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Commit | Line | Data |
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726f6388 JA |
1 | /* general.c -- Stuff that is used by all files. */ |
2 | ||
3185942a | 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 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
726f6388 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
726f6388 | 16 | |
3185942a JA |
17 | You should have received a copy of the GNU General Public License |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
726f6388 | 20 | |
ccc6cda3 JA |
21 | #include "config.h" |
22 | ||
726f6388 | 23 | #include "bashtypes.h" |
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 | ||
b80f6443 JA |
39 | #include "bashintl.h" |
40 | ||
726f6388 | 41 | #include "shell.h" |
95732b49 JA |
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. */ |
3185942a | 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; | |
3185942a | 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++; | |
0001803f | 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) | |
3185942a | 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); |
3185942a | 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 | { |
b80f6443 | 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 | { | |
b80f6443 | 236 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
237 | return (0); |
238 | } | |
239 | else | |
240 | return (1); | |
241 | } | |
242 | ||
b80f6443 JA |
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 | |
b80f6443 | 262 | assignment (string, flags) |
7117c2d2 | 263 | const char *string; |
b80f6443 | 264 | int flags; |
7117c2d2 JA |
265 | { |
266 | register unsigned char c; | |
267 | register int newi, indx; | |
268 | ||
269 | c = string[indx = 0]; | |
270 | ||
b80f6443 | 271 | #if defined (ARRAY_VARS) |
eb873671 | 272 | if ((legal_variable_starter (c) == 0) && (flags == 0 || c != '[')) /* ] */ |
b80f6443 | 273 | #else |
7117c2d2 | 274 | if (legal_variable_starter (c) == 0) |
b80f6443 | 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 | { | |
0001803f | 288 | newi = skipsubscript (string, indx, 0); |
7117c2d2 JA |
289 | if (string[newi++] != ']') |
290 | return (0); | |
95732b49 JA |
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 | ||
95732b49 JA |
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 | ||
495aee44 CR |
366 | int |
367 | fd_ispipe (fd) | |
368 | int fd; | |
369 | { | |
370 | errno = 0; | |
371 | if (lseek ((fd), 0L, SEEK_CUR) < 0) | |
372 | return (errno == ESPIPE); | |
373 | return 0; | |
374 | } | |
375 | ||
b72432fd JA |
376 | /* There is a bug in the NeXT 2.1 rlogind that causes opens |
377 | of /dev/tty to fail. */ | |
378 | ||
379 | #if defined (__BEOS__) | |
380 | /* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it | |
381 | into a no-op. This should probably go away in the future. */ | |
382 | # undef O_NONBLOCK | |
383 | # define O_NONBLOCK 0 | |
384 | #endif /* __BEOS__ */ | |
385 | ||
726f6388 | 386 | void |
ccc6cda3 | 387 | check_dev_tty () |
726f6388 | 388 | { |
ccc6cda3 JA |
389 | int tty_fd; |
390 | char *tty; | |
726f6388 | 391 | |
d166f048 | 392 | tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK); |
726f6388 | 393 | |
ccc6cda3 | 394 | if (tty_fd < 0) |
726f6388 | 395 | { |
ccc6cda3 JA |
396 | tty = (char *)ttyname (fileno (stdin)); |
397 | if (tty == 0) | |
398 | return; | |
d166f048 | 399 | tty_fd = open (tty, O_RDWR|O_NONBLOCK); |
726f6388 | 400 | } |
ccc6cda3 | 401 | close (tty_fd); |
726f6388 JA |
402 | } |
403 | ||
ccc6cda3 JA |
404 | /* Return 1 if PATH1 and PATH2 are the same file. This is kind of |
405 | expensive. If non-NULL STP1 and STP2 point to stat structures | |
406 | corresponding to PATH1 and PATH2, respectively. */ | |
726f6388 | 407 | int |
ccc6cda3 JA |
408 | same_file (path1, path2, stp1, stp2) |
409 | char *path1, *path2; | |
410 | struct stat *stp1, *stp2; | |
726f6388 | 411 | { |
ccc6cda3 | 412 | struct stat st1, st2; |
726f6388 | 413 | |
ccc6cda3 | 414 | if (stp1 == NULL) |
726f6388 | 415 | { |
ccc6cda3 JA |
416 | if (stat (path1, &st1) != 0) |
417 | return (0); | |
418 | stp1 = &st1; | |
726f6388 | 419 | } |
726f6388 | 420 | |
ccc6cda3 JA |
421 | if (stp2 == NULL) |
422 | { | |
423 | if (stat (path2, &st2) != 0) | |
424 | return (0); | |
425 | stp2 = &st2; | |
426 | } | |
726f6388 | 427 | |
ccc6cda3 | 428 | return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino)); |
726f6388 JA |
429 | } |
430 | ||
ccc6cda3 JA |
431 | /* Move FD to a number close to the maximum number of file descriptors |
432 | allowed in the shell process, to avoid the user stepping on it with | |
433 | redirection and causing us extra work. If CHECK_NEW is non-zero, | |
434 | we check whether or not the file descriptors are in use before | |
d166f048 JA |
435 | duplicating FD onto them. MAXFD says where to start checking the |
436 | file descriptors. If it's less than 20, we get the maximum value | |
437 | available from getdtablesize(2). */ | |
726f6388 | 438 | int |
d166f048 JA |
439 | move_to_high_fd (fd, check_new, maxfd) |
440 | int fd, check_new, maxfd; | |
726f6388 | 441 | { |
ccc6cda3 | 442 | int script_fd, nfds, ignore; |
726f6388 | 443 | |
d166f048 JA |
444 | if (maxfd < 20) |
445 | { | |
446 | nfds = getdtablesize (); | |
447 | if (nfds <= 0) | |
448 | nfds = 20; | |
7117c2d2 JA |
449 | if (nfds > HIGH_FD_MAX) |
450 | nfds = HIGH_FD_MAX; /* reasonable maximum */ | |
d166f048 JA |
451 | } |
452 | else | |
453 | nfds = maxfd; | |
726f6388 | 454 | |
ccc6cda3 JA |
455 | for (nfds--; check_new && nfds > 3; nfds--) |
456 | if (fcntl (nfds, F_GETFD, &ignore) == -1) | |
457 | break; | |
726f6388 | 458 | |
7117c2d2 | 459 | if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1) |
ccc6cda3 JA |
460 | { |
461 | if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */ | |
462 | close (fd); | |
463 | return (script_fd); | |
464 | } | |
726f6388 | 465 | |
7117c2d2 JA |
466 | /* OK, we didn't find one less than our artificial maximum; return the |
467 | original file descriptor. */ | |
ccc6cda3 JA |
468 | return (fd); |
469 | } | |
470 | ||
471 | /* Return non-zero if the characters from SAMPLE are not all valid | |
472 | characters to be found in the first line of a shell script. We | |
473 | check up to the first newline, or SAMPLE_LEN, whichever comes first. | |
474 | All of the characters must be printable or whitespace. */ | |
726f6388 | 475 | |
726f6388 | 476 | int |
ccc6cda3 | 477 | check_binary_file (sample, sample_len) |
f73dda09 | 478 | char *sample; |
ccc6cda3 | 479 | int sample_len; |
726f6388 | 480 | { |
ccc6cda3 | 481 | register int i; |
f73dda09 | 482 | unsigned char c; |
726f6388 | 483 | |
ccc6cda3 JA |
484 | for (i = 0; i < sample_len; i++) |
485 | { | |
f73dda09 JA |
486 | c = sample[i]; |
487 | if (c == '\n') | |
ccc6cda3 | 488 | return (0); |
0628567a | 489 | if (c == '\0') |
ccc6cda3 JA |
490 | return (1); |
491 | } | |
726f6388 | 492 | |
ccc6cda3 | 493 | return (0); |
726f6388 JA |
494 | } |
495 | ||
3185942a JA |
496 | /* **************************************************************** */ |
497 | /* */ | |
498 | /* Functions to manipulate pipes */ | |
499 | /* */ | |
500 | /* **************************************************************** */ | |
501 | ||
502 | int | |
503 | sh_openpipe (pv) | |
504 | int *pv; | |
505 | { | |
506 | int r; | |
507 | ||
508 | if ((r = pipe (pv)) < 0) | |
509 | return r; | |
510 | ||
511 | pv[0] = move_to_high_fd (pv[0], 1, 64); | |
512 | pv[1] = move_to_high_fd (pv[1], 1, 64); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | int | |
518 | sh_closepipe (pv) | |
519 | int *pv; | |
520 | { | |
521 | if (pv[0] >= 0) | |
522 | close (pv[0]); | |
523 | ||
524 | if (pv[1] >= 0) | |
525 | close (pv[1]); | |
526 | ||
527 | pv[0] = pv[1] = -1; | |
528 | return 0; | |
529 | } | |
530 | ||
b80f6443 JA |
531 | /* **************************************************************** */ |
532 | /* */ | |
533 | /* Functions to inspect pathnames */ | |
534 | /* */ | |
535 | /* **************************************************************** */ | |
536 | ||
3185942a JA |
537 | int |
538 | file_exists (fn) | |
539 | char *fn; | |
540 | { | |
541 | struct stat sb; | |
542 | ||
543 | return (stat (fn, &sb) == 0); | |
544 | } | |
545 | ||
b80f6443 JA |
546 | int |
547 | file_isdir (fn) | |
548 | char *fn; | |
549 | { | |
550 | struct stat sb; | |
551 | ||
552 | return ((stat (fn, &sb) == 0) && S_ISDIR (sb.st_mode)); | |
553 | } | |
554 | ||
555 | int | |
556 | file_iswdir (fn) | |
557 | char *fn; | |
558 | { | |
0628567a | 559 | return (file_isdir (fn) && sh_eaccess (fn, W_OK) == 0); |
b80f6443 JA |
560 | } |
561 | ||
495aee44 CR |
562 | /* Return 1 if STRING is "." or "..", optionally followed by a directory |
563 | separator */ | |
564 | int | |
565 | dot_or_dotdot (string) | |
566 | const char *string; | |
567 | { | |
568 | if (string == 0 || *string == '\0' || *string != '.') | |
569 | return (0); | |
570 | ||
571 | /* string[0] == '.' */ | |
572 | if (PATHSEP(string[1]) || (string[1] == '.' && PATHSEP(string[2]))) | |
573 | return (1); | |
574 | ||
575 | return (0); | |
576 | } | |
577 | ||
95732b49 JA |
578 | /* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd' |
579 | to decide whether or not to look up a directory name in $CDPATH. */ | |
580 | int | |
581 | absolute_pathname (string) | |
582 | const char *string; | |
583 | { | |
584 | if (string == 0 || *string == '\0') | |
585 | return (0); | |
586 | ||
587 | if (ABSPATH(string)) | |
588 | return (1); | |
589 | ||
590 | if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */ | |
591 | return (1); | |
592 | ||
593 | if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */ | |
594 | return (1); | |
595 | ||
596 | return (0); | |
597 | } | |
598 | ||
599 | /* Return 1 if STRING is an absolute program name; it is absolute if it | |
600 | contains any slashes. This is used to decide whether or not to look | |
601 | up through $PATH. */ | |
602 | int | |
603 | absolute_program (string) | |
604 | const char *string; | |
605 | { | |
0001803f | 606 | return ((char *)mbschr (string, '/') != (char *)NULL); |
95732b49 | 607 | } |
b80f6443 | 608 | |
ccc6cda3 JA |
609 | /* **************************************************************** */ |
610 | /* */ | |
611 | /* Functions to manipulate pathnames */ | |
612 | /* */ | |
613 | /* **************************************************************** */ | |
726f6388 | 614 | |
726f6388 JA |
615 | /* Turn STRING (a pathname) into an absolute pathname, assuming that |
616 | DOT_PATH contains the symbolic location of `.'. This always | |
617 | returns a new string, even if STRING was an absolute pathname to | |
618 | begin with. */ | |
619 | char * | |
620 | make_absolute (string, dot_path) | |
621 | char *string, *dot_path; | |
622 | { | |
623 | char *result; | |
ccc6cda3 | 624 | |
28ef6c31 | 625 | if (dot_path == 0 || ABSPATH(string)) |
b80f6443 JA |
626 | #ifdef __CYGWIN__ |
627 | { | |
628 | char pathbuf[PATH_MAX + 1]; | |
629 | ||
630 | cygwin_conv_to_full_posix_path (string, pathbuf); | |
631 | result = savestring (pathbuf); | |
632 | } | |
633 | #else | |
726f6388 | 634 | result = savestring (string); |
b80f6443 | 635 | #endif |
726f6388 | 636 | else |
bb70624e | 637 | result = sh_makepath (dot_path, string, 0); |
726f6388 JA |
638 | |
639 | return (result); | |
640 | } | |
641 | ||
726f6388 | 642 | /* Return the `basename' of the pathname in STRING (the stuff after the |
95732b49 | 643 | last '/'). If STRING is `/', just return it. */ |
726f6388 JA |
644 | char * |
645 | base_pathname (string) | |
646 | char *string; | |
647 | { | |
648 | char *p; | |
649 | ||
95732b49 | 650 | #if 0 |
28ef6c31 | 651 | if (absolute_pathname (string) == 0) |
726f6388 | 652 | return (string); |
95732b49 JA |
653 | #endif |
654 | ||
655 | if (string[0] == '/' && string[1] == 0) | |
656 | return (string); | |
726f6388 JA |
657 | |
658 | p = (char *)strrchr (string, '/'); | |
ccc6cda3 | 659 | return (p ? ++p : string); |
726f6388 JA |
660 | } |
661 | ||
662 | /* Return the full pathname of FILE. Easy. Filenames that begin | |
663 | with a '/' are returned as themselves. Other filenames have | |
664 | the current working directory prepended. A new string is | |
665 | returned in either case. */ | |
666 | char * | |
667 | full_pathname (file) | |
668 | char *file; | |
669 | { | |
bb70624e | 670 | char *ret; |
726f6388 | 671 | |
7117c2d2 | 672 | file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file); |
726f6388 | 673 | |
28ef6c31 | 674 | if (ABSPATH(file)) |
726f6388 JA |
675 | return (file); |
676 | ||
bb70624e JA |
677 | ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT)); |
678 | free (file); | |
726f6388 | 679 | |
bb70624e | 680 | return (ret); |
726f6388 | 681 | } |
726f6388 JA |
682 | |
683 | /* A slightly related function. Get the prettiest name of this | |
684 | directory possible. */ | |
ccc6cda3 | 685 | static char tdir[PATH_MAX]; |
726f6388 JA |
686 | |
687 | /* Return a pretty pathname. If the first part of the pathname is | |
688 | the same as $HOME, then replace that with `~'. */ | |
689 | char * | |
690 | polite_directory_format (name) | |
691 | char *name; | |
692 | { | |
ccc6cda3 JA |
693 | char *home; |
694 | int l; | |
726f6388 | 695 | |
ccc6cda3 JA |
696 | home = get_string_value ("HOME"); |
697 | l = home ? strlen (home) : 0; | |
726f6388 JA |
698 | if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/')) |
699 | { | |
e8ce775d | 700 | strncpy (tdir + 1, name + l, sizeof(tdir) - 2); |
726f6388 | 701 | tdir[0] = '~'; |
e8ce775d | 702 | tdir[sizeof(tdir) - 1] = '\0'; |
726f6388 JA |
703 | return (tdir); |
704 | } | |
705 | else | |
706 | return (name); | |
707 | } | |
708 | ||
3185942a JA |
709 | /* Trim NAME. If NAME begins with `~/', skip over tilde prefix. Trim to |
710 | keep any tilde prefix and PROMPT_DIRTRIM trailing directory components | |
711 | and replace the intervening characters with `...' */ | |
712 | char * | |
713 | trim_pathname (name, maxlen) | |
714 | char *name; | |
715 | int maxlen; | |
716 | { | |
717 | int nlen, ndirs; | |
718 | intmax_t nskip; | |
719 | char *nbeg, *nend, *ntail, *v; | |
720 | ||
721 | if (name == 0 || (nlen = strlen (name)) == 0) | |
722 | return name; | |
723 | nend = name + nlen; | |
724 | ||
725 | v = get_string_value ("PROMPT_DIRTRIM"); | |
726 | if (v == 0 || *v == 0) | |
727 | return name; | |
728 | if (legal_number (v, &nskip) == 0 || nskip <= 0) | |
729 | return name; | |
730 | ||
731 | /* Skip over tilde prefix */ | |
732 | nbeg = name; | |
733 | if (name[0] == '~') | |
734 | for (nbeg = name; *nbeg; nbeg++) | |
735 | if (*nbeg == '/') | |
736 | { | |
737 | nbeg++; | |
738 | break; | |
739 | } | |
740 | if (*nbeg == 0) | |
741 | return name; | |
742 | ||
743 | for (ndirs = 0, ntail = nbeg; *ntail; ntail++) | |
744 | if (*ntail == '/') | |
745 | ndirs++; | |
0001803f | 746 | if (ndirs < nskip) |
3185942a JA |
747 | return name; |
748 | ||
749 | for (ntail = (*nend == '/') ? nend : nend - 1; ntail > nbeg; ntail--) | |
750 | { | |
751 | if (*ntail == '/') | |
752 | nskip--; | |
753 | if (nskip == 0) | |
754 | break; | |
755 | } | |
756 | if (ntail == nbeg) | |
757 | return name; | |
758 | ||
759 | /* Now we want to return name[0..nbeg]+"..."+ntail, modifying name in place */ | |
760 | nlen = ntail - nbeg; | |
761 | if (nlen <= 3) | |
762 | return name; | |
763 | ||
764 | *nbeg++ = '.'; | |
765 | *nbeg++ = '.'; | |
766 | *nbeg++ = '.'; | |
767 | ||
768 | nlen = nend - ntail; | |
769 | memcpy (nbeg, ntail, nlen); | |
770 | nbeg[nlen] = '\0'; | |
771 | ||
772 | return name; | |
773 | } | |
774 | ||
ccc6cda3 JA |
775 | /* Given a string containing units of information separated by colons, |
776 | return the next one pointed to by (P_INDEX), or NULL if there are no more. | |
777 | Advance (P_INDEX) to the character after the colon. */ | |
778 | char * | |
779 | extract_colon_unit (string, p_index) | |
780 | char *string; | |
781 | int *p_index; | |
726f6388 | 782 | { |
ccc6cda3 JA |
783 | int i, start, len; |
784 | char *value; | |
726f6388 | 785 | |
ccc6cda3 JA |
786 | if (string == 0) |
787 | return (string); | |
726f6388 | 788 | |
ccc6cda3 JA |
789 | len = strlen (string); |
790 | if (*p_index >= len) | |
791 | return ((char *)NULL); | |
726f6388 | 792 | |
ccc6cda3 | 793 | i = *p_index; |
726f6388 | 794 | |
ccc6cda3 JA |
795 | /* Each call to this routine leaves the index pointing at a colon if |
796 | there is more to the path. If I is > 0, then increment past the | |
797 | `:'. If I is 0, then the path has a leading colon. Trailing colons | |
798 | are handled OK by the `else' part of the if statement; an empty | |
799 | string is returned in that case. */ | |
800 | if (i && string[i] == ':') | |
801 | i++; | |
802 | ||
803 | for (start = i; string[i] && string[i] != ':'; i++) | |
804 | ; | |
805 | ||
806 | *p_index = i; | |
807 | ||
808 | if (i == start) | |
809 | { | |
810 | if (string[i]) | |
811 | (*p_index)++; | |
812 | /* Return "" in the case of a trailing `:'. */ | |
f73dda09 | 813 | value = (char *)xmalloc (1); |
ccc6cda3 JA |
814 | value[0] = '\0'; |
815 | } | |
816 | else | |
bb70624e | 817 | value = substring (string, start, i); |
ccc6cda3 JA |
818 | |
819 | return (value); | |
726f6388 | 820 | } |
726f6388 JA |
821 | |
822 | /* **************************************************************** */ | |
823 | /* */ | |
824 | /* Tilde Initialization and Expansion */ | |
825 | /* */ | |
826 | /* **************************************************************** */ | |
827 | ||
cce855bc JA |
828 | #if defined (PUSHD_AND_POPD) |
829 | extern char *get_dirstack_from_string __P((char *)); | |
830 | #endif | |
831 | ||
f73dda09 | 832 | static char **bash_tilde_prefixes; |
95732b49 | 833 | static char **bash_tilde_prefixes2; |
f73dda09 | 834 | static char **bash_tilde_suffixes; |
95732b49 | 835 | static char **bash_tilde_suffixes2; |
f73dda09 | 836 | |
726f6388 JA |
837 | /* If tilde_expand hasn't been able to expand the text, perhaps it |
838 | is a special shell expansion. This function is installed as the | |
cce855bc JA |
839 | tilde_expansion_preexpansion_hook. It knows how to expand ~- and ~+. |
840 | If PUSHD_AND_POPD is defined, ~[+-]N expands to directories from the | |
841 | directory stack. */ | |
726f6388 | 842 | static char * |
d166f048 | 843 | bash_special_tilde_expansions (text) |
726f6388 JA |
844 | char *text; |
845 | { | |
ccc6cda3 | 846 | char *result; |
726f6388 | 847 | |
ccc6cda3 | 848 | result = (char *)NULL; |
cce855bc JA |
849 | |
850 | if (text[0] == '+' && text[1] == '\0') | |
851 | result = get_string_value ("PWD"); | |
852 | else if (text[0] == '-' && text[1] == '\0') | |
853 | result = get_string_value ("OLDPWD"); | |
854 | #if defined (PUSHD_AND_POPD) | |
f73dda09 | 855 | else if (DIGIT (*text) || ((*text == '+' || *text == '-') && DIGIT (text[1]))) |
cce855bc JA |
856 | result = get_dirstack_from_string (text); |
857 | #endif | |
726f6388 | 858 | |
ccc6cda3 | 859 | return (result ? savestring (result) : (char *)NULL); |
726f6388 JA |
860 | } |
861 | ||
862 | /* Initialize the tilde expander. In Bash, we handle `~-' and `~+', as | |
863 | well as handling special tilde prefixes; `:~" and `=~' are indications | |
864 | that we should do tilde expansion. */ | |
865 | void | |
866 | tilde_initialize () | |
867 | { | |
868 | static int times_called = 0; | |
869 | ||
d166f048 | 870 | /* Tell the tilde expander that we want a crack first. */ |
f73dda09 | 871 | tilde_expansion_preexpansion_hook = bash_special_tilde_expansions; |
726f6388 JA |
872 | |
873 | /* Tell the tilde expander about special strings which start a tilde | |
874 | expansion, and the special strings that end one. Only do this once. | |
875 | tilde_initialize () is called from within bashline_reinitialize (). */ | |
cce855bc | 876 | if (times_called++ == 0) |
726f6388 | 877 | { |
7117c2d2 | 878 | bash_tilde_prefixes = strvec_create (3); |
f73dda09 JA |
879 | bash_tilde_prefixes[0] = "=~"; |
880 | bash_tilde_prefixes[1] = ":~"; | |
881 | bash_tilde_prefixes[2] = (char *)NULL; | |
882 | ||
95732b49 JA |
883 | bash_tilde_prefixes2 = strvec_create (2); |
884 | bash_tilde_prefixes2[0] = ":~"; | |
885 | bash_tilde_prefixes2[1] = (char *)NULL; | |
886 | ||
f73dda09 JA |
887 | tilde_additional_prefixes = bash_tilde_prefixes; |
888 | ||
7117c2d2 | 889 | bash_tilde_suffixes = strvec_create (3); |
f73dda09 JA |
890 | bash_tilde_suffixes[0] = ":"; |
891 | bash_tilde_suffixes[1] = "=~"; /* XXX - ?? */ | |
892 | bash_tilde_suffixes[2] = (char *)NULL; | |
893 | ||
894 | tilde_additional_suffixes = bash_tilde_suffixes; | |
95732b49 JA |
895 | |
896 | bash_tilde_suffixes2 = strvec_create (2); | |
897 | bash_tilde_suffixes2[0] = ":"; | |
898 | bash_tilde_suffixes2[1] = (char *)NULL; | |
726f6388 | 899 | } |
726f6388 JA |
900 | } |
901 | ||
f73dda09 JA |
902 | /* POSIX.2, 3.6.1: A tilde-prefix consists of an unquoted tilde character |
903 | at the beginning of the word, followed by all of the characters preceding | |
904 | the first unquoted slash in the word, or all the characters in the word | |
905 | if there is no slash...If none of the characters in the tilde-prefix are | |
906 | quoted, the characters in the tilde-prefix following the tilde shell be | |
907 | treated as a possible login name. */ | |
908 | ||
909 | #define TILDE_END(c) ((c) == '\0' || (c) == '/' || (c) == ':') | |
910 | ||
911 | static int | |
912 | unquoted_tilde_word (s) | |
913 | const char *s; | |
914 | { | |
915 | const char *r; | |
916 | ||
917 | for (r = s; TILDE_END(*r) == 0; r++) | |
918 | { | |
919 | switch (*r) | |
920 | { | |
921 | case '\\': | |
922 | case '\'': | |
923 | case '"': | |
924 | return 0; | |
925 | } | |
926 | } | |
927 | return 1; | |
928 | } | |
929 | ||
95732b49 JA |
930 | /* Find the end of the tilde-prefix starting at S, and return the tilde |
931 | prefix in newly-allocated memory. Return the length of the string in | |
932 | *LENP. FLAGS tells whether or not we're in an assignment context -- | |
933 | if so, `:' delimits the end of the tilde prefix as well. */ | |
934 | char * | |
935 | bash_tilde_find_word (s, flags, lenp) | |
936 | const char *s; | |
937 | int flags, *lenp; | |
938 | { | |
939 | const char *r; | |
940 | char *ret; | |
941 | int l; | |
942 | ||
943 | for (r = s; *r && *r != '/'; r++) | |
944 | { | |
945 | /* Short-circuit immediately if we see a quote character. Even though | |
946 | POSIX says that `the first unquoted slash' (or `:') terminates the | |
947 | tilde-prefix, in practice, any quoted portion of the tilde prefix | |
948 | will cause it to not be expanded. */ | |
949 | if (*r == '\\' || *r == '\'' || *r == '"') | |
950 | { | |
951 | ret = savestring (s); | |
952 | if (lenp) | |
953 | *lenp = 0; | |
954 | return ret; | |
955 | } | |
956 | else if (flags && *r == ':') | |
957 | break; | |
958 | } | |
959 | l = r - s; | |
960 | ret = xmalloc (l + 1); | |
961 | strncpy (ret, s, l); | |
962 | ret[l] = '\0'; | |
963 | if (lenp) | |
964 | *lenp = l; | |
965 | return ret; | |
966 | } | |
967 | ||
7117c2d2 JA |
968 | /* Tilde-expand S by running it through the tilde expansion library. |
969 | ASSIGN_P is 1 if this is a variable assignment, so the alternate | |
95732b49 JA |
970 | tilde prefixes should be enabled (`=~' and `:~', see above). If |
971 | ASSIGN_P is 2, we are expanding the rhs of an assignment statement, | |
972 | so `=~' is not valid. */ | |
ccc6cda3 | 973 | char * |
7117c2d2 | 974 | bash_tilde_expand (s, assign_p) |
f73dda09 | 975 | const char *s; |
7117c2d2 | 976 | int assign_p; |
726f6388 | 977 | { |
3185942a | 978 | int old_immed, old_term, r; |
ccc6cda3 | 979 | char *ret; |
726f6388 | 980 | |
ccc6cda3 | 981 | old_immed = interrupt_immediately; |
3185942a JA |
982 | old_term = terminate_immediately; |
983 | interrupt_immediately = terminate_immediately = 1; | |
95732b49 JA |
984 | |
985 | tilde_additional_prefixes = assign_p == 0 ? (char **)0 | |
986 | : (assign_p == 2 ? bash_tilde_prefixes2 : bash_tilde_prefixes); | |
987 | if (assign_p == 2) | |
988 | tilde_additional_suffixes = bash_tilde_suffixes2; | |
989 | ||
f73dda09 JA |
990 | r = (*s == '~') ? unquoted_tilde_word (s) : 1; |
991 | ret = r ? tilde_expand (s) : savestring (s); | |
ccc6cda3 | 992 | interrupt_immediately = old_immed; |
3185942a | 993 | terminate_immediately = old_term; |
ccc6cda3 | 994 | return (ret); |
726f6388 | 995 | } |
d166f048 JA |
996 | |
997 | /* **************************************************************** */ | |
998 | /* */ | |
999 | /* Functions to manipulate and search the group list */ | |
1000 | /* */ | |
1001 | /* **************************************************************** */ | |
1002 | ||
1003 | static int ngroups, maxgroups; | |
1004 | ||
1005 | /* The set of groups that this user is a member of. */ | |
1006 | static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL; | |
1007 | ||
1008 | #if !defined (NOGROUP) | |
1009 | # define NOGROUP (gid_t) -1 | |
1010 | #endif | |
1011 | ||
d166f048 JA |
1012 | static void |
1013 | initialize_group_array () | |
1014 | { | |
1015 | register int i; | |
1016 | ||
1017 | if (maxgroups == 0) | |
1018 | maxgroups = getmaxgroups (); | |
1019 | ||
1020 | ngroups = 0; | |
1021 | group_array = (GETGROUPS_T *)xrealloc (group_array, maxgroups * sizeof (GETGROUPS_T)); | |
1022 | ||
1023 | #if defined (HAVE_GETGROUPS) | |
1024 | ngroups = getgroups (maxgroups, group_array); | |
1025 | #endif | |
1026 | ||
1027 | /* If getgroups returns nothing, or the OS does not support getgroups(), | |
1028 | make sure the groups array includes at least the current gid. */ | |
1029 | if (ngroups == 0) | |
1030 | { | |
1031 | group_array[0] = current_user.gid; | |
1032 | ngroups = 1; | |
1033 | } | |
1034 | ||
1035 | /* If the primary group is not in the groups array, add it as group_array[0] | |
1036 | and shuffle everything else up 1, if there's room. */ | |
1037 | for (i = 0; i < ngroups; i++) | |
1038 | if (current_user.gid == (gid_t)group_array[i]) | |
1039 | break; | |
1040 | if (i == ngroups && ngroups < maxgroups) | |
1041 | { | |
1042 | for (i = ngroups; i > 0; i--) | |
28ef6c31 | 1043 | group_array[i] = group_array[i - 1]; |
d166f048 JA |
1044 | group_array[0] = current_user.gid; |
1045 | ngroups++; | |
1046 | } | |
cce855bc JA |
1047 | |
1048 | /* If the primary group is not group_array[0], swap group_array[0] and | |
1049 | whatever the current group is. The vast majority of systems should | |
1050 | not need this; a notable exception is Linux. */ | |
1051 | if (group_array[0] != current_user.gid) | |
1052 | { | |
1053 | for (i = 0; i < ngroups; i++) | |
28ef6c31 JA |
1054 | if (group_array[i] == current_user.gid) |
1055 | break; | |
cce855bc JA |
1056 | if (i < ngroups) |
1057 | { | |
1058 | group_array[i] = group_array[0]; | |
1059 | group_array[0] = current_user.gid; | |
1060 | } | |
1061 | } | |
d166f048 JA |
1062 | } |
1063 | ||
1064 | /* Return non-zero if GID is one that we have in our groups list. */ | |
1065 | int | |
cce855bc JA |
1066 | #if defined (__STDC__) || defined ( _MINIX) |
1067 | group_member (gid_t gid) | |
1068 | #else | |
d166f048 JA |
1069 | group_member (gid) |
1070 | gid_t gid; | |
cce855bc | 1071 | #endif /* !__STDC__ && !_MINIX */ |
d166f048 JA |
1072 | { |
1073 | #if defined (HAVE_GETGROUPS) | |
1074 | register int i; | |
1075 | #endif | |
1076 | ||
1077 | /* Short-circuit if possible, maybe saving a call to getgroups(). */ | |
1078 | if (gid == current_user.gid || gid == current_user.egid) | |
1079 | return (1); | |
1080 | ||
1081 | #if defined (HAVE_GETGROUPS) | |
1082 | if (ngroups == 0) | |
1083 | initialize_group_array (); | |
1084 | ||
1085 | /* In case of error, the user loses. */ | |
1086 | if (ngroups <= 0) | |
1087 | return (0); | |
1088 | ||
1089 | /* Search through the list looking for GID. */ | |
1090 | for (i = 0; i < ngroups; i++) | |
1091 | if (gid == (gid_t)group_array[i]) | |
1092 | return (1); | |
1093 | #endif | |
1094 | ||
1095 | return (0); | |
1096 | } | |
1097 | ||
1098 | char ** | |
1099 | get_group_list (ngp) | |
1100 | int *ngp; | |
1101 | { | |
1102 | static char **group_vector = (char **)NULL; | |
1103 | register int i; | |
d166f048 JA |
1104 | |
1105 | if (group_vector) | |
1106 | { | |
1107 | if (ngp) | |
1108 | *ngp = ngroups; | |
1109 | return group_vector; | |
1110 | } | |
1111 | ||
1112 | if (ngroups == 0) | |
1113 | initialize_group_array (); | |
1114 | ||
1115 | if (ngroups <= 0) | |
1116 | { | |
1117 | if (ngp) | |
1118 | *ngp = 0; | |
1119 | return (char **)NULL; | |
1120 | } | |
1121 | ||
7117c2d2 | 1122 | group_vector = strvec_create (ngroups); |
d166f048 | 1123 | for (i = 0; i < ngroups; i++) |
7117c2d2 | 1124 | group_vector[i] = itos (group_array[i]); |
b72432fd | 1125 | |
d166f048 JA |
1126 | if (ngp) |
1127 | *ngp = ngroups; | |
1128 | return group_vector; | |
1129 | } | |
b72432fd JA |
1130 | |
1131 | int * | |
1132 | get_group_array (ngp) | |
1133 | int *ngp; | |
1134 | { | |
1135 | int i; | |
1136 | static int *group_iarray = (int *)NULL; | |
1137 | ||
1138 | if (group_iarray) | |
1139 | { | |
1140 | if (ngp) | |
1141 | *ngp = ngroups; | |
1142 | return (group_iarray); | |
1143 | } | |
1144 | ||
1145 | if (ngroups == 0) | |
1146 | initialize_group_array (); | |
1147 | ||
1148 | if (ngroups <= 0) | |
1149 | { | |
1150 | if (ngp) | |
1151 | *ngp = 0; | |
1152 | return (int *)NULL; | |
1153 | } | |
1154 | ||
1155 | group_iarray = (int *)xmalloc (ngroups * sizeof (int)); | |
1156 | for (i = 0; i < ngroups; i++) | |
1157 | group_iarray[i] = (int)group_array[i]; | |
1158 | ||
1159 | if (ngp) | |
1160 | *ngp = ngroups; | |
1161 | return group_iarray; | |
1162 | } |