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Commit | Line | Data |
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726f6388 JA |
1 | /* general.c -- Stuff that is used by all files. */ |
2 | ||
012bac39 | 3 | /* Copyright (C) 1987-2009 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
2e4498b3 CR |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
726f6388 | 20 | |
ccc6cda3 JA |
21 | #include "config.h" |
22 | ||
726f6388 | 23 | #include "bashtypes.h" |
cce855bc JA |
24 | #ifndef _MINIX |
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 | ||
5e13499c CR |
39 | #include "bashintl.h" |
40 | ||
726f6388 | 41 | #include "shell.h" |
e6e3b444 CR |
42 | #include "test.h" |
43 | ||
726f6388 JA |
44 | #include <tilde/tilde.h> |
45 | ||
726f6388 JA |
46 | #if !defined (errno) |
47 | extern int errno; | |
48 | #endif /* !errno */ | |
49 | ||
f73dda09 | 50 | extern int expand_aliases; |
ccc6cda3 | 51 | extern int interactive_comments; |
28ef6c31 JA |
52 | extern int check_hashed_filenames; |
53 | extern int source_uses_path; | |
54 | extern int source_searches_cwd; | |
cce855bc | 55 | |
7117c2d2 JA |
56 | static char *bash_special_tilde_expansions __P((char *)); |
57 | static int unquoted_tilde_word __P((const char *)); | |
58 | static void initialize_group_array __P((void)); | |
59 | ||
cce855bc | 60 | /* A standard error message to use when getcwd() returns NULL. */ |
d3ad40de | 61 | const char * const bash_getcwd_errstr = N_("getcwd: cannot access parent directories"); |
726f6388 | 62 | |
ccc6cda3 | 63 | /* Do whatever is necessary to initialize `Posix mode'. */ |
726f6388 | 64 | void |
ccc6cda3 JA |
65 | posix_initialize (on) |
66 | int on; | |
726f6388 | 67 | { |
28ef6c31 JA |
68 | /* Things that should be turned on when posix mode is enabled. */ |
69 | if (on != 0) | |
70 | { | |
71 | interactive_comments = source_uses_path = expand_aliases = 1; | |
5b8e93e5 | 72 | source_searches_cwd = 0; |
28ef6c31 JA |
73 | } |
74 | ||
75 | /* Things that should be turned on when posix mode is disabled. */ | |
76 | if (on == 0) | |
77 | { | |
78 | source_searches_cwd = 1; | |
79 | expand_aliases = interactive_shell; | |
80 | } | |
726f6388 JA |
81 | } |
82 | ||
ccc6cda3 JA |
83 | /* **************************************************************** */ |
84 | /* */ | |
85 | /* Functions to convert to and from and display non-standard types */ | |
86 | /* */ | |
87 | /* **************************************************************** */ | |
88 | ||
726f6388 JA |
89 | #if defined (RLIMTYPE) |
90 | RLIMTYPE | |
91 | string_to_rlimtype (s) | |
92 | char *s; | |
93 | { | |
cce855bc JA |
94 | RLIMTYPE ret; |
95 | int neg; | |
726f6388 | 96 | |
cce855bc JA |
97 | ret = 0; |
98 | neg = 0; | |
726f6388 JA |
99 | while (s && *s && whitespace (*s)) |
100 | s++; | |
824dfe68 | 101 | if (s && (*s == '-' || *s == '+')) |
726f6388 JA |
102 | { |
103 | neg = *s == '-'; | |
104 | s++; | |
105 | } | |
f73dda09 JA |
106 | for ( ; s && *s && DIGIT (*s); s++) |
107 | ret = (ret * 10) + TODIGIT (*s); | |
726f6388 JA |
108 | return (neg ? -ret : ret); |
109 | } | |
110 | ||
111 | void | |
112 | print_rlimtype (n, addnl) | |
113 | RLIMTYPE n; | |
114 | int addnl; | |
115 | { | |
f73dda09 | 116 | char s[INT_STRLEN_BOUND (RLIMTYPE) + 1], *p; |
726f6388 | 117 | |
f73dda09 JA |
118 | p = s + sizeof(s); |
119 | *--p = '\0'; | |
726f6388 JA |
120 | |
121 | if (n < 0) | |
122 | { | |
f73dda09 JA |
123 | do |
124 | *--p = '0' - n % 10; | |
125 | while ((n /= 10) != 0); | |
126 | ||
127 | *--p = '-'; | |
128 | } | |
129 | else | |
130 | { | |
131 | do | |
132 | *--p = '0' + n % 10; | |
133 | while ((n /= 10) != 0); | |
726f6388 JA |
134 | } |
135 | ||
f73dda09 | 136 | printf ("%s%s", p, addnl ? "\n" : ""); |
726f6388 JA |
137 | } |
138 | #endif /* RLIMTYPE */ | |
139 | ||
ccc6cda3 JA |
140 | /* **************************************************************** */ |
141 | /* */ | |
142 | /* Input Validation Functions */ | |
143 | /* */ | |
144 | /* **************************************************************** */ | |
145 | ||
146 | /* Return non-zero if all of the characters in STRING are digits. */ | |
147 | int | |
148 | all_digits (string) | |
149 | char *string; | |
150 | { | |
28ef6c31 JA |
151 | register char *s; |
152 | ||
153 | for (s = string; *s; s++) | |
f73dda09 | 154 | if (DIGIT (*s) == 0) |
28ef6c31 JA |
155 | return (0); |
156 | ||
ccc6cda3 JA |
157 | return (1); |
158 | } | |
159 | ||
160 | /* Return non-zero if the characters pointed to by STRING constitute a | |
161 | valid number. Stuff the converted number into RESULT if RESULT is | |
f73dda09 | 162 | not null. */ |
ccc6cda3 JA |
163 | int |
164 | legal_number (string, result) | |
d3ad40de | 165 | const char *string; |
7117c2d2 | 166 | intmax_t *result; |
ccc6cda3 | 167 | { |
7117c2d2 | 168 | intmax_t value; |
cce855bc | 169 | char *ep; |
ccc6cda3 JA |
170 | |
171 | if (result) | |
172 | *result = 0; | |
173 | ||
f73dda09 | 174 | errno = 0; |
7117c2d2 | 175 | value = strtoimax (string, &ep, 10); |
48ff5447 | 176 | if (errno || ep == string) |
f73dda09 | 177 | return 0; /* errno is set on overflow or underflow */ |
ccc6cda3 | 178 | |
7117c2d2 | 179 | /* Skip any trailing whitespace, since strtoimax does not. */ |
28ef6c31 JA |
180 | while (whitespace (*ep)) |
181 | ep++; | |
182 | ||
cce855bc JA |
183 | /* If *string is not '\0' but *ep is '\0' on return, the entire string |
184 | is valid. */ | |
185 | if (string && *string && *ep == '\0') | |
ccc6cda3 JA |
186 | { |
187 | if (result) | |
cce855bc JA |
188 | *result = value; |
189 | /* The SunOS4 implementation of strtol() will happily ignore | |
190 | overflow conditions, so this cannot do overflow correctly | |
191 | on those systems. */ | |
192 | return 1; | |
ccc6cda3 | 193 | } |
cce855bc JA |
194 | |
195 | return (0); | |
ccc6cda3 JA |
196 | } |
197 | ||
726f6388 JA |
198 | /* Return 1 if this token is a legal shell `identifier'; that is, it consists |
199 | solely of letters, digits, and underscores, and does not begin with a | |
200 | digit. */ | |
201 | int | |
202 | legal_identifier (name) | |
203 | char *name; | |
204 | { | |
205 | register char *s; | |
f73dda09 | 206 | unsigned char c; |
726f6388 | 207 | |
f73dda09 | 208 | if (!name || !(c = *name) || (legal_variable_starter (c) == 0)) |
726f6388 JA |
209 | return (0); |
210 | ||
f73dda09 | 211 | for (s = name + 1; (c = *s) != 0; s++) |
726f6388 | 212 | { |
f73dda09 | 213 | if (legal_variable_char (c) == 0) |
28ef6c31 | 214 | return (0); |
726f6388 JA |
215 | } |
216 | return (1); | |
217 | } | |
218 | ||
219 | /* Make sure that WORD is a valid shell identifier, i.e. | |
220 | does not contain a dollar sign, nor is quoted in any way. Nor | |
221 | does it consist of all digits. If CHECK_WORD is non-zero, | |
222 | the word is checked to ensure that it consists of only letters, | |
223 | digits, and underscores. */ | |
ccc6cda3 | 224 | int |
726f6388 JA |
225 | check_identifier (word, check_word) |
226 | WORD_DESC *word; | |
227 | int check_word; | |
228 | { | |
ccc6cda3 | 229 | if ((word->flags & (W_HASDOLLAR|W_QUOTED)) || all_digits (word->word)) |
726f6388 | 230 | { |
5e13499c | 231 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
232 | return (0); |
233 | } | |
234 | else if (check_word && legal_identifier (word->word) == 0) | |
235 | { | |
5e13499c | 236 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
237 | return (0); |
238 | } | |
239 | else | |
240 | return (1); | |
241 | } | |
242 | ||
1d7ecd77 CR |
243 | /* Return 1 if STRING comprises a valid alias name. The shell accepts |
244 | essentially all characters except those which must be quoted to the | |
245 | parser (which disqualifies them from alias expansion anyway) and `/'. */ | |
246 | int | |
247 | legal_alias_name (string, flags) | |
248 | char *string; | |
249 | int flags; | |
250 | { | |
251 | register char *s; | |
252 | ||
253 | for (s = string; *s; s++) | |
254 | if (shellbreak (*s) || shellxquote (*s) || shellexp (*s) || (*s == '/')) | |
255 | return 0; | |
256 | return 1; | |
257 | } | |
258 | ||
7117c2d2 JA |
259 | /* Returns non-zero if STRING is an assignment statement. The returned value |
260 | is the index of the `=' sign. */ | |
261 | int | |
5e13499c | 262 | assignment (string, flags) |
7117c2d2 | 263 | const char *string; |
5e13499c | 264 | int flags; |
7117c2d2 JA |
265 | { |
266 | register unsigned char c; | |
267 | register int newi, indx; | |
268 | ||
269 | c = string[indx = 0]; | |
270 | ||
5e13499c | 271 | #if defined (ARRAY_VARS) |
c3271763 | 272 | if ((legal_variable_starter (c) == 0) && (flags == 0 || c != '[')) /* ] */ |
5e13499c | 273 | #else |
7117c2d2 | 274 | if (legal_variable_starter (c) == 0) |
5e13499c | 275 | #endif |
7117c2d2 JA |
276 | return (0); |
277 | ||
278 | while (c = string[indx]) | |
279 | { | |
280 | /* The following is safe. Note that '=' at the start of a word | |
281 | is not an assignment statement. */ | |
282 | if (c == '=') | |
283 | return (indx); | |
284 | ||
285 | #if defined (ARRAY_VARS) | |
286 | if (c == '[') | |
287 | { | |
3eb2d94a | 288 | newi = skipsubscript (string, indx, 0); |
7117c2d2 JA |
289 | if (string[newi++] != ']') |
290 | return (0); | |
d11b8b46 CR |
291 | if (string[newi] == '+' && string[newi+1] == '=') |
292 | return (newi + 1); | |
7117c2d2 JA |
293 | return ((string[newi] == '=') ? newi : 0); |
294 | } | |
295 | #endif /* ARRAY_VARS */ | |
296 | ||
d11b8b46 CR |
297 | /* Check for `+=' */ |
298 | if (c == '+' && string[indx+1] == '=') | |
299 | return (indx + 1); | |
300 | ||
7117c2d2 JA |
301 | /* Variable names in assignment statements may contain only letters, |
302 | digits, and `_'. */ | |
303 | if (legal_variable_char (c) == 0) | |
304 | return (0); | |
305 | ||
306 | indx++; | |
307 | } | |
308 | return (0); | |
309 | } | |
310 | ||
ccc6cda3 JA |
311 | /* **************************************************************** */ |
312 | /* */ | |
313 | /* Functions to manage files and file descriptors */ | |
314 | /* */ | |
315 | /* **************************************************************** */ | |
316 | ||
726f6388 JA |
317 | /* A function to unset no-delay mode on a file descriptor. Used in shell.c |
318 | to unset it on the fd passed as stdin. Should be called on stdin if | |
319 | readline gets an EAGAIN or EWOULDBLOCK when trying to read input. */ | |
320 | ||
321 | #if !defined (O_NDELAY) | |
322 | # if defined (FNDELAY) | |
323 | # define O_NDELAY FNDELAY | |
324 | # endif | |
325 | #endif /* O_NDELAY */ | |
326 | ||
327 | /* Make sure no-delay mode is not set on file descriptor FD. */ | |
bb70624e | 328 | int |
28ef6c31 | 329 | sh_unset_nodelay_mode (fd) |
726f6388 JA |
330 | int fd; |
331 | { | |
bb70624e | 332 | int flags, bflags; |
726f6388 JA |
333 | |
334 | if ((flags = fcntl (fd, F_GETFL, 0)) < 0) | |
bb70624e | 335 | return -1; |
726f6388 | 336 | |
bb70624e | 337 | bflags = 0; |
ccc6cda3 JA |
338 | |
339 | /* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present | |
340 | and O_NDELAY is defined. */ | |
bb70624e JA |
341 | #ifdef O_NONBLOCK |
342 | bflags |= O_NONBLOCK; | |
343 | #endif | |
344 | ||
345 | #ifdef O_NDELAY | |
346 | bflags |= O_NDELAY; | |
347 | #endif | |
348 | ||
349 | if (flags & bflags) | |
726f6388 | 350 | { |
bb70624e JA |
351 | flags &= ~bflags; |
352 | return (fcntl (fd, F_SETFL, flags)); | |
726f6388 | 353 | } |
726f6388 | 354 | |
bb70624e | 355 | return 0; |
726f6388 JA |
356 | } |
357 | ||
7117c2d2 JA |
358 | /* Return 1 if file descriptor FD is valid; 0 otherwise. */ |
359 | int | |
360 | sh_validfd (fd) | |
361 | int fd; | |
362 | { | |
363 | return (fcntl (fd, F_GETFD, 0) >= 0); | |
364 | } | |
365 | ||
b72432fd JA |
366 | /* There is a bug in the NeXT 2.1 rlogind that causes opens |
367 | of /dev/tty to fail. */ | |
368 | ||
369 | #if defined (__BEOS__) | |
370 | /* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it | |
371 | into a no-op. This should probably go away in the future. */ | |
372 | # undef O_NONBLOCK | |
373 | # define O_NONBLOCK 0 | |
374 | #endif /* __BEOS__ */ | |
375 | ||
726f6388 | 376 | void |
ccc6cda3 | 377 | check_dev_tty () |
726f6388 | 378 | { |
ccc6cda3 JA |
379 | int tty_fd; |
380 | char *tty; | |
726f6388 | 381 | |
d166f048 | 382 | tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK); |
726f6388 | 383 | |
ccc6cda3 | 384 | if (tty_fd < 0) |
726f6388 | 385 | { |
ccc6cda3 JA |
386 | tty = (char *)ttyname (fileno (stdin)); |
387 | if (tty == 0) | |
388 | return; | |
d166f048 | 389 | tty_fd = open (tty, O_RDWR|O_NONBLOCK); |
726f6388 | 390 | } |
ccc6cda3 | 391 | close (tty_fd); |
726f6388 JA |
392 | } |
393 | ||
ccc6cda3 JA |
394 | /* Return 1 if PATH1 and PATH2 are the same file. This is kind of |
395 | expensive. If non-NULL STP1 and STP2 point to stat structures | |
396 | corresponding to PATH1 and PATH2, respectively. */ | |
726f6388 | 397 | int |
ccc6cda3 JA |
398 | same_file (path1, path2, stp1, stp2) |
399 | char *path1, *path2; | |
400 | struct stat *stp1, *stp2; | |
726f6388 | 401 | { |
ccc6cda3 | 402 | struct stat st1, st2; |
726f6388 | 403 | |
ccc6cda3 | 404 | if (stp1 == NULL) |
726f6388 | 405 | { |
ccc6cda3 JA |
406 | if (stat (path1, &st1) != 0) |
407 | return (0); | |
408 | stp1 = &st1; | |
726f6388 | 409 | } |
726f6388 | 410 | |
ccc6cda3 JA |
411 | if (stp2 == NULL) |
412 | { | |
413 | if (stat (path2, &st2) != 0) | |
414 | return (0); | |
415 | stp2 = &st2; | |
416 | } | |
726f6388 | 417 | |
ccc6cda3 | 418 | return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino)); |
726f6388 JA |
419 | } |
420 | ||
ccc6cda3 JA |
421 | /* Move FD to a number close to the maximum number of file descriptors |
422 | allowed in the shell process, to avoid the user stepping on it with | |
423 | redirection and causing us extra work. If CHECK_NEW is non-zero, | |
424 | we check whether or not the file descriptors are in use before | |
d166f048 JA |
425 | duplicating FD onto them. MAXFD says where to start checking the |
426 | file descriptors. If it's less than 20, we get the maximum value | |
427 | available from getdtablesize(2). */ | |
726f6388 | 428 | int |
d166f048 JA |
429 | move_to_high_fd (fd, check_new, maxfd) |
430 | int fd, check_new, maxfd; | |
726f6388 | 431 | { |
ccc6cda3 | 432 | int script_fd, nfds, ignore; |
726f6388 | 433 | |
d166f048 JA |
434 | if (maxfd < 20) |
435 | { | |
436 | nfds = getdtablesize (); | |
437 | if (nfds <= 0) | |
438 | nfds = 20; | |
7117c2d2 JA |
439 | if (nfds > HIGH_FD_MAX) |
440 | nfds = HIGH_FD_MAX; /* reasonable maximum */ | |
d166f048 JA |
441 | } |
442 | else | |
443 | nfds = maxfd; | |
726f6388 | 444 | |
ccc6cda3 JA |
445 | for (nfds--; check_new && nfds > 3; nfds--) |
446 | if (fcntl (nfds, F_GETFD, &ignore) == -1) | |
447 | break; | |
726f6388 | 448 | |
7117c2d2 | 449 | if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1) |
ccc6cda3 JA |
450 | { |
451 | if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */ | |
452 | close (fd); | |
453 | return (script_fd); | |
454 | } | |
726f6388 | 455 | |
7117c2d2 JA |
456 | /* OK, we didn't find one less than our artificial maximum; return the |
457 | original file descriptor. */ | |
ccc6cda3 JA |
458 | return (fd); |
459 | } | |
460 | ||
461 | /* Return non-zero if the characters from SAMPLE are not all valid | |
462 | characters to be found in the first line of a shell script. We | |
463 | check up to the first newline, or SAMPLE_LEN, whichever comes first. | |
464 | All of the characters must be printable or whitespace. */ | |
726f6388 | 465 | |
726f6388 | 466 | int |
ccc6cda3 | 467 | check_binary_file (sample, sample_len) |
f73dda09 | 468 | char *sample; |
ccc6cda3 | 469 | int sample_len; |
726f6388 | 470 | { |
ccc6cda3 | 471 | register int i; |
f73dda09 | 472 | unsigned char c; |
726f6388 | 473 | |
ccc6cda3 JA |
474 | for (i = 0; i < sample_len; i++) |
475 | { | |
f73dda09 JA |
476 | c = sample[i]; |
477 | if (c == '\n') | |
ccc6cda3 | 478 | return (0); |
74d9692b | 479 | if (c == '\0') |
ccc6cda3 JA |
480 | return (1); |
481 | } | |
726f6388 | 482 | |
ccc6cda3 | 483 | return (0); |
726f6388 JA |
484 | } |
485 | ||
4ac1ff98 CR |
486 | /* **************************************************************** */ |
487 | /* */ | |
488 | /* Functions to manipulate pipes */ | |
489 | /* */ | |
490 | /* **************************************************************** */ | |
491 | ||
492 | int | |
493 | sh_openpipe (pv) | |
494 | int *pv; | |
495 | { | |
496 | int r; | |
497 | ||
498 | if ((r = pipe (pv)) < 0) | |
499 | return r; | |
500 | ||
501 | pv[0] = move_to_high_fd (pv[0], 1, 64); | |
502 | pv[1] = move_to_high_fd (pv[1], 1, 64); | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | int | |
508 | sh_closepipe (pv) | |
509 | int *pv; | |
510 | { | |
511 | if (pv[0] >= 0) | |
512 | close (pv[0]); | |
513 | ||
514 | if (pv[1] >= 0) | |
515 | close (pv[1]); | |
516 | ||
517 | pv[0] = pv[1] = -1; | |
518 | return 0; | |
519 | } | |
520 | ||
fb65be05 CR |
521 | /* **************************************************************** */ |
522 | /* */ | |
523 | /* Functions to inspect pathnames */ | |
524 | /* */ | |
525 | /* **************************************************************** */ | |
526 | ||
a9fac3b2 CR |
527 | int |
528 | file_exists (fn) | |
529 | char *fn; | |
530 | { | |
531 | struct stat sb; | |
532 | ||
533 | return (stat (fn, &sb) == 0); | |
534 | } | |
535 | ||
fb65be05 CR |
536 | int |
537 | file_isdir (fn) | |
538 | char *fn; | |
539 | { | |
540 | struct stat sb; | |
541 | ||
542 | return ((stat (fn, &sb) == 0) && S_ISDIR (sb.st_mode)); | |
543 | } | |
544 | ||
545 | int | |
546 | file_iswdir (fn) | |
547 | char *fn; | |
548 | { | |
ac18b312 | 549 | return (file_isdir (fn) && sh_eaccess (fn, W_OK) == 0); |
fb65be05 CR |
550 | } |
551 | ||
ff247e74 CR |
552 | /* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd' |
553 | to decide whether or not to look up a directory name in $CDPATH. */ | |
554 | int | |
555 | absolute_pathname (string) | |
556 | const char *string; | |
557 | { | |
558 | if (string == 0 || *string == '\0') | |
559 | return (0); | |
560 | ||
561 | if (ABSPATH(string)) | |
562 | return (1); | |
563 | ||
564 | if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */ | |
565 | return (1); | |
566 | ||
567 | if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */ | |
568 | return (1); | |
569 | ||
570 | return (0); | |
571 | } | |
572 | ||
573 | /* Return 1 if STRING is an absolute program name; it is absolute if it | |
574 | contains any slashes. This is used to decide whether or not to look | |
575 | up through $PATH. */ | |
576 | int | |
577 | absolute_program (string) | |
578 | const char *string; | |
579 | { | |
d0ca3503 | 580 | return ((char *)mbschr (string, '/') != (char *)NULL); |
ff247e74 | 581 | } |
fb65be05 | 582 | |
ccc6cda3 JA |
583 | /* **************************************************************** */ |
584 | /* */ | |
585 | /* Functions to manipulate pathnames */ | |
586 | /* */ | |
587 | /* **************************************************************** */ | |
726f6388 | 588 | |
726f6388 JA |
589 | /* Turn STRING (a pathname) into an absolute pathname, assuming that |
590 | DOT_PATH contains the symbolic location of `.'. This always | |
591 | returns a new string, even if STRING was an absolute pathname to | |
592 | begin with. */ | |
593 | char * | |
594 | make_absolute (string, dot_path) | |
595 | char *string, *dot_path; | |
596 | { | |
597 | char *result; | |
ccc6cda3 | 598 | |
28ef6c31 | 599 | if (dot_path == 0 || ABSPATH(string)) |
d3a24ed2 CR |
600 | #ifdef __CYGWIN__ |
601 | { | |
602 | char pathbuf[PATH_MAX + 1]; | |
603 | ||
604 | cygwin_conv_to_full_posix_path (string, pathbuf); | |
605 | result = savestring (pathbuf); | |
606 | } | |
607 | #else | |
726f6388 | 608 | result = savestring (string); |
d3a24ed2 | 609 | #endif |
726f6388 | 610 | else |
bb70624e | 611 | result = sh_makepath (dot_path, string, 0); |
726f6388 JA |
612 | |
613 | return (result); | |
614 | } | |
615 | ||
726f6388 | 616 | /* Return the `basename' of the pathname in STRING (the stuff after the |
898cc92e | 617 | last '/'). If STRING is `/', just return it. */ |
726f6388 JA |
618 | char * |
619 | base_pathname (string) | |
620 | char *string; | |
621 | { | |
622 | char *p; | |
623 | ||
898cc92e | 624 | #if 0 |
28ef6c31 | 625 | if (absolute_pathname (string) == 0) |
726f6388 | 626 | return (string); |
898cc92e CR |
627 | #endif |
628 | ||
629 | if (string[0] == '/' && string[1] == 0) | |
630 | return (string); | |
726f6388 JA |
631 | |
632 | p = (char *)strrchr (string, '/'); | |
ccc6cda3 | 633 | return (p ? ++p : string); |
726f6388 JA |
634 | } |
635 | ||
636 | /* Return the full pathname of FILE. Easy. Filenames that begin | |
637 | with a '/' are returned as themselves. Other filenames have | |
638 | the current working directory prepended. A new string is | |
639 | returned in either case. */ | |
640 | char * | |
641 | full_pathname (file) | |
642 | char *file; | |
643 | { | |
bb70624e | 644 | char *ret; |
726f6388 | 645 | |
7117c2d2 | 646 | file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file); |
726f6388 | 647 | |
28ef6c31 | 648 | if (ABSPATH(file)) |
726f6388 JA |
649 | return (file); |
650 | ||
bb70624e JA |
651 | ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT)); |
652 | free (file); | |
726f6388 | 653 | |
bb70624e | 654 | return (ret); |
726f6388 | 655 | } |
726f6388 JA |
656 | |
657 | /* A slightly related function. Get the prettiest name of this | |
658 | directory possible. */ | |
ccc6cda3 | 659 | static char tdir[PATH_MAX]; |
726f6388 JA |
660 | |
661 | /* Return a pretty pathname. If the first part of the pathname is | |
662 | the same as $HOME, then replace that with `~'. */ | |
663 | char * | |
664 | polite_directory_format (name) | |
665 | char *name; | |
666 | { | |
ccc6cda3 JA |
667 | char *home; |
668 | int l; | |
726f6388 | 669 | |
ccc6cda3 JA |
670 | home = get_string_value ("HOME"); |
671 | l = home ? strlen (home) : 0; | |
726f6388 JA |
672 | if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/')) |
673 | { | |
e8ce775d | 674 | strncpy (tdir + 1, name + l, sizeof(tdir) - 2); |
726f6388 | 675 | tdir[0] = '~'; |
e8ce775d | 676 | tdir[sizeof(tdir) - 1] = '\0'; |
726f6388 JA |
677 | return (tdir); |
678 | } | |
679 | else | |
680 | return (name); | |
681 | } | |
682 | ||
4ac1ff98 CR |
683 | /* Trim NAME. If NAME begins with `~/', skip over tilde prefix. Trim to |
684 | keep any tilde prefix and PROMPT_DIRTRIM trailing directory components | |
685 | and replace the intervening characters with `...' */ | |
686 | char * | |
687 | trim_pathname (name, maxlen) | |
688 | char *name; | |
689 | int maxlen; | |
690 | { | |
691 | int nlen, ndirs; | |
692 | intmax_t nskip; | |
693 | char *nbeg, *nend, *ntail, *v; | |
694 | ||
695 | if (name == 0 || (nlen = strlen (name)) == 0) | |
696 | return name; | |
697 | nend = name + nlen; | |
698 | ||
699 | v = get_string_value ("PROMPT_DIRTRIM"); | |
700 | if (v == 0 || *v == 0) | |
701 | return name; | |
702 | if (legal_number (v, &nskip) == 0 || nskip <= 0) | |
703 | return name; | |
704 | ||
705 | /* Skip over tilde prefix */ | |
706 | nbeg = name; | |
707 | if (name[0] == '~') | |
708 | for (nbeg = name; *nbeg; nbeg++) | |
709 | if (*nbeg == '/') | |
710 | { | |
711 | nbeg++; | |
712 | break; | |
713 | } | |
714 | if (*nbeg == 0) | |
715 | return name; | |
716 | ||
717 | for (ndirs = 0, ntail = nbeg; *ntail; ntail++) | |
718 | if (*ntail == '/') | |
719 | ndirs++; | |
720 | if (ndirs <= nskip) | |
721 | return name; | |
722 | ||
723 | for (ntail = (*nend == '/') ? nend : nend - 1; ntail > nbeg; ntail--) | |
724 | { | |
725 | if (*ntail == '/') | |
726 | nskip--; | |
727 | if (nskip == 0) | |
728 | break; | |
729 | } | |
730 | if (ntail == nbeg) | |
731 | return name; | |
732 | ||
733 | /* Now we want to return name[0..nbeg]+"..."+ntail, modifying name in place */ | |
734 | nlen = ntail - nbeg; | |
735 | if (nlen <= 3) | |
736 | return name; | |
737 | ||
738 | *nbeg++ = '.'; | |
739 | *nbeg++ = '.'; | |
740 | *nbeg++ = '.'; | |
741 | ||
742 | nlen = nend - ntail; | |
743 | memcpy (nbeg, ntail, nlen); | |
744 | nbeg[nlen] = '\0'; | |
745 | ||
746 | return name; | |
747 | } | |
748 | ||
ccc6cda3 JA |
749 | /* Given a string containing units of information separated by colons, |
750 | return the next one pointed to by (P_INDEX), or NULL if there are no more. | |
751 | Advance (P_INDEX) to the character after the colon. */ | |
752 | char * | |
753 | extract_colon_unit (string, p_index) | |
754 | char *string; | |
755 | int *p_index; | |
726f6388 | 756 | { |
ccc6cda3 JA |
757 | int i, start, len; |
758 | char *value; | |
726f6388 | 759 | |
ccc6cda3 JA |
760 | if (string == 0) |
761 | return (string); | |
726f6388 | 762 | |
ccc6cda3 JA |
763 | len = strlen (string); |
764 | if (*p_index >= len) | |
765 | return ((char *)NULL); | |
726f6388 | 766 | |
ccc6cda3 | 767 | i = *p_index; |
726f6388 | 768 | |
ccc6cda3 JA |
769 | /* Each call to this routine leaves the index pointing at a colon if |
770 | there is more to the path. If I is > 0, then increment past the | |
771 | `:'. If I is 0, then the path has a leading colon. Trailing colons | |
772 | are handled OK by the `else' part of the if statement; an empty | |
773 | string is returned in that case. */ | |
774 | if (i && string[i] == ':') | |
775 | i++; | |
776 | ||
777 | for (start = i; string[i] && string[i] != ':'; i++) | |
778 | ; | |
779 | ||
780 | *p_index = i; | |
781 | ||
782 | if (i == start) | |
783 | { | |
784 | if (string[i]) | |
785 | (*p_index)++; | |
786 | /* Return "" in the case of a trailing `:'. */ | |
f73dda09 | 787 | value = (char *)xmalloc (1); |
ccc6cda3 JA |
788 | value[0] = '\0'; |
789 | } | |
790 | else | |
bb70624e | 791 | value = substring (string, start, i); |
ccc6cda3 JA |
792 | |
793 | return (value); | |
726f6388 | 794 | } |
726f6388 JA |
795 | |
796 | /* **************************************************************** */ | |
797 | /* */ | |
798 | /* Tilde Initialization and Expansion */ | |
799 | /* */ | |
800 | /* **************************************************************** */ | |
801 | ||
cce855bc JA |
802 | #if defined (PUSHD_AND_POPD) |
803 | extern char *get_dirstack_from_string __P((char *)); | |
804 | #endif | |
805 | ||
f73dda09 | 806 | static char **bash_tilde_prefixes; |
22e63b05 | 807 | static char **bash_tilde_prefixes2; |
f73dda09 | 808 | static char **bash_tilde_suffixes; |
22e63b05 | 809 | static char **bash_tilde_suffixes2; |
f73dda09 | 810 | |
726f6388 JA |
811 | /* If tilde_expand hasn't been able to expand the text, perhaps it |
812 | is a special shell expansion. This function is installed as the | |
cce855bc JA |
813 | tilde_expansion_preexpansion_hook. It knows how to expand ~- and ~+. |
814 | If PUSHD_AND_POPD is defined, ~[+-]N expands to directories from the | |
815 | directory stack. */ | |
726f6388 | 816 | static char * |
d166f048 | 817 | bash_special_tilde_expansions (text) |
726f6388 JA |
818 | char *text; |
819 | { | |
ccc6cda3 | 820 | char *result; |
726f6388 | 821 | |
ccc6cda3 | 822 | result = (char *)NULL; |
cce855bc JA |
823 | |
824 | if (text[0] == '+' && text[1] == '\0') | |
825 | result = get_string_value ("PWD"); | |
826 | else if (text[0] == '-' && text[1] == '\0') | |
827 | result = get_string_value ("OLDPWD"); | |
828 | #if defined (PUSHD_AND_POPD) | |
f73dda09 | 829 | else if (DIGIT (*text) || ((*text == '+' || *text == '-') && DIGIT (text[1]))) |
cce855bc JA |
830 | result = get_dirstack_from_string (text); |
831 | #endif | |
726f6388 | 832 | |
ccc6cda3 | 833 | return (result ? savestring (result) : (char *)NULL); |
726f6388 JA |
834 | } |
835 | ||
836 | /* Initialize the tilde expander. In Bash, we handle `~-' and `~+', as | |
837 | well as handling special tilde prefixes; `:~" and `=~' are indications | |
838 | that we should do tilde expansion. */ | |
839 | void | |
840 | tilde_initialize () | |
841 | { | |
842 | static int times_called = 0; | |
843 | ||
d166f048 | 844 | /* Tell the tilde expander that we want a crack first. */ |
f73dda09 | 845 | tilde_expansion_preexpansion_hook = bash_special_tilde_expansions; |
726f6388 JA |
846 | |
847 | /* Tell the tilde expander about special strings which start a tilde | |
848 | expansion, and the special strings that end one. Only do this once. | |
849 | tilde_initialize () is called from within bashline_reinitialize (). */ | |
cce855bc | 850 | if (times_called++ == 0) |
726f6388 | 851 | { |
7117c2d2 | 852 | bash_tilde_prefixes = strvec_create (3); |
f73dda09 JA |
853 | bash_tilde_prefixes[0] = "=~"; |
854 | bash_tilde_prefixes[1] = ":~"; | |
855 | bash_tilde_prefixes[2] = (char *)NULL; | |
856 | ||
22e63b05 CR |
857 | bash_tilde_prefixes2 = strvec_create (2); |
858 | bash_tilde_prefixes2[0] = ":~"; | |
859 | bash_tilde_prefixes2[1] = (char *)NULL; | |
860 | ||
f73dda09 JA |
861 | tilde_additional_prefixes = bash_tilde_prefixes; |
862 | ||
7117c2d2 | 863 | bash_tilde_suffixes = strvec_create (3); |
f73dda09 JA |
864 | bash_tilde_suffixes[0] = ":"; |
865 | bash_tilde_suffixes[1] = "=~"; /* XXX - ?? */ | |
866 | bash_tilde_suffixes[2] = (char *)NULL; | |
867 | ||
868 | tilde_additional_suffixes = bash_tilde_suffixes; | |
22e63b05 CR |
869 | |
870 | bash_tilde_suffixes2 = strvec_create (2); | |
871 | bash_tilde_suffixes2[0] = ":"; | |
872 | bash_tilde_suffixes2[1] = (char *)NULL; | |
726f6388 | 873 | } |
726f6388 JA |
874 | } |
875 | ||
f73dda09 JA |
876 | /* POSIX.2, 3.6.1: A tilde-prefix consists of an unquoted tilde character |
877 | at the beginning of the word, followed by all of the characters preceding | |
878 | the first unquoted slash in the word, or all the characters in the word | |
879 | if there is no slash...If none of the characters in the tilde-prefix are | |
880 | quoted, the characters in the tilde-prefix following the tilde shell be | |
881 | treated as a possible login name. */ | |
882 | ||
883 | #define TILDE_END(c) ((c) == '\0' || (c) == '/' || (c) == ':') | |
884 | ||
885 | static int | |
886 | unquoted_tilde_word (s) | |
887 | const char *s; | |
888 | { | |
889 | const char *r; | |
890 | ||
891 | for (r = s; TILDE_END(*r) == 0; r++) | |
892 | { | |
893 | switch (*r) | |
894 | { | |
895 | case '\\': | |
896 | case '\'': | |
897 | case '"': | |
898 | return 0; | |
899 | } | |
900 | } | |
901 | return 1; | |
902 | } | |
903 | ||
22e63b05 CR |
904 | /* Find the end of the tilde-prefix starting at S, and return the tilde |
905 | prefix in newly-allocated memory. Return the length of the string in | |
906 | *LENP. FLAGS tells whether or not we're in an assignment context -- | |
907 | if so, `:' delimits the end of the tilde prefix as well. */ | |
908 | char * | |
909 | bash_tilde_find_word (s, flags, lenp) | |
910 | const char *s; | |
911 | int flags, *lenp; | |
912 | { | |
913 | const char *r; | |
914 | char *ret; | |
915 | int l; | |
916 | ||
917 | for (r = s; *r && *r != '/'; r++) | |
918 | { | |
919 | /* Short-circuit immediately if we see a quote character. Even though | |
920 | POSIX says that `the first unquoted slash' (or `:') terminates the | |
921 | tilde-prefix, in practice, any quoted portion of the tilde prefix | |
922 | will cause it to not be expanded. */ | |
923 | if (*r == '\\' || *r == '\'' || *r == '"') | |
924 | { | |
925 | ret = savestring (s); | |
926 | if (lenp) | |
927 | *lenp = 0; | |
928 | return ret; | |
929 | } | |
930 | else if (flags && *r == ':') | |
931 | break; | |
932 | } | |
933 | l = r - s; | |
934 | ret = xmalloc (l + 1); | |
935 | strncpy (ret, s, l); | |
936 | ret[l] = '\0'; | |
937 | if (lenp) | |
938 | *lenp = l; | |
939 | return ret; | |
940 | } | |
941 | ||
7117c2d2 JA |
942 | /* Tilde-expand S by running it through the tilde expansion library. |
943 | ASSIGN_P is 1 if this is a variable assignment, so the alternate | |
22e63b05 CR |
944 | tilde prefixes should be enabled (`=~' and `:~', see above). If |
945 | ASSIGN_P is 2, we are expanding the rhs of an assignment statement, | |
946 | so `=~' is not valid. */ | |
ccc6cda3 | 947 | char * |
7117c2d2 | 948 | bash_tilde_expand (s, assign_p) |
f73dda09 | 949 | const char *s; |
7117c2d2 | 950 | int assign_p; |
726f6388 | 951 | { |
c92a890b | 952 | int old_immed, old_term, r; |
ccc6cda3 | 953 | char *ret; |
726f6388 | 954 | |
ccc6cda3 | 955 | old_immed = interrupt_immediately; |
c92a890b CR |
956 | old_term = terminate_immediately; |
957 | interrupt_immediately = terminate_immediately = 1; | |
22e63b05 CR |
958 | |
959 | tilde_additional_prefixes = assign_p == 0 ? (char **)0 | |
960 | : (assign_p == 2 ? bash_tilde_prefixes2 : bash_tilde_prefixes); | |
961 | if (assign_p == 2) | |
962 | tilde_additional_suffixes = bash_tilde_suffixes2; | |
963 | ||
f73dda09 JA |
964 | r = (*s == '~') ? unquoted_tilde_word (s) : 1; |
965 | ret = r ? tilde_expand (s) : savestring (s); | |
ccc6cda3 | 966 | interrupt_immediately = old_immed; |
c92a890b | 967 | terminate_immediately = old_term; |
ccc6cda3 | 968 | return (ret); |
726f6388 | 969 | } |
d166f048 JA |
970 | |
971 | /* **************************************************************** */ | |
972 | /* */ | |
973 | /* Functions to manipulate and search the group list */ | |
974 | /* */ | |
975 | /* **************************************************************** */ | |
976 | ||
977 | static int ngroups, maxgroups; | |
978 | ||
979 | /* The set of groups that this user is a member of. */ | |
980 | static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL; | |
981 | ||
982 | #if !defined (NOGROUP) | |
983 | # define NOGROUP (gid_t) -1 | |
984 | #endif | |
985 | ||
d166f048 JA |
986 | static void |
987 | initialize_group_array () | |
988 | { | |
989 | register int i; | |
990 | ||
991 | if (maxgroups == 0) | |
992 | maxgroups = getmaxgroups (); | |
993 | ||
994 | ngroups = 0; | |
995 | group_array = (GETGROUPS_T *)xrealloc (group_array, maxgroups * sizeof (GETGROUPS_T)); | |
996 | ||
997 | #if defined (HAVE_GETGROUPS) | |
998 | ngroups = getgroups (maxgroups, group_array); | |
999 | #endif | |
1000 | ||
1001 | /* If getgroups returns nothing, or the OS does not support getgroups(), | |
1002 | make sure the groups array includes at least the current gid. */ | |
1003 | if (ngroups == 0) | |
1004 | { | |
1005 | group_array[0] = current_user.gid; | |
1006 | ngroups = 1; | |
1007 | } | |
1008 | ||
1009 | /* If the primary group is not in the groups array, add it as group_array[0] | |
1010 | and shuffle everything else up 1, if there's room. */ | |
1011 | for (i = 0; i < ngroups; i++) | |
1012 | if (current_user.gid == (gid_t)group_array[i]) | |
1013 | break; | |
1014 | if (i == ngroups && ngroups < maxgroups) | |
1015 | { | |
1016 | for (i = ngroups; i > 0; i--) | |
28ef6c31 | 1017 | group_array[i] = group_array[i - 1]; |
d166f048 JA |
1018 | group_array[0] = current_user.gid; |
1019 | ngroups++; | |
1020 | } | |
cce855bc JA |
1021 | |
1022 | /* If the primary group is not group_array[0], swap group_array[0] and | |
1023 | whatever the current group is. The vast majority of systems should | |
1024 | not need this; a notable exception is Linux. */ | |
1025 | if (group_array[0] != current_user.gid) | |
1026 | { | |
1027 | for (i = 0; i < ngroups; i++) | |
28ef6c31 JA |
1028 | if (group_array[i] == current_user.gid) |
1029 | break; | |
cce855bc JA |
1030 | if (i < ngroups) |
1031 | { | |
1032 | group_array[i] = group_array[0]; | |
1033 | group_array[0] = current_user.gid; | |
1034 | } | |
1035 | } | |
d166f048 JA |
1036 | } |
1037 | ||
1038 | /* Return non-zero if GID is one that we have in our groups list. */ | |
1039 | int | |
cce855bc JA |
1040 | #if defined (__STDC__) || defined ( _MINIX) |
1041 | group_member (gid_t gid) | |
1042 | #else | |
d166f048 JA |
1043 | group_member (gid) |
1044 | gid_t gid; | |
cce855bc | 1045 | #endif /* !__STDC__ && !_MINIX */ |
d166f048 JA |
1046 | { |
1047 | #if defined (HAVE_GETGROUPS) | |
1048 | register int i; | |
1049 | #endif | |
1050 | ||
1051 | /* Short-circuit if possible, maybe saving a call to getgroups(). */ | |
1052 | if (gid == current_user.gid || gid == current_user.egid) | |
1053 | return (1); | |
1054 | ||
1055 | #if defined (HAVE_GETGROUPS) | |
1056 | if (ngroups == 0) | |
1057 | initialize_group_array (); | |
1058 | ||
1059 | /* In case of error, the user loses. */ | |
1060 | if (ngroups <= 0) | |
1061 | return (0); | |
1062 | ||
1063 | /* Search through the list looking for GID. */ | |
1064 | for (i = 0; i < ngroups; i++) | |
1065 | if (gid == (gid_t)group_array[i]) | |
1066 | return (1); | |
1067 | #endif | |
1068 | ||
1069 | return (0); | |
1070 | } | |
1071 | ||
1072 | char ** | |
1073 | get_group_list (ngp) | |
1074 | int *ngp; | |
1075 | { | |
1076 | static char **group_vector = (char **)NULL; | |
1077 | register int i; | |
d166f048 JA |
1078 | |
1079 | if (group_vector) | |
1080 | { | |
1081 | if (ngp) | |
1082 | *ngp = ngroups; | |
1083 | return group_vector; | |
1084 | } | |
1085 | ||
1086 | if (ngroups == 0) | |
1087 | initialize_group_array (); | |
1088 | ||
1089 | if (ngroups <= 0) | |
1090 | { | |
1091 | if (ngp) | |
1092 | *ngp = 0; | |
1093 | return (char **)NULL; | |
1094 | } | |
1095 | ||
7117c2d2 | 1096 | group_vector = strvec_create (ngroups); |
d166f048 | 1097 | for (i = 0; i < ngroups; i++) |
7117c2d2 | 1098 | group_vector[i] = itos (group_array[i]); |
b72432fd | 1099 | |
d166f048 JA |
1100 | if (ngp) |
1101 | *ngp = ngroups; | |
1102 | return group_vector; | |
1103 | } | |
b72432fd JA |
1104 | |
1105 | int * | |
1106 | get_group_array (ngp) | |
1107 | int *ngp; | |
1108 | { | |
1109 | int i; | |
1110 | static int *group_iarray = (int *)NULL; | |
1111 | ||
1112 | if (group_iarray) | |
1113 | { | |
1114 | if (ngp) | |
1115 | *ngp = ngroups; | |
1116 | return (group_iarray); | |
1117 | } | |
1118 | ||
1119 | if (ngroups == 0) | |
1120 | initialize_group_array (); | |
1121 | ||
1122 | if (ngroups <= 0) | |
1123 | { | |
1124 | if (ngp) | |
1125 | *ngp = 0; | |
1126 | return (int *)NULL; | |
1127 | } | |
1128 | ||
1129 | group_iarray = (int *)xmalloc (ngroups * sizeof (int)); | |
1130 | for (i = 0; i < ngroups; i++) | |
1131 | group_iarray[i] = (int)group_array[i]; | |
1132 | ||
1133 | if (ngp) | |
1134 | *ngp = ngroups; | |
1135 | return group_iarray; | |
1136 | } |