval) | |
3675 | retval = quote_escapes (retval); | |
726f6388 JA |
3676 | } |
3677 | ||
ccc6cda3 JA |
3678 | return retval; |
3679 | } | |
726f6388 | 3680 | |
ccc6cda3 JA |
3681 | static char * |
3682 | array_value (s, quoted) | |
3683 | char *s; | |
3684 | int quoted; | |
3685 | { | |
3686 | return (array_value_internal (s, quoted, 1)); | |
3687 | } | |
3688 | ||
3689 | /* Return the value of the array indexing expression S as a single string. | |
3690 | If ALLOW_ALL is 0, do not allow `@' and `*' subscripts. This is used | |
3691 | by other parts of the shell such as the arithmetic expression evaluator | |
3692 | in expr.c. */ | |
3693 | char * | |
3694 | get_array_value (s, allow_all) | |
3695 | char *s; | |
3696 | int allow_all; | |
3697 | { | |
3698 | return (array_value_internal (s, 0, allow_all)); | |
3699 | } | |
3700 | ||
3701 | static int | |
3702 | array_length_reference (s) | |
3703 | char *s; | |
3704 | { | |
3705 | int ind, len; | |
3706 | char *t; | |
3707 | ARRAY *array; | |
3708 | SHELL_VAR *var; | |
3709 | ||
3710 | var = array_variable_part (s, &t, &len); | |
726f6388 | 3711 | |
ccc6cda3 JA |
3712 | /* If unbound variables should generate an error, report one and return |
3713 | failure. */ | |
3714 | if ((var == 0 || array_p (var) == 0) && unbound_vars_is_error) | |
726f6388 | 3715 | { |
ccc6cda3 JA |
3716 | ind = *--t; |
3717 | *t = '\0'; | |
3718 | report_error ("%s: unbound variable", s); | |
3719 | *t++ = (char)ind; | |
3720 | return (-1); | |
726f6388 | 3721 | } |
ccc6cda3 JA |
3722 | else if (var == 0) |
3723 | return 0; | |
3724 | else if (array_p (var) == 0) | |
3725 | return 1; | |
726f6388 | 3726 | |
ccc6cda3 | 3727 | array = array_cell (var); |
726f6388 | 3728 | |
ccc6cda3 JA |
3729 | if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') |
3730 | return (array_num_elements (array)); | |
3731 | ||
3732 | ind = array_expand_index (t, len); | |
3733 | if (ind < 0) | |
3734 | { | |
3735 | report_error ("%s: bad array subscript", t); | |
3736 | return (-1); | |
3737 | } | |
3738 | t = array_reference (array, ind); | |
3739 | len = STRLEN (t); | |
3740 | ||
3741 | return (len); | |
726f6388 | 3742 | } |
ccc6cda3 | 3743 | #endif /* ARRAY_VARS */ |
726f6388 JA |
3744 | |
3745 | static int | |
3746 | valid_brace_expansion_word (name, var_is_special) | |
3747 | char *name; | |
3748 | int var_is_special; | |
3749 | { | |
3750 | if (digit (*name) && all_digits (name)) | |
3751 | return 1; | |
3752 | else if (var_is_special) | |
3753 | return 1; | |
ccc6cda3 JA |
3754 | #if defined (ARRAY_VARS) |
3755 | else if (valid_array_reference (name)) | |
3756 | return 1; | |
3757 | #endif /* ARRAY_VARS */ | |
726f6388 JA |
3758 | else if (legal_identifier (name)) |
3759 | return 1; | |
3760 | else | |
3761 | return 0; | |
3762 | } | |
ccc6cda3 | 3763 | |
726f6388 JA |
3764 | /* Parameter expand NAME, and return a new string which is the expansion, |
3765 | or NULL if there was no expansion. | |
3766 | VAR_IS_SPECIAL is non-zero if NAME is one of the special variables in | |
3767 | the shell, e.g., "@", "$", "*", etc. QUOTED, if non-zero, means that | |
3768 | NAME was found inside of a double-quoted expression. */ | |
3769 | static char * | |
3770 | parameter_brace_expand_word (name, var_is_special, quoted) | |
3771 | char *name; | |
3772 | int var_is_special, quoted; | |
3773 | { | |
ccc6cda3 JA |
3774 | char *temp, *tt; |
3775 | int arg_index; | |
3776 | SHELL_VAR *var; | |
3777 | WORD_LIST *l; | |
726f6388 JA |
3778 | |
3779 | /* Handle multiple digit arguments, as in ${11}. */ | |
3780 | if (digit (*name)) | |
3781 | { | |
ccc6cda3 | 3782 | arg_index = atoi (name); |
726f6388 JA |
3783 | temp = get_dollar_var_value (arg_index); |
3784 | } | |
3785 | else if (var_is_special) /* ${@} */ | |
3786 | { | |
cce855bc | 3787 | int sindex; |
726f6388 | 3788 | tt = xmalloc (2 + strlen (name)); |
cce855bc | 3789 | tt[sindex = 0] = '$'; |
726f6388 | 3790 | strcpy (tt + 1, name); |
cce855bc | 3791 | #if 0 |
726f6388 JA |
3792 | l = expand_string_leave_quoted (tt, quoted); |
3793 | free (tt); | |
3794 | temp = string_list (l); | |
3795 | dispose_words (l); | |
cce855bc JA |
3796 | #else |
3797 | temp = param_expand (tt, &sindex, quoted, (int *)NULL, (int *)NULL, | |
3798 | (int *)NULL, (int *)NULL, 0); | |
3799 | free (tt); | |
3800 | #endif | |
726f6388 | 3801 | } |
ccc6cda3 JA |
3802 | #if defined (ARRAY_VARS) |
3803 | else if (valid_array_reference (name)) | |
3804 | { | |
3805 | temp = array_value (name, quoted); | |
3806 | } | |
3807 | #endif | |
3808 | else if (var = find_variable (name)) | |
3809 | { | |
3810 | if (var && invisible_p (var) == 0) | |
3811 | { | |
3812 | #if defined (ARRAY_VARS) | |
3813 | temp = array_p (var) ? array_reference (array_cell (var), 0) : value_cell (var); | |
3814 | #else | |
3815 | temp = value_cell (var); | |
3816 | #endif | |
3817 | ||
3818 | if (temp) | |
3819 | temp = quote_escapes (temp); | |
cce855bc JA |
3820 | |
3821 | if (tempvar_p (var)) | |
3822 | dispose_variable (var); | |
ccc6cda3 JA |
3823 | } |
3824 | else | |
3825 | temp = (char *)NULL; | |
3826 | } | |
726f6388 | 3827 | else |
ccc6cda3 | 3828 | temp = (char *)NULL; |
726f6388 | 3829 | |
726f6388 JA |
3830 | return (temp); |
3831 | } | |
3832 | ||
ccc6cda3 JA |
3833 | /* Expand an indirect reference to a variable: ${!NAME} expands to the |
3834 | value of the variable whose name is the value of NAME. */ | |
3835 | static char * | |
3836 | parameter_brace_expand_indir (name, var_is_special, quoted) | |
3837 | char *name; | |
3838 | int var_is_special, quoted; | |
3839 | { | |
3840 | char *temp, *t; | |
3841 | ||
3842 | t = parameter_brace_expand_word (name, var_is_special, quoted); | |
3843 | if (t == 0) | |
3844 | return (t); | |
bb70624e | 3845 | #if 0 |
ccc6cda3 | 3846 | temp = parameter_brace_expand_word (t, t[0] == '@' && t[1] == '\0', quoted); |
bb70624e JA |
3847 | #else |
3848 | temp = parameter_brace_expand_word (t, SPECIAL_VAR(t, 0), quoted); | |
3849 | #endif | |
ccc6cda3 JA |
3850 | free (t); |
3851 | return temp; | |
3852 | } | |
3853 | ||
726f6388 JA |
3854 | /* Expand the right side of a parameter expansion of the form ${NAMEcVALUE}, |
3855 | depending on the value of C, the separating character. C can be one of | |
ccc6cda3 JA |
3856 | "-", "+", or "=". QUOTED is true if the entire brace expression occurs |
3857 | between double quotes. */ | |
726f6388 | 3858 | static char * |
ccc6cda3 | 3859 | parameter_brace_expand_rhs (name, value, c, quoted, qdollaratp, hasdollarat) |
726f6388 | 3860 | char *name, *value; |
ccc6cda3 | 3861 | int c, quoted, *qdollaratp, *hasdollarat; |
726f6388 JA |
3862 | { |
3863 | WORD_LIST *l; | |
3864 | char *t, *t1, *temp; | |
ccc6cda3 | 3865 | int hasdol; |
726f6388 | 3866 | |
ccc6cda3 JA |
3867 | temp = (*value == '~' || (strchr (value, '~') && unquoted_substring ("=~", value))) |
3868 | ? bash_tilde_expand (value) | |
3869 | : savestring (value); | |
726f6388 | 3870 | |
ccc6cda3 JA |
3871 | /* If the entire expression is between double quotes, we want to treat |
3872 | the value as a double-quoted string, with the exception that we strip | |
3873 | embedded unescaped double quotes. */ | |
3874 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && *temp) | |
726f6388 | 3875 | { |
ccc6cda3 JA |
3876 | hasdol = 0; |
3877 | t = string_extract_double_quoted (temp, &hasdol, 1); | |
726f6388 JA |
3878 | free (temp); |
3879 | temp = t; | |
726f6388 | 3880 | } |
ccc6cda3 | 3881 | |
726f6388 | 3882 | hasdol = 0; |
ccc6cda3 JA |
3883 | /* XXX was 0 not quoted */ |
3884 | l = *temp ? expand_string_for_rhs (temp, quoted, &hasdol, (int *)NULL) | |
3885 | : (WORD_LIST *)0; | |
3886 | if (hasdollarat) | |
3887 | *hasdollarat = hasdol || (l && l->next); | |
726f6388 | 3888 | free (temp); |
726f6388 JA |
3889 | if (l) |
3890 | { | |
ccc6cda3 JA |
3891 | /* The expansion of TEMP returned something. We need to treat things |
3892 | slightly differently if HASDOL is non-zero. */ | |
726f6388 | 3893 | temp = string_list (l); |
ccc6cda3 JA |
3894 | /* If l->next is not null, we know that TEMP contained "$@", since that |
3895 | is the only expansion that creates more than one word. */ | |
3896 | if ((hasdol && quoted) || l->next) | |
3897 | *qdollaratp = 1; | |
726f6388 JA |
3898 | dispose_words (l); |
3899 | } | |
ccc6cda3 | 3900 | else if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && hasdol) |
726f6388 | 3901 | { |
ccc6cda3 JA |
3902 | /* The brace expansion occurred between double quotes and there was |
3903 | a $@ in TEMP. It does not matter if the $@ is quoted, as long as | |
3904 | it does not expand to anything. In this case, we want to return | |
3905 | a quoted empty string. */ | |
726f6388 JA |
3906 | temp = xmalloc (2); |
3907 | temp[0] = CTLNUL; | |
3908 | temp[1] = '\0'; | |
3909 | } | |
3910 | else | |
3911 | temp = (char *)NULL; | |
3912 | ||
3913 | if (c == '-' || c == '+') | |
3914 | return (temp); | |
3915 | ||
3916 | /* c == '=' */ | |
ccc6cda3 | 3917 | t = temp ? savestring (temp) : savestring (""); |
726f6388 JA |
3918 | t1 = dequote_string (t); |
3919 | free (t); | |
3920 | bind_variable (name, t1); | |
3921 | free (t1); | |
3922 | return (temp); | |
3923 | } | |
3924 | ||
3925 | /* Deal with the right hand side of a ${name:?value} expansion in the case | |
3926 | that NAME is null or not set. If VALUE is non-null it is expanded and | |
3927 | used as the error message to print, otherwise a standard message is | |
3928 | printed. */ | |
3929 | static void | |
3930 | parameter_brace_expand_error (name, value) | |
3931 | char *name, *value; | |
3932 | { | |
ccc6cda3 JA |
3933 | WORD_LIST *l; |
3934 | char *temp; | |
3935 | ||
726f6388 JA |
3936 | if (value && *value) |
3937 | { | |
ccc6cda3 JA |
3938 | l = expand_string (value, 0); |
3939 | temp = string_list (l); | |
3940 | report_error ("%s: %s", name, temp ? temp : ""); /* XXX was value not "" */ | |
3941 | FREE (temp); | |
726f6388 JA |
3942 | dispose_words (l); |
3943 | } | |
3944 | else | |
3945 | report_error ("%s: parameter null or not set", name); | |
3946 | ||
3947 | /* Free the data we have allocated during this expansion, since we | |
3948 | are about to longjmp out. */ | |
3949 | free (name); | |
3950 | FREE (value); | |
3951 | } | |
3952 | ||
3953 | /* Return 1 if NAME is something for which parameter_brace_expand_length is | |
3954 | OK to do. */ | |
3955 | static int | |
3956 | valid_length_expression (name) | |
3957 | char *name; | |
3958 | { | |
3959 | return (!name[1] || /* ${#} */ | |
3960 | ((name[1] == '@' || name[1] == '*') && !name[2]) || /* ${#@}, ${#*} */ | |
cce855bc | 3961 | (member (name[1], "-?$!#") && !name[2]) || /* ${#-}, etc. */ |
726f6388 | 3962 | (digit (name[1]) && all_digits (name + 1)) || /* ${#11} */ |
ccc6cda3 JA |
3963 | #if defined (ARRAY_VARS) |
3964 | valid_array_reference (name + 1) || /* ${#a[7]} */ | |
3965 | #endif | |
726f6388 JA |
3966 | legal_identifier (name + 1)); /* ${#PS1} */ |
3967 | } | |
3968 | ||
3969 | /* Handle the parameter brace expansion that requires us to return the | |
3970 | length of a parameter. */ | |
3971 | static int | |
3972 | parameter_brace_expand_length (name) | |
3973 | char *name; | |
3974 | { | |
ccc6cda3 JA |
3975 | char *t, *newname; |
3976 | int number; | |
3977 | WORD_LIST *list; | |
3978 | #if defined (ARRAY_VARS) | |
3979 | SHELL_VAR *var; | |
3980 | #endif | |
3981 | ||
3982 | if (name[1] == '\0') /* ${#} */ | |
3983 | number = number_of_args (); | |
cce855bc JA |
3984 | else if ((name[1] == '@' || name[1] == '*') && name[2] == '\0') /* ${#@}, ${#*} */ |
3985 | number = number_of_args (); | |
3986 | else if (member (name[1], "-?$!#") && name[2] == '\0') | |
3987 | { | |
3988 | /* Take the lengths of some of the shell's special parameters. */ | |
3989 | switch (name[1]) | |
3990 | { | |
3991 | case '-': | |
3992 | t = which_set_flags (); | |
3993 | break; | |
3994 | case '?': | |
3995 | t = itos (last_command_exit_value); | |
3996 | break; | |
3997 | case '$': | |
3998 | t = itos (dollar_dollar_pid); | |
3999 | break; | |
4000 | case '!': | |
4001 | if (last_asynchronous_pid == NO_PID) | |
4002 | t = (char *)NULL; | |
4003 | else | |
4004 | t = itos ((int)last_asynchronous_pid); | |
4005 | break; | |
4006 | case '#': | |
4007 | t = itos (number_of_args ()); | |
4008 | break; | |
4009 | } | |
4010 | number = STRLEN (t); | |
4011 | FREE (t); | |
4012 | } | |
ccc6cda3 JA |
4013 | #if defined (ARRAY_VARS) |
4014 | else if (valid_array_reference (name + 1)) | |
4015 | number = array_length_reference (name + 1); | |
4016 | #endif /* ARRAY_VARS */ | |
cce855bc | 4017 | else |
ccc6cda3 JA |
4018 | { |
4019 | number = 0; | |
4020 | ||
4021 | if (digit (name[1])) /* ${#1} */ | |
4022 | { | |
4023 | t = get_dollar_var_value (atoi (name + 1)); | |
4024 | number = STRLEN (t); | |
4025 | FREE (t); | |
4026 | } | |
4027 | #if defined (ARRAY_VARS) | |
4028 | else if ((var = find_variable (name + 1)) && array_p (var)) | |
4029 | { | |
4030 | t = array_reference (array_cell (var), 0); | |
4031 | number = STRLEN (t); | |
4032 | } | |
4033 | #endif | |
4034 | else /* ${#PS1} */ | |
4035 | { | |
4036 | newname = savestring (name); | |
4037 | newname[0] = '$'; | |
4038 | list = expand_string (newname, Q_DOUBLE_QUOTES); | |
4039 | t = list ? string_list (list) : (char *)NULL; | |
4040 | free (newname); | |
4041 | if (list) | |
4042 | dispose_words (list); | |
4043 | ||
4044 | number = STRLEN (t); | |
4045 | FREE (t); | |
4046 | } | |
4047 | } | |
ccc6cda3 JA |
4048 | |
4049 | return (number); | |
4050 | } | |
4051 | ||
4052 | /* Verify and limit the start and end of the desired substring. If | |
4053 | VTYPE == 0, a regular shell variable is being used; if it is 1, | |
cce855bc | 4054 | then the positional parameters are being used; if it is 2, then |
e8ce775d JA |
4055 | VALUE is really a pointer to an array variable that should be used. |
4056 | Return value is 1 if both values were OK, 0 if there was a problem | |
4057 | with an invalid expression, or -1 if the values were out of range. */ | |
ccc6cda3 JA |
4058 | static int |
4059 | verify_substring_values (value, substr, vtype, e1p, e2p) | |
4060 | char *value, *substr; | |
4061 | int vtype, *e1p, *e2p; | |
4062 | { | |
bb70624e | 4063 | char *t, *temp1, *temp2; |
d166f048 | 4064 | int len, expok; |
ccc6cda3 JA |
4065 | #if defined (ARRAY_VARS) |
4066 | ARRAY *a; | |
4067 | #endif | |
4068 | ||
4069 | t = strchr (substr, ':'); | |
4070 | if (t) | |
4071 | *t = '\0'; | |
d166f048 JA |
4072 | temp1 = maybe_expand_string (substr, Q_DOUBLE_QUOTES, expand_string); |
4073 | *e1p = evalexp (temp1, &expok); | |
ccc6cda3 | 4074 | free (temp1); |
d166f048 JA |
4075 | if (expok == 0) |
4076 | return (0); | |
ccc6cda3 JA |
4077 | |
4078 | switch (vtype) | |
4079 | { | |
4080 | case VT_VARIABLE: | |
d166f048 | 4081 | case VT_ARRAYMEMBER: |
ccc6cda3 JA |
4082 | len = strlen (value); |
4083 | break; | |
4084 | case VT_POSPARMS: | |
4085 | len = number_of_args () + 1; | |
4086 | break; | |
4087 | #if defined (ARRAY_VARS) | |
4088 | case VT_ARRAYVAR: | |
4089 | a = (ARRAY *)value; | |
4090 | len = array_num_elements (a) + 1; | |
4091 | break; | |
4092 | #endif | |
4093 | } | |
4094 | ||
4095 | if (*e1p < 0) /* negative offsets count from end */ | |
4096 | *e1p += len; | |
4097 | ||
d166f048 | 4098 | if (*e1p >= len || *e1p < 0) |
e8ce775d | 4099 | return (-1); |
d166f048 | 4100 | |
ccc6cda3 JA |
4101 | if (t) |
4102 | { | |
4103 | t++; | |
bb70624e JA |
4104 | temp2 = savestring (t); |
4105 | temp1 = maybe_expand_string (temp2, Q_DOUBLE_QUOTES, expand_string); | |
4106 | free (temp2); | |
ccc6cda3 | 4107 | t[-1] = ':'; |
d166f048 | 4108 | *e2p = evalexp (temp1, &expok); |
ccc6cda3 | 4109 | free (temp1); |
d166f048 JA |
4110 | if (expok == 0) |
4111 | return (0); | |
ccc6cda3 JA |
4112 | if (*e2p < 0) |
4113 | { | |
4114 | internal_error ("%s: substring expression < 0", t); | |
4115 | return (0); | |
4116 | } | |
4117 | *e2p += *e1p; /* want E2 chars starting at E1 */ | |
4118 | if (*e2p > len) | |
4119 | *e2p = len; | |
4120 | } | |
4121 | else | |
4122 | *e2p = len; | |
4123 | ||
4124 | return (1); | |
4125 | } | |
4126 | ||
ccc6cda3 | 4127 | /* Return the type of variable specified by VARNAME (simple variable, |
cce855bc | 4128 | positional param, or array variable). Also return the value specified |
ccc6cda3 JA |
4129 | by VARNAME (value of a variable or a reference to an array element). */ |
4130 | static int | |
4131 | get_var_and_type (varname, value, varp, valp) | |
4132 | char *varname, *value; | |
4133 | SHELL_VAR **varp; | |
4134 | char **valp; | |
4135 | { | |
4136 | int vtype; | |
4137 | char *temp; | |
4138 | #if defined (ARRAY_VARS) | |
4139 | SHELL_VAR *v; | |
4140 | #endif | |
4141 | ||
4142 | vtype = (varname[0] == '@' || varname[0] == '*') && varname[1] == '\0'; /* VT_POSPARMS */ | |
4143 | *varp = (SHELL_VAR *)NULL; | |
4144 | ||
4145 | #if defined (ARRAY_VARS) | |
4146 | if (valid_array_reference (varname)) | |
4147 | { | |
4148 | v = array_variable_part (varname, &temp, (int *)0); | |
4149 | if (v && array_p (v)) | |
4150 | { | |
d166f048 | 4151 | if ((temp[0] == '@' || temp[0] == '*') && temp[1] == ']') |
ccc6cda3 JA |
4152 | { |
4153 | vtype = VT_ARRAYVAR; | |
4154 | *valp = (char *)array_cell (v); | |
4155 | } | |
4156 | else | |
4157 | { | |
d166f048 | 4158 | vtype = VT_ARRAYMEMBER; |
ccc6cda3 JA |
4159 | *valp = array_value (varname, 1); |
4160 | } | |
4161 | *varp = v; | |
4162 | } | |
4163 | else | |
4164 | return -1; | |
4165 | } | |
4166 | else if ((v = find_variable (varname)) && array_p (v)) | |
4167 | { | |
4168 | vtype = VT_VARIABLE; | |
4169 | *varp = v; | |
4170 | *valp = array_reference (array_cell (v), 0); | |
4171 | } | |
4172 | else | |
4173 | #endif | |
4174 | *valp = value; | |
4175 | ||
4176 | return vtype; | |
4177 | } | |
4178 | ||
cce855bc JA |
4179 | /******************************************************/ |
4180 | /* */ | |
4181 | /* Functions to extract substrings of variable values */ | |
4182 | /* */ | |
4183 | /******************************************************/ | |
4184 | ||
ccc6cda3 JA |
4185 | /* Process a variable substring expansion: ${name:e1[:e2]}. If VARNAME |
4186 | is `@', use the positional parameters; otherwise, use the value of | |
4187 | VARNAME. If VARNAME is an array variable, use the array elements. */ | |
4188 | ||
4189 | static char * | |
4190 | parameter_brace_substring (varname, value, substr, quoted) | |
4191 | char *varname, *value, *substr; | |
4192 | int quoted; | |
4193 | { | |
e8ce775d | 4194 | int e1, e2, vtype, r; |
ccc6cda3 JA |
4195 | char *temp, *val; |
4196 | SHELL_VAR *v; | |
4197 | ||
4198 | if (value == 0) | |
4199 | return ((char *)NULL); | |
4200 | ||
4201 | this_command_name = varname; | |
4202 | ||
4203 | vtype = get_var_and_type (varname, value, &v, &val); | |
4204 | if (vtype == -1) | |
4205 | return ((char *)NULL); | |
4206 | ||
e8ce775d JA |
4207 | r = verify_substring_values (val, substr, vtype, &e1, &e2); |
4208 | if (r <= 0) | |
d166f048 JA |
4209 | { |
4210 | if (val && vtype == VT_ARRAYMEMBER) | |
4211 | free (val); | |
e8ce775d | 4212 | return ((r == 0) ? &expand_param_error : (char *)NULL); |
d166f048 | 4213 | } |
ccc6cda3 JA |
4214 | |
4215 | switch (vtype) | |
4216 | { | |
4217 | case VT_VARIABLE: | |
d166f048 | 4218 | case VT_ARRAYMEMBER: |
ccc6cda3 JA |
4219 | temp = quoted ? quoted_substring (value, e1, e2) : substring (value, e1, e2); |
4220 | break; | |
4221 | case VT_POSPARMS: | |
4222 | temp = pos_params (varname, e1, e2, quoted); | |
4223 | break; | |
4224 | #if defined (ARRAY_VARS) | |
4225 | case VT_ARRAYVAR: | |
4226 | temp = array_subrange (array_cell (v), e1, e2, quoted); | |
4227 | break; | |
4228 | #endif | |
4229 | } | |
4230 | ||
4231 | return temp; | |
4232 | } | |
4233 | ||
cce855bc JA |
4234 | /****************************************************************/ |
4235 | /* */ | |
4236 | /* Functions to perform pattern substitution on variable values */ | |
4237 | /* */ | |
4238 | /****************************************************************/ | |
4239 | ||
ccc6cda3 JA |
4240 | char * |
4241 | pat_subst (string, pat, rep, mflags) | |
4242 | char *string, *pat, *rep; | |
4243 | int mflags; | |
4244 | { | |
4245 | char *ret, *s, *e, *str; | |
4246 | int rsize, rptr, l, replen, mtype; | |
4247 | ||
b72432fd JA |
4248 | mtype = mflags & MATCH_TYPEMASK; |
4249 | ||
4250 | /* Special cases: | |
4251 | * 1. A null pattern with mtype == MATCH_BEG means to prefix STRING | |
4252 | * with REP and return the result. | |
4253 | * 2. A null pattern with mtype == MATCH_END means to append REP to | |
4254 | * STRING and return the result. | |
4255 | */ | |
4256 | if ((pat == 0 || *pat == 0) && (mtype == MATCH_BEG || mtype == MATCH_END)) | |
4257 | { | |
4258 | replen = STRLEN (rep); | |
4259 | l = strlen (string); | |
4260 | ret = xmalloc (replen + l + 2); | |
bb70624e JA |
4261 | if (replen == 0) |
4262 | strcpy (ret, string); | |
4263 | else if (mtype == MATCH_BEG) | |
b72432fd JA |
4264 | { |
4265 | strcpy (ret, rep); | |
4266 | strcpy (ret + replen, string); | |
4267 | } | |
4268 | else | |
4269 | { | |
4270 | strcpy (ret, string); | |
4271 | strcpy (ret + l, rep); | |
4272 | } | |
4273 | return (ret); | |
4274 | } | |
4275 | ||
ccc6cda3 JA |
4276 | ret = xmalloc (rsize = 64); |
4277 | ret[0] = '\0'; | |
4278 | ||
ccc6cda3 JA |
4279 | for (replen = STRLEN (rep), rptr = 0, str = string;;) |
4280 | { | |
4281 | if (match_pattern (str, pat, mtype, &s, &e) == 0) | |
4282 | break; | |
4283 | l = s - str; | |
4284 | RESIZE_MALLOCED_BUFFER (ret, rptr, (l + replen), rsize, 64); | |
4285 | ||
4286 | /* OK, now copy the leading unmatched portion of the string (from | |
4287 | str to s) to ret starting at rptr (the current offset). Then copy | |
4288 | the replacement string at ret + rptr + (s - str). Increment | |
4289 | rptr (if necessary) and str and go on. */ | |
4290 | if (l) | |
4291 | { | |
4292 | strncpy (ret + rptr, str, l); | |
4293 | rptr += l; | |
4294 | } | |
4295 | if (replen) | |
4296 | { | |
4297 | strncpy (ret + rptr, rep, replen); | |
4298 | rptr += replen; | |
4299 | } | |
4300 | str = e; /* e == end of match */ | |
4301 | if (((mflags & MATCH_GLOBREP) == 0) || mtype != MATCH_ANY) | |
4302 | break; | |
4303 | } | |
4304 | ||
4305 | /* Now copy the unmatched portion of the input string */ | |
4306 | if (*str) | |
d166f048 JA |
4307 | { |
4308 | RESIZE_MALLOCED_BUFFER (ret, rptr, STRLEN(str) + 1, rsize, 64); | |
4309 | strcpy (ret + rptr, str); | |
4310 | } | |
ccc6cda3 JA |
4311 | else |
4312 | ret[rptr] = '\0'; | |
4313 | ||
4314 | return ret; | |
4315 | } | |
4316 | ||
4317 | /* Do pattern match and replacement on the positional parameters. */ | |
4318 | static char * | |
4319 | pos_params_pat_subst (string, pat, rep, mflags) | |
4320 | char *string, *pat, *rep; | |
4321 | int mflags; | |
4322 | { | |
4323 | WORD_LIST *save, *params; | |
4324 | WORD_DESC *w; | |
4325 | char *ret; | |
4326 | ||
4327 | save = params = list_rest_of_args (); | |
4328 | if (save == 0) | |
4329 | return ((char *)NULL); | |
4330 | ||
4331 | for ( ; params; params = params->next) | |
4332 | { | |
4333 | ret = pat_subst (params->word->word, pat, rep, mflags); | |
4334 | w = make_bare_word (ret); | |
4335 | dispose_word (params->word); | |
4336 | params->word = w; | |
4337 | FREE (ret); | |
4338 | } | |
4339 | ||
4340 | ret = string_list ((mflags & MATCH_QUOTED) ? quote_list (save) : save); | |
4341 | dispose_words (save); | |
4342 | ||
4343 | return (ret); | |
4344 | } | |
4345 | ||
cce855bc JA |
4346 | /* Perform pattern substitution on VALUE, which is the expansion of |
4347 | VARNAME. PATSUB is an expression supplying the pattern to match | |
4348 | and the string to substitute. QUOTED is a flags word containing | |
4349 | the type of quoting currently in effect. */ | |
ccc6cda3 JA |
4350 | static char * |
4351 | parameter_brace_patsub (varname, value, patsub, quoted) | |
4352 | char *varname, *value, *patsub; | |
4353 | int quoted; | |
4354 | { | |
4355 | int vtype, mflags; | |
bb70624e | 4356 | char *val, *temp, *pat, *rep, *p, *lpatsub; |
ccc6cda3 JA |
4357 | SHELL_VAR *v; |
4358 | ||
4359 | if (value == 0) | |
4360 | return ((char *)NULL); | |
4361 | ||
4362 | this_command_name = varname; | |
4363 | ||
4364 | vtype = get_var_and_type (varname, value, &v, &val); | |
4365 | if (vtype == -1) | |
4366 | return ((char *)NULL); | |
4367 | ||
4368 | mflags = 0; | |
4369 | if (*patsub == '/') | |
4370 | { | |
4371 | mflags |= MATCH_GLOBREP; | |
4372 | patsub++; | |
4373 | } | |
bb70624e JA |
4374 | /* Malloc this because maybe_expand_string or one of the expansion functions |
4375 | in its call chain may free it on a substitution error. */ | |
4376 | lpatsub = savestring (patsub); | |
ccc6cda3 JA |
4377 | |
4378 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
4379 | mflags |= MATCH_QUOTED; | |
4380 | ||
bb70624e | 4381 | if (rep = quoted_strchr (lpatsub, '/', ST_BACKSL)) |
ccc6cda3 JA |
4382 | *rep++ = '\0'; |
4383 | else | |
4384 | rep = (char *)NULL; | |
4385 | ||
4386 | if (rep && *rep == '\0') | |
4387 | rep = (char *)NULL; | |
4388 | ||
4389 | /* Expand PAT and REP for command, variable and parameter, arithmetic, | |
4390 | and process substitution. Also perform quote removal. Do not | |
4391 | perform word splitting or filename generation. */ | |
cce855bc | 4392 | #if 0 |
bb70624e | 4393 | pat = maybe_expand_string (lpatsub, quoted, expand_string_unsplit); |
cce855bc | 4394 | #else |
bb70624e | 4395 | pat = maybe_expand_string (lpatsub, (quoted & ~Q_DOUBLE_QUOTES), expand_string_unsplit); |
cce855bc | 4396 | #endif |
bb70624e | 4397 | |
ccc6cda3 | 4398 | if (rep) |
d166f048 JA |
4399 | { |
4400 | if ((mflags & MATCH_QUOTED) == 0) | |
4401 | rep = maybe_expand_string (rep, quoted, expand_string_unsplit); | |
4402 | else | |
4403 | rep = expand_string_to_string (rep, quoted, expand_string_unsplit); | |
4404 | } | |
ccc6cda3 JA |
4405 | |
4406 | p = pat; | |
d166f048 | 4407 | if (pat && pat[0] == '#') |
ccc6cda3 JA |
4408 | { |
4409 | mflags |= MATCH_BEG; | |
4410 | p++; | |
4411 | } | |
d166f048 | 4412 | else if (pat && pat[0] == '%') |
ccc6cda3 JA |
4413 | { |
4414 | mflags |= MATCH_END; | |
4415 | p++; | |
4416 | } | |
4417 | else | |
4418 | mflags |= MATCH_ANY; | |
4419 | ||
cce855bc JA |
4420 | /* OK, we now want to substitute REP for PAT in VAL. If |
4421 | flags & MATCH_GLOBREP is non-zero, the substitution is done | |
4422 | everywhere, otherwise only the first occurrence of PAT is | |
4423 | replaced. */ | |
ccc6cda3 JA |
4424 | switch (vtype) |
4425 | { | |
4426 | case VT_VARIABLE: | |
d166f048 | 4427 | case VT_ARRAYMEMBER: |
ccc6cda3 JA |
4428 | temp = pat_subst (val, p, rep, mflags); |
4429 | break; | |
4430 | case VT_POSPARMS: | |
4431 | temp = pos_params_pat_subst (val, p, rep, mflags); | |
4432 | break; | |
4433 | #if defined (ARRAY_VARS) | |
4434 | case VT_ARRAYVAR: | |
4435 | temp = array_pat_subst (array_cell (v), p, rep, mflags); | |
4436 | break; | |
4437 | #endif | |
4438 | } | |
4439 | ||
d166f048 JA |
4440 | if (val && v && array_p (v) && vtype == VT_ARRAYMEMBER) |
4441 | free (val); | |
4442 | ||
ccc6cda3 JA |
4443 | FREE (pat); |
4444 | FREE (rep); | |
bb70624e | 4445 | free (lpatsub); |
ccc6cda3 JA |
4446 | |
4447 | return temp; | |
4448 | } | |
4449 | ||
cce855bc JA |
4450 | /****************************************************************/ |
4451 | /* */ | |
4452 | /* Functions to perform parameter expansion on a string */ | |
4453 | /* */ | |
4454 | /****************************************************************/ | |
4455 | ||
ccc6cda3 JA |
4456 | /* ${[#][!]name[[:]#[#]%[%]-=?+[word][:e1[:e2]]]} */ |
4457 | static char * | |
4458 | parameter_brace_expand (string, indexp, quoted, quoted_dollar_atp, contains_dollar_at) | |
4459 | char *string; | |
4460 | int *indexp, quoted, *quoted_dollar_atp, *contains_dollar_at; | |
4461 | { | |
4462 | int check_nullness, var_is_set, var_is_null, var_is_special; | |
4463 | int want_substring, want_indir, want_patsub; | |
4464 | char *name, *value, *temp, *temp1; | |
4465 | int t_index, sindex, c, number; | |
4466 | ||
ccc6cda3 JA |
4467 | value = (char *)NULL; |
4468 | var_is_set = var_is_null = var_is_special = check_nullness = 0; | |
4469 | want_substring = want_indir = want_patsub = 0; | |
4470 | ||
cce855bc JA |
4471 | sindex = *indexp; |
4472 | t_index = ++sindex; | |
4473 | name = string_extract (string, &t_index, "#%:-=?+/}", 1); | |
4474 | ||
4475 | /* If the name really consists of a special variable, then make sure | |
4476 | that we have the entire name. We don't allow indirect references | |
4477 | to special variables except `#', `?', `@' and `*'. */ | |
4478 | if ((sindex == t_index && | |
ccc6cda3 JA |
4479 | (string[t_index] == '-' || |
4480 | string[t_index] == '?' || | |
cce855bc JA |
4481 | string[t_index] == '#')) || |
4482 | (sindex == t_index - 1 && string[sindex] == '!' && | |
4483 | (string[t_index] == '#' || | |
4484 | string[t_index] == '?' || | |
4485 | string[t_index] == '@' || | |
4486 | string[t_index] == '*'))) | |
ccc6cda3 JA |
4487 | { |
4488 | t_index++; | |
4489 | free (name); | |
4490 | temp1 = string_extract (string, &t_index, "#%:-=?+/}", 0); | |
4491 | name = xmalloc (3 + (strlen (temp1))); | |
4492 | *name = string[sindex]; | |
4493 | if (string[sindex] == '!') | |
4494 | { | |
cce855bc JA |
4495 | /* indirect reference of $#, $?, $@, or $* */ |
4496 | name[1] = string[sindex + 1]; | |
4497 | strcpy (name + 2, temp1); | |
ccc6cda3 | 4498 | } |
cce855bc | 4499 | else |
ccc6cda3 JA |
4500 | strcpy (name + 1, temp1); |
4501 | free (temp1); | |
4502 | } | |
4503 | sindex = t_index; | |
4504 | ||
4505 | /* Find out what character ended the variable name. Then | |
4506 | do the appropriate thing. */ | |
4507 | if (c = string[sindex]) | |
4508 | sindex++; | |
4509 | ||
4510 | /* If c is followed by one of the valid parameter expansion | |
4511 | characters, move past it as normal. If not, assume that | |
4512 | a substring specification is being given, and do not move | |
4513 | past it. */ | |
4514 | if (c == ':' && member (string[sindex], "-=?+")) | |
4515 | { | |
4516 | check_nullness++; | |
4517 | if (c = string[sindex]) | |
4518 | sindex++; | |
4519 | } | |
cce855bc | 4520 | else if (c == ':' && string[sindex] != RBRACE) |
ccc6cda3 | 4521 | want_substring = 1; |
cce855bc | 4522 | else if (c == '/' && string[sindex] != RBRACE) |
ccc6cda3 JA |
4523 | want_patsub = 1; |
4524 | ||
cce855bc JA |
4525 | /* Catch the valid and invalid brace expressions that made it through the |
4526 | tests above. */ | |
4527 | /* ${#-} is a valid expansion and means to take the length of $-. | |
4528 | Similarly for ${#?} and ${##}... */ | |
4529 | if (name[0] == '#' && name[1] == '\0' && check_nullness == 0 && | |
4530 | member (c, "-?#") && string[sindex] == RBRACE) | |
4531 | { | |
4532 | name = xrealloc (name, 3); | |
4533 | name[1] = c; | |
4534 | name[2] = '\0'; | |
4535 | c = string[sindex++]; | |
4536 | } | |
4537 | ||
4538 | /* ...but ${#%}, ${#:}, ${#=}, ${#+}, and ${#/} are errors. */ | |
4539 | if (name[0] == '#' && name[1] == '\0' && check_nullness == 0 && | |
4540 | member (c, "%:=+/") && string[sindex] == RBRACE) | |
4541 | { | |
4542 | temp = (char *)NULL; | |
4543 | goto bad_substitution; | |
4544 | } | |
4545 | ||
4546 | /* Indirect expansion begins with a `!'. A valid indirect expansion is | |
4547 | either a variable name, one of the positional parameters or a special | |
4548 | variable that expands to one of the positional parameters. */ | |
4549 | want_indir = *name == '!' && | |
4550 | (legal_variable_starter (name[1]) || digit (name[1]) || member (name[1], "#?@*")); | |
ccc6cda3 JA |
4551 | |
4552 | /* Determine the value of this variable. */ | |
4553 | ||
cce855bc | 4554 | /* Check for special variables, directly referenced. */ |
bb70624e | 4555 | if (SPECIAL_VAR (name, want_indir)) |
ccc6cda3 JA |
4556 | var_is_special++; |
4557 | ||
cce855bc JA |
4558 | /* Check for special expansion things, like the length of a parameter */ |
4559 | if (*name == '#' && name[1]) | |
ccc6cda3 | 4560 | { |
cce855bc JA |
4561 | /* If we are not pointing at the character just after the |
4562 | closing brace, then we haven't gotten all of the name. | |
4563 | Since it begins with a special character, this is a bad | |
4564 | substitution. Also check NAME for validity before trying | |
4565 | to go on. */ | |
4566 | if (string[sindex - 1] != RBRACE || (valid_length_expression (name) == 0)) | |
ccc6cda3 JA |
4567 | { |
4568 | temp = (char *)NULL; | |
4569 | goto bad_substitution; | |
4570 | } | |
4571 | ||
4572 | number = parameter_brace_expand_length (name); | |
4573 | free (name); | |
4574 | ||
4575 | *indexp = sindex; | |
4576 | return ((number < 0) ? &expand_param_error : itos (number)); | |
4577 | } | |
4578 | ||
4579 | /* ${@} is identical to $@. */ | |
4580 | if (name[0] == '@' && name[1] == '\0') | |
4581 | { | |
4582 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) | |
4583 | *quoted_dollar_atp = 1; | |
4584 | ||
4585 | if (contains_dollar_at) | |
4586 | *contains_dollar_at = 1; | |
4587 | } | |
4588 | ||
bb70624e JA |
4589 | /* Process ${PREFIX*} expansion. */ |
4590 | if (want_indir && string[sindex - 1] == RBRACE && | |
4591 | (string[sindex - 2] == '*' || string[sindex - 2] == '@') && | |
4592 | legal_variable_starter (name[1])) | |
4593 | { | |
4594 | char **x; | |
4595 | WORD_LIST *xlist; | |
4596 | ||
4597 | temp1 = savestring (name + 1); | |
4598 | number = strlen (temp1); | |
4599 | temp1[number - 1] = '\0'; | |
4600 | x = all_variables_matching_prefix (temp1); | |
4601 | xlist = argv_to_word_list (x, 1, 0); | |
4602 | temp = string_list_dollar_star (xlist, quoted); | |
4603 | free (x); | |
4604 | free (xlist); | |
4605 | free (temp1); | |
4606 | *indexp = sindex; | |
4607 | return (temp); | |
4608 | } | |
4609 | ||
ccc6cda3 JA |
4610 | /* Make sure that NAME is valid before trying to go on. */ |
4611 | if (valid_brace_expansion_word (want_indir ? name + 1 : name, | |
4612 | var_is_special) == 0) | |
4613 | { | |
4614 | temp = (char *)NULL; | |
4615 | goto bad_substitution; | |
4616 | } | |
4617 | ||
4618 | if (want_indir) | |
4619 | temp = parameter_brace_expand_indir (name + 1, var_is_special, quoted); | |
4620 | else | |
4621 | temp = parameter_brace_expand_word (name, var_is_special, quoted); | |
4622 | ||
4623 | #if defined (ARRAY_VARS) | |
cce855bc | 4624 | #if 0 |
ccc6cda3 | 4625 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && valid_array_reference (name)) |
cce855bc JA |
4626 | #else |
4627 | if (valid_array_reference (name)) | |
4628 | #endif | |
ccc6cda3 JA |
4629 | { |
4630 | temp1 = strchr (name, '['); | |
4631 | if (temp1 && temp1[1] == '@' && temp1[2] == ']') | |
4632 | { | |
4633 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) | |
4634 | *quoted_dollar_atp = 1; | |
4635 | if (contains_dollar_at) | |
4636 | *contains_dollar_at = 1; | |
cce855bc JA |
4637 | } /* [ */ |
4638 | /* ${array[*]}, when unquoted, should be treated like ${array[@]}, | |
4639 | which should result in separate words even when IFS is unset. */ | |
4640 | if (temp1 && temp1[1] == '*' && temp1[2] == ']' && quoted == 0) | |
4641 | { | |
4642 | if (contains_dollar_at) | |
4643 | *contains_dollar_at = 1; | |
ccc6cda3 JA |
4644 | } |
4645 | } | |
4646 | #endif | |
4647 | ||
4648 | var_is_set = temp != (char *)0; | |
4649 | var_is_null = check_nullness && (var_is_set == 0 || *temp == 0); | |
4650 | ||
4651 | /* Get the rest of the stuff inside the braces. */ | |
cce855bc | 4652 | if (c && c != RBRACE) |
ccc6cda3 JA |
4653 | { |
4654 | /* Extract the contents of the ${ ... } expansion | |
4655 | according to the Posix.2 rules. */ | |
4656 | value = extract_dollar_brace_string (string, &sindex, quoted); | |
cce855bc | 4657 | if (string[sindex] == RBRACE) |
ccc6cda3 JA |
4658 | sindex++; |
4659 | else | |
4660 | goto bad_substitution; | |
4661 | } | |
4662 | else | |
4663 | value = (char *)NULL; | |
726f6388 | 4664 | |
ccc6cda3 JA |
4665 | *indexp = sindex; |
4666 | ||
4667 | /* If this is a substring spec, process it and add the result. */ | |
4668 | if (want_substring) | |
726f6388 | 4669 | { |
ccc6cda3 JA |
4670 | temp1 = parameter_brace_substring (name, temp, value, quoted); |
4671 | FREE (name); | |
4672 | FREE (value); | |
4673 | FREE (temp); | |
4674 | return (temp1); | |
726f6388 | 4675 | } |
ccc6cda3 | 4676 | else if (want_patsub) |
726f6388 | 4677 | { |
ccc6cda3 JA |
4678 | temp1 = parameter_brace_patsub (name, temp, value, quoted); |
4679 | FREE (name); | |
4680 | FREE (value); | |
4681 | FREE (temp); | |
4682 | return (temp1); | |
4683 | } | |
726f6388 | 4684 | |
ccc6cda3 JA |
4685 | /* Do the right thing based on which character ended the variable name. */ |
4686 | switch (c) | |
4687 | { | |
4688 | default: | |
4689 | case '\0': | |
4690 | bad_substitution: | |
4691 | report_error ("%s: bad substitution", string ? string : "??"); | |
4692 | FREE (value); | |
4693 | FREE (temp); | |
4694 | free (name); | |
4695 | return &expand_param_error; | |
4696 | ||
cce855bc | 4697 | case RBRACE: |
ccc6cda3 JA |
4698 | if (var_is_set == 0 && unbound_vars_is_error) |
4699 | { | |
4700 | report_error ("%s: unbound variable", name); | |
4701 | FREE (value); | |
4702 | FREE (temp); | |
4703 | free (name); | |
4704 | last_command_exit_value = EXECUTION_FAILURE; | |
d166f048 | 4705 | return (interactive_shell ? &expand_param_error : &expand_param_fatal); |
726f6388 | 4706 | } |
ccc6cda3 | 4707 | break; |
726f6388 | 4708 | |
ccc6cda3 JA |
4709 | case '#': /* ${param#[#]pattern} */ |
4710 | case '%': /* ${param%[%]pattern} */ | |
4711 | if (value == 0 || *value == '\0' || temp == 0 || *temp == '\0') | |
4712 | { | |
4713 | FREE (value); | |
4714 | break; | |
4715 | } | |
4716 | if ((name[0] == '@' || name[0] == '*') && name[1] == '\0') | |
4717 | temp1 = parameter_list_remove_pattern (value, name[0], c, quoted); | |
4718 | #if defined (ARRAY_VARS) | |
4719 | else if (valid_array_reference (name)) | |
4720 | temp1 = array_remove_pattern (value, name, temp, c, quoted); | |
4721 | #endif | |
4722 | else | |
4723 | temp1 = parameter_brace_remove_pattern (value, temp, c, quoted); | |
4724 | free (temp); | |
4725 | free (value); | |
4726 | temp = temp1; | |
4727 | break; | |
4728 | ||
4729 | case '-': | |
4730 | case '=': | |
4731 | case '?': | |
4732 | case '+': | |
4733 | if (var_is_set && var_is_null == 0) | |
4734 | { | |
4735 | /* We don't want the value of the named variable for | |
4736 | anything, just the value of the right hand side. */ | |
bb70624e JA |
4737 | |
4738 | /* XXX -- if we're double-quoted and the named variable is "$@", | |
4739 | we want to turn off any special handling of "$@" -- we're not | |
4740 | using it, so whatever is on the rhs applies. */ | |
4741 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) | |
4742 | *quoted_dollar_atp = 0; | |
4743 | if (contains_dollar_at) | |
4744 | *contains_dollar_at = 0; | |
4745 | ||
ccc6cda3 JA |
4746 | if (c == '+') |
4747 | { | |
4748 | FREE (temp); | |
4749 | if (value) | |
4750 | { | |
4751 | temp = parameter_brace_expand_rhs (name, value, c, | |
4752 | quoted, | |
4753 | quoted_dollar_atp, | |
4754 | contains_dollar_at); | |
4755 | free (value); | |
4756 | } | |
4757 | else | |
4758 | temp = (char *)NULL; | |
4759 | } | |
4760 | else | |
4761 | { | |
4762 | FREE (value); | |
4763 | } | |
4764 | /* Otherwise do nothing; just use the value in TEMP. */ | |
726f6388 | 4765 | } |
ccc6cda3 JA |
4766 | else /* VAR not set or VAR is NULL. */ |
4767 | { | |
4768 | FREE (temp); | |
4769 | temp = (char *)NULL; | |
4770 | if (c == '=' && var_is_special) | |
4771 | { | |
4772 | report_error ("$%s: cannot assign in this way", name); | |
4773 | free (name); | |
4774 | free (value); | |
4775 | return &expand_param_error; | |
4776 | } | |
4777 | else if (c == '?') | |
4778 | { | |
4779 | parameter_brace_expand_error (name, value); | |
4780 | return (interactive ? &expand_param_error : &expand_param_fatal); | |
4781 | } | |
4782 | else if (c != '+') | |
4783 | temp = parameter_brace_expand_rhs (name, value, c, quoted, | |
4784 | quoted_dollar_atp, | |
4785 | contains_dollar_at); | |
4786 | free (value); | |
726f6388 | 4787 | } |
ccc6cda3 | 4788 | break; |
726f6388 | 4789 | } |
ccc6cda3 JA |
4790 | free (name); |
4791 | return (temp); | |
726f6388 JA |
4792 | } |
4793 | ||
cce855bc JA |
4794 | /* Expand a single ${xxx} expansion. The braces are optional. When |
4795 | the braces are used, parameter_brace_expand() does the work, | |
4796 | possibly calling param_expand recursively. */ | |
4797 | static char * | |
4798 | param_expand (string, sindex, quoted, expanded_something, | |
4799 | contains_dollar_at, quoted_dollar_at_p, had_quoted_null_p, | |
4800 | pflags) | |
4801 | char *string; | |
4802 | int *sindex, quoted, *expanded_something, *contains_dollar_at; | |
4803 | int *quoted_dollar_at_p, *had_quoted_null_p, pflags; | |
4804 | { | |
4805 | char *temp, *temp1; | |
4806 | int zindex, number, c, t_index, expok; | |
4807 | SHELL_VAR *var; | |
4808 | WORD_LIST *list, *tlist; | |
4809 | ||
4810 | zindex = *sindex; | |
4811 | c = string[++zindex]; | |
4812 | ||
4813 | temp = (char *)NULL; | |
4814 | ||
4815 | /* Do simple cases first. Switch on what follows '$'. */ | |
4816 | switch (c) | |
4817 | { | |
4818 | /* $0 .. $9? */ | |
4819 | case '0': | |
4820 | case '1': | |
4821 | case '2': | |
4822 | case '3': | |
4823 | case '4': | |
4824 | case '5': | |
4825 | case '6': | |
4826 | case '7': | |
4827 | case '8': | |
4828 | case '9': | |
4829 | temp1 = dollar_vars[digit_value (c)]; | |
4830 | if (unbound_vars_is_error && temp1 == (char *)NULL) | |
4831 | { | |
4832 | report_error ("$%c: unbound variable", c); | |
4833 | last_command_exit_value = EXECUTION_FAILURE; | |
4834 | return (interactive_shell ? &expand_param_error : &expand_param_fatal); | |
4835 | } | |
4836 | temp = temp1 ? savestring (temp1) : (char *)NULL; | |
4837 | break; | |
4838 | ||
4839 | /* $$ -- pid of the invoking shell. */ | |
4840 | case '$': | |
4841 | temp = itos (dollar_dollar_pid); | |
4842 | break; | |
4843 | ||
4844 | /* $# -- number of positional parameters. */ | |
4845 | case '#': | |
4846 | temp = itos (number_of_args ()); | |
4847 | break; | |
4848 | ||
4849 | /* $? -- return value of the last synchronous command. */ | |
4850 | case '?': | |
4851 | temp = itos (last_command_exit_value); | |
4852 | break; | |
4853 | ||
4854 | /* $- -- flags supplied to the shell on invocation or by `set'. */ | |
4855 | case '-': | |
4856 | temp = which_set_flags (); | |
4857 | break; | |
4858 | ||
4859 | /* $! -- Pid of the last asynchronous command. */ | |
4860 | case '!': | |
4861 | /* If no asynchronous pids have been created, expand to nothing. | |
4862 | If `set -u' has been executed, and no async processes have | |
4863 | been created, this is an expansion error. */ | |
4864 | if (last_asynchronous_pid == NO_PID) | |
4865 | { | |
4866 | if (expanded_something) | |
4867 | *expanded_something = 0; | |
4868 | temp = (char *)NULL; | |
4869 | if (unbound_vars_is_error) | |
4870 | { | |
4871 | report_error ("$%c: unbound variable", c); | |
4872 | last_command_exit_value = EXECUTION_FAILURE; | |
4873 | return (interactive_shell ? &expand_param_error : &expand_param_fatal); | |
4874 | } | |
4875 | } | |
4876 | else | |
4877 | temp = itos ((int)last_asynchronous_pid); | |
4878 | break; | |
4879 | ||
4880 | /* The only difference between this and $@ is when the arg is quoted. */ | |
4881 | case '*': /* `$*' */ | |
4882 | list = list_rest_of_args (); | |
4883 | ||
4884 | /* If there are no command-line arguments, this should just | |
4885 | disappear if there are other characters in the expansion, | |
4886 | even if it's quoted. */ | |
4887 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && list == 0) | |
4888 | temp = (char *)NULL; | |
4889 | else if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
4890 | { | |
4891 | /* If we have "$*" we want to make a string of the positional | |
4892 | parameters, separated by the first character of $IFS, and | |
4893 | quote the whole string, including the separators. If IFS | |
4894 | is unset, the parameters are separated by ' '; if $IFS is | |
4895 | null, the parameters are concatenated. */ | |
4896 | temp = string_list_dollar_star (list); | |
4897 | temp1 = quote_string (temp); | |
4898 | free (temp); | |
4899 | temp = temp1; | |
4900 | } | |
4901 | else | |
4902 | { | |
4903 | /* If the $* is not quoted it is identical to $@ */ | |
4904 | temp = string_list_dollar_at (list, quoted); | |
4905 | if (contains_dollar_at) | |
4906 | *contains_dollar_at = 1; | |
4907 | } | |
4908 | ||
4909 | dispose_words (list); | |
4910 | break; | |
4911 | ||
4912 | /* When we have "$@" what we want is "$1" "$2" "$3" ... This | |
4913 | means that we have to turn quoting off after we split into | |
4914 | the individually quoted arguments so that the final split | |
4915 | on the first character of $IFS is still done. */ | |
4916 | case '@': /* `$@' */ | |
4917 | list = list_rest_of_args (); | |
4918 | ||
4919 | /* We want to flag the fact that we saw this. We can't turn | |
4920 | off quoting entirely, because other characters in the | |
4921 | string might need it (consider "\"$@\""), but we need some | |
4922 | way to signal that the final split on the first character | |
4923 | of $IFS should be done, even though QUOTED is 1. */ | |
4924 | if (quoted_dollar_at_p && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) | |
4925 | *quoted_dollar_at_p = 1; | |
4926 | if (contains_dollar_at) | |
4927 | *contains_dollar_at = 1; | |
4928 | ||
4929 | /* We want to separate the positional parameters with the first | |
4930 | character of $IFS in case $IFS is something other than a space. | |
4931 | We also want to make sure that splitting is done no matter what -- | |
4932 | according to POSIX.2, this expands to a list of the positional | |
4933 | parameters no matter what IFS is set to. */ | |
4934 | temp = string_list_dollar_at (list, quoted); | |
4935 | ||
4936 | dispose_words (list); | |
4937 | break; | |
4938 | ||
4939 | case LBRACE: | |
4940 | temp = parameter_brace_expand (string, &zindex, quoted, | |
4941 | quoted_dollar_at_p, | |
4942 | contains_dollar_at); | |
4943 | if (temp == &expand_param_error || temp == &expand_param_fatal) | |
4944 | return (temp); | |
4945 | ||
4946 | /* XXX */ | |
bb70624e | 4947 | /* Quoted nulls should be removed if there is anything else |
cce855bc JA |
4948 | in the string. */ |
4949 | /* Note that we saw the quoted null so we can add one back at | |
4950 | the end of this function if there are no other characters | |
4951 | in the string, discard TEMP, and go on. */ | |
4952 | if (temp && QUOTED_NULL (temp)) | |
4953 | { | |
4954 | if (had_quoted_null_p) | |
4955 | *had_quoted_null_p = 1; | |
4956 | free (temp); | |
4957 | temp = (char *)NULL; | |
4958 | } | |
4959 | ||
4960 | goto return0; | |
4961 | ||
4962 | /* Do command or arithmetic substitution. */ | |
4963 | case LPAREN: | |
4964 | /* We have to extract the contents of this paren substitution. */ | |
4965 | t_index = zindex + 1; | |
4966 | temp = extract_command_subst (string, &t_index); | |
4967 | zindex = t_index; | |
4968 | ||
4969 | /* For Posix.2-style `$(( ))' arithmetic substitution, | |
4970 | extract the expression and pass it to the evaluator. */ | |
4971 | if (temp && *temp == LPAREN) | |
4972 | { | |
4973 | char *temp2; | |
4974 | temp1 = temp + 1; | |
4975 | temp2 = savestring (temp1); | |
4976 | t_index = strlen (temp2) - 1; | |
4977 | ||
4978 | if (temp2[t_index] != RPAREN) | |
4979 | { | |
4980 | free (temp2); | |
4981 | goto comsub; | |
4982 | } | |
4983 | ||
4984 | /* Cut off ending `)' */ | |
4985 | temp2[t_index] = '\0'; | |
4986 | ||
4987 | /* Expand variables found inside the expression. */ | |
4988 | temp1 = maybe_expand_string (temp2, Q_DOUBLE_QUOTES, expand_string); | |
4989 | free (temp2); | |
4990 | ||
4991 | arithsub: | |
4992 | /* No error messages. */ | |
4993 | this_command_name = (char *)NULL; | |
4994 | number = evalexp (temp1, &expok); | |
4995 | free (temp); | |
4996 | free (temp1); | |
4997 | if (expok == 0) | |
4998 | { | |
4999 | if (interactive_shell == 0 && posixly_correct) | |
5000 | { | |
5001 | last_command_exit_value = EXECUTION_FAILURE; | |
5002 | return (&expand_param_fatal); | |
5003 | } | |
5004 | else | |
5005 | return (&expand_param_error); | |
5006 | } | |
5007 | temp = itos (number); | |
5008 | break; | |
5009 | } | |
5010 | ||
5011 | comsub: | |
5012 | temp1 = command_substitute (temp, quoted); | |
5013 | FREE (temp); | |
5014 | temp = temp1; | |
5015 | break; | |
5016 | ||
5017 | /* Do POSIX.2d9-style arithmetic substitution. This will probably go | |
5018 | away in a future bash release. */ | |
5019 | case '[': | |
bb70624e | 5020 | /* Extract the contents of this arithmetic substitution. */ |
cce855bc JA |
5021 | t_index = zindex + 1; |
5022 | temp = extract_arithmetic_subst (string, &t_index); | |
5023 | zindex = t_index; | |
5024 | ||
5025 | /* Do initial variable expansion. */ | |
5026 | temp1 = maybe_expand_string (temp, Q_DOUBLE_QUOTES, expand_string); | |
5027 | ||
5028 | goto arithsub; | |
5029 | ||
5030 | default: | |
5031 | /* Find the variable in VARIABLE_LIST. */ | |
5032 | temp = (char *)NULL; | |
5033 | ||
5034 | for (t_index = zindex; (c = string[zindex]) && legal_variable_char (c); zindex++) | |
5035 | ; | |
5036 | temp1 = (zindex > t_index) ? substring (string, t_index, zindex) : (char *)NULL; | |
5037 | ||
5038 | /* If this isn't a variable name, then just output the `$'. */ | |
5039 | if (temp1 == 0 || *temp1 == '\0') | |
5040 | { | |
5041 | FREE (temp1); | |
5042 | temp = xmalloc (2); | |
5043 | temp[0] = '$'; | |
5044 | temp[1] = '\0'; | |
5045 | if (expanded_something) | |
5046 | *expanded_something = 0; | |
5047 | goto return0; | |
5048 | } | |
5049 | ||
5050 | /* If the variable exists, return its value cell. */ | |
5051 | var = find_variable (temp1); | |
5052 | ||
5053 | if (var && invisible_p (var) == 0 && value_cell (var)) | |
5054 | { | |
5055 | #if defined (ARRAY_VARS) | |
5056 | if (array_p (var)) | |
5057 | { | |
5058 | temp = array_reference (array_cell (var), 0); | |
5059 | if (temp) | |
5060 | temp = quote_escapes (temp); | |
5061 | } | |
5062 | else | |
5063 | #endif | |
5064 | temp = quote_escapes (value_cell (var)); | |
5065 | free (temp1); | |
5066 | if (tempvar_p (var)) /* XXX */ | |
5067 | { | |
5068 | dispose_variable (var); /* XXX */ | |
5069 | var = (SHELL_VAR *)NULL; | |
5070 | } | |
5071 | goto return0; | |
5072 | } | |
5073 | ||
5074 | temp = (char *)NULL; | |
5075 | ||
5076 | if (unbound_vars_is_error) | |
5077 | report_error ("%s: unbound variable", temp1); | |
5078 | else | |
5079 | { | |
5080 | free (temp1); | |
5081 | goto return0; | |
5082 | } | |
5083 | ||
5084 | free (temp1); | |
5085 | last_command_exit_value = EXECUTION_FAILURE; | |
5086 | return ((unbound_vars_is_error && interactive_shell == 0) | |
5087 | ? &expand_param_fatal | |
5088 | : &expand_param_error); | |
5089 | } | |
5090 | ||
5091 | if (string[zindex]) | |
5092 | zindex++; | |
5093 | ||
5094 | return0: | |
5095 | *sindex = zindex; | |
5096 | return (temp); | |
5097 | } | |
5098 | ||
5099 | /* Make a word list which is the result of parameter and variable | |
5100 | expansion, command substitution, arithmetic substitution, and | |
5101 | quote removal of WORD. Return a pointer to a WORD_LIST which is | |
5102 | the result of the expansion. If WORD contains a null word, the | |
5103 | word list returned is also null. | |
726f6388 | 5104 | |
ccc6cda3 JA |
5105 | QUOTED contains flag values defined in shell.h. |
5106 | ||
b72432fd JA |
5107 | ISEXP is used to tell expand_word_internal that the word should be |
5108 | treated as the result of an expansion. This has implications for | |
5109 | how IFS characters in the word are treated. | |
5110 | ||
726f6388 JA |
5111 | CONTAINS_DOLLAR_AT and EXPANDED_SOMETHING are return values; when non-null |
5112 | they point to an integer value which receives information about expansion. | |
5113 | CONTAINS_DOLLAR_AT gets non-zero if WORD contained "$@", else zero. | |
5114 | EXPANDED_SOMETHING get non-zero if WORD contained any parameter expansions, | |
5115 | else zero. | |
5116 | ||
5117 | This only does word splitting in the case of $@ expansion. In that | |
5118 | case, we split on ' '. */ | |
5119 | ||
5120 | /* Values for the local variable quoted_state. */ | |
5121 | #define UNQUOTED 0 | |
5122 | #define PARTIALLY_QUOTED 1 | |
5123 | #define WHOLLY_QUOTED 2 | |
5124 | ||
5125 | static WORD_LIST * | |
b72432fd | 5126 | expand_word_internal (word, quoted, isexp, contains_dollar_at, expanded_something) |
726f6388 | 5127 | WORD_DESC *word; |
b72432fd | 5128 | int quoted, isexp; |
726f6388 JA |
5129 | int *contains_dollar_at; |
5130 | int *expanded_something; | |
5131 | { | |
ccc6cda3 JA |
5132 | WORD_LIST *list; |
5133 | WORD_DESC *tword; | |
5134 | SHELL_VAR *var; | |
726f6388 JA |
5135 | |
5136 | /* The intermediate string that we build while expanding. */ | |
ccc6cda3 | 5137 | char *istring; |
726f6388 JA |
5138 | |
5139 | /* The current size of the above object. */ | |
ccc6cda3 | 5140 | int istring_size; |
726f6388 JA |
5141 | |
5142 | /* Index into ISTRING. */ | |
ccc6cda3 | 5143 | int istring_index; |
726f6388 JA |
5144 | |
5145 | /* Temporary string storage. */ | |
ccc6cda3 | 5146 | char *temp, *temp1; |
726f6388 JA |
5147 | |
5148 | /* The text of WORD. */ | |
ccc6cda3 | 5149 | register char *string; |
726f6388 JA |
5150 | |
5151 | /* The index into STRING. */ | |
ccc6cda3 | 5152 | int sindex; |
726f6388 JA |
5153 | |
5154 | /* This gets 1 if we see a $@ while quoted. */ | |
ccc6cda3 | 5155 | int quoted_dollar_at; |
726f6388 JA |
5156 | |
5157 | /* One of UNQUOTED, PARTIALLY_QUOTED, or WHOLLY_QUOTED, depending on | |
5158 | whether WORD contains no quoting characters, a partially quoted | |
5159 | string (e.g., "xx"ab), or is fully quoted (e.g., "xxab"). */ | |
ccc6cda3 JA |
5160 | int quoted_state; |
5161 | ||
5162 | int had_quoted_null; | |
cce855bc | 5163 | int has_dollar_at; |
726f6388 JA |
5164 | |
5165 | register int c; /* Current character. */ | |
5166 | int number; /* Temporary number value. */ | |
5167 | int t_index; /* For calls to string_extract_xxx. */ | |
726f6388 | 5168 | |
b72432fd | 5169 | char ifscmap[256]; |
bb70624e | 5170 | char twochars[2]; |
b72432fd | 5171 | |
d166f048 | 5172 | istring = xmalloc (istring_size = DEFAULT_INITIAL_ARRAY_SIZE); |
ccc6cda3 | 5173 | istring[istring_index = 0] = '\0'; |
cce855bc | 5174 | quoted_dollar_at = had_quoted_null = has_dollar_at = 0; |
ccc6cda3 JA |
5175 | quoted_state = UNQUOTED; |
5176 | ||
5177 | string = word->word; | |
5178 | if (string == 0) | |
5179 | goto finished_with_string; | |
726f6388 JA |
5180 | |
5181 | if (contains_dollar_at) | |
5182 | *contains_dollar_at = 0; | |
5183 | ||
b72432fd JA |
5184 | /* Cache a bitmap of characters in IFS for quoting IFS characters that are |
5185 | not part of an expansion. POSIX.2 says this is a must. */ | |
5186 | temp = getifs (); | |
5187 | bzero (ifscmap, sizeof (ifscmap)); | |
5188 | for (temp1 = temp; temp1 && *temp1; temp1++) | |
5189 | #if 0 | |
5190 | /* This check compensates for what I think is a parsing problem -- the | |
5191 | end brace matching algorithms for ${...} expressions differ between | |
5192 | parse.y and subst.c. For instance, the parser passes | |
5193 | ${abc:-G { I } K } as one word when it should be three. */ | |
5194 | if (*temp1 != ' ' && *temp1 != '\t' && *temp1 != '\n') | |
5195 | #endif | |
bb70624e | 5196 | ifscmap[(unsigned char)*temp1] = 1; |
b72432fd | 5197 | |
726f6388 JA |
5198 | /* Begin the expansion. */ |
5199 | ||
ccc6cda3 | 5200 | for (sindex = 0; ;) |
726f6388 JA |
5201 | { |
5202 | c = string[sindex]; | |
5203 | ||
5204 | /* Case on toplevel character. */ | |
5205 | switch (c) | |
5206 | { | |
5207 | case '\0': | |
5208 | goto finished_with_string; | |
5209 | ||
5210 | case CTLESC: | |
5211 | temp = xmalloc (3); | |
5212 | temp[0] = CTLESC; | |
5213 | temp[1] = c = string[++sindex]; | |
5214 | temp[2] = '\0'; | |
5215 | ||
cce855bc | 5216 | dollar_add_string: |
726f6388 JA |
5217 | if (string[sindex]) |
5218 | sindex++; | |
5219 | ||
cce855bc JA |
5220 | add_string: |
5221 | if (temp) | |
5222 | { | |
5223 | istring = sub_append_string (temp, istring, &istring_index, &istring_size); | |
5224 | temp = (char *)0; | |
5225 | } | |
5226 | ||
5227 | break; | |
726f6388 JA |
5228 | |
5229 | #if defined (PROCESS_SUBSTITUTION) | |
5230 | /* Process substitution. */ | |
5231 | case '<': | |
5232 | case '>': | |
5233 | { | |
cce855bc | 5234 | if (string[++sindex] != LPAREN || (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || posixly_correct) |
726f6388 | 5235 | { |
bb70624e | 5236 | sindex--; /* add_character: label increments sindex */ |
726f6388 JA |
5237 | goto add_character; |
5238 | } | |
5239 | else | |
cce855bc | 5240 | t_index = sindex + 1; /* skip past both '<' and LPAREN */ |
726f6388 | 5241 | |
cce855bc | 5242 | temp1 = extract_process_subst (string, (c == '<') ? "<(" : ">(", &t_index); /*))*/ |
ccc6cda3 | 5243 | sindex = t_index; |
726f6388 JA |
5244 | |
5245 | /* If the process substitution specification is `<()', we want to | |
5246 | open the pipe for writing in the child and produce output; if | |
5247 | it is `>()', we want to open the pipe for reading in the child | |
5248 | and consume input. */ | |
ccc6cda3 | 5249 | temp = temp1 ? process_substitute (temp1, (c == '>')) : (char *)0; |
726f6388 JA |
5250 | |
5251 | FREE (temp1); | |
5252 | ||
5253 | goto dollar_add_string; | |
5254 | } | |
5255 | #endif /* PROCESS_SUBSTITUTION */ | |
5256 | ||
726f6388 | 5257 | case '$': |
726f6388 JA |
5258 | if (expanded_something) |
5259 | *expanded_something = 1; | |
5260 | ||
cce855bc JA |
5261 | has_dollar_at = 0; |
5262 | temp = param_expand (string, &sindex, quoted, expanded_something, | |
5263 | &has_dollar_at, "ed_dollar_at, | |
5264 | &had_quoted_null, 0); | |
726f6388 | 5265 | |
cce855bc | 5266 | if (temp == &expand_param_error || temp == &expand_param_fatal) |
726f6388 | 5267 | { |
cce855bc JA |
5268 | free (string); |
5269 | free (istring); | |
5270 | return ((temp == &expand_param_error) ? &expand_word_error | |
5271 | : &expand_word_fatal); | |
5272 | } | |
5273 | if (contains_dollar_at && has_dollar_at) | |
5274 | *contains_dollar_at = 1; | |
5275 | goto add_string; | |
5276 | break; | |
726f6388 | 5277 | |
cce855bc JA |
5278 | case '`': /* Backquoted command substitution. */ |
5279 | { | |
5280 | sindex++; | |
726f6388 | 5281 | |
cce855bc JA |
5282 | if (expanded_something) |
5283 | *expanded_something = 1; | |
726f6388 | 5284 | |
cce855bc JA |
5285 | temp = string_extract (string, &sindex, "`", 0); |
5286 | de_backslash (temp); | |
5287 | temp1 = command_substitute (temp, quoted); | |
5288 | FREE (temp); | |
5289 | temp = temp1; | |
5290 | goto dollar_add_string; | |
5291 | } | |
ccc6cda3 | 5292 | |
cce855bc JA |
5293 | case '\\': |
5294 | if (string[sindex + 1] == '\n') | |
5295 | { | |
5296 | sindex += 2; | |
5297 | continue; | |
5298 | } | |
726f6388 | 5299 | |
cce855bc | 5300 | c = string[++sindex]; |
726f6388 | 5301 | |
cce855bc JA |
5302 | if (quoted & Q_HERE_DOCUMENT) |
5303 | temp1 = slashify_in_here_document; | |
5304 | else if (quoted & Q_DOUBLE_QUOTES) | |
5305 | temp1 = slashify_in_quotes; | |
5306 | else | |
5307 | temp1 = ""; | |
726f6388 | 5308 | |
cce855bc JA |
5309 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && member (c, temp1) == 0) |
5310 | { | |
bb70624e JA |
5311 | twochars[0] = '\\'; |
5312 | twochars[1] = c; | |
5313 | } | |
5314 | else if (c == 0) | |
5315 | { | |
5316 | c = CTLNUL; | |
5317 | sindex--; /* add_character: label increments sindex */ | |
5318 | goto add_character; | |
cce855bc JA |
5319 | } |
5320 | else | |
bb70624e JA |
5321 | { |
5322 | twochars[0] = CTLESC; | |
5323 | twochars[1] = c; | |
5324 | } | |
726f6388 | 5325 | |
bb70624e JA |
5326 | sindex++; |
5327 | add_twochars: | |
5328 | /* BEFORE jumping here, we need to increment sindex if appropriate */ | |
5329 | RESIZE_MALLOCED_BUFFER (istring, istring_index, 2, istring_size, | |
5330 | DEFAULT_ARRAY_SIZE); | |
5331 | istring[istring_index++] = twochars[0]; | |
5332 | istring[istring_index++] = twochars[1]; | |
5333 | istring[istring_index] = '\0'; | |
5334 | ||
5335 | break; | |
726f6388 | 5336 | |
cce855bc JA |
5337 | case '"': |
5338 | if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT|Q_NOQUOTE)) | |
5339 | goto add_character; | |
ccc6cda3 JA |
5340 | |
5341 | t_index = ++sindex; | |
5342 | temp = string_extract_double_quoted (string, &sindex, 0); | |
5343 | ||
5344 | /* If the quotes surrounded the entire string, then the | |
5345 | whole word was quoted. */ | |
5346 | quoted_state = (t_index == 1 && string[sindex] == '\0') | |
5347 | ? WHOLLY_QUOTED | |
5348 | : PARTIALLY_QUOTED; | |
5349 | ||
5350 | if (temp && *temp) | |
726f6388 | 5351 | { |
ccc6cda3 JA |
5352 | tword = make_word (temp); /* XXX */ |
5353 | free (temp); | |
5354 | temp = (char *)NULL; | |
5355 | ||
cce855bc | 5356 | has_dollar_at = 0; |
b72432fd | 5357 | list = expand_word_internal (tword, Q_DOUBLE_QUOTES, 0, &has_dollar_at, (int *)NULL); |
726f6388 | 5358 | |
ccc6cda3 JA |
5359 | if (list == &expand_word_error || list == &expand_word_fatal) |
5360 | { | |
5361 | free (istring); | |
5362 | free (string); | |
5363 | /* expand_word_internal has already freed temp_word->word | |
5364 | for us because of the way it prints error messages. */ | |
5365 | tword->word = (char *)NULL; | |
5366 | dispose_word (tword); | |
5367 | return list; | |
5368 | } | |
726f6388 | 5369 | |
ccc6cda3 | 5370 | dispose_word (tword); |
726f6388 | 5371 | |
ccc6cda3 JA |
5372 | /* "$@" (a double-quoted dollar-at) expands into nothing, |
5373 | not even a NULL word, when there are no positional | |
5374 | parameters. */ | |
cce855bc | 5375 | if (list == 0 && has_dollar_at) |
726f6388 | 5376 | { |
ccc6cda3 JA |
5377 | quoted_dollar_at++; |
5378 | break; | |
5379 | } | |
5380 | ||
5381 | /* If we get "$@", we know we have expanded something, so we | |
5382 | need to remember it for the final split on $IFS. This is | |
5383 | a special case; it's the only case where a quoted string | |
5384 | can expand into more than one word. It's going to come back | |
5385 | from the above call to expand_word_internal as a list with | |
5386 | a single word, in which all characters are quoted and | |
5387 | separated by blanks. What we want to do is to turn it back | |
5388 | into a list for the next piece of code. */ | |
5389 | if (list) | |
5390 | dequote_list (list); | |
5391 | ||
cce855bc | 5392 | if (has_dollar_at) |
ccc6cda3 JA |
5393 | { |
5394 | quoted_dollar_at++; | |
5395 | if (contains_dollar_at) | |
5396 | *contains_dollar_at = 1; | |
5397 | if (expanded_something) | |
5398 | *expanded_something = 1; | |
5399 | } | |
5400 | } | |
5401 | else | |
5402 | { | |
5403 | /* What we have is "". This is a minor optimization. */ | |
5404 | free (temp); | |
5405 | list = (WORD_LIST *)NULL; | |
5406 | } | |
5407 | ||
5408 | /* The code above *might* return a list (consider the case of "$@", | |
5409 | where it returns "$1", "$2", etc.). We can't throw away the | |
5410 | rest of the list, and we have to make sure each word gets added | |
5411 | as quoted. We test on tresult->next: if it is non-NULL, we | |
5412 | quote the whole list, save it to a string with string_list, and | |
5413 | add that string. We don't need to quote the results of this | |
5414 | (and it would be wrong, since that would quote the separators | |
5415 | as well), so we go directly to add_string. */ | |
5416 | if (list) | |
5417 | { | |
5418 | if (list->next) | |
5419 | { | |
bc4cd23c JA |
5420 | /* Testing quoted_dollar_at makes sure that "$@" is |
5421 | split correctly when $IFS does not contain a space. */ | |
5422 | temp = quoted_dollar_at | |
5423 | ? string_list_dollar_at (list, Q_DOUBLE_QUOTES) | |
5424 | : string_list (quote_list (list)); | |
ccc6cda3 | 5425 | dispose_words (list); |
726f6388 JA |
5426 | goto add_string; |
5427 | } | |
5428 | else | |
5429 | { | |
ccc6cda3 JA |
5430 | temp = savestring (list->word->word); |
5431 | dispose_words (list); | |
cce855bc JA |
5432 | #if 1 |
5433 | /* If the string is not a quoted null string, we want | |
5434 | to remove any embedded unquoted CTLNUL characters. | |
5435 | We do not want to turn quoted null strings back into | |
5436 | the empty string, though. We do this because we | |
5437 | want to remove any quoted nulls from expansions that | |
5438 | contain other characters. For example, if we have | |
5439 | x"$*"y or "x$*y" and there are no positional parameters, | |
5440 | the $* should expand into nothing. */ | |
5441 | if (QUOTED_NULL (temp) == 0) | |
5442 | remove_quoted_nulls (temp); /* XXX */ | |
5443 | #endif | |
726f6388 JA |
5444 | } |
5445 | } | |
ccc6cda3 JA |
5446 | else |
5447 | temp = (char *)NULL; | |
726f6388 | 5448 | |
ccc6cda3 JA |
5449 | /* We do not want to add quoted nulls to strings that are only |
5450 | partially quoted; we can throw them away. */ | |
5451 | if (temp == 0 && quoted_state == PARTIALLY_QUOTED) | |
cce855bc | 5452 | continue; |
726f6388 | 5453 | |
ccc6cda3 | 5454 | add_quoted_string: |
726f6388 | 5455 | |
ccc6cda3 JA |
5456 | if (temp) |
5457 | { | |
5458 | temp1 = temp; | |
5459 | temp = quote_string (temp); | |
5460 | free (temp1); | |
bb70624e | 5461 | goto add_string; |
ccc6cda3 JA |
5462 | } |
5463 | else | |
5464 | { | |
5465 | /* Add NULL arg. */ | |
bb70624e JA |
5466 | c = CTLNUL; |
5467 | sindex--; /* add_character: label increments sindex */ | |
5468 | goto add_character; | |
ccc6cda3 | 5469 | } |
bb70624e | 5470 | |
ccc6cda3 | 5471 | /* break; */ |
726f6388 | 5472 | |
ccc6cda3 JA |
5473 | case '\'': |
5474 | if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT|Q_NOQUOTE)) | |
5475 | goto add_character; | |
726f6388 | 5476 | |
ccc6cda3 JA |
5477 | t_index = ++sindex; |
5478 | temp = string_extract_single_quoted (string, &sindex); | |
726f6388 | 5479 | |
ccc6cda3 JA |
5480 | /* If the entire STRING was surrounded by single quotes, |
5481 | then the string is wholly quoted. */ | |
5482 | quoted_state = (t_index == 1 && string[sindex] == '\0') | |
5483 | ? WHOLLY_QUOTED | |
5484 | : PARTIALLY_QUOTED; | |
726f6388 | 5485 | |
ccc6cda3 JA |
5486 | /* If all we had was '', it is a null expansion. */ |
5487 | if (*temp == '\0') | |
5488 | { | |
5489 | free (temp); | |
5490 | temp = (char *)NULL; | |
5491 | } | |
5492 | else | |
5493 | remove_quoted_escapes (temp); | |
726f6388 | 5494 | |
ccc6cda3 JA |
5495 | /* We do not want to add quoted nulls to strings that are only |
5496 | partially quoted; such nulls are discarded. */ | |
5497 | if (temp == 0 && (quoted_state == PARTIALLY_QUOTED)) | |
5498 | continue; | |
726f6388 | 5499 | |
bb70624e JA |
5500 | /* If we have a quoted null expansion, add a quoted NULL to istring. */ |
5501 | if (temp == 0) | |
5502 | { | |
5503 | c = CTLNUL; | |
5504 | sindex--; /* add_character: label increments sindex */ | |
5505 | goto add_character; | |
5506 | } | |
5507 | else | |
5508 | goto add_quoted_string; | |
5509 | ||
ccc6cda3 | 5510 | /* break; */ |
726f6388 JA |
5511 | |
5512 | default: | |
726f6388 | 5513 | /* This is the fix for " $@ " */ |
b72432fd | 5514 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || (isexp == 0 && ifscmap[c])) |
726f6388 | 5515 | { |
bb70624e JA |
5516 | if (string[sindex]) /* from old goto dollar_add_string */ |
5517 | sindex++; | |
5518 | if (c == 0) | |
5519 | { | |
5520 | c = CTLNUL; | |
5521 | goto add_character; | |
5522 | } | |
5523 | else | |
5524 | { | |
5525 | twochars[0] = CTLESC; | |
5526 | twochars[1] = c; | |
5527 | goto add_twochars; | |
5528 | } | |
726f6388 JA |
5529 | } |
5530 | ||
5531 | add_character: | |
ccc6cda3 JA |
5532 | RESIZE_MALLOCED_BUFFER (istring, istring_index, 1, istring_size, |
5533 | DEFAULT_ARRAY_SIZE); | |
726f6388 JA |
5534 | istring[istring_index++] = c; |
5535 | istring[istring_index] = '\0'; | |
5536 | ||
5537 | /* Next character. */ | |
5538 | sindex++; | |
5539 | } | |
5540 | } | |
5541 | ||
5542 | finished_with_string: | |
726f6388 JA |
5543 | /* OK, we're ready to return. If we have a quoted string, and |
5544 | quoted_dollar_at is not set, we do no splitting at all; otherwise | |
5545 | we split on ' '. The routines that call this will handle what to | |
5546 | do if nothing has been expanded. */ | |
ccc6cda3 JA |
5547 | |
5548 | /* Partially and wholly quoted strings which expand to the empty | |
5549 | string are retained as an empty arguments. Unquoted strings | |
5550 | which expand to the empty string are discarded. The single | |
5551 | exception is the case of expanding "$@" when there are no | |
5552 | positional parameters. In that case, we discard the expansion. */ | |
5553 | ||
5554 | /* Because of how the code that handles "" and '' in partially | |
5555 | quoted strings works, we need to make ISTRING into a QUOTED_NULL | |
5556 | if we saw quoting characters, but the expansion was empty. | |
5557 | "" and '' are tossed away before we get to this point when | |
5558 | processing partially quoted strings. This makes "" and $xxx"" | |
5559 | equivalent when xxx is unset. We also look to see whether we | |
5560 | saw a quoted null from a ${} expansion and add one back if we | |
5561 | need to. */ | |
5562 | ||
5563 | /* If we expand to nothing and there were no single or double quotes | |
5564 | in the word, we throw it away. Otherwise, we return a NULL word. | |
5565 | The single exception is for $@ surrounded by double quotes when | |
5566 | there are no positional parameters. In that case, we also throw | |
5567 | the word away. */ | |
5568 | ||
5569 | if (*istring == '\0') | |
5570 | { | |
5571 | if (quoted_dollar_at == 0 && (had_quoted_null || quoted_state == PARTIALLY_QUOTED)) | |
726f6388 | 5572 | { |
726f6388 JA |
5573 | istring[0] = CTLNUL; |
5574 | istring[1] = '\0'; | |
ccc6cda3 JA |
5575 | tword = make_bare_word (istring); |
5576 | list = make_word_list (tword, (WORD_LIST *)NULL); | |
5577 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
5578 | tword->flags |= W_QUOTED; | |
726f6388 | 5579 | } |
ccc6cda3 JA |
5580 | /* According to sh, ksh, and Posix.2, if a word expands into nothing |
5581 | and a double-quoted "$@" appears anywhere in it, then the entire | |
5582 | word is removed. */ | |
5583 | else if (quoted_state == UNQUOTED || quoted_dollar_at) | |
5584 | list = (WORD_LIST *)NULL; | |
5585 | #if 0 | |
5586 | else | |
726f6388 | 5587 | { |
ccc6cda3 JA |
5588 | tword = make_bare_word (istring); |
5589 | list = make_word_list (tword, (WORD_LIST *)NULL); | |
5590 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
5591 | tword->flags |= W_QUOTED; | |
726f6388 | 5592 | } |
ccc6cda3 JA |
5593 | #endif |
5594 | } | |
5595 | else if (word->flags & W_NOSPLIT) | |
5596 | { | |
5597 | tword = make_bare_word (istring); | |
5598 | list = make_word_list (tword, (WORD_LIST *)NULL); | |
5599 | if (word->flags & W_ASSIGNMENT) | |
5600 | tword->flags |= W_ASSIGNMENT; /* XXX */ | |
b72432fd JA |
5601 | if (word->flags & W_NOGLOB) |
5602 | tword->flags |= W_NOGLOB; /* XXX */ | |
ccc6cda3 JA |
5603 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) |
5604 | tword->flags |= W_QUOTED; | |
5605 | } | |
5606 | else | |
5607 | { | |
5608 | char *ifs_chars; | |
5609 | ||
b72432fd | 5610 | ifs_chars = (quoted_dollar_at || has_dollar_at) ? getifs () : (char *)NULL; |
726f6388 | 5611 | |
cce855bc JA |
5612 | /* If we have $@, we need to split the results no matter what. If |
5613 | IFS is unset or NULL, string_list_dollar_at has separated the | |
5614 | positional parameters with a space, so we split on space (we have | |
5615 | set ifs_chars to " \t\n" above if ifs is unset). If IFS is set, | |
5616 | string_list_dollar_at has separated the positional parameters | |
5617 | with the first character of $IFS, so we split on $IFS. */ | |
5618 | if (has_dollar_at && ifs_chars) | |
5619 | list = list_string (istring, *ifs_chars ? ifs_chars : " ", 1); | |
ccc6cda3 JA |
5620 | else |
5621 | { | |
5622 | tword = make_bare_word (istring); | |
5623 | list = make_word_list (tword, (WORD_LIST *)NULL); | |
5624 | if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) || (quoted_state == WHOLLY_QUOTED)) | |
5625 | tword->flags |= W_QUOTED; | |
5626 | if (word->flags & W_ASSIGNMENT) | |
5627 | tword->flags |= W_ASSIGNMENT; | |
b72432fd JA |
5628 | if (word->flags & W_NOGLOB) |
5629 | tword->flags |= W_NOGLOB; | |
726f6388 | 5630 | } |
726f6388 | 5631 | } |
726f6388 | 5632 | |
ccc6cda3 JA |
5633 | free (istring); |
5634 | return (list); | |
726f6388 JA |
5635 | } |
5636 | ||
5637 | /* **************************************************************** */ | |
5638 | /* */ | |
5639 | /* Functions for Quote Removal */ | |
5640 | /* */ | |
5641 | /* **************************************************************** */ | |
5642 | ||
5643 | /* Perform quote removal on STRING. If QUOTED > 0, assume we are obeying the | |
5644 | backslash quoting rules for within double quotes. */ | |
5645 | char * | |
5646 | string_quote_removal (string, quoted) | |
5647 | char *string; | |
5648 | int quoted; | |
5649 | { | |
ccc6cda3 | 5650 | char *r, *result_string, *temp; |
726f6388 JA |
5651 | int sindex, tindex, c, dquote; |
5652 | ||
5653 | /* The result can be no longer than the original string. */ | |
5654 | r = result_string = xmalloc (strlen (string) + 1); | |
5655 | ||
ccc6cda3 | 5656 | for (dquote = sindex = 0; c = string[sindex];) |
726f6388 JA |
5657 | { |
5658 | switch (c) | |
5659 | { | |
5660 | case '\\': | |
5661 | c = string[++sindex]; | |
ccc6cda3 | 5662 | if (((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || dquote) && member (c, slashify_in_quotes) == 0) |
726f6388 | 5663 | *r++ = '\\'; |
ccc6cda3 | 5664 | /* FALLTHROUGH */ |
726f6388 JA |
5665 | |
5666 | default: | |
5667 | *r++ = c; | |
5668 | sindex++; | |
5669 | break; | |
5670 | ||
5671 | case '\'': | |
ccc6cda3 | 5672 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || dquote) |
726f6388 JA |
5673 | { |
5674 | *r++ = c; | |
5675 | sindex++; | |
ccc6cda3 | 5676 | break; |
726f6388 | 5677 | } |
ccc6cda3 JA |
5678 | tindex = sindex + 1; |
5679 | temp = string_extract_single_quoted (string, &tindex); | |
5680 | if (temp) | |
726f6388 | 5681 | { |
ccc6cda3 JA |
5682 | strcpy (r, temp); |
5683 | r += strlen (r); | |
5684 | free (temp); | |
726f6388 | 5685 | } |
ccc6cda3 | 5686 | sindex = tindex; |
726f6388 JA |
5687 | break; |
5688 | ||
5689 | case '"': | |
5690 | dquote = 1 - dquote; | |
5691 | sindex++; | |
5692 | break; | |
5693 | } | |
5694 | } | |
5695 | *r = '\0'; | |
5696 | return (result_string); | |
5697 | } | |
5698 | ||
ccc6cda3 JA |
5699 | #if 0 |
5700 | /* UNUSED */ | |
726f6388 JA |
5701 | /* Perform quote removal on word WORD. This allocates and returns a new |
5702 | WORD_DESC *. */ | |
5703 | WORD_DESC * | |
5704 | word_quote_removal (word, quoted) | |
5705 | WORD_DESC *word; | |
5706 | int quoted; | |
5707 | { | |
5708 | WORD_DESC *w; | |
5709 | char *t; | |
5710 | ||
5711 | t = string_quote_removal (word->word, quoted); | |
ccc6cda3 | 5712 | w = make_bare_word (t); |
d166f048 | 5713 | free (t); |
726f6388 JA |
5714 | return (w); |
5715 | } | |
5716 | ||
5717 | /* Perform quote removal on all words in LIST. If QUOTED is non-zero, | |
5718 | the members of the list are treated as if they are surrounded by | |
5719 | double quotes. Return a new list, or NULL if LIST is NULL. */ | |
5720 | WORD_LIST * | |
5721 | word_list_quote_removal (list, quoted) | |
5722 | WORD_LIST *list; | |
5723 | int quoted; | |
5724 | { | |
ccc6cda3 | 5725 | WORD_LIST *result, *t, *tresult; |
726f6388 | 5726 | |
ccc6cda3 | 5727 | for (t = list, result = (WORD_LIST *)NULL; t; t = t->next) |
726f6388 JA |
5728 | { |
5729 | tresult = (WORD_LIST *)xmalloc (sizeof (WORD_LIST)); | |
5730 | tresult->word = word_quote_removal (t->word, quoted); | |
5731 | tresult->next = (WORD_LIST *)NULL; | |
5732 | result = (WORD_LIST *) list_append (result, tresult); | |
726f6388 JA |
5733 | } |
5734 | return (result); | |
5735 | } | |
ccc6cda3 | 5736 | #endif |
726f6388 | 5737 | |
726f6388 JA |
5738 | /******************************************* |
5739 | * * | |
5740 | * Functions to perform word splitting * | |
5741 | * * | |
5742 | *******************************************/ | |
5743 | ||
b72432fd JA |
5744 | static char * |
5745 | getifs () | |
5746 | { | |
5747 | SHELL_VAR *ifs; | |
5748 | ||
5749 | ifs = find_variable ("IFS"); | |
5750 | /* If IFS is unset, it defaults to " \t\n". */ | |
5751 | return (ifs ? value_cell (ifs) : " \t\n"); | |
5752 | } | |
5753 | ||
726f6388 JA |
5754 | /* This splits a single word into a WORD LIST on $IFS, but only if the word |
5755 | is not quoted. list_string () performs quote removal for us, even if we | |
5756 | don't do any splitting. */ | |
5757 | WORD_LIST * | |
5758 | word_split (w) | |
5759 | WORD_DESC *w; | |
5760 | { | |
5761 | WORD_LIST *result; | |
ccc6cda3 JA |
5762 | SHELL_VAR *ifs; |
5763 | char *ifs_chars; | |
726f6388 JA |
5764 | |
5765 | if (w) | |
5766 | { | |
ccc6cda3 | 5767 | ifs = find_variable ("IFS"); |
726f6388 | 5768 | /* If IFS is unset, it defaults to " \t\n". */ |
ccc6cda3 | 5769 | ifs_chars = ifs ? value_cell (ifs) : " \t\n"; |
726f6388 | 5770 | |
ccc6cda3 | 5771 | if ((w->flags & W_QUOTED) || !ifs_chars) |
726f6388 JA |
5772 | ifs_chars = ""; |
5773 | ||
ccc6cda3 | 5774 | result = list_string (w->word, ifs_chars, w->flags & W_QUOTED); |
cce855bc JA |
5775 | |
5776 | if (ifs && tempvar_p (ifs)) /* XXX */ | |
5777 | dispose_variable (ifs); /* XXX */ | |
726f6388 JA |
5778 | } |
5779 | else | |
5780 | result = (WORD_LIST *)NULL; | |
ccc6cda3 | 5781 | |
726f6388 JA |
5782 | return (result); |
5783 | } | |
5784 | ||
5785 | /* Perform word splitting on LIST and return the RESULT. It is possible | |
5786 | to return (WORD_LIST *)NULL. */ | |
5787 | static WORD_LIST * | |
5788 | word_list_split (list) | |
5789 | WORD_LIST *list; | |
5790 | { | |
ccc6cda3 | 5791 | WORD_LIST *result, *t, *tresult; |
726f6388 | 5792 | |
ccc6cda3 | 5793 | for (t = list, result = (WORD_LIST *)NULL; t; t = t->next) |
726f6388 JA |
5794 | { |
5795 | tresult = word_split (t->word); | |
5796 | result = (WORD_LIST *) list_append (result, tresult); | |
726f6388 JA |
5797 | } |
5798 | return (result); | |
5799 | } | |
5800 | ||
5801 | /************************************************** | |
5802 | * * | |
cce855bc | 5803 | * Functions to expand an entire WORD_LIST * |
726f6388 JA |
5804 | * * |
5805 | **************************************************/ | |
5806 | ||
cce855bc JA |
5807 | /* Put NLIST (which is a WORD_LIST * of only one element) at the front of |
5808 | ELIST, and set ELIST to the new list. */ | |
5809 | #define PREPEND_LIST(nlist, elist) \ | |
5810 | do { nlist->next = elist; elist = nlist; } while (0) | |
5811 | ||
726f6388 JA |
5812 | /* Separate out any initial variable assignments from TLIST. If set -k has |
5813 | been executed, remove all assignment statements from TLIST. Initial | |
5814 | variable assignments and other environment assignments are placed | |
bb70624e | 5815 | on SUBST_ASSIGN_VARLIST. */ |
726f6388 JA |
5816 | static WORD_LIST * |
5817 | separate_out_assignments (tlist) | |
5818 | WORD_LIST *tlist; | |
5819 | { | |
5820 | register WORD_LIST *vp, *lp; | |
5821 | ||
5822 | if (!tlist) | |
5823 | return ((WORD_LIST *)NULL); | |
5824 | ||
bb70624e JA |
5825 | if (subst_assign_varlist) |
5826 | dispose_words (subst_assign_varlist); /* Clean up after previous error */ | |
b72432fd | 5827 | |
bb70624e | 5828 | subst_assign_varlist = (WORD_LIST *)NULL; |
726f6388 JA |
5829 | vp = lp = tlist; |
5830 | ||
5831 | /* Separate out variable assignments at the start of the command. | |
5832 | Loop invariant: vp->next == lp | |
5833 | Loop postcondition: | |
5834 | lp = list of words left after assignment statements skipped | |
5835 | tlist = original list of words | |
5836 | */ | |
ccc6cda3 | 5837 | while (lp && (lp->word->flags & W_ASSIGNMENT)) |
726f6388 JA |
5838 | { |
5839 | vp = lp; | |
5840 | lp = lp->next; | |
5841 | } | |
5842 | ||
bb70624e JA |
5843 | /* If lp != tlist, we have some initial assignment statements. |
5844 | We make SUBST_ASSIGN_VARLIST point to the list of assignment | |
5845 | words and TLIST point to the remaining words. */ | |
726f6388 JA |
5846 | if (lp != tlist) |
5847 | { | |
bb70624e | 5848 | subst_assign_varlist = tlist; |
726f6388 JA |
5849 | /* ASSERT(vp->next == lp); */ |
5850 | vp->next = (WORD_LIST *)NULL; /* terminate variable list */ | |
5851 | tlist = lp; /* remainder of word list */ | |
5852 | } | |
5853 | ||
5854 | /* vp == end of variable list */ | |
5855 | /* tlist == remainder of original word list without variable assignments */ | |
5856 | if (!tlist) | |
5857 | /* All the words in tlist were assignment statements */ | |
5858 | return ((WORD_LIST *)NULL); | |
5859 | ||
5860 | /* ASSERT(tlist != NULL); */ | |
ccc6cda3 | 5861 | /* ASSERT((tlist->word->flags & W_ASSIGNMENT) == 0); */ |
726f6388 JA |
5862 | |
5863 | /* If the -k option is in effect, we need to go through the remaining | |
bb70624e JA |
5864 | words, separate out the assignment words, and place them on |
5865 | SUBST_ASSIGN_VARLIST. */ | |
726f6388 JA |
5866 | if (place_keywords_in_env) |
5867 | { | |
5868 | WORD_LIST *tp; /* tp == running pointer into tlist */ | |
5869 | ||
5870 | tp = tlist; | |
5871 | lp = tlist->next; | |
5872 | ||
5873 | /* Loop Invariant: tp->next == lp */ | |
5874 | /* Loop postcondition: tlist == word list without assignment statements */ | |
5875 | while (lp) | |
5876 | { | |
ccc6cda3 | 5877 | if (lp->word->flags & W_ASSIGNMENT) |
726f6388 JA |
5878 | { |
5879 | /* Found an assignment statement, add this word to end of | |
bb70624e JA |
5880 | subst_assign_varlist (vp). */ |
5881 | if (!subst_assign_varlist) | |
5882 | subst_assign_varlist = vp = lp; | |
726f6388 JA |
5883 | else |
5884 | { | |
5885 | vp->next = lp; | |
5886 | vp = lp; | |
5887 | } | |
5888 | ||
5889 | /* Remove the word pointed to by LP from TLIST. */ | |
5890 | tp->next = lp->next; | |
5891 | /* ASSERT(vp == lp); */ | |
5892 | lp->next = (WORD_LIST *)NULL; | |
5893 | lp = tp->next; | |
5894 | } | |
5895 | else | |
5896 | { | |
5897 | tp = lp; | |
5898 | lp = lp->next; | |
5899 | } | |
5900 | } | |
5901 | } | |
5902 | return (tlist); | |
5903 | } | |
5904 | ||
cce855bc JA |
5905 | #define WEXP_VARASSIGN 0x001 |
5906 | #define WEXP_BRACEEXP 0x002 | |
5907 | #define WEXP_TILDEEXP 0x004 | |
5908 | #define WEXP_PARAMEXP 0x008 | |
5909 | #define WEXP_PATHEXP 0x010 | |
5910 | ||
5911 | /* All of the expansions, including variable assignments at the start of | |
5912 | the list. */ | |
5913 | #define WEXP_ALL (WEXP_VARASSIGN|WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP|WEXP_PATHEXP) | |
5914 | ||
5915 | /* All of the expansions except variable assignments at the start of | |
5916 | the list. */ | |
5917 | #define WEXP_NOVARS (WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP|WEXP_PATHEXP) | |
5918 | ||
5919 | /* All of the `shell expansions': brace expansion, tilde expansion, parameter | |
5920 | expansion, command substitution, arithmetic expansion, word splitting, and | |
5921 | quote removal. */ | |
5922 | #define WEXP_SHELLEXP (WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP) | |
5923 | ||
726f6388 JA |
5924 | /* Take the list of words in LIST and do the various substitutions. Return |
5925 | a new list of words which is the expanded list, and without things like | |
5926 | variable assignments. */ | |
5927 | ||
5928 | WORD_LIST * | |
5929 | expand_words (list) | |
5930 | WORD_LIST *list; | |
5931 | { | |
cce855bc | 5932 | return (expand_word_list_internal (list, WEXP_ALL)); |
726f6388 JA |
5933 | } |
5934 | ||
5935 | /* Same as expand_words (), but doesn't hack variable or environment | |
5936 | variables. */ | |
5937 | WORD_LIST * | |
5938 | expand_words_no_vars (list) | |
5939 | WORD_LIST *list; | |
5940 | { | |
cce855bc | 5941 | return (expand_word_list_internal (list, WEXP_NOVARS)); |
726f6388 JA |
5942 | } |
5943 | ||
cce855bc JA |
5944 | WORD_LIST * |
5945 | expand_words_shellexp (list) | |
726f6388 | 5946 | WORD_LIST *list; |
726f6388 | 5947 | { |
cce855bc JA |
5948 | return (expand_word_list_internal (list, WEXP_SHELLEXP)); |
5949 | } | |
726f6388 | 5950 | |
cce855bc JA |
5951 | static WORD_LIST * |
5952 | glob_expand_word_list (tlist, eflags) | |
5953 | WORD_LIST *tlist; | |
5954 | int eflags; | |
5955 | { | |
5956 | char **glob_array, *temp_string; | |
5957 | register int glob_index; | |
5958 | WORD_LIST *glob_list, *output_list, *disposables, *next; | |
5959 | WORD_DESC *tword; | |
726f6388 | 5960 | |
cce855bc JA |
5961 | output_list = disposables = (WORD_LIST *)NULL; |
5962 | glob_array = (char **)NULL; | |
5963 | while (tlist) | |
5964 | { | |
5965 | /* For each word, either globbing is attempted or the word is | |
5966 | added to orig_list. If globbing succeeds, the results are | |
5967 | added to orig_list and the word (tlist) is added to the list | |
5968 | of disposable words. If globbing fails and failed glob | |
5969 | expansions are left unchanged (the shell default), the | |
5970 | original word is added to orig_list. If globbing fails and | |
5971 | failed glob expansions are removed, the original word is | |
5972 | added to the list of disposable words. orig_list ends up | |
5973 | in reverse order and requires a call to reverse_list to | |
5974 | be set right. After all words are examined, the disposable | |
5975 | words are freed. */ | |
5976 | next = tlist->next; | |
726f6388 | 5977 | |
cce855bc JA |
5978 | /* If the word isn't an assignment and contains an unquoted |
5979 | pattern matching character, then glob it. */ | |
b72432fd | 5980 | #if 0 |
cce855bc | 5981 | if ((tlist->word->flags & W_ASSIGNMENT) == 0 && |
b72432fd JA |
5982 | #else |
5983 | if ((tlist->word->flags & W_NOGLOB) == 0 && | |
5984 | #endif | |
cce855bc | 5985 | unquoted_glob_pattern_p (tlist->word->word)) |
726f6388 | 5986 | { |
cce855bc JA |
5987 | glob_array = shell_glob_filename (tlist->word->word); |
5988 | ||
5989 | /* Handle error cases. | |
5990 | I don't think we should report errors like "No such file | |
5991 | or directory". However, I would like to report errors | |
5992 | like "Read failed". */ | |
5993 | ||
5994 | if (GLOB_FAILED (glob_array)) | |
726f6388 | 5995 | { |
bb70624e | 5996 | glob_array = (char **)xmalloc (sizeof (char *)); |
cce855bc JA |
5997 | glob_array[0] = (char *)NULL; |
5998 | } | |
5999 | ||
6000 | /* Dequote the current word in case we have to use it. */ | |
6001 | if (glob_array[0] == NULL) | |
6002 | { | |
6003 | temp_string = dequote_string (tlist->word->word); | |
6004 | free (tlist->word->word); | |
6005 | tlist->word->word = temp_string; | |
6006 | } | |
6007 | ||
6008 | /* Make the array into a word list. */ | |
6009 | glob_list = (WORD_LIST *)NULL; | |
6010 | for (glob_index = 0; glob_array[glob_index]; glob_index++) | |
6011 | { | |
6012 | tword = make_bare_word (glob_array[glob_index]); | |
6013 | tword->flags |= W_GLOBEXP; /* XXX */ | |
6014 | glob_list = make_word_list (tword, glob_list); | |
6015 | } | |
6016 | ||
6017 | if (glob_list) | |
6018 | { | |
6019 | output_list = (WORD_LIST *)list_append (glob_list, output_list); | |
6020 | PREPEND_LIST (tlist, disposables); | |
6021 | } | |
6022 | else if (allow_null_glob_expansion == 0) | |
6023 | { | |
6024 | /* Failed glob expressions are left unchanged. */ | |
6025 | PREPEND_LIST (tlist, output_list); | |
6026 | } | |
6027 | else | |
6028 | { | |
6029 | /* Failed glob expressions are removed. */ | |
6030 | PREPEND_LIST (tlist, disposables); | |
726f6388 | 6031 | } |
726f6388 | 6032 | } |
cce855bc JA |
6033 | else |
6034 | { | |
6035 | /* Dequote the string. */ | |
6036 | temp_string = dequote_string (tlist->word->word); | |
6037 | free (tlist->word->word); | |
6038 | tlist->word->word = temp_string; | |
6039 | PREPEND_LIST (tlist, output_list); | |
6040 | } | |
6041 | ||
6042 | free_array (glob_array); | |
6043 | glob_array = (char **)NULL; | |
6044 | ||
6045 | tlist = next; | |
726f6388 JA |
6046 | } |
6047 | ||
cce855bc JA |
6048 | if (disposables) |
6049 | dispose_words (disposables); | |
6050 | ||
6051 | if (output_list) | |
6052 | output_list = REVERSE_LIST (output_list, WORD_LIST *); | |
6053 | ||
6054 | return (output_list); | |
6055 | } | |
726f6388 JA |
6056 | |
6057 | #if defined (BRACE_EXPANSION) | |
cce855bc JA |
6058 | static WORD_LIST * |
6059 | brace_expand_word_list (tlist, eflags) | |
6060 | WORD_LIST *tlist; | |
6061 | int eflags; | |
6062 | { | |
6063 | register char **expansions; | |
6064 | char *temp_string; | |
6065 | WORD_LIST *disposables, *output_list, *next; | |
6066 | WORD_DESC *w; | |
6067 | int eindex; | |
6068 | ||
6069 | for (disposables = output_list = (WORD_LIST *)NULL; tlist; tlist = next) | |
726f6388 | 6070 | { |
cce855bc | 6071 | next = tlist->next; |
726f6388 | 6072 | |
cce855bc JA |
6073 | /* Only do brace expansion if the word has a brace character. If |
6074 | not, just add the word list element to BRACES and continue. In | |
6075 | the common case, at least when running shell scripts, this will | |
6076 | degenerate to a bunch of calls to `strchr', and then what is | |
6077 | basically a reversal of TLIST into BRACES, which is corrected | |
6078 | by a call to reverse_list () on BRACES when the end of TLIST | |
6079 | is reached. */ | |
6080 | if (strchr (tlist->word->word, LBRACE)) | |
726f6388 | 6081 | { |
cce855bc | 6082 | expansions = brace_expand (tlist->word->word); |
726f6388 | 6083 | |
cce855bc | 6084 | for (eindex = 0; temp_string = expansions[eindex]; eindex++) |
726f6388 | 6085 | { |
cce855bc JA |
6086 | w = make_word (temp_string); |
6087 | /* If brace expansion didn't change the word, preserve | |
6088 | the flags. We may want to preserve the flags | |
6089 | unconditionally someday -- XXX */ | |
6090 | if (STREQ (temp_string, tlist->word->word)) | |
6091 | w->flags = tlist->word->flags; | |
6092 | output_list = make_word_list (w, output_list); | |
6093 | free (expansions[eindex]); | |
726f6388 | 6094 | } |
cce855bc | 6095 | free (expansions); |
726f6388 | 6096 | |
cce855bc JA |
6097 | /* Add TLIST to the list of words to be freed after brace |
6098 | expansion has been performed. */ | |
6099 | PREPEND_LIST (tlist, disposables); | |
6100 | } | |
6101 | else | |
6102 | PREPEND_LIST (tlist, output_list); | |
726f6388 | 6103 | } |
cce855bc JA |
6104 | |
6105 | if (disposables) | |
6106 | dispose_words (disposables); | |
6107 | ||
6108 | if (output_list) | |
6109 | output_list = REVERSE_LIST (output_list, WORD_LIST *); | |
6110 | ||
6111 | return (output_list); | |
6112 | } | |
6113 | #endif | |
6114 | ||
6115 | static WORD_LIST * | |
6116 | shell_expand_word_list (tlist, eflags) | |
6117 | WORD_LIST *tlist; | |
6118 | int eflags; | |
6119 | { | |
6120 | WORD_LIST *expanded, *orig_list, *new_list, *next, *temp_list; | |
6121 | int expanded_something, has_dollar_at; | |
6122 | char *temp_string; | |
726f6388 | 6123 | |
726f6388 | 6124 | /* We do tilde expansion all the time. This is what 1003.2 says. */ |
cce855bc JA |
6125 | new_list = (WORD_LIST *)NULL; |
6126 | for (orig_list = tlist; tlist; tlist = next) | |
726f6388 | 6127 | { |
ccc6cda3 | 6128 | temp_string = tlist->word->word; |
726f6388 JA |
6129 | |
6130 | next = tlist->next; | |
6131 | ||
6132 | /* Posix.2 section 3.6.1 says that tildes following `=' in words | |
6133 | which are not assignment statements are not expanded. We do | |
ccc6cda3 JA |
6134 | this only if POSIXLY_CORRECT is enabled. Essentially, we do |
6135 | tilde expansion on unquoted assignment statements (flags include | |
6136 | W_ASSIGNMENT but not W_QUOTED). */ | |
6137 | if (temp_string[0] == '~' || | |
6138 | (((tlist->word->flags & (W_ASSIGNMENT|W_QUOTED)) == W_ASSIGNMENT) && | |
6139 | posixly_correct == 0 && | |
6140 | strchr (temp_string, '~') && | |
6141 | (unquoted_substring ("=~", temp_string) || unquoted_substring (":~", temp_string)))) | |
726f6388 | 6142 | { |
ccc6cda3 JA |
6143 | tlist->word->word = bash_tilde_expand (temp_string); |
6144 | free (temp_string); | |
726f6388 JA |
6145 | } |
6146 | ||
ccc6cda3 | 6147 | expanded_something = 0; |
726f6388 | 6148 | expanded = expand_word_internal |
b72432fd | 6149 | (tlist->word, 0, 0, &has_dollar_at, &expanded_something); |
726f6388 JA |
6150 | |
6151 | if (expanded == &expand_word_error || expanded == &expand_word_fatal) | |
6152 | { | |
6153 | /* By convention, each time this error is returned, | |
6154 | tlist->word->word has already been freed. */ | |
6155 | tlist->word->word = (char *)NULL; | |
ccc6cda3 | 6156 | |
726f6388 JA |
6157 | /* Dispose our copy of the original list. */ |
6158 | dispose_words (orig_list); | |
d166f048 | 6159 | /* Dispose the new list we're building. */ |
726f6388 JA |
6160 | dispose_words (new_list); |
6161 | ||
6162 | if (expanded == &expand_word_error) | |
ccc6cda3 | 6163 | jump_to_top_level (DISCARD); |
726f6388 | 6164 | else |
ccc6cda3 | 6165 | jump_to_top_level (FORCE_EOF); |
726f6388 JA |
6166 | } |
6167 | ||
ccc6cda3 JA |
6168 | /* Don't split words marked W_NOSPLIT. */ |
6169 | if (expanded_something && (tlist->word->flags & W_NOSPLIT) == 0) | |
726f6388 | 6170 | { |
ccc6cda3 | 6171 | temp_list = word_list_split (expanded); |
726f6388 JA |
6172 | dispose_words (expanded); |
6173 | } | |
6174 | else | |
6175 | { | |
6176 | /* If no parameter expansion, command substitution, process | |
6177 | substitution, or arithmetic substitution took place, then | |
6178 | do not do word splitting. We still have to remove quoted | |
6179 | null characters from the result. */ | |
6180 | word_list_remove_quoted_nulls (expanded); | |
ccc6cda3 | 6181 | temp_list = expanded; |
726f6388 JA |
6182 | } |
6183 | ||
ccc6cda3 JA |
6184 | expanded = REVERSE_LIST (temp_list, WORD_LIST *); |
6185 | new_list = (WORD_LIST *)list_append (expanded, new_list); | |
726f6388 JA |
6186 | } |
6187 | ||
cce855bc JA |
6188 | if (orig_list) |
6189 | dispose_words (orig_list); | |
726f6388 | 6190 | |
726f6388 | 6191 | if (new_list) |
cce855bc | 6192 | new_list = REVERSE_LIST (new_list, WORD_LIST *); |
726f6388 | 6193 | |
cce855bc JA |
6194 | return (new_list); |
6195 | } | |
726f6388 | 6196 | |
cce855bc JA |
6197 | /* The workhorse for expand_words () and expand_words_no_vars (). |
6198 | First arg is LIST, a WORD_LIST of words. | |
b72432fd JA |
6199 | Second arg EFLAGS is a flags word controlling which expansions are |
6200 | performed. | |
726f6388 | 6201 | |
cce855bc JA |
6202 | This does all of the substitutions: brace expansion, tilde expansion, |
6203 | parameter expansion, command substitution, arithmetic expansion, | |
6204 | process substitution, word splitting, and pathname expansion, according | |
6205 | to the bits set in EFLAGS. Words with the W_QUOTED or W_NOSPLIT bits | |
6206 | set, or for which no expansion is done, do not undergo word splitting. | |
b72432fd | 6207 | Words with the W_NOGLOB bit set do not undergo pathname expansion. */ |
cce855bc JA |
6208 | static WORD_LIST * |
6209 | expand_word_list_internal (list, eflags) | |
6210 | WORD_LIST *list; | |
6211 | int eflags; | |
6212 | { | |
6213 | WORD_LIST *new_list, *temp_list; | |
6214 | int tint; | |
726f6388 | 6215 | |
cce855bc JA |
6216 | if (list == 0) |
6217 | return ((WORD_LIST *)NULL); | |
726f6388 | 6218 | |
bb70624e | 6219 | garglist = new_list = copy_word_list (list); |
cce855bc JA |
6220 | if (eflags & WEXP_VARASSIGN) |
6221 | { | |
bb70624e | 6222 | garglist = new_list = separate_out_assignments (new_list); |
cce855bc JA |
6223 | if (new_list == 0) |
6224 | { | |
bb70624e | 6225 | if (subst_assign_varlist) |
cce855bc JA |
6226 | { |
6227 | /* All the words were variable assignments, so they are placed | |
6228 | into the shell's environment. */ | |
bb70624e | 6229 | for (temp_list = subst_assign_varlist; temp_list; temp_list = temp_list->next) |
cce855bc JA |
6230 | { |
6231 | this_command_name = (char *)NULL; /* no arithmetic errors */ | |
6232 | tint = do_assignment (temp_list->word->word); | |
6233 | /* Variable assignment errors in non-interactive shells | |
6234 | running in Posix.2 mode cause the shell to exit. */ | |
6235 | if (tint == 0 && interactive_shell == 0 && posixly_correct) | |
ccc6cda3 | 6236 | { |
cce855bc JA |
6237 | last_command_exit_value = EXECUTION_FAILURE; |
6238 | jump_to_top_level (FORCE_EOF); | |
ccc6cda3 | 6239 | } |
726f6388 | 6240 | } |
bb70624e JA |
6241 | dispose_words (subst_assign_varlist); |
6242 | subst_assign_varlist = (WORD_LIST *)NULL; | |
cce855bc JA |
6243 | } |
6244 | return ((WORD_LIST *)NULL); | |
6245 | } | |
6246 | } | |
726f6388 | 6247 | |
cce855bc JA |
6248 | /* Begin expanding the words that remain. The expansions take place on |
6249 | things that aren't really variable assignments. */ | |
726f6388 | 6250 | |
cce855bc JA |
6251 | #if defined (BRACE_EXPANSION) |
6252 | /* Do brace expansion on this word if there are any brace characters | |
6253 | in the string. */ | |
6254 | if ((eflags & WEXP_BRACEEXP) && brace_expansion && new_list) | |
6255 | new_list = brace_expand_word_list (new_list, eflags); | |
6256 | #endif /* BRACE_EXPANSION */ | |
726f6388 | 6257 | |
cce855bc JA |
6258 | /* Perform the `normal' shell expansions: tilde expansion, parameter and |
6259 | variable substitution, command substitution, arithmetic expansion, | |
6260 | and word splitting. */ | |
6261 | new_list = shell_expand_word_list (new_list, eflags); | |
726f6388 | 6262 | |
cce855bc JA |
6263 | /* Okay, we're almost done. Now let's just do some filename |
6264 | globbing. */ | |
6265 | if (new_list) | |
6266 | { | |
6267 | if ((eflags & WEXP_PATHEXP) && disallow_filename_globbing == 0) | |
6268 | /* Glob expand the word list unless globbing has been disabled. */ | |
6269 | new_list = glob_expand_word_list (new_list, eflags); | |
726f6388 | 6270 | else |
cce855bc JA |
6271 | /* Dequote the words, because we're not performing globbing. */ |
6272 | new_list = dequote_list (new_list); | |
726f6388 JA |
6273 | } |
6274 | ||
bb70624e | 6275 | if ((eflags & WEXP_VARASSIGN) && subst_assign_varlist) |
726f6388 | 6276 | { |
726f6388 JA |
6277 | Function *assign_func; |
6278 | ||
6279 | /* If the remainder of the words expand to nothing, Posix.2 requires | |
6280 | that the variable and environment assignments affect the shell's | |
6281 | environment. */ | |
6282 | assign_func = new_list ? assign_in_env : do_assignment; | |
6283 | ||
bb70624e | 6284 | for (temp_list = subst_assign_varlist; temp_list; temp_list = temp_list->next) |
726f6388 | 6285 | { |
ccc6cda3 JA |
6286 | this_command_name = (char *)NULL; |
6287 | tint = (*assign_func) (temp_list->word->word); | |
6288 | /* Variable assignment errors in non-interactive shells running | |
6289 | in Posix.2 mode cause the shell to exit. */ | |
6290 | if (tint == 0 && assign_func == do_assignment && | |
6291 | interactive_shell == 0 && posixly_correct) | |
6292 | { | |
6293 | last_command_exit_value = EXECUTION_FAILURE; | |
6294 | jump_to_top_level (FORCE_EOF); | |
6295 | } | |
726f6388 | 6296 | } |
726f6388 | 6297 | |
bb70624e JA |
6298 | dispose_words (subst_assign_varlist); |
6299 | subst_assign_varlist = (WORD_LIST *)NULL; | |
726f6388 JA |
6300 | } |
6301 | ||
cce855bc | 6302 | #if 0 |
ccc6cda3 JA |
6303 | tint = list_length (new_list) + 1; |
6304 | RESIZE_MALLOCED_BUFFER (glob_argv_flags, 0, tint, glob_argv_flags_size, 16); | |
cce855bc JA |
6305 | for (tint = 0, temp_list = new_list; temp_list; temp_list = temp_list->next) |
6306 | glob_argv_flags[tint++] = (temp_list->word->flags & W_GLOBEXP) ? '1' : '0'; | |
ccc6cda3 | 6307 | glob_argv_flags[tint] = '\0'; |
ccc6cda3 | 6308 | #endif |
726f6388 | 6309 | |
cce855bc | 6310 | return (new_list); |
ccc6cda3 | 6311 | } |