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f73dda09 JA |
1 | /* arrayfunc.c -- High-level array functions used by other parts of the shell. */ |
2 | ||
3185942a | 3 | /* Copyright (C) 2001-2009 Free Software Foundation, Inc. |
f73dda09 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
f73dda09 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
f73dda09 | 16 | |
3185942a JA |
17 | You should have received a copy of the GNU General Public License |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
f73dda09 JA |
20 | |
21 | #include "config.h" | |
22 | ||
23 | #if defined (ARRAY_VARS) | |
24 | ||
25 | #if defined (HAVE_UNISTD_H) | |
26 | # include <unistd.h> | |
27 | #endif | |
28 | #include <stdio.h> | |
29 | ||
b80f6443 JA |
30 | #include "bashintl.h" |
31 | ||
f73dda09 | 32 | #include "shell.h" |
3185942a | 33 | #include "pathexp.h" |
7117c2d2 JA |
34 | |
35 | #include "shmbutil.h" | |
36 | ||
f73dda09 JA |
37 | #include "builtins/common.h" |
38 | ||
39 | extern char *this_command_name; | |
40 | extern int last_command_exit_value; | |
95732b49 JA |
41 | extern int array_needs_making; |
42 | ||
3185942a | 43 | static SHELL_VAR *bind_array_var_internal __P((SHELL_VAR *, arrayind_t, char *, char *, int)); |
f73dda09 | 44 | |
3185942a | 45 | static char *quote_assign __P((const char *)); |
f73dda09 | 46 | static void quote_array_assignment_chars __P((WORD_LIST *)); |
7117c2d2 | 47 | static char *array_value_internal __P((char *, int, int, int *)); |
f73dda09 | 48 | |
b80f6443 | 49 | /* Standard error message to use when encountering an invalid array subscript */ |
3185942a | 50 | const char * const bash_badsub_errmsg = N_("bad array subscript"); |
b80f6443 | 51 | |
f73dda09 JA |
52 | /* **************************************************************** */ |
53 | /* */ | |
54 | /* Functions to manipulate array variables and perform assignments */ | |
55 | /* */ | |
56 | /* **************************************************************** */ | |
57 | ||
58 | /* Convert a shell variable to an array variable. The original value is | |
59 | saved as array[0]. */ | |
60 | SHELL_VAR * | |
61 | convert_var_to_array (var) | |
62 | SHELL_VAR *var; | |
63 | { | |
64 | char *oldval; | |
65 | ARRAY *array; | |
66 | ||
67 | oldval = value_cell (var); | |
7117c2d2 | 68 | array = array_create (); |
b80f6443 JA |
69 | if (oldval) |
70 | array_insert (array, 0, oldval); | |
f73dda09 JA |
71 | |
72 | FREE (value_cell (var)); | |
7117c2d2 JA |
73 | var_setarray (var, array); |
74 | ||
75 | /* these aren't valid anymore */ | |
76 | var->dynamic_value = (sh_var_value_func_t *)NULL; | |
77 | var->assign_func = (sh_var_assign_func_t *)NULL; | |
f73dda09 JA |
78 | |
79 | INVALIDATE_EXPORTSTR (var); | |
95732b49 JA |
80 | if (exported_p (var)) |
81 | array_needs_making++; | |
f73dda09 JA |
82 | |
83 | VSETATTR (var, att_array); | |
84 | VUNSETATTR (var, att_invisible); | |
85 | ||
86 | return var; | |
87 | } | |
88 | ||
3185942a JA |
89 | /* Convert a shell variable to an array variable. The original value is |
90 | saved as array[0]. */ | |
91 | SHELL_VAR * | |
92 | convert_var_to_assoc (var) | |
93 | SHELL_VAR *var; | |
94 | { | |
95 | char *oldval; | |
96 | HASH_TABLE *hash; | |
97 | ||
98 | oldval = value_cell (var); | |
99 | hash = assoc_create (0); | |
100 | if (oldval) | |
89a92869 | 101 | assoc_insert (hash, savestring ("0"), oldval); |
3185942a JA |
102 | |
103 | FREE (value_cell (var)); | |
104 | var_setassoc (var, hash); | |
105 | ||
106 | /* these aren't valid anymore */ | |
107 | var->dynamic_value = (sh_var_value_func_t *)NULL; | |
108 | var->assign_func = (sh_var_assign_func_t *)NULL; | |
109 | ||
110 | INVALIDATE_EXPORTSTR (var); | |
111 | if (exported_p (var)) | |
112 | array_needs_making++; | |
113 | ||
114 | VSETATTR (var, att_assoc); | |
115 | VUNSETATTR (var, att_invisible); | |
116 | ||
117 | return var; | |
118 | } | |
119 | ||
95732b49 | 120 | static SHELL_VAR * |
3185942a | 121 | bind_array_var_internal (entry, ind, key, value, flags) |
95732b49 JA |
122 | SHELL_VAR *entry; |
123 | arrayind_t ind; | |
3185942a | 124 | char *key; |
95732b49 JA |
125 | char *value; |
126 | int flags; | |
127 | { | |
128 | SHELL_VAR *dentry; | |
129 | char *newval; | |
130 | ||
131 | /* If we're appending, we need the old value of the array reference, so | |
132 | fake out make_variable_value with a dummy SHELL_VAR */ | |
133 | if (flags & ASS_APPEND) | |
134 | { | |
135 | dentry = (SHELL_VAR *)xmalloc (sizeof (SHELL_VAR)); | |
136 | dentry->name = savestring (entry->name); | |
3185942a JA |
137 | if (assoc_p (entry)) |
138 | newval = assoc_reference (assoc_cell (entry), key); | |
139 | else | |
140 | newval = array_reference (array_cell (entry), ind); | |
95732b49 JA |
141 | if (newval) |
142 | dentry->value = savestring (newval); | |
143 | else | |
144 | { | |
145 | dentry->value = (char *)xmalloc (1); | |
146 | dentry->value[0] = '\0'; | |
147 | } | |
148 | dentry->exportstr = 0; | |
3185942a | 149 | dentry->attributes = entry->attributes & ~(att_array|att_assoc|att_exported); |
95732b49 JA |
150 | /* Leave the rest of the members uninitialized; the code doesn't look |
151 | at them. */ | |
152 | newval = make_variable_value (dentry, value, flags); | |
153 | dispose_variable (dentry); | |
154 | } | |
155 | else | |
156 | newval = make_variable_value (entry, value, flags); | |
157 | ||
158 | if (entry->assign_func) | |
3185942a JA |
159 | (*entry->assign_func) (entry, newval, ind, key); |
160 | else if (assoc_p (entry)) | |
161 | assoc_insert (assoc_cell (entry), key, newval); | |
95732b49 JA |
162 | else |
163 | array_insert (array_cell (entry), ind, newval); | |
164 | FREE (newval); | |
165 | ||
166 | return (entry); | |
167 | } | |
168 | ||
f73dda09 JA |
169 | /* Perform an array assignment name[ind]=value. If NAME already exists and |
170 | is not an array, and IND is 0, perform name=value instead. If NAME exists | |
171 | and is not an array, and IND is not 0, convert it into an array with the | |
172 | existing value as name[0]. | |
173 | ||
174 | If NAME does not exist, just create an array variable, no matter what | |
175 | IND's value may be. */ | |
176 | SHELL_VAR * | |
95732b49 | 177 | bind_array_variable (name, ind, value, flags) |
f73dda09 JA |
178 | char *name; |
179 | arrayind_t ind; | |
180 | char *value; | |
95732b49 | 181 | int flags; |
f73dda09 JA |
182 | { |
183 | SHELL_VAR *entry; | |
f73dda09 JA |
184 | |
185 | entry = var_lookup (name, shell_variables); | |
186 | ||
187 | if (entry == (SHELL_VAR *) 0) | |
188 | entry = make_new_array_variable (name); | |
189 | else if (readonly_p (entry) || noassign_p (entry)) | |
190 | { | |
191 | if (readonly_p (entry)) | |
7117c2d2 | 192 | err_readonly (name); |
f73dda09 JA |
193 | return (entry); |
194 | } | |
195 | else if (array_p (entry) == 0) | |
196 | entry = convert_var_to_array (entry); | |
197 | ||
198 | /* ENTRY is an array variable, and ARRAY points to the value. */ | |
3185942a JA |
199 | return (bind_array_var_internal (entry, ind, 0, value, flags)); |
200 | } | |
201 | ||
202 | SHELL_VAR * | |
203 | bind_array_element (entry, ind, value, flags) | |
204 | SHELL_VAR *entry; | |
205 | arrayind_t ind; | |
206 | char *value; | |
207 | int flags; | |
208 | { | |
209 | return (bind_array_var_internal (entry, ind, 0, value, flags)); | |
210 | } | |
211 | ||
212 | SHELL_VAR * | |
213 | bind_assoc_variable (entry, name, key, value, flags) | |
214 | SHELL_VAR *entry; | |
215 | char *name; | |
216 | char *key; | |
217 | char *value; | |
218 | int flags; | |
219 | { | |
220 | SHELL_VAR *dentry; | |
221 | char *newval; | |
222 | ||
223 | if (readonly_p (entry) || noassign_p (entry)) | |
224 | { | |
225 | if (readonly_p (entry)) | |
226 | err_readonly (name); | |
227 | return (entry); | |
228 | } | |
229 | ||
230 | return (bind_array_var_internal (entry, 0, key, value, flags)); | |
f73dda09 JA |
231 | } |
232 | ||
233 | /* Parse NAME, a lhs of an assignment statement of the form v[s], and | |
234 | assign VALUE to that array element by calling bind_array_variable(). */ | |
235 | SHELL_VAR * | |
95732b49 | 236 | assign_array_element (name, value, flags) |
f73dda09 | 237 | char *name, *value; |
95732b49 | 238 | int flags; |
f73dda09 | 239 | { |
3185942a | 240 | char *sub, *vname, *akey; |
f73dda09 JA |
241 | arrayind_t ind; |
242 | int sublen; | |
243 | SHELL_VAR *entry; | |
244 | ||
245 | vname = array_variable_name (name, &sub, &sublen); | |
246 | ||
247 | if (vname == 0) | |
248 | return ((SHELL_VAR *)NULL); | |
249 | ||
250 | if ((ALL_ELEMENT_SUB (sub[0]) && sub[1] == ']') || (sublen <= 1)) | |
251 | { | |
252 | free (vname); | |
7117c2d2 | 253 | err_badarraysub (name); |
f73dda09 JA |
254 | return ((SHELL_VAR *)NULL); |
255 | } | |
256 | ||
3185942a JA |
257 | entry = find_variable (vname); |
258 | ||
259 | if (entry && assoc_p (entry)) | |
f73dda09 | 260 | { |
3185942a JA |
261 | sub[sublen-1] = '\0'; |
262 | akey = expand_assignment_string_to_string (sub, 0); /* [ */ | |
263 | sub[sublen-1] = ']'; | |
264 | if (akey == 0 || *akey == 0) | |
265 | { | |
266 | free (vname); | |
267 | err_badarraysub (name); | |
268 | return ((SHELL_VAR *)NULL); | |
269 | } | |
270 | entry = bind_assoc_variable (entry, vname, akey, value, flags); | |
271 | } | |
272 | else | |
273 | { | |
274 | ind = array_expand_index (sub, sublen); | |
275 | if (ind < 0) | |
276 | { | |
277 | free (vname); | |
278 | err_badarraysub (name); | |
279 | return ((SHELL_VAR *)NULL); | |
280 | } | |
281 | entry = bind_array_variable (vname, ind, value, flags); | |
f73dda09 | 282 | } |
f73dda09 JA |
283 | |
284 | free (vname); | |
285 | return (entry); | |
286 | } | |
287 | ||
288 | /* Find the array variable corresponding to NAME. If there is no variable, | |
289 | create a new array variable. If the variable exists but is not an array, | |
3185942a | 290 | convert it to an indexed array. If FLAGS&1 is non-zero, an existing |
f73dda09 | 291 | variable is checked for the readonly or noassign attribute in preparation |
3185942a JA |
292 | for assignment (e.g., by the `read' builtin). If FLAGS&2 is non-zero, we |
293 | create an associative array. */ | |
f73dda09 | 294 | SHELL_VAR * |
3185942a | 295 | find_or_make_array_variable (name, flags) |
f73dda09 | 296 | char *name; |
3185942a | 297 | int flags; |
f73dda09 JA |
298 | { |
299 | SHELL_VAR *var; | |
300 | ||
301 | var = find_variable (name); | |
302 | ||
303 | if (var == 0) | |
3185942a JA |
304 | var = (flags & 2) ? make_new_assoc_variable (name) : make_new_array_variable (name); |
305 | else if ((flags & 1) && (readonly_p (var) || noassign_p (var))) | |
f73dda09 JA |
306 | { |
307 | if (readonly_p (var)) | |
7117c2d2 | 308 | err_readonly (name); |
f73dda09 JA |
309 | return ((SHELL_VAR *)NULL); |
310 | } | |
3185942a JA |
311 | else if ((flags & 2) && array_p (var)) |
312 | { | |
313 | report_error (_("%s: cannot convert indexed to associative array"), name); | |
314 | return ((SHELL_VAR *)NULL); | |
315 | } | |
316 | else if (array_p (var) == 0 && assoc_p (var) == 0) | |
f73dda09 JA |
317 | var = convert_var_to_array (var); |
318 | ||
319 | return (var); | |
320 | } | |
321 | ||
322 | /* Perform a compound assignment statement for array NAME, where VALUE is | |
323 | the text between the parens: NAME=( VALUE ) */ | |
324 | SHELL_VAR * | |
95732b49 | 325 | assign_array_from_string (name, value, flags) |
f73dda09 | 326 | char *name, *value; |
95732b49 | 327 | int flags; |
f73dda09 JA |
328 | { |
329 | SHELL_VAR *var; | |
3185942a | 330 | int vflags; |
f73dda09 | 331 | |
3185942a JA |
332 | vflags = 1; |
333 | if (flags & ASS_MKASSOC) | |
334 | vflags |= 2; | |
335 | ||
336 | var = find_or_make_array_variable (name, vflags); | |
f73dda09 JA |
337 | if (var == 0) |
338 | return ((SHELL_VAR *)NULL); | |
339 | ||
95732b49 | 340 | return (assign_array_var_from_string (var, value, flags)); |
f73dda09 JA |
341 | } |
342 | ||
343 | /* Sequentially assign the indices of indexed array variable VAR from the | |
344 | words in LIST. */ | |
345 | SHELL_VAR * | |
95732b49 | 346 | assign_array_var_from_word_list (var, list, flags) |
f73dda09 JA |
347 | SHELL_VAR *var; |
348 | WORD_LIST *list; | |
95732b49 | 349 | int flags; |
f73dda09 JA |
350 | { |
351 | register arrayind_t i; | |
352 | register WORD_LIST *l; | |
353 | ARRAY *a; | |
354 | ||
95732b49 JA |
355 | a = array_cell (var); |
356 | i = (flags & ASS_APPEND) ? array_max_index (a) + 1 : 0; | |
357 | ||
358 | for (l = list; l; l = l->next, i++) | |
f73dda09 | 359 | if (var->assign_func) |
3185942a | 360 | (*var->assign_func) (var, l->word->word, i, 0); |
f73dda09 | 361 | else |
7117c2d2 | 362 | array_insert (a, i, l->word->word); |
f73dda09 JA |
363 | return var; |
364 | } | |
365 | ||
0628567a | 366 | WORD_LIST * |
3185942a JA |
367 | expand_compound_array_assignment (var, value, flags) |
368 | SHELL_VAR *var; | |
f73dda09 | 369 | char *value; |
95732b49 | 370 | int flags; |
f73dda09 | 371 | { |
f73dda09 | 372 | WORD_LIST *list, *nlist; |
0628567a JA |
373 | char *val; |
374 | int ni; | |
f73dda09 | 375 | |
0628567a | 376 | /* I don't believe this condition is ever true any more. */ |
f73dda09 JA |
377 | if (*value == '(') /*)*/ |
378 | { | |
379 | ni = 1; | |
380 | val = extract_array_assignment_list (value, &ni); | |
381 | if (val == 0) | |
0628567a | 382 | return (WORD_LIST *)NULL; |
f73dda09 JA |
383 | } |
384 | else | |
385 | val = value; | |
386 | ||
387 | /* Expand the value string into a list of words, performing all the | |
388 | shell expansions including pathname generation and word splitting. */ | |
389 | /* First we split the string on whitespace, using the shell parser | |
390 | (ksh93 seems to do this). */ | |
b80f6443 | 391 | list = parse_string_to_word_list (val, 1, "array assign"); |
f73dda09 JA |
392 | |
393 | /* If we're using [subscript]=value, we need to quote each [ and ] to | |
394 | prevent unwanted filename expansion. */ | |
395 | if (list) | |
396 | quote_array_assignment_chars (list); | |
397 | ||
398 | /* Now that we've split it, perform the shell expansions on each | |
399 | word in the list. */ | |
400 | nlist = list ? expand_words_no_vars (list) : (WORD_LIST *)NULL; | |
401 | ||
402 | dispose_words (list); | |
403 | ||
404 | if (val != value) | |
405 | free (val); | |
406 | ||
0628567a JA |
407 | return nlist; |
408 | } | |
409 | ||
410 | void | |
411 | assign_compound_array_list (var, nlist, flags) | |
412 | SHELL_VAR *var; | |
413 | WORD_LIST *nlist; | |
414 | int flags; | |
415 | { | |
416 | ARRAY *a; | |
3185942a | 417 | HASH_TABLE *h; |
0628567a JA |
418 | WORD_LIST *list; |
419 | char *w, *val, *nval; | |
420 | int len, iflags; | |
421 | arrayind_t ind, last_ind; | |
3185942a | 422 | char *akey; |
0628567a | 423 | |
3185942a JA |
424 | a = (var && array_p (var)) ? array_cell (var) : (ARRAY *)0; |
425 | h = (var && assoc_p (var)) ? assoc_cell (var) : (HASH_TABLE *)0; | |
426 | ||
427 | akey = (char *)0; | |
428 | ind = 0; | |
f73dda09 JA |
429 | |
430 | /* Now that we are ready to assign values to the array, kill the existing | |
431 | value. */ | |
3185942a JA |
432 | if ((flags & ASS_APPEND) == 0) |
433 | { | |
434 | if (array_p (var) && a) | |
435 | array_flush (a); | |
436 | else if (assoc_p (var) && h) | |
437 | assoc_flush (h); | |
438 | } | |
439 | ||
440 | last_ind = (a && (flags & ASS_APPEND)) ? array_max_index (a) + 1 : 0; | |
f73dda09 | 441 | |
95732b49 | 442 | for (list = nlist; list; list = list->next) |
f73dda09 | 443 | { |
0628567a | 444 | iflags = flags; |
f73dda09 JA |
445 | w = list->word->word; |
446 | ||
447 | /* We have a word of the form [ind]=value */ | |
b80f6443 | 448 | if ((list->word->flags & W_ASSIGNMENT) && w[0] == '[') |
f73dda09 JA |
449 | { |
450 | len = skipsubscript (w, 0); | |
451 | ||
95732b49 JA |
452 | /* XXX - changes for `+=' */ |
453 | if (w[len] != ']' || (w[len+1] != '=' && (w[len+1] != '+' || w[len+2] != '='))) | |
f73dda09 | 454 | { |
3185942a JA |
455 | if (assoc_p (var)) |
456 | { | |
457 | err_badarraysub (w); | |
458 | continue; | |
459 | } | |
95732b49 | 460 | nval = make_variable_value (var, w, flags); |
f73dda09 | 461 | if (var->assign_func) |
3185942a | 462 | (*var->assign_func) (var, nval, last_ind, 0); |
f73dda09 | 463 | else |
7117c2d2 | 464 | array_insert (a, last_ind, nval); |
f73dda09 JA |
465 | FREE (nval); |
466 | last_ind++; | |
467 | continue; | |
468 | } | |
469 | ||
470 | if (len == 1) | |
471 | { | |
7117c2d2 | 472 | err_badarraysub (w); |
f73dda09 JA |
473 | continue; |
474 | } | |
475 | ||
476 | if (ALL_ELEMENT_SUB (w[1]) && len == 2) | |
477 | { | |
3185942a JA |
478 | if (assoc_p (var)) |
479 | report_error (_("%s: invalid associative array key"), w); | |
480 | else | |
481 | report_error (_("%s: cannot assign to non-numeric index"), w); | |
f73dda09 JA |
482 | continue; |
483 | } | |
484 | ||
3185942a | 485 | if (array_p (var)) |
f73dda09 | 486 | { |
3185942a JA |
487 | ind = array_expand_index (w + 1, len); |
488 | if (ind < 0) | |
489 | { | |
490 | err_badarraysub (w); | |
491 | continue; | |
492 | } | |
493 | ||
494 | last_ind = ind; | |
f73dda09 | 495 | } |
3185942a JA |
496 | else if (assoc_p (var)) |
497 | { | |
498 | akey = substring (w, 1, len); | |
499 | if (akey == 0 || *akey == 0) | |
500 | { | |
501 | err_badarraysub (w); | |
502 | continue; | |
503 | } | |
504 | } | |
505 | ||
0628567a | 506 | /* XXX - changes for `+=' -- just accept the syntax. ksh93 doesn't do this */ |
95732b49 JA |
507 | if (w[len + 1] == '+' && w[len + 2] == '=') |
508 | { | |
0628567a | 509 | iflags |= ASS_APPEND; |
95732b49 JA |
510 | val = w + len + 3; |
511 | } | |
512 | else | |
513 | val = w + len + 2; | |
f73dda09 | 514 | } |
3185942a JA |
515 | else if (assoc_p (var)) |
516 | { | |
517 | report_error (_("%s: %s: must use subscript when assigning associative array"), var->name, w); | |
518 | continue; | |
519 | } | |
f73dda09 JA |
520 | else /* No [ind]=value, just a stray `=' */ |
521 | { | |
522 | ind = last_ind; | |
523 | val = w; | |
524 | } | |
525 | ||
526 | if (integer_p (var)) | |
527 | this_command_name = (char *)NULL; /* no command name for errors */ | |
3185942a | 528 | bind_array_var_internal (var, ind, akey, val, iflags); |
f73dda09 JA |
529 | last_ind++; |
530 | } | |
0628567a | 531 | } |
f73dda09 | 532 | |
0628567a JA |
533 | /* Perform a compound array assignment: VAR->name=( VALUE ). The |
534 | VALUE has already had the parentheses stripped. */ | |
535 | SHELL_VAR * | |
536 | assign_array_var_from_string (var, value, flags) | |
537 | SHELL_VAR *var; | |
538 | char *value; | |
539 | int flags; | |
540 | { | |
541 | WORD_LIST *nlist; | |
542 | ||
543 | if (value == 0) | |
544 | return var; | |
545 | ||
3185942a | 546 | nlist = expand_compound_array_assignment (var, value, flags); |
0628567a JA |
547 | assign_compound_array_list (var, nlist, flags); |
548 | ||
549 | if (nlist) | |
550 | dispose_words (nlist); | |
f73dda09 JA |
551 | return (var); |
552 | } | |
553 | ||
3185942a JA |
554 | /* Quote globbing chars and characters in $IFS before the `=' in an assignment |
555 | statement (usually a compound array assignment) to protect them from | |
556 | unwanted filename expansion or word splitting. */ | |
557 | static char * | |
558 | quote_assign (string) | |
559 | const char *string; | |
560 | { | |
561 | size_t slen; | |
562 | int saw_eq; | |
563 | char *temp, *t; | |
564 | const char *s, *send; | |
565 | DECLARE_MBSTATE; | |
566 | ||
567 | slen = strlen (string); | |
568 | send = string + slen; | |
569 | ||
570 | t = temp = (char *)xmalloc (slen * 2 + 1); | |
571 | saw_eq = 0; | |
572 | for (s = string; *s; ) | |
573 | { | |
574 | if (*s == '=') | |
575 | saw_eq = 1; | |
576 | if (saw_eq == 0 && (glob_char_p (s) || isifs (*s))) | |
577 | *t++ = '\\'; | |
578 | ||
579 | COPY_CHAR_P (t, s, send); | |
580 | } | |
581 | *t = '\0'; | |
582 | return temp; | |
583 | } | |
584 | ||
f73dda09 | 585 | /* For each word in a compound array assignment, if the word looks like |
3185942a | 586 | [ind]=value, quote globbing chars and characters in $IFS before the `='. */ |
f73dda09 JA |
587 | static void |
588 | quote_array_assignment_chars (list) | |
589 | WORD_LIST *list; | |
590 | { | |
3185942a | 591 | char *nword; |
f73dda09 JA |
592 | WORD_LIST *l; |
593 | ||
594 | for (l = list; l; l = l->next) | |
595 | { | |
596 | if (l->word == 0 || l->word->word == 0 || l->word->word[0] == '\0') | |
597 | continue; /* should not happen, but just in case... */ | |
598 | /* Don't bother if it doesn't look like [ind]=value */ | |
7117c2d2 | 599 | if (l->word->word[0] != '[' || xstrchr (l->word->word, '=') == 0) /* ] */ |
f73dda09 | 600 | continue; |
3185942a | 601 | nword = quote_assign (l->word->word); |
f73dda09 JA |
602 | free (l->word->word); |
603 | l->word->word = nword; | |
604 | } | |
605 | } | |
606 | ||
89a92869 | 607 | /* skipsubscript moved to subst.c to use private functions. 2009/02/24. */ |
f73dda09 JA |
608 | |
609 | /* This function is called with SUB pointing to just after the beginning | |
610 | `[' of an array subscript and removes the array element to which SUB | |
611 | expands from array VAR. A subscript of `*' or `@' unsets the array. */ | |
612 | int | |
613 | unbind_array_element (var, sub) | |
614 | SHELL_VAR *var; | |
615 | char *sub; | |
616 | { | |
617 | int len; | |
618 | arrayind_t ind; | |
3185942a | 619 | char *akey; |
f73dda09 JA |
620 | ARRAY_ELEMENT *ae; |
621 | ||
622 | len = skipsubscript (sub, 0); | |
623 | if (sub[len] != ']' || len == 0) | |
624 | { | |
b80f6443 | 625 | builtin_error ("%s[%s: %s", var->name, sub, _(bash_badsub_errmsg)); |
f73dda09 JA |
626 | return -1; |
627 | } | |
628 | sub[len] = '\0'; | |
629 | ||
630 | if (ALL_ELEMENT_SUB (sub[0]) && sub[1] == 0) | |
631 | { | |
7117c2d2 | 632 | unbind_variable (var->name); |
f73dda09 JA |
633 | return (0); |
634 | } | |
3185942a JA |
635 | |
636 | if (assoc_p (var)) | |
f73dda09 | 637 | { |
3185942a JA |
638 | akey = expand_assignment_string_to_string (sub, 0); /* [ */ |
639 | if (akey == 0 || *akey == 0) | |
640 | { | |
641 | builtin_error ("[%s]: %s", sub, _(bash_badsub_errmsg)); | |
642 | return -1; | |
643 | } | |
644 | assoc_remove (assoc_cell (var), akey); | |
645 | } | |
646 | else | |
647 | { | |
648 | ind = array_expand_index (sub, len+1); | |
649 | if (ind < 0) | |
650 | { | |
651 | builtin_error ("[%s]: %s", sub, _(bash_badsub_errmsg)); | |
652 | return -1; | |
653 | } | |
654 | ae = array_remove (array_cell (var), ind); | |
655 | if (ae) | |
656 | array_dispose_element (ae); | |
f73dda09 | 657 | } |
3185942a | 658 | |
f73dda09 JA |
659 | return 0; |
660 | } | |
661 | ||
662 | /* Format and output an array assignment in compound form VAR=(VALUES), | |
663 | suitable for re-use as input. */ | |
664 | void | |
665 | print_array_assignment (var, quoted) | |
666 | SHELL_VAR *var; | |
667 | int quoted; | |
668 | { | |
669 | char *vstr; | |
670 | ||
7117c2d2 | 671 | vstr = array_to_assign (array_cell (var), quoted); |
f73dda09 JA |
672 | |
673 | if (vstr == 0) | |
674 | printf ("%s=%s\n", var->name, quoted ? "'()'" : "()"); | |
675 | else | |
676 | { | |
677 | printf ("%s=%s\n", var->name, vstr); | |
678 | free (vstr); | |
679 | } | |
680 | } | |
681 | ||
3185942a JA |
682 | /* Format and output an associative array assignment in compound form |
683 | VAR=(VALUES), suitable for re-use as input. */ | |
684 | void | |
685 | print_assoc_assignment (var, quoted) | |
686 | SHELL_VAR *var; | |
687 | int quoted; | |
688 | { | |
689 | char *vstr; | |
690 | ||
691 | vstr = assoc_to_assign (assoc_cell (var), quoted); | |
692 | ||
693 | if (vstr == 0) | |
694 | printf ("%s=%s\n", var->name, quoted ? "'()'" : "()"); | |
695 | else | |
696 | { | |
697 | printf ("%s=%s\n", var->name, vstr); | |
698 | free (vstr); | |
699 | } | |
700 | } | |
701 | ||
f73dda09 JA |
702 | /***********************************************************************/ |
703 | /* */ | |
704 | /* Utility functions to manage arrays and their contents for expansion */ | |
705 | /* */ | |
706 | /***********************************************************************/ | |
707 | ||
708 | /* Return 1 if NAME is a properly-formed array reference v[sub]. */ | |
709 | int | |
710 | valid_array_reference (name) | |
711 | char *name; | |
712 | { | |
713 | char *t; | |
714 | int r, len; | |
715 | ||
7117c2d2 | 716 | t = xstrchr (name, '['); /* ] */ |
f73dda09 JA |
717 | if (t) |
718 | { | |
719 | *t = '\0'; | |
720 | r = legal_identifier (name); | |
721 | *t = '['; | |
722 | if (r == 0) | |
723 | return 0; | |
724 | /* Check for a properly-terminated non-blank subscript. */ | |
725 | len = skipsubscript (t, 0); | |
726 | if (t[len] != ']' || len == 1) | |
727 | return 0; | |
728 | for (r = 1; r < len; r++) | |
729 | if (whitespace (t[r]) == 0) | |
730 | return 1; | |
731 | return 0; | |
732 | } | |
733 | return 0; | |
734 | } | |
735 | ||
736 | /* Expand the array index beginning at S and extending LEN characters. */ | |
737 | arrayind_t | |
738 | array_expand_index (s, len) | |
739 | char *s; | |
740 | int len; | |
741 | { | |
742 | char *exp, *t; | |
743 | int expok; | |
744 | arrayind_t val; | |
745 | ||
746 | exp = (char *)xmalloc (len); | |
747 | strncpy (exp, s, len - 1); | |
748 | exp[len - 1] = '\0'; | |
0628567a | 749 | t = expand_arith_string (exp, 0); |
f73dda09 JA |
750 | this_command_name = (char *)NULL; |
751 | val = evalexp (t, &expok); | |
752 | free (t); | |
753 | free (exp); | |
754 | if (expok == 0) | |
755 | { | |
756 | last_command_exit_value = EXECUTION_FAILURE; | |
f1be666c JA |
757 | |
758 | top_level_cleanup (); | |
f73dda09 JA |
759 | jump_to_top_level (DISCARD); |
760 | } | |
761 | return val; | |
762 | } | |
763 | ||
764 | /* Return the name of the variable specified by S without any subscript. | |
765 | If SUBP is non-null, return a pointer to the start of the subscript | |
766 | in *SUBP. If LENP is non-null, the length of the subscript is returned | |
767 | in *LENP. This returns newly-allocated memory. */ | |
768 | char * | |
769 | array_variable_name (s, subp, lenp) | |
770 | char *s, **subp; | |
771 | int *lenp; | |
772 | { | |
773 | char *t, *ret; | |
774 | int ind, ni; | |
775 | ||
7117c2d2 | 776 | t = xstrchr (s, '['); |
f73dda09 | 777 | if (t == 0) |
b80f6443 JA |
778 | { |
779 | if (subp) | |
780 | *subp = t; | |
781 | if (lenp) | |
782 | *lenp = 0; | |
783 | return ((char *)NULL); | |
784 | } | |
f73dda09 JA |
785 | ind = t - s; |
786 | ni = skipsubscript (s, ind); | |
787 | if (ni <= ind + 1 || s[ni] != ']') | |
788 | { | |
7117c2d2 | 789 | err_badarraysub (s); |
b80f6443 JA |
790 | if (subp) |
791 | *subp = t; | |
792 | if (lenp) | |
793 | *lenp = 0; | |
f73dda09 JA |
794 | return ((char *)NULL); |
795 | } | |
796 | ||
797 | *t = '\0'; | |
798 | ret = savestring (s); | |
799 | *t++ = '['; /* ] */ | |
800 | ||
801 | if (subp) | |
802 | *subp = t; | |
803 | if (lenp) | |
804 | *lenp = ni - ind; | |
805 | ||
806 | return ret; | |
807 | } | |
808 | ||
809 | /* Return the variable specified by S without any subscript. If SUBP is | |
810 | non-null, return a pointer to the start of the subscript in *SUBP. | |
811 | If LENP is non-null, the length of the subscript is returned in *LENP. */ | |
812 | SHELL_VAR * | |
813 | array_variable_part (s, subp, lenp) | |
814 | char *s, **subp; | |
815 | int *lenp; | |
816 | { | |
817 | char *t; | |
818 | SHELL_VAR *var; | |
819 | ||
820 | t = array_variable_name (s, subp, lenp); | |
821 | if (t == 0) | |
822 | return ((SHELL_VAR *)NULL); | |
823 | var = find_variable (t); | |
824 | ||
825 | free (t); | |
eb873671 | 826 | return (var == 0 || invisible_p (var)) ? (SHELL_VAR *)0 : var; |
f73dda09 JA |
827 | } |
828 | ||
829 | /* Return a string containing the elements in the array and subscript | |
830 | described by S. If the subscript is * or @, obeys quoting rules akin | |
7117c2d2 | 831 | to the expansion of $* and $@ including double quoting. If RTYPE |
3185942a JA |
832 | is non-null it gets 1 if the array reference is name[*], 2 if the |
833 | reference is name[@], and 0 otherwise. */ | |
f73dda09 | 834 | static char * |
7117c2d2 | 835 | array_value_internal (s, quoted, allow_all, rtype) |
f73dda09 | 836 | char *s; |
7117c2d2 | 837 | int quoted, allow_all, *rtype; |
f73dda09 JA |
838 | { |
839 | int len; | |
840 | arrayind_t ind; | |
3185942a | 841 | char *akey; |
f73dda09 JA |
842 | char *retval, *t, *temp; |
843 | WORD_LIST *l; | |
844 | SHELL_VAR *var; | |
845 | ||
846 | var = array_variable_part (s, &t, &len); | |
847 | ||
7117c2d2 JA |
848 | /* Expand the index, even if the variable doesn't exist, in case side |
849 | effects are needed, like ${w[i++]} where w is unset. */ | |
850 | #if 0 | |
f73dda09 JA |
851 | if (var == 0) |
852 | return (char *)NULL; | |
7117c2d2 | 853 | #endif |
f73dda09 | 854 | |
b80f6443 JA |
855 | if (len == 0) |
856 | return ((char *)NULL); /* error message already printed */ | |
857 | ||
f73dda09 JA |
858 | /* [ */ |
859 | if (ALL_ELEMENT_SUB (t[0]) && t[1] == ']') | |
860 | { | |
7117c2d2 | 861 | if (rtype) |
f1be666c | 862 | *rtype = (t[0] == '*') ? 1 : 2; |
f73dda09 JA |
863 | if (allow_all == 0) |
864 | { | |
7117c2d2 | 865 | err_badarraysub (s); |
f73dda09 JA |
866 | return ((char *)NULL); |
867 | } | |
95732b49 | 868 | else if (var == 0 || value_cell (var) == 0) |
7117c2d2 | 869 | return ((char *)NULL); |
3185942a | 870 | else if (array_p (var) == 0 && assoc_p (var) == 0) |
7117c2d2 | 871 | l = add_string_to_list (value_cell (var), (WORD_LIST *)NULL); |
3185942a JA |
872 | else if (assoc_p (var)) |
873 | { | |
874 | l = assoc_to_word_list (assoc_cell (var)); | |
875 | if (l == (WORD_LIST *)NULL) | |
876 | return ((char *)NULL); | |
877 | } | |
f73dda09 JA |
878 | else |
879 | { | |
880 | l = array_to_word_list (array_cell (var)); | |
881 | if (l == (WORD_LIST *)NULL) | |
882 | return ((char *) NULL); | |
883 | } | |
884 | ||
885 | if (t[0] == '*' && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) | |
886 | { | |
887 | temp = string_list_dollar_star (l); | |
888 | retval = quote_string (temp); | |
889 | free (temp); | |
890 | } | |
891 | else /* ${name[@]} or unquoted ${name[*]} */ | |
892 | retval = string_list_dollar_at (l, quoted); | |
893 | ||
894 | dispose_words (l); | |
895 | } | |
896 | else | |
897 | { | |
7117c2d2 JA |
898 | if (rtype) |
899 | *rtype = 0; | |
3185942a | 900 | if (var == 0 || array_p (var) || assoc_p (var) == 0) |
f73dda09 | 901 | { |
3185942a JA |
902 | ind = array_expand_index (t, len); |
903 | if (ind < 0) | |
7117c2d2 | 904 | { |
3185942a JA |
905 | index_error: |
906 | if (var) | |
907 | err_badarraysub (var->name); | |
908 | else | |
909 | { | |
910 | t[-1] = '\0'; | |
911 | err_badarraysub (s); | |
912 | t[-1] = '['; /* ] */ | |
913 | } | |
914 | return ((char *)NULL); | |
7117c2d2 | 915 | } |
f73dda09 | 916 | } |
3185942a JA |
917 | else if (assoc_p (var)) |
918 | { | |
919 | t[len - 1] = '\0'; | |
920 | akey = expand_assignment_string_to_string (t, 0); /* [ */ | |
921 | t[len - 1] = ']'; | |
922 | if (akey == 0 || *akey == 0) | |
923 | goto index_error; | |
924 | } | |
925 | ||
7117c2d2 JA |
926 | if (var == 0) |
927 | return ((char *)NULL); | |
3185942a | 928 | if (array_p (var) == 0 && assoc_p (var) == 0) |
7117c2d2 | 929 | return (ind == 0 ? value_cell (var) : (char *)NULL); |
3185942a JA |
930 | else if (assoc_p (var)) |
931 | retval = assoc_reference (assoc_cell (var), akey); | |
932 | else | |
933 | retval = array_reference (array_cell (var), ind); | |
f73dda09 JA |
934 | } |
935 | ||
936 | return retval; | |
937 | } | |
938 | ||
939 | /* Return a string containing the elements described by the array and | |
940 | subscript contained in S, obeying quoting for subscripts * and @. */ | |
941 | char * | |
7117c2d2 | 942 | array_value (s, quoted, rtype) |
f73dda09 | 943 | char *s; |
7117c2d2 | 944 | int quoted, *rtype; |
f73dda09 | 945 | { |
7117c2d2 | 946 | return (array_value_internal (s, quoted, 1, rtype)); |
f73dda09 JA |
947 | } |
948 | ||
949 | /* Return the value of the array indexing expression S as a single string. | |
950 | If ALLOW_ALL is 0, do not allow `@' and `*' subscripts. This is used | |
951 | by other parts of the shell such as the arithmetic expression evaluator | |
952 | in expr.c. */ | |
953 | char * | |
7117c2d2 | 954 | get_array_value (s, allow_all, rtype) |
f73dda09 | 955 | char *s; |
7117c2d2 | 956 | int allow_all, *rtype; |
f73dda09 | 957 | { |
7117c2d2 | 958 | return (array_value_internal (s, 0, allow_all, rtype)); |
f73dda09 JA |
959 | } |
960 | ||
b80f6443 JA |
961 | char * |
962 | array_keys (s, quoted) | |
963 | char *s; | |
964 | int quoted; | |
965 | { | |
966 | int len; | |
967 | char *retval, *t, *temp; | |
968 | WORD_LIST *l; | |
969 | SHELL_VAR *var; | |
970 | ||
971 | var = array_variable_part (s, &t, &len); | |
972 | ||
973 | /* [ */ | |
974 | if (var == 0 || ALL_ELEMENT_SUB (t[0]) == 0 || t[1] != ']') | |
975 | return (char *)NULL; | |
976 | ||
3185942a | 977 | if (array_p (var) == 0 && assoc_p (var) == 0) |
b80f6443 | 978 | l = add_string_to_list ("0", (WORD_LIST *)NULL); |
3185942a JA |
979 | else if (assoc_p (var)) |
980 | l = assoc_keys_to_word_list (assoc_cell (var)); | |
b80f6443 | 981 | else |
3185942a JA |
982 | l = array_keys_to_word_list (array_cell (var)); |
983 | if (l == (WORD_LIST *)NULL) | |
984 | return ((char *) NULL); | |
b80f6443 JA |
985 | |
986 | if (t[0] == '*' && (quoted & (Q_HERE_DOCUMENT|Q_DOUBLE_QUOTES))) | |
987 | { | |
988 | temp = string_list_dollar_star (l); | |
989 | retval = quote_string (temp); | |
990 | free (temp); | |
991 | } | |
992 | else /* ${!name[@]} or unquoted ${!name[*]} */ | |
993 | retval = string_list_dollar_at (l, quoted); | |
994 | ||
995 | dispose_words (l); | |
996 | return retval; | |
997 | } | |
f73dda09 | 998 | #endif /* ARRAY_VARS */ |