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Commit | Line | Data |
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726f6388 JA |
1 | /* general.c -- Stuff that is used by all files. */ |
2 | ||
8868edaf | 3 | /* Copyright (C) 1987-2020 Free Software Foundation, Inc. |
726f6388 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. | |
726f6388 | 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. | |
726f6388 | 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 | */ | |
726f6388 | 20 | |
ccc6cda3 JA |
21 | #include "config.h" |
22 | ||
726f6388 | 23 | #include "bashtypes.h" |
ac50fbac | 24 | #if defined (HAVE_SYS_PARAM_H) |
cce855bc JA |
25 | # include <sys/param.h> |
26 | #endif | |
ccc6cda3 JA |
27 | #include "posixstat.h" |
28 | ||
29 | #if defined (HAVE_UNISTD_H) | |
30 | # include <unistd.h> | |
31 | #endif | |
32 | ||
726f6388 JA |
33 | #include "filecntl.h" |
34 | #include "bashansi.h" | |
ccc6cda3 | 35 | #include <stdio.h> |
f73dda09 | 36 | #include "chartypes.h" |
ccc6cda3 JA |
37 | #include <errno.h> |
38 | ||
b80f6443 JA |
39 | #include "bashintl.h" |
40 | ||
726f6388 | 41 | #include "shell.h" |
d233b485 CR |
42 | #include "parser.h" |
43 | #include "flags.h" | |
44 | #include "findcmd.h" | |
95732b49 | 45 | #include "test.h" |
ac50fbac | 46 | #include "trap.h" |
8868edaf | 47 | #include "pathexp.h" |
95732b49 | 48 | |
d233b485 CR |
49 | #include "builtins/common.h" |
50 | ||
a0c0a00f CR |
51 | #if defined (HAVE_MBSTR_H) && defined (HAVE_MBSCHR) |
52 | # include <mbstr.h> /* mbschr */ | |
53 | #endif | |
54 | ||
726f6388 JA |
55 | #include <tilde/tilde.h> |
56 | ||
726f6388 JA |
57 | #if !defined (errno) |
58 | extern int errno; | |
59 | #endif /* !errno */ | |
60 | ||
d233b485 CR |
61 | #ifdef __CYGWIN__ |
62 | # include <sys/cygwin.h> | |
63 | #endif | |
cce855bc | 64 | |
8868edaf CR |
65 | static char *bash_special_tilde_expansions PARAMS((char *)); |
66 | static int unquoted_tilde_word PARAMS((const char *)); | |
67 | static void initialize_group_array PARAMS((void)); | |
7117c2d2 | 68 | |
cce855bc | 69 | /* A standard error message to use when getcwd() returns NULL. */ |
3185942a | 70 | const char * const bash_getcwd_errstr = N_("getcwd: cannot access parent directories"); |
726f6388 | 71 | |
d233b485 CR |
72 | /* Do whatever is necessary to initialize `Posix mode'. This currently |
73 | modifies the following variables which are controlled via shopt: | |
74 | interactive_comments | |
75 | source_uses_path | |
76 | expand_aliases | |
77 | inherit_errexit | |
78 | print_shift_error | |
8868edaf | 79 | posixglob |
d233b485 CR |
80 | |
81 | and the following variables which cannot be user-modified: | |
82 | ||
83 | source_searches_cwd | |
84 | ||
85 | If we add to the first list, we need to change the table and functions | |
86 | below */ | |
87 | ||
88 | static struct { | |
89 | int *posix_mode_var; | |
90 | } posix_vars[] = | |
91 | { | |
92 | &interactive_comments, | |
93 | &source_uses_path, | |
94 | &expand_aliases, | |
95 | &inherit_errexit, | |
96 | &print_shift_error, | |
97 | 0 | |
98 | }; | |
99 | ||
8868edaf CR |
100 | static char *saved_posix_vars = 0; |
101 | ||
726f6388 | 102 | void |
ccc6cda3 JA |
103 | posix_initialize (on) |
104 | int on; | |
726f6388 | 105 | { |
28ef6c31 JA |
106 | /* Things that should be turned on when posix mode is enabled. */ |
107 | if (on != 0) | |
108 | { | |
109 | interactive_comments = source_uses_path = expand_aliases = 1; | |
a0c0a00f | 110 | inherit_errexit = 1; |
3185942a | 111 | source_searches_cwd = 0; |
d233b485 | 112 | print_shift_error = 1; |
28ef6c31 JA |
113 | } |
114 | ||
115 | /* Things that should be turned on when posix mode is disabled. */ | |
8868edaf CR |
116 | else if (saved_posix_vars) /* on == 0, restore saved settings */ |
117 | { | |
118 | set_posix_options (saved_posix_vars); | |
119 | free (saved_posix_vars); | |
120 | saved_posix_vars = 0; | |
121 | } | |
122 | else /* on == 0, restore a default set of settings */ | |
28ef6c31 JA |
123 | { |
124 | source_searches_cwd = 1; | |
125 | expand_aliases = interactive_shell; | |
d233b485 | 126 | print_shift_error = 0; |
28ef6c31 | 127 | } |
726f6388 JA |
128 | } |
129 | ||
d233b485 CR |
130 | int |
131 | num_posix_options () | |
132 | { | |
133 | return ((sizeof (posix_vars) / sizeof (posix_vars[0])) - 1); | |
134 | } | |
135 | ||
136 | char * | |
137 | get_posix_options (bitmap) | |
138 | char *bitmap; | |
139 | { | |
140 | register int i; | |
141 | ||
142 | if (bitmap == 0) | |
143 | bitmap = (char *)xmalloc (num_posix_options ()); /* no trailing NULL */ | |
144 | for (i = 0; posix_vars[i].posix_mode_var; i++) | |
145 | bitmap[i] = *(posix_vars[i].posix_mode_var); | |
146 | return bitmap; | |
147 | } | |
148 | ||
8868edaf CR |
149 | #undef save_posix_options |
150 | void | |
151 | save_posix_options () | |
152 | { | |
153 | saved_posix_vars = get_posix_options (saved_posix_vars); | |
154 | } | |
155 | ||
d233b485 CR |
156 | void |
157 | set_posix_options (bitmap) | |
158 | const char *bitmap; | |
159 | { | |
160 | register int i; | |
161 | ||
162 | for (i = 0; posix_vars[i].posix_mode_var; i++) | |
163 | *(posix_vars[i].posix_mode_var) = bitmap[i]; | |
164 | } | |
165 | ||
ccc6cda3 JA |
166 | /* **************************************************************** */ |
167 | /* */ | |
168 | /* Functions to convert to and from and display non-standard types */ | |
169 | /* */ | |
170 | /* **************************************************************** */ | |
171 | ||
726f6388 JA |
172 | #if defined (RLIMTYPE) |
173 | RLIMTYPE | |
174 | string_to_rlimtype (s) | |
175 | char *s; | |
176 | { | |
cce855bc JA |
177 | RLIMTYPE ret; |
178 | int neg; | |
726f6388 | 179 | |
cce855bc JA |
180 | ret = 0; |
181 | neg = 0; | |
726f6388 JA |
182 | while (s && *s && whitespace (*s)) |
183 | s++; | |
0001803f | 184 | if (s && (*s == '-' || *s == '+')) |
726f6388 JA |
185 | { |
186 | neg = *s == '-'; | |
187 | s++; | |
188 | } | |
f73dda09 JA |
189 | for ( ; s && *s && DIGIT (*s); s++) |
190 | ret = (ret * 10) + TODIGIT (*s); | |
726f6388 JA |
191 | return (neg ? -ret : ret); |
192 | } | |
193 | ||
194 | void | |
195 | print_rlimtype (n, addnl) | |
196 | RLIMTYPE n; | |
197 | int addnl; | |
198 | { | |
f73dda09 | 199 | char s[INT_STRLEN_BOUND (RLIMTYPE) + 1], *p; |
726f6388 | 200 | |
f73dda09 JA |
201 | p = s + sizeof(s); |
202 | *--p = '\0'; | |
726f6388 JA |
203 | |
204 | if (n < 0) | |
205 | { | |
f73dda09 JA |
206 | do |
207 | *--p = '0' - n % 10; | |
208 | while ((n /= 10) != 0); | |
209 | ||
210 | *--p = '-'; | |
211 | } | |
212 | else | |
213 | { | |
214 | do | |
215 | *--p = '0' + n % 10; | |
216 | while ((n /= 10) != 0); | |
726f6388 JA |
217 | } |
218 | ||
f73dda09 | 219 | printf ("%s%s", p, addnl ? "\n" : ""); |
726f6388 JA |
220 | } |
221 | #endif /* RLIMTYPE */ | |
222 | ||
ccc6cda3 JA |
223 | /* **************************************************************** */ |
224 | /* */ | |
225 | /* Input Validation Functions */ | |
226 | /* */ | |
227 | /* **************************************************************** */ | |
228 | ||
229 | /* Return non-zero if all of the characters in STRING are digits. */ | |
230 | int | |
231 | all_digits (string) | |
a0c0a00f | 232 | const char *string; |
ccc6cda3 | 233 | { |
a0c0a00f | 234 | register const char *s; |
28ef6c31 JA |
235 | |
236 | for (s = string; *s; s++) | |
f73dda09 | 237 | if (DIGIT (*s) == 0) |
28ef6c31 JA |
238 | return (0); |
239 | ||
ccc6cda3 JA |
240 | return (1); |
241 | } | |
242 | ||
243 | /* Return non-zero if the characters pointed to by STRING constitute a | |
244 | valid number. Stuff the converted number into RESULT if RESULT is | |
f73dda09 | 245 | not null. */ |
ccc6cda3 JA |
246 | int |
247 | legal_number (string, result) | |
3185942a | 248 | const char *string; |
7117c2d2 | 249 | intmax_t *result; |
ccc6cda3 | 250 | { |
7117c2d2 | 251 | intmax_t value; |
cce855bc | 252 | char *ep; |
ccc6cda3 JA |
253 | |
254 | if (result) | |
255 | *result = 0; | |
256 | ||
ac50fbac CR |
257 | if (string == 0) |
258 | return 0; | |
259 | ||
f73dda09 | 260 | errno = 0; |
7117c2d2 | 261 | value = strtoimax (string, &ep, 10); |
3185942a | 262 | if (errno || ep == string) |
f73dda09 | 263 | return 0; /* errno is set on overflow or underflow */ |
ccc6cda3 | 264 | |
7117c2d2 | 265 | /* Skip any trailing whitespace, since strtoimax does not. */ |
28ef6c31 JA |
266 | while (whitespace (*ep)) |
267 | ep++; | |
268 | ||
cce855bc JA |
269 | /* If *string is not '\0' but *ep is '\0' on return, the entire string |
270 | is valid. */ | |
ac50fbac | 271 | if (*string && *ep == '\0') |
ccc6cda3 JA |
272 | { |
273 | if (result) | |
cce855bc JA |
274 | *result = value; |
275 | /* The SunOS4 implementation of strtol() will happily ignore | |
276 | overflow conditions, so this cannot do overflow correctly | |
277 | on those systems. */ | |
278 | return 1; | |
ccc6cda3 | 279 | } |
cce855bc JA |
280 | |
281 | return (0); | |
ccc6cda3 JA |
282 | } |
283 | ||
726f6388 JA |
284 | /* Return 1 if this token is a legal shell `identifier'; that is, it consists |
285 | solely of letters, digits, and underscores, and does not begin with a | |
286 | digit. */ | |
287 | int | |
288 | legal_identifier (name) | |
a0c0a00f | 289 | const char *name; |
726f6388 | 290 | { |
a0c0a00f | 291 | register const char *s; |
f73dda09 | 292 | unsigned char c; |
726f6388 | 293 | |
f73dda09 | 294 | if (!name || !(c = *name) || (legal_variable_starter (c) == 0)) |
726f6388 JA |
295 | return (0); |
296 | ||
f73dda09 | 297 | for (s = name + 1; (c = *s) != 0; s++) |
726f6388 | 298 | { |
f73dda09 | 299 | if (legal_variable_char (c) == 0) |
28ef6c31 | 300 | return (0); |
726f6388 JA |
301 | } |
302 | return (1); | |
303 | } | |
304 | ||
a0c0a00f CR |
305 | /* Return 1 if NAME is a valid value that can be assigned to a nameref |
306 | variable. FLAGS can be 2, in which case the name is going to be used | |
307 | to create a variable. Other values are currently unused, but could | |
308 | be used to allow values to be stored and indirectly referenced, but | |
309 | not used in assignments. */ | |
310 | int | |
311 | valid_nameref_value (name, flags) | |
312 | const char *name; | |
313 | int flags; | |
314 | { | |
315 | if (name == 0 || *name == 0) | |
316 | return 0; | |
317 | ||
318 | /* valid identifier */ | |
319 | #if defined (ARRAY_VARS) | |
320 | if (legal_identifier (name) || (flags != 2 && valid_array_reference (name, 0))) | |
321 | #else | |
322 | if (legal_identifier (name)) | |
323 | #endif | |
324 | return 1; | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | int | |
330 | check_selfref (name, value, flags) | |
331 | const char *name; | |
332 | char *value; | |
333 | int flags; | |
334 | { | |
335 | char *t; | |
336 | ||
337 | if (STREQ (name, value)) | |
338 | return 1; | |
339 | ||
340 | #if defined (ARRAY_VARS) | |
341 | if (valid_array_reference (value, 0)) | |
342 | { | |
d233b485 | 343 | t = array_variable_name (value, 0, (char **)NULL, (int *)NULL); |
a0c0a00f CR |
344 | if (t && STREQ (name, t)) |
345 | { | |
346 | free (t); | |
347 | return 1; | |
348 | } | |
349 | free (t); | |
350 | } | |
351 | #endif | |
352 | ||
353 | return 0; /* not a self reference */ | |
354 | } | |
355 | ||
726f6388 | 356 | /* Make sure that WORD is a valid shell identifier, i.e. |
8868edaf CR |
357 | does not contain a dollar sign, nor is quoted in any way. |
358 | If CHECK_WORD is non-zero, | |
726f6388 | 359 | the word is checked to ensure that it consists of only letters, |
8868edaf | 360 | digits, and underscores, and does not consist of all digits. */ |
ccc6cda3 | 361 | int |
726f6388 JA |
362 | check_identifier (word, check_word) |
363 | WORD_DESC *word; | |
364 | int check_word; | |
365 | { | |
8868edaf | 366 | if (word->flags & (W_HASDOLLAR|W_QUOTED)) /* XXX - HASDOLLAR? */ |
726f6388 | 367 | { |
b80f6443 | 368 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
369 | return (0); |
370 | } | |
8868edaf | 371 | else if (check_word && (all_digits (word->word) || legal_identifier (word->word) == 0)) |
726f6388 | 372 | { |
b80f6443 | 373 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
374 | return (0); |
375 | } | |
376 | else | |
377 | return (1); | |
378 | } | |
379 | ||
a0c0a00f CR |
380 | /* Return 1 if STRING is a function name that the shell will import from |
381 | the environment. Currently we reject attempts to import shell functions | |
382 | containing slashes, beginning with newlines or containing blanks. In | |
383 | Posix mode, we require that STRING be a valid shell identifier. Not | |
384 | used yet. */ | |
385 | int | |
386 | importable_function_name (string, len) | |
387 | const char *string; | |
388 | size_t len; | |
389 | { | |
390 | if (absolute_program (string)) /* don't allow slash */ | |
391 | return 0; | |
392 | if (*string == '\n') /* can't start with a newline */ | |
393 | return 0; | |
394 | if (shellblank (*string) || shellblank(string[len-1])) | |
395 | return 0; | |
396 | return (posixly_correct ? legal_identifier (string) : 1); | |
397 | } | |
398 | ||
399 | int | |
400 | exportable_function_name (string) | |
401 | const char *string; | |
402 | { | |
403 | if (absolute_program (string)) | |
404 | return 0; | |
405 | if (mbschr (string, '=') != 0) | |
406 | return 0; | |
407 | return 1; | |
408 | } | |
409 | ||
b80f6443 JA |
410 | /* Return 1 if STRING comprises a valid alias name. The shell accepts |
411 | essentially all characters except those which must be quoted to the | |
412 | parser (which disqualifies them from alias expansion anyway) and `/'. */ | |
413 | int | |
414 | legal_alias_name (string, flags) | |
a0c0a00f | 415 | const char *string; |
b80f6443 JA |
416 | int flags; |
417 | { | |
a0c0a00f | 418 | register const char *s; |
b80f6443 JA |
419 | |
420 | for (s = string; *s; s++) | |
421 | if (shellbreak (*s) || shellxquote (*s) || shellexp (*s) || (*s == '/')) | |
422 | return 0; | |
423 | return 1; | |
424 | } | |
425 | ||
7117c2d2 | 426 | /* Returns non-zero if STRING is an assignment statement. The returned value |
d233b485 | 427 | is the index of the `=' sign. If FLAGS&1 we are expecting a compound assignment |
8868edaf CR |
428 | and require an array subscript before the `=' to denote an assignment |
429 | statement. */ | |
7117c2d2 | 430 | int |
b80f6443 | 431 | assignment (string, flags) |
7117c2d2 | 432 | const char *string; |
b80f6443 | 433 | int flags; |
7117c2d2 JA |
434 | { |
435 | register unsigned char c; | |
436 | register int newi, indx; | |
437 | ||
438 | c = string[indx = 0]; | |
439 | ||
b80f6443 | 440 | #if defined (ARRAY_VARS) |
8868edaf CR |
441 | /* If parser_state includes PST_COMPASSIGN, FLAGS will include 1, so we are |
442 | parsing the contents of a compound assignment. If parser_state includes | |
443 | PST_REPARSE, we are in the middle of an assignment statement and breaking | |
444 | the words between the parens into words and assignment statements, but | |
445 | we don't need to check for that right now. Within a compound assignment, | |
446 | the subscript is required to make the word an assignment statement. If | |
447 | we don't have a subscript, even if the word is a valid assignment | |
448 | statement otherwise, we don't want to treat it as one. */ | |
449 | if ((flags & 1) && c != '[') /* ] */ | |
450 | return (0); | |
451 | else if ((flags & 1) == 0 && legal_variable_starter (c) == 0) | |
b80f6443 | 452 | #else |
7117c2d2 | 453 | if (legal_variable_starter (c) == 0) |
b80f6443 | 454 | #endif |
7117c2d2 JA |
455 | return (0); |
456 | ||
457 | while (c = string[indx]) | |
458 | { | |
459 | /* The following is safe. Note that '=' at the start of a word | |
460 | is not an assignment statement. */ | |
461 | if (c == '=') | |
462 | return (indx); | |
463 | ||
464 | #if defined (ARRAY_VARS) | |
465 | if (c == '[') | |
466 | { | |
d233b485 CR |
467 | newi = skipsubscript (string, indx, (flags & 2) ? 1 : 0); |
468 | /* XXX - why not check for blank subscripts here, if we do in | |
469 | valid_array_reference? */ | |
7117c2d2 JA |
470 | if (string[newi++] != ']') |
471 | return (0); | |
95732b49 JA |
472 | if (string[newi] == '+' && string[newi+1] == '=') |
473 | return (newi + 1); | |
7117c2d2 JA |
474 | return ((string[newi] == '=') ? newi : 0); |
475 | } | |
476 | #endif /* ARRAY_VARS */ | |
477 | ||
95732b49 JA |
478 | /* Check for `+=' */ |
479 | if (c == '+' && string[indx+1] == '=') | |
480 | return (indx + 1); | |
481 | ||
7117c2d2 JA |
482 | /* Variable names in assignment statements may contain only letters, |
483 | digits, and `_'. */ | |
484 | if (legal_variable_char (c) == 0) | |
485 | return (0); | |
486 | ||
487 | indx++; | |
488 | } | |
489 | return (0); | |
490 | } | |
491 | ||
d233b485 CR |
492 | int |
493 | line_isblank (line) | |
494 | const char *line; | |
495 | { | |
496 | register int i; | |
497 | ||
498 | if (line == 0) | |
499 | return 0; /* XXX */ | |
500 | for (i = 0; line[i]; i++) | |
501 | if (isblank ((unsigned char)line[i]) == 0) | |
502 | break; | |
503 | return (line[i] == '\0'); | |
504 | } | |
505 | ||
ccc6cda3 JA |
506 | /* **************************************************************** */ |
507 | /* */ | |
508 | /* Functions to manage files and file descriptors */ | |
509 | /* */ | |
510 | /* **************************************************************** */ | |
511 | ||
726f6388 JA |
512 | /* A function to unset no-delay mode on a file descriptor. Used in shell.c |
513 | to unset it on the fd passed as stdin. Should be called on stdin if | |
514 | readline gets an EAGAIN or EWOULDBLOCK when trying to read input. */ | |
515 | ||
516 | #if !defined (O_NDELAY) | |
517 | # if defined (FNDELAY) | |
518 | # define O_NDELAY FNDELAY | |
519 | # endif | |
520 | #endif /* O_NDELAY */ | |
521 | ||
522 | /* Make sure no-delay mode is not set on file descriptor FD. */ | |
bb70624e | 523 | int |
28ef6c31 | 524 | sh_unset_nodelay_mode (fd) |
726f6388 JA |
525 | int fd; |
526 | { | |
bb70624e | 527 | int flags, bflags; |
726f6388 JA |
528 | |
529 | if ((flags = fcntl (fd, F_GETFL, 0)) < 0) | |
bb70624e | 530 | return -1; |
726f6388 | 531 | |
bb70624e | 532 | bflags = 0; |
ccc6cda3 JA |
533 | |
534 | /* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present | |
535 | and O_NDELAY is defined. */ | |
bb70624e JA |
536 | #ifdef O_NONBLOCK |
537 | bflags |= O_NONBLOCK; | |
538 | #endif | |
539 | ||
540 | #ifdef O_NDELAY | |
541 | bflags |= O_NDELAY; | |
542 | #endif | |
543 | ||
544 | if (flags & bflags) | |
726f6388 | 545 | { |
bb70624e JA |
546 | flags &= ~bflags; |
547 | return (fcntl (fd, F_SETFL, flags)); | |
726f6388 | 548 | } |
726f6388 | 549 | |
bb70624e | 550 | return 0; |
726f6388 JA |
551 | } |
552 | ||
d233b485 CR |
553 | /* Just a wrapper for the define in include/filecntl.h */ |
554 | int | |
555 | sh_setclexec (fd) | |
556 | int fd; | |
557 | { | |
558 | return (SET_CLOSE_ON_EXEC (fd)); | |
559 | } | |
560 | ||
7117c2d2 JA |
561 | /* Return 1 if file descriptor FD is valid; 0 otherwise. */ |
562 | int | |
563 | sh_validfd (fd) | |
564 | int fd; | |
565 | { | |
566 | return (fcntl (fd, F_GETFD, 0) >= 0); | |
567 | } | |
568 | ||
495aee44 CR |
569 | int |
570 | fd_ispipe (fd) | |
571 | int fd; | |
572 | { | |
573 | errno = 0; | |
a0c0a00f | 574 | return ((lseek (fd, 0L, SEEK_CUR) < 0) && (errno == ESPIPE)); |
495aee44 CR |
575 | } |
576 | ||
b72432fd JA |
577 | /* There is a bug in the NeXT 2.1 rlogind that causes opens |
578 | of /dev/tty to fail. */ | |
579 | ||
580 | #if defined (__BEOS__) | |
581 | /* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it | |
582 | into a no-op. This should probably go away in the future. */ | |
583 | # undef O_NONBLOCK | |
584 | # define O_NONBLOCK 0 | |
585 | #endif /* __BEOS__ */ | |
586 | ||
726f6388 | 587 | void |
ccc6cda3 | 588 | check_dev_tty () |
726f6388 | 589 | { |
ccc6cda3 JA |
590 | int tty_fd; |
591 | char *tty; | |
726f6388 | 592 | |
d166f048 | 593 | tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK); |
726f6388 | 594 | |
ccc6cda3 | 595 | if (tty_fd < 0) |
726f6388 | 596 | { |
ccc6cda3 JA |
597 | tty = (char *)ttyname (fileno (stdin)); |
598 | if (tty == 0) | |
599 | return; | |
d166f048 | 600 | tty_fd = open (tty, O_RDWR|O_NONBLOCK); |
726f6388 | 601 | } |
ac50fbac CR |
602 | if (tty_fd >= 0) |
603 | close (tty_fd); | |
726f6388 JA |
604 | } |
605 | ||
ccc6cda3 JA |
606 | /* Return 1 if PATH1 and PATH2 are the same file. This is kind of |
607 | expensive. If non-NULL STP1 and STP2 point to stat structures | |
608 | corresponding to PATH1 and PATH2, respectively. */ | |
726f6388 | 609 | int |
ccc6cda3 | 610 | same_file (path1, path2, stp1, stp2) |
a0c0a00f | 611 | const char *path1, *path2; |
ccc6cda3 | 612 | struct stat *stp1, *stp2; |
726f6388 | 613 | { |
ccc6cda3 | 614 | struct stat st1, st2; |
726f6388 | 615 | |
ccc6cda3 | 616 | if (stp1 == NULL) |
726f6388 | 617 | { |
ccc6cda3 JA |
618 | if (stat (path1, &st1) != 0) |
619 | return (0); | |
620 | stp1 = &st1; | |
726f6388 | 621 | } |
726f6388 | 622 | |
ccc6cda3 JA |
623 | if (stp2 == NULL) |
624 | { | |
625 | if (stat (path2, &st2) != 0) | |
626 | return (0); | |
627 | stp2 = &st2; | |
628 | } | |
726f6388 | 629 | |
ccc6cda3 | 630 | return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino)); |
726f6388 JA |
631 | } |
632 | ||
ccc6cda3 JA |
633 | /* Move FD to a number close to the maximum number of file descriptors |
634 | allowed in the shell process, to avoid the user stepping on it with | |
635 | redirection and causing us extra work. If CHECK_NEW is non-zero, | |
636 | we check whether or not the file descriptors are in use before | |
d166f048 JA |
637 | duplicating FD onto them. MAXFD says where to start checking the |
638 | file descriptors. If it's less than 20, we get the maximum value | |
639 | available from getdtablesize(2). */ | |
726f6388 | 640 | int |
d166f048 JA |
641 | move_to_high_fd (fd, check_new, maxfd) |
642 | int fd, check_new, maxfd; | |
726f6388 | 643 | { |
ccc6cda3 | 644 | int script_fd, nfds, ignore; |
726f6388 | 645 | |
d166f048 JA |
646 | if (maxfd < 20) |
647 | { | |
648 | nfds = getdtablesize (); | |
649 | if (nfds <= 0) | |
650 | nfds = 20; | |
7117c2d2 JA |
651 | if (nfds > HIGH_FD_MAX) |
652 | nfds = HIGH_FD_MAX; /* reasonable maximum */ | |
d166f048 JA |
653 | } |
654 | else | |
655 | nfds = maxfd; | |
726f6388 | 656 | |
ccc6cda3 JA |
657 | for (nfds--; check_new && nfds > 3; nfds--) |
658 | if (fcntl (nfds, F_GETFD, &ignore) == -1) | |
659 | break; | |
726f6388 | 660 | |
7117c2d2 | 661 | if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1) |
ccc6cda3 JA |
662 | { |
663 | if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */ | |
664 | close (fd); | |
665 | return (script_fd); | |
666 | } | |
726f6388 | 667 | |
7117c2d2 JA |
668 | /* OK, we didn't find one less than our artificial maximum; return the |
669 | original file descriptor. */ | |
ccc6cda3 JA |
670 | return (fd); |
671 | } | |
672 | ||
673 | /* Return non-zero if the characters from SAMPLE are not all valid | |
674 | characters to be found in the first line of a shell script. We | |
675 | check up to the first newline, or SAMPLE_LEN, whichever comes first. | |
676 | All of the characters must be printable or whitespace. */ | |
726f6388 | 677 | |
726f6388 | 678 | int |
ccc6cda3 | 679 | check_binary_file (sample, sample_len) |
a0c0a00f | 680 | const char *sample; |
ccc6cda3 | 681 | int sample_len; |
726f6388 | 682 | { |
ccc6cda3 | 683 | register int i; |
f73dda09 | 684 | unsigned char c; |
726f6388 | 685 | |
ccc6cda3 JA |
686 | for (i = 0; i < sample_len; i++) |
687 | { | |
f73dda09 JA |
688 | c = sample[i]; |
689 | if (c == '\n') | |
ccc6cda3 | 690 | return (0); |
0628567a | 691 | if (c == '\0') |
ccc6cda3 JA |
692 | return (1); |
693 | } | |
726f6388 | 694 | |
ccc6cda3 | 695 | return (0); |
726f6388 JA |
696 | } |
697 | ||
3185942a JA |
698 | /* **************************************************************** */ |
699 | /* */ | |
700 | /* Functions to manipulate pipes */ | |
701 | /* */ | |
702 | /* **************************************************************** */ | |
703 | ||
704 | int | |
705 | sh_openpipe (pv) | |
706 | int *pv; | |
707 | { | |
708 | int r; | |
709 | ||
710 | if ((r = pipe (pv)) < 0) | |
711 | return r; | |
712 | ||
713 | pv[0] = move_to_high_fd (pv[0], 1, 64); | |
714 | pv[1] = move_to_high_fd (pv[1], 1, 64); | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | int | |
720 | sh_closepipe (pv) | |
721 | int *pv; | |
722 | { | |
723 | if (pv[0] >= 0) | |
724 | close (pv[0]); | |
725 | ||
726 | if (pv[1] >= 0) | |
727 | close (pv[1]); | |
728 | ||
729 | pv[0] = pv[1] = -1; | |
730 | return 0; | |
731 | } | |
732 | ||
b80f6443 JA |
733 | /* **************************************************************** */ |
734 | /* */ | |
735 | /* Functions to inspect pathnames */ | |
736 | /* */ | |
737 | /* **************************************************************** */ | |
738 | ||
3185942a JA |
739 | int |
740 | file_exists (fn) | |
a0c0a00f | 741 | const char *fn; |
3185942a JA |
742 | { |
743 | struct stat sb; | |
744 | ||
745 | return (stat (fn, &sb) == 0); | |
746 | } | |
747 | ||
b80f6443 JA |
748 | int |
749 | file_isdir (fn) | |
a0c0a00f | 750 | const char *fn; |
b80f6443 JA |
751 | { |
752 | struct stat sb; | |
753 | ||
754 | return ((stat (fn, &sb) == 0) && S_ISDIR (sb.st_mode)); | |
755 | } | |
756 | ||
757 | int | |
758 | file_iswdir (fn) | |
a0c0a00f | 759 | const char *fn; |
b80f6443 | 760 | { |
0628567a | 761 | return (file_isdir (fn) && sh_eaccess (fn, W_OK) == 0); |
b80f6443 JA |
762 | } |
763 | ||
495aee44 CR |
764 | /* Return 1 if STRING is "." or "..", optionally followed by a directory |
765 | separator */ | |
766 | int | |
ac50fbac | 767 | path_dot_or_dotdot (string) |
495aee44 CR |
768 | const char *string; |
769 | { | |
770 | if (string == 0 || *string == '\0' || *string != '.') | |
771 | return (0); | |
772 | ||
773 | /* string[0] == '.' */ | |
774 | if (PATHSEP(string[1]) || (string[1] == '.' && PATHSEP(string[2]))) | |
775 | return (1); | |
776 | ||
777 | return (0); | |
778 | } | |
779 | ||
95732b49 JA |
780 | /* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd' |
781 | to decide whether or not to look up a directory name in $CDPATH. */ | |
782 | int | |
783 | absolute_pathname (string) | |
784 | const char *string; | |
785 | { | |
786 | if (string == 0 || *string == '\0') | |
787 | return (0); | |
788 | ||
789 | if (ABSPATH(string)) | |
790 | return (1); | |
791 | ||
792 | if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */ | |
793 | return (1); | |
794 | ||
795 | if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */ | |
796 | return (1); | |
797 | ||
798 | return (0); | |
799 | } | |
800 | ||
801 | /* Return 1 if STRING is an absolute program name; it is absolute if it | |
802 | contains any slashes. This is used to decide whether or not to look | |
803 | up through $PATH. */ | |
804 | int | |
805 | absolute_program (string) | |
806 | const char *string; | |
807 | { | |
0001803f | 808 | return ((char *)mbschr (string, '/') != (char *)NULL); |
95732b49 | 809 | } |
b80f6443 | 810 | |
ccc6cda3 JA |
811 | /* **************************************************************** */ |
812 | /* */ | |
813 | /* Functions to manipulate pathnames */ | |
814 | /* */ | |
815 | /* **************************************************************** */ | |
726f6388 | 816 | |
726f6388 JA |
817 | /* Turn STRING (a pathname) into an absolute pathname, assuming that |
818 | DOT_PATH contains the symbolic location of `.'. This always | |
819 | returns a new string, even if STRING was an absolute pathname to | |
820 | begin with. */ | |
821 | char * | |
822 | make_absolute (string, dot_path) | |
a0c0a00f | 823 | const char *string, *dot_path; |
726f6388 JA |
824 | { |
825 | char *result; | |
ccc6cda3 | 826 | |
28ef6c31 | 827 | if (dot_path == 0 || ABSPATH(string)) |
b80f6443 JA |
828 | #ifdef __CYGWIN__ |
829 | { | |
830 | char pathbuf[PATH_MAX + 1]; | |
831 | ||
d233b485 CR |
832 | /* WAS cygwin_conv_to_full_posix_path (string, pathbuf); */ |
833 | cygwin_conv_path (CCP_WIN_A_TO_POSIX, string, pathbuf, PATH_MAX); | |
b80f6443 JA |
834 | result = savestring (pathbuf); |
835 | } | |
836 | #else | |
726f6388 | 837 | result = savestring (string); |
b80f6443 | 838 | #endif |
726f6388 | 839 | else |
bb70624e | 840 | result = sh_makepath (dot_path, string, 0); |
726f6388 JA |
841 | |
842 | return (result); | |
843 | } | |
844 | ||
726f6388 | 845 | /* Return the `basename' of the pathname in STRING (the stuff after the |
95732b49 | 846 | last '/'). If STRING is `/', just return it. */ |
726f6388 JA |
847 | char * |
848 | base_pathname (string) | |
849 | char *string; | |
850 | { | |
851 | char *p; | |
852 | ||
95732b49 | 853 | #if 0 |
28ef6c31 | 854 | if (absolute_pathname (string) == 0) |
726f6388 | 855 | return (string); |
95732b49 JA |
856 | #endif |
857 | ||
858 | if (string[0] == '/' && string[1] == 0) | |
859 | return (string); | |
726f6388 JA |
860 | |
861 | p = (char *)strrchr (string, '/'); | |
ccc6cda3 | 862 | return (p ? ++p : string); |
726f6388 JA |
863 | } |
864 | ||
865 | /* Return the full pathname of FILE. Easy. Filenames that begin | |
866 | with a '/' are returned as themselves. Other filenames have | |
867 | the current working directory prepended. A new string is | |
868 | returned in either case. */ | |
869 | char * | |
870 | full_pathname (file) | |
871 | char *file; | |
872 | { | |
bb70624e | 873 | char *ret; |
726f6388 | 874 | |
7117c2d2 | 875 | file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file); |
726f6388 | 876 | |
28ef6c31 | 877 | if (ABSPATH(file)) |
726f6388 JA |
878 | return (file); |
879 | ||
bb70624e JA |
880 | ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT)); |
881 | free (file); | |
726f6388 | 882 | |
bb70624e | 883 | return (ret); |
726f6388 | 884 | } |
726f6388 JA |
885 | |
886 | /* A slightly related function. Get the prettiest name of this | |
887 | directory possible. */ | |
ccc6cda3 | 888 | static char tdir[PATH_MAX]; |
726f6388 JA |
889 | |
890 | /* Return a pretty pathname. If the first part of the pathname is | |
891 | the same as $HOME, then replace that with `~'. */ | |
892 | char * | |
893 | polite_directory_format (name) | |
894 | char *name; | |
895 | { | |
ccc6cda3 JA |
896 | char *home; |
897 | int l; | |
726f6388 | 898 | |
ccc6cda3 JA |
899 | home = get_string_value ("HOME"); |
900 | l = home ? strlen (home) : 0; | |
726f6388 JA |
901 | if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/')) |
902 | { | |
e8ce775d | 903 | strncpy (tdir + 1, name + l, sizeof(tdir) - 2); |
726f6388 | 904 | tdir[0] = '~'; |
e8ce775d | 905 | tdir[sizeof(tdir) - 1] = '\0'; |
726f6388 JA |
906 | return (tdir); |
907 | } | |
908 | else | |
909 | return (name); | |
910 | } | |
911 | ||
3185942a JA |
912 | /* Trim NAME. If NAME begins with `~/', skip over tilde prefix. Trim to |
913 | keep any tilde prefix and PROMPT_DIRTRIM trailing directory components | |
914 | and replace the intervening characters with `...' */ | |
915 | char * | |
916 | trim_pathname (name, maxlen) | |
917 | char *name; | |
918 | int maxlen; | |
919 | { | |
920 | int nlen, ndirs; | |
921 | intmax_t nskip; | |
922 | char *nbeg, *nend, *ntail, *v; | |
923 | ||
924 | if (name == 0 || (nlen = strlen (name)) == 0) | |
925 | return name; | |
926 | nend = name + nlen; | |
927 | ||
928 | v = get_string_value ("PROMPT_DIRTRIM"); | |
929 | if (v == 0 || *v == 0) | |
930 | return name; | |
931 | if (legal_number (v, &nskip) == 0 || nskip <= 0) | |
932 | return name; | |
933 | ||
934 | /* Skip over tilde prefix */ | |
935 | nbeg = name; | |
936 | if (name[0] == '~') | |
937 | for (nbeg = name; *nbeg; nbeg++) | |
938 | if (*nbeg == '/') | |
939 | { | |
940 | nbeg++; | |
941 | break; | |
942 | } | |
943 | if (*nbeg == 0) | |
944 | return name; | |
945 | ||
946 | for (ndirs = 0, ntail = nbeg; *ntail; ntail++) | |
947 | if (*ntail == '/') | |
948 | ndirs++; | |
0001803f | 949 | if (ndirs < nskip) |
3185942a JA |
950 | return name; |
951 | ||
952 | for (ntail = (*nend == '/') ? nend : nend - 1; ntail > nbeg; ntail--) | |
953 | { | |
954 | if (*ntail == '/') | |
955 | nskip--; | |
956 | if (nskip == 0) | |
957 | break; | |
958 | } | |
959 | if (ntail == nbeg) | |
960 | return name; | |
961 | ||
962 | /* Now we want to return name[0..nbeg]+"..."+ntail, modifying name in place */ | |
963 | nlen = ntail - nbeg; | |
964 | if (nlen <= 3) | |
965 | return name; | |
966 | ||
967 | *nbeg++ = '.'; | |
968 | *nbeg++ = '.'; | |
969 | *nbeg++ = '.'; | |
970 | ||
971 | nlen = nend - ntail; | |
ac50fbac | 972 | memmove (nbeg, ntail, nlen); |
3185942a JA |
973 | nbeg[nlen] = '\0'; |
974 | ||
975 | return name; | |
976 | } | |
977 | ||
a0c0a00f CR |
978 | /* Return a printable representation of FN without special characters. The |
979 | caller is responsible for freeing memory if this returns something other | |
980 | than its argument. If FLAGS is non-zero, we are printing for portable | |
981 | re-input and should single-quote filenames appropriately. */ | |
982 | char * | |
983 | printable_filename (fn, flags) | |
984 | char *fn; | |
985 | int flags; | |
986 | { | |
987 | char *newf; | |
988 | ||
989 | if (ansic_shouldquote (fn)) | |
990 | newf = ansic_quote (fn, 0, NULL); | |
991 | else if (flags && sh_contains_shell_metas (fn)) | |
992 | newf = sh_single_quote (fn); | |
993 | else | |
994 | newf = fn; | |
995 | ||
996 | return newf; | |
997 | } | |
998 | ||
ccc6cda3 JA |
999 | /* Given a string containing units of information separated by colons, |
1000 | return the next one pointed to by (P_INDEX), or NULL if there are no more. | |
1001 | Advance (P_INDEX) to the character after the colon. */ | |
1002 | char * | |
1003 | extract_colon_unit (string, p_index) | |
1004 | char *string; | |
1005 | int *p_index; | |
726f6388 | 1006 | { |
ccc6cda3 JA |
1007 | int i, start, len; |
1008 | char *value; | |
726f6388 | 1009 | |
ccc6cda3 JA |
1010 | if (string == 0) |
1011 | return (string); | |
726f6388 | 1012 | |
ccc6cda3 JA |
1013 | len = strlen (string); |
1014 | if (*p_index >= len) | |
1015 | return ((char *)NULL); | |
726f6388 | 1016 | |
ccc6cda3 | 1017 | i = *p_index; |
726f6388 | 1018 | |
ccc6cda3 JA |
1019 | /* Each call to this routine leaves the index pointing at a colon if |
1020 | there is more to the path. If I is > 0, then increment past the | |
1021 | `:'. If I is 0, then the path has a leading colon. Trailing colons | |
1022 | are handled OK by the `else' part of the if statement; an empty | |
1023 | string is returned in that case. */ | |
1024 | if (i && string[i] == ':') | |
1025 | i++; | |
1026 | ||
1027 | for (start = i; string[i] && string[i] != ':'; i++) | |
1028 | ; | |
1029 | ||
1030 | *p_index = i; | |
1031 | ||
1032 | if (i == start) | |
1033 | { | |
1034 | if (string[i]) | |
1035 | (*p_index)++; | |
1036 | /* Return "" in the case of a trailing `:'. */ | |
f73dda09 | 1037 | value = (char *)xmalloc (1); |
ccc6cda3 JA |
1038 | value[0] = '\0'; |
1039 | } | |
1040 | else | |
bb70624e | 1041 | value = substring (string, start, i); |
ccc6cda3 JA |
1042 | |
1043 | return (value); | |
726f6388 | 1044 | } |
726f6388 JA |
1045 | |
1046 | /* **************************************************************** */ | |
1047 | /* */ | |
1048 | /* Tilde Initialization and Expansion */ | |
1049 | /* */ | |
1050 | /* **************************************************************** */ | |
1051 | ||
cce855bc | 1052 | #if defined (PUSHD_AND_POPD) |
8868edaf | 1053 | extern char *get_dirstack_from_string PARAMS((char *)); |
cce855bc JA |
1054 | #endif |
1055 | ||
f73dda09 | 1056 | static char **bash_tilde_prefixes; |
95732b49 | 1057 | static char **bash_tilde_prefixes2; |
f73dda09 | 1058 | static char **bash_tilde_suffixes; |
95732b49 | 1059 | static char **bash_tilde_suffixes2; |
f73dda09 | 1060 | |
726f6388 JA |
1061 | /* If tilde_expand hasn't been able to expand the text, perhaps it |
1062 | is a special shell expansion. This function is installed as the | |
cce855bc JA |
1063 | tilde_expansion_preexpansion_hook. It knows how to expand ~- and ~+. |
1064 | If PUSHD_AND_POPD is defined, ~[+-]N expands to directories from the | |
1065 | directory stack. */ | |
726f6388 | 1066 | static char * |
d166f048 | 1067 | bash_special_tilde_expansions (text) |
726f6388 JA |
1068 | char *text; |
1069 | { | |
ccc6cda3 | 1070 | char *result; |
726f6388 | 1071 | |
ccc6cda3 | 1072 | result = (char *)NULL; |
cce855bc JA |
1073 | |
1074 | if (text[0] == '+' && text[1] == '\0') | |
1075 | result = get_string_value ("PWD"); | |
1076 | else if (text[0] == '-' && text[1] == '\0') | |
1077 | result = get_string_value ("OLDPWD"); | |
1078 | #if defined (PUSHD_AND_POPD) | |
f73dda09 | 1079 | else if (DIGIT (*text) || ((*text == '+' || *text == '-') && DIGIT (text[1]))) |
cce855bc JA |
1080 | result = get_dirstack_from_string (text); |
1081 | #endif | |
726f6388 | 1082 | |
ccc6cda3 | 1083 | return (result ? savestring (result) : (char *)NULL); |
726f6388 JA |
1084 | } |
1085 | ||
1086 | /* Initialize the tilde expander. In Bash, we handle `~-' and `~+', as | |
1087 | well as handling special tilde prefixes; `:~" and `=~' are indications | |
1088 | that we should do tilde expansion. */ | |
1089 | void | |
1090 | tilde_initialize () | |
1091 | { | |
1092 | static int times_called = 0; | |
1093 | ||
d166f048 | 1094 | /* Tell the tilde expander that we want a crack first. */ |
f73dda09 | 1095 | tilde_expansion_preexpansion_hook = bash_special_tilde_expansions; |
726f6388 JA |
1096 | |
1097 | /* Tell the tilde expander about special strings which start a tilde | |
1098 | expansion, and the special strings that end one. Only do this once. | |
1099 | tilde_initialize () is called from within bashline_reinitialize (). */ | |
cce855bc | 1100 | if (times_called++ == 0) |
726f6388 | 1101 | { |
7117c2d2 | 1102 | bash_tilde_prefixes = strvec_create (3); |
f73dda09 JA |
1103 | bash_tilde_prefixes[0] = "=~"; |
1104 | bash_tilde_prefixes[1] = ":~"; | |
1105 | bash_tilde_prefixes[2] = (char *)NULL; | |
1106 | ||
95732b49 JA |
1107 | bash_tilde_prefixes2 = strvec_create (2); |
1108 | bash_tilde_prefixes2[0] = ":~"; | |
1109 | bash_tilde_prefixes2[1] = (char *)NULL; | |
1110 | ||
f73dda09 JA |
1111 | tilde_additional_prefixes = bash_tilde_prefixes; |
1112 | ||
7117c2d2 | 1113 | bash_tilde_suffixes = strvec_create (3); |
f73dda09 JA |
1114 | bash_tilde_suffixes[0] = ":"; |
1115 | bash_tilde_suffixes[1] = "=~"; /* XXX - ?? */ | |
1116 | bash_tilde_suffixes[2] = (char *)NULL; | |
1117 | ||
1118 | tilde_additional_suffixes = bash_tilde_suffixes; | |
95732b49 JA |
1119 | |
1120 | bash_tilde_suffixes2 = strvec_create (2); | |
1121 | bash_tilde_suffixes2[0] = ":"; | |
1122 | bash_tilde_suffixes2[1] = (char *)NULL; | |
726f6388 | 1123 | } |
726f6388 JA |
1124 | } |
1125 | ||
f73dda09 JA |
1126 | /* POSIX.2, 3.6.1: A tilde-prefix consists of an unquoted tilde character |
1127 | at the beginning of the word, followed by all of the characters preceding | |
1128 | the first unquoted slash in the word, or all the characters in the word | |
1129 | if there is no slash...If none of the characters in the tilde-prefix are | |
1130 | quoted, the characters in the tilde-prefix following the tilde shell be | |
1131 | treated as a possible login name. */ | |
1132 | ||
1133 | #define TILDE_END(c) ((c) == '\0' || (c) == '/' || (c) == ':') | |
1134 | ||
1135 | static int | |
1136 | unquoted_tilde_word (s) | |
1137 | const char *s; | |
1138 | { | |
1139 | const char *r; | |
1140 | ||
1141 | for (r = s; TILDE_END(*r) == 0; r++) | |
1142 | { | |
1143 | switch (*r) | |
1144 | { | |
1145 | case '\\': | |
1146 | case '\'': | |
1147 | case '"': | |
1148 | return 0; | |
1149 | } | |
1150 | } | |
1151 | return 1; | |
1152 | } | |
1153 | ||
95732b49 JA |
1154 | /* Find the end of the tilde-prefix starting at S, and return the tilde |
1155 | prefix in newly-allocated memory. Return the length of the string in | |
1156 | *LENP. FLAGS tells whether or not we're in an assignment context -- | |
1157 | if so, `:' delimits the end of the tilde prefix as well. */ | |
1158 | char * | |
1159 | bash_tilde_find_word (s, flags, lenp) | |
1160 | const char *s; | |
1161 | int flags, *lenp; | |
1162 | { | |
1163 | const char *r; | |
1164 | char *ret; | |
1165 | int l; | |
1166 | ||
1167 | for (r = s; *r && *r != '/'; r++) | |
1168 | { | |
1169 | /* Short-circuit immediately if we see a quote character. Even though | |
1170 | POSIX says that `the first unquoted slash' (or `:') terminates the | |
1171 | tilde-prefix, in practice, any quoted portion of the tilde prefix | |
1172 | will cause it to not be expanded. */ | |
1173 | if (*r == '\\' || *r == '\'' || *r == '"') | |
1174 | { | |
1175 | ret = savestring (s); | |
1176 | if (lenp) | |
1177 | *lenp = 0; | |
1178 | return ret; | |
1179 | } | |
1180 | else if (flags && *r == ':') | |
1181 | break; | |
1182 | } | |
1183 | l = r - s; | |
1184 | ret = xmalloc (l + 1); | |
1185 | strncpy (ret, s, l); | |
1186 | ret[l] = '\0'; | |
1187 | if (lenp) | |
1188 | *lenp = l; | |
1189 | return ret; | |
1190 | } | |
1191 | ||
7117c2d2 JA |
1192 | /* Tilde-expand S by running it through the tilde expansion library. |
1193 | ASSIGN_P is 1 if this is a variable assignment, so the alternate | |
95732b49 JA |
1194 | tilde prefixes should be enabled (`=~' and `:~', see above). If |
1195 | ASSIGN_P is 2, we are expanding the rhs of an assignment statement, | |
1196 | so `=~' is not valid. */ | |
ccc6cda3 | 1197 | char * |
7117c2d2 | 1198 | bash_tilde_expand (s, assign_p) |
f73dda09 | 1199 | const char *s; |
7117c2d2 | 1200 | int assign_p; |
726f6388 | 1201 | { |
8868edaf | 1202 | int r; |
ccc6cda3 | 1203 | char *ret; |
726f6388 | 1204 | |
95732b49 JA |
1205 | tilde_additional_prefixes = assign_p == 0 ? (char **)0 |
1206 | : (assign_p == 2 ? bash_tilde_prefixes2 : bash_tilde_prefixes); | |
1207 | if (assign_p == 2) | |
1208 | tilde_additional_suffixes = bash_tilde_suffixes2; | |
1209 | ||
f73dda09 JA |
1210 | r = (*s == '~') ? unquoted_tilde_word (s) : 1; |
1211 | ret = r ? tilde_expand (s) : savestring (s); | |
ac50fbac | 1212 | |
ac50fbac CR |
1213 | QUIT; |
1214 | ||
ccc6cda3 | 1215 | return (ret); |
726f6388 | 1216 | } |
d166f048 JA |
1217 | |
1218 | /* **************************************************************** */ | |
1219 | /* */ | |
1220 | /* Functions to manipulate and search the group list */ | |
1221 | /* */ | |
1222 | /* **************************************************************** */ | |
1223 | ||
1224 | static int ngroups, maxgroups; | |
1225 | ||
1226 | /* The set of groups that this user is a member of. */ | |
1227 | static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL; | |
1228 | ||
1229 | #if !defined (NOGROUP) | |
1230 | # define NOGROUP (gid_t) -1 | |
1231 | #endif | |
1232 | ||
d166f048 JA |
1233 | static void |
1234 | initialize_group_array () | |
1235 | { | |
1236 | register int i; | |
1237 | ||
1238 | if (maxgroups == 0) | |
1239 | maxgroups = getmaxgroups (); | |
1240 | ||
1241 | ngroups = 0; | |
1242 | group_array = (GETGROUPS_T *)xrealloc (group_array, maxgroups * sizeof (GETGROUPS_T)); | |
1243 | ||
1244 | #if defined (HAVE_GETGROUPS) | |
1245 | ngroups = getgroups (maxgroups, group_array); | |
1246 | #endif | |
1247 | ||
1248 | /* If getgroups returns nothing, or the OS does not support getgroups(), | |
1249 | make sure the groups array includes at least the current gid. */ | |
1250 | if (ngroups == 0) | |
1251 | { | |
1252 | group_array[0] = current_user.gid; | |
1253 | ngroups = 1; | |
1254 | } | |
1255 | ||
1256 | /* If the primary group is not in the groups array, add it as group_array[0] | |
1257 | and shuffle everything else up 1, if there's room. */ | |
1258 | for (i = 0; i < ngroups; i++) | |
1259 | if (current_user.gid == (gid_t)group_array[i]) | |
1260 | break; | |
1261 | if (i == ngroups && ngroups < maxgroups) | |
1262 | { | |
1263 | for (i = ngroups; i > 0; i--) | |
28ef6c31 | 1264 | group_array[i] = group_array[i - 1]; |
d166f048 JA |
1265 | group_array[0] = current_user.gid; |
1266 | ngroups++; | |
1267 | } | |
cce855bc JA |
1268 | |
1269 | /* If the primary group is not group_array[0], swap group_array[0] and | |
1270 | whatever the current group is. The vast majority of systems should | |
1271 | not need this; a notable exception is Linux. */ | |
1272 | if (group_array[0] != current_user.gid) | |
1273 | { | |
1274 | for (i = 0; i < ngroups; i++) | |
28ef6c31 JA |
1275 | if (group_array[i] == current_user.gid) |
1276 | break; | |
cce855bc JA |
1277 | if (i < ngroups) |
1278 | { | |
1279 | group_array[i] = group_array[0]; | |
1280 | group_array[0] = current_user.gid; | |
1281 | } | |
1282 | } | |
d166f048 JA |
1283 | } |
1284 | ||
1285 | /* Return non-zero if GID is one that we have in our groups list. */ | |
1286 | int | |
cce855bc JA |
1287 | #if defined (__STDC__) || defined ( _MINIX) |
1288 | group_member (gid_t gid) | |
1289 | #else | |
d166f048 JA |
1290 | group_member (gid) |
1291 | gid_t gid; | |
cce855bc | 1292 | #endif /* !__STDC__ && !_MINIX */ |
d166f048 JA |
1293 | { |
1294 | #if defined (HAVE_GETGROUPS) | |
1295 | register int i; | |
1296 | #endif | |
1297 | ||
1298 | /* Short-circuit if possible, maybe saving a call to getgroups(). */ | |
1299 | if (gid == current_user.gid || gid == current_user.egid) | |
1300 | return (1); | |
1301 | ||
1302 | #if defined (HAVE_GETGROUPS) | |
1303 | if (ngroups == 0) | |
1304 | initialize_group_array (); | |
1305 | ||
1306 | /* In case of error, the user loses. */ | |
1307 | if (ngroups <= 0) | |
1308 | return (0); | |
1309 | ||
1310 | /* Search through the list looking for GID. */ | |
1311 | for (i = 0; i < ngroups; i++) | |
1312 | if (gid == (gid_t)group_array[i]) | |
1313 | return (1); | |
1314 | #endif | |
1315 | ||
1316 | return (0); | |
1317 | } | |
1318 | ||
1319 | char ** | |
1320 | get_group_list (ngp) | |
1321 | int *ngp; | |
1322 | { | |
1323 | static char **group_vector = (char **)NULL; | |
1324 | register int i; | |
d166f048 JA |
1325 | |
1326 | if (group_vector) | |
1327 | { | |
1328 | if (ngp) | |
1329 | *ngp = ngroups; | |
1330 | return group_vector; | |
1331 | } | |
1332 | ||
1333 | if (ngroups == 0) | |
1334 | initialize_group_array (); | |
1335 | ||
1336 | if (ngroups <= 0) | |
1337 | { | |
1338 | if (ngp) | |
1339 | *ngp = 0; | |
1340 | return (char **)NULL; | |
1341 | } | |
1342 | ||
7117c2d2 | 1343 | group_vector = strvec_create (ngroups); |
d166f048 | 1344 | for (i = 0; i < ngroups; i++) |
7117c2d2 | 1345 | group_vector[i] = itos (group_array[i]); |
b72432fd | 1346 | |
d166f048 JA |
1347 | if (ngp) |
1348 | *ngp = ngroups; | |
1349 | return group_vector; | |
1350 | } | |
b72432fd JA |
1351 | |
1352 | int * | |
1353 | get_group_array (ngp) | |
1354 | int *ngp; | |
1355 | { | |
1356 | int i; | |
1357 | static int *group_iarray = (int *)NULL; | |
1358 | ||
1359 | if (group_iarray) | |
1360 | { | |
1361 | if (ngp) | |
1362 | *ngp = ngroups; | |
1363 | return (group_iarray); | |
1364 | } | |
1365 | ||
1366 | if (ngroups == 0) | |
1367 | initialize_group_array (); | |
1368 | ||
1369 | if (ngroups <= 0) | |
1370 | { | |
1371 | if (ngp) | |
1372 | *ngp = 0; | |
1373 | return (int *)NULL; | |
1374 | } | |
1375 | ||
1376 | group_iarray = (int *)xmalloc (ngroups * sizeof (int)); | |
1377 | for (i = 0; i < ngroups; i++) | |
1378 | group_iarray[i] = (int)group_array[i]; | |
1379 | ||
1380 | if (ngp) | |
1381 | *ngp = ngroups; | |
1382 | return group_iarray; | |
1383 | } | |
a0c0a00f CR |
1384 | |
1385 | /* **************************************************************** */ | |
1386 | /* */ | |
1387 | /* Miscellaneous functions */ | |
1388 | /* */ | |
1389 | /* **************************************************************** */ | |
1390 | ||
1391 | /* Return a value for PATH that is guaranteed to find all of the standard | |
1392 | utilities. This uses Posix.2 configuration variables, if present. It | |
1393 | uses a value defined in config.h as a last resort. */ | |
1394 | char * | |
1395 | conf_standard_path () | |
1396 | { | |
1397 | #if defined (_CS_PATH) && defined (HAVE_CONFSTR) | |
1398 | char *p; | |
1399 | size_t len; | |
1400 | ||
1401 | len = (size_t)confstr (_CS_PATH, (char *)NULL, (size_t)0); | |
1402 | if (len > 0) | |
1403 | { | |
1404 | p = (char *)xmalloc (len + 2); | |
1405 | *p = '\0'; | |
1406 | confstr (_CS_PATH, p, len); | |
1407 | return (p); | |
1408 | } | |
1409 | else | |
1410 | return (savestring (STANDARD_UTILS_PATH)); | |
1411 | #else /* !_CS_PATH || !HAVE_CONFSTR */ | |
1412 | # if defined (CS_PATH) | |
1413 | return (savestring (CS_PATH)); | |
1414 | # else | |
1415 | return (savestring (STANDARD_UTILS_PATH)); | |
1416 | # endif /* !CS_PATH */ | |
1417 | #endif /* !_CS_PATH || !HAVE_CONFSTR */ | |
1418 | } | |
d233b485 CR |
1419 | |
1420 | int | |
1421 | default_columns () | |
1422 | { | |
1423 | char *v; | |
1424 | int c; | |
1425 | ||
1426 | c = -1; | |
1427 | v = get_string_value ("COLUMNS"); | |
1428 | if (v && *v) | |
1429 | { | |
1430 | c = atoi (v); | |
1431 | if (c > 0) | |
1432 | return c; | |
1433 | } | |
1434 | ||
1435 | if (check_window_size) | |
1436 | get_new_window_size (0, (int *)0, &c); | |
1437 | ||
1438 | return (c > 0 ? c : 80); | |
1439 | } | |
1440 | ||
1441 |