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Commit | Line | Data |
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726f6388 JA |
1 | /* general.c -- Stuff that is used by all files. */ |
2 | ||
1573ba78 | 3 | /* Copyright (C) 1987-2015 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" |
fd58d46e | 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 | ||
5e13499c CR |
39 | #include "bashintl.h" |
40 | ||
726f6388 | 41 | #include "shell.h" |
e6e3b444 | 42 | #include "test.h" |
5f0df7f9 | 43 | #include "trap.h" |
e6e3b444 | 44 | |
c4c90ef8 CR |
45 | #if defined (HAVE_MBSTR_H) && defined (HAVE_MBSCHR) |
46 | # include <mbstr.h> /* mbschr */ | |
47 | #endif | |
48 | ||
726f6388 JA |
49 | #include <tilde/tilde.h> |
50 | ||
726f6388 JA |
51 | #if !defined (errno) |
52 | extern int errno; | |
53 | #endif /* !errno */ | |
54 | ||
f73dda09 | 55 | extern int expand_aliases; |
ccc6cda3 | 56 | extern int interactive_comments; |
28ef6c31 JA |
57 | extern int check_hashed_filenames; |
58 | extern int source_uses_path; | |
59 | extern int source_searches_cwd; | |
30595b57 | 60 | extern int posixly_correct; |
cce855bc | 61 | |
7117c2d2 JA |
62 | static char *bash_special_tilde_expansions __P((char *)); |
63 | static int unquoted_tilde_word __P((const char *)); | |
64 | static void initialize_group_array __P((void)); | |
65 | ||
cce855bc | 66 | /* A standard error message to use when getcwd() returns NULL. */ |
d3ad40de | 67 | const char * const bash_getcwd_errstr = N_("getcwd: cannot access parent directories"); |
726f6388 | 68 | |
ccc6cda3 | 69 | /* Do whatever is necessary to initialize `Posix mode'. */ |
726f6388 | 70 | void |
ccc6cda3 JA |
71 | posix_initialize (on) |
72 | int on; | |
726f6388 | 73 | { |
28ef6c31 JA |
74 | /* Things that should be turned on when posix mode is enabled. */ |
75 | if (on != 0) | |
76 | { | |
77 | interactive_comments = source_uses_path = expand_aliases = 1; | |
5b8e93e5 | 78 | source_searches_cwd = 0; |
28ef6c31 JA |
79 | } |
80 | ||
81 | /* Things that should be turned on when posix mode is disabled. */ | |
82 | if (on == 0) | |
83 | { | |
84 | source_searches_cwd = 1; | |
85 | expand_aliases = interactive_shell; | |
86 | } | |
726f6388 JA |
87 | } |
88 | ||
ccc6cda3 JA |
89 | /* **************************************************************** */ |
90 | /* */ | |
91 | /* Functions to convert to and from and display non-standard types */ | |
92 | /* */ | |
93 | /* **************************************************************** */ | |
94 | ||
726f6388 JA |
95 | #if defined (RLIMTYPE) |
96 | RLIMTYPE | |
97 | string_to_rlimtype (s) | |
98 | char *s; | |
99 | { | |
cce855bc JA |
100 | RLIMTYPE ret; |
101 | int neg; | |
726f6388 | 102 | |
cce855bc JA |
103 | ret = 0; |
104 | neg = 0; | |
726f6388 JA |
105 | while (s && *s && whitespace (*s)) |
106 | s++; | |
824dfe68 | 107 | if (s && (*s == '-' || *s == '+')) |
726f6388 JA |
108 | { |
109 | neg = *s == '-'; | |
110 | s++; | |
111 | } | |
f73dda09 JA |
112 | for ( ; s && *s && DIGIT (*s); s++) |
113 | ret = (ret * 10) + TODIGIT (*s); | |
726f6388 JA |
114 | return (neg ? -ret : ret); |
115 | } | |
116 | ||
117 | void | |
118 | print_rlimtype (n, addnl) | |
119 | RLIMTYPE n; | |
120 | int addnl; | |
121 | { | |
f73dda09 | 122 | char s[INT_STRLEN_BOUND (RLIMTYPE) + 1], *p; |
726f6388 | 123 | |
f73dda09 JA |
124 | p = s + sizeof(s); |
125 | *--p = '\0'; | |
726f6388 JA |
126 | |
127 | if (n < 0) | |
128 | { | |
f73dda09 JA |
129 | do |
130 | *--p = '0' - n % 10; | |
131 | while ((n /= 10) != 0); | |
132 | ||
133 | *--p = '-'; | |
134 | } | |
135 | else | |
136 | { | |
137 | do | |
138 | *--p = '0' + n % 10; | |
139 | while ((n /= 10) != 0); | |
726f6388 JA |
140 | } |
141 | ||
f73dda09 | 142 | printf ("%s%s", p, addnl ? "\n" : ""); |
726f6388 JA |
143 | } |
144 | #endif /* RLIMTYPE */ | |
145 | ||
ccc6cda3 JA |
146 | /* **************************************************************** */ |
147 | /* */ | |
148 | /* Input Validation Functions */ | |
149 | /* */ | |
150 | /* **************************************************************** */ | |
151 | ||
152 | /* Return non-zero if all of the characters in STRING are digits. */ | |
153 | int | |
154 | all_digits (string) | |
155 | char *string; | |
156 | { | |
28ef6c31 JA |
157 | register char *s; |
158 | ||
159 | for (s = string; *s; s++) | |
f73dda09 | 160 | if (DIGIT (*s) == 0) |
28ef6c31 JA |
161 | return (0); |
162 | ||
ccc6cda3 JA |
163 | return (1); |
164 | } | |
165 | ||
166 | /* Return non-zero if the characters pointed to by STRING constitute a | |
167 | valid number. Stuff the converted number into RESULT if RESULT is | |
f73dda09 | 168 | not null. */ |
ccc6cda3 JA |
169 | int |
170 | legal_number (string, result) | |
d3ad40de | 171 | const char *string; |
7117c2d2 | 172 | intmax_t *result; |
ccc6cda3 | 173 | { |
7117c2d2 | 174 | intmax_t value; |
cce855bc | 175 | char *ep; |
ccc6cda3 JA |
176 | |
177 | if (result) | |
178 | *result = 0; | |
179 | ||
631b20c6 CR |
180 | if (string == 0) |
181 | return 0; | |
182 | ||
f73dda09 | 183 | errno = 0; |
7117c2d2 | 184 | value = strtoimax (string, &ep, 10); |
48ff5447 | 185 | if (errno || ep == string) |
f73dda09 | 186 | return 0; /* errno is set on overflow or underflow */ |
ccc6cda3 | 187 | |
7117c2d2 | 188 | /* Skip any trailing whitespace, since strtoimax does not. */ |
28ef6c31 JA |
189 | while (whitespace (*ep)) |
190 | ep++; | |
191 | ||
cce855bc JA |
192 | /* If *string is not '\0' but *ep is '\0' on return, the entire string |
193 | is valid. */ | |
631b20c6 | 194 | if (*string && *ep == '\0') |
ccc6cda3 JA |
195 | { |
196 | if (result) | |
cce855bc JA |
197 | *result = value; |
198 | /* The SunOS4 implementation of strtol() will happily ignore | |
199 | overflow conditions, so this cannot do overflow correctly | |
200 | on those systems. */ | |
201 | return 1; | |
ccc6cda3 | 202 | } |
cce855bc JA |
203 | |
204 | return (0); | |
ccc6cda3 JA |
205 | } |
206 | ||
726f6388 JA |
207 | /* Return 1 if this token is a legal shell `identifier'; that is, it consists |
208 | solely of letters, digits, and underscores, and does not begin with a | |
209 | digit. */ | |
210 | int | |
211 | legal_identifier (name) | |
212 | char *name; | |
213 | { | |
214 | register char *s; | |
f73dda09 | 215 | unsigned char c; |
726f6388 | 216 | |
f73dda09 | 217 | if (!name || !(c = *name) || (legal_variable_starter (c) == 0)) |
726f6388 JA |
218 | return (0); |
219 | ||
f73dda09 | 220 | for (s = name + 1; (c = *s) != 0; s++) |
726f6388 | 221 | { |
f73dda09 | 222 | if (legal_variable_char (c) == 0) |
28ef6c31 | 223 | return (0); |
726f6388 JA |
224 | } |
225 | return (1); | |
226 | } | |
227 | ||
228 | /* Make sure that WORD is a valid shell identifier, i.e. | |
229 | does not contain a dollar sign, nor is quoted in any way. Nor | |
230 | does it consist of all digits. If CHECK_WORD is non-zero, | |
231 | the word is checked to ensure that it consists of only letters, | |
232 | digits, and underscores. */ | |
ccc6cda3 | 233 | int |
726f6388 JA |
234 | check_identifier (word, check_word) |
235 | WORD_DESC *word; | |
236 | int check_word; | |
237 | { | |
ccc6cda3 | 238 | if ((word->flags & (W_HASDOLLAR|W_QUOTED)) || all_digits (word->word)) |
726f6388 | 239 | { |
5e13499c | 240 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
241 | return (0); |
242 | } | |
243 | else if (check_word && legal_identifier (word->word) == 0) | |
244 | { | |
5e13499c | 245 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
246 | return (0); |
247 | } | |
248 | else | |
249 | return (1); | |
250 | } | |
251 | ||
613d4ba4 CR |
252 | /* Return 1 if STRING is a function name that the shell will import from |
253 | the environment. Currently we reject attempts to import shell functions | |
254 | containing slashes, beginning with newlines or containing blanks. In | |
255 | Posix mode, we require that STRING be a valid shell identifier. Not | |
256 | used yet. */ | |
30595b57 | 257 | int |
613d4ba4 | 258 | importable_function_name (string, len) |
30595b57 | 259 | char *string; |
613d4ba4 | 260 | size_t len; |
30595b57 CR |
261 | { |
262 | if (absolute_program (string)) /* don't allow slash */ | |
263 | return 0; | |
613d4ba4 CR |
264 | if (*string == '\n') /* can't start with a newline */ |
265 | return 0; | |
266 | if (shellblank (*string) || shellblank(string[len-1])) | |
267 | return 0; | |
30595b57 CR |
268 | return (posixly_correct ? legal_identifier (string) : 1); |
269 | } | |
270 | ||
613d4ba4 CR |
271 | int |
272 | exportable_function_name (string) | |
273 | char *string; | |
274 | { | |
275 | if (absolute_program (string)) | |
276 | return 0; | |
277 | if (mbschr (string, '=') != 0) | |
278 | return 0; | |
279 | return 1; | |
280 | } | |
281 | ||
1d7ecd77 CR |
282 | /* Return 1 if STRING comprises a valid alias name. The shell accepts |
283 | essentially all characters except those which must be quoted to the | |
284 | parser (which disqualifies them from alias expansion anyway) and `/'. */ | |
285 | int | |
286 | legal_alias_name (string, flags) | |
287 | char *string; | |
288 | int flags; | |
289 | { | |
290 | register char *s; | |
291 | ||
292 | for (s = string; *s; s++) | |
293 | if (shellbreak (*s) || shellxquote (*s) || shellexp (*s) || (*s == '/')) | |
294 | return 0; | |
295 | return 1; | |
296 | } | |
297 | ||
7117c2d2 JA |
298 | /* Returns non-zero if STRING is an assignment statement. The returned value |
299 | is the index of the `=' sign. */ | |
300 | int | |
5e13499c | 301 | assignment (string, flags) |
7117c2d2 | 302 | const char *string; |
5e13499c | 303 | int flags; |
7117c2d2 JA |
304 | { |
305 | register unsigned char c; | |
306 | register int newi, indx; | |
307 | ||
308 | c = string[indx = 0]; | |
309 | ||
5e13499c | 310 | #if defined (ARRAY_VARS) |
c3271763 | 311 | if ((legal_variable_starter (c) == 0) && (flags == 0 || c != '[')) /* ] */ |
5e13499c | 312 | #else |
7117c2d2 | 313 | if (legal_variable_starter (c) == 0) |
5e13499c | 314 | #endif |
7117c2d2 JA |
315 | return (0); |
316 | ||
317 | while (c = string[indx]) | |
318 | { | |
319 | /* The following is safe. Note that '=' at the start of a word | |
320 | is not an assignment statement. */ | |
321 | if (c == '=') | |
322 | return (indx); | |
323 | ||
324 | #if defined (ARRAY_VARS) | |
325 | if (c == '[') | |
326 | { | |
3eb2d94a | 327 | newi = skipsubscript (string, indx, 0); |
7117c2d2 JA |
328 | if (string[newi++] != ']') |
329 | return (0); | |
d11b8b46 CR |
330 | if (string[newi] == '+' && string[newi+1] == '=') |
331 | return (newi + 1); | |
7117c2d2 JA |
332 | return ((string[newi] == '=') ? newi : 0); |
333 | } | |
334 | #endif /* ARRAY_VARS */ | |
335 | ||
d11b8b46 CR |
336 | /* Check for `+=' */ |
337 | if (c == '+' && string[indx+1] == '=') | |
338 | return (indx + 1); | |
339 | ||
7117c2d2 JA |
340 | /* Variable names in assignment statements may contain only letters, |
341 | digits, and `_'. */ | |
342 | if (legal_variable_char (c) == 0) | |
343 | return (0); | |
344 | ||
345 | indx++; | |
346 | } | |
347 | return (0); | |
348 | } | |
349 | ||
ccc6cda3 JA |
350 | /* **************************************************************** */ |
351 | /* */ | |
352 | /* Functions to manage files and file descriptors */ | |
353 | /* */ | |
354 | /* **************************************************************** */ | |
355 | ||
726f6388 JA |
356 | /* A function to unset no-delay mode on a file descriptor. Used in shell.c |
357 | to unset it on the fd passed as stdin. Should be called on stdin if | |
358 | readline gets an EAGAIN or EWOULDBLOCK when trying to read input. */ | |
359 | ||
360 | #if !defined (O_NDELAY) | |
361 | # if defined (FNDELAY) | |
362 | # define O_NDELAY FNDELAY | |
363 | # endif | |
364 | #endif /* O_NDELAY */ | |
365 | ||
366 | /* Make sure no-delay mode is not set on file descriptor FD. */ | |
bb70624e | 367 | int |
28ef6c31 | 368 | sh_unset_nodelay_mode (fd) |
726f6388 JA |
369 | int fd; |
370 | { | |
bb70624e | 371 | int flags, bflags; |
726f6388 JA |
372 | |
373 | if ((flags = fcntl (fd, F_GETFL, 0)) < 0) | |
bb70624e | 374 | return -1; |
726f6388 | 375 | |
bb70624e | 376 | bflags = 0; |
ccc6cda3 JA |
377 | |
378 | /* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present | |
379 | and O_NDELAY is defined. */ | |
bb70624e JA |
380 | #ifdef O_NONBLOCK |
381 | bflags |= O_NONBLOCK; | |
382 | #endif | |
383 | ||
384 | #ifdef O_NDELAY | |
385 | bflags |= O_NDELAY; | |
386 | #endif | |
387 | ||
388 | if (flags & bflags) | |
726f6388 | 389 | { |
bb70624e JA |
390 | flags &= ~bflags; |
391 | return (fcntl (fd, F_SETFL, flags)); | |
726f6388 | 392 | } |
726f6388 | 393 | |
bb70624e | 394 | return 0; |
726f6388 JA |
395 | } |
396 | ||
7117c2d2 JA |
397 | /* Return 1 if file descriptor FD is valid; 0 otherwise. */ |
398 | int | |
399 | sh_validfd (fd) | |
400 | int fd; | |
401 | { | |
402 | return (fcntl (fd, F_GETFD, 0) >= 0); | |
403 | } | |
404 | ||
510e20a2 CR |
405 | int |
406 | fd_ispipe (fd) | |
407 | int fd; | |
408 | { | |
409 | errno = 0; | |
34ec1876 | 410 | return ((lseek (fd, 0L, SEEK_CUR) < 0) && (errno == ESPIPE)); |
510e20a2 CR |
411 | } |
412 | ||
b72432fd JA |
413 | /* There is a bug in the NeXT 2.1 rlogind that causes opens |
414 | of /dev/tty to fail. */ | |
415 | ||
416 | #if defined (__BEOS__) | |
417 | /* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it | |
418 | into a no-op. This should probably go away in the future. */ | |
419 | # undef O_NONBLOCK | |
420 | # define O_NONBLOCK 0 | |
421 | #endif /* __BEOS__ */ | |
422 | ||
726f6388 | 423 | void |
ccc6cda3 | 424 | check_dev_tty () |
726f6388 | 425 | { |
ccc6cda3 JA |
426 | int tty_fd; |
427 | char *tty; | |
726f6388 | 428 | |
d166f048 | 429 | tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK); |
726f6388 | 430 | |
ccc6cda3 | 431 | if (tty_fd < 0) |
726f6388 | 432 | { |
ccc6cda3 JA |
433 | tty = (char *)ttyname (fileno (stdin)); |
434 | if (tty == 0) | |
435 | return; | |
d166f048 | 436 | tty_fd = open (tty, O_RDWR|O_NONBLOCK); |
726f6388 | 437 | } |
631b20c6 CR |
438 | if (tty_fd >= 0) |
439 | close (tty_fd); | |
726f6388 JA |
440 | } |
441 | ||
ccc6cda3 JA |
442 | /* Return 1 if PATH1 and PATH2 are the same file. This is kind of |
443 | expensive. If non-NULL STP1 and STP2 point to stat structures | |
444 | corresponding to PATH1 and PATH2, respectively. */ | |
726f6388 | 445 | int |
ccc6cda3 JA |
446 | same_file (path1, path2, stp1, stp2) |
447 | char *path1, *path2; | |
448 | struct stat *stp1, *stp2; | |
726f6388 | 449 | { |
ccc6cda3 | 450 | struct stat st1, st2; |
726f6388 | 451 | |
ccc6cda3 | 452 | if (stp1 == NULL) |
726f6388 | 453 | { |
ccc6cda3 JA |
454 | if (stat (path1, &st1) != 0) |
455 | return (0); | |
456 | stp1 = &st1; | |
726f6388 | 457 | } |
726f6388 | 458 | |
ccc6cda3 JA |
459 | if (stp2 == NULL) |
460 | { | |
461 | if (stat (path2, &st2) != 0) | |
462 | return (0); | |
463 | stp2 = &st2; | |
464 | } | |
726f6388 | 465 | |
ccc6cda3 | 466 | return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino)); |
726f6388 JA |
467 | } |
468 | ||
ccc6cda3 JA |
469 | /* Move FD to a number close to the maximum number of file descriptors |
470 | allowed in the shell process, to avoid the user stepping on it with | |
471 | redirection and causing us extra work. If CHECK_NEW is non-zero, | |
472 | we check whether or not the file descriptors are in use before | |
d166f048 JA |
473 | duplicating FD onto them. MAXFD says where to start checking the |
474 | file descriptors. If it's less than 20, we get the maximum value | |
475 | available from getdtablesize(2). */ | |
726f6388 | 476 | int |
d166f048 JA |
477 | move_to_high_fd (fd, check_new, maxfd) |
478 | int fd, check_new, maxfd; | |
726f6388 | 479 | { |
ccc6cda3 | 480 | int script_fd, nfds, ignore; |
726f6388 | 481 | |
d166f048 JA |
482 | if (maxfd < 20) |
483 | { | |
484 | nfds = getdtablesize (); | |
485 | if (nfds <= 0) | |
486 | nfds = 20; | |
7117c2d2 JA |
487 | if (nfds > HIGH_FD_MAX) |
488 | nfds = HIGH_FD_MAX; /* reasonable maximum */ | |
d166f048 JA |
489 | } |
490 | else | |
491 | nfds = maxfd; | |
726f6388 | 492 | |
ccc6cda3 JA |
493 | for (nfds--; check_new && nfds > 3; nfds--) |
494 | if (fcntl (nfds, F_GETFD, &ignore) == -1) | |
495 | break; | |
726f6388 | 496 | |
7117c2d2 | 497 | if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1) |
ccc6cda3 JA |
498 | { |
499 | if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */ | |
500 | close (fd); | |
501 | return (script_fd); | |
502 | } | |
726f6388 | 503 | |
7117c2d2 JA |
504 | /* OK, we didn't find one less than our artificial maximum; return the |
505 | original file descriptor. */ | |
ccc6cda3 JA |
506 | return (fd); |
507 | } | |
508 | ||
509 | /* Return non-zero if the characters from SAMPLE are not all valid | |
510 | characters to be found in the first line of a shell script. We | |
511 | check up to the first newline, or SAMPLE_LEN, whichever comes first. | |
512 | All of the characters must be printable or whitespace. */ | |
726f6388 | 513 | |
726f6388 | 514 | int |
ccc6cda3 | 515 | check_binary_file (sample, sample_len) |
f73dda09 | 516 | char *sample; |
ccc6cda3 | 517 | int sample_len; |
726f6388 | 518 | { |
ccc6cda3 | 519 | register int i; |
f73dda09 | 520 | unsigned char c; |
726f6388 | 521 | |
ccc6cda3 JA |
522 | for (i = 0; i < sample_len; i++) |
523 | { | |
f73dda09 JA |
524 | c = sample[i]; |
525 | if (c == '\n') | |
ccc6cda3 | 526 | return (0); |
74d9692b | 527 | if (c == '\0') |
ccc6cda3 JA |
528 | return (1); |
529 | } | |
726f6388 | 530 | |
ccc6cda3 | 531 | return (0); |
726f6388 JA |
532 | } |
533 | ||
4ac1ff98 CR |
534 | /* **************************************************************** */ |
535 | /* */ | |
536 | /* Functions to manipulate pipes */ | |
537 | /* */ | |
538 | /* **************************************************************** */ | |
539 | ||
540 | int | |
541 | sh_openpipe (pv) | |
542 | int *pv; | |
543 | { | |
544 | int r; | |
545 | ||
546 | if ((r = pipe (pv)) < 0) | |
547 | return r; | |
548 | ||
549 | pv[0] = move_to_high_fd (pv[0], 1, 64); | |
550 | pv[1] = move_to_high_fd (pv[1], 1, 64); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | int | |
556 | sh_closepipe (pv) | |
557 | int *pv; | |
558 | { | |
559 | if (pv[0] >= 0) | |
560 | close (pv[0]); | |
561 | ||
562 | if (pv[1] >= 0) | |
563 | close (pv[1]); | |
564 | ||
565 | pv[0] = pv[1] = -1; | |
566 | return 0; | |
567 | } | |
568 | ||
fb65be05 CR |
569 | /* **************************************************************** */ |
570 | /* */ | |
571 | /* Functions to inspect pathnames */ | |
572 | /* */ | |
573 | /* **************************************************************** */ | |
574 | ||
a9fac3b2 CR |
575 | int |
576 | file_exists (fn) | |
577 | char *fn; | |
578 | { | |
579 | struct stat sb; | |
580 | ||
581 | return (stat (fn, &sb) == 0); | |
582 | } | |
583 | ||
fb65be05 CR |
584 | int |
585 | file_isdir (fn) | |
586 | char *fn; | |
587 | { | |
588 | struct stat sb; | |
589 | ||
590 | return ((stat (fn, &sb) == 0) && S_ISDIR (sb.st_mode)); | |
591 | } | |
592 | ||
593 | int | |
594 | file_iswdir (fn) | |
595 | char *fn; | |
596 | { | |
ac18b312 | 597 | return (file_isdir (fn) && sh_eaccess (fn, W_OK) == 0); |
fb65be05 CR |
598 | } |
599 | ||
510e20a2 CR |
600 | /* Return 1 if STRING is "." or "..", optionally followed by a directory |
601 | separator */ | |
602 | int | |
3d4f66ca | 603 | path_dot_or_dotdot (string) |
510e20a2 CR |
604 | const char *string; |
605 | { | |
606 | if (string == 0 || *string == '\0' || *string != '.') | |
607 | return (0); | |
608 | ||
609 | /* string[0] == '.' */ | |
610 | if (PATHSEP(string[1]) || (string[1] == '.' && PATHSEP(string[2]))) | |
611 | return (1); | |
612 | ||
613 | return (0); | |
614 | } | |
615 | ||
ff247e74 CR |
616 | /* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd' |
617 | to decide whether or not to look up a directory name in $CDPATH. */ | |
618 | int | |
619 | absolute_pathname (string) | |
620 | const char *string; | |
621 | { | |
622 | if (string == 0 || *string == '\0') | |
623 | return (0); | |
624 | ||
625 | if (ABSPATH(string)) | |
626 | return (1); | |
627 | ||
628 | if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */ | |
629 | return (1); | |
630 | ||
631 | if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */ | |
632 | return (1); | |
633 | ||
634 | return (0); | |
635 | } | |
636 | ||
637 | /* Return 1 if STRING is an absolute program name; it is absolute if it | |
638 | contains any slashes. This is used to decide whether or not to look | |
639 | up through $PATH. */ | |
640 | int | |
641 | absolute_program (string) | |
642 | const char *string; | |
643 | { | |
d0ca3503 | 644 | return ((char *)mbschr (string, '/') != (char *)NULL); |
ff247e74 | 645 | } |
fb65be05 | 646 | |
ccc6cda3 JA |
647 | /* **************************************************************** */ |
648 | /* */ | |
649 | /* Functions to manipulate pathnames */ | |
650 | /* */ | |
651 | /* **************************************************************** */ | |
726f6388 | 652 | |
726f6388 JA |
653 | /* Turn STRING (a pathname) into an absolute pathname, assuming that |
654 | DOT_PATH contains the symbolic location of `.'. This always | |
655 | returns a new string, even if STRING was an absolute pathname to | |
656 | begin with. */ | |
657 | char * | |
658 | make_absolute (string, dot_path) | |
659 | char *string, *dot_path; | |
660 | { | |
661 | char *result; | |
ccc6cda3 | 662 | |
28ef6c31 | 663 | if (dot_path == 0 || ABSPATH(string)) |
d3a24ed2 CR |
664 | #ifdef __CYGWIN__ |
665 | { | |
666 | char pathbuf[PATH_MAX + 1]; | |
667 | ||
668 | cygwin_conv_to_full_posix_path (string, pathbuf); | |
669 | result = savestring (pathbuf); | |
670 | } | |
671 | #else | |
726f6388 | 672 | result = savestring (string); |
d3a24ed2 | 673 | #endif |
726f6388 | 674 | else |
bb70624e | 675 | result = sh_makepath (dot_path, string, 0); |
726f6388 JA |
676 | |
677 | return (result); | |
678 | } | |
679 | ||
726f6388 | 680 | /* Return the `basename' of the pathname in STRING (the stuff after the |
898cc92e | 681 | last '/'). If STRING is `/', just return it. */ |
726f6388 JA |
682 | char * |
683 | base_pathname (string) | |
684 | char *string; | |
685 | { | |
686 | char *p; | |
687 | ||
898cc92e | 688 | #if 0 |
28ef6c31 | 689 | if (absolute_pathname (string) == 0) |
726f6388 | 690 | return (string); |
898cc92e CR |
691 | #endif |
692 | ||
693 | if (string[0] == '/' && string[1] == 0) | |
694 | return (string); | |
726f6388 JA |
695 | |
696 | p = (char *)strrchr (string, '/'); | |
ccc6cda3 | 697 | return (p ? ++p : string); |
726f6388 JA |
698 | } |
699 | ||
700 | /* Return the full pathname of FILE. Easy. Filenames that begin | |
701 | with a '/' are returned as themselves. Other filenames have | |
702 | the current working directory prepended. A new string is | |
703 | returned in either case. */ | |
704 | char * | |
705 | full_pathname (file) | |
706 | char *file; | |
707 | { | |
bb70624e | 708 | char *ret; |
726f6388 | 709 | |
7117c2d2 | 710 | file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file); |
726f6388 | 711 | |
28ef6c31 | 712 | if (ABSPATH(file)) |
726f6388 JA |
713 | return (file); |
714 | ||
bb70624e JA |
715 | ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT)); |
716 | free (file); | |
726f6388 | 717 | |
bb70624e | 718 | return (ret); |
726f6388 | 719 | } |
726f6388 JA |
720 | |
721 | /* A slightly related function. Get the prettiest name of this | |
722 | directory possible. */ | |
ccc6cda3 | 723 | static char tdir[PATH_MAX]; |
726f6388 JA |
724 | |
725 | /* Return a pretty pathname. If the first part of the pathname is | |
726 | the same as $HOME, then replace that with `~'. */ | |
727 | char * | |
728 | polite_directory_format (name) | |
729 | char *name; | |
730 | { | |
ccc6cda3 JA |
731 | char *home; |
732 | int l; | |
726f6388 | 733 | |
ccc6cda3 JA |
734 | home = get_string_value ("HOME"); |
735 | l = home ? strlen (home) : 0; | |
726f6388 JA |
736 | if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/')) |
737 | { | |
e8ce775d | 738 | strncpy (tdir + 1, name + l, sizeof(tdir) - 2); |
726f6388 | 739 | tdir[0] = '~'; |
e8ce775d | 740 | tdir[sizeof(tdir) - 1] = '\0'; |
726f6388 JA |
741 | return (tdir); |
742 | } | |
743 | else | |
744 | return (name); | |
745 | } | |
746 | ||
4ac1ff98 CR |
747 | /* Trim NAME. If NAME begins with `~/', skip over tilde prefix. Trim to |
748 | keep any tilde prefix and PROMPT_DIRTRIM trailing directory components | |
749 | and replace the intervening characters with `...' */ | |
750 | char * | |
751 | trim_pathname (name, maxlen) | |
752 | char *name; | |
753 | int maxlen; | |
754 | { | |
755 | int nlen, ndirs; | |
756 | intmax_t nskip; | |
757 | char *nbeg, *nend, *ntail, *v; | |
758 | ||
759 | if (name == 0 || (nlen = strlen (name)) == 0) | |
760 | return name; | |
761 | nend = name + nlen; | |
762 | ||
763 | v = get_string_value ("PROMPT_DIRTRIM"); | |
764 | if (v == 0 || *v == 0) | |
765 | return name; | |
766 | if (legal_number (v, &nskip) == 0 || nskip <= 0) | |
767 | return name; | |
768 | ||
769 | /* Skip over tilde prefix */ | |
770 | nbeg = name; | |
771 | if (name[0] == '~') | |
772 | for (nbeg = name; *nbeg; nbeg++) | |
773 | if (*nbeg == '/') | |
774 | { | |
775 | nbeg++; | |
776 | break; | |
777 | } | |
778 | if (*nbeg == 0) | |
779 | return name; | |
780 | ||
781 | for (ndirs = 0, ntail = nbeg; *ntail; ntail++) | |
782 | if (*ntail == '/') | |
783 | ndirs++; | |
f486d0a1 | 784 | if (ndirs < nskip) |
4ac1ff98 CR |
785 | return name; |
786 | ||
787 | for (ntail = (*nend == '/') ? nend : nend - 1; ntail > nbeg; ntail--) | |
788 | { | |
789 | if (*ntail == '/') | |
790 | nskip--; | |
791 | if (nskip == 0) | |
792 | break; | |
793 | } | |
794 | if (ntail == nbeg) | |
795 | return name; | |
796 | ||
797 | /* Now we want to return name[0..nbeg]+"..."+ntail, modifying name in place */ | |
798 | nlen = ntail - nbeg; | |
799 | if (nlen <= 3) | |
800 | return name; | |
801 | ||
802 | *nbeg++ = '.'; | |
803 | *nbeg++ = '.'; | |
804 | *nbeg++ = '.'; | |
805 | ||
806 | nlen = nend - ntail; | |
c2fa6583 | 807 | memmove (nbeg, ntail, nlen); |
4ac1ff98 CR |
808 | nbeg[nlen] = '\0'; |
809 | ||
810 | return name; | |
811 | } | |
812 | ||
96f3fb66 CR |
813 | /* Return a printable representation of FN without special characters. The |
814 | caller is responsible for freeing memory if this returns something other | |
815 | than its argument. If FLAGS is non-zero, we are printing for portable | |
816 | re-input and should single-quote filenames appropriately. */ | |
817 | char * | |
818 | printable_filename (fn, flags) | |
819 | char *fn; | |
820 | int flags; | |
821 | { | |
822 | char *newf; | |
823 | ||
824 | if (ansic_shouldquote (fn)) | |
825 | newf = ansic_quote (fn, 0, NULL); | |
826 | else if (flags && sh_contains_shell_metas (fn)) | |
827 | newf = sh_single_quote (fn); | |
828 | else | |
829 | newf = fn; | |
830 | ||
831 | return newf; | |
832 | } | |
833 | ||
ccc6cda3 JA |
834 | /* Given a string containing units of information separated by colons, |
835 | return the next one pointed to by (P_INDEX), or NULL if there are no more. | |
836 | Advance (P_INDEX) to the character after the colon. */ | |
837 | char * | |
838 | extract_colon_unit (string, p_index) | |
839 | char *string; | |
840 | int *p_index; | |
726f6388 | 841 | { |
ccc6cda3 JA |
842 | int i, start, len; |
843 | char *value; | |
726f6388 | 844 | |
ccc6cda3 JA |
845 | if (string == 0) |
846 | return (string); | |
726f6388 | 847 | |
ccc6cda3 JA |
848 | len = strlen (string); |
849 | if (*p_index >= len) | |
850 | return ((char *)NULL); | |
726f6388 | 851 | |
ccc6cda3 | 852 | i = *p_index; |
726f6388 | 853 | |
ccc6cda3 JA |
854 | /* Each call to this routine leaves the index pointing at a colon if |
855 | there is more to the path. If I is > 0, then increment past the | |
856 | `:'. If I is 0, then the path has a leading colon. Trailing colons | |
857 | are handled OK by the `else' part of the if statement; an empty | |
858 | string is returned in that case. */ | |
859 | if (i && string[i] == ':') | |
860 | i++; | |
861 | ||
862 | for (start = i; string[i] && string[i] != ':'; i++) | |
863 | ; | |
864 | ||
865 | *p_index = i; | |
866 | ||
867 | if (i == start) | |
868 | { | |
869 | if (string[i]) | |
870 | (*p_index)++; | |
871 | /* Return "" in the case of a trailing `:'. */ | |
f73dda09 | 872 | value = (char *)xmalloc (1); |
ccc6cda3 JA |
873 | value[0] = '\0'; |
874 | } | |
875 | else | |
bb70624e | 876 | value = substring (string, start, i); |
ccc6cda3 JA |
877 | |
878 | return (value); | |
726f6388 | 879 | } |
726f6388 JA |
880 | |
881 | /* **************************************************************** */ | |
882 | /* */ | |
883 | /* Tilde Initialization and Expansion */ | |
884 | /* */ | |
885 | /* **************************************************************** */ | |
886 | ||
cce855bc JA |
887 | #if defined (PUSHD_AND_POPD) |
888 | extern char *get_dirstack_from_string __P((char *)); | |
889 | #endif | |
890 | ||
f73dda09 | 891 | static char **bash_tilde_prefixes; |
22e63b05 | 892 | static char **bash_tilde_prefixes2; |
f73dda09 | 893 | static char **bash_tilde_suffixes; |
22e63b05 | 894 | static char **bash_tilde_suffixes2; |
f73dda09 | 895 | |
726f6388 JA |
896 | /* If tilde_expand hasn't been able to expand the text, perhaps it |
897 | is a special shell expansion. This function is installed as the | |
cce855bc JA |
898 | tilde_expansion_preexpansion_hook. It knows how to expand ~- and ~+. |
899 | If PUSHD_AND_POPD is defined, ~[+-]N expands to directories from the | |
900 | directory stack. */ | |
726f6388 | 901 | static char * |
d166f048 | 902 | bash_special_tilde_expansions (text) |
726f6388 JA |
903 | char *text; |
904 | { | |
ccc6cda3 | 905 | char *result; |
726f6388 | 906 | |
ccc6cda3 | 907 | result = (char *)NULL; |
cce855bc JA |
908 | |
909 | if (text[0] == '+' && text[1] == '\0') | |
910 | result = get_string_value ("PWD"); | |
911 | else if (text[0] == '-' && text[1] == '\0') | |
912 | result = get_string_value ("OLDPWD"); | |
913 | #if defined (PUSHD_AND_POPD) | |
f73dda09 | 914 | else if (DIGIT (*text) || ((*text == '+' || *text == '-') && DIGIT (text[1]))) |
cce855bc JA |
915 | result = get_dirstack_from_string (text); |
916 | #endif | |
726f6388 | 917 | |
ccc6cda3 | 918 | return (result ? savestring (result) : (char *)NULL); |
726f6388 JA |
919 | } |
920 | ||
921 | /* Initialize the tilde expander. In Bash, we handle `~-' and `~+', as | |
922 | well as handling special tilde prefixes; `:~" and `=~' are indications | |
923 | that we should do tilde expansion. */ | |
924 | void | |
925 | tilde_initialize () | |
926 | { | |
927 | static int times_called = 0; | |
928 | ||
d166f048 | 929 | /* Tell the tilde expander that we want a crack first. */ |
f73dda09 | 930 | tilde_expansion_preexpansion_hook = bash_special_tilde_expansions; |
726f6388 JA |
931 | |
932 | /* Tell the tilde expander about special strings which start a tilde | |
933 | expansion, and the special strings that end one. Only do this once. | |
934 | tilde_initialize () is called from within bashline_reinitialize (). */ | |
cce855bc | 935 | if (times_called++ == 0) |
726f6388 | 936 | { |
7117c2d2 | 937 | bash_tilde_prefixes = strvec_create (3); |
f73dda09 JA |
938 | bash_tilde_prefixes[0] = "=~"; |
939 | bash_tilde_prefixes[1] = ":~"; | |
940 | bash_tilde_prefixes[2] = (char *)NULL; | |
941 | ||
22e63b05 CR |
942 | bash_tilde_prefixes2 = strvec_create (2); |
943 | bash_tilde_prefixes2[0] = ":~"; | |
944 | bash_tilde_prefixes2[1] = (char *)NULL; | |
945 | ||
f73dda09 JA |
946 | tilde_additional_prefixes = bash_tilde_prefixes; |
947 | ||
7117c2d2 | 948 | bash_tilde_suffixes = strvec_create (3); |
f73dda09 JA |
949 | bash_tilde_suffixes[0] = ":"; |
950 | bash_tilde_suffixes[1] = "=~"; /* XXX - ?? */ | |
951 | bash_tilde_suffixes[2] = (char *)NULL; | |
952 | ||
953 | tilde_additional_suffixes = bash_tilde_suffixes; | |
22e63b05 CR |
954 | |
955 | bash_tilde_suffixes2 = strvec_create (2); | |
956 | bash_tilde_suffixes2[0] = ":"; | |
957 | bash_tilde_suffixes2[1] = (char *)NULL; | |
726f6388 | 958 | } |
726f6388 JA |
959 | } |
960 | ||
f73dda09 JA |
961 | /* POSIX.2, 3.6.1: A tilde-prefix consists of an unquoted tilde character |
962 | at the beginning of the word, followed by all of the characters preceding | |
963 | the first unquoted slash in the word, or all the characters in the word | |
964 | if there is no slash...If none of the characters in the tilde-prefix are | |
965 | quoted, the characters in the tilde-prefix following the tilde shell be | |
966 | treated as a possible login name. */ | |
967 | ||
968 | #define TILDE_END(c) ((c) == '\0' || (c) == '/' || (c) == ':') | |
969 | ||
970 | static int | |
971 | unquoted_tilde_word (s) | |
972 | const char *s; | |
973 | { | |
974 | const char *r; | |
975 | ||
976 | for (r = s; TILDE_END(*r) == 0; r++) | |
977 | { | |
978 | switch (*r) | |
979 | { | |
980 | case '\\': | |
981 | case '\'': | |
982 | case '"': | |
983 | return 0; | |
984 | } | |
985 | } | |
986 | return 1; | |
987 | } | |
988 | ||
22e63b05 CR |
989 | /* Find the end of the tilde-prefix starting at S, and return the tilde |
990 | prefix in newly-allocated memory. Return the length of the string in | |
991 | *LENP. FLAGS tells whether or not we're in an assignment context -- | |
992 | if so, `:' delimits the end of the tilde prefix as well. */ | |
993 | char * | |
994 | bash_tilde_find_word (s, flags, lenp) | |
995 | const char *s; | |
996 | int flags, *lenp; | |
997 | { | |
998 | const char *r; | |
999 | char *ret; | |
1000 | int l; | |
1001 | ||
1002 | for (r = s; *r && *r != '/'; r++) | |
1003 | { | |
1004 | /* Short-circuit immediately if we see a quote character. Even though | |
1005 | POSIX says that `the first unquoted slash' (or `:') terminates the | |
1006 | tilde-prefix, in practice, any quoted portion of the tilde prefix | |
1007 | will cause it to not be expanded. */ | |
1008 | if (*r == '\\' || *r == '\'' || *r == '"') | |
1009 | { | |
1010 | ret = savestring (s); | |
1011 | if (lenp) | |
1012 | *lenp = 0; | |
1013 | return ret; | |
1014 | } | |
1015 | else if (flags && *r == ':') | |
1016 | break; | |
1017 | } | |
1018 | l = r - s; | |
1019 | ret = xmalloc (l + 1); | |
1020 | strncpy (ret, s, l); | |
1021 | ret[l] = '\0'; | |
1022 | if (lenp) | |
1023 | *lenp = l; | |
1024 | return ret; | |
1025 | } | |
1026 | ||
7117c2d2 JA |
1027 | /* Tilde-expand S by running it through the tilde expansion library. |
1028 | ASSIGN_P is 1 if this is a variable assignment, so the alternate | |
22e63b05 CR |
1029 | tilde prefixes should be enabled (`=~' and `:~', see above). If |
1030 | ASSIGN_P is 2, we are expanding the rhs of an assignment statement, | |
1031 | so `=~' is not valid. */ | |
ccc6cda3 | 1032 | char * |
7117c2d2 | 1033 | bash_tilde_expand (s, assign_p) |
f73dda09 | 1034 | const char *s; |
7117c2d2 | 1035 | int assign_p; |
726f6388 | 1036 | { |
c92a890b | 1037 | int old_immed, old_term, r; |
ccc6cda3 | 1038 | char *ret; |
726f6388 | 1039 | |
ccc6cda3 | 1040 | old_immed = interrupt_immediately; |
c92a890b | 1041 | old_term = terminate_immediately; |
36eb585c CR |
1042 | /* We want to be able to interrupt tilde expansion. Ordinarily, we can just |
1043 | jump to top_level, but we don't want to run any trap commands in a signal | |
1044 | handler context. We might be able to get away with just checking for | |
1045 | things like SIGINT and SIGQUIT. */ | |
1046 | if (any_signals_trapped () < 0) | |
1047 | interrupt_immediately = 1; | |
1048 | terminate_immediately = 1; | |
22e63b05 CR |
1049 | |
1050 | tilde_additional_prefixes = assign_p == 0 ? (char **)0 | |
1051 | : (assign_p == 2 ? bash_tilde_prefixes2 : bash_tilde_prefixes); | |
1052 | if (assign_p == 2) | |
1053 | tilde_additional_suffixes = bash_tilde_suffixes2; | |
1054 | ||
f73dda09 JA |
1055 | r = (*s == '~') ? unquoted_tilde_word (s) : 1; |
1056 | ret = r ? tilde_expand (s) : savestring (s); | |
36eb585c | 1057 | |
ccc6cda3 | 1058 | interrupt_immediately = old_immed; |
c92a890b | 1059 | terminate_immediately = old_term; |
36eb585c CR |
1060 | |
1061 | QUIT; | |
1062 | ||
ccc6cda3 | 1063 | return (ret); |
726f6388 | 1064 | } |
d166f048 JA |
1065 | |
1066 | /* **************************************************************** */ | |
1067 | /* */ | |
1068 | /* Functions to manipulate and search the group list */ | |
1069 | /* */ | |
1070 | /* **************************************************************** */ | |
1071 | ||
1072 | static int ngroups, maxgroups; | |
1073 | ||
1074 | /* The set of groups that this user is a member of. */ | |
1075 | static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL; | |
1076 | ||
1077 | #if !defined (NOGROUP) | |
1078 | # define NOGROUP (gid_t) -1 | |
1079 | #endif | |
1080 | ||
d166f048 JA |
1081 | static void |
1082 | initialize_group_array () | |
1083 | { | |
1084 | register int i; | |
1085 | ||
1086 | if (maxgroups == 0) | |
1087 | maxgroups = getmaxgroups (); | |
1088 | ||
1089 | ngroups = 0; | |
1090 | group_array = (GETGROUPS_T *)xrealloc (group_array, maxgroups * sizeof (GETGROUPS_T)); | |
1091 | ||
1092 | #if defined (HAVE_GETGROUPS) | |
1093 | ngroups = getgroups (maxgroups, group_array); | |
1094 | #endif | |
1095 | ||
1096 | /* If getgroups returns nothing, or the OS does not support getgroups(), | |
1097 | make sure the groups array includes at least the current gid. */ | |
1098 | if (ngroups == 0) | |
1099 | { | |
1100 | group_array[0] = current_user.gid; | |
1101 | ngroups = 1; | |
1102 | } | |
1103 | ||
1104 | /* If the primary group is not in the groups array, add it as group_array[0] | |
1105 | and shuffle everything else up 1, if there's room. */ | |
1106 | for (i = 0; i < ngroups; i++) | |
1107 | if (current_user.gid == (gid_t)group_array[i]) | |
1108 | break; | |
1109 | if (i == ngroups && ngroups < maxgroups) | |
1110 | { | |
1111 | for (i = ngroups; i > 0; i--) | |
28ef6c31 | 1112 | group_array[i] = group_array[i - 1]; |
d166f048 JA |
1113 | group_array[0] = current_user.gid; |
1114 | ngroups++; | |
1115 | } | |
cce855bc JA |
1116 | |
1117 | /* If the primary group is not group_array[0], swap group_array[0] and | |
1118 | whatever the current group is. The vast majority of systems should | |
1119 | not need this; a notable exception is Linux. */ | |
1120 | if (group_array[0] != current_user.gid) | |
1121 | { | |
1122 | for (i = 0; i < ngroups; i++) | |
28ef6c31 JA |
1123 | if (group_array[i] == current_user.gid) |
1124 | break; | |
cce855bc JA |
1125 | if (i < ngroups) |
1126 | { | |
1127 | group_array[i] = group_array[0]; | |
1128 | group_array[0] = current_user.gid; | |
1129 | } | |
1130 | } | |
d166f048 JA |
1131 | } |
1132 | ||
1133 | /* Return non-zero if GID is one that we have in our groups list. */ | |
1134 | int | |
cce855bc JA |
1135 | #if defined (__STDC__) || defined ( _MINIX) |
1136 | group_member (gid_t gid) | |
1137 | #else | |
d166f048 JA |
1138 | group_member (gid) |
1139 | gid_t gid; | |
cce855bc | 1140 | #endif /* !__STDC__ && !_MINIX */ |
d166f048 JA |
1141 | { |
1142 | #if defined (HAVE_GETGROUPS) | |
1143 | register int i; | |
1144 | #endif | |
1145 | ||
1146 | /* Short-circuit if possible, maybe saving a call to getgroups(). */ | |
1147 | if (gid == current_user.gid || gid == current_user.egid) | |
1148 | return (1); | |
1149 | ||
1150 | #if defined (HAVE_GETGROUPS) | |
1151 | if (ngroups == 0) | |
1152 | initialize_group_array (); | |
1153 | ||
1154 | /* In case of error, the user loses. */ | |
1155 | if (ngroups <= 0) | |
1156 | return (0); | |
1157 | ||
1158 | /* Search through the list looking for GID. */ | |
1159 | for (i = 0; i < ngroups; i++) | |
1160 | if (gid == (gid_t)group_array[i]) | |
1161 | return (1); | |
1162 | #endif | |
1163 | ||
1164 | return (0); | |
1165 | } | |
1166 | ||
1167 | char ** | |
1168 | get_group_list (ngp) | |
1169 | int *ngp; | |
1170 | { | |
1171 | static char **group_vector = (char **)NULL; | |
1172 | register int i; | |
d166f048 JA |
1173 | |
1174 | if (group_vector) | |
1175 | { | |
1176 | if (ngp) | |
1177 | *ngp = ngroups; | |
1178 | return group_vector; | |
1179 | } | |
1180 | ||
1181 | if (ngroups == 0) | |
1182 | initialize_group_array (); | |
1183 | ||
1184 | if (ngroups <= 0) | |
1185 | { | |
1186 | if (ngp) | |
1187 | *ngp = 0; | |
1188 | return (char **)NULL; | |
1189 | } | |
1190 | ||
7117c2d2 | 1191 | group_vector = strvec_create (ngroups); |
d166f048 | 1192 | for (i = 0; i < ngroups; i++) |
7117c2d2 | 1193 | group_vector[i] = itos (group_array[i]); |
b72432fd | 1194 | |
d166f048 JA |
1195 | if (ngp) |
1196 | *ngp = ngroups; | |
1197 | return group_vector; | |
1198 | } | |
b72432fd JA |
1199 | |
1200 | int * | |
1201 | get_group_array (ngp) | |
1202 | int *ngp; | |
1203 | { | |
1204 | int i; | |
1205 | static int *group_iarray = (int *)NULL; | |
1206 | ||
1207 | if (group_iarray) | |
1208 | { | |
1209 | if (ngp) | |
1210 | *ngp = ngroups; | |
1211 | return (group_iarray); | |
1212 | } | |
1213 | ||
1214 | if (ngroups == 0) | |
1215 | initialize_group_array (); | |
1216 | ||
1217 | if (ngroups <= 0) | |
1218 | { | |
1219 | if (ngp) | |
1220 | *ngp = 0; | |
1221 | return (int *)NULL; | |
1222 | } | |
1223 | ||
1224 | group_iarray = (int *)xmalloc (ngroups * sizeof (int)); | |
1225 | for (i = 0; i < ngroups; i++) | |
1226 | group_iarray[i] = (int)group_array[i]; | |
1227 | ||
1228 | if (ngp) | |
1229 | *ngp = ngroups; | |
1230 | return group_iarray; | |
1231 | } | |
1573ba78 CR |
1232 | |
1233 | /* **************************************************************** */ | |
1234 | /* */ | |
1235 | /* Miscellaneous functions */ | |
1236 | /* */ | |
1237 | /* **************************************************************** */ | |
1238 | ||
1239 | /* Return a value for PATH that is guaranteed to find all of the standard | |
1240 | utilities. This uses Posix.2 configuration variables, if present. It | |
1241 | uses a value defined in config.h as a last resort. */ | |
1242 | char * | |
1243 | conf_standard_path () | |
1244 | { | |
1245 | #if defined (_CS_PATH) && defined (HAVE_CONFSTR) | |
1246 | char *p; | |
1247 | size_t len; | |
1248 | ||
1249 | len = (size_t)confstr (_CS_PATH, (char *)NULL, (size_t)0); | |
1250 | if (len > 0) | |
1251 | { | |
1252 | p = (char *)xmalloc (len + 2); | |
1253 | *p = '\0'; | |
1254 | confstr (_CS_PATH, p, len); | |
1255 | return (p); | |
1256 | } | |
1257 | else | |
1258 | return (savestring (STANDARD_UTILS_PATH)); | |
1259 | #else /* !_CS_PATH || !HAVE_CONFSTR */ | |
1260 | # if defined (CS_PATH) | |
1261 | return (savestring (CS_PATH)); | |
1262 | # else | |
1263 | return (savestring (STANDARD_UTILS_PATH)); | |
1264 | # endif /* !CS_PATH */ | |
1265 | #endif /* !_CS_PATH || !HAVE_CONFSTR */ | |
1266 | } |