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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 | ||
4 | /* Copyright (C) 1987,1989 Free Software Foundation, Inc. | |
5 | ||
6 | This file is part of GNU Bash, the Bourne Again SHell. | |
7 | ||
8 | Bash is free software; you can redistribute it and/or modify it under | |
9 | the terms of the GNU General Public License as published by the Free | |
10 | Software Foundation; either version 2, or (at your option) any later | |
11 | version. | |
12 | ||
13 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License along | |
19 | with Bash; see the file COPYING. If not, write to the Free Software | |
20 | Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
21 | ||
ccc6cda3 JA |
22 | #include "config.h" |
23 | ||
726f6388 JA |
24 | #include "bashtypes.h" |
25 | #include <stdio.h> | |
26 | #include <pwd.h> | |
27 | #include <signal.h> | |
28 | #include <errno.h> | |
ccc6cda3 JA |
29 | |
30 | #if defined (HAVE_UNISTD_H) | |
31 | # include <unistd.h> | |
32 | #endif | |
726f6388 JA |
33 | |
34 | #include "bashansi.h" | |
35 | #include "posixstat.h" | |
36 | ||
37 | #include "shell.h" | |
38 | #include "flags.h" | |
39 | #include "jobs.h" | |
40 | #include "execute_cmd.h" | |
41 | #include "filecntl.h" | |
ccc6cda3 JA |
42 | #include "trap.h" |
43 | #include "pathexp.h" | |
44 | #include "mailcheck.h" | |
45 | ||
d166f048 JA |
46 | #if !defined (HAVE_RESTARTABLE_SYSCALLS) /* for getc_with_restart */ |
47 | #include "input.h" | |
48 | #endif | |
49 | ||
ccc6cda3 JA |
50 | #include "builtins/getopt.h" |
51 | #include "builtins/common.h" | |
726f6388 | 52 | |
cce855bc | 53 | #include <tilde/tilde.h> |
726f6388 | 54 | #include <glob/fnmatch.h> |
ccc6cda3 JA |
55 | |
56 | #if !defined (errno) | |
57 | extern int errno; | |
58 | #endif /* !errno */ | |
726f6388 JA |
59 | |
60 | /* The size that strings change by. */ | |
d166f048 | 61 | #define DEFAULT_INITIAL_ARRAY_SIZE 112 |
ccc6cda3 JA |
62 | #define DEFAULT_ARRAY_SIZE 128 |
63 | ||
64 | /* Variable types. */ | |
65 | #define VT_VARIABLE 0 | |
66 | #define VT_POSPARMS 1 | |
67 | #define VT_ARRAYVAR 2 | |
d166f048 | 68 | #define VT_ARRAYMEMBER 3 |
726f6388 | 69 | |
ccc6cda3 JA |
70 | /* Flags for quoted_strchr */ |
71 | #define ST_BACKSL 0x01 | |
72 | #define ST_CTLESC 0x02 | |
73 | ||
cce855bc JA |
74 | /* These defs make it easier to use the editor. */ |
75 | #define LBRACE '{' | |
76 | #define RBRACE '}' | |
77 | #define LPAREN '(' | |
78 | #define RPAREN ')' | |
726f6388 JA |
79 | |
80 | /* Process ID of the last command executed within command substitution. */ | |
81 | pid_t last_command_subst_pid = NO_PID; | |
b72432fd | 82 | pid_t current_command_subst_pid = NO_PID; |
726f6388 JA |
83 | |
84 | /* Extern functions and variables from different files. */ | |
85 | extern int last_command_exit_value, interactive, interactive_shell; | |
ccc6cda3 JA |
86 | extern int subshell_environment, startup_state; |
87 | extern int dollar_dollar_pid; | |
726f6388 | 88 | extern int posixly_correct; |
726f6388 | 89 | extern char *this_command_name; |
ccc6cda3 | 90 | extern struct fd_bitmap *current_fds_to_close; |
cce855bc | 91 | extern int wordexp_only; |
726f6388 | 92 | |
ccc6cda3 JA |
93 | extern void getopts_reset (); |
94 | ||
95 | /* Non-zero means to allow unmatched globbed filenames to expand to | |
96 | a null file. */ | |
97 | int allow_null_glob_expansion; | |
98 | ||
99 | /* Variables to keep track of which words in an expanded word list (the | |
100 | output of expand_word_list_internal) are the result of globbing | |
101 | expansions. GLOB_ARGV_FLAGS is used by execute_cmd.c. */ | |
102 | char *glob_argv_flags; | |
103 | static int glob_argv_flags_size; | |
726f6388 JA |
104 | |
105 | static WORD_LIST expand_word_error, expand_word_fatal; | |
106 | static char expand_param_error, expand_param_fatal; | |
107 | ||
b72432fd JA |
108 | static int doing_completion = 0; |
109 | ||
cce855bc JA |
110 | static char *make_quoted_char (); |
111 | static void remove_quoted_nulls (); | |
112 | static char *param_expand (); | |
113 | static char *maybe_expand_string (); | |
114 | static WORD_LIST *call_expand_word_internal (); | |
726f6388 | 115 | static WORD_LIST *expand_string_internal (); |
ccc6cda3 | 116 | static WORD_LIST *expand_word_internal (), *expand_word_list_internal (); |
726f6388 | 117 | static WORD_LIST *expand_string_leave_quoted (); |
ccc6cda3 | 118 | static WORD_LIST *expand_string_for_rhs (); |
b72432fd | 119 | static char *getifs (); |
726f6388 | 120 | static WORD_LIST *word_list_split (); |
ccc6cda3 | 121 | static WORD_LIST *quote_list (), *dequote_list (); |
cce855bc JA |
122 | static char *quote_escapes (); |
123 | static WORD_LIST *list_quote_escapes (); | |
726f6388 | 124 | static int unquoted_substring (), unquoted_member (); |
726f6388 JA |
125 | static int do_assignment_internal (); |
126 | static char *string_extract_verbatim (), *string_extract (); | |
127 | static char *string_extract_double_quoted (), *string_extract_single_quoted (); | |
cce855bc JA |
128 | static char *string_list_dollar_at (), *string_list_dollar_star (); |
129 | static inline int skip_single_quoted (), skip_double_quoted (); | |
726f6388 JA |
130 | static char *extract_delimited_string (); |
131 | static char *extract_dollar_brace_string (); | |
132 | ||
133 | /* **************************************************************** */ | |
134 | /* */ | |
135 | /* Utility Functions */ | |
136 | /* */ | |
137 | /* **************************************************************** */ | |
138 | ||
139 | /* Cons a new string from STRING starting at START and ending at END, | |
140 | not including END. */ | |
141 | char * | |
142 | substring (string, start, end) | |
143 | char *string; | |
144 | int start, end; | |
145 | { | |
ccc6cda3 JA |
146 | register int len; |
147 | register char *result; | |
726f6388 | 148 | |
ccc6cda3 JA |
149 | len = end - start; |
150 | result = xmalloc (len + 1); | |
726f6388 JA |
151 | strncpy (result, string + start, len); |
152 | result[len] = '\0'; | |
153 | return (result); | |
154 | } | |
155 | ||
ccc6cda3 JA |
156 | static char * |
157 | quoted_substring (string, start, end) | |
158 | char *string; | |
159 | int start, end; | |
160 | { | |
161 | register int len, l; | |
162 | register char *result, *s, *r; | |
163 | ||
164 | len = end - start; | |
165 | ||
166 | /* Move to string[start], skipping quoted characters. */ | |
167 | for (s = string, l = 0; *s && l < start; ) | |
168 | { | |
169 | if (*s == CTLESC) | |
170 | { | |
171 | s++; | |
172 | continue; | |
173 | } | |
174 | l++; | |
175 | if (*s == 0) | |
176 | break; | |
177 | } | |
178 | ||
179 | r = result = xmalloc (2*len + 1); /* save room for quotes */ | |
180 | ||
181 | /* Copy LEN characters, including quote characters. */ | |
182 | s = string + l; | |
183 | for (l = 0; l < len; s++) | |
184 | { | |
185 | if (*s == CTLESC) | |
186 | *r++ = *s++; | |
187 | *r++ = *s; | |
188 | l++; | |
189 | if (*s == 0) | |
190 | break; | |
191 | } | |
192 | *r = '\0'; | |
193 | return result; | |
194 | } | |
195 | ||
196 | /* Find the first occurrence of character C in string S, obeying shell | |
197 | quoting rules. If (FLAGS & ST_BACKSL) is non-zero, backslash-escaped | |
198 | characters are skipped. If (FLAGS & ST_CTLESC) is non-zero, characters | |
199 | escaped with CTLESC are skipped. */ | |
200 | static inline char * | |
201 | quoted_strchr (s, c, flags) | |
202 | char *s; | |
203 | int c, flags; | |
204 | { | |
205 | register char *p; | |
206 | ||
207 | for (p = s; *p; p++) | |
208 | { | |
209 | if (((flags & ST_BACKSL) && *p == '\\') | |
210 | || ((flags & ST_CTLESC) && *p == CTLESC)) | |
211 | { | |
212 | p++; | |
213 | if (*p == '\0') | |
214 | return ((char *)NULL); | |
215 | continue; | |
216 | } | |
217 | else if (*p == c) | |
218 | return p; | |
219 | } | |
220 | return ((char *)NULL); | |
221 | } | |
222 | ||
cce855bc JA |
223 | /* Return 1 if CHARACTER appears in an unquoted portion of |
224 | STRING. Return 0 otherwise. */ | |
225 | static int | |
226 | unquoted_member (character, string) | |
227 | int character; | |
726f6388 JA |
228 | char *string; |
229 | { | |
cce855bc | 230 | int sindex, c; |
726f6388 | 231 | |
cce855bc | 232 | for (sindex = 0; c = string[sindex]; ) |
726f6388 | 233 | { |
cce855bc JA |
234 | if (c == character) |
235 | return (1); | |
236 | ||
237 | switch (c) | |
ccc6cda3 | 238 | { |
cce855bc JA |
239 | default: |
240 | sindex++; | |
241 | break; | |
242 | ||
243 | case '\\': | |
244 | sindex++; | |
245 | if (string[sindex]) | |
246 | sindex++; | |
247 | break; | |
248 | ||
249 | case '\'': | |
250 | sindex = skip_single_quoted (string, ++sindex); | |
251 | break; | |
252 | ||
253 | case '"': | |
254 | sindex = skip_double_quoted (string, ++sindex); | |
255 | break; | |
ccc6cda3 | 256 | } |
726f6388 | 257 | } |
cce855bc | 258 | return (0); |
726f6388 JA |
259 | } |
260 | ||
cce855bc JA |
261 | /* Return 1 if SUBSTR appears in an unquoted portion of STRING. */ |
262 | static int | |
263 | unquoted_substring (substr, string) | |
264 | char *substr, *string; | |
726f6388 | 265 | { |
cce855bc | 266 | int sindex, c, sublen; |
726f6388 | 267 | |
cce855bc JA |
268 | if (substr == 0 || *substr == '\0') |
269 | return (0); | |
270 | ||
271 | sublen = strlen (substr); | |
272 | for (sindex = 0; c = string[sindex]; ) | |
726f6388 | 273 | { |
cce855bc JA |
274 | if (STREQN (string + sindex, substr, sublen)) |
275 | return (1); | |
276 | ||
277 | switch (c) | |
278 | { | |
279 | case '\\': | |
280 | sindex++; | |
281 | ||
282 | if (string[sindex]) | |
283 | sindex++; | |
284 | break; | |
285 | ||
286 | case '\'': | |
287 | sindex = skip_single_quoted (string, ++sindex); | |
288 | break; | |
289 | ||
290 | case '"': | |
291 | sindex = skip_double_quoted (string, ++sindex); | |
292 | break; | |
293 | ||
294 | default: | |
295 | sindex++; | |
296 | break; | |
297 | } | |
726f6388 | 298 | } |
cce855bc | 299 | return (0); |
ccc6cda3 | 300 | } |
726f6388 | 301 | |
cce855bc JA |
302 | /* Most of the substitutions must be done in parallel. In order |
303 | to avoid using tons of unclear goto's, I have some functions | |
304 | for manipulating malloc'ed strings. They all take INDX, a | |
305 | pointer to an integer which is the offset into the string | |
306 | where manipulation is taking place. They also take SIZE, a | |
307 | pointer to an integer which is the current length of the | |
308 | character array for this string. */ | |
726f6388 | 309 | |
cce855bc JA |
310 | /* Append SOURCE to TARGET at INDEX. SIZE is the current amount |
311 | of space allocated to TARGET. SOURCE can be NULL, in which | |
312 | case nothing happens. Gets rid of SOURCE by freeing it. | |
313 | Returns TARGET in case the location has changed. */ | |
314 | inline char * | |
315 | sub_append_string (source, target, indx, size) | |
316 | char *source, *target; | |
317 | int *indx, *size; | |
318 | { | |
319 | if (source) | |
726f6388 | 320 | { |
cce855bc JA |
321 | int srclen, n; |
322 | ||
323 | srclen = STRLEN (source); | |
324 | if (srclen >= (int)(*size - *indx)) | |
726f6388 | 325 | { |
cce855bc JA |
326 | n = srclen + *indx; |
327 | n = (n + DEFAULT_ARRAY_SIZE) - (n % DEFAULT_ARRAY_SIZE); | |
328 | target = xrealloc (target, (*size = n)); | |
726f6388 | 329 | } |
cce855bc JA |
330 | |
331 | FASTCOPY (source, target + *indx, srclen); | |
332 | *indx += srclen; | |
333 | target[*indx] = '\0'; | |
334 | ||
335 | free (source); | |
726f6388 | 336 | } |
cce855bc JA |
337 | return (target); |
338 | } | |
339 | ||
340 | #if 0 | |
341 | /* UNUSED */ | |
342 | /* Append the textual representation of NUMBER to TARGET. | |
343 | INDX and SIZE are as in SUB_APPEND_STRING. */ | |
344 | char * | |
345 | sub_append_number (number, target, indx, size) | |
346 | int number, *indx, *size; | |
347 | char *target; | |
348 | { | |
349 | char *temp; | |
350 | ||
351 | temp = itos (number); | |
352 | return (sub_append_string (temp, target, indx, size)); | |
726f6388 | 353 | } |
d166f048 | 354 | #endif |
726f6388 JA |
355 | |
356 | /* Extract a substring from STRING, starting at SINDEX and ending with | |
357 | one of the characters in CHARLIST. Don't make the ending character | |
358 | part of the string. Leave SINDEX pointing at the ending character. | |
ccc6cda3 JA |
359 | Understand about backslashes in the string. If VARNAME is non-zero, |
360 | and array variables have been compiled into the shell, everything | |
361 | between a `[' and a corresponding `]' is skipped over. */ | |
726f6388 | 362 | static char * |
ccc6cda3 | 363 | string_extract (string, sindex, charlist, varname) |
726f6388 | 364 | char *string, *charlist; |
ccc6cda3 | 365 | int *sindex, varname; |
726f6388 | 366 | { |
ccc6cda3 | 367 | register int c, i; |
726f6388 JA |
368 | char *temp; |
369 | ||
ccc6cda3 | 370 | for (i = *sindex; c = string[i]; i++) |
726f6388 JA |
371 | { |
372 | if (c == '\\') | |
373 | if (string[i + 1]) | |
374 | i++; | |
375 | else | |
376 | break; | |
ccc6cda3 JA |
377 | #if defined (ARRAY_VARS) |
378 | else if (varname && c == '[') | |
379 | { | |
380 | int ni; | |
381 | /* If this is an array subscript, skip over it and continue. */ | |
382 | ni = skipsubscript (string, i); | |
383 | if (string[ni] == ']') | |
384 | i = ni; | |
385 | } | |
386 | #endif | |
387 | else if (MEMBER (c, charlist)) | |
726f6388 | 388 | break; |
726f6388 | 389 | } |
ccc6cda3 JA |
390 | c = i - *sindex; |
391 | temp = xmalloc (1 + c); | |
392 | strncpy (temp, string + *sindex, c); | |
393 | temp[c] = '\0'; | |
726f6388 JA |
394 | *sindex = i; |
395 | return (temp); | |
396 | } | |
397 | ||
ccc6cda3 JA |
398 | /* Extract the contents of STRING as if it is enclosed in double quotes. |
399 | SINDEX, when passed in, is the offset of the character immediately | |
400 | following the opening double quote; on exit, SINDEX is left pointing after | |
401 | the closing double quote. If STRIPDQ is non-zero, unquoted double | |
402 | quotes are stripped and the string is terminated by a null byte. | |
403 | Backslashes between the embedded double quotes are processed. If STRIPDQ | |
404 | is zero, an unquoted `"' terminates the string. */ | |
405 | static inline char * | |
406 | string_extract_double_quoted (string, sindex, stripdq) | |
726f6388 | 407 | char *string; |
ccc6cda3 | 408 | int *sindex, stripdq; |
726f6388 | 409 | { |
ccc6cda3 JA |
410 | int c, j, i, t; |
411 | char *temp, *ret; /* The new string we return. */ | |
412 | int pass_next, backquote, si; /* State variables for the machine. */ | |
413 | int dquote; | |
726f6388 | 414 | |
ccc6cda3 JA |
415 | pass_next = backquote = dquote = 0; |
416 | temp = xmalloc (1 + strlen (string) - *sindex); | |
726f6388 | 417 | |
ccc6cda3 | 418 | for (j = 0, i = *sindex; c = string[i]; i++) |
726f6388 | 419 | { |
ccc6cda3 JA |
420 | /* Process a character that was quoted by a backslash. */ |
421 | if (pass_next) | |
726f6388 | 422 | { |
ccc6cda3 | 423 | /* Posix.2 sez: |
726f6388 | 424 | |
ccc6cda3 JA |
425 | ``The backslash shall retain its special meaning as an escape |
426 | character only when followed by one of the characters: | |
427 | $ ` " \ <newline>''. | |
726f6388 | 428 | |
ccc6cda3 JA |
429 | If STRIPDQ is zero, we handle the double quotes here and let |
430 | expand_word_internal handle the rest. If STRIPDQ is non-zero, | |
431 | we have already been through one round of backslash stripping, | |
432 | and want to strip these backslashes only if DQUOTE is non-zero, | |
433 | indicating that we are inside an embedded double-quoted string. */ | |
434 | ||
435 | /* If we are in an embedded quoted string, then don't strip | |
436 | backslashes before characters for which the backslash | |
437 | retains its special meaning, but remove backslashes in | |
438 | front of other characters. If we are not in an | |
439 | embedded quoted string, don't strip backslashes at all. | |
440 | This mess is necessary because the string was already | |
441 | surrounded by double quotes (and sh has some really weird | |
442 | quoting rules). | |
443 | The returned string will be run through expansion as if | |
444 | it were double-quoted. */ | |
445 | if ((stripdq == 0 && c != '"') || | |
446 | (stripdq && ((dquote && strchr (slashify_in_quotes, c)) || dquote == 0))) | |
447 | temp[j++] = '\\'; | |
448 | temp[j++] = c; | |
449 | pass_next = 0; | |
450 | continue; | |
451 | } | |
726f6388 | 452 | |
ccc6cda3 JA |
453 | /* A backslash protects the next character. The code just above |
454 | handles preserving the backslash in front of any character but | |
455 | a double quote. */ | |
456 | if (c == '\\') | |
726f6388 | 457 | { |
ccc6cda3 | 458 | pass_next++; |
726f6388 JA |
459 | continue; |
460 | } | |
461 | ||
ccc6cda3 JA |
462 | /* Inside backquotes, ``the portion of the quoted string from the |
463 | initial backquote and the characters up to the next backquote | |
464 | that is not preceded by a backslash, having escape characters | |
465 | removed, defines that command''. */ | |
466 | if (backquote) | |
726f6388 | 467 | { |
ccc6cda3 JA |
468 | if (c == '`') |
469 | backquote = 0; | |
470 | temp[j++] = c; | |
726f6388 JA |
471 | continue; |
472 | } | |
473 | ||
ccc6cda3 | 474 | if (c == '`') |
726f6388 | 475 | { |
ccc6cda3 JA |
476 | temp[j++] = c; |
477 | backquote++; | |
478 | continue; | |
726f6388 JA |
479 | } |
480 | ||
ccc6cda3 JA |
481 | /* Pass everything between `$(' and the matching `)' or a quoted |
482 | ${ ... } pair through according to the Posix.2 specification. */ | |
cce855bc | 483 | if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE))) |
726f6388 | 484 | { |
ccc6cda3 | 485 | si = i + 2; |
cce855bc JA |
486 | if (string[i + 1] == LPAREN) |
487 | ret = extract_delimited_string (string, &si, "$(", "(", ")"); /*)*/ | |
ccc6cda3 JA |
488 | else |
489 | ret = extract_dollar_brace_string (string, &si, 1); | |
726f6388 | 490 | |
ccc6cda3 JA |
491 | temp[j++] = '$'; |
492 | temp[j++] = string[i + 1]; | |
726f6388 | 493 | |
ccc6cda3 JA |
494 | for (t = 0; ret[t]; t++, j++) |
495 | temp[j] = ret[t]; | |
496 | temp[j++] = string[si]; | |
726f6388 | 497 | |
ccc6cda3 JA |
498 | i = si; |
499 | free (ret); | |
500 | continue; | |
726f6388 JA |
501 | } |
502 | ||
ccc6cda3 JA |
503 | /* Add any character but a double quote to the quoted string we're |
504 | accumulating. */ | |
505 | if (c != '"') | |
726f6388 | 506 | { |
ccc6cda3 | 507 | temp[j++] = c; |
726f6388 JA |
508 | continue; |
509 | } | |
ccc6cda3 JA |
510 | |
511 | /* c == '"' */ | |
512 | if (stripdq) | |
726f6388 | 513 | { |
ccc6cda3 JA |
514 | dquote ^= 1; |
515 | continue; | |
726f6388 | 516 | } |
ccc6cda3 JA |
517 | |
518 | break; | |
726f6388 | 519 | } |
ccc6cda3 | 520 | temp[j] = '\0'; |
726f6388 | 521 | |
ccc6cda3 JA |
522 | /* Point to after the closing quote. */ |
523 | if (c) | |
524 | i++; | |
726f6388 JA |
525 | *sindex = i; |
526 | ||
ccc6cda3 JA |
527 | return (temp); |
528 | } | |
529 | ||
530 | /* This should really be another option to string_extract_double_quoted. */ | |
531 | static inline int | |
532 | skip_double_quoted (string, sind) | |
533 | char *string; | |
534 | int sind; | |
535 | { | |
536 | int c, j, i; | |
537 | char *ret; | |
538 | int pass_next, backquote, si; | |
539 | ||
540 | pass_next = backquote = 0; | |
541 | ||
542 | for (j = 0, i = sind; c = string[i]; i++) | |
726f6388 | 543 | { |
ccc6cda3 JA |
544 | if (pass_next) |
545 | { | |
546 | pass_next = 0; | |
547 | continue; | |
548 | } | |
549 | else if (c == '\\') | |
550 | { | |
551 | pass_next++; | |
552 | continue; | |
553 | } | |
554 | else if (backquote) | |
555 | { | |
556 | if (c == '`') | |
557 | backquote = 0; | |
558 | continue; | |
559 | } | |
560 | else if (c == '`') | |
561 | { | |
562 | backquote++; | |
563 | continue; | |
564 | } | |
cce855bc | 565 | else if (c == '$' && ((string[i + 1] == LPAREN) || (string[i + 1] == LBRACE))) |
ccc6cda3 JA |
566 | { |
567 | si = i + 2; | |
cce855bc | 568 | if (string[i + 1] == LPAREN) |
ccc6cda3 JA |
569 | ret = extract_delimited_string (string, &si, "$(", "(", ")"); |
570 | else | |
571 | ret = extract_dollar_brace_string (string, &si, 0); | |
572 | ||
573 | i = si; | |
574 | free (ret); | |
575 | continue; | |
576 | } | |
577 | else if (c != '"') | |
578 | continue; | |
579 | else | |
580 | break; | |
726f6388 | 581 | } |
ccc6cda3 JA |
582 | |
583 | if (c) | |
584 | i++; | |
585 | ||
586 | return (i); | |
726f6388 JA |
587 | } |
588 | ||
ccc6cda3 JA |
589 | /* Extract the contents of STRING as if it is enclosed in single quotes. |
590 | SINDEX, when passed in, is the offset of the character immediately | |
591 | following the opening single quote; on exit, SINDEX is left pointing after | |
592 | the closing single quote. */ | |
593 | static inline char * | |
594 | string_extract_single_quoted (string, sindex) | |
595 | char *string; | |
596 | int *sindex; | |
597 | { | |
598 | register int i, j; | |
599 | char *t; | |
600 | ||
601 | for (i = *sindex; string[i] && string[i] != '\''; i++) | |
602 | ; | |
603 | ||
604 | j = i - *sindex; | |
605 | t = xmalloc (1 + j); | |
606 | strncpy (t, string + *sindex, j); | |
607 | t[j] = '\0'; | |
608 | ||
609 | if (string[i]) | |
610 | i++; | |
611 | *sindex = i; | |
612 | ||
613 | return (t); | |
614 | } | |
615 | ||
616 | static inline int | |
617 | skip_single_quoted (string, sind) | |
618 | char *string; | |
619 | int sind; | |
620 | { | |
621 | register int i; | |
622 | ||
623 | for (i = sind; string[i] && string[i] != '\''; i++) | |
624 | ; | |
625 | if (string[i]) | |
626 | i++; | |
627 | return i; | |
628 | } | |
629 | ||
630 | /* Just like string_extract, but doesn't hack backslashes or any of | |
631 | that other stuff. Obeys quoting. Used to do splitting on $IFS. */ | |
726f6388 | 632 | static char * |
ccc6cda3 JA |
633 | string_extract_verbatim (string, sindex, charlist) |
634 | char *string, *charlist; | |
635 | int *sindex; | |
636 | { | |
637 | register int i = *sindex; | |
638 | int c; | |
639 | char *temp; | |
640 | ||
641 | if (charlist[0] == '\'' && charlist[1] == '\0') | |
642 | { | |
643 | temp = string_extract_single_quoted (string, sindex); | |
644 | --*sindex; /* leave *sindex at separator character */ | |
645 | return temp; | |
646 | } | |
647 | ||
648 | for (i = *sindex; c = string[i]; i++) | |
649 | { | |
650 | if (c == CTLESC) | |
651 | { | |
652 | i++; | |
653 | continue; | |
654 | } | |
655 | ||
656 | if (MEMBER (c, charlist)) | |
657 | break; | |
658 | } | |
659 | ||
660 | c = i - *sindex; | |
661 | temp = xmalloc (1 + c); | |
662 | strncpy (temp, string + *sindex, c); | |
663 | temp[c] = '\0'; | |
664 | *sindex = i; | |
665 | ||
666 | return (temp); | |
667 | } | |
668 | ||
669 | /* Extract the $( construct in STRING, and return a new string. | |
670 | Start extracting at (SINDEX) as if we had just seen "$(". | |
671 | Make (SINDEX) get the position of the matching ")". */ | |
672 | char * | |
673 | extract_command_subst (string, sindex) | |
726f6388 JA |
674 | char *string; |
675 | int *sindex; | |
676 | { | |
ccc6cda3 JA |
677 | return (extract_delimited_string (string, sindex, "$(", "(", ")")); |
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_arithmetic_subst (string, sindex) | |
685 | char *string; | |
686 | int *sindex; | |
687 | { | |
688 | return (extract_delimited_string (string, sindex, "$[", "[", "]")); | |
689 | } | |
690 | ||
691 | #if defined (PROCESS_SUBSTITUTION) | |
692 | /* Extract the <( or >( construct in STRING, and return a new string. | |
693 | Start extracting at (SINDEX) as if we had just seen "<(". | |
cce855bc | 694 | Make (SINDEX) get the position of the matching ")". */ /*))*/ |
ccc6cda3 JA |
695 | char * |
696 | extract_process_subst (string, starter, sindex) | |
697 | char *string; | |
698 | char *starter; | |
699 | int *sindex; | |
700 | { | |
701 | return (extract_delimited_string (string, sindex, starter, "(", ")")); | |
702 | } | |
703 | #endif /* PROCESS_SUBSTITUTION */ | |
704 | ||
705 | #if defined (ARRAY_VARS) | |
706 | char * | |
707 | extract_array_assignment_list (string, sindex) | |
708 | char *string; | |
709 | int *sindex; | |
710 | { | |
711 | return (extract_delimited_string (string, sindex, "(", (char *)NULL, ")")); | |
712 | } | |
713 | #endif | |
714 | ||
715 | /* Extract and create a new string from the contents of STRING, a | |
716 | character string delimited with OPENER and CLOSER. SINDEX is | |
717 | the address of an int describing the current offset in STRING; | |
718 | it should point to just after the first OPENER found. On exit, | |
719 | SINDEX gets the position of the last character of the matching CLOSER. | |
720 | If OPENER is more than a single character, ALT_OPENER, if non-null, | |
721 | contains a character string that can also match CLOSER and thus | |
722 | needs to be skipped. */ | |
723 | static char * | |
724 | extract_delimited_string (string, sindex, opener, alt_opener, closer) | |
725 | char *string; | |
726 | int *sindex; | |
727 | char *opener, *alt_opener, *closer; | |
728 | { | |
729 | int i, c, si; | |
730 | char *t, *result; | |
726f6388 | 731 | int pass_character, nesting_level; |
ccc6cda3 JA |
732 | int len_closer, len_opener, len_alt_opener; |
733 | ||
734 | len_opener = STRLEN (opener); | |
735 | len_alt_opener = STRLEN (alt_opener); | |
736 | len_closer = STRLEN (closer); | |
726f6388 | 737 | |
ccc6cda3 | 738 | pass_character = 0; |
726f6388 JA |
739 | |
740 | nesting_level = 1; | |
ccc6cda3 | 741 | i = *sindex; |
726f6388 | 742 | |
ccc6cda3 | 743 | while (nesting_level) |
726f6388 | 744 | { |
ccc6cda3 JA |
745 | c = string[i]; |
746 | ||
747 | if (c == 0) | |
748 | break; | |
749 | ||
750 | if (pass_character) /* previous char was backslash */ | |
726f6388 JA |
751 | { |
752 | pass_character = 0; | |
ccc6cda3 | 753 | i++; |
726f6388 JA |
754 | continue; |
755 | } | |
756 | ||
757 | if (c == CTLESC) | |
758 | { | |
759 | pass_character++; | |
ccc6cda3 | 760 | i++; |
726f6388 JA |
761 | continue; |
762 | } | |
763 | ||
ccc6cda3 JA |
764 | #if 0 |
765 | if (c == '\\' && delimiter == '"' && | |
766 | (member (string[i], slashify_in_quotes))) | |
767 | #else | |
726f6388 | 768 | if (c == '\\') |
ccc6cda3 | 769 | #endif |
726f6388 | 770 | { |
ccc6cda3 JA |
771 | pass_character++; |
772 | i++; | |
773 | continue; | |
726f6388 JA |
774 | } |
775 | ||
ccc6cda3 JA |
776 | /* Process a nested OPENER. */ |
777 | if (STREQN (string + i, opener, len_opener)) | |
726f6388 | 778 | { |
ccc6cda3 JA |
779 | si = i + len_opener; |
780 | t = extract_delimited_string (string, &si, opener, alt_opener, closer); | |
781 | i = si + 1; | |
782 | FREE (t); | |
783 | continue; | |
726f6388 JA |
784 | } |
785 | ||
ccc6cda3 JA |
786 | /* Process a nested ALT_OPENER */ |
787 | if (len_alt_opener && STREQN (string + i, alt_opener, len_alt_opener)) | |
726f6388 | 788 | { |
ccc6cda3 JA |
789 | si = i + len_alt_opener; |
790 | t = extract_delimited_string (string, &si, alt_opener, alt_opener, closer); | |
791 | i = si + 1; | |
792 | FREE (t); | |
726f6388 JA |
793 | continue; |
794 | } | |
ccc6cda3 JA |
795 | |
796 | /* If the current substring terminates the delimited string, decrement | |
797 | the nesting level. */ | |
798 | if (STREQN (string + i, closer, len_closer)) | |
726f6388 | 799 | { |
ccc6cda3 JA |
800 | i += len_closer - 1; /* move to last char of the closer */ |
801 | nesting_level--; | |
802 | if (nesting_level == 0) | |
803 | break; | |
726f6388 | 804 | } |
ccc6cda3 JA |
805 | |
806 | /* Pass old-style command substitution through verbatim. */ | |
807 | if (c == '`') | |
808 | { | |
809 | si = i + 1; | |
810 | t = string_extract (string, &si, "`", 0); | |
811 | i = si + 1; | |
812 | FREE (t); | |
813 | continue; | |
814 | } | |
815 | ||
816 | /* Pass single-quoted strings through verbatim. */ | |
817 | if (c == '\'') | |
818 | { | |
819 | si = i + 1; | |
820 | i = skip_single_quoted (string, si); | |
821 | continue; | |
822 | } | |
823 | ||
824 | /* Pass embedded double-quoted strings through verbatim as well. */ | |
825 | if (c == '"') | |
826 | { | |
827 | si = i + 1; | |
828 | i = skip_double_quoted (string, si); | |
829 | continue; | |
830 | } | |
831 | ||
832 | i++; /* move past this character, which was not special. */ | |
726f6388 JA |
833 | } |
834 | ||
ccc6cda3 | 835 | if (c == 0 && nesting_level) |
726f6388 | 836 | { |
ccc6cda3 | 837 | report_error ("bad substitution: no `%s' in %s", closer, string); |
ccc6cda3 | 838 | jump_to_top_level (DISCARD); |
726f6388 | 839 | } |
ccc6cda3 | 840 | |
cce855bc JA |
841 | si = i - *sindex - len_closer + 1; |
842 | result = xmalloc (1 + si); | |
843 | strncpy (result, string + *sindex, si); | |
844 | result[si] = '\0'; | |
845 | *sindex = i; | |
846 | ||
726f6388 JA |
847 | return (result); |
848 | } | |
849 | ||
ccc6cda3 JA |
850 | /* Extract a parameter expansion expression within ${ and } from STRING. |
851 | Obey the Posix.2 rules for finding the ending `}': count braces while | |
852 | skipping over enclosed quoted strings and command substitutions. | |
853 | SINDEX is the address of an int describing the current offset in STRING; | |
854 | it should point to just after the first `{' found. On exit, SINDEX | |
855 | gets the position of the matching `}'. QUOTED is non-zero if this | |
856 | occurs inside double quotes. */ | |
857 | /* XXX -- this is very similar to extract_delimited_string -- XXX */ | |
726f6388 | 858 | static char * |
ccc6cda3 | 859 | extract_dollar_brace_string (string, sindex, quoted) |
726f6388 | 860 | char *string; |
ccc6cda3 | 861 | int *sindex, quoted; |
726f6388 | 862 | { |
ccc6cda3 JA |
863 | register int i, c, l; |
864 | int pass_character, nesting_level, si; | |
865 | char *result, *t; | |
726f6388 | 866 | |
ccc6cda3 | 867 | pass_character = 0; |
726f6388 | 868 | |
ccc6cda3 JA |
869 | nesting_level = 1; |
870 | ||
871 | for (i = *sindex; (c = string[i]); i++) | |
726f6388 | 872 | { |
ccc6cda3 | 873 | if (pass_character) |
726f6388 | 874 | { |
ccc6cda3 JA |
875 | pass_character = 0; |
876 | continue; | |
877 | } | |
726f6388 | 878 | |
cce855bc JA |
879 | /* CTLESCs and backslashes quote the next character. */ |
880 | if (c == CTLESC || c == '\\') | |
726f6388 | 881 | { |
ccc6cda3 | 882 | pass_character++; |
726f6388 JA |
883 | continue; |
884 | } | |
885 | ||
cce855bc | 886 | if (string[i] == '$' && string[i+1] == LBRACE) |
726f6388 | 887 | { |
ccc6cda3 JA |
888 | nesting_level++; |
889 | i++; | |
726f6388 JA |
890 | continue; |
891 | } | |
892 | ||
cce855bc | 893 | if (c == RBRACE) |
726f6388 | 894 | { |
ccc6cda3 JA |
895 | nesting_level--; |
896 | if (nesting_level == 0) | |
897 | break; | |
726f6388 JA |
898 | continue; |
899 | } | |
900 | ||
ccc6cda3 JA |
901 | /* Pass the contents of old-style command substitutions through |
902 | verbatim. */ | |
903 | if (c == '`') | |
726f6388 | 904 | { |
ccc6cda3 JA |
905 | si = i + 1; |
906 | t = string_extract (string, &si, "`", 0); | |
907 | i = si; | |
908 | free (t); | |
909 | continue; | |
910 | } | |
726f6388 | 911 | |
cce855bc JA |
912 | /* Pass the contents of new-style command substitutions and |
913 | arithmetic substitutions through verbatim. */ | |
914 | if (string[i] == '$' && string[i+1] == LPAREN) | |
ccc6cda3 | 915 | { |
726f6388 | 916 | si = i + 2; |
cce855bc | 917 | t = extract_delimited_string (string, &si, "$(", "(", ")"); /*)*/ |
726f6388 | 918 | i = si; |
ccc6cda3 | 919 | free (t); |
726f6388 JA |
920 | continue; |
921 | } | |
922 | ||
cce855bc JA |
923 | /* Pass the contents of single-quoted and double-quoted strings |
924 | through verbatim. */ | |
925 | if (c == '\'' || c == '"') | |
ccc6cda3 JA |
926 | { |
927 | si = i + 1; | |
cce855bc JA |
928 | i = (c == '\'') ? skip_single_quoted (string, si) |
929 | : skip_double_quoted (string, si); | |
930 | /* skip_XXX_quoted leaves index one past close quote */ | |
ccc6cda3 JA |
931 | i--; |
932 | continue; | |
933 | } | |
cce855bc | 934 | } |
726f6388 | 935 | |
b72432fd | 936 | if (c == 0 && nesting_level && doing_completion == 0) |
cce855bc JA |
937 | { |
938 | report_error ("bad substitution: no ending `}' in %s", string); | |
939 | jump_to_top_level (DISCARD); | |
726f6388 | 940 | } |
726f6388 | 941 | |
ccc6cda3 JA |
942 | l = i - *sindex; |
943 | result = xmalloc (1 + l); | |
944 | strncpy (result, string + *sindex, l); | |
945 | result[l] = '\0'; | |
726f6388 JA |
946 | *sindex = i; |
947 | ||
ccc6cda3 | 948 | return (result); |
726f6388 JA |
949 | } |
950 | ||
ccc6cda3 JA |
951 | /* Remove backslashes which are quoting backquotes from STRING. Modifies |
952 | STRING, and returns a pointer to it. */ | |
953 | char * | |
954 | de_backslash (string) | |
726f6388 | 955 | char *string; |
ccc6cda3 JA |
956 | { |
957 | register int i, l; | |
726f6388 | 958 | |
ccc6cda3 JA |
959 | for (i = 0, l = strlen (string); i < l; i++) |
960 | if (string[i] == '\\' && (string[i + 1] == '`' || string[i + 1] == '\\' || | |
961 | string[i + 1] == '$')) | |
962 | strcpy (string + i, string + i + 1); /* XXX - should be memmove */ | |
963 | return (string); | |
964 | } | |
726f6388 | 965 | |
ccc6cda3 | 966 | #if 0 |
cce855bc | 967 | /*UNUSED*/ |
ccc6cda3 JA |
968 | /* Replace instances of \! in a string with !. */ |
969 | void | |
970 | unquote_bang (string) | |
971 | char *string; | |
972 | { | |
973 | register int i, j; | |
974 | register char *temp; | |
726f6388 | 975 | |
ccc6cda3 | 976 | temp = xmalloc (1 + strlen (string)); |
726f6388 | 977 | |
ccc6cda3 JA |
978 | for (i = 0, j = 0; (temp[j] = string[i]); i++, j++) |
979 | { | |
980 | if (string[i] == '\\' && string[i + 1] == '!') | |
981 | { | |
982 | temp[j] = '!'; | |
983 | i++; | |
984 | } | |
985 | } | |
986 | strcpy (string, temp); | |
987 | free (temp); | |
726f6388 | 988 | } |
ccc6cda3 | 989 | #endif |
726f6388 | 990 | |
ccc6cda3 | 991 | #if defined (READLINE) |
726f6388 JA |
992 | /* Return 1 if the portion of STRING ending at EINDEX is quoted (there is |
993 | an unclosed quoted string), or if the character at EINDEX is quoted | |
b72432fd JA |
994 | by a backslash. DOING_COMPLETION is used to flag that the various |
995 | single and double-quoted string parsing functions should not return an | |
996 | error if there are unclosed quotes or braces. */ | |
997 | ||
998 | #define CQ_RETURN(x) do { doing_completion = 0; return (x); } while (0) | |
999 | ||
726f6388 JA |
1000 | int |
1001 | char_is_quoted (string, eindex) | |
1002 | char *string; | |
1003 | int eindex; | |
1004 | { | |
1005 | int i, pass_next, quoted; | |
726f6388 | 1006 | |
b72432fd | 1007 | doing_completion = 1; |
726f6388 JA |
1008 | for (i = pass_next = quoted = 0; i <= eindex; i++) |
1009 | { | |
1010 | if (pass_next) | |
1011 | { | |
1012 | pass_next = 0; | |
1013 | if (i >= eindex) /* XXX was if (i >= eindex - 1) */ | |
b72432fd | 1014 | CQ_RETURN(1); |
726f6388 JA |
1015 | continue; |
1016 | } | |
ccc6cda3 JA |
1017 | else if (string[i] == '\'' || string[i] == '"') |
1018 | { | |
1019 | i = (string[i] == '\'') ? skip_single_quoted (string, ++i) | |
1020 | : skip_double_quoted (string, ++i); | |
1021 | if (i > eindex) | |
b72432fd | 1022 | CQ_RETURN(1); |
ccc6cda3 JA |
1023 | i--; /* the skip functions increment past the closing quote. */ |
1024 | } | |
726f6388 | 1025 | else if (string[i] == '\\') |
ccc6cda3 JA |
1026 | { |
1027 | pass_next = 1; | |
1028 | continue; | |
1029 | } | |
726f6388 | 1030 | } |
b72432fd | 1031 | CQ_RETURN(0); |
726f6388 JA |
1032 | } |
1033 | ||
726f6388 JA |
1034 | int |
1035 | unclosed_pair (string, eindex, openstr) | |
1036 | char *string; | |
1037 | int eindex; | |
1038 | char *openstr; | |
1039 | { | |
ccc6cda3 | 1040 | int i, pass_next, openc, olen; |
726f6388 JA |
1041 | |
1042 | olen = strlen (openstr); | |
1043 | for (i = pass_next = openc = 0; i <= eindex; i++) | |
1044 | { | |
1045 | if (pass_next) | |
1046 | { | |
1047 | pass_next = 0; | |
1048 | if (i >= eindex) /* XXX was if (i >= eindex - 1) */ | |
1049 | return 0; | |
1050 | continue; | |
1051 | } | |
1052 | else if (STREQN (string + i, openstr, olen)) | |
1053 | { | |
1054 | openc = 1 - openc; | |
1055 | i += olen - 1; | |
1056 | } | |
ccc6cda3 | 1057 | else if (string[i] == '\'' || string[i] == '"') |
726f6388 | 1058 | { |
ccc6cda3 JA |
1059 | i = (string[i] == '\'') ? skip_single_quoted (string, i) |
1060 | : skip_double_quoted (string, i); | |
726f6388 JA |
1061 | if (i > eindex) |
1062 | return 0; | |
1063 | } | |
1064 | else if (string[i] == '\\') | |
1065 | { | |
1066 | pass_next = 1; | |
1067 | continue; | |
1068 | } | |
1069 | } | |
1070 | return (openc); | |
1071 | } | |
1072 | #endif /* READLINE */ | |
1073 | ||
ccc6cda3 JA |
1074 | #if 0 |
1075 | /* UNUSED */ | |
726f6388 JA |
1076 | /* Extract the name of the variable to bind to from the assignment string. */ |
1077 | char * | |
1078 | assignment_name (string) | |
1079 | char *string; | |
1080 | { | |
ccc6cda3 | 1081 | int offset; |
726f6388 JA |
1082 | char *temp; |
1083 | ||
ccc6cda3 JA |
1084 | offset = assignment (string); |
1085 | if (offset == 0) | |
726f6388 JA |
1086 | return (char *)NULL; |
1087 | temp = xmalloc (offset + 1); | |
1088 | strncpy (temp, string, offset); | |
1089 | temp[offset] = '\0'; | |
1090 | return (temp); | |
1091 | } | |
ccc6cda3 | 1092 | #endif |
726f6388 | 1093 | |
cce855bc JA |
1094 | /* **************************************************************** */ |
1095 | /* */ | |
1096 | /* Functions to convert strings to WORD_LISTs and vice versa */ | |
1097 | /* */ | |
1098 | /* **************************************************************** */ | |
1099 | ||
726f6388 JA |
1100 | /* Return a single string of all the words in LIST. SEP is the separator |
1101 | to put between individual elements of LIST in the output string. */ | |
1102 | static char * | |
1103 | string_list_internal (list, sep) | |
1104 | WORD_LIST *list; | |
1105 | char *sep; | |
1106 | { | |
1107 | register WORD_LIST *t; | |
1108 | char *result, *r; | |
1109 | int word_len, sep_len, result_size; | |
1110 | ||
ccc6cda3 | 1111 | if (list == 0) |
726f6388 JA |
1112 | return ((char *)NULL); |
1113 | ||
1114 | /* This is nearly always called with either sep[0] == 0 or sep[1] == 0. */ | |
1115 | sep_len = STRLEN (sep); | |
1116 | result_size = 0; | |
1117 | ||
1118 | for (t = list; t; t = t->next) | |
1119 | { | |
1120 | if (t != list) | |
1121 | result_size += sep_len; | |
1122 | result_size += strlen (t->word->word); | |
1123 | } | |
1124 | ||
1125 | r = result = xmalloc (result_size + 1); | |
1126 | ||
1127 | for (t = list; t; t = t->next) | |
1128 | { | |
1129 | if (t != list && sep_len) | |
1130 | { | |
ccc6cda3 JA |
1131 | if (sep_len > 1) |
1132 | { | |
1133 | FASTCOPY (sep, r, sep_len); | |
1134 | r += sep_len; | |
1135 | } | |
1136 | else | |
1137 | *r++ = sep[0]; | |
726f6388 JA |
1138 | } |
1139 | ||
1140 | word_len = strlen (t->word->word); | |
1141 | FASTCOPY (t->word->word, r, word_len); | |
1142 | r += word_len; | |
1143 | } | |
1144 | ||
ccc6cda3 | 1145 | *r = '\0'; |
726f6388 JA |
1146 | return (result); |
1147 | } | |
1148 | ||
1149 | /* Return a single string of all the words present in LIST, separating | |
1150 | each word with a space. */ | |
1151 | char * | |
1152 | string_list (list) | |
1153 | WORD_LIST *list; | |
1154 | { | |
1155 | return (string_list_internal (list, " ")); | |
1156 | } | |
1157 | ||
1158 | /* Return a single string of all the words present in LIST, obeying the | |
1159 | quoting rules for "$*", to wit: (P1003.2, draft 11, 3.5.2) "If the | |
1160 | expansion [of $*] appears within a double quoted string, it expands | |
1161 | to a single field with the value of each parameter separated by the | |
1162 | first character of the IFS variable, or by a <space> if IFS is unset." */ | |
cce855bc | 1163 | static char * |
726f6388 JA |
1164 | string_list_dollar_star (list) |
1165 | WORD_LIST *list; | |
1166 | { | |
ccc6cda3 | 1167 | char *ifs, sep[2]; |
726f6388 | 1168 | |
ccc6cda3 | 1169 | ifs = get_string_value ("IFS"); |
726f6388 | 1170 | |
cce855bc | 1171 | sep[0] = (ifs == 0) ? ' ' : *ifs; |
726f6388 JA |
1172 | sep[1] = '\0'; |
1173 | ||
1174 | return (string_list_internal (list, sep)); | |
1175 | } | |
1176 | ||
cce855bc JA |
1177 | /* Turn $@ into a string. If (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) |
1178 | is non-zero, the $@ appears within double quotes, and we should quote | |
1179 | the list before converting it into a string. If IFS is unset, and the | |
1180 | word is not quoted, we just need to quote CTLESC and CTLNUL characters | |
1181 | in the words in the list, because the default value of $IFS is | |
1182 | <space><tab><newline>, IFS characters in the words in the list should | |
1183 | also be split. If IFS is null, and the word is not quoted, we need | |
1184 | to quote the words in the list to preserve the positional parameters | |
1185 | exactly. */ | |
1186 | static char * | |
1187 | string_list_dollar_at (list, quoted) | |
1188 | WORD_LIST *list; | |
1189 | int quoted; | |
1190 | { | |
1191 | char *ifs, sep[2]; | |
1192 | WORD_LIST *tlist; | |
1193 | ||
1194 | ifs = get_string_value ("IFS"); | |
1195 | ||
1196 | sep[0] = (ifs == 0 || *ifs == 0) ? ' ' : *ifs; | |
1197 | sep[1] = '\0'; | |
1198 | ||
1199 | tlist = ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || (ifs && *ifs == 0)) | |
1200 | ? quote_list (list) | |
1201 | : list_quote_escapes (list); | |
1202 | return (string_list_internal (tlist, sep)); | |
1203 | } | |
1204 | ||
726f6388 JA |
1205 | /* Return the list of words present in STRING. Separate the string into |
1206 | words at any of the characters found in SEPARATORS. If QUOTED is | |
1207 | non-zero then word in the list will have its quoted flag set, otherwise | |
1208 | the quoted flag is left as make_word () deemed fit. | |
1209 | ||
1210 | This obeys the P1003.2 word splitting semantics. If `separators' is | |
1211 | exactly <space><tab><newline>, then the splitting algorithm is that of | |
1212 | the Bourne shell, which treats any sequence of characters from `separators' | |
1213 | as a delimiter. If IFS is unset, which results in `separators' being set | |
1214 | to "", no splitting occurs. If separators has some other value, the | |
1215 | following rules are applied (`IFS white space' means zero or more | |
1216 | occurrences of <space>, <tab>, or <newline>, as long as those characters | |
1217 | are in `separators'): | |
1218 | ||
1219 | 1) IFS white space is ignored at the start and the end of the | |
1220 | string. | |
1221 | 2) Each occurrence of a character in `separators' that is not | |
1222 | IFS white space, along with any adjacent occurrences of | |
1223 | IFS white space delimits a field. | |
1224 | 3) Any nonzero-length sequence of IFS white space delimits a field. | |
1225 | */ | |
1226 | ||
1227 | /* BEWARE! list_string strips null arguments. Don't call it twice and | |
1228 | expect to have "" preserved! */ | |
1229 | ||
726f6388 JA |
1230 | /* This performs word splitting and quoted null character removal on |
1231 | STRING. */ | |
726f6388 JA |
1232 | #define issep(c) (member ((c), separators)) |
1233 | ||
1234 | WORD_LIST * | |
1235 | list_string (string, separators, quoted) | |
1236 | register char *string, *separators; | |
1237 | int quoted; | |
1238 | { | |
ccc6cda3 JA |
1239 | WORD_LIST *result; |
1240 | WORD_DESC *t; | |
1241 | char *current_word, *s; | |
1242 | int sindex, sh_style_split; | |
726f6388 JA |
1243 | |
1244 | if (!string || !*string) | |
1245 | return ((WORD_LIST *)NULL); | |
1246 | ||
1247 | sh_style_split = | |
1248 | separators && *separators && (STREQ (separators, " \t\n")); | |
1249 | ||
1250 | /* Remove sequences of whitespace at the beginning of STRING, as | |
1251 | long as those characters appear in IFS. Do not do this if | |
1252 | STRING is quoted or if there are no separator characters. */ | |
1253 | if (!quoted || !separators || !*separators) | |
1254 | { | |
1255 | for (s = string; *s && spctabnl (*s) && issep (*s); s++); | |
1256 | ||
1257 | if (!*s) | |
1258 | return ((WORD_LIST *)NULL); | |
1259 | ||
1260 | string = s; | |
1261 | } | |
1262 | ||
1263 | /* OK, now STRING points to a word that does not begin with white space. | |
1264 | The splitting algorithm is: | |
1265 | extract a word, stopping at a separator | |
1266 | skip sequences of spc, tab, or nl as long as they are separators | |
1267 | This obeys the field splitting rules in Posix.2. */ | |
ccc6cda3 | 1268 | for (result = (WORD_LIST *)NULL, sindex = 0; string[sindex]; ) |
726f6388 JA |
1269 | { |
1270 | current_word = string_extract_verbatim (string, &sindex, separators); | |
ccc6cda3 | 1271 | if (current_word == 0) |
726f6388 JA |
1272 | break; |
1273 | ||
1274 | /* If we have a quoted empty string, add a quoted null argument. We | |
1275 | want to preserve the quoted null character iff this is a quoted | |
1276 | empty string; otherwise the quoted null characters are removed | |
1277 | below. */ | |
1278 | if (QUOTED_NULL (current_word)) | |
1279 | { | |
ccc6cda3 JA |
1280 | t = make_bare_word (""); |
1281 | t->flags |= W_QUOTED; | |
726f6388 JA |
1282 | free (t->word); |
1283 | t->word = make_quoted_char ('\0'); | |
1284 | result = make_word_list (t, result); | |
1285 | } | |
ccc6cda3 | 1286 | else if (current_word[0] != '\0') |
726f6388 JA |
1287 | { |
1288 | /* If we have something, then add it regardless. However, | |
1289 | perform quoted null character removal on the current word. */ | |
1290 | remove_quoted_nulls (current_word); | |
cce855bc | 1291 | #if 0 |
726f6388 | 1292 | result = make_word_list (make_word (current_word), result); |
cce855bc JA |
1293 | #else |
1294 | result = add_string_to_list (current_word, result); | |
1295 | #endif | |
ccc6cda3 JA |
1296 | if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) |
1297 | result->word->flags |= W_QUOTED; | |
726f6388 JA |
1298 | } |
1299 | ||
1300 | /* If we're not doing sequences of separators in the traditional | |
1301 | Bourne shell style, then add a quoted null argument. */ | |
726f6388 JA |
1302 | else if (!sh_style_split && !spctabnl (string[sindex])) |
1303 | { | |
ccc6cda3 JA |
1304 | t = make_bare_word (""); |
1305 | t->flags |= W_QUOTED; | |
1306 | free (t->word); | |
1307 | t->word = make_quoted_char ('\0'); | |
1308 | result = make_word_list (t, result); | |
726f6388 JA |
1309 | } |
1310 | ||
1311 | free (current_word); | |
1312 | ||
1313 | /* Move past the current separator character. */ | |
1314 | if (string[sindex]) | |
1315 | sindex++; | |
1316 | ||
1317 | /* Now skip sequences of space, tab, or newline characters if they are | |
1318 | in the list of separators. */ | |
1319 | while (string[sindex] && spctabnl (string[sindex]) && issep (string[sindex])) | |
1320 | sindex++; | |
726f6388 JA |
1321 | } |
1322 | return (REVERSE_LIST (result, WORD_LIST *)); | |
1323 | } | |
1324 | ||
1325 | /* Parse a single word from STRING, using SEPARATORS to separate fields. | |
1326 | ENDPTR is set to the first character after the word. This is used by | |
1327 | the `read' builtin. | |
1328 | XXX - this function is very similar to list_string; they should be | |
1329 | combined - XXX */ | |
1330 | char * | |
1331 | get_word_from_string (stringp, separators, endptr) | |
1332 | char **stringp, *separators, **endptr; | |
1333 | { | |
1334 | register char *s; | |
1335 | char *current_word; | |
1336 | int sindex, sh_style_split; | |
1337 | ||
1338 | if (!stringp || !*stringp || !**stringp) | |
1339 | return ((char *)NULL); | |
ccc6cda3 | 1340 | |
726f6388 JA |
1341 | s = *stringp; |
1342 | ||
1343 | sh_style_split = | |
1344 | separators && *separators && (STREQ (separators, " \t\n")); | |
1345 | ||
1346 | /* Remove sequences of whitespace at the beginning of STRING, as | |
1347 | long as those characters appear in IFS. */ | |
1348 | if (sh_style_split || !separators || !*separators) | |
1349 | { | |
1350 | for (; *s && spctabnl (*s) && issep (*s); s++); | |
1351 | ||
1352 | /* If the string is nothing but whitespace, update it and return. */ | |
1353 | if (!*s) | |
1354 | { | |
1355 | *stringp = s; | |
1356 | if (endptr) | |
1357 | *endptr = s; | |
1358 | return ((char *)NULL); | |
1359 | } | |
1360 | } | |
1361 | ||
1362 | /* OK, S points to a word that does not begin with white space. | |
1363 | Now extract a word, stopping at a separator, save a pointer to | |
1364 | the first character after the word, then skip sequences of spc, | |
1365 | tab, or nl as long as they are separators. | |
ccc6cda3 | 1366 | |
726f6388 JA |
1367 | This obeys the field splitting rules in Posix.2. */ |
1368 | sindex = 0; | |
1369 | current_word = string_extract_verbatim (s, &sindex, separators); | |
1370 | ||
1371 | /* Set ENDPTR to the first character after the end of the word. */ | |
1372 | if (endptr) | |
1373 | *endptr = s + sindex; | |
1374 | ||
1375 | /* Move past the current separator character. */ | |
1376 | if (s[sindex]) | |
1377 | sindex++; | |
1378 | ||
1379 | /* Now skip sequences of space, tab, or newline characters if they are | |
1380 | in the list of separators. */ | |
1381 | while (s[sindex] && spctabnl (s[sindex]) && issep (s[sindex])) | |
1382 | sindex++; | |
1383 | ||
1384 | /* Update STRING to point to the next field. */ | |
1385 | *stringp = s + sindex; | |
1386 | return (current_word); | |
1387 | } | |
1388 | ||
1389 | /* Remove IFS white space at the end of STRING. Start at the end | |
1390 | of the string and walk backwards until the beginning of the string | |
1391 | or we find a character that's not IFS white space and not CTLESC. | |
1392 | Only let CTLESC escape a white space character if SAW_ESCAPE is | |
1393 | non-zero. */ | |
1394 | char * | |
1395 | strip_trailing_ifs_whitespace (string, separators, saw_escape) | |
1396 | char *string, *separators; | |
1397 | int saw_escape; | |
1398 | { | |
1399 | char *s; | |
ccc6cda3 | 1400 | |
726f6388 JA |
1401 | s = string + STRLEN (string) - 1; |
1402 | while (s > string && ((spctabnl (*s) && issep (*s)) || | |
1403 | (saw_escape && *s == CTLESC && spctabnl (s[1])))) | |
1404 | s--; | |
1405 | *++s = '\0'; | |
1406 | return string; | |
1407 | } | |
1408 | ||
ccc6cda3 JA |
1409 | #if defined (ARRAY_VARS) |
1410 | WORD_LIST * | |
1411 | list_string_with_quotes (string) | |
1412 | char *string; | |
1413 | { | |
1414 | WORD_LIST *list; | |
1415 | char *token, *s; | |
1416 | int c, i, tokstart, len; | |
1417 | ||
1418 | for (s = string; s && *s && spctabnl (*s); s++) | |
1419 | ; | |
1420 | if (s == 0 || *s == 0) | |
1421 | return ((WORD_LIST *)NULL); | |
1422 | ||
1423 | tokstart = i = 0; | |
1424 | list = (WORD_LIST *)NULL; | |
1425 | while (1) | |
1426 | { | |
1427 | c = s[i]; | |
1428 | if (c == '\\') | |
1429 | { | |
1430 | i++; | |
1431 | if (s[i]) | |
1432 | i++; | |
1433 | } | |
1434 | else if (c == '\'') | |
1435 | i = skip_single_quoted (s, ++i); | |
1436 | else if (c == '"') | |
1437 | i = skip_double_quoted (s, ++i); | |
1438 | else if (c == 0 || spctabnl (c)) | |
1439 | { | |
1440 | /* We have found the end of a token. Make a word out of it and | |
1441 | add it to the word list. */ | |
1442 | len = i - tokstart; | |
1443 | token = xmalloc (len + 1); | |
1444 | strncpy (token, s + tokstart, len); | |
1445 | token[len] = '\0'; | |
cce855bc | 1446 | #if 0 |
ccc6cda3 | 1447 | list = make_word_list (make_word (token), list); |
cce855bc JA |
1448 | #else |
1449 | list = add_string_to_list (token, list); | |
1450 | #endif | |
ccc6cda3 JA |
1451 | free (token); |
1452 | while (spctabnl (s[i])) | |
1453 | i++; | |
1454 | if (s[i]) | |
1455 | tokstart = i; | |
1456 | else | |
1457 | break; | |
1458 | } | |
1459 | else | |
1460 | i++; /* normal character */ | |
1461 | } | |
1462 | return (REVERSE_LIST (list, WORD_LIST *)); | |
1463 | } | |
1464 | #endif /* ARRAY_VARS */ | |
d166f048 | 1465 | |
cce855bc JA |
1466 | /********************************************************/ |
1467 | /* */ | |
1468 | /* Functions to perform assignment statements */ | |
1469 | /* */ | |
1470 | /********************************************************/ | |
d166f048 | 1471 | |
ccc6cda3 JA |
1472 | #if defined (ARRAY_VARS) |
1473 | SHELL_VAR * | |
1474 | do_array_element_assignment (name, value) | |
1475 | char *name, *value; | |
1476 | { | |
1477 | char *t; | |
1478 | int ind, ni; | |
1479 | SHELL_VAR *entry; | |
1480 | ||
1481 | t = strchr (name, '['); | |
1482 | if (t == 0) | |
1483 | return ((SHELL_VAR *)NULL); | |
1484 | ind = t - name; | |
1485 | ni = skipsubscript (name, ind); | |
1486 | if ((ALL_ELEMENT_SUB (t[1]) && t[2] == ']') || (ni <= ind + 1)) | |
1487 | { | |
1488 | report_error ("%s: bad array subscript", name); | |
1489 | return ((SHELL_VAR *)NULL); | |
1490 | } | |
1491 | *t++ = '\0'; | |
1492 | ind = array_expand_index (t, ni - ind); | |
1493 | if (ind < 0) | |
1494 | { | |
1495 | t[-1] = '['; /* restore original name */ | |
1496 | report_error ("%s: bad array subscript", name); | |
1497 | return ((SHELL_VAR *)NULL); | |
1498 | } | |
1499 | entry = bind_array_variable (name, ind, value); | |
1500 | t[-1] = '['; /* restore original name */ | |
1501 | return (entry); | |
1502 | } | |
1503 | #endif /* ARRAY_VARS */ | |
1504 | ||
726f6388 JA |
1505 | /* Given STRING, an assignment string, get the value of the right side |
1506 | of the `=', and bind it to the left side. If EXPAND is true, then | |
1507 | perform parameter expansion, command substitution, and arithmetic | |
1508 | expansion on the right-hand side. Perform tilde expansion in any | |
1509 | case. Do not perform word splitting on the result of expansion. */ | |
1510 | static int | |
1511 | do_assignment_internal (string, expand) | |
1512 | char *string; | |
1513 | int expand; | |
1514 | { | |
ccc6cda3 JA |
1515 | int offset; |
1516 | char *name, *value; | |
1517 | SHELL_VAR *entry; | |
1518 | #if defined (ARRAY_VARS) | |
1519 | char *t; | |
1520 | int ni, assign_list = 0; | |
1521 | #endif | |
1522 | ||
1523 | offset = assignment (string); | |
1524 | name = savestring (string); | |
1525 | value = (char *)NULL; | |
726f6388 JA |
1526 | |
1527 | if (name[offset] == '=') | |
1528 | { | |
1529 | char *temp; | |
1530 | ||
1531 | name[offset] = 0; | |
1532 | temp = name + offset + 1; | |
1533 | ||
ccc6cda3 | 1534 | #if defined (ARRAY_VARS) |
cce855bc | 1535 | if (expand && temp[0] == LPAREN && strchr (temp, RPAREN)) |
726f6388 | 1536 | { |
ccc6cda3 JA |
1537 | assign_list = ni = 1; |
1538 | value = extract_delimited_string (temp, &ni, "(", (char *)NULL, ")"); | |
1539 | } | |
1540 | else | |
1541 | #endif | |
1542 | ||
1543 | /* Perform tilde expansion. */ | |
1544 | if (expand && temp[0]) | |
1545 | { | |
1546 | temp = (strchr (temp, '~') && unquoted_member ('~', temp)) | |
1547 | ? bash_tilde_expand (temp) | |
1548 | : savestring (temp); | |
726f6388 JA |
1549 | |
1550 | value = maybe_expand_string (temp, 0, expand_string_unsplit); | |
1551 | free (temp); | |
1552 | } | |
1553 | else | |
1554 | value = savestring (temp); | |
1555 | } | |
1556 | ||
1557 | if (value == 0) | |
d166f048 JA |
1558 | { |
1559 | value = xmalloc (1); | |
1560 | value[0] = '\0'; | |
1561 | } | |
726f6388 | 1562 | |
726f6388 | 1563 | if (echo_command_at_execute) |
ccc6cda3 JA |
1564 | #if defined (ARRAY_VARS) |
1565 | if (assign_list) | |
1566 | fprintf (stderr, "%s%s=(%s)\n", indirection_level_string (), name, value); | |
1567 | else | |
1568 | #endif | |
726f6388 JA |
1569 | fprintf (stderr, "%s%s=%s\n", indirection_level_string (), name, value); |
1570 | ||
d166f048 | 1571 | #define ASSIGN_RETURN(r) do { FREE (value); free (name); return (r); } while (0) |
ccc6cda3 JA |
1572 | |
1573 | #if defined (ARRAY_VARS) | |
1574 | if (t = strchr (name, '[')) | |
1575 | { | |
1576 | if (assign_list) | |
1577 | { | |
1578 | report_error ("%s: cannot assign list to array member", name); | |
1579 | ASSIGN_RETURN (0); | |
1580 | } | |
1581 | entry = do_array_element_assignment (name, value); | |
1582 | if (entry == 0) | |
1583 | ASSIGN_RETURN (0); | |
1584 | } | |
1585 | else if (assign_list) | |
1586 | entry = assign_array_from_string (name, value); | |
1587 | else | |
1588 | #endif /* ARRAY_VARS */ | |
1589 | entry = bind_variable (name, value); | |
1590 | ||
726f6388 JA |
1591 | stupidly_hack_special_variables (name); |
1592 | ||
1593 | if (entry) | |
1594 | entry->attributes &= ~att_invisible; | |
1595 | ||
726f6388 | 1596 | /* Return 1 if the assignment seems to have been performed correctly. */ |
ccc6cda3 | 1597 | ASSIGN_RETURN (entry ? ((entry->attributes & att_readonly) == 0) : 0); |
726f6388 JA |
1598 | } |
1599 | ||
1600 | /* Perform the assignment statement in STRING, and expand the | |
1601 | right side by doing command and parameter expansion. */ | |
ccc6cda3 | 1602 | int |
726f6388 JA |
1603 | do_assignment (string) |
1604 | char *string; | |
1605 | { | |
1606 | return do_assignment_internal (string, 1); | |
1607 | } | |
1608 | ||
1609 | /* Given STRING, an assignment string, get the value of the right side | |
1610 | of the `=', and bind it to the left side. Do not do command and | |
1611 | parameter substitution on the right hand side. */ | |
ccc6cda3 | 1612 | int |
726f6388 JA |
1613 | do_assignment_no_expand (string) |
1614 | char *string; | |
1615 | { | |
1616 | return do_assignment_internal (string, 0); | |
1617 | } | |
1618 | ||
cce855bc JA |
1619 | /*************************************************** |
1620 | * * | |
1621 | * Functions to manage the positional parameters * | |
1622 | * * | |
1623 | ***************************************************/ | |
726f6388 JA |
1624 | |
1625 | /* Return the word list that corresponds to `$*'. */ | |
1626 | WORD_LIST * | |
1627 | list_rest_of_args () | |
1628 | { | |
ccc6cda3 | 1629 | register WORD_LIST *list, *args; |
726f6388 JA |
1630 | int i; |
1631 | ||
1632 | /* Break out of the loop as soon as one of the dollar variables is null. */ | |
ccc6cda3 JA |
1633 | for (i = 1, list = (WORD_LIST *)NULL; i < 10 && dollar_vars[i]; i++) |
1634 | list = make_word_list (make_bare_word (dollar_vars[i]), list); | |
1635 | ||
1636 | for (args = rest_of_args; args; args = args->next) | |
1637 | list = make_word_list (make_bare_word (args->word->word), list); | |
726f6388 | 1638 | |
726f6388 JA |
1639 | return (REVERSE_LIST (list, WORD_LIST *)); |
1640 | } | |
1641 | ||
ccc6cda3 JA |
1642 | int |
1643 | number_of_args () | |
1644 | { | |
1645 | register WORD_LIST *list; | |
1646 | int n; | |
1647 | ||
1648 | for (n = 0; n < 9 && dollar_vars[n+1]; n++) | |
1649 | ; | |
1650 | for (list = rest_of_args; list; list = list->next) | |
1651 | n++; | |
1652 | return n; | |
1653 | } | |
1654 | ||
cce855bc JA |
1655 | /* Return the value of a positional parameter. This handles values > 10. */ |
1656 | char * | |
1657 | get_dollar_var_value (ind) | |
1658 | int ind; | |
1659 | { | |
1660 | char *temp; | |
1661 | WORD_LIST *p; | |
1662 | ||
1663 | if (ind < 10) | |
1664 | temp = dollar_vars[ind] ? savestring (dollar_vars[ind]) : (char *)NULL; | |
1665 | else /* We want something like ${11} */ | |
1666 | { | |
1667 | ind -= 10; | |
1668 | for (p = rest_of_args; p && ind--; p = p->next) | |
1669 | ; | |
1670 | temp = p ? savestring (p->word->word) : (char *)NULL; | |
1671 | } | |
1672 | return (temp); | |
1673 | } | |
1674 | ||
726f6388 JA |
1675 | /* Make a single large string out of the dollar digit variables, |
1676 | and the rest_of_args. If DOLLAR_STAR is 1, then obey the special | |
1677 | case of "$*" with respect to IFS. */ | |
1678 | char * | |
1679 | string_rest_of_args (dollar_star) | |
1680 | int dollar_star; | |
1681 | { | |
ccc6cda3 | 1682 | register WORD_LIST *list; |
726f6388 JA |
1683 | char *string; |
1684 | ||
ccc6cda3 | 1685 | list = list_rest_of_args (); |
726f6388 JA |
1686 | string = dollar_star ? string_list_dollar_star (list) : string_list (list); |
1687 | dispose_words (list); | |
1688 | return (string); | |
1689 | } | |
1690 | ||
cce855bc JA |
1691 | /* Return a string containing the positional parameters from START to |
1692 | END, inclusive. If STRING[0] == '*', we obey the rules for $*, | |
1693 | which only makes a difference if QUOTED is non-zero. */ | |
1694 | static char * | |
1695 | pos_params (string, start, end, quoted) | |
1696 | char *string; | |
1697 | int start, end, quoted; | |
726f6388 | 1698 | { |
cce855bc JA |
1699 | WORD_LIST *save, *params, *h, *t; |
1700 | char *ret; | |
1701 | int i; | |
726f6388 | 1702 | |
cce855bc JA |
1703 | save = params = list_rest_of_args (); |
1704 | if (save == 0) | |
1705 | return ((char *)NULL); | |
1706 | ||
1707 | for (i = 1; params && i < start; i++) | |
1708 | params = params->next; | |
1709 | if (params == 0) | |
1710 | return ((char *)NULL); | |
1711 | for (h = t = params; params && i < end; i++) | |
d166f048 | 1712 | { |
cce855bc JA |
1713 | t = params; |
1714 | params = params->next; | |
d166f048 | 1715 | } |
726f6388 | 1716 | |
cce855bc JA |
1717 | t->next = (WORD_LIST *)NULL; |
1718 | if (string[0] == '*') | |
1719 | ret = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? string_list_dollar_star (h) : string_list (h); | |
1720 | else | |
1721 | ret = string_list ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? quote_list (h) : h); | |
1722 | t->next = params; | |
726f6388 | 1723 | |
cce855bc JA |
1724 | dispose_words (save); |
1725 | return (ret); | |
1726 | } | |
1727 | ||
1728 | /******************************************************************/ | |
1729 | /* */ | |
1730 | /* Functions to expand strings to strings or WORD_LISTs */ | |
1731 | /* */ | |
1732 | /******************************************************************/ | |
1733 | ||
1734 | #if defined (PROCESS_SUBSTITUTION) | |
1735 | #define EXP_CHAR(s) (s == '$' || s == '`' || s == '<' || s == '>' || s == CTLESC) | |
1736 | #else | |
1737 | #define EXP_CHAR(s) (s == '$' || s == '`' || s == CTLESC) | |
1738 | #endif | |
1739 | ||
1740 | /* If there are any characters in STRING that require full expansion, | |
1741 | then call FUNC to expand STRING; otherwise just perform quote | |
1742 | removal if necessary. This returns a new string. */ | |
1743 | static char * | |
1744 | maybe_expand_string (string, quoted, func) | |
1745 | char *string; | |
1746 | int quoted; | |
1747 | WORD_LIST *(*func)(); | |
1748 | { | |
1749 | WORD_LIST *list; | |
1750 | int i, saw_quote; | |
1751 | char *ret; | |
1752 | ||
1753 | for (i = saw_quote = 0; string[i]; i++) | |
1754 | { | |
1755 | if (EXP_CHAR (string[i])) | |
1756 | break; | |
1757 | else if (string[i] == '\'' || string[i] == '\\' || string[i] == '"') | |
1758 | saw_quote = 1; | |
1759 | } | |
1760 | ||
1761 | if (string[i]) | |
1762 | { | |
1763 | list = (*func) (string, quoted); | |
1764 | if (list) | |
1765 | { | |
1766 | ret = string_list (list); | |
1767 | dispose_words (list); | |
1768 | } | |
1769 | else | |
1770 | ret = (char *)NULL; | |
1771 | } | |
1772 | else if (saw_quote && ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) == 0)) | |
1773 | ret = string_quote_removal (string, quoted); | |
1774 | else | |
1775 | ret = savestring (string); | |
1776 | return ret; | |
1777 | } | |
1778 | ||
1779 | static inline char * | |
1780 | expand_string_to_string (string, quoted, func) | |
1781 | char *string; | |
1782 | int quoted; | |
1783 | WORD_LIST *(*func)(); | |
1784 | { | |
1785 | WORD_LIST *list; | |
1786 | char *ret; | |
1787 | ||
1788 | if (string == 0 || *string == '\0') | |
1789 | return ((char *)NULL); | |
1790 | ||
1791 | list = (*func) (string, quoted); | |
1792 | if (list) | |
1793 | { | |
1794 | ret = string_list (list); | |
1795 | dispose_words (list); | |
1796 | } | |
1797 | else | |
1798 | ret = (char *)NULL; | |
1799 | ||
1800 | return (ret); | |
1801 | } | |
1802 | ||
1803 | #if defined (COND_COMMAND) | |
1804 | /* Just remove backslashes in STRING. Returns a new string. */ | |
1805 | char * | |
1806 | remove_backslashes (string) | |
1807 | char *string; | |
1808 | { | |
1809 | char *r, *ret, *s; | |
1810 | ||
1811 | r = ret = xmalloc (strlen (string) + 1); | |
1812 | for (s = string; s && *s; ) | |
1813 | { | |
1814 | if (*s == '\\') | |
1815 | s++; | |
1816 | if (*s == 0) | |
1817 | break; | |
1818 | *r++ = *s++; | |
1819 | } | |
1820 | *r = '\0'; | |
1821 | return ret; | |
1822 | } | |
1823 | ||
1824 | /* This needs better error handling. */ | |
1825 | /* Expand W for use as an argument to a unary or binary operator in a | |
1826 | [[...]] expression. If SPECIAL is nonzero, this is the rhs argument | |
1827 | to the != or == operator, and should be treated as a pattern. In | |
1828 | this case, we quote the string specially for the globbing code. The | |
1829 | caller is responsible for removing the backslashes if the unquoted | |
1830 | words is needed later. */ | |
1831 | char * | |
1832 | cond_expand_word (w, special) | |
1833 | WORD_DESC *w; | |
1834 | int special; | |
1835 | { | |
1836 | char *r, *p; | |
1837 | WORD_LIST *l; | |
1838 | ||
1839 | if (w->word == 0 || w->word[0] == '\0') | |
1840 | return ((char *)NULL); | |
1841 | ||
b72432fd | 1842 | l = call_expand_word_internal (w, 0, 0, (int *)0, (int *)0); |
cce855bc JA |
1843 | if (l) |
1844 | { | |
1845 | if (special == 0) | |
1846 | { | |
1847 | dequote_list (l); | |
1848 | r = string_list (l); | |
1849 | } | |
1850 | else | |
1851 | { | |
1852 | p = string_list (l); | |
1853 | r = quote_string_for_globbing (p, QGLOB_CVTNULL); | |
1854 | free (p); | |
1855 | } | |
1856 | dispose_words (l); | |
1857 | } | |
1858 | else | |
1859 | r = (char *)NULL; | |
1860 | ||
1861 | return r; | |
1862 | } | |
1863 | #endif | |
1864 | ||
1865 | /* Call expand_word_internal to expand W and handle error returns. | |
1866 | A convenience function for functions that don't want to handle | |
1867 | any errors or free any memory before aborting. */ | |
1868 | static WORD_LIST * | |
b72432fd | 1869 | call_expand_word_internal (w, q, i, c, e) |
cce855bc | 1870 | WORD_DESC *w; |
b72432fd | 1871 | int q, i, *c, *e; |
cce855bc JA |
1872 | { |
1873 | WORD_LIST *result; | |
1874 | ||
b72432fd | 1875 | result = expand_word_internal (w, q, i, c, e); |
cce855bc JA |
1876 | if (result == &expand_word_error) |
1877 | { | |
1878 | /* By convention, each time this error is returned, w->word has | |
1879 | already been freed. */ | |
1880 | w->word = (char *)NULL; | |
1881 | jump_to_top_level (DISCARD); | |
1882 | /* NOTREACHED */ | |
1883 | } | |
1884 | else if (result == &expand_word_fatal) | |
1885 | jump_to_top_level (FORCE_EOF); | |
1886 | /* NOTREACHED */ | |
1887 | else | |
1888 | return (result); | |
1889 | } | |
1890 | ||
1891 | /* Perform parameter expansion, command substitution, and arithmetic | |
1892 | expansion on STRING, as if it were a word. Leave the result quoted. */ | |
1893 | static WORD_LIST * | |
1894 | expand_string_internal (string, quoted) | |
1895 | char *string; | |
1896 | int quoted; | |
1897 | { | |
1898 | WORD_DESC td; | |
1899 | WORD_LIST *tresult; | |
1900 | ||
1901 | if (string == 0 || *string == 0) | |
1902 | return ((WORD_LIST *)NULL); | |
1903 | ||
1904 | bzero ((char *)&td, sizeof (td)); | |
1905 | td.word = string; | |
b72432fd | 1906 | tresult = call_expand_word_internal (&td, quoted, 0, (int *)NULL, (int *)NULL); |
cce855bc | 1907 | return (tresult); |
726f6388 JA |
1908 | } |
1909 | ||
1910 | /* Expand STRING by performing parameter expansion, command substitution, | |
1911 | and arithmetic expansion. Dequote the resulting WORD_LIST before | |
1912 | returning it, but do not perform word splitting. The call to | |
1913 | remove_quoted_nulls () is in here because word splitting normally | |
1914 | takes care of quote removal. */ | |
1915 | WORD_LIST * | |
1916 | expand_string_unsplit (string, quoted) | |
1917 | char *string; | |
1918 | int quoted; | |
1919 | { | |
1920 | WORD_LIST *value; | |
1921 | ||
1922 | if (!string || !*string) | |
1923 | return ((WORD_LIST *)NULL); | |
1924 | ||
1925 | value = expand_string_internal (string, quoted); | |
1926 | if (value) | |
1927 | { | |
1928 | if (value->word) | |
1929 | remove_quoted_nulls (value->word->word); | |
1930 | dequote_list (value); | |
1931 | } | |
1932 | return (value); | |
1933 | } | |
1934 | ||
726f6388 JA |
1935 | /* Expand STRING just as if you were expanding a word, but do not dequote |
1936 | the resultant WORD_LIST. This is called only from within this file, | |
1937 | and is used to correctly preserve quoted characters when expanding | |
1938 | things like ${1+"$@"}. This does parameter expansion, command | |
b72432fd | 1939 | substitution, arithmetic expansion, and word splitting. */ |
726f6388 JA |
1940 | static WORD_LIST * |
1941 | expand_string_leave_quoted (string, quoted) | |
1942 | char *string; | |
1943 | int quoted; | |
1944 | { | |
1945 | WORD_LIST *tlist; | |
1946 | WORD_LIST *tresult; | |
1947 | ||
ccc6cda3 | 1948 | if (string == 0 || *string == '\0') |
726f6388 JA |
1949 | return ((WORD_LIST *)NULL); |
1950 | ||
1951 | tlist = expand_string_internal (string, quoted); | |
1952 | ||
1953 | if (tlist) | |
1954 | { | |
1955 | tresult = word_list_split (tlist); | |
1956 | dispose_words (tlist); | |
1957 | return (tresult); | |
1958 | } | |
1959 | return ((WORD_LIST *)NULL); | |
1960 | } | |
1961 | ||
ccc6cda3 JA |
1962 | /* This does not perform word splitting or dequote the WORD_LIST |
1963 | it returns. */ | |
1964 | static WORD_LIST * | |
1965 | expand_string_for_rhs (string, quoted, dollar_at_p, has_dollar_at) | |
1966 | char *string; | |
1967 | int quoted, *dollar_at_p, *has_dollar_at; | |
1968 | { | |
1969 | WORD_DESC td; | |
1970 | WORD_LIST *tresult; | |
1971 | ||
1972 | if (string == 0 || *string == '\0') | |
1973 | return (WORD_LIST *)NULL; | |
1974 | ||
d166f048 | 1975 | bzero ((char *)&td, sizeof (td)); |
ccc6cda3 | 1976 | td.word = string; |
b72432fd | 1977 | tresult = call_expand_word_internal (&td, quoted, 1, dollar_at_p, has_dollar_at); |
ccc6cda3 JA |
1978 | return (tresult); |
1979 | } | |
1980 | ||
726f6388 JA |
1981 | /* Expand STRING just as if you were expanding a word. This also returns |
1982 | a list of words. Note that filename globbing is *NOT* done for word | |
1983 | or string expansion, just when the shell is expanding a command. This | |
1984 | does parameter expansion, command substitution, arithmetic expansion, | |
1985 | and word splitting. Dequote the resultant WORD_LIST before returning. */ | |
1986 | WORD_LIST * | |
1987 | expand_string (string, quoted) | |
1988 | char *string; | |
1989 | int quoted; | |
1990 | { | |
1991 | WORD_LIST *result; | |
1992 | ||
1993 | if (!string || !*string) | |
1994 | return ((WORD_LIST *)NULL); | |
1995 | ||
1996 | result = expand_string_leave_quoted (string, quoted); | |
ccc6cda3 | 1997 | return (result ? dequote_list (result) : result); |
726f6388 JA |
1998 | } |
1999 | ||
2000 | /*************************************************** | |
2001 | * * | |
2002 | * Functions to handle quoting chars * | |
2003 | * * | |
2004 | ***************************************************/ | |
2005 | ||
cce855bc JA |
2006 | /* Conventions: |
2007 | ||
2008 | A string with s[0] == CTLNUL && s[1] == 0 is a quoted null string. | |
2009 | The parser passes CTLNUL as CTLESC CTLNUL. */ | |
2010 | ||
2011 | /* The parser passes us CTLESC as CTLESC CTLESC and CTLNUL as CTLESC CTLNUL. | |
2012 | This is necessary to make unquoted CTLESC and CTLNUL characters in the | |
2013 | data stream pass through properly. | |
2014 | Here we remove doubled CTLESC characters inside quoted strings before | |
2015 | quoting the entire string, so we do not double the number of CTLESC | |
2016 | characters. */ | |
2017 | static char * | |
2018 | remove_quoted_escapes (string) | |
2019 | char *string; | |
2020 | { | |
2021 | register char *s; | |
2022 | int docopy; | |
2023 | char *t, *t1; | |
2024 | ||
2025 | if (string == NULL) | |
2026 | return (string); | |
2027 | ||
2028 | t1 = t = xmalloc (strlen (string) + 1); | |
2029 | for (docopy = 0, s = string; *s; s++, t1++) | |
2030 | { | |
2031 | if (*s == CTLESC && (s[1] == CTLESC || s[1] == CTLNUL)) | |
2032 | { | |
2033 | s++; | |
2034 | docopy = 1; | |
2035 | } | |
2036 | *t1 = *s; | |
2037 | } | |
2038 | *t1 = '\0'; | |
2039 | if (docopy) | |
2040 | strcpy (string, t); | |
2041 | free (t); | |
2042 | return (string); | |
2043 | } | |
2044 | ||
2045 | /* Quote escape characters in string s, but no other characters. This is | |
2046 | used to protect CTLESC and CTLNUL in variable values from the rest of | |
2047 | the word expansion process after the variable is expanded. */ | |
2048 | static char * | |
2049 | quote_escapes (string) | |
2050 | char *string; | |
2051 | { | |
2052 | register char *s, *t; | |
2053 | char *result; | |
2054 | ||
2055 | result = xmalloc ((strlen (string) * 2) + 1); | |
2056 | for (s = string, t = result; *s; ) | |
2057 | { | |
2058 | if (*s == CTLESC || *s == CTLNUL) | |
2059 | *t++ = CTLESC; | |
2060 | *t++ = *s++; | |
2061 | } | |
2062 | *t = '\0'; | |
2063 | return (result); | |
2064 | } | |
2065 | ||
2066 | static WORD_LIST * | |
2067 | list_quote_escapes (list) | |
2068 | WORD_LIST *list; | |
2069 | { | |
2070 | register WORD_LIST *w; | |
2071 | char *t; | |
2072 | ||
2073 | for (w = list; w; w = w->next) | |
2074 | { | |
2075 | t = w->word->word; | |
2076 | w->word->word = quote_escapes (t); | |
2077 | free (t); | |
2078 | } | |
2079 | return list; | |
2080 | } | |
2081 | ||
2082 | #ifdef INCLUDE_UNUSED | |
2083 | static char * | |
2084 | dequote_escapes (string) | |
2085 | char *string; | |
2086 | { | |
2087 | register char *s, *t; | |
2088 | char *result; | |
2089 | ||
2090 | result = xmalloc (strlen (string) + 1); | |
2091 | for (s = string, t = result; *s; ) | |
2092 | { | |
2093 | if (*s == CTLESC && (s[1] == CTLESC || s[1] == CTLNUL)) | |
2094 | { | |
2095 | s++; | |
2096 | if (*s == '\0') | |
2097 | break; | |
2098 | } | |
2099 | *t++ = *s++; | |
2100 | } | |
2101 | *t = '\0'; | |
2102 | return result; | |
2103 | } | |
2104 | #endif | |
2105 | ||
ccc6cda3 | 2106 | static WORD_LIST * |
726f6388 | 2107 | dequote_list (list) |
ccc6cda3 | 2108 | WORD_LIST *list; |
726f6388 JA |
2109 | { |
2110 | register char *s; | |
ccc6cda3 | 2111 | register WORD_LIST *tlist; |
726f6388 | 2112 | |
ccc6cda3 | 2113 | for (tlist = list; tlist; tlist = tlist->next) |
726f6388 | 2114 | { |
ccc6cda3 JA |
2115 | s = dequote_string (tlist->word->word); |
2116 | free (tlist->word->word); | |
2117 | tlist->word->word = s; | |
726f6388 | 2118 | } |
ccc6cda3 | 2119 | return list; |
726f6388 JA |
2120 | } |
2121 | ||
2122 | static char * | |
2123 | make_quoted_char (c) | |
2124 | int c; | |
2125 | { | |
2126 | char *temp; | |
2127 | ||
2128 | temp = xmalloc (3); | |
2129 | if (c == 0) | |
2130 | { | |
2131 | temp[0] = CTLNUL; | |
2132 | temp[1] = '\0'; | |
2133 | } | |
2134 | else | |
2135 | { | |
2136 | temp[0] = CTLESC; | |
2137 | temp[1] = c; | |
2138 | temp[2] = '\0'; | |
2139 | } | |
2140 | return (temp); | |
2141 | } | |
2142 | ||
2143 | /* Quote STRING. Return a new string. */ | |
ccc6cda3 | 2144 | char * |
726f6388 JA |
2145 | quote_string (string) |
2146 | char *string; | |
2147 | { | |
ccc6cda3 | 2148 | register char *t; |
726f6388 JA |
2149 | char *result; |
2150 | ||
ccc6cda3 | 2151 | if (*string == 0) |
726f6388 JA |
2152 | { |
2153 | result = xmalloc (2); | |
2154 | result[0] = CTLNUL; | |
2155 | result[1] = '\0'; | |
2156 | } | |
2157 | else | |
2158 | { | |
726f6388 JA |
2159 | result = xmalloc ((strlen (string) * 2) + 1); |
2160 | ||
ccc6cda3 | 2161 | for (t = result; *string; ) |
726f6388 JA |
2162 | { |
2163 | *t++ = CTLESC; | |
2164 | *t++ = *string++; | |
2165 | } | |
2166 | *t = '\0'; | |
2167 | } | |
2168 | return (result); | |
2169 | } | |
2170 | ||
2171 | /* De-quoted quoted characters in STRING. */ | |
2172 | char * | |
2173 | dequote_string (string) | |
2174 | char *string; | |
2175 | { | |
2176 | register char *t; | |
2177 | char *result; | |
2178 | ||
2179 | result = xmalloc (strlen (string) + 1); | |
2180 | ||
2181 | if (QUOTED_NULL (string)) | |
2182 | { | |
2183 | result[0] = '\0'; | |
2184 | return (result); | |
2185 | } | |
2186 | ||
2187 | /* If no character in the string can be quoted, don't bother examining | |
2188 | each character. Just return a copy of the string passed to us. */ | |
2189 | if (strchr (string, CTLESC) == NULL) /* XXX */ | |
2190 | { /* XXX */ | |
2191 | strcpy (result, string); /* XXX */ | |
2192 | return (result); /* XXX */ | |
2193 | } | |
2194 | ||
ccc6cda3 | 2195 | for (t = result; *string; string++, t++) |
726f6388 JA |
2196 | { |
2197 | if (*string == CTLESC) | |
2198 | { | |
2199 | string++; | |
2200 | ||
2201 | if (!*string) | |
2202 | break; | |
2203 | } | |
2204 | ||
ccc6cda3 | 2205 | *t = *string; |
726f6388 JA |
2206 | } |
2207 | ||
2208 | *t = '\0'; | |
2209 | return (result); | |
2210 | } | |
2211 | ||
2212 | /* Quote the entire WORD_LIST list. */ | |
ccc6cda3 | 2213 | static WORD_LIST * |
726f6388 JA |
2214 | quote_list (list) |
2215 | WORD_LIST *list; | |
2216 | { | |
2217 | register WORD_LIST *w; | |
ccc6cda3 | 2218 | char *t; |
726f6388 JA |
2219 | |
2220 | for (w = list; w; w = w->next) | |
2221 | { | |
ccc6cda3 | 2222 | t = w->word->word; |
726f6388 JA |
2223 | w->word->word = quote_string (t); |
2224 | free (t); | |
ccc6cda3 | 2225 | w->word->flags |= W_QUOTED; |
726f6388 | 2226 | } |
ccc6cda3 | 2227 | return list; |
726f6388 JA |
2228 | } |
2229 | ||
cce855bc JA |
2230 | /* Perform quoted null character removal on STRING. We don't allow any |
2231 | quoted null characters in the middle or at the ends of strings because | |
2232 | of how expand_word_internal works. remove_quoted_nulls () turns | |
2233 | STRING into an empty string iff it only consists of a quoted null, | |
2234 | and removes all unquoted CTLNUL characters. */ | |
2235 | /* | |
2236 | #define remove_quoted_nulls(string) \ | |
2237 | do { if (QUOTED_NULL (string)) string[0] ='\0'; } while (0) | |
2238 | */ | |
2239 | static void | |
2240 | remove_quoted_nulls (string) | |
2241 | char *string; | |
2242 | { | |
2243 | char *nstr, *s, *p; | |
2244 | ||
2245 | nstr = savestring (string); | |
2246 | nstr[0] = '\0'; | |
2247 | for (p = nstr, s = string; *s; s++) | |
2248 | { | |
2249 | if (*s == CTLESC) | |
2250 | { | |
2251 | *p++ = *s++; /* CTLESC */ | |
2252 | if (*s == 0) | |
2253 | break; | |
2254 | *p++ = *s; /* quoted char */ | |
2255 | continue; | |
2256 | } | |
2257 | if (*s == CTLNUL) | |
2258 | continue; | |
2259 | *p++ = *s; | |
2260 | } | |
2261 | *p = '\0'; | |
2262 | strcpy (string, nstr); | |
2263 | free (nstr); | |
2264 | } | |
2265 | ||
2266 | /* Perform quoted null character removal on each element of LIST. | |
2267 | This modifies LIST. */ | |
2268 | void | |
2269 | word_list_remove_quoted_nulls (list) | |
2270 | WORD_LIST *list; | |
2271 | { | |
2272 | register WORD_LIST *t; | |
2273 | ||
2274 | for (t = list; t; t = t->next) | |
2275 | remove_quoted_nulls (t->word->word); | |
2276 | } | |
2277 | ||
2278 | /* **************************************************************** */ | |
2279 | /* */ | |
2280 | /* Functions for Matching and Removing Patterns */ | |
2281 | /* */ | |
2282 | /* **************************************************************** */ | |
2283 | ||
2284 | /* Remove the portion of PARAM matched by PATTERN according to OP, where OP | |
2285 | can have one of 4 values: | |
2286 | RP_LONG_LEFT remove longest matching portion at start of PARAM | |
726f6388 JA |
2287 | RP_SHORT_LEFT remove shortest matching portion at start of PARAM |
2288 | RP_LONG_RIGHT remove longest matching portion at end of PARAM | |
2289 | RP_SHORT_RIGHT remove shortest matching portion at end of PARAM | |
2290 | */ | |
2291 | ||
2292 | #define RP_LONG_LEFT 1 | |
2293 | #define RP_SHORT_LEFT 2 | |
2294 | #define RP_LONG_RIGHT 3 | |
2295 | #define RP_SHORT_RIGHT 4 | |
2296 | ||
2297 | static char * | |
2298 | remove_pattern (param, pattern, op) | |
2299 | char *param, *pattern; | |
2300 | int op; | |
2301 | { | |
ccc6cda3 JA |
2302 | register int len; |
2303 | register char *end; | |
726f6388 JA |
2304 | register char *p, *ret, c; |
2305 | ||
ccc6cda3 JA |
2306 | if (param == NULL || *param == '\0') |
2307 | return (param); | |
726f6388 JA |
2308 | if (pattern == NULL || *pattern == '\0') /* minor optimization */ |
2309 | return (savestring (param)); | |
2310 | ||
ccc6cda3 JA |
2311 | len = STRLEN (param); |
2312 | end = param + len; | |
726f6388 JA |
2313 | |
2314 | switch (op) | |
2315 | { | |
2316 | case RP_LONG_LEFT: /* remove longest match at start */ | |
2317 | for (p = end; p >= param; p--) | |
2318 | { | |
2319 | c = *p; *p = '\0'; | |
cce855bc | 2320 | if (fnmatch (pattern, param, FNMATCH_EXTFLAG) != FNM_NOMATCH) |
726f6388 JA |
2321 | { |
2322 | *p = c; | |
2323 | return (savestring (p)); | |
2324 | } | |
2325 | *p = c; | |
2326 | } | |
2327 | break; | |
2328 | ||
2329 | case RP_SHORT_LEFT: /* remove shortest match at start */ | |
2330 | for (p = param; p <= end; p++) | |
2331 | { | |
2332 | c = *p; *p = '\0'; | |
cce855bc | 2333 | if (fnmatch (pattern, param, FNMATCH_EXTFLAG) != FNM_NOMATCH) |
726f6388 JA |
2334 | { |
2335 | *p = c; | |
2336 | return (savestring (p)); | |
2337 | } | |
2338 | *p = c; | |
2339 | } | |
2340 | break; | |
2341 | ||
ccc6cda3 JA |
2342 | case RP_LONG_RIGHT: /* remove longest match at end */ |
2343 | for (p = param; p <= end; p++) | |
2344 | { | |
cce855bc | 2345 | if (fnmatch (pattern, p, FNMATCH_EXTFLAG) != FNM_NOMATCH) |
ccc6cda3 JA |
2346 | { |
2347 | c = *p; *p = '\0'; | |
2348 | ret = savestring (param); | |
2349 | *p = c; | |
2350 | return (ret); | |
2351 | } | |
2352 | } | |
2353 | break; | |
2354 | ||
2355 | case RP_SHORT_RIGHT: /* remove shortest match at end */ | |
2356 | for (p = end; p >= param; p--) | |
2357 | { | |
cce855bc | 2358 | if (fnmatch (pattern, p, FNMATCH_EXTFLAG) != FNM_NOMATCH) |
ccc6cda3 JA |
2359 | { |
2360 | c = *p; *p = '\0'; | |
2361 | ret = savestring (param); | |
2362 | *p = c; | |
2363 | return (ret); | |
2364 | } | |
2365 | } | |
2366 | break; | |
2367 | } | |
2368 | return (savestring (param)); /* no match, return original string */ | |
2369 | } | |
2370 | ||
2371 | /* Return 1 of the first character of STRING could match the first | |
2372 | character of pattern PAT. Used to avoid n2 calls to fnmatch(). */ | |
2373 | static int | |
2374 | match_pattern_char (pat, string) | |
2375 | char *pat, *string; | |
2376 | { | |
d166f048 | 2377 | char c; |
ccc6cda3 JA |
2378 | |
2379 | if (*string == 0) | |
2380 | return (0); | |
2381 | ||
2382 | switch (c = *pat++) | |
2383 | { | |
2384 | default: | |
2385 | return (*string == c); | |
2386 | case '\\': | |
2387 | return (*string == *pat); | |
2388 | case '?': | |
cce855bc | 2389 | return (*string == LPAREN ? 1 : (*string != '\0')); |
ccc6cda3 JA |
2390 | case '*': |
2391 | return (1); | |
cce855bc JA |
2392 | case '+': |
2393 | case '!': | |
2394 | case '@': | |
2395 | return (*string == LPAREN ? 1 : (*string == c)); | |
ccc6cda3 | 2396 | case '[': |
d166f048 | 2397 | return (*string != '\0'); |
ccc6cda3 JA |
2398 | } |
2399 | } | |
2400 | ||
2401 | /* Match PAT anywhere in STRING and return the match boundaries. | |
2402 | This returns 1 in case of a successful match, 0 otherwise. SP | |
2403 | and EP are pointers into the string where the match begins and | |
2404 | ends, respectively. MTYPE controls what kind of match is attempted. | |
2405 | MATCH_BEG and MATCH_END anchor the match at the beginning and end | |
2406 | of the string, respectively. The longest match is returned. */ | |
2407 | static int | |
2408 | match_pattern (string, pat, mtype, sp, ep) | |
2409 | char *string, *pat; | |
2410 | int mtype; | |
2411 | char **sp, **ep; | |
2412 | { | |
2413 | int c; | |
2414 | register char *p, *p1; | |
2415 | char *end; | |
2416 | ||
2417 | if (string == 0 || *string == 0 || pat == 0 || *pat == 0) | |
2418 | return (0); | |
2419 | ||
2420 | end = string + STRLEN (string); | |
2421 | ||
2422 | switch (mtype) | |
2423 | { | |
2424 | case MATCH_ANY: | |
2425 | for (p = string; p <= end; p++) | |
2426 | { | |
2427 | if (match_pattern_char (pat, p)) | |
2428 | { | |
2429 | for (p1 = end; p1 >= p; p1--) | |
2430 | { | |
2431 | c = *p1; *p1 = '\0'; | |
cce855bc | 2432 | if (fnmatch (pat, p, FNMATCH_EXTFLAG) == 0) |
ccc6cda3 JA |
2433 | { |
2434 | *p1 = c; | |
2435 | *sp = p; | |
2436 | *ep = p1; | |
2437 | return 1; | |
2438 | } | |
2439 | *p1 = c; | |
2440 | } | |
2441 | } | |
2442 | } | |
2443 | return (0); | |
2444 | ||
2445 | case MATCH_BEG: | |
2446 | if (match_pattern_char (pat, string) == 0) | |
2447 | return (0); | |
2448 | for (p = end; p >= string; p--) | |
2449 | { | |
2450 | c = *p; *p = '\0'; | |
cce855bc | 2451 | if (fnmatch (pat, string, FNMATCH_EXTFLAG) == 0) |
ccc6cda3 JA |
2452 | { |
2453 | *p = c; | |
2454 | *sp = string; | |
2455 | *ep = p; | |
2456 | return 1; | |
2457 | } | |
2458 | *p = c; | |
2459 | } | |
2460 | return (0); | |
726f6388 | 2461 | |
ccc6cda3 JA |
2462 | case MATCH_END: |
2463 | for (p = string; p <= end; p++) | |
cce855bc | 2464 | if (fnmatch (pat, p, FNMATCH_EXTFLAG) == 0) |
726f6388 | 2465 | { |
ccc6cda3 JA |
2466 | *sp = p; |
2467 | *ep = end; | |
2468 | return 1; | |
726f6388 | 2469 | } |
ccc6cda3 | 2470 | return (0); |
726f6388 | 2471 | } |
ccc6cda3 JA |
2472 | |
2473 | return (0); | |
726f6388 JA |
2474 | } |
2475 | ||
cce855bc JA |
2476 | static int |
2477 | getpatspec (c, value) | |
2478 | int c; | |
2479 | char *value; | |
2480 | { | |
2481 | if (c == '#') | |
2482 | return ((*value == '#') ? RP_LONG_LEFT : RP_SHORT_LEFT); | |
2483 | else /* c == '%' */ | |
2484 | return ((*value == '%') ? RP_LONG_RIGHT : RP_SHORT_RIGHT); | |
2485 | } | |
2486 | ||
2487 | /* Posix.2 says that the WORD should be run through tilde expansion, | |
2488 | parameter expansion, command substitution and arithmetic expansion. | |
2489 | This leaves the result quoted, so quote_string_for_globbing () has | |
2490 | to be called to fix it up for fnmatch (). If QUOTED is non-zero, | |
2491 | it means that the entire expression was enclosed in double quotes. | |
2492 | This means that quoting characters in the pattern do not make any | |
2493 | special pattern characters quoted. For example, the `*' in the | |
2494 | following retains its special meaning: "${foo#'*'}". */ | |
2495 | static char * | |
2496 | getpattern (value, quoted, expandpat) | |
2497 | char *value; | |
2498 | int quoted, expandpat; | |
2499 | { | |
2500 | char *pat, *tword; | |
2501 | WORD_LIST *l; | |
2502 | int i; | |
2503 | ||
2504 | tword = strchr (value, '~') ? bash_tilde_expand (value) : savestring (value); | |
2505 | ||
2506 | /* expand_string_internal () leaves WORD quoted and does not perform | |
2507 | word splitting. */ | |
2508 | if (expandpat && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && *tword) | |
2509 | { | |
2510 | i = 0; | |
2511 | pat = string_extract_double_quoted (tword, &i, 1); | |
2512 | free (tword); | |
2513 | tword = pat; | |
2514 | } | |
2515 | ||
2516 | /* There is a problem here: how to handle single or double quotes in the | |
2517 | pattern string when the whole expression is between double quotes? */ | |
2518 | #if 0 | |
2519 | l = *tword ? expand_string_for_rhs (tword, quoted, (int *)NULL, (int *)NULL) | |
2520 | #else | |
2521 | l = *tword ? expand_string_for_rhs (tword, | |
2522 | (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? Q_NOQUOTE : quoted, | |
2523 | (int *)NULL, (int *)NULL) | |
2524 | #endif | |
2525 | : (WORD_LIST *)0; | |
2526 | free (tword); | |
2527 | pat = string_list (l); | |
2528 | dispose_words (l); | |
2529 | if (pat) | |
2530 | { | |
2531 | tword = quote_string_for_globbing (pat, QGLOB_CVTNULL); | |
2532 | free (pat); | |
2533 | pat = tword; | |
2534 | } | |
2535 | return (pat); | |
2536 | } | |
2537 | ||
2538 | /* Handle removing a pattern from a string as a result of ${name%[%]value} | |
2539 | or ${name#[#]value}. */ | |
2540 | static char * | |
2541 | parameter_brace_remove_pattern (value, temp, c, quoted) | |
2542 | char *value, *temp; | |
2543 | int c, quoted; | |
2544 | { | |
2545 | int patspec; | |
2546 | char *pattern, *tword; | |
2547 | ||
2548 | patspec = getpatspec (c, value); | |
2549 | if (patspec == RP_LONG_LEFT || patspec == RP_LONG_RIGHT) | |
2550 | value++; | |
2551 | ||
2552 | pattern = getpattern (value, quoted, 1); | |
2553 | ||
2554 | tword = remove_pattern (temp, pattern, patspec); | |
2555 | ||
2556 | FREE (pattern); | |
2557 | return (tword); | |
2558 | } | |
2559 | ||
2560 | static char * | |
2561 | list_remove_pattern (list, pattern, patspec, type, quoted) | |
2562 | WORD_LIST *list; | |
2563 | char *pattern; | |
2564 | int patspec, type, quoted; | |
2565 | { | |
2566 | WORD_LIST *new, *l; | |
2567 | WORD_DESC *w; | |
2568 | char *tword; | |
2569 | ||
2570 | for (new = (WORD_LIST *)NULL, l = list; l; l = l->next) | |
2571 | { | |
2572 | tword = remove_pattern (l->word->word, pattern, patspec); | |
2573 | w = make_bare_word (tword); | |
2574 | free (tword); | |
2575 | new = make_word_list (w, new); | |
2576 | } | |
2577 | ||
2578 | l = REVERSE_LIST (new, WORD_LIST *); | |
2579 | if (type == '*') | |
2580 | tword = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? string_list_dollar_star (l) : string_list (l); | |
2581 | else | |
2582 | tword = string_list ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? quote_list (l) : l); | |
2583 | ||
2584 | dispose_words (l); | |
2585 | return (tword); | |
2586 | } | |
2587 | ||
2588 | static char * | |
2589 | parameter_list_remove_pattern (value, type, c, quoted) | |
2590 | char *value; | |
2591 | int type, c, quoted; | |
2592 | { | |
2593 | int patspec; | |
2594 | char *pattern, *ret; | |
2595 | WORD_LIST *list; | |
2596 | ||
2597 | patspec = getpatspec (c, value); | |
2598 | if (patspec == RP_LONG_LEFT || patspec == RP_LONG_RIGHT) | |
2599 | value++; | |
2600 | ||
2601 | pattern = getpattern (value, quoted, 1); | |
2602 | ||
2603 | list = list_rest_of_args (); | |
2604 | ret = list_remove_pattern (list, pattern, patspec, type, quoted); | |
2605 | dispose_words (list); | |
2606 | FREE (pattern); | |
2607 | return (ret); | |
2608 | } | |
2609 | ||
2610 | #if defined (ARRAY_VARS) | |
2611 | static char * | |
2612 | array_remove_pattern (value, aspec, aval, c, quoted) | |
2613 | char *value, *aspec, *aval; /* AVAL == evaluated ASPEC */ | |
2614 | int c, quoted; | |
2615 | { | |
2616 | SHELL_VAR *var; | |
2617 | int len, patspec; | |
2618 | char *ret, *t, *pattern; | |
2619 | WORD_LIST *l; | |
2620 | ||
2621 | var = array_variable_part (aspec, &t, &len); | |
2622 | if (var == 0) | |
2623 | return ((char *)NULL); | |
2624 | ||
2625 | patspec = getpatspec (c, value); | |
2626 | if (patspec == RP_LONG_LEFT || patspec == RP_LONG_RIGHT) | |
2627 | value++; | |
2628 | ||
2629 | pattern = getpattern (value, quoted, 1); | |
2630 | ||
2631 | if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') | |
2632 | { | |
2633 | if (array_p (var) == 0) | |
2634 | { | |
2635 | report_error ("%s: bad array subscript", aspec); | |
2636 | FREE (pattern); | |
2637 | return ((char *)NULL); | |
2638 | } | |
2639 | l = array_to_word_list (array_cell (var)); | |
2640 | if (l == 0) | |
2641 | return ((char *)NULL); | |
2642 | ret = list_remove_pattern (l, pattern, patspec, t[0], quoted); | |
2643 | dispose_words (l); | |
2644 | } | |
2645 | else | |
2646 | { | |
2647 | ret = remove_pattern (aval, pattern, patspec); | |
2648 | if (ret) | |
2649 | { | |
2650 | t = quote_escapes (ret); | |
2651 | free (ret); | |
2652 | ret = t; | |
2653 | } | |
2654 | } | |
2655 | ||
2656 | FREE (pattern); | |
2657 | return ret; | |
2658 | } | |
2659 | #endif /* ARRAY_VARS */ | |
2660 | ||
726f6388 JA |
2661 | /******************************************* |
2662 | * * | |
2663 | * Functions to expand WORD_DESCs * | |
2664 | * * | |
2665 | *******************************************/ | |
2666 | ||
2667 | /* Expand WORD, performing word splitting on the result. This does | |
2668 | parameter expansion, command substitution, arithmetic expansion, | |
2669 | word splitting, and quote removal. */ | |
2670 | ||
2671 | WORD_LIST * | |
2672 | expand_word (word, quoted) | |
2673 | WORD_DESC *word; | |
2674 | int quoted; | |
2675 | { | |
2676 | WORD_LIST *result, *tresult; | |
2677 | ||
b72432fd | 2678 | tresult = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL); |
726f6388 JA |
2679 | result = word_list_split (tresult); |
2680 | dispose_words (tresult); | |
ccc6cda3 | 2681 | return (result ? dequote_list (result) : result); |
726f6388 JA |
2682 | } |
2683 | ||
2684 | /* Expand WORD, but do not perform word splitting on the result. This | |
2685 | does parameter expansion, command substitution, arithmetic expansion, | |
2686 | and quote removal. */ | |
2687 | WORD_LIST * | |
2688 | expand_word_no_split (word, quoted) | |
2689 | WORD_DESC *word; | |
2690 | int quoted; | |
2691 | { | |
2692 | WORD_LIST *result; | |
2693 | ||
b72432fd | 2694 | result = call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL); |
ccc6cda3 | 2695 | return (result ? dequote_list (result) : result); |
726f6388 JA |
2696 | } |
2697 | ||
2698 | /* Perform shell expansions on WORD, but do not perform word splitting or | |
2699 | quote removal on the result. */ | |
2700 | WORD_LIST * | |
2701 | expand_word_leave_quoted (word, quoted) | |
2702 | WORD_DESC *word; | |
2703 | int quoted; | |
2704 | { | |
b72432fd | 2705 | return (call_expand_word_internal (word, quoted, 0, (int *)NULL, (int *)NULL)); |
726f6388 JA |
2706 | } |
2707 | ||
726f6388 JA |
2708 | #if defined (PROCESS_SUBSTITUTION) |
2709 | ||
cce855bc JA |
2710 | /*****************************************************************/ |
2711 | /* */ | |
2712 | /* Hacking Process Substitution */ | |
2713 | /* */ | |
2714 | /*****************************************************************/ | |
726f6388 | 2715 | |
726f6388 JA |
2716 | #if !defined (HAVE_DEV_FD) |
2717 | /* Named pipes must be removed explicitly with `unlink'. This keeps a list | |
2718 | of FIFOs the shell has open. unlink_fifo_list will walk the list and | |
2719 | unlink all of them. add_fifo_list adds the name of an open FIFO to the | |
2720 | list. NFIFO is a count of the number of FIFOs in the list. */ | |
2721 | #define FIFO_INCR 20 | |
ccc6cda3 | 2722 | extern char *mktemp (); |
726f6388 JA |
2723 | |
2724 | static char **fifo_list = (char **)NULL; | |
ccc6cda3 JA |
2725 | static int nfifo; |
2726 | static int fifo_list_size; | |
726f6388 JA |
2727 | |
2728 | static void | |
2729 | add_fifo_list (pathname) | |
2730 | char *pathname; | |
2731 | { | |
2732 | if (nfifo >= fifo_list_size - 1) | |
2733 | { | |
2734 | fifo_list_size += FIFO_INCR; | |
2735 | fifo_list = (char **)xrealloc (fifo_list, | |
2736 | fifo_list_size * sizeof (char *)); | |
2737 | } | |
2738 | ||
2739 | fifo_list[nfifo++] = savestring (pathname); | |
2740 | } | |
2741 | ||
2742 | void | |
2743 | unlink_fifo_list () | |
2744 | { | |
ccc6cda3 | 2745 | if (nfifo == 0) |
726f6388 JA |
2746 | return; |
2747 | ||
2748 | while (nfifo--) | |
2749 | { | |
2750 | unlink (fifo_list[nfifo]); | |
2751 | free (fifo_list[nfifo]); | |
2752 | fifo_list[nfifo] = (char *)NULL; | |
2753 | } | |
2754 | nfifo = 0; | |
2755 | } | |
2756 | ||
2757 | static char * | |
2758 | make_named_pipe () | |
2759 | { | |
2760 | char *tname; | |
2761 | ||
2762 | tname = mktemp (savestring ("/tmp/sh-np-XXXXXX")); | |
2763 | if (mkfifo (tname, 0600) < 0) | |
2764 | { | |
2765 | free (tname); | |
2766 | return ((char *)NULL); | |
2767 | } | |
2768 | ||
2769 | add_fifo_list (tname); | |
2770 | return (tname); | |
2771 | } | |
2772 | ||
726f6388 JA |
2773 | #else /* HAVE_DEV_FD */ |
2774 | ||
2775 | /* DEV_FD_LIST is a bitmap of file descriptors attached to pipes the shell | |
2776 | has open to children. NFDS is a count of the number of bits currently | |
2777 | set in DEV_FD_LIST. TOTFDS is a count of the highest possible number | |
2778 | of open files. */ | |
2779 | static char *dev_fd_list = (char *)NULL; | |
ccc6cda3 | 2780 | static int nfds; |
726f6388 JA |
2781 | static int totfds; /* The highest possible number of open files. */ |
2782 | ||
2783 | static void | |
2784 | add_fifo_list (fd) | |
2785 | int fd; | |
2786 | { | |
2787 | if (!dev_fd_list || fd >= totfds) | |
2788 | { | |
2789 | int ofds; | |
2790 | ||
2791 | ofds = totfds; | |
2792 | totfds = getdtablesize (); | |
2793 | if (totfds < 0 || totfds > 256) | |
2794 | totfds = 256; | |
2795 | if (fd > totfds) | |
2796 | totfds = fd + 2; | |
2797 | ||
2798 | dev_fd_list = xrealloc (dev_fd_list, totfds); | |
2799 | bzero (dev_fd_list + ofds, totfds - ofds); | |
2800 | } | |
2801 | ||
2802 | dev_fd_list[fd] = 1; | |
2803 | nfds++; | |
2804 | } | |
2805 | ||
2806 | void | |
2807 | unlink_fifo_list () | |
2808 | { | |
2809 | register int i; | |
2810 | ||
ccc6cda3 | 2811 | if (nfds == 0) |
726f6388 JA |
2812 | return; |
2813 | ||
2814 | for (i = 0; nfds && i < totfds; i++) | |
2815 | if (dev_fd_list[i]) | |
2816 | { | |
2817 | close (i); | |
2818 | dev_fd_list[i] = 0; | |
2819 | nfds--; | |
2820 | } | |
2821 | ||
2822 | nfds = 0; | |
2823 | } | |
2824 | ||
2825 | #if defined (NOTDEF) | |
2826 | print_dev_fd_list () | |
2827 | { | |
2828 | register int i; | |
2829 | ||
2830 | fprintf (stderr, "pid %d: dev_fd_list:", getpid ()); | |
2831 | fflush (stderr); | |
2832 | ||
2833 | for (i = 0; i < totfds; i++) | |
2834 | { | |
2835 | if (dev_fd_list[i]) | |
2836 | fprintf (stderr, " %d", i); | |
2837 | } | |
2838 | fprintf (stderr, "\n"); | |
2839 | } | |
2840 | #endif /* NOTDEF */ | |
2841 | ||
2842 | static char * | |
2843 | make_dev_fd_filename (fd) | |
2844 | int fd; | |
2845 | { | |
2846 | char *ret; | |
2847 | ||
d166f048 | 2848 | ret = xmalloc (sizeof (DEV_FD_PREFIX) + 4); |
ccc6cda3 | 2849 | sprintf (ret, "%s%d", DEV_FD_PREFIX, fd); |
726f6388 JA |
2850 | add_fifo_list (fd); |
2851 | return (ret); | |
2852 | } | |
2853 | ||
2854 | #endif /* HAVE_DEV_FD */ | |
2855 | ||
2856 | /* Return a filename that will open a connection to the process defined by | |
2857 | executing STRING. HAVE_DEV_FD, if defined, means open a pipe and return | |
2858 | a filename in /dev/fd corresponding to a descriptor that is one of the | |
2859 | ends of the pipe. If not defined, we use named pipes on systems that have | |
2860 | them. Systems without /dev/fd and named pipes are out of luck. | |
2861 | ||
2862 | OPEN_FOR_READ_IN_CHILD, if 1, means open the named pipe for reading or | |
2863 | use the read end of the pipe and dup that file descriptor to fd 0 in | |
2864 | the child. If OPEN_FOR_READ_IN_CHILD is 0, we open the named pipe for | |
2865 | writing or use the write end of the pipe in the child, and dup that | |
2866 | file descriptor to fd 1 in the child. The parent does the opposite. */ | |
2867 | ||
2868 | static char * | |
2869 | process_substitute (string, open_for_read_in_child) | |
2870 | char *string; | |
2871 | int open_for_read_in_child; | |
2872 | { | |
2873 | char *pathname; | |
2874 | int fd, result; | |
2875 | pid_t old_pid, pid; | |
2876 | #if defined (HAVE_DEV_FD) | |
2877 | int parent_pipe_fd, child_pipe_fd; | |
2878 | int fildes[2]; | |
2879 | #endif /* HAVE_DEV_FD */ | |
2880 | #if defined (JOB_CONTROL) | |
2881 | pid_t old_pipeline_pgrp; | |
ccc6cda3 | 2882 | #endif |
726f6388 | 2883 | |
cce855bc | 2884 | if (!string || !*string || wordexp_only) |
726f6388 JA |
2885 | return ((char *)NULL); |
2886 | ||
2887 | #if !defined (HAVE_DEV_FD) | |
2888 | pathname = make_named_pipe (); | |
2889 | #else /* HAVE_DEV_FD */ | |
2890 | if (pipe (fildes) < 0) | |
2891 | { | |
ccc6cda3 | 2892 | sys_error ("cannot make pipe for process substitution"); |
726f6388 JA |
2893 | return ((char *)NULL); |
2894 | } | |
2895 | /* If OPEN_FOR_READ_IN_CHILD == 1, we want to use the write end of | |
2896 | the pipe in the parent, otherwise the read end. */ | |
2897 | parent_pipe_fd = fildes[open_for_read_in_child]; | |
2898 | child_pipe_fd = fildes[1 - open_for_read_in_child]; | |
d166f048 JA |
2899 | /* Move the parent end of the pipe to some high file descriptor, to |
2900 | avoid clashes with FDs used by the script. */ | |
2901 | parent_pipe_fd = move_to_high_fd (parent_pipe_fd, 1, 64); | |
2902 | ||
726f6388 JA |
2903 | pathname = make_dev_fd_filename (parent_pipe_fd); |
2904 | #endif /* HAVE_DEV_FD */ | |
2905 | ||
2906 | if (!pathname) | |
2907 | { | |
ccc6cda3 | 2908 | sys_error ("cannot make pipe for process substitution"); |
726f6388 JA |
2909 | return ((char *)NULL); |
2910 | } | |
2911 | ||
2912 | old_pid = last_made_pid; | |
2913 | ||
2914 | #if defined (JOB_CONTROL) | |
2915 | old_pipeline_pgrp = pipeline_pgrp; | |
2916 | pipeline_pgrp = shell_pgrp; | |
ccc6cda3 | 2917 | #if 0 |
726f6388 | 2918 | cleanup_the_pipeline (); |
ccc6cda3 JA |
2919 | #else |
2920 | save_pipeline (1); | |
2921 | #endif | |
2922 | #endif /* JOB_CONTROL */ | |
2923 | ||
726f6388 JA |
2924 | pid = make_child ((char *)NULL, 1); |
2925 | if (pid == 0) | |
2926 | { | |
ccc6cda3 | 2927 | reset_terminating_signals (); /* XXX */ |
726f6388 JA |
2928 | /* Cancel traps, in trap.c. */ |
2929 | restore_original_signals (); | |
2930 | setup_async_signals (); | |
ccc6cda3 | 2931 | subshell_environment = SUBSHELL_COMSUB; |
726f6388 | 2932 | } |
ccc6cda3 JA |
2933 | |
2934 | #if defined (JOB_CONTROL) | |
726f6388 JA |
2935 | set_sigchld_handler (); |
2936 | stop_making_children (); | |
2937 | pipeline_pgrp = old_pipeline_pgrp; | |
ccc6cda3 | 2938 | #endif /* JOB_CONTROL */ |
726f6388 JA |
2939 | |
2940 | if (pid < 0) | |
2941 | { | |
ccc6cda3 | 2942 | sys_error ("cannot make child for process substitution"); |
726f6388 JA |
2943 | free (pathname); |
2944 | #if defined (HAVE_DEV_FD) | |
2945 | close (parent_pipe_fd); | |
2946 | close (child_pipe_fd); | |
2947 | #endif /* HAVE_DEV_FD */ | |
2948 | return ((char *)NULL); | |
2949 | } | |
2950 | ||
2951 | if (pid > 0) | |
2952 | { | |
ccc6cda3 JA |
2953 | #if defined (JOB_CONTROL) |
2954 | restore_pipeline (1); | |
2955 | #endif | |
2956 | ||
726f6388 JA |
2957 | last_made_pid = old_pid; |
2958 | ||
2959 | #if defined (JOB_CONTROL) && defined (PGRP_PIPE) | |
2960 | close_pgrp_pipe (); | |
2961 | #endif /* JOB_CONTROL && PGRP_PIPE */ | |
2962 | ||
2963 | #if defined (HAVE_DEV_FD) | |
2964 | close (child_pipe_fd); | |
2965 | #endif /* HAVE_DEV_FD */ | |
2966 | ||
2967 | return (pathname); | |
2968 | } | |
2969 | ||
2970 | set_sigint_handler (); | |
2971 | ||
2972 | #if defined (JOB_CONTROL) | |
2973 | set_job_control (0); | |
2974 | #endif /* JOB_CONTROL */ | |
2975 | ||
2976 | #if !defined (HAVE_DEV_FD) | |
2977 | /* Open the named pipe in the child. */ | |
ccc6cda3 | 2978 | fd = open (pathname, open_for_read_in_child ? O_RDONLY|O_NONBLOCK : O_WRONLY); |
726f6388 JA |
2979 | if (fd < 0) |
2980 | { | |
ccc6cda3 JA |
2981 | sys_error ("cannot open named pipe %s for %s", pathname, |
2982 | open_for_read_in_child ? "reading" : "writing"); | |
726f6388 JA |
2983 | exit (127); |
2984 | } | |
2985 | #else /* HAVE_DEV_FD */ | |
2986 | fd = child_pipe_fd; | |
2987 | #endif /* HAVE_DEV_FD */ | |
2988 | ||
2989 | if (dup2 (fd, open_for_read_in_child ? 0 : 1) < 0) | |
2990 | { | |
ccc6cda3 JA |
2991 | sys_error ("cannot duplicate named pipe %s as fd %d", pathname, |
2992 | open_for_read_in_child ? 0 : 1); | |
726f6388 JA |
2993 | exit (127); |
2994 | } | |
2995 | ||
2996 | close (fd); | |
2997 | ||
2998 | /* Need to close any files that this process has open to pipes inherited | |
2999 | from its parent. */ | |
3000 | if (current_fds_to_close) | |
3001 | { | |
3002 | close_fd_bitmap (current_fds_to_close); | |
3003 | current_fds_to_close = (struct fd_bitmap *)NULL; | |
3004 | } | |
3005 | ||
3006 | #if defined (HAVE_DEV_FD) | |
3007 | /* Make sure we close the parent's end of the pipe and clear the slot | |
3008 | in the fd list so it is not closed later, if reallocated by, for | |
3009 | instance, pipe(2). */ | |
3010 | close (parent_pipe_fd); | |
3011 | dev_fd_list[parent_pipe_fd] = 0; | |
3012 | #endif /* HAVE_DEV_FD */ | |
3013 | ||
d166f048 | 3014 | result = parse_and_execute (string, "process substitution", (SEVAL_NONINT|SEVAL_NOHIST)); |
726f6388 JA |
3015 | |
3016 | #if !defined (HAVE_DEV_FD) | |
3017 | /* Make sure we close the named pipe in the child before we exit. */ | |
3018 | close (open_for_read_in_child ? 0 : 1); | |
3019 | #endif /* !HAVE_DEV_FD */ | |
3020 | ||
3021 | exit (result); | |
3022 | /*NOTREACHED*/ | |
3023 | } | |
3024 | #endif /* PROCESS_SUBSTITUTION */ | |
3025 | ||
cce855bc JA |
3026 | /***********************************/ |
3027 | /* */ | |
3028 | /* Command Substitution */ | |
3029 | /* */ | |
3030 | /***********************************/ | |
3031 | ||
d166f048 JA |
3032 | static char * |
3033 | read_comsub (fd, quoted) | |
3034 | int fd, quoted; | |
3035 | { | |
3036 | char *istring, buf[128], *bufp; | |
3037 | int bufn, istring_index, istring_size, c; | |
3038 | ||
3039 | istring = (char *)NULL; | |
3040 | istring_index = istring_size = bufn = 0; | |
3041 | ||
3042 | /* Read the output of the command through the pipe. */ | |
3043 | while (1) | |
3044 | { | |
3045 | if (fd < 0) | |
3046 | break; | |
3047 | if (--bufn <= 0) | |
3048 | { | |
3049 | while ((bufn = read (fd, buf, sizeof(buf))) < 0 && errno == EINTR) | |
3050 | ; | |
3051 | if (bufn <= 0) | |
3052 | break; | |
3053 | bufp = buf; | |
3054 | } | |
3055 | c = *bufp++; | |
3056 | ||
3057 | /* Add the character to ISTRING, possibly after resizing it. */ | |
3058 | RESIZE_MALLOCED_BUFFER (istring, istring_index, 2, istring_size, DEFAULT_ARRAY_SIZE); | |
3059 | ||
3060 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || c == CTLESC || c == CTLNUL) | |
3061 | istring[istring_index++] = CTLESC; | |
3062 | ||
3063 | istring[istring_index++] = c; | |
3064 | } | |
3065 | ||
3066 | if (istring) | |
3067 | istring[istring_index] = '\0'; | |
3068 | ||
3069 | /* If we read no output, just return now and save ourselves some | |
3070 | trouble. */ | |
3071 | if (istring_index == 0) | |
3072 | { | |
3073 | FREE (istring); | |
3074 | return (char *)NULL; | |
3075 | } | |
3076 | ||
3077 | /* Strip trailing newlines from the output of the command. */ | |
3078 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
3079 | { | |
3080 | while (istring_index > 0) | |
3081 | { | |
3082 | if (istring[istring_index - 1] == '\n') | |
3083 | { | |
3084 | --istring_index; | |
3085 | ||
3086 | /* If the newline was quoted, remove the quoting char. */ | |
3087 | if (istring[istring_index - 1] == CTLESC) | |
3088 | --istring_index; | |
3089 | } | |
3090 | else | |
3091 | break; | |
3092 | } | |
3093 | istring[istring_index] = '\0'; | |
3094 | } | |
3095 | else | |
3096 | strip_trailing (istring, istring_index - 1, 1); | |
3097 | ||
3098 | return istring; | |
3099 | } | |
3100 | ||
726f6388 JA |
3101 | /* Perform command substitution on STRING. This returns a string, |
3102 | possibly quoted. */ | |
3103 | static char * | |
3104 | command_substitute (string, quoted) | |
3105 | char *string; | |
3106 | int quoted; | |
3107 | { | |
ccc6cda3 JA |
3108 | pid_t pid, old_pid, old_pipeline_pgrp; |
3109 | char *istring; | |
d166f048 | 3110 | int result, fildes[2]; |
726f6388 | 3111 | |
ccc6cda3 | 3112 | istring = (char *)NULL; |
726f6388 JA |
3113 | |
3114 | /* Don't fork () if there is no need to. In the case of no command to | |
3115 | run, just return NULL. */ | |
3116 | if (!string || !*string || (string[0] == '\n' && !string[1])) | |
3117 | return ((char *)NULL); | |
3118 | ||
cce855bc JA |
3119 | if (wordexp_only && read_but_dont_execute) |
3120 | { | |
3121 | last_command_exit_value = 125; | |
3122 | jump_to_top_level (EXITPROG); | |
3123 | } | |
3124 | ||
726f6388 JA |
3125 | /* Pipe the output of executing STRING into the current shell. */ |
3126 | if (pipe (fildes) < 0) | |
3127 | { | |
ccc6cda3 | 3128 | sys_error ("cannot make pipes for command substitution"); |
726f6388 JA |
3129 | goto error_exit; |
3130 | } | |
3131 | ||
3132 | old_pid = last_made_pid; | |
3133 | #if defined (JOB_CONTROL) | |
ccc6cda3 JA |
3134 | old_pipeline_pgrp = pipeline_pgrp; |
3135 | pipeline_pgrp = shell_pgrp; | |
3136 | cleanup_the_pipeline (); | |
3137 | #endif | |
726f6388 | 3138 | |
ccc6cda3 | 3139 | pid = make_child ((char *)NULL, 0); |
726f6388 JA |
3140 | if (pid == 0) |
3141 | /* Reset the signal handlers in the child, but don't free the | |
3142 | trap strings. */ | |
3143 | reset_signal_handlers (); | |
ccc6cda3 JA |
3144 | |
3145 | #if defined (JOB_CONTROL) | |
3146 | set_sigchld_handler (); | |
3147 | stop_making_children (); | |
3148 | pipeline_pgrp = old_pipeline_pgrp; | |
3149 | #endif /* JOB_CONTROL */ | |
726f6388 JA |
3150 | |
3151 | if (pid < 0) | |
3152 | { | |
ccc6cda3 | 3153 | sys_error ("cannot make child for command substitution"); |
726f6388 JA |
3154 | error_exit: |
3155 | ||
3156 | FREE (istring); | |
3157 | close (fildes[0]); | |
3158 | close (fildes[1]); | |
3159 | return ((char *)NULL); | |
3160 | } | |
3161 | ||
3162 | if (pid == 0) | |
3163 | { | |
3164 | set_sigint_handler (); /* XXX */ | |
3165 | #if defined (JOB_CONTROL) | |
3166 | set_job_control (0); | |
3167 | #endif | |
3168 | if (dup2 (fildes[1], 1) < 0) | |
3169 | { | |
ccc6cda3 | 3170 | sys_error ("command_substitute: cannot duplicate pipe as fd 1"); |
726f6388 JA |
3171 | exit (EXECUTION_FAILURE); |
3172 | } | |
3173 | ||
3174 | /* If standard output is closed in the parent shell | |
3175 | (such as after `exec >&-'), file descriptor 1 will be | |
3176 | the lowest available file descriptor, and end up in | |
3177 | fildes[0]. This can happen for stdin and stderr as well, | |
3178 | but stdout is more important -- it will cause no output | |
3179 | to be generated from this command. */ | |
3180 | if ((fildes[1] != fileno (stdin)) && | |
3181 | (fildes[1] != fileno (stdout)) && | |
3182 | (fildes[1] != fileno (stderr))) | |
3183 | close (fildes[1]); | |
3184 | ||
3185 | if ((fildes[0] != fileno (stdin)) && | |
3186 | (fildes[0] != fileno (stdout)) && | |
3187 | (fildes[0] != fileno (stderr))) | |
3188 | close (fildes[0]); | |
3189 | ||
3190 | /* The currently executing shell is not interactive. */ | |
3191 | interactive = 0; | |
3192 | ||
ccc6cda3 JA |
3193 | /* This is a subshell environment. */ |
3194 | subshell_environment = SUBSHELL_COMSUB; | |
3195 | ||
726f6388 JA |
3196 | /* Command substitution does not inherit the -e flag. */ |
3197 | exit_immediately_on_error = 0; | |
3198 | ||
3199 | remove_quoted_escapes (string); | |
3200 | ||
ccc6cda3 | 3201 | startup_state = 2; /* see if we can avoid a fork */ |
726f6388 JA |
3202 | /* Give command substitution a place to jump back to on failure, |
3203 | so we don't go back up to main (). */ | |
3204 | result = setjmp (top_level); | |
3205 | ||
3206 | if (result == EXITPROG) | |
3207 | exit (last_command_exit_value); | |
3208 | else if (result) | |
3209 | exit (EXECUTION_FAILURE); | |
3210 | else | |
d166f048 | 3211 | exit (parse_and_execute (string, "command substitution", SEVAL_NOHIST)); |
726f6388 JA |
3212 | } |
3213 | else | |
3214 | { | |
726f6388 JA |
3215 | #if defined (JOB_CONTROL) && defined (PGRP_PIPE) |
3216 | close_pgrp_pipe (); | |
3217 | #endif /* JOB_CONTROL && PGRP_PIPE */ | |
3218 | ||
3219 | close (fildes[1]); | |
3220 | ||
d166f048 | 3221 | istring = read_comsub (fildes[0], quoted); |
ccc6cda3 | 3222 | |
726f6388 JA |
3223 | close (fildes[0]); |
3224 | ||
b72432fd | 3225 | current_command_subst_pid = pid; |
726f6388 JA |
3226 | last_command_exit_value = wait_for (pid); |
3227 | last_command_subst_pid = pid; | |
3228 | last_made_pid = old_pid; | |
3229 | ||
3230 | #if defined (JOB_CONTROL) | |
3231 | /* If last_command_exit_value > 128, then the substituted command | |
3232 | was terminated by a signal. If that signal was SIGINT, then send | |
3233 | SIGINT to ourselves. This will break out of loops, for instance. */ | |
3234 | if (last_command_exit_value == (128 + SIGINT)) | |
3235 | kill (getpid (), SIGINT); | |
3236 | ||
3237 | /* wait_for gives the terminal back to shell_pgrp. If some other | |
cce855bc JA |
3238 | process group should have it, give it away to that group here. |
3239 | pipeline_pgrp is non-zero only while we are constructing a | |
3240 | pipline, so what we are concerned about is whether or not that | |
3241 | pipeline was started in the background. A pipeline started in | |
3242 | the background should never get the tty back here. */ | |
3243 | #if 0 | |
3244 | if (interactive && pipeline_pgrp != (pid_t)0 && pipeline_pgrp != last_asynchronous_pid) | |
3245 | #else | |
3246 | if (interactive && pipeline_pgrp != (pid_t)0 && subshell_environment != SUBSHELL_ASYNC) | |
3247 | #endif | |
726f6388 JA |
3248 | give_terminal_to (pipeline_pgrp); |
3249 | #endif /* JOB_CONTROL */ | |
3250 | ||
726f6388 JA |
3251 | return (istring); |
3252 | } | |
3253 | } | |
3254 | ||
3255 | /******************************************************** | |
3256 | * * | |
3257 | * Utility functions for parameter expansion * | |
3258 | * * | |
3259 | ********************************************************/ | |
3260 | ||
cce855bc | 3261 | /* Utility functions to manage arrays and their contents for expansion */ |
ccc6cda3 JA |
3262 | |
3263 | #if defined (ARRAY_VARS) | |
ccc6cda3 JA |
3264 | int |
3265 | valid_array_reference (name) | |
3266 | char *name; | |
3267 | { | |
3268 | char *t; | |
3269 | int r, len; | |
3270 | ||
3271 | t = strchr (name, '['); | |
3272 | if (t) | |
3273 | { | |
3274 | *t = '\0'; | |
3275 | r = legal_identifier (name); | |
3276 | *t = '['; | |
3277 | if (r == 0) | |
3278 | return 0; | |
3279 | /* Check for a properly-terminated non-blank subscript. */ | |
3280 | len = skipsubscript (t, 0); | |
3281 | if (t[len] != ']' || len == 1) | |
3282 | return 0; | |
3283 | for (r = 1; r < len; r++) | |
3284 | if (whitespace (t[r]) == 0) | |
3285 | return 1; | |
3286 | return 0; | |
3287 | } | |
3288 | return 0; | |
3289 | } | |
3290 | ||
3291 | /* Expand the array index beginning at S and extending LEN characters. */ | |
3292 | int | |
3293 | array_expand_index (s, len) | |
3294 | char *s; | |
3295 | int len; | |
3296 | { | |
3297 | char *exp, *t; | |
d166f048 | 3298 | int val, expok; |
ccc6cda3 JA |
3299 | |
3300 | exp = xmalloc (len); | |
3301 | strncpy (exp, s, len - 1); | |
3302 | exp[len - 1] = '\0'; | |
3303 | t = maybe_expand_string (exp, 0, expand_string); | |
3304 | this_command_name = (char *)NULL; | |
d166f048 | 3305 | val = evalexp (t, &expok); |
ccc6cda3 JA |
3306 | free (t); |
3307 | free (exp); | |
d166f048 JA |
3308 | if (expok == 0) |
3309 | jump_to_top_level (DISCARD); | |
ccc6cda3 JA |
3310 | return val; |
3311 | } | |
3312 | ||
3313 | /* Return the variable specified by S without any subscript. If non-null, | |
3314 | return the index of the start of the subscript in *SUBP. If non-null, | |
3315 | the length of the subscript is returned in *LENP. */ | |
3316 | SHELL_VAR * | |
3317 | array_variable_part (s, subp, lenp) | |
3318 | char *s, **subp; | |
3319 | int *lenp; | |
3320 | { | |
3321 | char *t; | |
3322 | int ind, ni; | |
3323 | SHELL_VAR *var; | |
3324 | ||
3325 | t = strchr (s, '['); | |
3326 | ind = t - s; | |
3327 | ni = skipsubscript (s, ind); | |
3328 | if (ni <= ind + 1 || s[ni] != ']') | |
726f6388 | 3329 | { |
ccc6cda3 JA |
3330 | report_error ("%s: bad array subscript", s); |
3331 | return ((SHELL_VAR *)NULL); | |
3332 | } | |
3333 | ||
3334 | *t = '\0'; | |
3335 | var = find_variable (s); | |
3336 | *t++ = '['; | |
3337 | ||
3338 | if (subp) | |
3339 | *subp = t; | |
3340 | if (lenp) | |
3341 | *lenp = ni - ind; | |
3342 | return var; | |
3343 | } | |
3344 | ||
3345 | static char * | |
3346 | array_value_internal (s, quoted, allow_all) | |
3347 | char *s; | |
3348 | int quoted, allow_all; | |
3349 | { | |
3350 | int len, ind; | |
cce855bc JA |
3351 | char *retval, *t, *temp; |
3352 | WORD_LIST *l, *list; | |
ccc6cda3 JA |
3353 | SHELL_VAR *var; |
3354 | ||
3355 | var = array_variable_part (s, &t, &len); | |
3356 | ||
3357 | if (var == 0) | |
3358 | return (char *)NULL; | |
3359 | ||
3360 | if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') | |
3361 | { | |
3362 | if (array_p (var) == 0 || allow_all == 0) | |
3363 | { | |
3364 | report_error ("%s: bad array subscript", s); | |
3365 | return ((char *)NULL); | |
3366 | } | |
3367 | l = array_to_word_list (array_cell (var)); | |
3368 | if (l == (WORD_LIST *)NULL) | |
3369 | return ((char *) NULL); | |
3370 | ||
cce855bc | 3371 | #if 0 |
ccc6cda3 JA |
3372 | if (t[0] == '*') /* ${name[*]} */ |
3373 | retval = (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? string_list_dollar_star (l) : string_list (l); | |
3374 | else /* ${name[@]} */ | |
3375 | retval = string_list ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) ? quote_list (l) : l); | |
cce855bc JA |
3376 | #else |
3377 | if (t[0] == '*' && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) | |
3378 | { | |
3379 | temp = string_list_dollar_star (l); | |
3380 | retval = quote_string (temp); | |
3381 | free (temp); | |
3382 | } | |
3383 | else /* ${name[@]} or unquoted ${name[*]} */ | |
3384 | retval = string_list_dollar_at (l, quoted); | |
3385 | #endif | |
ccc6cda3 JA |
3386 | |
3387 | dispose_words (l); | |
3388 | } | |
3389 | else | |
3390 | { | |
3391 | ind = array_expand_index (t, len); | |
3392 | if (ind < 0) | |
726f6388 | 3393 | { |
ccc6cda3 JA |
3394 | report_error ("%s: bad array subscript", var->name); |
3395 | return ((char *)NULL); | |
726f6388 | 3396 | } |
ccc6cda3 | 3397 | if (array_p (var) == 0) |
d166f048 | 3398 | return (ind == 0 ? savestring (value_cell (var)) : (char *)NULL); |
ccc6cda3 JA |
3399 | retval = array_reference (array_cell (var), ind); |
3400 | if (retval) | |
3401 | retval = quote_escapes (retval); | |
726f6388 JA |
3402 | } |
3403 | ||
ccc6cda3 JA |
3404 | return retval; |
3405 | } | |
726f6388 | 3406 | |
ccc6cda3 JA |
3407 | static char * |
3408 | array_value (s, quoted) | |
3409 | char *s; | |
3410 | int quoted; | |
3411 | { | |
3412 | return (array_value_internal (s, quoted, 1)); | |
3413 | } | |
3414 | ||
3415 | /* Return the value of the array indexing expression S as a single string. | |
3416 | If ALLOW_ALL is 0, do not allow `@' and `*' subscripts. This is used | |
3417 | by other parts of the shell such as the arithmetic expression evaluator | |
3418 | in expr.c. */ | |
3419 | char * | |
3420 | get_array_value (s, allow_all) | |
3421 | char *s; | |
3422 | int allow_all; | |
3423 | { | |
3424 | return (array_value_internal (s, 0, allow_all)); | |
3425 | } | |
3426 | ||
3427 | static int | |
3428 | array_length_reference (s) | |
3429 | char *s; | |
3430 | { | |
3431 | int ind, len; | |
3432 | char *t; | |
3433 | ARRAY *array; | |
3434 | SHELL_VAR *var; | |
3435 | ||
3436 | var = array_variable_part (s, &t, &len); | |
726f6388 | 3437 | |
ccc6cda3 JA |
3438 | /* If unbound variables should generate an error, report one and return |
3439 | failure. */ | |
3440 | if ((var == 0 || array_p (var) == 0) && unbound_vars_is_error) | |
726f6388 | 3441 | { |
ccc6cda3 JA |
3442 | ind = *--t; |
3443 | *t = '\0'; | |
3444 | report_error ("%s: unbound variable", s); | |
3445 | *t++ = (char)ind; | |
3446 | return (-1); | |
726f6388 | 3447 | } |
ccc6cda3 JA |
3448 | else if (var == 0) |
3449 | return 0; | |
3450 | else if (array_p (var) == 0) | |
3451 | return 1; | |
726f6388 | 3452 | |
ccc6cda3 | 3453 | array = array_cell (var); |
726f6388 | 3454 | |
ccc6cda3 JA |
3455 | if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') |
3456 | return (array_num_elements (array)); | |
3457 | ||
3458 | ind = array_expand_index (t, len); | |
3459 | if (ind < 0) | |
3460 | { | |
3461 | report_error ("%s: bad array subscript", t); | |
3462 | return (-1); | |
3463 | } | |
3464 | t = array_reference (array, ind); | |
3465 | len = STRLEN (t); | |
3466 | ||
3467 | return (len); | |
726f6388 | 3468 | } |
ccc6cda3 | 3469 | #endif /* ARRAY_VARS */ |
726f6388 JA |
3470 | |
3471 | static int | |
3472 | valid_brace_expansion_word (name, var_is_special) | |
3473 | char *name; | |
3474 | int var_is_special; | |
3475 | { | |
3476 | if (digit (*name) && all_digits (name)) | |
3477 | return 1; | |
3478 | else if (var_is_special) | |
3479 | return 1; | |
ccc6cda3 JA |
3480 | #if defined (ARRAY_VARS) |
3481 | else if (valid_array_reference (name)) | |
3482 | return 1; | |
3483 | #endif /* ARRAY_VARS */ | |
726f6388 JA |
3484 | else if (legal_identifier (name)) |
3485 | return 1; | |
3486 | else | |
3487 | return 0; | |
3488 | } | |
ccc6cda3 | 3489 | |
726f6388 JA |
3490 | /* Parameter expand NAME, and return a new string which is the expansion, |
3491 | or NULL if there was no expansion. | |
3492 | VAR_IS_SPECIAL is non-zero if NAME is one of the special variables in | |
3493 | the shell, e.g., "@", "$", "*", etc. QUOTED, if non-zero, means that | |
3494 | NAME was found inside of a double-quoted expression. */ | |
3495 | static char * | |
3496 | parameter_brace_expand_word (name, var_is_special, quoted) | |
3497 | char *name; | |
3498 | int var_is_special, quoted; | |
3499 | { | |
ccc6cda3 JA |
3500 | char *temp, *tt; |
3501 | int arg_index; | |
3502 | SHELL_VAR *var; | |
3503 | WORD_LIST *l; | |
726f6388 JA |
3504 | |
3505 | /* Handle multiple digit arguments, as in ${11}. */ | |
3506 | if (digit (*name)) | |
3507 | { | |
ccc6cda3 | 3508 | arg_index = atoi (name); |
726f6388 JA |
3509 | temp = get_dollar_var_value (arg_index); |
3510 | } | |
3511 | else if (var_is_special) /* ${@} */ | |
3512 | { | |
cce855bc | 3513 | int sindex; |
726f6388 | 3514 | tt = xmalloc (2 + strlen (name)); |
cce855bc | 3515 | tt[sindex = 0] = '$'; |
726f6388 | 3516 | strcpy (tt + 1, name); |
cce855bc | 3517 | #if 0 |
726f6388 JA |
3518 | l = expand_string_leave_quoted (tt, quoted); |
3519 | free (tt); | |
3520 | temp = string_list (l); | |
3521 | dispose_words (l); | |
cce855bc JA |
3522 | #else |
3523 | temp = param_expand (tt, &sindex, quoted, (int *)NULL, (int *)NULL, | |
3524 | (int *)NULL, (int *)NULL, 0); | |
3525 | free (tt); | |
3526 | #endif | |
726f6388 | 3527 | } |
ccc6cda3 JA |
3528 | #if defined (ARRAY_VARS) |
3529 | else if (valid_array_reference (name)) | |
3530 | { | |
3531 | temp = array_value (name, quoted); | |
3532 | } | |
3533 | #endif | |
3534 | else if (var = find_variable (name)) | |
3535 | { | |
3536 | if (var && invisible_p (var) == 0) | |
3537 | { | |
3538 | #if defined (ARRAY_VARS) | |
3539 | temp = array_p (var) ? array_reference (array_cell (var), 0) : value_cell (var); | |
3540 | #else | |
3541 | temp = value_cell (var); | |
3542 | #endif | |
3543 | ||
3544 | if (temp) | |
3545 | temp = quote_escapes (temp); | |
cce855bc JA |
3546 | |
3547 | if (tempvar_p (var)) | |
3548 | dispose_variable (var); | |
ccc6cda3 JA |
3549 | } |
3550 | else | |
3551 | temp = (char *)NULL; | |
3552 | } | |
726f6388 | 3553 | else |
ccc6cda3 | 3554 | temp = (char *)NULL; |
726f6388 | 3555 | |
726f6388 JA |
3556 | return (temp); |
3557 | } | |
3558 | ||
ccc6cda3 JA |
3559 | /* Expand an indirect reference to a variable: ${!NAME} expands to the |
3560 | value of the variable whose name is the value of NAME. */ | |
3561 | static char * | |
3562 | parameter_brace_expand_indir (name, var_is_special, quoted) | |
3563 | char *name; | |
3564 | int var_is_special, quoted; | |
3565 | { | |
3566 | char *temp, *t; | |
3567 | ||
3568 | t = parameter_brace_expand_word (name, var_is_special, quoted); | |
3569 | if (t == 0) | |
3570 | return (t); | |
3571 | temp = parameter_brace_expand_word (t, t[0] == '@' && t[1] == '\0', quoted); | |
3572 | free (t); | |
3573 | return temp; | |
3574 | } | |
3575 | ||
726f6388 JA |
3576 | /* Expand the right side of a parameter expansion of the form ${NAMEcVALUE}, |
3577 | depending on the value of C, the separating character. C can be one of | |
ccc6cda3 JA |
3578 | "-", "+", or "=". QUOTED is true if the entire brace expression occurs |
3579 | between double quotes. */ | |
726f6388 | 3580 | static char * |
ccc6cda3 | 3581 | parameter_brace_expand_rhs (name, value, c, quoted, qdollaratp, hasdollarat) |
726f6388 | 3582 | char *name, *value; |
ccc6cda3 | 3583 | int c, quoted, *qdollaratp, *hasdollarat; |
726f6388 JA |
3584 | { |
3585 | WORD_LIST *l; | |
3586 | char *t, *t1, *temp; | |
ccc6cda3 | 3587 | int hasdol; |
726f6388 | 3588 | |
ccc6cda3 JA |
3589 | temp = (*value == '~' || (strchr (value, '~') && unquoted_substring ("=~", value))) |
3590 | ? bash_tilde_expand (value) | |
3591 | : savestring (value); | |
726f6388 | 3592 | |
ccc6cda3 JA |
3593 | /* If the entire expression is between double quotes, we want to treat |
3594 | the value as a double-quoted string, with the exception that we strip | |
3595 | embedded unescaped double quotes. */ | |
3596 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && *temp) | |
726f6388 | 3597 | { |
ccc6cda3 JA |
3598 | hasdol = 0; |
3599 | t = string_extract_double_quoted (temp, &hasdol, 1); | |
726f6388 JA |
3600 | free (temp); |
3601 | temp = t; | |
726f6388 | 3602 | } |
ccc6cda3 | 3603 | |
726f6388 | 3604 | hasdol = 0; |
ccc6cda3 JA |
3605 | /* XXX was 0 not quoted */ |
3606 | l = *temp ? expand_string_for_rhs (temp, quoted, &hasdol, (int *)NULL) | |
3607 | : (WORD_LIST *)0; | |
3608 | if (hasdollarat) | |
3609 | *hasdollarat = hasdol || (l && l->next); | |
726f6388 | 3610 | free (temp); |
726f6388 JA |
3611 | if (l) |
3612 | { | |
ccc6cda3 JA |
3613 | /* The expansion of TEMP returned something. We need to treat things |
3614 | slightly differently if HASDOL is non-zero. */ | |
726f6388 | 3615 | temp = string_list (l); |
ccc6cda3 JA |
3616 | /* If l->next is not null, we know that TEMP contained "$@", since that |
3617 | is the only expansion that creates more than one word. */ | |
3618 | if ((hasdol && quoted) || l->next) | |
3619 | *qdollaratp = 1; | |
726f6388 JA |
3620 | dispose_words (l); |
3621 | } | |
ccc6cda3 | 3622 | else if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && hasdol) |
726f6388 | 3623 | { |
ccc6cda3 JA |
3624 | /* The brace expansion occurred between double quotes and there was |
3625 | a $@ in TEMP. It does not matter if the $@ is quoted, as long as | |
3626 | it does not expand to anything. In this case, we want to return | |
3627 | a quoted empty string. */ | |
726f6388 JA |
3628 | temp = xmalloc (2); |
3629 | temp[0] = CTLNUL; | |
3630 | temp[1] = '\0'; | |
3631 | } | |
3632 | else | |
3633 | temp = (char *)NULL; | |
3634 | ||
3635 | if (c == '-' || c == '+') | |
3636 | return (temp); | |
3637 | ||
3638 | /* c == '=' */ | |
ccc6cda3 | 3639 | t = temp ? savestring (temp) : savestring (""); |
726f6388 JA |
3640 | t1 = dequote_string (t); |
3641 | free (t); | |
3642 | bind_variable (name, t1); | |
3643 | free (t1); | |
3644 | return (temp); | |
3645 | } | |
3646 | ||
3647 | /* Deal with the right hand side of a ${name:?value} expansion in the case | |
3648 | that NAME is null or not set. If VALUE is non-null it is expanded and | |
3649 | used as the error message to print, otherwise a standard message is | |
3650 | printed. */ | |
3651 | static void | |
3652 | parameter_brace_expand_error (name, value) | |
3653 | char *name, *value; | |
3654 | { | |
ccc6cda3 JA |
3655 | WORD_LIST *l; |
3656 | char *temp; | |
3657 | ||
726f6388 JA |
3658 | if (value && *value) |
3659 | { | |
ccc6cda3 JA |
3660 | l = expand_string (value, 0); |
3661 | temp = string_list (l); | |
3662 | report_error ("%s: %s", name, temp ? temp : ""); /* XXX was value not "" */ | |
3663 | FREE (temp); | |
726f6388 JA |
3664 | dispose_words (l); |
3665 | } | |
3666 | else | |
3667 | report_error ("%s: parameter null or not set", name); | |
3668 | ||
3669 | /* Free the data we have allocated during this expansion, since we | |
3670 | are about to longjmp out. */ | |
3671 | free (name); | |
3672 | FREE (value); | |
3673 | } | |
3674 | ||
3675 | /* Return 1 if NAME is something for which parameter_brace_expand_length is | |
3676 | OK to do. */ | |
3677 | static int | |
3678 | valid_length_expression (name) | |
3679 | char *name; | |
3680 | { | |
3681 | return (!name[1] || /* ${#} */ | |
3682 | ((name[1] == '@' || name[1] == '*') && !name[2]) || /* ${#@}, ${#*} */ | |
cce855bc | 3683 | (member (name[1], "-?$!#") && !name[2]) || /* ${#-}, etc. */ |
726f6388 | 3684 | (digit (name[1]) && all_digits (name + 1)) || /* ${#11} */ |
ccc6cda3 JA |
3685 | #if defined (ARRAY_VARS) |
3686 | valid_array_reference (name + 1) || /* ${#a[7]} */ | |
3687 | #endif | |
726f6388 JA |
3688 | legal_identifier (name + 1)); /* ${#PS1} */ |
3689 | } | |
3690 | ||
3691 | /* Handle the parameter brace expansion that requires us to return the | |
3692 | length of a parameter. */ | |
3693 | static int | |
3694 | parameter_brace_expand_length (name) | |
3695 | char *name; | |
3696 | { | |
ccc6cda3 JA |
3697 | char *t, *newname; |
3698 | int number; | |
3699 | WORD_LIST *list; | |
3700 | #if defined (ARRAY_VARS) | |
3701 | SHELL_VAR *var; | |
3702 | #endif | |
3703 | ||
3704 | if (name[1] == '\0') /* ${#} */ | |
3705 | number = number_of_args (); | |
cce855bc JA |
3706 | else if ((name[1] == '@' || name[1] == '*') && name[2] == '\0') /* ${#@}, ${#*} */ |
3707 | number = number_of_args (); | |
3708 | else if (member (name[1], "-?$!#") && name[2] == '\0') | |
3709 | { | |
3710 | /* Take the lengths of some of the shell's special parameters. */ | |
3711 | switch (name[1]) | |
3712 | { | |
3713 | case '-': | |
3714 | t = which_set_flags (); | |
3715 | break; | |
3716 | case '?': | |
3717 | t = itos (last_command_exit_value); | |
3718 | break; | |
3719 | case '$': | |
3720 | t = itos (dollar_dollar_pid); | |
3721 | break; | |
3722 | case '!': | |
3723 | if (last_asynchronous_pid == NO_PID) | |
3724 | t = (char *)NULL; | |
3725 | else | |
3726 | t = itos ((int)last_asynchronous_pid); | |
3727 | break; | |
3728 | case '#': | |
3729 | t = itos (number_of_args ()); | |
3730 | break; | |
3731 | } | |
3732 | number = STRLEN (t); | |
3733 | FREE (t); | |
3734 | } | |
ccc6cda3 JA |
3735 | #if defined (ARRAY_VARS) |
3736 | else if (valid_array_reference (name + 1)) | |
3737 | number = array_length_reference (name + 1); | |
3738 | #endif /* ARRAY_VARS */ | |
cce855bc | 3739 | else |
ccc6cda3 JA |
3740 | { |
3741 | number = 0; | |
3742 | ||
3743 | if (digit (name[1])) /* ${#1} */ | |
3744 | { | |
3745 | t = get_dollar_var_value (atoi (name + 1)); | |
3746 | number = STRLEN (t); | |
3747 | FREE (t); | |
3748 | } | |
3749 | #if defined (ARRAY_VARS) | |
3750 | else if ((var = find_variable (name + 1)) && array_p (var)) | |
3751 | { | |
3752 | t = array_reference (array_cell (var), 0); | |
3753 | number = STRLEN (t); | |
3754 | } | |
3755 | #endif | |
3756 | else /* ${#PS1} */ | |
3757 | { | |
3758 | newname = savestring (name); | |
3759 | newname[0] = '$'; | |
3760 | list = expand_string (newname, Q_DOUBLE_QUOTES); | |
3761 | t = list ? string_list (list) : (char *)NULL; | |
3762 | free (newname); | |
3763 | if (list) | |
3764 | dispose_words (list); | |
3765 | ||
3766 | number = STRLEN (t); | |
3767 | FREE (t); | |
3768 | } | |
3769 | } | |
ccc6cda3 JA |
3770 | |
3771 | return (number); | |
3772 | } | |
3773 | ||
3774 | /* Verify and limit the start and end of the desired substring. If | |
3775 | VTYPE == 0, a regular shell variable is being used; if it is 1, | |
cce855bc | 3776 | then the positional parameters are being used; if it is 2, then |
e8ce775d JA |
3777 | VALUE is really a pointer to an array variable that should be used. |
3778 | Return value is 1 if both values were OK, 0 if there was a problem | |
3779 | with an invalid expression, or -1 if the values were out of range. */ | |
ccc6cda3 JA |
3780 | static int |
3781 | verify_substring_values (value, substr, vtype, e1p, e2p) | |
3782 | char *value, *substr; | |
3783 | int vtype, *e1p, *e2p; | |
3784 | { | |
3785 | char *t, *temp1; | |
d166f048 | 3786 | int len, expok; |
ccc6cda3 JA |
3787 | #if defined (ARRAY_VARS) |
3788 | ARRAY *a; | |
3789 | #endif | |
3790 | ||
3791 | t = strchr (substr, ':'); | |
3792 | if (t) | |
3793 | *t = '\0'; | |
d166f048 JA |
3794 | temp1 = maybe_expand_string (substr, Q_DOUBLE_QUOTES, expand_string); |
3795 | *e1p = evalexp (temp1, &expok); | |
ccc6cda3 | 3796 | free (temp1); |
d166f048 JA |
3797 | if (expok == 0) |
3798 | return (0); | |
ccc6cda3 JA |
3799 | |
3800 | switch (vtype) | |
3801 | { | |
3802 | case VT_VARIABLE: | |
d166f048 | 3803 | case VT_ARRAYMEMBER: |
ccc6cda3 JA |
3804 | len = strlen (value); |
3805 | break; | |
3806 | case VT_POSPARMS: | |
3807 | len = number_of_args () + 1; | |
3808 | break; | |
3809 | #if defined (ARRAY_VARS) | |
3810 | case VT_ARRAYVAR: | |
3811 | a = (ARRAY *)value; | |
3812 | len = array_num_elements (a) + 1; | |
3813 | break; | |
3814 | #endif | |
3815 | } | |
3816 | ||
3817 | if (*e1p < 0) /* negative offsets count from end */ | |
3818 | *e1p += len; | |
3819 | ||
d166f048 | 3820 | if (*e1p >= len || *e1p < 0) |
e8ce775d | 3821 | return (-1); |
d166f048 | 3822 | |
ccc6cda3 JA |
3823 | if (t) |
3824 | { | |
3825 | t++; | |
d166f048 | 3826 | temp1 = maybe_expand_string (t, Q_DOUBLE_QUOTES, expand_string); |
ccc6cda3 | 3827 | t[-1] = ':'; |
d166f048 | 3828 | *e2p = evalexp (temp1, &expok); |
ccc6cda3 | 3829 | free (temp1); |
d166f048 JA |
3830 | if (expok == 0) |
3831 | return (0); | |
ccc6cda3 JA |
3832 | if (*e2p < 0) |
3833 | { | |
3834 | internal_error ("%s: substring expression < 0", t); | |
3835 | return (0); | |
3836 | } | |
3837 | *e2p += *e1p; /* want E2 chars starting at E1 */ | |
3838 | if (*e2p > len) | |
3839 | *e2p = len; | |
3840 | } | |
3841 | else | |
3842 | *e2p = len; | |
3843 | ||
3844 | return (1); | |
3845 | } | |
3846 | ||
ccc6cda3 | 3847 | /* Return the type of variable specified by VARNAME (simple variable, |
cce855bc | 3848 | positional param, or array variable). Also return the value specified |
ccc6cda3 JA |
3849 | by VARNAME (value of a variable or a reference to an array element). */ |
3850 | static int | |
3851 | get_var_and_type (varname, value, varp, valp) | |
3852 | char *varname, *value; | |
3853 | SHELL_VAR **varp; | |
3854 | char **valp; | |
3855 | { | |
3856 | int vtype; | |
3857 | char *temp; | |
3858 | #if defined (ARRAY_VARS) | |
3859 | SHELL_VAR *v; | |
3860 | #endif | |
3861 | ||
3862 | vtype = (varname[0] == '@' || varname[0] == '*') && varname[1] == '\0'; /* VT_POSPARMS */ | |
3863 | *varp = (SHELL_VAR *)NULL; | |
3864 | ||
3865 | #if defined (ARRAY_VARS) | |
3866 | if (valid_array_reference (varname)) | |
3867 | { | |
3868 | v = array_variable_part (varname, &temp, (int *)0); | |
3869 | if (v && array_p (v)) | |
3870 | { | |
d166f048 | 3871 | if ((temp[0] == '@' || temp[0] == '*') && temp[1] == ']') |
ccc6cda3 JA |
3872 | { |
3873 | vtype = VT_ARRAYVAR; | |
3874 | *valp = (char *)array_cell (v); | |
3875 | } | |
3876 | else | |
3877 | { | |
d166f048 | 3878 | vtype = VT_ARRAYMEMBER; |
ccc6cda3 JA |
3879 | *valp = array_value (varname, 1); |
3880 | } | |
3881 | *varp = v; | |
3882 | } | |
3883 | else | |
3884 | return -1; | |
3885 | } | |
3886 | else if ((v = find_variable (varname)) && array_p (v)) | |
3887 | { | |
3888 | vtype = VT_VARIABLE; | |
3889 | *varp = v; | |
3890 | *valp = array_reference (array_cell (v), 0); | |
3891 | } | |
3892 | else | |
3893 | #endif | |
3894 | *valp = value; | |
3895 | ||
3896 | return vtype; | |
3897 | } | |
3898 | ||
cce855bc JA |
3899 | /******************************************************/ |
3900 | /* */ | |
3901 | /* Functions to extract substrings of variable values */ | |
3902 | /* */ | |
3903 | /******************************************************/ | |
3904 | ||
ccc6cda3 JA |
3905 | /* Process a variable substring expansion: ${name:e1[:e2]}. If VARNAME |
3906 | is `@', use the positional parameters; otherwise, use the value of | |
3907 | VARNAME. If VARNAME is an array variable, use the array elements. */ | |
3908 | ||
3909 | static char * | |
3910 | parameter_brace_substring (varname, value, substr, quoted) | |
3911 | char *varname, *value, *substr; | |
3912 | int quoted; | |
3913 | { | |
e8ce775d | 3914 | int e1, e2, vtype, r; |
ccc6cda3 JA |
3915 | char *temp, *val; |
3916 | SHELL_VAR *v; | |
3917 | ||
3918 | if (value == 0) | |
3919 | return ((char *)NULL); | |
3920 | ||
3921 | this_command_name = varname; | |
3922 | ||
3923 | vtype = get_var_and_type (varname, value, &v, &val); | |
3924 | if (vtype == -1) | |
3925 | return ((char *)NULL); | |
3926 | ||
e8ce775d JA |
3927 | r = verify_substring_values (val, substr, vtype, &e1, &e2); |
3928 | if (r <= 0) | |
d166f048 JA |
3929 | { |
3930 | if (val && vtype == VT_ARRAYMEMBER) | |
3931 | free (val); | |
e8ce775d | 3932 | return ((r == 0) ? &expand_param_error : (char *)NULL); |
d166f048 | 3933 | } |
ccc6cda3 JA |
3934 | |
3935 | switch (vtype) | |
3936 | { | |
3937 | case VT_VARIABLE: | |
d166f048 | 3938 | case VT_ARRAYMEMBER: |
ccc6cda3 JA |
3939 | temp = quoted ? quoted_substring (value, e1, e2) : substring (value, e1, e2); |
3940 | break; | |
3941 | case VT_POSPARMS: | |
3942 | temp = pos_params (varname, e1, e2, quoted); | |
3943 | break; | |
3944 | #if defined (ARRAY_VARS) | |
3945 | case VT_ARRAYVAR: | |
3946 | temp = array_subrange (array_cell (v), e1, e2, quoted); | |
3947 | break; | |
3948 | #endif | |
3949 | } | |
3950 | ||
3951 | return temp; | |
3952 | } | |
3953 | ||
cce855bc JA |
3954 | /****************************************************************/ |
3955 | /* */ | |
3956 | /* Functions to perform pattern substitution on variable values */ | |
3957 | /* */ | |
3958 | /****************************************************************/ | |
3959 | ||
ccc6cda3 JA |
3960 | char * |
3961 | pat_subst (string, pat, rep, mflags) | |
3962 | char *string, *pat, *rep; | |
3963 | int mflags; | |
3964 | { | |
3965 | char *ret, *s, *e, *str; | |
3966 | int rsize, rptr, l, replen, mtype; | |
3967 | ||
b72432fd JA |
3968 | mtype = mflags & MATCH_TYPEMASK; |
3969 | ||
3970 | /* Special cases: | |
3971 | * 1. A null pattern with mtype == MATCH_BEG means to prefix STRING | |
3972 | * with REP and return the result. | |
3973 | * 2. A null pattern with mtype == MATCH_END means to append REP to | |
3974 | * STRING and return the result. | |
3975 | */ | |
3976 | if ((pat == 0 || *pat == 0) && (mtype == MATCH_BEG || mtype == MATCH_END)) | |
3977 | { | |
3978 | replen = STRLEN (rep); | |
3979 | l = strlen (string); | |
3980 | ret = xmalloc (replen + l + 2); | |
3981 | if (mtype == MATCH_BEG) | |
3982 | { | |
3983 | strcpy (ret, rep); | |
3984 | strcpy (ret + replen, string); | |
3985 | } | |
3986 | else | |
3987 | { | |
3988 | strcpy (ret, string); | |
3989 | strcpy (ret + l, rep); | |
3990 | } | |
3991 | return (ret); | |
3992 | } | |
3993 | ||
ccc6cda3 JA |
3994 | ret = xmalloc (rsize = 64); |
3995 | ret[0] = '\0'; | |
3996 | ||
ccc6cda3 JA |
3997 | for (replen = STRLEN (rep), rptr = 0, str = string;;) |
3998 | { | |
3999 | if (match_pattern (str, pat, mtype, &s, &e) == 0) | |
4000 | break; | |
4001 | l = s - str; | |
4002 | RESIZE_MALLOCED_BUFFER (ret, rptr, (l + replen), rsize, 64); | |
4003 | ||
4004 | /* OK, now copy the leading unmatched portion of the string (from | |
4005 | str to s) to ret starting at rptr (the current offset). Then copy | |
4006 | the replacement string at ret + rptr + (s - str). Increment | |
4007 | rptr (if necessary) and str and go on. */ | |
4008 | if (l) | |
4009 | { | |
4010 | strncpy (ret + rptr, str, l); | |
4011 | rptr += l; | |
4012 | } | |
4013 | if (replen) | |
4014 | { | |
4015 | strncpy (ret + rptr, rep, replen); | |
4016 | rptr += replen; | |
4017 | } | |
4018 | str = e; /* e == end of match */ | |
4019 | if (((mflags & MATCH_GLOBREP) == 0) || mtype != MATCH_ANY) | |
4020 | break; | |
4021 | } | |
4022 | ||
4023 | /* Now copy the unmatched portion of the input string */ | |
4024 | if (*str) | |
d166f048 JA |
4025 | { |
4026 | RESIZE_MALLOCED_BUFFER (ret, rptr, STRLEN(str) + 1, rsize, 64); | |
4027 | strcpy (ret + rptr, str); | |
4028 | } | |
ccc6cda3 JA |
4029 | else |
4030 | ret[rptr] = '\0'; | |
4031 | ||
4032 | return ret; | |
4033 | } | |
4034 | ||
4035 | /* Do pattern match and replacement on the positional parameters. */ | |
4036 | static char * | |
4037 | pos_params_pat_subst (string, pat, rep, mflags) | |
4038 | char *string, *pat, *rep; | |
4039 | int mflags; | |
4040 | { | |
4041 | WORD_LIST *save, *params; | |
4042 | WORD_DESC *w; | |
4043 | char *ret; | |
4044 | ||
4045 | save = params = list_rest_of_args (); | |
4046 | if (save == 0) | |
4047 | return ((char *)NULL); | |
4048 | ||
4049 | for ( ; params; params = params->next) | |
4050 | { | |
4051 | ret = pat_subst (params->word->word, pat, rep, mflags); | |
4052 | w = make_bare_word (ret); | |
4053 | dispose_word (params->word); | |
4054 | params->word = w; | |
4055 | FREE (ret); | |
4056 | } | |
4057 | ||
4058 | ret = string_list ((mflags & MATCH_QUOTED) ? quote_list (save) : save); | |
4059 | dispose_words (save); | |
4060 | ||
4061 | return (ret); | |
4062 | } | |
4063 | ||
cce855bc JA |
4064 | /* Perform pattern substitution on VALUE, which is the expansion of |
4065 | VARNAME. PATSUB is an expression supplying the pattern to match | |
4066 | and the string to substitute. QUOTED is a flags word containing | |
4067 | the type of quoting currently in effect. */ | |
ccc6cda3 JA |
4068 | static char * |
4069 | parameter_brace_patsub (varname, value, patsub, quoted) | |
4070 | char *varname, *value, *patsub; | |
4071 | int quoted; | |
4072 | { | |
4073 | int vtype, mflags; | |
4074 | char *val, *temp, *pat, *rep, *p; | |
4075 | SHELL_VAR *v; | |
4076 | ||
4077 | if (value == 0) | |
4078 | return ((char *)NULL); | |
4079 | ||
4080 | this_command_name = varname; | |
4081 | ||
4082 | vtype = get_var_and_type (varname, value, &v, &val); | |
4083 | if (vtype == -1) | |
4084 | return ((char *)NULL); | |
4085 | ||
4086 | mflags = 0; | |
4087 | if (*patsub == '/') | |
4088 | { | |
4089 | mflags |= MATCH_GLOBREP; | |
4090 | patsub++; | |
4091 | } | |
4092 | ||
4093 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
4094 | mflags |= MATCH_QUOTED; | |
4095 | ||
4096 | if (rep = quoted_strchr (patsub, '/', ST_BACKSL)) | |
4097 | *rep++ = '\0'; | |
4098 | else | |
4099 | rep = (char *)NULL; | |
4100 | ||
4101 | if (rep && *rep == '\0') | |
4102 | rep = (char *)NULL; | |
4103 | ||
4104 | /* Expand PAT and REP for command, variable and parameter, arithmetic, | |
4105 | and process substitution. Also perform quote removal. Do not | |
4106 | perform word splitting or filename generation. */ | |
cce855bc | 4107 | #if 0 |
ccc6cda3 | 4108 | pat = maybe_expand_string (patsub, quoted, expand_string_unsplit); |
cce855bc JA |
4109 | #else |
4110 | pat = maybe_expand_string (patsub, (quoted & ~Q_DOUBLE_QUOTES), expand_string_unsplit); | |
4111 | #endif | |
ccc6cda3 | 4112 | if (rep) |
d166f048 JA |
4113 | { |
4114 | if ((mflags & MATCH_QUOTED) == 0) | |
4115 | rep = maybe_expand_string (rep, quoted, expand_string_unsplit); | |
4116 | else | |
4117 | rep = expand_string_to_string (rep, quoted, expand_string_unsplit); | |
4118 | } | |
ccc6cda3 JA |
4119 | |
4120 | p = pat; | |
d166f048 | 4121 | if (pat && pat[0] == '#') |
ccc6cda3 JA |
4122 | { |
4123 | mflags |= MATCH_BEG; | |
4124 | p++; | |
4125 | } | |
d166f048 | 4126 | else if (pat && pat[0] == '%') |
ccc6cda3 JA |
4127 | { |
4128 | mflags |= MATCH_END; | |
4129 | p++; | |
4130 | } | |
4131 | else | |
4132 | mflags |= MATCH_ANY; | |
4133 | ||
cce855bc JA |
4134 | /* OK, we now want to substitute REP for PAT in VAL. If |
4135 | flags & MATCH_GLOBREP is non-zero, the substitution is done | |
4136 | everywhere, otherwise only the first occurrence of PAT is | |
4137 | replaced. */ | |
ccc6cda3 JA |
4138 | switch (vtype) |
4139 | { | |
4140 | case VT_VARIABLE: | |
d166f048 | 4141 | case VT_ARRAYMEMBER: |
ccc6cda3 JA |
4142 | temp = pat_subst (val, p, rep, mflags); |
4143 | break; | |
4144 | case VT_POSPARMS: | |
4145 | temp = pos_params_pat_subst (val, p, rep, mflags); | |
4146 | break; | |
4147 | #if defined (ARRAY_VARS) | |
4148 | case VT_ARRAYVAR: | |
4149 | temp = array_pat_subst (array_cell (v), p, rep, mflags); | |
4150 | break; | |
4151 | #endif | |
4152 | } | |
4153 | ||
d166f048 JA |
4154 | if (val && v && array_p (v) && vtype == VT_ARRAYMEMBER) |
4155 | free (val); | |
4156 | ||
ccc6cda3 JA |
4157 | FREE (pat); |
4158 | FREE (rep); | |
4159 | ||
4160 | return temp; | |
4161 | } | |
4162 | ||
cce855bc JA |
4163 | /****************************************************************/ |
4164 | /* */ | |
4165 | /* Functions to perform parameter expansion on a string */ | |
4166 | /* */ | |
4167 | /****************************************************************/ | |
4168 | ||
ccc6cda3 JA |
4169 | /* ${[#][!]name[[:]#[#]%[%]-=?+[word][:e1[:e2]]]} */ |
4170 | static char * | |
4171 | parameter_brace_expand (string, indexp, quoted, quoted_dollar_atp, contains_dollar_at) | |
4172 | char *string; | |
4173 | int *indexp, quoted, *quoted_dollar_atp, *contains_dollar_at; | |
4174 | { | |
4175 | int check_nullness, var_is_set, var_is_null, var_is_special; | |
4176 | int want_substring, want_indir, want_patsub; | |
4177 | char *name, *value, *temp, *temp1; | |
4178 | int t_index, sindex, c, number; | |
4179 | ||
ccc6cda3 JA |
4180 | value = (char *)NULL; |
4181 | var_is_set = var_is_null = var_is_special = check_nullness = 0; | |
4182 | want_substring = want_indir = want_patsub = 0; | |
4183 | ||
cce855bc JA |
4184 | sindex = *indexp; |
4185 | t_index = ++sindex; | |
4186 | name = string_extract (string, &t_index, "#%:-=?+/}", 1); | |
4187 | ||
4188 | /* If the name really consists of a special variable, then make sure | |
4189 | that we have the entire name. We don't allow indirect references | |
4190 | to special variables except `#', `?', `@' and `*'. */ | |
4191 | if ((sindex == t_index && | |
ccc6cda3 JA |
4192 | (string[t_index] == '-' || |
4193 | string[t_index] == '?' || | |
cce855bc JA |
4194 | string[t_index] == '#')) || |
4195 | (sindex == t_index - 1 && string[sindex] == '!' && | |
4196 | (string[t_index] == '#' || | |
4197 | string[t_index] == '?' || | |
4198 | string[t_index] == '@' || | |
4199 | string[t_index] == '*'))) | |
ccc6cda3 JA |
4200 | { |
4201 | t_index++; | |
4202 | free (name); | |
4203 | temp1 = string_extract (string, &t_index, "#%:-=?+/}", 0); | |
4204 | name = xmalloc (3 + (strlen (temp1))); | |
4205 | *name = string[sindex]; | |
4206 | if (string[sindex] == '!') | |
4207 | { | |
cce855bc JA |
4208 | /* indirect reference of $#, $?, $@, or $* */ |
4209 | name[1] = string[sindex + 1]; | |
4210 | strcpy (name + 2, temp1); | |
ccc6cda3 | 4211 | } |
cce855bc | 4212 | else |
ccc6cda3 JA |
4213 | strcpy (name + 1, temp1); |
4214 | free (temp1); | |
4215 | } | |
4216 | sindex = t_index; | |
4217 | ||
4218 | /* Find out what character ended the variable name. Then | |
4219 | do the appropriate thing. */ | |
4220 | if (c = string[sindex]) | |
4221 | sindex++; | |
4222 | ||
4223 | /* If c is followed by one of the valid parameter expansion | |
4224 | characters, move past it as normal. If not, assume that | |
4225 | a substring specification is being given, and do not move | |
4226 | past it. */ | |
4227 | if (c == ':' && member (string[sindex], "-=?+")) | |
4228 | { | |
4229 | check_nullness++; | |
4230 | if (c = string[sindex]) | |
4231 | sindex++; | |
4232 | } | |
cce855bc | 4233 | else if (c == ':' && string[sindex] != RBRACE) |
ccc6cda3 | 4234 | want_substring = 1; |
cce855bc | 4235 | else if (c == '/' && string[sindex] != RBRACE) |
ccc6cda3 JA |
4236 | want_patsub = 1; |
4237 | ||
cce855bc JA |
4238 | /* Catch the valid and invalid brace expressions that made it through the |
4239 | tests above. */ | |
4240 | /* ${#-} is a valid expansion and means to take the length of $-. | |
4241 | Similarly for ${#?} and ${##}... */ | |
4242 | if (name[0] == '#' && name[1] == '\0' && check_nullness == 0 && | |
4243 | member (c, "-?#") && string[sindex] == RBRACE) | |
4244 | { | |
4245 | name = xrealloc (name, 3); | |
4246 | name[1] = c; | |
4247 | name[2] = '\0'; | |
4248 | c = string[sindex++]; | |
4249 | } | |
4250 | ||
4251 | /* ...but ${#%}, ${#:}, ${#=}, ${#+}, and ${#/} are errors. */ | |
4252 | if (name[0] == '#' && name[1] == '\0' && check_nullness == 0 && | |
4253 | member (c, "%:=+/") && string[sindex] == RBRACE) | |
4254 | { | |
4255 | temp = (char *)NULL; | |
4256 | goto bad_substitution; | |
4257 | } | |
4258 | ||
4259 | /* Indirect expansion begins with a `!'. A valid indirect expansion is | |
4260 | either a variable name, one of the positional parameters or a special | |
4261 | variable that expands to one of the positional parameters. */ | |
4262 | want_indir = *name == '!' && | |
4263 | (legal_variable_starter (name[1]) || digit (name[1]) || member (name[1], "#?@*")); | |
ccc6cda3 JA |
4264 | |
4265 | /* Determine the value of this variable. */ | |
4266 | ||
cce855bc | 4267 | /* Check for special variables, directly referenced. */ |
ccc6cda3 JA |
4268 | if ((digit (*name) && all_digits (name)) || |
4269 | (name[1] == '\0' && member (*name, "#-?$!@*")) || | |
cce855bc | 4270 | (want_indir && name[2] == '\0' && member (name[1], "#?@*"))) |
ccc6cda3 JA |
4271 | var_is_special++; |
4272 | ||
cce855bc JA |
4273 | /* Check for special expansion things, like the length of a parameter */ |
4274 | if (*name == '#' && name[1]) | |
ccc6cda3 | 4275 | { |
cce855bc JA |
4276 | /* If we are not pointing at the character just after the |
4277 | closing brace, then we haven't gotten all of the name. | |
4278 | Since it begins with a special character, this is a bad | |
4279 | substitution. Also check NAME for validity before trying | |
4280 | to go on. */ | |
4281 | if (string[sindex - 1] != RBRACE || (valid_length_expression (name) == 0)) | |
ccc6cda3 JA |
4282 | { |
4283 | temp = (char *)NULL; | |
4284 | goto bad_substitution; | |
4285 | } | |
4286 | ||
4287 | number = parameter_brace_expand_length (name); | |
4288 | free (name); | |
4289 | ||
4290 | *indexp = sindex; | |
4291 | return ((number < 0) ? &expand_param_error : itos (number)); | |
4292 | } | |
4293 | ||
4294 | /* ${@} is identical to $@. */ | |
4295 | if (name[0] == '@' && name[1] == '\0') | |
4296 | { | |
4297 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) | |
4298 | *quoted_dollar_atp = 1; | |
4299 | ||
4300 | if (contains_dollar_at) | |
4301 | *contains_dollar_at = 1; | |
4302 | } | |
4303 | ||
4304 | /* Make sure that NAME is valid before trying to go on. */ | |
4305 | if (valid_brace_expansion_word (want_indir ? name + 1 : name, | |
4306 | var_is_special) == 0) | |
4307 | { | |
4308 | temp = (char *)NULL; | |
4309 | goto bad_substitution; | |
4310 | } | |
4311 | ||
4312 | if (want_indir) | |
4313 | temp = parameter_brace_expand_indir (name + 1, var_is_special, quoted); | |
4314 | else | |
4315 | temp = parameter_brace_expand_word (name, var_is_special, quoted); | |
4316 | ||
4317 | #if defined (ARRAY_VARS) | |
cce855bc | 4318 | #if 0 |
ccc6cda3 | 4319 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && valid_array_reference (name)) |
cce855bc JA |
4320 | #else |
4321 | if (valid_array_reference (name)) | |
4322 | #endif | |
ccc6cda3 JA |
4323 | { |
4324 | temp1 = strchr (name, '['); | |
4325 | if (temp1 && temp1[1] == '@' && temp1[2] == ']') | |
4326 | { | |
4327 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && quoted_dollar_atp) | |
4328 | *quoted_dollar_atp = 1; | |
4329 | if (contains_dollar_at) | |
4330 | *contains_dollar_at = 1; | |
cce855bc JA |
4331 | } /* [ */ |
4332 | /* ${array[*]}, when unquoted, should be treated like ${array[@]}, | |
4333 | which should result in separate words even when IFS is unset. */ | |
4334 | if (temp1 && temp1[1] == '*' && temp1[2] == ']' && quoted == 0) | |
4335 | { | |
4336 | if (contains_dollar_at) | |
4337 | *contains_dollar_at = 1; | |
ccc6cda3 JA |
4338 | } |
4339 | } | |
4340 | #endif | |
4341 | ||
4342 | var_is_set = temp != (char *)0; | |
4343 | var_is_null = check_nullness && (var_is_set == 0 || *temp == 0); | |
4344 | ||
4345 | /* Get the rest of the stuff inside the braces. */ | |
cce855bc | 4346 | if (c && c != RBRACE) |
ccc6cda3 JA |
4347 | { |
4348 | /* Extract the contents of the ${ ... } expansion | |
4349 | according to the Posix.2 rules. */ | |
4350 | value = extract_dollar_brace_string (string, &sindex, quoted); | |
cce855bc | 4351 | if (string[sindex] == RBRACE) |
ccc6cda3 JA |
4352 | sindex++; |
4353 | else | |
4354 | goto bad_substitution; | |
4355 | } | |
4356 | else | |
4357 | value = (char *)NULL; | |
726f6388 | 4358 | |
ccc6cda3 JA |
4359 | *indexp = sindex; |
4360 | ||
4361 | /* If this is a substring spec, process it and add the result. */ | |
4362 | if (want_substring) | |
726f6388 | 4363 | { |
ccc6cda3 JA |
4364 | temp1 = parameter_brace_substring (name, temp, value, quoted); |
4365 | FREE (name); | |
4366 | FREE (value); | |
4367 | FREE (temp); | |
4368 | return (temp1); | |
726f6388 | 4369 | } |
ccc6cda3 | 4370 | else if (want_patsub) |
726f6388 | 4371 | { |
ccc6cda3 JA |
4372 | temp1 = parameter_brace_patsub (name, temp, value, quoted); |
4373 | FREE (name); | |
4374 | FREE (value); | |
4375 | FREE (temp); | |
4376 | return (temp1); | |
4377 | } | |
726f6388 | 4378 | |
ccc6cda3 JA |
4379 | /* Do the right thing based on which character ended the variable name. */ |
4380 | switch (c) | |
4381 | { | |
4382 | default: | |
4383 | case '\0': | |
4384 | bad_substitution: | |
4385 | report_error ("%s: bad substitution", string ? string : "??"); | |
4386 | FREE (value); | |
4387 | FREE (temp); | |
4388 | free (name); | |
4389 | return &expand_param_error; | |
4390 | ||
cce855bc | 4391 | case RBRACE: |
ccc6cda3 JA |
4392 | if (var_is_set == 0 && unbound_vars_is_error) |
4393 | { | |
4394 | report_error ("%s: unbound variable", name); | |
4395 | FREE (value); | |
4396 | FREE (temp); | |
4397 | free (name); | |
4398 | last_command_exit_value = EXECUTION_FAILURE; | |
d166f048 | 4399 | return (interactive_shell ? &expand_param_error : &expand_param_fatal); |
726f6388 | 4400 | } |
ccc6cda3 | 4401 | break; |
726f6388 | 4402 | |
ccc6cda3 JA |
4403 | case '#': /* ${param#[#]pattern} */ |
4404 | case '%': /* ${param%[%]pattern} */ | |
4405 | if (value == 0 || *value == '\0' || temp == 0 || *temp == '\0') | |
4406 | { | |
4407 | FREE (value); | |
4408 | break; | |
4409 | } | |
4410 | if ((name[0] == '@' || name[0] == '*') && name[1] == '\0') | |
4411 | temp1 = parameter_list_remove_pattern (value, name[0], c, quoted); | |
4412 | #if defined (ARRAY_VARS) | |
4413 | else if (valid_array_reference (name)) | |
4414 | temp1 = array_remove_pattern (value, name, temp, c, quoted); | |
4415 | #endif | |
4416 | else | |
4417 | temp1 = parameter_brace_remove_pattern (value, temp, c, quoted); | |
4418 | free (temp); | |
4419 | free (value); | |
4420 | temp = temp1; | |
4421 | break; | |
4422 | ||
4423 | case '-': | |
4424 | case '=': | |
4425 | case '?': | |
4426 | case '+': | |
4427 | if (var_is_set && var_is_null == 0) | |
4428 | { | |
4429 | /* We don't want the value of the named variable for | |
4430 | anything, just the value of the right hand side. */ | |
4431 | if (c == '+') | |
4432 | { | |
4433 | FREE (temp); | |
4434 | if (value) | |
4435 | { | |
4436 | temp = parameter_brace_expand_rhs (name, value, c, | |
4437 | quoted, | |
4438 | quoted_dollar_atp, | |
4439 | contains_dollar_at); | |
4440 | free (value); | |
4441 | } | |
4442 | else | |
4443 | temp = (char *)NULL; | |
4444 | } | |
4445 | else | |
4446 | { | |
4447 | FREE (value); | |
4448 | } | |
4449 | /* Otherwise do nothing; just use the value in TEMP. */ | |
726f6388 | 4450 | } |
ccc6cda3 JA |
4451 | else /* VAR not set or VAR is NULL. */ |
4452 | { | |
4453 | FREE (temp); | |
4454 | temp = (char *)NULL; | |
4455 | if (c == '=' && var_is_special) | |
4456 | { | |
4457 | report_error ("$%s: cannot assign in this way", name); | |
4458 | free (name); | |
4459 | free (value); | |
4460 | return &expand_param_error; | |
4461 | } | |
4462 | else if (c == '?') | |
4463 | { | |
4464 | parameter_brace_expand_error (name, value); | |
4465 | return (interactive ? &expand_param_error : &expand_param_fatal); | |
4466 | } | |
4467 | else if (c != '+') | |
4468 | temp = parameter_brace_expand_rhs (name, value, c, quoted, | |
4469 | quoted_dollar_atp, | |
4470 | contains_dollar_at); | |
4471 | free (value); | |
726f6388 | 4472 | } |
ccc6cda3 | 4473 | break; |
726f6388 | 4474 | } |
ccc6cda3 JA |
4475 | free (name); |
4476 | return (temp); | |
726f6388 JA |
4477 | } |
4478 | ||
cce855bc JA |
4479 | /* Expand a single ${xxx} expansion. The braces are optional. When |
4480 | the braces are used, parameter_brace_expand() does the work, | |
4481 | possibly calling param_expand recursively. */ | |
4482 | static char * | |
4483 | param_expand (string, sindex, quoted, expanded_something, | |
4484 | contains_dollar_at, quoted_dollar_at_p, had_quoted_null_p, | |
4485 | pflags) | |
4486 | char *string; | |
4487 | int *sindex, quoted, *expanded_something, *contains_dollar_at; | |
4488 | int *quoted_dollar_at_p, *had_quoted_null_p, pflags; | |
4489 | { | |
4490 | char *temp, *temp1; | |
4491 | int zindex, number, c, t_index, expok; | |
4492 | SHELL_VAR *var; | |
4493 | WORD_LIST *list, *tlist; | |
4494 | ||
4495 | zindex = *sindex; | |
4496 | c = string[++zindex]; | |
4497 | ||
4498 | temp = (char *)NULL; | |
4499 | ||
4500 | /* Do simple cases first. Switch on what follows '$'. */ | |
4501 | switch (c) | |
4502 | { | |
4503 | /* $0 .. $9? */ | |
4504 | case '0': | |
4505 | case '1': | |
4506 | case '2': | |
4507 | case '3': | |
4508 | case '4': | |
4509 | case '5': | |
4510 | case '6': | |
4511 | case '7': | |
4512 | case '8': | |
4513 | case '9': | |
4514 | temp1 = dollar_vars[digit_value (c)]; | |
4515 | if (unbound_vars_is_error && temp1 == (char *)NULL) | |
4516 | { | |
4517 | report_error ("$%c: unbound variable", c); | |
4518 | last_command_exit_value = EXECUTION_FAILURE; | |
4519 | return (interactive_shell ? &expand_param_error : &expand_param_fatal); | |
4520 | } | |
4521 | temp = temp1 ? savestring (temp1) : (char *)NULL; | |
4522 | break; | |
4523 | ||
4524 | /* $$ -- pid of the invoking shell. */ | |
4525 | case '$': | |
4526 | temp = itos (dollar_dollar_pid); | |
4527 | break; | |
4528 | ||
4529 | /* $# -- number of positional parameters. */ | |
4530 | case '#': | |
4531 | temp = itos (number_of_args ()); | |
4532 | break; | |
4533 | ||
4534 | /* $? -- return value of the last synchronous command. */ | |
4535 | case '?': | |
4536 | temp = itos (last_command_exit_value); | |
4537 | break; | |
4538 | ||
4539 | /* $- -- flags supplied to the shell on invocation or by `set'. */ | |
4540 | case '-': | |
4541 | temp = which_set_flags (); | |
4542 | break; | |
4543 | ||
4544 | /* $! -- Pid of the last asynchronous command. */ | |
4545 | case '!': | |
4546 | /* If no asynchronous pids have been created, expand to nothing. | |
4547 | If `set -u' has been executed, and no async processes have | |
4548 | been created, this is an expansion error. */ | |
4549 | if (last_asynchronous_pid == NO_PID) | |
4550 | { | |
4551 | if (expanded_something) | |
4552 | *expanded_something = 0; | |
4553 | temp = (char *)NULL; | |
4554 | if (unbound_vars_is_error) | |
4555 | { | |
4556 | report_error ("$%c: unbound variable", c); | |
4557 | last_command_exit_value = EXECUTION_FAILURE; | |
4558 | return (interactive_shell ? &expand_param_error : &expand_param_fatal); | |
4559 | } | |
4560 | } | |
4561 | else | |
4562 | temp = itos ((int)last_asynchronous_pid); | |
4563 | break; | |
4564 | ||
4565 | /* The only difference between this and $@ is when the arg is quoted. */ | |
4566 | case '*': /* `$*' */ | |
4567 | list = list_rest_of_args (); | |
4568 | ||
4569 | /* If there are no command-line arguments, this should just | |
4570 | disappear if there are other characters in the expansion, | |
4571 | even if it's quoted. */ | |
4572 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && list == 0) | |
4573 | temp = (char *)NULL; | |
4574 | else if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
4575 | { | |
4576 | /* If we have "$*" we want to make a string of the positional | |
4577 | parameters, separated by the first character of $IFS, and | |
4578 | quote the whole string, including the separators. If IFS | |
4579 | is unset, the parameters are separated by ' '; if $IFS is | |
4580 | null, the parameters are concatenated. */ | |
4581 | temp = string_list_dollar_star (list); | |
4582 | temp1 = quote_string (temp); | |
4583 | free (temp); | |
4584 | temp = temp1; | |
4585 | } | |
4586 | else | |
4587 | { | |
4588 | /* If the $* is not quoted it is identical to $@ */ | |
4589 | temp = string_list_dollar_at (list, quoted); | |
4590 | if (contains_dollar_at) | |
4591 | *contains_dollar_at = 1; | |
4592 | } | |
4593 | ||
4594 | dispose_words (list); | |
4595 | break; | |
4596 | ||
4597 | /* When we have "$@" what we want is "$1" "$2" "$3" ... This | |
4598 | means that we have to turn quoting off after we split into | |
4599 | the individually quoted arguments so that the final split | |
4600 | on the first character of $IFS is still done. */ | |
4601 | case '@': /* `$@' */ | |
4602 | list = list_rest_of_args (); | |
4603 | ||
4604 | /* We want to flag the fact that we saw this. We can't turn | |
4605 | off quoting entirely, because other characters in the | |
4606 | string might need it (consider "\"$@\""), but we need some | |
4607 | way to signal that the final split on the first character | |
4608 | of $IFS should be done, even though QUOTED is 1. */ | |
4609 | if (quoted_dollar_at_p && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) | |
4610 | *quoted_dollar_at_p = 1; | |
4611 | if (contains_dollar_at) | |
4612 | *contains_dollar_at = 1; | |
4613 | ||
4614 | /* We want to separate the positional parameters with the first | |
4615 | character of $IFS in case $IFS is something other than a space. | |
4616 | We also want to make sure that splitting is done no matter what -- | |
4617 | according to POSIX.2, this expands to a list of the positional | |
4618 | parameters no matter what IFS is set to. */ | |
4619 | temp = string_list_dollar_at (list, quoted); | |
4620 | ||
4621 | dispose_words (list); | |
4622 | break; | |
4623 | ||
4624 | case LBRACE: | |
4625 | temp = parameter_brace_expand (string, &zindex, quoted, | |
4626 | quoted_dollar_at_p, | |
4627 | contains_dollar_at); | |
4628 | if (temp == &expand_param_error || temp == &expand_param_fatal) | |
4629 | return (temp); | |
4630 | ||
4631 | /* XXX */ | |
4632 | /* quoted nulls should be removed if there is anything else | |
4633 | in the string. */ | |
4634 | /* Note that we saw the quoted null so we can add one back at | |
4635 | the end of this function if there are no other characters | |
4636 | in the string, discard TEMP, and go on. */ | |
4637 | if (temp && QUOTED_NULL (temp)) | |
4638 | { | |
4639 | if (had_quoted_null_p) | |
4640 | *had_quoted_null_p = 1; | |
4641 | free (temp); | |
4642 | temp = (char *)NULL; | |
4643 | } | |
4644 | ||
4645 | goto return0; | |
4646 | ||
4647 | /* Do command or arithmetic substitution. */ | |
4648 | case LPAREN: | |
4649 | /* We have to extract the contents of this paren substitution. */ | |
4650 | t_index = zindex + 1; | |
4651 | temp = extract_command_subst (string, &t_index); | |
4652 | zindex = t_index; | |
4653 | ||
4654 | /* For Posix.2-style `$(( ))' arithmetic substitution, | |
4655 | extract the expression and pass it to the evaluator. */ | |
4656 | if (temp && *temp == LPAREN) | |
4657 | { | |
4658 | char *temp2; | |
4659 | temp1 = temp + 1; | |
4660 | temp2 = savestring (temp1); | |
4661 | t_index = strlen (temp2) - 1; | |
4662 | ||
4663 | if (temp2[t_index] != RPAREN) | |
4664 | { | |
4665 | free (temp2); | |
4666 | goto comsub; | |
4667 | } | |
4668 | ||
4669 | /* Cut off ending `)' */ | |
4670 | temp2[t_index] = '\0'; | |
4671 | ||
4672 | /* Expand variables found inside the expression. */ | |
4673 | temp1 = maybe_expand_string (temp2, Q_DOUBLE_QUOTES, expand_string); | |
4674 | free (temp2); | |
4675 | ||
4676 | arithsub: | |
4677 | /* No error messages. */ | |
4678 | this_command_name = (char *)NULL; | |
4679 | number = evalexp (temp1, &expok); | |
4680 | free (temp); | |
4681 | free (temp1); | |
4682 | if (expok == 0) | |
4683 | { | |
4684 | if (interactive_shell == 0 && posixly_correct) | |
4685 | { | |
4686 | last_command_exit_value = EXECUTION_FAILURE; | |
4687 | return (&expand_param_fatal); | |
4688 | } | |
4689 | else | |
4690 | return (&expand_param_error); | |
4691 | } | |
4692 | temp = itos (number); | |
4693 | break; | |
4694 | } | |
4695 | ||
4696 | comsub: | |
4697 | temp1 = command_substitute (temp, quoted); | |
4698 | FREE (temp); | |
4699 | temp = temp1; | |
4700 | break; | |
4701 | ||
4702 | /* Do POSIX.2d9-style arithmetic substitution. This will probably go | |
4703 | away in a future bash release. */ | |
4704 | case '[': | |
4705 | /* We have to extract the contents of this arithmetic substitution. */ | |
4706 | t_index = zindex + 1; | |
4707 | temp = extract_arithmetic_subst (string, &t_index); | |
4708 | zindex = t_index; | |
4709 | ||
4710 | /* Do initial variable expansion. */ | |
4711 | temp1 = maybe_expand_string (temp, Q_DOUBLE_QUOTES, expand_string); | |
4712 | ||
4713 | goto arithsub; | |
4714 | ||
4715 | default: | |
4716 | /* Find the variable in VARIABLE_LIST. */ | |
4717 | temp = (char *)NULL; | |
4718 | ||
4719 | for (t_index = zindex; (c = string[zindex]) && legal_variable_char (c); zindex++) | |
4720 | ; | |
4721 | temp1 = (zindex > t_index) ? substring (string, t_index, zindex) : (char *)NULL; | |
4722 | ||
4723 | /* If this isn't a variable name, then just output the `$'. */ | |
4724 | if (temp1 == 0 || *temp1 == '\0') | |
4725 | { | |
4726 | FREE (temp1); | |
4727 | temp = xmalloc (2); | |
4728 | temp[0] = '$'; | |
4729 | temp[1] = '\0'; | |
4730 | if (expanded_something) | |
4731 | *expanded_something = 0; | |
4732 | goto return0; | |
4733 | } | |
4734 | ||
4735 | /* If the variable exists, return its value cell. */ | |
4736 | var = find_variable (temp1); | |
4737 | ||
4738 | if (var && invisible_p (var) == 0 && value_cell (var)) | |
4739 | { | |
4740 | #if defined (ARRAY_VARS) | |
4741 | if (array_p (var)) | |
4742 | { | |
4743 | temp = array_reference (array_cell (var), 0); | |
4744 | if (temp) | |
4745 | temp = quote_escapes (temp); | |
4746 | } | |
4747 | else | |
4748 | #endif | |
4749 | temp = quote_escapes (value_cell (var)); | |
4750 | free (temp1); | |
4751 | if (tempvar_p (var)) /* XXX */ | |
4752 | { | |
4753 | dispose_variable (var); /* XXX */ | |
4754 | var = (SHELL_VAR *)NULL; | |
4755 | } | |
4756 | goto return0; | |
4757 | } | |
4758 | ||
4759 | temp = (char *)NULL; | |
4760 | ||
4761 | if (unbound_vars_is_error) | |
4762 | report_error ("%s: unbound variable", temp1); | |
4763 | else | |
4764 | { | |
4765 | free (temp1); | |
4766 | goto return0; | |
4767 | } | |
4768 | ||
4769 | free (temp1); | |
4770 | last_command_exit_value = EXECUTION_FAILURE; | |
4771 | return ((unbound_vars_is_error && interactive_shell == 0) | |
4772 | ? &expand_param_fatal | |
4773 | : &expand_param_error); | |
4774 | } | |
4775 | ||
4776 | if (string[zindex]) | |
4777 | zindex++; | |
4778 | ||
4779 | return0: | |
4780 | *sindex = zindex; | |
4781 | return (temp); | |
4782 | } | |
4783 | ||
4784 | /* Make a word list which is the result of parameter and variable | |
4785 | expansion, command substitution, arithmetic substitution, and | |
4786 | quote removal of WORD. Return a pointer to a WORD_LIST which is | |
4787 | the result of the expansion. If WORD contains a null word, the | |
4788 | word list returned is also null. | |
726f6388 | 4789 | |
ccc6cda3 JA |
4790 | QUOTED contains flag values defined in shell.h. |
4791 | ||
b72432fd JA |
4792 | ISEXP is used to tell expand_word_internal that the word should be |
4793 | treated as the result of an expansion. This has implications for | |
4794 | how IFS characters in the word are treated. | |
4795 | ||
726f6388 JA |
4796 | CONTAINS_DOLLAR_AT and EXPANDED_SOMETHING are return values; when non-null |
4797 | they point to an integer value which receives information about expansion. | |
4798 | CONTAINS_DOLLAR_AT gets non-zero if WORD contained "$@", else zero. | |
4799 | EXPANDED_SOMETHING get non-zero if WORD contained any parameter expansions, | |
4800 | else zero. | |
4801 | ||
4802 | This only does word splitting in the case of $@ expansion. In that | |
4803 | case, we split on ' '. */ | |
4804 | ||
4805 | /* Values for the local variable quoted_state. */ | |
4806 | #define UNQUOTED 0 | |
4807 | #define PARTIALLY_QUOTED 1 | |
4808 | #define WHOLLY_QUOTED 2 | |
4809 | ||
4810 | static WORD_LIST * | |
b72432fd | 4811 | expand_word_internal (word, quoted, isexp, contains_dollar_at, expanded_something) |
726f6388 | 4812 | WORD_DESC *word; |
b72432fd | 4813 | int quoted, isexp; |
726f6388 JA |
4814 | int *contains_dollar_at; |
4815 | int *expanded_something; | |
4816 | { | |
ccc6cda3 JA |
4817 | WORD_LIST *list; |
4818 | WORD_DESC *tword; | |
4819 | SHELL_VAR *var; | |
726f6388 JA |
4820 | |
4821 | /* The intermediate string that we build while expanding. */ | |
ccc6cda3 | 4822 | char *istring; |
726f6388 JA |
4823 | |
4824 | /* The current size of the above object. */ | |
ccc6cda3 | 4825 | int istring_size; |
726f6388 JA |
4826 | |
4827 | /* Index into ISTRING. */ | |
ccc6cda3 | 4828 | int istring_index; |
726f6388 JA |
4829 | |
4830 | /* Temporary string storage. */ | |
ccc6cda3 | 4831 | char *temp, *temp1; |
726f6388 JA |
4832 | |
4833 | /* The text of WORD. */ | |
ccc6cda3 | 4834 | register char *string; |
726f6388 JA |
4835 | |
4836 | /* The index into STRING. */ | |
ccc6cda3 | 4837 | int sindex; |
726f6388 JA |
4838 | |
4839 | /* This gets 1 if we see a $@ while quoted. */ | |
ccc6cda3 | 4840 | int quoted_dollar_at; |
726f6388 JA |
4841 | |
4842 | /* One of UNQUOTED, PARTIALLY_QUOTED, or WHOLLY_QUOTED, depending on | |
4843 | whether WORD contains no quoting characters, a partially quoted | |
4844 | string (e.g., "xx"ab), or is fully quoted (e.g., "xxab"). */ | |
ccc6cda3 JA |
4845 | int quoted_state; |
4846 | ||
4847 | int had_quoted_null; | |
cce855bc | 4848 | int has_dollar_at; |
726f6388 JA |
4849 | |
4850 | register int c; /* Current character. */ | |
4851 | int number; /* Temporary number value. */ | |
4852 | int t_index; /* For calls to string_extract_xxx. */ | |
726f6388 | 4853 | |
b72432fd JA |
4854 | char ifscmap[256]; |
4855 | ||
d166f048 | 4856 | istring = xmalloc (istring_size = DEFAULT_INITIAL_ARRAY_SIZE); |
ccc6cda3 | 4857 | istring[istring_index = 0] = '\0'; |
cce855bc | 4858 | quoted_dollar_at = had_quoted_null = has_dollar_at = 0; |
ccc6cda3 JA |
4859 | quoted_state = UNQUOTED; |
4860 | ||
4861 | string = word->word; | |
4862 | if (string == 0) | |
4863 | goto finished_with_string; | |
726f6388 JA |
4864 | |
4865 | if (contains_dollar_at) | |
4866 | *contains_dollar_at = 0; | |
4867 | ||
b72432fd JA |
4868 | /* Cache a bitmap of characters in IFS for quoting IFS characters that are |
4869 | not part of an expansion. POSIX.2 says this is a must. */ | |
4870 | temp = getifs (); | |
4871 | bzero (ifscmap, sizeof (ifscmap)); | |
4872 | for (temp1 = temp; temp1 && *temp1; temp1++) | |
4873 | #if 0 | |
4874 | /* This check compensates for what I think is a parsing problem -- the | |
4875 | end brace matching algorithms for ${...} expressions differ between | |
4876 | parse.y and subst.c. For instance, the parser passes | |
4877 | ${abc:-G { I } K } as one word when it should be three. */ | |
4878 | if (*temp1 != ' ' && *temp1 != '\t' && *temp1 != '\n') | |
4879 | #endif | |
4880 | ifscmap[*temp1] = 1; | |
4881 | ||
726f6388 JA |
4882 | /* Begin the expansion. */ |
4883 | ||
ccc6cda3 | 4884 | for (sindex = 0; ;) |
726f6388 JA |
4885 | { |
4886 | c = string[sindex]; | |
4887 | ||
4888 | /* Case on toplevel character. */ | |
4889 | switch (c) | |
4890 | { | |
4891 | case '\0': | |
4892 | goto finished_with_string; | |
4893 | ||
4894 | case CTLESC: | |
4895 | temp = xmalloc (3); | |
4896 | temp[0] = CTLESC; | |
4897 | temp[1] = c = string[++sindex]; | |
4898 | temp[2] = '\0'; | |
4899 | ||
cce855bc | 4900 | dollar_add_string: |
726f6388 JA |
4901 | if (string[sindex]) |
4902 | sindex++; | |
4903 | ||
cce855bc JA |
4904 | add_string: |
4905 | if (temp) | |
4906 | { | |
4907 | istring = sub_append_string (temp, istring, &istring_index, &istring_size); | |
4908 | temp = (char *)0; | |
4909 | } | |
4910 | ||
4911 | break; | |
726f6388 JA |
4912 | |
4913 | #if defined (PROCESS_SUBSTITUTION) | |
4914 | /* Process substitution. */ | |
4915 | case '<': | |
4916 | case '>': | |
4917 | { | |
cce855bc | 4918 | if (string[++sindex] != LPAREN || (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || posixly_correct) |
726f6388 JA |
4919 | { |
4920 | sindex--; | |
4921 | goto add_character; | |
4922 | } | |
4923 | else | |
cce855bc | 4924 | t_index = sindex + 1; /* skip past both '<' and LPAREN */ |
726f6388 | 4925 | |
cce855bc | 4926 | temp1 = extract_process_subst (string, (c == '<') ? "<(" : ">(", &t_index); /*))*/ |
ccc6cda3 | 4927 | sindex = t_index; |
726f6388 JA |
4928 | |
4929 | /* If the process substitution specification is `<()', we want to | |
4930 | open the pipe for writing in the child and produce output; if | |
4931 | it is `>()', we want to open the pipe for reading in the child | |
4932 | and consume input. */ | |
ccc6cda3 | 4933 | temp = temp1 ? process_substitute (temp1, (c == '>')) : (char *)0; |
726f6388 JA |
4934 | |
4935 | FREE (temp1); | |
4936 | ||
4937 | goto dollar_add_string; | |
4938 | } | |
4939 | #endif /* PROCESS_SUBSTITUTION */ | |
4940 | ||
726f6388 | 4941 | case '$': |
726f6388 JA |
4942 | if (expanded_something) |
4943 | *expanded_something = 1; | |
4944 | ||
cce855bc JA |
4945 | has_dollar_at = 0; |
4946 | temp = param_expand (string, &sindex, quoted, expanded_something, | |
4947 | &has_dollar_at, "ed_dollar_at, | |
4948 | &had_quoted_null, 0); | |
726f6388 | 4949 | |
cce855bc | 4950 | if (temp == &expand_param_error || temp == &expand_param_fatal) |
726f6388 | 4951 | { |
cce855bc JA |
4952 | free (string); |
4953 | free (istring); | |
4954 | return ((temp == &expand_param_error) ? &expand_word_error | |
4955 | : &expand_word_fatal); | |
4956 | } | |
4957 | if (contains_dollar_at && has_dollar_at) | |
4958 | *contains_dollar_at = 1; | |
4959 | goto add_string; | |
4960 | break; | |
726f6388 | 4961 | |
cce855bc JA |
4962 | case '`': /* Backquoted command substitution. */ |
4963 | { | |
4964 | sindex++; | |
726f6388 | 4965 | |
cce855bc JA |
4966 | if (expanded_something) |
4967 | *expanded_something = 1; | |
726f6388 | 4968 | |
cce855bc JA |
4969 | temp = string_extract (string, &sindex, "`", 0); |
4970 | de_backslash (temp); | |
4971 | temp1 = command_substitute (temp, quoted); | |
4972 | FREE (temp); | |
4973 | temp = temp1; | |
4974 | goto dollar_add_string; | |
4975 | } | |
ccc6cda3 | 4976 | |
cce855bc JA |
4977 | case '\\': |
4978 | if (string[sindex + 1] == '\n') | |
4979 | { | |
4980 | sindex += 2; | |
4981 | continue; | |
4982 | } | |
726f6388 | 4983 | |
cce855bc | 4984 | c = string[++sindex]; |
726f6388 | 4985 | |
cce855bc JA |
4986 | if (quoted & Q_HERE_DOCUMENT) |
4987 | temp1 = slashify_in_here_document; | |
4988 | else if (quoted & Q_DOUBLE_QUOTES) | |
4989 | temp1 = slashify_in_quotes; | |
4990 | else | |
4991 | temp1 = ""; | |
726f6388 | 4992 | |
cce855bc JA |
4993 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) && member (c, temp1) == 0) |
4994 | { | |
4995 | temp = xmalloc (3); | |
4996 | temp[0] = '\\'; temp[1] = c; temp[2] = '\0'; | |
4997 | } | |
4998 | else | |
4999 | /* This character is quoted, so add it in quoted mode. */ | |
5000 | temp = make_quoted_char (c); | |
726f6388 | 5001 | |
cce855bc JA |
5002 | if (c) |
5003 | sindex++; | |
5004 | goto add_string; | |
726f6388 | 5005 | |
cce855bc JA |
5006 | case '"': |
5007 | if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT|Q_NOQUOTE)) | |
5008 | goto add_character; | |
ccc6cda3 JA |
5009 | |
5010 | t_index = ++sindex; | |
5011 | temp = string_extract_double_quoted (string, &sindex, 0); | |
5012 | ||
5013 | /* If the quotes surrounded the entire string, then the | |
5014 | whole word was quoted. */ | |
5015 | quoted_state = (t_index == 1 && string[sindex] == '\0') | |
5016 | ? WHOLLY_QUOTED | |
5017 | : PARTIALLY_QUOTED; | |
5018 | ||
5019 | if (temp && *temp) | |
726f6388 | 5020 | { |
ccc6cda3 JA |
5021 | tword = make_word (temp); /* XXX */ |
5022 | free (temp); | |
5023 | temp = (char *)NULL; | |
5024 | ||
cce855bc | 5025 | has_dollar_at = 0; |
b72432fd | 5026 | list = expand_word_internal (tword, Q_DOUBLE_QUOTES, 0, &has_dollar_at, (int *)NULL); |
726f6388 | 5027 | |
ccc6cda3 JA |
5028 | if (list == &expand_word_error || list == &expand_word_fatal) |
5029 | { | |
5030 | free (istring); | |
5031 | free (string); | |
5032 | /* expand_word_internal has already freed temp_word->word | |
5033 | for us because of the way it prints error messages. */ | |
5034 | tword->word = (char *)NULL; | |
5035 | dispose_word (tword); | |
5036 | return list; | |
5037 | } | |
726f6388 | 5038 | |
ccc6cda3 | 5039 | dispose_word (tword); |
726f6388 | 5040 | |
ccc6cda3 JA |
5041 | /* "$@" (a double-quoted dollar-at) expands into nothing, |
5042 | not even a NULL word, when there are no positional | |
5043 | parameters. */ | |
cce855bc | 5044 | if (list == 0 && has_dollar_at) |
726f6388 | 5045 | { |
ccc6cda3 JA |
5046 | quoted_dollar_at++; |
5047 | break; | |
5048 | } | |
5049 | ||
5050 | /* If we get "$@", we know we have expanded something, so we | |
5051 | need to remember it for the final split on $IFS. This is | |
5052 | a special case; it's the only case where a quoted string | |
5053 | can expand into more than one word. It's going to come back | |
5054 | from the above call to expand_word_internal as a list with | |
5055 | a single word, in which all characters are quoted and | |
5056 | separated by blanks. What we want to do is to turn it back | |
5057 | into a list for the next piece of code. */ | |
5058 | if (list) | |
5059 | dequote_list (list); | |
5060 | ||
cce855bc | 5061 | if (has_dollar_at) |
ccc6cda3 JA |
5062 | { |
5063 | quoted_dollar_at++; | |
5064 | if (contains_dollar_at) | |
5065 | *contains_dollar_at = 1; | |
5066 | if (expanded_something) | |
5067 | *expanded_something = 1; | |
5068 | } | |
5069 | } | |
5070 | else | |
5071 | { | |
5072 | /* What we have is "". This is a minor optimization. */ | |
5073 | free (temp); | |
5074 | list = (WORD_LIST *)NULL; | |
5075 | } | |
5076 | ||
5077 | /* The code above *might* return a list (consider the case of "$@", | |
5078 | where it returns "$1", "$2", etc.). We can't throw away the | |
5079 | rest of the list, and we have to make sure each word gets added | |
5080 | as quoted. We test on tresult->next: if it is non-NULL, we | |
5081 | quote the whole list, save it to a string with string_list, and | |
5082 | add that string. We don't need to quote the results of this | |
5083 | (and it would be wrong, since that would quote the separators | |
5084 | as well), so we go directly to add_string. */ | |
5085 | if (list) | |
5086 | { | |
5087 | if (list->next) | |
5088 | { | |
bc4cd23c JA |
5089 | /* Testing quoted_dollar_at makes sure that "$@" is |
5090 | split correctly when $IFS does not contain a space. */ | |
5091 | temp = quoted_dollar_at | |
5092 | ? string_list_dollar_at (list, Q_DOUBLE_QUOTES) | |
5093 | : string_list (quote_list (list)); | |
ccc6cda3 | 5094 | dispose_words (list); |
726f6388 JA |
5095 | goto add_string; |
5096 | } | |
5097 | else | |
5098 | { | |
ccc6cda3 JA |
5099 | temp = savestring (list->word->word); |
5100 | dispose_words (list); | |
cce855bc JA |
5101 | #if 1 |
5102 | /* If the string is not a quoted null string, we want | |
5103 | to remove any embedded unquoted CTLNUL characters. | |
5104 | We do not want to turn quoted null strings back into | |
5105 | the empty string, though. We do this because we | |
5106 | want to remove any quoted nulls from expansions that | |
5107 | contain other characters. For example, if we have | |
5108 | x"$*"y or "x$*y" and there are no positional parameters, | |
5109 | the $* should expand into nothing. */ | |
5110 | if (QUOTED_NULL (temp) == 0) | |
5111 | remove_quoted_nulls (temp); /* XXX */ | |
5112 | #endif | |
726f6388 JA |
5113 | } |
5114 | } | |
ccc6cda3 JA |
5115 | else |
5116 | temp = (char *)NULL; | |
726f6388 | 5117 | |
ccc6cda3 JA |
5118 | /* We do not want to add quoted nulls to strings that are only |
5119 | partially quoted; we can throw them away. */ | |
5120 | if (temp == 0 && quoted_state == PARTIALLY_QUOTED) | |
cce855bc | 5121 | continue; |
726f6388 | 5122 | |
ccc6cda3 | 5123 | add_quoted_string: |
726f6388 | 5124 | |
ccc6cda3 JA |
5125 | if (temp) |
5126 | { | |
5127 | temp1 = temp; | |
5128 | temp = quote_string (temp); | |
5129 | free (temp1); | |
5130 | } | |
5131 | else | |
5132 | { | |
5133 | /* Add NULL arg. */ | |
5134 | temp = xmalloc (2); | |
5135 | temp[0] = CTLNUL; | |
5136 | temp[1] = '\0'; | |
5137 | } | |
5138 | goto add_string; | |
5139 | /* break; */ | |
726f6388 | 5140 | |
ccc6cda3 JA |
5141 | case '\'': |
5142 | if (quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT|Q_NOQUOTE)) | |
5143 | goto add_character; | |
726f6388 | 5144 | |
ccc6cda3 JA |
5145 | t_index = ++sindex; |
5146 | temp = string_extract_single_quoted (string, &sindex); | |
726f6388 | 5147 | |
ccc6cda3 JA |
5148 | /* If the entire STRING was surrounded by single quotes, |
5149 | then the string is wholly quoted. */ | |
5150 | quoted_state = (t_index == 1 && string[sindex] == '\0') | |
5151 | ? WHOLLY_QUOTED | |
5152 | : PARTIALLY_QUOTED; | |
726f6388 | 5153 | |
ccc6cda3 JA |
5154 | /* If all we had was '', it is a null expansion. */ |
5155 | if (*temp == '\0') | |
5156 | { | |
5157 | free (temp); | |
5158 | temp = (char *)NULL; | |
5159 | } | |
5160 | else | |
5161 | remove_quoted_escapes (temp); | |
726f6388 | 5162 | |
ccc6cda3 JA |
5163 | /* We do not want to add quoted nulls to strings that are only |
5164 | partially quoted; such nulls are discarded. */ | |
5165 | if (temp == 0 && (quoted_state == PARTIALLY_QUOTED)) | |
5166 | continue; | |
726f6388 | 5167 | |
ccc6cda3 JA |
5168 | goto add_quoted_string; |
5169 | /* break; */ | |
726f6388 JA |
5170 | |
5171 | default: | |
726f6388 | 5172 | /* This is the fix for " $@ " */ |
b72432fd | 5173 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || (isexp == 0 && ifscmap[c])) |
726f6388 JA |
5174 | { |
5175 | temp = make_quoted_char (c); | |
ccc6cda3 | 5176 | goto dollar_add_string; |
726f6388 JA |
5177 | } |
5178 | ||
5179 | add_character: | |
ccc6cda3 JA |
5180 | RESIZE_MALLOCED_BUFFER (istring, istring_index, 1, istring_size, |
5181 | DEFAULT_ARRAY_SIZE); | |
726f6388 JA |
5182 | istring[istring_index++] = c; |
5183 | istring[istring_index] = '\0'; | |
5184 | ||
5185 | /* Next character. */ | |
5186 | sindex++; | |
5187 | } | |
5188 | } | |
5189 | ||
5190 | finished_with_string: | |
726f6388 JA |
5191 | /* OK, we're ready to return. If we have a quoted string, and |
5192 | quoted_dollar_at is not set, we do no splitting at all; otherwise | |
5193 | we split on ' '. The routines that call this will handle what to | |
5194 | do if nothing has been expanded. */ | |
ccc6cda3 JA |
5195 | |
5196 | /* Partially and wholly quoted strings which expand to the empty | |
5197 | string are retained as an empty arguments. Unquoted strings | |
5198 | which expand to the empty string are discarded. The single | |
5199 | exception is the case of expanding "$@" when there are no | |
5200 | positional parameters. In that case, we discard the expansion. */ | |
5201 | ||
5202 | /* Because of how the code that handles "" and '' in partially | |
5203 | quoted strings works, we need to make ISTRING into a QUOTED_NULL | |
5204 | if we saw quoting characters, but the expansion was empty. | |
5205 | "" and '' are tossed away before we get to this point when | |
5206 | processing partially quoted strings. This makes "" and $xxx"" | |
5207 | equivalent when xxx is unset. We also look to see whether we | |
5208 | saw a quoted null from a ${} expansion and add one back if we | |
5209 | need to. */ | |
5210 | ||
5211 | /* If we expand to nothing and there were no single or double quotes | |
5212 | in the word, we throw it away. Otherwise, we return a NULL word. | |
5213 | The single exception is for $@ surrounded by double quotes when | |
5214 | there are no positional parameters. In that case, we also throw | |
5215 | the word away. */ | |
5216 | ||
5217 | if (*istring == '\0') | |
5218 | { | |
5219 | if (quoted_dollar_at == 0 && (had_quoted_null || quoted_state == PARTIALLY_QUOTED)) | |
726f6388 | 5220 | { |
726f6388 JA |
5221 | istring[0] = CTLNUL; |
5222 | istring[1] = '\0'; | |
ccc6cda3 JA |
5223 | tword = make_bare_word (istring); |
5224 | list = make_word_list (tword, (WORD_LIST *)NULL); | |
5225 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
5226 | tword->flags |= W_QUOTED; | |
726f6388 | 5227 | } |
ccc6cda3 JA |
5228 | /* According to sh, ksh, and Posix.2, if a word expands into nothing |
5229 | and a double-quoted "$@" appears anywhere in it, then the entire | |
5230 | word is removed. */ | |
5231 | else if (quoted_state == UNQUOTED || quoted_dollar_at) | |
5232 | list = (WORD_LIST *)NULL; | |
5233 | #if 0 | |
5234 | else | |
726f6388 | 5235 | { |
ccc6cda3 JA |
5236 | tword = make_bare_word (istring); |
5237 | list = make_word_list (tword, (WORD_LIST *)NULL); | |
5238 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) | |
5239 | tword->flags |= W_QUOTED; | |
726f6388 | 5240 | } |
ccc6cda3 JA |
5241 | #endif |
5242 | } | |
5243 | else if (word->flags & W_NOSPLIT) | |
5244 | { | |
5245 | tword = make_bare_word (istring); | |
5246 | list = make_word_list (tword, (WORD_LIST *)NULL); | |
5247 | if (word->flags & W_ASSIGNMENT) | |
5248 | tword->flags |= W_ASSIGNMENT; /* XXX */ | |
b72432fd JA |
5249 | if (word->flags & W_NOGLOB) |
5250 | tword->flags |= W_NOGLOB; /* XXX */ | |
ccc6cda3 JA |
5251 | if (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) |
5252 | tword->flags |= W_QUOTED; | |
5253 | } | |
5254 | else | |
5255 | { | |
5256 | char *ifs_chars; | |
5257 | ||
b72432fd | 5258 | ifs_chars = (quoted_dollar_at || has_dollar_at) ? getifs () : (char *)NULL; |
726f6388 | 5259 | |
cce855bc JA |
5260 | /* If we have $@, we need to split the results no matter what. If |
5261 | IFS is unset or NULL, string_list_dollar_at has separated the | |
5262 | positional parameters with a space, so we split on space (we have | |
5263 | set ifs_chars to " \t\n" above if ifs is unset). If IFS is set, | |
5264 | string_list_dollar_at has separated the positional parameters | |
5265 | with the first character of $IFS, so we split on $IFS. */ | |
5266 | if (has_dollar_at && ifs_chars) | |
5267 | list = list_string (istring, *ifs_chars ? ifs_chars : " ", 1); | |
ccc6cda3 JA |
5268 | else |
5269 | { | |
5270 | tword = make_bare_word (istring); | |
5271 | list = make_word_list (tword, (WORD_LIST *)NULL); | |
5272 | if ((quoted & (Q_DOUBLE_QUOTES|Q_HERE_DOCUMENT)) || (quoted_state == WHOLLY_QUOTED)) | |
5273 | tword->flags |= W_QUOTED; | |
5274 | if (word->flags & W_ASSIGNMENT) | |
5275 | tword->flags |= W_ASSIGNMENT; | |
b72432fd JA |
5276 | if (word->flags & W_NOGLOB) |
5277 | tword->flags |= W_NOGLOB; | |
726f6388 | 5278 | } |
726f6388 | 5279 | } |
726f6388 | 5280 | |
ccc6cda3 JA |
5281 | free (istring); |
5282 | return (list); | |
726f6388 JA |
5283 | } |
5284 | ||
5285 | /* **************************************************************** */ | |
5286 | /* */ | |
5287 | /* Functions for Quote Removal */ | |
5288 | /* */ | |
5289 | /* **************************************************************** */ | |
5290 | ||
5291 | /* Perform quote removal on STRING. If QUOTED > 0, assume we are obeying the | |
5292 | backslash quoting rules for within double quotes. */ | |
5293 | char * | |
5294 | string_quote_removal (string, quoted) | |
5295 | char *string; | |
5296 | int quoted; | |
5297 | { | |
ccc6cda3 | 5298 | char *r, *result_string, *temp; |
726f6388 JA |
5299 | int sindex, tindex, c, dquote; |
5300 | ||
5301 | /* The result can be no longer than the original string. */ | |
5302 | r = result_string = xmalloc (strlen (string) + 1); | |
5303 | ||
ccc6cda3 | 5304 | for (dquote = sindex = 0; c = string[sindex];) |
726f6388 JA |
5305 | { |
5306 | switch (c) | |
5307 | { | |
5308 | case '\\': | |
5309 | c = string[++sindex]; | |
ccc6cda3 | 5310 | if (((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || dquote) && member (c, slashify_in_quotes) == 0) |
726f6388 | 5311 | *r++ = '\\'; |
ccc6cda3 | 5312 | /* FALLTHROUGH */ |
726f6388 JA |
5313 | |
5314 | default: | |
5315 | *r++ = c; | |
5316 | sindex++; | |
5317 | break; | |
5318 | ||
5319 | case '\'': | |
ccc6cda3 | 5320 | if ((quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES)) || dquote) |
726f6388 JA |
5321 | { |
5322 | *r++ = c; | |
5323 | sindex++; | |
ccc6cda3 | 5324 | break; |
726f6388 | 5325 | } |
ccc6cda3 JA |
5326 | tindex = sindex + 1; |
5327 | temp = string_extract_single_quoted (string, &tindex); | |
5328 | if (temp) | |
726f6388 | 5329 | { |
ccc6cda3 JA |
5330 | strcpy (r, temp); |
5331 | r += strlen (r); | |
5332 | free (temp); | |
726f6388 | 5333 | } |
ccc6cda3 | 5334 | sindex = tindex; |
726f6388 JA |
5335 | break; |
5336 | ||
5337 | case '"': | |
5338 | dquote = 1 - dquote; | |
5339 | sindex++; | |
5340 | break; | |
5341 | } | |
5342 | } | |
5343 | *r = '\0'; | |
5344 | return (result_string); | |
5345 | } | |
5346 | ||
ccc6cda3 JA |
5347 | #if 0 |
5348 | /* UNUSED */ | |
726f6388 JA |
5349 | /* Perform quote removal on word WORD. This allocates and returns a new |
5350 | WORD_DESC *. */ | |
5351 | WORD_DESC * | |
5352 | word_quote_removal (word, quoted) | |
5353 | WORD_DESC *word; | |
5354 | int quoted; | |
5355 | { | |
5356 | WORD_DESC *w; | |
5357 | char *t; | |
5358 | ||
5359 | t = string_quote_removal (word->word, quoted); | |
ccc6cda3 | 5360 | w = make_bare_word (t); |
d166f048 | 5361 | free (t); |
726f6388 JA |
5362 | return (w); |
5363 | } | |
5364 | ||
5365 | /* Perform quote removal on all words in LIST. If QUOTED is non-zero, | |
5366 | the members of the list are treated as if they are surrounded by | |
5367 | double quotes. Return a new list, or NULL if LIST is NULL. */ | |
5368 | WORD_LIST * | |
5369 | word_list_quote_removal (list, quoted) | |
5370 | WORD_LIST *list; | |
5371 | int quoted; | |
5372 | { | |
ccc6cda3 | 5373 | WORD_LIST *result, *t, *tresult; |
726f6388 | 5374 | |
ccc6cda3 | 5375 | for (t = list, result = (WORD_LIST *)NULL; t; t = t->next) |
726f6388 JA |
5376 | { |
5377 | tresult = (WORD_LIST *)xmalloc (sizeof (WORD_LIST)); | |
5378 | tresult->word = word_quote_removal (t->word, quoted); | |
5379 | tresult->next = (WORD_LIST *)NULL; | |
5380 | result = (WORD_LIST *) list_append (result, tresult); | |
726f6388 JA |
5381 | } |
5382 | return (result); | |
5383 | } | |
ccc6cda3 | 5384 | #endif |
726f6388 | 5385 | |
726f6388 JA |
5386 | /******************************************* |
5387 | * * | |
5388 | * Functions to perform word splitting * | |
5389 | * * | |
5390 | *******************************************/ | |
5391 | ||
b72432fd JA |
5392 | static char * |
5393 | getifs () | |
5394 | { | |
5395 | SHELL_VAR *ifs; | |
5396 | ||
5397 | ifs = find_variable ("IFS"); | |
5398 | /* If IFS is unset, it defaults to " \t\n". */ | |
5399 | return (ifs ? value_cell (ifs) : " \t\n"); | |
5400 | } | |
5401 | ||
726f6388 JA |
5402 | /* This splits a single word into a WORD LIST on $IFS, but only if the word |
5403 | is not quoted. list_string () performs quote removal for us, even if we | |
5404 | don't do any splitting. */ | |
5405 | WORD_LIST * | |
5406 | word_split (w) | |
5407 | WORD_DESC *w; | |
5408 | { | |
5409 | WORD_LIST *result; | |
ccc6cda3 JA |
5410 | SHELL_VAR *ifs; |
5411 | char *ifs_chars; | |
726f6388 JA |
5412 | |
5413 | if (w) | |
5414 | { | |
ccc6cda3 | 5415 | ifs = find_variable ("IFS"); |
726f6388 | 5416 | /* If IFS is unset, it defaults to " \t\n". */ |
ccc6cda3 | 5417 | ifs_chars = ifs ? value_cell (ifs) : " \t\n"; |
726f6388 | 5418 | |
ccc6cda3 | 5419 | if ((w->flags & W_QUOTED) || !ifs_chars) |
726f6388 JA |
5420 | ifs_chars = ""; |
5421 | ||
ccc6cda3 | 5422 | result = list_string (w->word, ifs_chars, w->flags & W_QUOTED); |
cce855bc JA |
5423 | |
5424 | if (ifs && tempvar_p (ifs)) /* XXX */ | |
5425 | dispose_variable (ifs); /* XXX */ | |
726f6388 JA |
5426 | } |
5427 | else | |
5428 | result = (WORD_LIST *)NULL; | |
ccc6cda3 | 5429 | |
726f6388 JA |
5430 | return (result); |
5431 | } | |
5432 | ||
5433 | /* Perform word splitting on LIST and return the RESULT. It is possible | |
5434 | to return (WORD_LIST *)NULL. */ | |
5435 | static WORD_LIST * | |
5436 | word_list_split (list) | |
5437 | WORD_LIST *list; | |
5438 | { | |
ccc6cda3 | 5439 | WORD_LIST *result, *t, *tresult; |
726f6388 | 5440 | |
ccc6cda3 | 5441 | for (t = list, result = (WORD_LIST *)NULL; t; t = t->next) |
726f6388 JA |
5442 | { |
5443 | tresult = word_split (t->word); | |
5444 | result = (WORD_LIST *) list_append (result, tresult); | |
726f6388 JA |
5445 | } |
5446 | return (result); | |
5447 | } | |
5448 | ||
5449 | /************************************************** | |
5450 | * * | |
cce855bc | 5451 | * Functions to expand an entire WORD_LIST * |
726f6388 JA |
5452 | * * |
5453 | **************************************************/ | |
5454 | ||
cce855bc JA |
5455 | /* Put NLIST (which is a WORD_LIST * of only one element) at the front of |
5456 | ELIST, and set ELIST to the new list. */ | |
5457 | #define PREPEND_LIST(nlist, elist) \ | |
5458 | do { nlist->next = elist; elist = nlist; } while (0) | |
5459 | ||
726f6388 JA |
5460 | static WORD_LIST *varlist = (WORD_LIST *)NULL; |
5461 | ||
5462 | /* Separate out any initial variable assignments from TLIST. If set -k has | |
5463 | been executed, remove all assignment statements from TLIST. Initial | |
5464 | variable assignments and other environment assignments are placed | |
5465 | on VARLIST. */ | |
5466 | static WORD_LIST * | |
5467 | separate_out_assignments (tlist) | |
5468 | WORD_LIST *tlist; | |
5469 | { | |
5470 | register WORD_LIST *vp, *lp; | |
5471 | ||
5472 | if (!tlist) | |
5473 | return ((WORD_LIST *)NULL); | |
5474 | ||
b72432fd JA |
5475 | if (varlist) |
5476 | dispose_words (varlist); /* Clean up after previous error */ | |
5477 | ||
726f6388 JA |
5478 | varlist = (WORD_LIST *)NULL; |
5479 | vp = lp = tlist; | |
5480 | ||
5481 | /* Separate out variable assignments at the start of the command. | |
5482 | Loop invariant: vp->next == lp | |
5483 | Loop postcondition: | |
5484 | lp = list of words left after assignment statements skipped | |
5485 | tlist = original list of words | |
5486 | */ | |
ccc6cda3 | 5487 | while (lp && (lp->word->flags & W_ASSIGNMENT)) |
726f6388 JA |
5488 | { |
5489 | vp = lp; | |
5490 | lp = lp->next; | |
5491 | } | |
5492 | ||
5493 | /* If lp != tlist, we have some initial assignment statements. */ | |
5494 | /* We make VARLIST point to the list of assignment words and | |
5495 | TLIST point to the remaining words. */ | |
5496 | if (lp != tlist) | |
5497 | { | |
5498 | varlist = tlist; | |
5499 | /* ASSERT(vp->next == lp); */ | |
5500 | vp->next = (WORD_LIST *)NULL; /* terminate variable list */ | |
5501 | tlist = lp; /* remainder of word list */ | |
5502 | } | |
5503 | ||
5504 | /* vp == end of variable list */ | |
5505 | /* tlist == remainder of original word list without variable assignments */ | |
5506 | if (!tlist) | |
5507 | /* All the words in tlist were assignment statements */ | |
5508 | return ((WORD_LIST *)NULL); | |
5509 | ||
5510 | /* ASSERT(tlist != NULL); */ | |
ccc6cda3 | 5511 | /* ASSERT((tlist->word->flags & W_ASSIGNMENT) == 0); */ |
726f6388 JA |
5512 | |
5513 | /* If the -k option is in effect, we need to go through the remaining | |
5514 | words, separate out the assignment words, and place them on VARLIST. */ | |
5515 | if (place_keywords_in_env) | |
5516 | { | |
5517 | WORD_LIST *tp; /* tp == running pointer into tlist */ | |
5518 | ||
5519 | tp = tlist; | |
5520 | lp = tlist->next; | |
5521 | ||
5522 | /* Loop Invariant: tp->next == lp */ | |
5523 | /* Loop postcondition: tlist == word list without assignment statements */ | |
5524 | while (lp) | |
5525 | { | |
ccc6cda3 | 5526 | if (lp->word->flags & W_ASSIGNMENT) |
726f6388 JA |
5527 | { |
5528 | /* Found an assignment statement, add this word to end of | |
5529 | varlist (vp). */ | |
5530 | if (!varlist) | |
5531 | varlist = vp = lp; | |
5532 | else | |
5533 | { | |
5534 | vp->next = lp; | |
5535 | vp = lp; | |
5536 | } | |
5537 | ||
5538 | /* Remove the word pointed to by LP from TLIST. */ | |
5539 | tp->next = lp->next; | |
5540 | /* ASSERT(vp == lp); */ | |
5541 | lp->next = (WORD_LIST *)NULL; | |
5542 | lp = tp->next; | |
5543 | } | |
5544 | else | |
5545 | { | |
5546 | tp = lp; | |
5547 | lp = lp->next; | |
5548 | } | |
5549 | } | |
5550 | } | |
5551 | return (tlist); | |
5552 | } | |
5553 | ||
cce855bc JA |
5554 | #define WEXP_VARASSIGN 0x001 |
5555 | #define WEXP_BRACEEXP 0x002 | |
5556 | #define WEXP_TILDEEXP 0x004 | |
5557 | #define WEXP_PARAMEXP 0x008 | |
5558 | #define WEXP_PATHEXP 0x010 | |
5559 | ||
5560 | /* All of the expansions, including variable assignments at the start of | |
5561 | the list. */ | |
5562 | #define WEXP_ALL (WEXP_VARASSIGN|WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP|WEXP_PATHEXP) | |
5563 | ||
5564 | /* All of the expansions except variable assignments at the start of | |
5565 | the list. */ | |
5566 | #define WEXP_NOVARS (WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP|WEXP_PATHEXP) | |
5567 | ||
5568 | /* All of the `shell expansions': brace expansion, tilde expansion, parameter | |
5569 | expansion, command substitution, arithmetic expansion, word splitting, and | |
5570 | quote removal. */ | |
5571 | #define WEXP_SHELLEXP (WEXP_BRACEEXP|WEXP_TILDEEXP|WEXP_PARAMEXP) | |
5572 | ||
726f6388 JA |
5573 | /* Take the list of words in LIST and do the various substitutions. Return |
5574 | a new list of words which is the expanded list, and without things like | |
5575 | variable assignments. */ | |
5576 | ||
5577 | WORD_LIST * | |
5578 | expand_words (list) | |
5579 | WORD_LIST *list; | |
5580 | { | |
cce855bc | 5581 | return (expand_word_list_internal (list, WEXP_ALL)); |
726f6388 JA |
5582 | } |
5583 | ||
5584 | /* Same as expand_words (), but doesn't hack variable or environment | |
5585 | variables. */ | |
5586 | WORD_LIST * | |
5587 | expand_words_no_vars (list) | |
5588 | WORD_LIST *list; | |
5589 | { | |
cce855bc | 5590 | return (expand_word_list_internal (list, WEXP_NOVARS)); |
726f6388 JA |
5591 | } |
5592 | ||
cce855bc JA |
5593 | WORD_LIST * |
5594 | expand_words_shellexp (list) | |
726f6388 | 5595 | WORD_LIST *list; |
726f6388 | 5596 | { |
cce855bc JA |
5597 | return (expand_word_list_internal (list, WEXP_SHELLEXP)); |
5598 | } | |
726f6388 | 5599 | |
cce855bc JA |
5600 | static WORD_LIST * |
5601 | glob_expand_word_list (tlist, eflags) | |
5602 | WORD_LIST *tlist; | |
5603 | int eflags; | |
5604 | { | |
5605 | char **glob_array, *temp_string; | |
5606 | register int glob_index; | |
5607 | WORD_LIST *glob_list, *output_list, *disposables, *next; | |
5608 | WORD_DESC *tword; | |
726f6388 | 5609 | |
cce855bc JA |
5610 | output_list = disposables = (WORD_LIST *)NULL; |
5611 | glob_array = (char **)NULL; | |
5612 | while (tlist) | |
5613 | { | |
5614 | /* For each word, either globbing is attempted or the word is | |
5615 | added to orig_list. If globbing succeeds, the results are | |
5616 | added to orig_list and the word (tlist) is added to the list | |
5617 | of disposable words. If globbing fails and failed glob | |
5618 | expansions are left unchanged (the shell default), the | |
5619 | original word is added to orig_list. If globbing fails and | |
5620 | failed glob expansions are removed, the original word is | |
5621 | added to the list of disposable words. orig_list ends up | |
5622 | in reverse order and requires a call to reverse_list to | |
5623 | be set right. After all words are examined, the disposable | |
5624 | words are freed. */ | |
5625 | next = tlist->next; | |
726f6388 | 5626 | |
cce855bc JA |
5627 | /* If the word isn't an assignment and contains an unquoted |
5628 | pattern matching character, then glob it. */ | |
b72432fd | 5629 | #if 0 |
cce855bc | 5630 | if ((tlist->word->flags & W_ASSIGNMENT) == 0 && |
b72432fd JA |
5631 | #else |
5632 | if ((tlist->word->flags & W_NOGLOB) == 0 && | |
5633 | #endif | |
cce855bc | 5634 | unquoted_glob_pattern_p (tlist->word->word)) |
726f6388 | 5635 | { |
cce855bc JA |
5636 | glob_array = shell_glob_filename (tlist->word->word); |
5637 | ||
5638 | /* Handle error cases. | |
5639 | I don't think we should report errors like "No such file | |
5640 | or directory". However, I would like to report errors | |
5641 | like "Read failed". */ | |
5642 | ||
5643 | if (GLOB_FAILED (glob_array)) | |
726f6388 | 5644 | { |
cce855bc JA |
5645 | glob_array = (char **) xmalloc (sizeof (char *)); |
5646 | glob_array[0] = (char *)NULL; | |
5647 | } | |
5648 | ||
5649 | /* Dequote the current word in case we have to use it. */ | |
5650 | if (glob_array[0] == NULL) | |
5651 | { | |
5652 | temp_string = dequote_string (tlist->word->word); | |
5653 | free (tlist->word->word); | |
5654 | tlist->word->word = temp_string; | |
5655 | } | |
5656 | ||
5657 | /* Make the array into a word list. */ | |
5658 | glob_list = (WORD_LIST *)NULL; | |
5659 | for (glob_index = 0; glob_array[glob_index]; glob_index++) | |
5660 | { | |
5661 | tword = make_bare_word (glob_array[glob_index]); | |
5662 | tword->flags |= W_GLOBEXP; /* XXX */ | |
5663 | glob_list = make_word_list (tword, glob_list); | |
5664 | } | |
5665 | ||
5666 | if (glob_list) | |
5667 | { | |
5668 | output_list = (WORD_LIST *)list_append (glob_list, output_list); | |
5669 | PREPEND_LIST (tlist, disposables); | |
5670 | } | |
5671 | else if (allow_null_glob_expansion == 0) | |
5672 | { | |
5673 | /* Failed glob expressions are left unchanged. */ | |
5674 | PREPEND_LIST (tlist, output_list); | |
5675 | } | |
5676 | else | |
5677 | { | |
5678 | /* Failed glob expressions are removed. */ | |
5679 | PREPEND_LIST (tlist, disposables); | |
726f6388 | 5680 | } |
726f6388 | 5681 | } |
cce855bc JA |
5682 | else |
5683 | { | |
5684 | /* Dequote the string. */ | |
5685 | temp_string = dequote_string (tlist->word->word); | |
5686 | free (tlist->word->word); | |
5687 | tlist->word->word = temp_string; | |
5688 | PREPEND_LIST (tlist, output_list); | |
5689 | } | |
5690 | ||
5691 | free_array (glob_array); | |
5692 | glob_array = (char **)NULL; | |
5693 | ||
5694 | tlist = next; | |
726f6388 JA |
5695 | } |
5696 | ||
cce855bc JA |
5697 | if (disposables) |
5698 | dispose_words (disposables); | |
5699 | ||
5700 | if (output_list) | |
5701 | output_list = REVERSE_LIST (output_list, WORD_LIST *); | |
5702 | ||
5703 | return (output_list); | |
5704 | } | |
726f6388 JA |
5705 | |
5706 | #if defined (BRACE_EXPANSION) | |
cce855bc JA |
5707 | static WORD_LIST * |
5708 | brace_expand_word_list (tlist, eflags) | |
5709 | WORD_LIST *tlist; | |
5710 | int eflags; | |
5711 | { | |
5712 | register char **expansions; | |
5713 | char *temp_string; | |
5714 | WORD_LIST *disposables, *output_list, *next; | |
5715 | WORD_DESC *w; | |
5716 | int eindex; | |
5717 | ||
5718 | for (disposables = output_list = (WORD_LIST *)NULL; tlist; tlist = next) | |
726f6388 | 5719 | { |
cce855bc | 5720 | next = tlist->next; |
726f6388 | 5721 | |
cce855bc JA |
5722 | /* Only do brace expansion if the word has a brace character. If |
5723 | not, just add the word list element to BRACES and continue. In | |
5724 | the common case, at least when running shell scripts, this will | |
5725 | degenerate to a bunch of calls to `strchr', and then what is | |
5726 | basically a reversal of TLIST into BRACES, which is corrected | |
5727 | by a call to reverse_list () on BRACES when the end of TLIST | |
5728 | is reached. */ | |
5729 | if (strchr (tlist->word->word, LBRACE)) | |
726f6388 | 5730 | { |
cce855bc | 5731 | expansions = brace_expand (tlist->word->word); |
726f6388 | 5732 | |
cce855bc | 5733 | for (eindex = 0; temp_string = expansions[eindex]; eindex++) |
726f6388 | 5734 | { |
cce855bc JA |
5735 | w = make_word (temp_string); |
5736 | /* If brace expansion didn't change the word, preserve | |
5737 | the flags. We may want to preserve the flags | |
5738 | unconditionally someday -- XXX */ | |
5739 | if (STREQ (temp_string, tlist->word->word)) | |
5740 | w->flags = tlist->word->flags; | |
5741 | output_list = make_word_list (w, output_list); | |
5742 | free (expansions[eindex]); | |
726f6388 | 5743 | } |
cce855bc | 5744 | free (expansions); |
726f6388 | 5745 | |
cce855bc JA |
5746 | /* Add TLIST to the list of words to be freed after brace |
5747 | expansion has been performed. */ | |
5748 | PREPEND_LIST (tlist, disposables); | |
5749 | } | |
5750 | else | |
5751 | PREPEND_LIST (tlist, output_list); | |
726f6388 | 5752 | } |
cce855bc JA |
5753 | |
5754 | if (disposables) | |
5755 | dispose_words (disposables); | |
5756 | ||
5757 | if (output_list) | |
5758 | output_list = REVERSE_LIST (output_list, WORD_LIST *); | |
5759 | ||
5760 | return (output_list); | |
5761 | } | |
5762 | #endif | |
5763 | ||
5764 | static WORD_LIST * | |
5765 | shell_expand_word_list (tlist, eflags) | |
5766 | WORD_LIST *tlist; | |
5767 | int eflags; | |
5768 | { | |
5769 | WORD_LIST *expanded, *orig_list, *new_list, *next, *temp_list; | |
5770 | int expanded_something, has_dollar_at; | |
5771 | char *temp_string; | |
726f6388 | 5772 | |
726f6388 | 5773 | /* We do tilde expansion all the time. This is what 1003.2 says. */ |
cce855bc JA |
5774 | new_list = (WORD_LIST *)NULL; |
5775 | for (orig_list = tlist; tlist; tlist = next) | |
726f6388 | 5776 | { |
ccc6cda3 | 5777 | temp_string = tlist->word->word; |
726f6388 JA |
5778 | |
5779 | next = tlist->next; | |
5780 | ||
5781 | /* Posix.2 section 3.6.1 says that tildes following `=' in words | |
5782 | which are not assignment statements are not expanded. We do | |
ccc6cda3 JA |
5783 | this only if POSIXLY_CORRECT is enabled. Essentially, we do |
5784 | tilde expansion on unquoted assignment statements (flags include | |
5785 | W_ASSIGNMENT but not W_QUOTED). */ | |
5786 | if (temp_string[0] == '~' || | |
5787 | (((tlist->word->flags & (W_ASSIGNMENT|W_QUOTED)) == W_ASSIGNMENT) && | |
5788 | posixly_correct == 0 && | |
5789 | strchr (temp_string, '~') && | |
5790 | (unquoted_substring ("=~", temp_string) || unquoted_substring (":~", temp_string)))) | |
726f6388 | 5791 | { |
ccc6cda3 JA |
5792 | tlist->word->word = bash_tilde_expand (temp_string); |
5793 | free (temp_string); | |
726f6388 JA |
5794 | } |
5795 | ||
ccc6cda3 | 5796 | expanded_something = 0; |
726f6388 | 5797 | expanded = expand_word_internal |
b72432fd | 5798 | (tlist->word, 0, 0, &has_dollar_at, &expanded_something); |
726f6388 JA |
5799 | |
5800 | if (expanded == &expand_word_error || expanded == &expand_word_fatal) | |
5801 | { | |
5802 | /* By convention, each time this error is returned, | |
5803 | tlist->word->word has already been freed. */ | |
5804 | tlist->word->word = (char *)NULL; | |
ccc6cda3 | 5805 | |
726f6388 JA |
5806 | /* Dispose our copy of the original list. */ |
5807 | dispose_words (orig_list); | |
d166f048 | 5808 | /* Dispose the new list we're building. */ |
726f6388 JA |
5809 | dispose_words (new_list); |
5810 | ||
5811 | if (expanded == &expand_word_error) | |
ccc6cda3 | 5812 | jump_to_top_level (DISCARD); |
726f6388 | 5813 | else |
ccc6cda3 | 5814 | jump_to_top_level (FORCE_EOF); |
726f6388 JA |
5815 | } |
5816 | ||
ccc6cda3 JA |
5817 | /* Don't split words marked W_NOSPLIT. */ |
5818 | if (expanded_something && (tlist->word->flags & W_NOSPLIT) == 0) | |
726f6388 | 5819 | { |
ccc6cda3 | 5820 | temp_list = word_list_split (expanded); |
726f6388 JA |
5821 | dispose_words (expanded); |
5822 | } | |
5823 | else | |
5824 | { | |
5825 | /* If no parameter expansion, command substitution, process | |
5826 | substitution, or arithmetic substitution took place, then | |
5827 | do not do word splitting. We still have to remove quoted | |
5828 | null characters from the result. */ | |
5829 | word_list_remove_quoted_nulls (expanded); | |
ccc6cda3 | 5830 | temp_list = expanded; |
726f6388 JA |
5831 | } |
5832 | ||
ccc6cda3 JA |
5833 | expanded = REVERSE_LIST (temp_list, WORD_LIST *); |
5834 | new_list = (WORD_LIST *)list_append (expanded, new_list); | |
726f6388 JA |
5835 | } |
5836 | ||
cce855bc JA |
5837 | if (orig_list) |
5838 | dispose_words (orig_list); | |
726f6388 | 5839 | |
726f6388 | 5840 | if (new_list) |
cce855bc | 5841 | new_list = REVERSE_LIST (new_list, WORD_LIST *); |
726f6388 | 5842 | |
cce855bc JA |
5843 | return (new_list); |
5844 | } | |
726f6388 | 5845 | |
cce855bc JA |
5846 | /* The workhorse for expand_words () and expand_words_no_vars (). |
5847 | First arg is LIST, a WORD_LIST of words. | |
b72432fd JA |
5848 | Second arg EFLAGS is a flags word controlling which expansions are |
5849 | performed. | |
726f6388 | 5850 | |
cce855bc JA |
5851 | This does all of the substitutions: brace expansion, tilde expansion, |
5852 | parameter expansion, command substitution, arithmetic expansion, | |
5853 | process substitution, word splitting, and pathname expansion, according | |
5854 | to the bits set in EFLAGS. Words with the W_QUOTED or W_NOSPLIT bits | |
5855 | set, or for which no expansion is done, do not undergo word splitting. | |
b72432fd | 5856 | Words with the W_NOGLOB bit set do not undergo pathname expansion. */ |
cce855bc JA |
5857 | static WORD_LIST * |
5858 | expand_word_list_internal (list, eflags) | |
5859 | WORD_LIST *list; | |
5860 | int eflags; | |
5861 | { | |
5862 | WORD_LIST *new_list, *temp_list; | |
5863 | int tint; | |
726f6388 | 5864 | |
cce855bc JA |
5865 | if (list == 0) |
5866 | return ((WORD_LIST *)NULL); | |
726f6388 | 5867 | |
cce855bc | 5868 | new_list = copy_word_list (list); |
726f6388 | 5869 | |
cce855bc JA |
5870 | if (eflags & WEXP_VARASSIGN) |
5871 | { | |
5872 | new_list = separate_out_assignments (new_list); | |
5873 | if (new_list == 0) | |
5874 | { | |
5875 | if (varlist) | |
5876 | { | |
5877 | /* All the words were variable assignments, so they are placed | |
5878 | into the shell's environment. */ | |
5879 | for (temp_list = varlist; temp_list; temp_list = temp_list->next) | |
5880 | { | |
5881 | this_command_name = (char *)NULL; /* no arithmetic errors */ | |
5882 | tint = do_assignment (temp_list->word->word); | |
5883 | /* Variable assignment errors in non-interactive shells | |
5884 | running in Posix.2 mode cause the shell to exit. */ | |
5885 | if (tint == 0 && interactive_shell == 0 && posixly_correct) | |
ccc6cda3 | 5886 | { |
cce855bc JA |
5887 | last_command_exit_value = EXECUTION_FAILURE; |
5888 | jump_to_top_level (FORCE_EOF); | |
ccc6cda3 | 5889 | } |
726f6388 | 5890 | } |
cce855bc JA |
5891 | dispose_words (varlist); |
5892 | varlist = (WORD_LIST *)NULL; | |
5893 | } | |
5894 | return ((WORD_LIST *)NULL); | |
5895 | } | |
5896 | } | |
726f6388 | 5897 | |
cce855bc JA |
5898 | /* Begin expanding the words that remain. The expansions take place on |
5899 | things that aren't really variable assignments. */ | |
726f6388 | 5900 | |
cce855bc JA |
5901 | #if defined (BRACE_EXPANSION) |
5902 | /* Do brace expansion on this word if there are any brace characters | |
5903 | in the string. */ | |
5904 | if ((eflags & WEXP_BRACEEXP) && brace_expansion && new_list) | |
5905 | new_list = brace_expand_word_list (new_list, eflags); | |
5906 | #endif /* BRACE_EXPANSION */ | |
726f6388 | 5907 | |
cce855bc JA |
5908 | /* Perform the `normal' shell expansions: tilde expansion, parameter and |
5909 | variable substitution, command substitution, arithmetic expansion, | |
5910 | and word splitting. */ | |
5911 | new_list = shell_expand_word_list (new_list, eflags); | |
726f6388 | 5912 | |
cce855bc JA |
5913 | /* Okay, we're almost done. Now let's just do some filename |
5914 | globbing. */ | |
5915 | if (new_list) | |
5916 | { | |
5917 | if ((eflags & WEXP_PATHEXP) && disallow_filename_globbing == 0) | |
5918 | /* Glob expand the word list unless globbing has been disabled. */ | |
5919 | new_list = glob_expand_word_list (new_list, eflags); | |
726f6388 | 5920 | else |
cce855bc JA |
5921 | /* Dequote the words, because we're not performing globbing. */ |
5922 | new_list = dequote_list (new_list); | |
726f6388 JA |
5923 | } |
5924 | ||
cce855bc | 5925 | if ((eflags & WEXP_VARASSIGN) && varlist) |
726f6388 | 5926 | { |
726f6388 JA |
5927 | Function *assign_func; |
5928 | ||
5929 | /* If the remainder of the words expand to nothing, Posix.2 requires | |
5930 | that the variable and environment assignments affect the shell's | |
5931 | environment. */ | |
5932 | assign_func = new_list ? assign_in_env : do_assignment; | |
5933 | ||
ccc6cda3 | 5934 | for (temp_list = varlist; temp_list; temp_list = temp_list->next) |
726f6388 | 5935 | { |
ccc6cda3 JA |
5936 | this_command_name = (char *)NULL; |
5937 | tint = (*assign_func) (temp_list->word->word); | |
5938 | /* Variable assignment errors in non-interactive shells running | |
5939 | in Posix.2 mode cause the shell to exit. */ | |
5940 | if (tint == 0 && assign_func == do_assignment && | |
5941 | interactive_shell == 0 && posixly_correct) | |
5942 | { | |
5943 | last_command_exit_value = EXECUTION_FAILURE; | |
5944 | jump_to_top_level (FORCE_EOF); | |
5945 | } | |
726f6388 | 5946 | } |
726f6388 | 5947 | |
ccc6cda3 JA |
5948 | dispose_words (varlist); |
5949 | varlist = (WORD_LIST *)NULL; | |
726f6388 JA |
5950 | } |
5951 | ||
cce855bc | 5952 | #if 0 |
ccc6cda3 JA |
5953 | tint = list_length (new_list) + 1; |
5954 | RESIZE_MALLOCED_BUFFER (glob_argv_flags, 0, tint, glob_argv_flags_size, 16); | |
cce855bc JA |
5955 | for (tint = 0, temp_list = new_list; temp_list; temp_list = temp_list->next) |
5956 | glob_argv_flags[tint++] = (temp_list->word->flags & W_GLOBEXP) ? '1' : '0'; | |
ccc6cda3 | 5957 | glob_argv_flags[tint] = '\0'; |
ccc6cda3 | 5958 | #endif |
726f6388 | 5959 | |
cce855bc | 5960 | return (new_list); |
ccc6cda3 | 5961 | } |