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Commit | Line | Data |
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726f6388 JA |
1 | /* general.c -- Stuff that is used by all files. */ |
2 | ||
a4eef199 | 3 | /* Copyright (C) 1987-2016 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; |
690150f9 | 61 | extern int inherit_errexit; |
cce855bc | 62 | |
7117c2d2 JA |
63 | static char *bash_special_tilde_expansions __P((char *)); |
64 | static int unquoted_tilde_word __P((const char *)); | |
65 | static void initialize_group_array __P((void)); | |
66 | ||
cce855bc | 67 | /* A standard error message to use when getcwd() returns NULL. */ |
d3ad40de | 68 | const char * const bash_getcwd_errstr = N_("getcwd: cannot access parent directories"); |
726f6388 | 69 | |
ccc6cda3 | 70 | /* Do whatever is necessary to initialize `Posix mode'. */ |
726f6388 | 71 | void |
ccc6cda3 JA |
72 | posix_initialize (on) |
73 | int on; | |
726f6388 | 74 | { |
28ef6c31 JA |
75 | /* Things that should be turned on when posix mode is enabled. */ |
76 | if (on != 0) | |
77 | { | |
78 | interactive_comments = source_uses_path = expand_aliases = 1; | |
690150f9 | 79 | inherit_errexit = 1; |
5b8e93e5 | 80 | source_searches_cwd = 0; |
28ef6c31 JA |
81 | } |
82 | ||
83 | /* Things that should be turned on when posix mode is disabled. */ | |
84 | if (on == 0) | |
85 | { | |
86 | source_searches_cwd = 1; | |
87 | expand_aliases = interactive_shell; | |
88 | } | |
726f6388 JA |
89 | } |
90 | ||
ccc6cda3 JA |
91 | /* **************************************************************** */ |
92 | /* */ | |
93 | /* Functions to convert to and from and display non-standard types */ | |
94 | /* */ | |
95 | /* **************************************************************** */ | |
96 | ||
726f6388 JA |
97 | #if defined (RLIMTYPE) |
98 | RLIMTYPE | |
99 | string_to_rlimtype (s) | |
100 | char *s; | |
101 | { | |
cce855bc JA |
102 | RLIMTYPE ret; |
103 | int neg; | |
726f6388 | 104 | |
cce855bc JA |
105 | ret = 0; |
106 | neg = 0; | |
726f6388 JA |
107 | while (s && *s && whitespace (*s)) |
108 | s++; | |
824dfe68 | 109 | if (s && (*s == '-' || *s == '+')) |
726f6388 JA |
110 | { |
111 | neg = *s == '-'; | |
112 | s++; | |
113 | } | |
f73dda09 JA |
114 | for ( ; s && *s && DIGIT (*s); s++) |
115 | ret = (ret * 10) + TODIGIT (*s); | |
726f6388 JA |
116 | return (neg ? -ret : ret); |
117 | } | |
118 | ||
119 | void | |
120 | print_rlimtype (n, addnl) | |
121 | RLIMTYPE n; | |
122 | int addnl; | |
123 | { | |
f73dda09 | 124 | char s[INT_STRLEN_BOUND (RLIMTYPE) + 1], *p; |
726f6388 | 125 | |
f73dda09 JA |
126 | p = s + sizeof(s); |
127 | *--p = '\0'; | |
726f6388 JA |
128 | |
129 | if (n < 0) | |
130 | { | |
f73dda09 JA |
131 | do |
132 | *--p = '0' - n % 10; | |
133 | while ((n /= 10) != 0); | |
134 | ||
135 | *--p = '-'; | |
136 | } | |
137 | else | |
138 | { | |
139 | do | |
140 | *--p = '0' + n % 10; | |
141 | while ((n /= 10) != 0); | |
726f6388 JA |
142 | } |
143 | ||
f73dda09 | 144 | printf ("%s%s", p, addnl ? "\n" : ""); |
726f6388 JA |
145 | } |
146 | #endif /* RLIMTYPE */ | |
147 | ||
ccc6cda3 JA |
148 | /* **************************************************************** */ |
149 | /* */ | |
150 | /* Input Validation Functions */ | |
151 | /* */ | |
152 | /* **************************************************************** */ | |
153 | ||
154 | /* Return non-zero if all of the characters in STRING are digits. */ | |
155 | int | |
156 | all_digits (string) | |
157 | char *string; | |
158 | { | |
28ef6c31 JA |
159 | register char *s; |
160 | ||
161 | for (s = string; *s; s++) | |
f73dda09 | 162 | if (DIGIT (*s) == 0) |
28ef6c31 JA |
163 | return (0); |
164 | ||
ccc6cda3 JA |
165 | return (1); |
166 | } | |
167 | ||
168 | /* Return non-zero if the characters pointed to by STRING constitute a | |
169 | valid number. Stuff the converted number into RESULT if RESULT is | |
f73dda09 | 170 | not null. */ |
ccc6cda3 JA |
171 | int |
172 | legal_number (string, result) | |
d3ad40de | 173 | const char *string; |
7117c2d2 | 174 | intmax_t *result; |
ccc6cda3 | 175 | { |
7117c2d2 | 176 | intmax_t value; |
cce855bc | 177 | char *ep; |
ccc6cda3 JA |
178 | |
179 | if (result) | |
180 | *result = 0; | |
181 | ||
631b20c6 CR |
182 | if (string == 0) |
183 | return 0; | |
184 | ||
f73dda09 | 185 | errno = 0; |
7117c2d2 | 186 | value = strtoimax (string, &ep, 10); |
48ff5447 | 187 | if (errno || ep == string) |
f73dda09 | 188 | return 0; /* errno is set on overflow or underflow */ |
ccc6cda3 | 189 | |
7117c2d2 | 190 | /* Skip any trailing whitespace, since strtoimax does not. */ |
28ef6c31 JA |
191 | while (whitespace (*ep)) |
192 | ep++; | |
193 | ||
cce855bc JA |
194 | /* If *string is not '\0' but *ep is '\0' on return, the entire string |
195 | is valid. */ | |
631b20c6 | 196 | if (*string && *ep == '\0') |
ccc6cda3 JA |
197 | { |
198 | if (result) | |
cce855bc JA |
199 | *result = value; |
200 | /* The SunOS4 implementation of strtol() will happily ignore | |
201 | overflow conditions, so this cannot do overflow correctly | |
202 | on those systems. */ | |
203 | return 1; | |
ccc6cda3 | 204 | } |
cce855bc JA |
205 | |
206 | return (0); | |
ccc6cda3 JA |
207 | } |
208 | ||
726f6388 JA |
209 | /* Return 1 if this token is a legal shell `identifier'; that is, it consists |
210 | solely of letters, digits, and underscores, and does not begin with a | |
211 | digit. */ | |
212 | int | |
213 | legal_identifier (name) | |
214 | char *name; | |
215 | { | |
216 | register char *s; | |
f73dda09 | 217 | unsigned char c; |
726f6388 | 218 | |
f73dda09 | 219 | if (!name || !(c = *name) || (legal_variable_starter (c) == 0)) |
726f6388 JA |
220 | return (0); |
221 | ||
f73dda09 | 222 | for (s = name + 1; (c = *s) != 0; s++) |
726f6388 | 223 | { |
f73dda09 | 224 | if (legal_variable_char (c) == 0) |
28ef6c31 | 225 | return (0); |
726f6388 JA |
226 | } |
227 | return (1); | |
228 | } | |
229 | ||
a4eef199 CR |
230 | /* Return 1 if NAME is a valid value that can be assigned to a nameref |
231 | variable. FLAGS can be 2, in which case the name is going to be used | |
232 | to create a variable. Other values are currently unused, but could | |
233 | be used to allow values to be stored and indirectly referenced, but | |
234 | not used in assignments. */ | |
235 | int | |
236 | valid_nameref_value (name, flags) | |
237 | char *name; | |
238 | int flags; | |
239 | { | |
240 | if (name == 0 || *name == 0) | |
241 | return 0; | |
242 | ||
243 | /* valid identifier */ | |
244 | #if defined (ARRAY_VARS) | |
245 | if (legal_identifier (name) || (flags != 2 && valid_array_reference (name, 0))) | |
246 | #else | |
247 | if (legal_identifier (name)) | |
248 | #endif | |
249 | return 1; | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | int | |
255 | check_selfref (name, value, flags) | |
256 | const char *name; | |
257 | const char *value; | |
258 | int flags; | |
259 | { | |
260 | char *t; | |
261 | ||
262 | if (STREQ (name, value)) | |
263 | return 1; | |
264 | ||
265 | #if defined (ARRAY_VARS) | |
266 | if (valid_array_reference (value, 0)) | |
267 | { | |
268 | t = array_variable_name (value, (int *)NULL, (int *)NULL); | |
269 | if (t && STREQ (name, t)) | |
270 | { | |
271 | free (t); | |
272 | return 1; | |
273 | } | |
274 | free (t); | |
275 | } | |
276 | #endif | |
277 | ||
278 | return 0; /* not a self reference */ | |
279 | } | |
280 | ||
726f6388 JA |
281 | /* Make sure that WORD is a valid shell identifier, i.e. |
282 | does not contain a dollar sign, nor is quoted in any way. Nor | |
283 | does it consist of all digits. If CHECK_WORD is non-zero, | |
284 | the word is checked to ensure that it consists of only letters, | |
285 | digits, and underscores. */ | |
ccc6cda3 | 286 | int |
726f6388 JA |
287 | check_identifier (word, check_word) |
288 | WORD_DESC *word; | |
289 | int check_word; | |
290 | { | |
ccc6cda3 | 291 | if ((word->flags & (W_HASDOLLAR|W_QUOTED)) || all_digits (word->word)) |
726f6388 | 292 | { |
5e13499c | 293 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
294 | return (0); |
295 | } | |
296 | else if (check_word && legal_identifier (word->word) == 0) | |
297 | { | |
5e13499c | 298 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
299 | return (0); |
300 | } | |
301 | else | |
302 | return (1); | |
303 | } | |
304 | ||
613d4ba4 CR |
305 | /* Return 1 if STRING is a function name that the shell will import from |
306 | the environment. Currently we reject attempts to import shell functions | |
307 | containing slashes, beginning with newlines or containing blanks. In | |
308 | Posix mode, we require that STRING be a valid shell identifier. Not | |
309 | used yet. */ | |
30595b57 | 310 | int |
613d4ba4 | 311 | importable_function_name (string, len) |
30595b57 | 312 | char *string; |
613d4ba4 | 313 | size_t len; |
30595b57 CR |
314 | { |
315 | if (absolute_program (string)) /* don't allow slash */ | |
316 | return 0; | |
613d4ba4 CR |
317 | if (*string == '\n') /* can't start with a newline */ |
318 | return 0; | |
319 | if (shellblank (*string) || shellblank(string[len-1])) | |
320 | return 0; | |
30595b57 CR |
321 | return (posixly_correct ? legal_identifier (string) : 1); |
322 | } | |
323 | ||
613d4ba4 CR |
324 | int |
325 | exportable_function_name (string) | |
326 | char *string; | |
327 | { | |
328 | if (absolute_program (string)) | |
329 | return 0; | |
330 | if (mbschr (string, '=') != 0) | |
331 | return 0; | |
332 | return 1; | |
333 | } | |
334 | ||
1d7ecd77 CR |
335 | /* Return 1 if STRING comprises a valid alias name. The shell accepts |
336 | essentially all characters except those which must be quoted to the | |
337 | parser (which disqualifies them from alias expansion anyway) and `/'. */ | |
338 | int | |
339 | legal_alias_name (string, flags) | |
340 | char *string; | |
341 | int flags; | |
342 | { | |
343 | register char *s; | |
344 | ||
345 | for (s = string; *s; s++) | |
346 | if (shellbreak (*s) || shellxquote (*s) || shellexp (*s) || (*s == '/')) | |
347 | return 0; | |
348 | return 1; | |
349 | } | |
350 | ||
7117c2d2 JA |
351 | /* Returns non-zero if STRING is an assignment statement. The returned value |
352 | is the index of the `=' sign. */ | |
353 | int | |
5e13499c | 354 | assignment (string, flags) |
7117c2d2 | 355 | const char *string; |
5e13499c | 356 | int flags; |
7117c2d2 JA |
357 | { |
358 | register unsigned char c; | |
359 | register int newi, indx; | |
360 | ||
361 | c = string[indx = 0]; | |
362 | ||
5e13499c | 363 | #if defined (ARRAY_VARS) |
c3271763 | 364 | if ((legal_variable_starter (c) == 0) && (flags == 0 || c != '[')) /* ] */ |
5e13499c | 365 | #else |
7117c2d2 | 366 | if (legal_variable_starter (c) == 0) |
5e13499c | 367 | #endif |
7117c2d2 JA |
368 | return (0); |
369 | ||
370 | while (c = string[indx]) | |
371 | { | |
372 | /* The following is safe. Note that '=' at the start of a word | |
373 | is not an assignment statement. */ | |
374 | if (c == '=') | |
375 | return (indx); | |
376 | ||
377 | #if defined (ARRAY_VARS) | |
378 | if (c == '[') | |
379 | { | |
3eb2d94a | 380 | newi = skipsubscript (string, indx, 0); |
7117c2d2 JA |
381 | if (string[newi++] != ']') |
382 | return (0); | |
d11b8b46 CR |
383 | if (string[newi] == '+' && string[newi+1] == '=') |
384 | return (newi + 1); | |
7117c2d2 JA |
385 | return ((string[newi] == '=') ? newi : 0); |
386 | } | |
387 | #endif /* ARRAY_VARS */ | |
388 | ||
d11b8b46 CR |
389 | /* Check for `+=' */ |
390 | if (c == '+' && string[indx+1] == '=') | |
391 | return (indx + 1); | |
392 | ||
7117c2d2 JA |
393 | /* Variable names in assignment statements may contain only letters, |
394 | digits, and `_'. */ | |
395 | if (legal_variable_char (c) == 0) | |
396 | return (0); | |
397 | ||
398 | indx++; | |
399 | } | |
400 | return (0); | |
401 | } | |
402 | ||
ccc6cda3 JA |
403 | /* **************************************************************** */ |
404 | /* */ | |
405 | /* Functions to manage files and file descriptors */ | |
406 | /* */ | |
407 | /* **************************************************************** */ | |
408 | ||
726f6388 JA |
409 | /* A function to unset no-delay mode on a file descriptor. Used in shell.c |
410 | to unset it on the fd passed as stdin. Should be called on stdin if | |
411 | readline gets an EAGAIN or EWOULDBLOCK when trying to read input. */ | |
412 | ||
413 | #if !defined (O_NDELAY) | |
414 | # if defined (FNDELAY) | |
415 | # define O_NDELAY FNDELAY | |
416 | # endif | |
417 | #endif /* O_NDELAY */ | |
418 | ||
419 | /* Make sure no-delay mode is not set on file descriptor FD. */ | |
bb70624e | 420 | int |
28ef6c31 | 421 | sh_unset_nodelay_mode (fd) |
726f6388 JA |
422 | int fd; |
423 | { | |
bb70624e | 424 | int flags, bflags; |
726f6388 JA |
425 | |
426 | if ((flags = fcntl (fd, F_GETFL, 0)) < 0) | |
bb70624e | 427 | return -1; |
726f6388 | 428 | |
bb70624e | 429 | bflags = 0; |
ccc6cda3 JA |
430 | |
431 | /* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present | |
432 | and O_NDELAY is defined. */ | |
bb70624e JA |
433 | #ifdef O_NONBLOCK |
434 | bflags |= O_NONBLOCK; | |
435 | #endif | |
436 | ||
437 | #ifdef O_NDELAY | |
438 | bflags |= O_NDELAY; | |
439 | #endif | |
440 | ||
441 | if (flags & bflags) | |
726f6388 | 442 | { |
bb70624e JA |
443 | flags &= ~bflags; |
444 | return (fcntl (fd, F_SETFL, flags)); | |
726f6388 | 445 | } |
726f6388 | 446 | |
bb70624e | 447 | return 0; |
726f6388 JA |
448 | } |
449 | ||
7117c2d2 JA |
450 | /* Return 1 if file descriptor FD is valid; 0 otherwise. */ |
451 | int | |
452 | sh_validfd (fd) | |
453 | int fd; | |
454 | { | |
455 | return (fcntl (fd, F_GETFD, 0) >= 0); | |
456 | } | |
457 | ||
510e20a2 CR |
458 | int |
459 | fd_ispipe (fd) | |
460 | int fd; | |
461 | { | |
462 | errno = 0; | |
34ec1876 | 463 | return ((lseek (fd, 0L, SEEK_CUR) < 0) && (errno == ESPIPE)); |
510e20a2 CR |
464 | } |
465 | ||
b72432fd JA |
466 | /* There is a bug in the NeXT 2.1 rlogind that causes opens |
467 | of /dev/tty to fail. */ | |
468 | ||
469 | #if defined (__BEOS__) | |
470 | /* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it | |
471 | into a no-op. This should probably go away in the future. */ | |
472 | # undef O_NONBLOCK | |
473 | # define O_NONBLOCK 0 | |
474 | #endif /* __BEOS__ */ | |
475 | ||
726f6388 | 476 | void |
ccc6cda3 | 477 | check_dev_tty () |
726f6388 | 478 | { |
ccc6cda3 JA |
479 | int tty_fd; |
480 | char *tty; | |
726f6388 | 481 | |
d166f048 | 482 | tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK); |
726f6388 | 483 | |
ccc6cda3 | 484 | if (tty_fd < 0) |
726f6388 | 485 | { |
ccc6cda3 JA |
486 | tty = (char *)ttyname (fileno (stdin)); |
487 | if (tty == 0) | |
488 | return; | |
d166f048 | 489 | tty_fd = open (tty, O_RDWR|O_NONBLOCK); |
726f6388 | 490 | } |
631b20c6 CR |
491 | if (tty_fd >= 0) |
492 | close (tty_fd); | |
726f6388 JA |
493 | } |
494 | ||
ccc6cda3 JA |
495 | /* Return 1 if PATH1 and PATH2 are the same file. This is kind of |
496 | expensive. If non-NULL STP1 and STP2 point to stat structures | |
497 | corresponding to PATH1 and PATH2, respectively. */ | |
726f6388 | 498 | int |
ccc6cda3 JA |
499 | same_file (path1, path2, stp1, stp2) |
500 | char *path1, *path2; | |
501 | struct stat *stp1, *stp2; | |
726f6388 | 502 | { |
ccc6cda3 | 503 | struct stat st1, st2; |
726f6388 | 504 | |
ccc6cda3 | 505 | if (stp1 == NULL) |
726f6388 | 506 | { |
ccc6cda3 JA |
507 | if (stat (path1, &st1) != 0) |
508 | return (0); | |
509 | stp1 = &st1; | |
726f6388 | 510 | } |
726f6388 | 511 | |
ccc6cda3 JA |
512 | if (stp2 == NULL) |
513 | { | |
514 | if (stat (path2, &st2) != 0) | |
515 | return (0); | |
516 | stp2 = &st2; | |
517 | } | |
726f6388 | 518 | |
ccc6cda3 | 519 | return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino)); |
726f6388 JA |
520 | } |
521 | ||
ccc6cda3 JA |
522 | /* Move FD to a number close to the maximum number of file descriptors |
523 | allowed in the shell process, to avoid the user stepping on it with | |
524 | redirection and causing us extra work. If CHECK_NEW is non-zero, | |
525 | we check whether or not the file descriptors are in use before | |
d166f048 JA |
526 | duplicating FD onto them. MAXFD says where to start checking the |
527 | file descriptors. If it's less than 20, we get the maximum value | |
528 | available from getdtablesize(2). */ | |
726f6388 | 529 | int |
d166f048 JA |
530 | move_to_high_fd (fd, check_new, maxfd) |
531 | int fd, check_new, maxfd; | |
726f6388 | 532 | { |
ccc6cda3 | 533 | int script_fd, nfds, ignore; |
726f6388 | 534 | |
d166f048 JA |
535 | if (maxfd < 20) |
536 | { | |
537 | nfds = getdtablesize (); | |
538 | if (nfds <= 0) | |
539 | nfds = 20; | |
7117c2d2 JA |
540 | if (nfds > HIGH_FD_MAX) |
541 | nfds = HIGH_FD_MAX; /* reasonable maximum */ | |
d166f048 JA |
542 | } |
543 | else | |
544 | nfds = maxfd; | |
726f6388 | 545 | |
ccc6cda3 JA |
546 | for (nfds--; check_new && nfds > 3; nfds--) |
547 | if (fcntl (nfds, F_GETFD, &ignore) == -1) | |
548 | break; | |
726f6388 | 549 | |
7117c2d2 | 550 | if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1) |
ccc6cda3 JA |
551 | { |
552 | if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */ | |
553 | close (fd); | |
554 | return (script_fd); | |
555 | } | |
726f6388 | 556 | |
7117c2d2 JA |
557 | /* OK, we didn't find one less than our artificial maximum; return the |
558 | original file descriptor. */ | |
ccc6cda3 JA |
559 | return (fd); |
560 | } | |
561 | ||
562 | /* Return non-zero if the characters from SAMPLE are not all valid | |
563 | characters to be found in the first line of a shell script. We | |
564 | check up to the first newline, or SAMPLE_LEN, whichever comes first. | |
565 | All of the characters must be printable or whitespace. */ | |
726f6388 | 566 | |
726f6388 | 567 | int |
ccc6cda3 | 568 | check_binary_file (sample, sample_len) |
f73dda09 | 569 | char *sample; |
ccc6cda3 | 570 | int sample_len; |
726f6388 | 571 | { |
ccc6cda3 | 572 | register int i; |
f73dda09 | 573 | unsigned char c; |
726f6388 | 574 | |
ccc6cda3 JA |
575 | for (i = 0; i < sample_len; i++) |
576 | { | |
f73dda09 JA |
577 | c = sample[i]; |
578 | if (c == '\n') | |
ccc6cda3 | 579 | return (0); |
74d9692b | 580 | if (c == '\0') |
ccc6cda3 JA |
581 | return (1); |
582 | } | |
726f6388 | 583 | |
ccc6cda3 | 584 | return (0); |
726f6388 JA |
585 | } |
586 | ||
4ac1ff98 CR |
587 | /* **************************************************************** */ |
588 | /* */ | |
589 | /* Functions to manipulate pipes */ | |
590 | /* */ | |
591 | /* **************************************************************** */ | |
592 | ||
593 | int | |
594 | sh_openpipe (pv) | |
595 | int *pv; | |
596 | { | |
597 | int r; | |
598 | ||
599 | if ((r = pipe (pv)) < 0) | |
600 | return r; | |
601 | ||
602 | pv[0] = move_to_high_fd (pv[0], 1, 64); | |
603 | pv[1] = move_to_high_fd (pv[1], 1, 64); | |
604 | ||
605 | return 0; | |
606 | } | |
607 | ||
608 | int | |
609 | sh_closepipe (pv) | |
610 | int *pv; | |
611 | { | |
612 | if (pv[0] >= 0) | |
613 | close (pv[0]); | |
614 | ||
615 | if (pv[1] >= 0) | |
616 | close (pv[1]); | |
617 | ||
618 | pv[0] = pv[1] = -1; | |
619 | return 0; | |
620 | } | |
621 | ||
fb65be05 CR |
622 | /* **************************************************************** */ |
623 | /* */ | |
624 | /* Functions to inspect pathnames */ | |
625 | /* */ | |
626 | /* **************************************************************** */ | |
627 | ||
a9fac3b2 CR |
628 | int |
629 | file_exists (fn) | |
630 | char *fn; | |
631 | { | |
632 | struct stat sb; | |
633 | ||
634 | return (stat (fn, &sb) == 0); | |
635 | } | |
636 | ||
fb65be05 CR |
637 | int |
638 | file_isdir (fn) | |
639 | char *fn; | |
640 | { | |
641 | struct stat sb; | |
642 | ||
643 | return ((stat (fn, &sb) == 0) && S_ISDIR (sb.st_mode)); | |
644 | } | |
645 | ||
646 | int | |
647 | file_iswdir (fn) | |
648 | char *fn; | |
649 | { | |
ac18b312 | 650 | return (file_isdir (fn) && sh_eaccess (fn, W_OK) == 0); |
fb65be05 CR |
651 | } |
652 | ||
510e20a2 CR |
653 | /* Return 1 if STRING is "." or "..", optionally followed by a directory |
654 | separator */ | |
655 | int | |
3d4f66ca | 656 | path_dot_or_dotdot (string) |
510e20a2 CR |
657 | const char *string; |
658 | { | |
659 | if (string == 0 || *string == '\0' || *string != '.') | |
660 | return (0); | |
661 | ||
662 | /* string[0] == '.' */ | |
663 | if (PATHSEP(string[1]) || (string[1] == '.' && PATHSEP(string[2]))) | |
664 | return (1); | |
665 | ||
666 | return (0); | |
667 | } | |
668 | ||
ff247e74 CR |
669 | /* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd' |
670 | to decide whether or not to look up a directory name in $CDPATH. */ | |
671 | int | |
672 | absolute_pathname (string) | |
673 | const char *string; | |
674 | { | |
675 | if (string == 0 || *string == '\0') | |
676 | return (0); | |
677 | ||
678 | if (ABSPATH(string)) | |
679 | return (1); | |
680 | ||
681 | if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */ | |
682 | return (1); | |
683 | ||
684 | if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */ | |
685 | return (1); | |
686 | ||
687 | return (0); | |
688 | } | |
689 | ||
690 | /* Return 1 if STRING is an absolute program name; it is absolute if it | |
691 | contains any slashes. This is used to decide whether or not to look | |
692 | up through $PATH. */ | |
693 | int | |
694 | absolute_program (string) | |
695 | const char *string; | |
696 | { | |
d0ca3503 | 697 | return ((char *)mbschr (string, '/') != (char *)NULL); |
ff247e74 | 698 | } |
fb65be05 | 699 | |
ccc6cda3 JA |
700 | /* **************************************************************** */ |
701 | /* */ | |
702 | /* Functions to manipulate pathnames */ | |
703 | /* */ | |
704 | /* **************************************************************** */ | |
726f6388 | 705 | |
726f6388 JA |
706 | /* Turn STRING (a pathname) into an absolute pathname, assuming that |
707 | DOT_PATH contains the symbolic location of `.'. This always | |
708 | returns a new string, even if STRING was an absolute pathname to | |
709 | begin with. */ | |
710 | char * | |
711 | make_absolute (string, dot_path) | |
712 | char *string, *dot_path; | |
713 | { | |
714 | char *result; | |
ccc6cda3 | 715 | |
28ef6c31 | 716 | if (dot_path == 0 || ABSPATH(string)) |
d3a24ed2 CR |
717 | #ifdef __CYGWIN__ |
718 | { | |
719 | char pathbuf[PATH_MAX + 1]; | |
720 | ||
721 | cygwin_conv_to_full_posix_path (string, pathbuf); | |
722 | result = savestring (pathbuf); | |
723 | } | |
724 | #else | |
726f6388 | 725 | result = savestring (string); |
d3a24ed2 | 726 | #endif |
726f6388 | 727 | else |
bb70624e | 728 | result = sh_makepath (dot_path, string, 0); |
726f6388 JA |
729 | |
730 | return (result); | |
731 | } | |
732 | ||
726f6388 | 733 | /* Return the `basename' of the pathname in STRING (the stuff after the |
898cc92e | 734 | last '/'). If STRING is `/', just return it. */ |
726f6388 JA |
735 | char * |
736 | base_pathname (string) | |
737 | char *string; | |
738 | { | |
739 | char *p; | |
740 | ||
898cc92e | 741 | #if 0 |
28ef6c31 | 742 | if (absolute_pathname (string) == 0) |
726f6388 | 743 | return (string); |
898cc92e CR |
744 | #endif |
745 | ||
746 | if (string[0] == '/' && string[1] == 0) | |
747 | return (string); | |
726f6388 JA |
748 | |
749 | p = (char *)strrchr (string, '/'); | |
ccc6cda3 | 750 | return (p ? ++p : string); |
726f6388 JA |
751 | } |
752 | ||
753 | /* Return the full pathname of FILE. Easy. Filenames that begin | |
754 | with a '/' are returned as themselves. Other filenames have | |
755 | the current working directory prepended. A new string is | |
756 | returned in either case. */ | |
757 | char * | |
758 | full_pathname (file) | |
759 | char *file; | |
760 | { | |
bb70624e | 761 | char *ret; |
726f6388 | 762 | |
7117c2d2 | 763 | file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file); |
726f6388 | 764 | |
28ef6c31 | 765 | if (ABSPATH(file)) |
726f6388 JA |
766 | return (file); |
767 | ||
bb70624e JA |
768 | ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT)); |
769 | free (file); | |
726f6388 | 770 | |
bb70624e | 771 | return (ret); |
726f6388 | 772 | } |
726f6388 JA |
773 | |
774 | /* A slightly related function. Get the prettiest name of this | |
775 | directory possible. */ | |
ccc6cda3 | 776 | static char tdir[PATH_MAX]; |
726f6388 JA |
777 | |
778 | /* Return a pretty pathname. If the first part of the pathname is | |
779 | the same as $HOME, then replace that with `~'. */ | |
780 | char * | |
781 | polite_directory_format (name) | |
782 | char *name; | |
783 | { | |
ccc6cda3 JA |
784 | char *home; |
785 | int l; | |
726f6388 | 786 | |
ccc6cda3 JA |
787 | home = get_string_value ("HOME"); |
788 | l = home ? strlen (home) : 0; | |
726f6388 JA |
789 | if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/')) |
790 | { | |
e8ce775d | 791 | strncpy (tdir + 1, name + l, sizeof(tdir) - 2); |
726f6388 | 792 | tdir[0] = '~'; |
e8ce775d | 793 | tdir[sizeof(tdir) - 1] = '\0'; |
726f6388 JA |
794 | return (tdir); |
795 | } | |
796 | else | |
797 | return (name); | |
798 | } | |
799 | ||
4ac1ff98 CR |
800 | /* Trim NAME. If NAME begins with `~/', skip over tilde prefix. Trim to |
801 | keep any tilde prefix and PROMPT_DIRTRIM trailing directory components | |
802 | and replace the intervening characters with `...' */ | |
803 | char * | |
804 | trim_pathname (name, maxlen) | |
805 | char *name; | |
806 | int maxlen; | |
807 | { | |
808 | int nlen, ndirs; | |
809 | intmax_t nskip; | |
810 | char *nbeg, *nend, *ntail, *v; | |
811 | ||
812 | if (name == 0 || (nlen = strlen (name)) == 0) | |
813 | return name; | |
814 | nend = name + nlen; | |
815 | ||
816 | v = get_string_value ("PROMPT_DIRTRIM"); | |
817 | if (v == 0 || *v == 0) | |
818 | return name; | |
819 | if (legal_number (v, &nskip) == 0 || nskip <= 0) | |
820 | return name; | |
821 | ||
822 | /* Skip over tilde prefix */ | |
823 | nbeg = name; | |
824 | if (name[0] == '~') | |
825 | for (nbeg = name; *nbeg; nbeg++) | |
826 | if (*nbeg == '/') | |
827 | { | |
828 | nbeg++; | |
829 | break; | |
830 | } | |
831 | if (*nbeg == 0) | |
832 | return name; | |
833 | ||
834 | for (ndirs = 0, ntail = nbeg; *ntail; ntail++) | |
835 | if (*ntail == '/') | |
836 | ndirs++; | |
f486d0a1 | 837 | if (ndirs < nskip) |
4ac1ff98 CR |
838 | return name; |
839 | ||
840 | for (ntail = (*nend == '/') ? nend : nend - 1; ntail > nbeg; ntail--) | |
841 | { | |
842 | if (*ntail == '/') | |
843 | nskip--; | |
844 | if (nskip == 0) | |
845 | break; | |
846 | } | |
847 | if (ntail == nbeg) | |
848 | return name; | |
849 | ||
850 | /* Now we want to return name[0..nbeg]+"..."+ntail, modifying name in place */ | |
851 | nlen = ntail - nbeg; | |
852 | if (nlen <= 3) | |
853 | return name; | |
854 | ||
855 | *nbeg++ = '.'; | |
856 | *nbeg++ = '.'; | |
857 | *nbeg++ = '.'; | |
858 | ||
859 | nlen = nend - ntail; | |
c2fa6583 | 860 | memmove (nbeg, ntail, nlen); |
4ac1ff98 CR |
861 | nbeg[nlen] = '\0'; |
862 | ||
863 | return name; | |
864 | } | |
865 | ||
96f3fb66 CR |
866 | /* Return a printable representation of FN without special characters. The |
867 | caller is responsible for freeing memory if this returns something other | |
868 | than its argument. If FLAGS is non-zero, we are printing for portable | |
869 | re-input and should single-quote filenames appropriately. */ | |
870 | char * | |
871 | printable_filename (fn, flags) | |
872 | char *fn; | |
873 | int flags; | |
874 | { | |
875 | char *newf; | |
876 | ||
877 | if (ansic_shouldquote (fn)) | |
878 | newf = ansic_quote (fn, 0, NULL); | |
879 | else if (flags && sh_contains_shell_metas (fn)) | |
880 | newf = sh_single_quote (fn); | |
881 | else | |
882 | newf = fn; | |
883 | ||
884 | return newf; | |
885 | } | |
886 | ||
ccc6cda3 JA |
887 | /* Given a string containing units of information separated by colons, |
888 | return the next one pointed to by (P_INDEX), or NULL if there are no more. | |
889 | Advance (P_INDEX) to the character after the colon. */ | |
890 | char * | |
891 | extract_colon_unit (string, p_index) | |
892 | char *string; | |
893 | int *p_index; | |
726f6388 | 894 | { |
ccc6cda3 JA |
895 | int i, start, len; |
896 | char *value; | |
726f6388 | 897 | |
ccc6cda3 JA |
898 | if (string == 0) |
899 | return (string); | |
726f6388 | 900 | |
ccc6cda3 JA |
901 | len = strlen (string); |
902 | if (*p_index >= len) | |
903 | return ((char *)NULL); | |
726f6388 | 904 | |
ccc6cda3 | 905 | i = *p_index; |
726f6388 | 906 | |
ccc6cda3 JA |
907 | /* Each call to this routine leaves the index pointing at a colon if |
908 | there is more to the path. If I is > 0, then increment past the | |
909 | `:'. If I is 0, then the path has a leading colon. Trailing colons | |
910 | are handled OK by the `else' part of the if statement; an empty | |
911 | string is returned in that case. */ | |
912 | if (i && string[i] == ':') | |
913 | i++; | |
914 | ||
915 | for (start = i; string[i] && string[i] != ':'; i++) | |
916 | ; | |
917 | ||
918 | *p_index = i; | |
919 | ||
920 | if (i == start) | |
921 | { | |
922 | if (string[i]) | |
923 | (*p_index)++; | |
924 | /* Return "" in the case of a trailing `:'. */ | |
f73dda09 | 925 | value = (char *)xmalloc (1); |
ccc6cda3 JA |
926 | value[0] = '\0'; |
927 | } | |
928 | else | |
bb70624e | 929 | value = substring (string, start, i); |
ccc6cda3 JA |
930 | |
931 | return (value); | |
726f6388 | 932 | } |
726f6388 JA |
933 | |
934 | /* **************************************************************** */ | |
935 | /* */ | |
936 | /* Tilde Initialization and Expansion */ | |
937 | /* */ | |
938 | /* **************************************************************** */ | |
939 | ||
cce855bc JA |
940 | #if defined (PUSHD_AND_POPD) |
941 | extern char *get_dirstack_from_string __P((char *)); | |
942 | #endif | |
943 | ||
f73dda09 | 944 | static char **bash_tilde_prefixes; |
22e63b05 | 945 | static char **bash_tilde_prefixes2; |
f73dda09 | 946 | static char **bash_tilde_suffixes; |
22e63b05 | 947 | static char **bash_tilde_suffixes2; |
f73dda09 | 948 | |
726f6388 JA |
949 | /* If tilde_expand hasn't been able to expand the text, perhaps it |
950 | is a special shell expansion. This function is installed as the | |
cce855bc JA |
951 | tilde_expansion_preexpansion_hook. It knows how to expand ~- and ~+. |
952 | If PUSHD_AND_POPD is defined, ~[+-]N expands to directories from the | |
953 | directory stack. */ | |
726f6388 | 954 | static char * |
d166f048 | 955 | bash_special_tilde_expansions (text) |
726f6388 JA |
956 | char *text; |
957 | { | |
ccc6cda3 | 958 | char *result; |
726f6388 | 959 | |
ccc6cda3 | 960 | result = (char *)NULL; |
cce855bc JA |
961 | |
962 | if (text[0] == '+' && text[1] == '\0') | |
963 | result = get_string_value ("PWD"); | |
964 | else if (text[0] == '-' && text[1] == '\0') | |
965 | result = get_string_value ("OLDPWD"); | |
966 | #if defined (PUSHD_AND_POPD) | |
f73dda09 | 967 | else if (DIGIT (*text) || ((*text == '+' || *text == '-') && DIGIT (text[1]))) |
cce855bc JA |
968 | result = get_dirstack_from_string (text); |
969 | #endif | |
726f6388 | 970 | |
ccc6cda3 | 971 | return (result ? savestring (result) : (char *)NULL); |
726f6388 JA |
972 | } |
973 | ||
974 | /* Initialize the tilde expander. In Bash, we handle `~-' and `~+', as | |
975 | well as handling special tilde prefixes; `:~" and `=~' are indications | |
976 | that we should do tilde expansion. */ | |
977 | void | |
978 | tilde_initialize () | |
979 | { | |
980 | static int times_called = 0; | |
981 | ||
d166f048 | 982 | /* Tell the tilde expander that we want a crack first. */ |
f73dda09 | 983 | tilde_expansion_preexpansion_hook = bash_special_tilde_expansions; |
726f6388 JA |
984 | |
985 | /* Tell the tilde expander about special strings which start a tilde | |
986 | expansion, and the special strings that end one. Only do this once. | |
987 | tilde_initialize () is called from within bashline_reinitialize (). */ | |
cce855bc | 988 | if (times_called++ == 0) |
726f6388 | 989 | { |
7117c2d2 | 990 | bash_tilde_prefixes = strvec_create (3); |
f73dda09 JA |
991 | bash_tilde_prefixes[0] = "=~"; |
992 | bash_tilde_prefixes[1] = ":~"; | |
993 | bash_tilde_prefixes[2] = (char *)NULL; | |
994 | ||
22e63b05 CR |
995 | bash_tilde_prefixes2 = strvec_create (2); |
996 | bash_tilde_prefixes2[0] = ":~"; | |
997 | bash_tilde_prefixes2[1] = (char *)NULL; | |
998 | ||
f73dda09 JA |
999 | tilde_additional_prefixes = bash_tilde_prefixes; |
1000 | ||
7117c2d2 | 1001 | bash_tilde_suffixes = strvec_create (3); |
f73dda09 JA |
1002 | bash_tilde_suffixes[0] = ":"; |
1003 | bash_tilde_suffixes[1] = "=~"; /* XXX - ?? */ | |
1004 | bash_tilde_suffixes[2] = (char *)NULL; | |
1005 | ||
1006 | tilde_additional_suffixes = bash_tilde_suffixes; | |
22e63b05 CR |
1007 | |
1008 | bash_tilde_suffixes2 = strvec_create (2); | |
1009 | bash_tilde_suffixes2[0] = ":"; | |
1010 | bash_tilde_suffixes2[1] = (char *)NULL; | |
726f6388 | 1011 | } |
726f6388 JA |
1012 | } |
1013 | ||
f73dda09 JA |
1014 | /* POSIX.2, 3.6.1: A tilde-prefix consists of an unquoted tilde character |
1015 | at the beginning of the word, followed by all of the characters preceding | |
1016 | the first unquoted slash in the word, or all the characters in the word | |
1017 | if there is no slash...If none of the characters in the tilde-prefix are | |
1018 | quoted, the characters in the tilde-prefix following the tilde shell be | |
1019 | treated as a possible login name. */ | |
1020 | ||
1021 | #define TILDE_END(c) ((c) == '\0' || (c) == '/' || (c) == ':') | |
1022 | ||
1023 | static int | |
1024 | unquoted_tilde_word (s) | |
1025 | const char *s; | |
1026 | { | |
1027 | const char *r; | |
1028 | ||
1029 | for (r = s; TILDE_END(*r) == 0; r++) | |
1030 | { | |
1031 | switch (*r) | |
1032 | { | |
1033 | case '\\': | |
1034 | case '\'': | |
1035 | case '"': | |
1036 | return 0; | |
1037 | } | |
1038 | } | |
1039 | return 1; | |
1040 | } | |
1041 | ||
22e63b05 CR |
1042 | /* Find the end of the tilde-prefix starting at S, and return the tilde |
1043 | prefix in newly-allocated memory. Return the length of the string in | |
1044 | *LENP. FLAGS tells whether or not we're in an assignment context -- | |
1045 | if so, `:' delimits the end of the tilde prefix as well. */ | |
1046 | char * | |
1047 | bash_tilde_find_word (s, flags, lenp) | |
1048 | const char *s; | |
1049 | int flags, *lenp; | |
1050 | { | |
1051 | const char *r; | |
1052 | char *ret; | |
1053 | int l; | |
1054 | ||
1055 | for (r = s; *r && *r != '/'; r++) | |
1056 | { | |
1057 | /* Short-circuit immediately if we see a quote character. Even though | |
1058 | POSIX says that `the first unquoted slash' (or `:') terminates the | |
1059 | tilde-prefix, in practice, any quoted portion of the tilde prefix | |
1060 | will cause it to not be expanded. */ | |
1061 | if (*r == '\\' || *r == '\'' || *r == '"') | |
1062 | { | |
1063 | ret = savestring (s); | |
1064 | if (lenp) | |
1065 | *lenp = 0; | |
1066 | return ret; | |
1067 | } | |
1068 | else if (flags && *r == ':') | |
1069 | break; | |
1070 | } | |
1071 | l = r - s; | |
1072 | ret = xmalloc (l + 1); | |
1073 | strncpy (ret, s, l); | |
1074 | ret[l] = '\0'; | |
1075 | if (lenp) | |
1076 | *lenp = l; | |
1077 | return ret; | |
1078 | } | |
1079 | ||
7117c2d2 JA |
1080 | /* Tilde-expand S by running it through the tilde expansion library. |
1081 | ASSIGN_P is 1 if this is a variable assignment, so the alternate | |
22e63b05 CR |
1082 | tilde prefixes should be enabled (`=~' and `:~', see above). If |
1083 | ASSIGN_P is 2, we are expanding the rhs of an assignment statement, | |
1084 | so `=~' is not valid. */ | |
ccc6cda3 | 1085 | char * |
7117c2d2 | 1086 | bash_tilde_expand (s, assign_p) |
f73dda09 | 1087 | const char *s; |
7117c2d2 | 1088 | int assign_p; |
726f6388 | 1089 | { |
c92a890b | 1090 | int old_immed, old_term, r; |
ccc6cda3 | 1091 | char *ret; |
726f6388 | 1092 | |
a4eef199 | 1093 | #if 0 |
ccc6cda3 | 1094 | old_immed = interrupt_immediately; |
c92a890b | 1095 | old_term = terminate_immediately; |
36eb585c CR |
1096 | /* We want to be able to interrupt tilde expansion. Ordinarily, we can just |
1097 | jump to top_level, but we don't want to run any trap commands in a signal | |
1098 | handler context. We might be able to get away with just checking for | |
1099 | things like SIGINT and SIGQUIT. */ | |
1100 | if (any_signals_trapped () < 0) | |
1101 | interrupt_immediately = 1; | |
1102 | terminate_immediately = 1; | |
a4eef199 | 1103 | #endif |
22e63b05 CR |
1104 | |
1105 | tilde_additional_prefixes = assign_p == 0 ? (char **)0 | |
1106 | : (assign_p == 2 ? bash_tilde_prefixes2 : bash_tilde_prefixes); | |
1107 | if (assign_p == 2) | |
1108 | tilde_additional_suffixes = bash_tilde_suffixes2; | |
1109 | ||
f73dda09 JA |
1110 | r = (*s == '~') ? unquoted_tilde_word (s) : 1; |
1111 | ret = r ? tilde_expand (s) : savestring (s); | |
36eb585c | 1112 | |
a4eef199 | 1113 | #if 0 |
ccc6cda3 | 1114 | interrupt_immediately = old_immed; |
c92a890b | 1115 | terminate_immediately = old_term; |
a4eef199 | 1116 | #endif |
36eb585c CR |
1117 | |
1118 | QUIT; | |
1119 | ||
ccc6cda3 | 1120 | return (ret); |
726f6388 | 1121 | } |
d166f048 JA |
1122 | |
1123 | /* **************************************************************** */ | |
1124 | /* */ | |
1125 | /* Functions to manipulate and search the group list */ | |
1126 | /* */ | |
1127 | /* **************************************************************** */ | |
1128 | ||
1129 | static int ngroups, maxgroups; | |
1130 | ||
1131 | /* The set of groups that this user is a member of. */ | |
1132 | static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL; | |
1133 | ||
1134 | #if !defined (NOGROUP) | |
1135 | # define NOGROUP (gid_t) -1 | |
1136 | #endif | |
1137 | ||
d166f048 JA |
1138 | static void |
1139 | initialize_group_array () | |
1140 | { | |
1141 | register int i; | |
1142 | ||
1143 | if (maxgroups == 0) | |
1144 | maxgroups = getmaxgroups (); | |
1145 | ||
1146 | ngroups = 0; | |
1147 | group_array = (GETGROUPS_T *)xrealloc (group_array, maxgroups * sizeof (GETGROUPS_T)); | |
1148 | ||
1149 | #if defined (HAVE_GETGROUPS) | |
1150 | ngroups = getgroups (maxgroups, group_array); | |
1151 | #endif | |
1152 | ||
1153 | /* If getgroups returns nothing, or the OS does not support getgroups(), | |
1154 | make sure the groups array includes at least the current gid. */ | |
1155 | if (ngroups == 0) | |
1156 | { | |
1157 | group_array[0] = current_user.gid; | |
1158 | ngroups = 1; | |
1159 | } | |
1160 | ||
1161 | /* If the primary group is not in the groups array, add it as group_array[0] | |
1162 | and shuffle everything else up 1, if there's room. */ | |
1163 | for (i = 0; i < ngroups; i++) | |
1164 | if (current_user.gid == (gid_t)group_array[i]) | |
1165 | break; | |
1166 | if (i == ngroups && ngroups < maxgroups) | |
1167 | { | |
1168 | for (i = ngroups; i > 0; i--) | |
28ef6c31 | 1169 | group_array[i] = group_array[i - 1]; |
d166f048 JA |
1170 | group_array[0] = current_user.gid; |
1171 | ngroups++; | |
1172 | } | |
cce855bc JA |
1173 | |
1174 | /* If the primary group is not group_array[0], swap group_array[0] and | |
1175 | whatever the current group is. The vast majority of systems should | |
1176 | not need this; a notable exception is Linux. */ | |
1177 | if (group_array[0] != current_user.gid) | |
1178 | { | |
1179 | for (i = 0; i < ngroups; i++) | |
28ef6c31 JA |
1180 | if (group_array[i] == current_user.gid) |
1181 | break; | |
cce855bc JA |
1182 | if (i < ngroups) |
1183 | { | |
1184 | group_array[i] = group_array[0]; | |
1185 | group_array[0] = current_user.gid; | |
1186 | } | |
1187 | } | |
d166f048 JA |
1188 | } |
1189 | ||
1190 | /* Return non-zero if GID is one that we have in our groups list. */ | |
1191 | int | |
cce855bc JA |
1192 | #if defined (__STDC__) || defined ( _MINIX) |
1193 | group_member (gid_t gid) | |
1194 | #else | |
d166f048 JA |
1195 | group_member (gid) |
1196 | gid_t gid; | |
cce855bc | 1197 | #endif /* !__STDC__ && !_MINIX */ |
d166f048 JA |
1198 | { |
1199 | #if defined (HAVE_GETGROUPS) | |
1200 | register int i; | |
1201 | #endif | |
1202 | ||
1203 | /* Short-circuit if possible, maybe saving a call to getgroups(). */ | |
1204 | if (gid == current_user.gid || gid == current_user.egid) | |
1205 | return (1); | |
1206 | ||
1207 | #if defined (HAVE_GETGROUPS) | |
1208 | if (ngroups == 0) | |
1209 | initialize_group_array (); | |
1210 | ||
1211 | /* In case of error, the user loses. */ | |
1212 | if (ngroups <= 0) | |
1213 | return (0); | |
1214 | ||
1215 | /* Search through the list looking for GID. */ | |
1216 | for (i = 0; i < ngroups; i++) | |
1217 | if (gid == (gid_t)group_array[i]) | |
1218 | return (1); | |
1219 | #endif | |
1220 | ||
1221 | return (0); | |
1222 | } | |
1223 | ||
1224 | char ** | |
1225 | get_group_list (ngp) | |
1226 | int *ngp; | |
1227 | { | |
1228 | static char **group_vector = (char **)NULL; | |
1229 | register int i; | |
d166f048 JA |
1230 | |
1231 | if (group_vector) | |
1232 | { | |
1233 | if (ngp) | |
1234 | *ngp = ngroups; | |
1235 | return group_vector; | |
1236 | } | |
1237 | ||
1238 | if (ngroups == 0) | |
1239 | initialize_group_array (); | |
1240 | ||
1241 | if (ngroups <= 0) | |
1242 | { | |
1243 | if (ngp) | |
1244 | *ngp = 0; | |
1245 | return (char **)NULL; | |
1246 | } | |
1247 | ||
7117c2d2 | 1248 | group_vector = strvec_create (ngroups); |
d166f048 | 1249 | for (i = 0; i < ngroups; i++) |
7117c2d2 | 1250 | group_vector[i] = itos (group_array[i]); |
b72432fd | 1251 | |
d166f048 JA |
1252 | if (ngp) |
1253 | *ngp = ngroups; | |
1254 | return group_vector; | |
1255 | } | |
b72432fd JA |
1256 | |
1257 | int * | |
1258 | get_group_array (ngp) | |
1259 | int *ngp; | |
1260 | { | |
1261 | int i; | |
1262 | static int *group_iarray = (int *)NULL; | |
1263 | ||
1264 | if (group_iarray) | |
1265 | { | |
1266 | if (ngp) | |
1267 | *ngp = ngroups; | |
1268 | return (group_iarray); | |
1269 | } | |
1270 | ||
1271 | if (ngroups == 0) | |
1272 | initialize_group_array (); | |
1273 | ||
1274 | if (ngroups <= 0) | |
1275 | { | |
1276 | if (ngp) | |
1277 | *ngp = 0; | |
1278 | return (int *)NULL; | |
1279 | } | |
1280 | ||
1281 | group_iarray = (int *)xmalloc (ngroups * sizeof (int)); | |
1282 | for (i = 0; i < ngroups; i++) | |
1283 | group_iarray[i] = (int)group_array[i]; | |
1284 | ||
1285 | if (ngp) | |
1286 | *ngp = ngroups; | |
1287 | return group_iarray; | |
1288 | } | |
1573ba78 CR |
1289 | |
1290 | /* **************************************************************** */ | |
1291 | /* */ | |
1292 | /* Miscellaneous functions */ | |
1293 | /* */ | |
1294 | /* **************************************************************** */ | |
1295 | ||
1296 | /* Return a value for PATH that is guaranteed to find all of the standard | |
1297 | utilities. This uses Posix.2 configuration variables, if present. It | |
1298 | uses a value defined in config.h as a last resort. */ | |
1299 | char * | |
1300 | conf_standard_path () | |
1301 | { | |
1302 | #if defined (_CS_PATH) && defined (HAVE_CONFSTR) | |
1303 | char *p; | |
1304 | size_t len; | |
1305 | ||
1306 | len = (size_t)confstr (_CS_PATH, (char *)NULL, (size_t)0); | |
1307 | if (len > 0) | |
1308 | { | |
1309 | p = (char *)xmalloc (len + 2); | |
1310 | *p = '\0'; | |
1311 | confstr (_CS_PATH, p, len); | |
1312 | return (p); | |
1313 | } | |
1314 | else | |
1315 | return (savestring (STANDARD_UTILS_PATH)); | |
1316 | #else /* !_CS_PATH || !HAVE_CONFSTR */ | |
1317 | # if defined (CS_PATH) | |
1318 | return (savestring (CS_PATH)); | |
1319 | # else | |
1320 | return (savestring (STANDARD_UTILS_PATH)); | |
1321 | # endif /* !CS_PATH */ | |
1322 | #endif /* !_CS_PATH || !HAVE_CONFSTR */ | |
1323 | } |