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Commit | Line | Data |
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726f6388 JA |
1 | /* general.c -- Stuff that is used by all files. */ |
2 | ||
7117c2d2 | 3 | /* Copyright (C) 1987-2002 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License along | |
18 | with Bash; see the file COPYING. If not, write to the Free Software | |
bb70624e | 19 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
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 | ||
726f6388 JA |
39 | #include "shell.h" |
40 | #include <tilde/tilde.h> | |
41 | ||
726f6388 JA |
42 | #if !defined (errno) |
43 | extern int errno; | |
44 | #endif /* !errno */ | |
45 | ||
f73dda09 | 46 | extern int expand_aliases; |
ccc6cda3 JA |
47 | extern int interrupt_immediately; |
48 | extern int interactive_comments; | |
28ef6c31 JA |
49 | extern int check_hashed_filenames; |
50 | extern int source_uses_path; | |
51 | extern int source_searches_cwd; | |
cce855bc | 52 | |
7117c2d2 JA |
53 | static char *bash_special_tilde_expansions __P((char *)); |
54 | static int unquoted_tilde_word __P((const char *)); | |
55 | static void initialize_group_array __P((void)); | |
56 | ||
cce855bc JA |
57 | /* A standard error message to use when getcwd() returns NULL. */ |
58 | char *bash_getcwd_errstr = "getcwd: cannot access parent directories"; | |
726f6388 | 59 | |
ccc6cda3 | 60 | /* Do whatever is necessary to initialize `Posix mode'. */ |
726f6388 | 61 | void |
ccc6cda3 JA |
62 | posix_initialize (on) |
63 | int on; | |
726f6388 | 64 | { |
28ef6c31 JA |
65 | /* Things that should be turned on when posix mode is enabled. */ |
66 | if (on != 0) | |
67 | { | |
68 | interactive_comments = source_uses_path = expand_aliases = 1; | |
69 | } | |
70 | ||
71 | /* Things that should be turned on when posix mode is disabled. */ | |
72 | if (on == 0) | |
73 | { | |
74 | source_searches_cwd = 1; | |
75 | expand_aliases = interactive_shell; | |
76 | } | |
726f6388 JA |
77 | } |
78 | ||
ccc6cda3 JA |
79 | /* **************************************************************** */ |
80 | /* */ | |
81 | /* Functions to convert to and from and display non-standard types */ | |
82 | /* */ | |
83 | /* **************************************************************** */ | |
84 | ||
726f6388 JA |
85 | #if defined (RLIMTYPE) |
86 | RLIMTYPE | |
87 | string_to_rlimtype (s) | |
88 | char *s; | |
89 | { | |
cce855bc JA |
90 | RLIMTYPE ret; |
91 | int neg; | |
726f6388 | 92 | |
cce855bc JA |
93 | ret = 0; |
94 | neg = 0; | |
726f6388 JA |
95 | while (s && *s && whitespace (*s)) |
96 | s++; | |
97 | if (*s == '-' || *s == '+') | |
98 | { | |
99 | neg = *s == '-'; | |
100 | s++; | |
101 | } | |
f73dda09 JA |
102 | for ( ; s && *s && DIGIT (*s); s++) |
103 | ret = (ret * 10) + TODIGIT (*s); | |
726f6388 JA |
104 | return (neg ? -ret : ret); |
105 | } | |
106 | ||
107 | void | |
108 | print_rlimtype (n, addnl) | |
109 | RLIMTYPE n; | |
110 | int addnl; | |
111 | { | |
f73dda09 | 112 | char s[INT_STRLEN_BOUND (RLIMTYPE) + 1], *p; |
726f6388 | 113 | |
f73dda09 JA |
114 | p = s + sizeof(s); |
115 | *--p = '\0'; | |
726f6388 JA |
116 | |
117 | if (n < 0) | |
118 | { | |
f73dda09 JA |
119 | do |
120 | *--p = '0' - n % 10; | |
121 | while ((n /= 10) != 0); | |
122 | ||
123 | *--p = '-'; | |
124 | } | |
125 | else | |
126 | { | |
127 | do | |
128 | *--p = '0' + n % 10; | |
129 | while ((n /= 10) != 0); | |
726f6388 JA |
130 | } |
131 | ||
f73dda09 | 132 | printf ("%s%s", p, addnl ? "\n" : ""); |
726f6388 JA |
133 | } |
134 | #endif /* RLIMTYPE */ | |
135 | ||
ccc6cda3 JA |
136 | /* **************************************************************** */ |
137 | /* */ | |
138 | /* Input Validation Functions */ | |
139 | /* */ | |
140 | /* **************************************************************** */ | |
141 | ||
142 | /* Return non-zero if all of the characters in STRING are digits. */ | |
143 | int | |
144 | all_digits (string) | |
145 | char *string; | |
146 | { | |
28ef6c31 JA |
147 | register char *s; |
148 | ||
149 | for (s = string; *s; s++) | |
f73dda09 | 150 | if (DIGIT (*s) == 0) |
28ef6c31 JA |
151 | return (0); |
152 | ||
ccc6cda3 JA |
153 | return (1); |
154 | } | |
155 | ||
156 | /* Return non-zero if the characters pointed to by STRING constitute a | |
157 | valid number. Stuff the converted number into RESULT if RESULT is | |
f73dda09 | 158 | not null. */ |
ccc6cda3 JA |
159 | int |
160 | legal_number (string, result) | |
161 | char *string; | |
7117c2d2 | 162 | intmax_t *result; |
ccc6cda3 | 163 | { |
7117c2d2 | 164 | intmax_t value; |
cce855bc | 165 | char *ep; |
ccc6cda3 JA |
166 | |
167 | if (result) | |
168 | *result = 0; | |
169 | ||
f73dda09 | 170 | errno = 0; |
7117c2d2 | 171 | value = strtoimax (string, &ep, 10); |
f73dda09 JA |
172 | if (errno) |
173 | return 0; /* errno is set on overflow or underflow */ | |
ccc6cda3 | 174 | |
7117c2d2 | 175 | /* Skip any trailing whitespace, since strtoimax does not. */ |
28ef6c31 JA |
176 | while (whitespace (*ep)) |
177 | ep++; | |
178 | ||
cce855bc JA |
179 | /* If *string is not '\0' but *ep is '\0' on return, the entire string |
180 | is valid. */ | |
181 | if (string && *string && *ep == '\0') | |
ccc6cda3 JA |
182 | { |
183 | if (result) | |
cce855bc JA |
184 | *result = value; |
185 | /* The SunOS4 implementation of strtol() will happily ignore | |
186 | overflow conditions, so this cannot do overflow correctly | |
187 | on those systems. */ | |
188 | return 1; | |
ccc6cda3 | 189 | } |
cce855bc JA |
190 | |
191 | return (0); | |
ccc6cda3 JA |
192 | } |
193 | ||
726f6388 JA |
194 | /* Return 1 if this token is a legal shell `identifier'; that is, it consists |
195 | solely of letters, digits, and underscores, and does not begin with a | |
196 | digit. */ | |
197 | int | |
198 | legal_identifier (name) | |
199 | char *name; | |
200 | { | |
201 | register char *s; | |
f73dda09 | 202 | unsigned char c; |
726f6388 | 203 | |
f73dda09 | 204 | if (!name || !(c = *name) || (legal_variable_starter (c) == 0)) |
726f6388 JA |
205 | return (0); |
206 | ||
f73dda09 | 207 | for (s = name + 1; (c = *s) != 0; s++) |
726f6388 | 208 | { |
f73dda09 | 209 | if (legal_variable_char (c) == 0) |
28ef6c31 | 210 | return (0); |
726f6388 JA |
211 | } |
212 | return (1); | |
213 | } | |
214 | ||
215 | /* Make sure that WORD is a valid shell identifier, i.e. | |
216 | does not contain a dollar sign, nor is quoted in any way. Nor | |
217 | does it consist of all digits. If CHECK_WORD is non-zero, | |
218 | the word is checked to ensure that it consists of only letters, | |
219 | digits, and underscores. */ | |
ccc6cda3 | 220 | int |
726f6388 JA |
221 | check_identifier (word, check_word) |
222 | WORD_DESC *word; | |
223 | int check_word; | |
224 | { | |
ccc6cda3 | 225 | if ((word->flags & (W_HASDOLLAR|W_QUOTED)) || all_digits (word->word)) |
726f6388 | 226 | { |
ccc6cda3 | 227 | internal_error ("`%s': not a valid identifier", word->word); |
726f6388 JA |
228 | return (0); |
229 | } | |
230 | else if (check_word && legal_identifier (word->word) == 0) | |
231 | { | |
ccc6cda3 | 232 | internal_error ("`%s': not a valid identifier", word->word); |
726f6388 JA |
233 | return (0); |
234 | } | |
235 | else | |
236 | return (1); | |
237 | } | |
238 | ||
7117c2d2 JA |
239 | /* Returns non-zero if STRING is an assignment statement. The returned value |
240 | is the index of the `=' sign. */ | |
241 | int | |
242 | assignment (string) | |
243 | const char *string; | |
244 | { | |
245 | register unsigned char c; | |
246 | register int newi, indx; | |
247 | ||
248 | c = string[indx = 0]; | |
249 | ||
250 | if (legal_variable_starter (c) == 0) | |
251 | return (0); | |
252 | ||
253 | while (c = string[indx]) | |
254 | { | |
255 | /* The following is safe. Note that '=' at the start of a word | |
256 | is not an assignment statement. */ | |
257 | if (c == '=') | |
258 | return (indx); | |
259 | ||
260 | #if defined (ARRAY_VARS) | |
261 | if (c == '[') | |
262 | { | |
263 | newi = skipsubscript (string, indx); | |
264 | if (string[newi++] != ']') | |
265 | return (0); | |
266 | return ((string[newi] == '=') ? newi : 0); | |
267 | } | |
268 | #endif /* ARRAY_VARS */ | |
269 | ||
270 | /* Variable names in assignment statements may contain only letters, | |
271 | digits, and `_'. */ | |
272 | if (legal_variable_char (c) == 0) | |
273 | return (0); | |
274 | ||
275 | indx++; | |
276 | } | |
277 | return (0); | |
278 | } | |
279 | ||
ccc6cda3 JA |
280 | /* **************************************************************** */ |
281 | /* */ | |
282 | /* Functions to manage files and file descriptors */ | |
283 | /* */ | |
284 | /* **************************************************************** */ | |
285 | ||
726f6388 JA |
286 | /* A function to unset no-delay mode on a file descriptor. Used in shell.c |
287 | to unset it on the fd passed as stdin. Should be called on stdin if | |
288 | readline gets an EAGAIN or EWOULDBLOCK when trying to read input. */ | |
289 | ||
290 | #if !defined (O_NDELAY) | |
291 | # if defined (FNDELAY) | |
292 | # define O_NDELAY FNDELAY | |
293 | # endif | |
294 | #endif /* O_NDELAY */ | |
295 | ||
296 | /* Make sure no-delay mode is not set on file descriptor FD. */ | |
bb70624e | 297 | int |
28ef6c31 | 298 | sh_unset_nodelay_mode (fd) |
726f6388 JA |
299 | int fd; |
300 | { | |
bb70624e | 301 | int flags, bflags; |
726f6388 JA |
302 | |
303 | if ((flags = fcntl (fd, F_GETFL, 0)) < 0) | |
bb70624e | 304 | return -1; |
726f6388 | 305 | |
bb70624e | 306 | bflags = 0; |
ccc6cda3 JA |
307 | |
308 | /* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present | |
309 | and O_NDELAY is defined. */ | |
bb70624e JA |
310 | #ifdef O_NONBLOCK |
311 | bflags |= O_NONBLOCK; | |
312 | #endif | |
313 | ||
314 | #ifdef O_NDELAY | |
315 | bflags |= O_NDELAY; | |
316 | #endif | |
317 | ||
318 | if (flags & bflags) | |
726f6388 | 319 | { |
bb70624e JA |
320 | flags &= ~bflags; |
321 | return (fcntl (fd, F_SETFL, flags)); | |
726f6388 | 322 | } |
726f6388 | 323 | |
bb70624e | 324 | return 0; |
726f6388 JA |
325 | } |
326 | ||
7117c2d2 JA |
327 | /* Return 1 if file descriptor FD is valid; 0 otherwise. */ |
328 | int | |
329 | sh_validfd (fd) | |
330 | int fd; | |
331 | { | |
332 | return (fcntl (fd, F_GETFD, 0) >= 0); | |
333 | } | |
334 | ||
b72432fd JA |
335 | /* There is a bug in the NeXT 2.1 rlogind that causes opens |
336 | of /dev/tty to fail. */ | |
337 | ||
338 | #if defined (__BEOS__) | |
339 | /* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it | |
340 | into a no-op. This should probably go away in the future. */ | |
341 | # undef O_NONBLOCK | |
342 | # define O_NONBLOCK 0 | |
343 | #endif /* __BEOS__ */ | |
344 | ||
726f6388 | 345 | void |
ccc6cda3 | 346 | check_dev_tty () |
726f6388 | 347 | { |
ccc6cda3 JA |
348 | int tty_fd; |
349 | char *tty; | |
726f6388 | 350 | |
d166f048 | 351 | tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK); |
726f6388 | 352 | |
ccc6cda3 | 353 | if (tty_fd < 0) |
726f6388 | 354 | { |
ccc6cda3 JA |
355 | tty = (char *)ttyname (fileno (stdin)); |
356 | if (tty == 0) | |
357 | return; | |
d166f048 | 358 | tty_fd = open (tty, O_RDWR|O_NONBLOCK); |
726f6388 | 359 | } |
ccc6cda3 | 360 | close (tty_fd); |
726f6388 JA |
361 | } |
362 | ||
ccc6cda3 JA |
363 | /* Return 1 if PATH1 and PATH2 are the same file. This is kind of |
364 | expensive. If non-NULL STP1 and STP2 point to stat structures | |
365 | corresponding to PATH1 and PATH2, respectively. */ | |
726f6388 | 366 | int |
ccc6cda3 JA |
367 | same_file (path1, path2, stp1, stp2) |
368 | char *path1, *path2; | |
369 | struct stat *stp1, *stp2; | |
726f6388 | 370 | { |
ccc6cda3 | 371 | struct stat st1, st2; |
726f6388 | 372 | |
ccc6cda3 | 373 | if (stp1 == NULL) |
726f6388 | 374 | { |
ccc6cda3 JA |
375 | if (stat (path1, &st1) != 0) |
376 | return (0); | |
377 | stp1 = &st1; | |
726f6388 | 378 | } |
726f6388 | 379 | |
ccc6cda3 JA |
380 | if (stp2 == NULL) |
381 | { | |
382 | if (stat (path2, &st2) != 0) | |
383 | return (0); | |
384 | stp2 = &st2; | |
385 | } | |
726f6388 | 386 | |
ccc6cda3 | 387 | return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino)); |
726f6388 JA |
388 | } |
389 | ||
ccc6cda3 JA |
390 | /* Move FD to a number close to the maximum number of file descriptors |
391 | allowed in the shell process, to avoid the user stepping on it with | |
392 | redirection and causing us extra work. If CHECK_NEW is non-zero, | |
393 | we check whether or not the file descriptors are in use before | |
d166f048 JA |
394 | duplicating FD onto them. MAXFD says where to start checking the |
395 | file descriptors. If it's less than 20, we get the maximum value | |
396 | available from getdtablesize(2). */ | |
726f6388 | 397 | int |
d166f048 JA |
398 | move_to_high_fd (fd, check_new, maxfd) |
399 | int fd, check_new, maxfd; | |
726f6388 | 400 | { |
ccc6cda3 | 401 | int script_fd, nfds, ignore; |
726f6388 | 402 | |
d166f048 JA |
403 | if (maxfd < 20) |
404 | { | |
405 | nfds = getdtablesize (); | |
406 | if (nfds <= 0) | |
407 | nfds = 20; | |
7117c2d2 JA |
408 | if (nfds > HIGH_FD_MAX) |
409 | nfds = HIGH_FD_MAX; /* reasonable maximum */ | |
d166f048 JA |
410 | } |
411 | else | |
412 | nfds = maxfd; | |
726f6388 | 413 | |
ccc6cda3 JA |
414 | for (nfds--; check_new && nfds > 3; nfds--) |
415 | if (fcntl (nfds, F_GETFD, &ignore) == -1) | |
416 | break; | |
726f6388 | 417 | |
7117c2d2 | 418 | if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1) |
ccc6cda3 JA |
419 | { |
420 | if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */ | |
421 | close (fd); | |
422 | return (script_fd); | |
423 | } | |
726f6388 | 424 | |
7117c2d2 JA |
425 | /* OK, we didn't find one less than our artificial maximum; return the |
426 | original file descriptor. */ | |
ccc6cda3 JA |
427 | return (fd); |
428 | } | |
429 | ||
430 | /* Return non-zero if the characters from SAMPLE are not all valid | |
431 | characters to be found in the first line of a shell script. We | |
432 | check up to the first newline, or SAMPLE_LEN, whichever comes first. | |
433 | All of the characters must be printable or whitespace. */ | |
726f6388 | 434 | |
726f6388 | 435 | int |
ccc6cda3 | 436 | check_binary_file (sample, sample_len) |
f73dda09 | 437 | char *sample; |
ccc6cda3 | 438 | int sample_len; |
726f6388 | 439 | { |
ccc6cda3 | 440 | register int i; |
f73dda09 | 441 | unsigned char c; |
726f6388 | 442 | |
ccc6cda3 JA |
443 | for (i = 0; i < sample_len; i++) |
444 | { | |
f73dda09 JA |
445 | c = sample[i]; |
446 | if (c == '\n') | |
ccc6cda3 | 447 | return (0); |
726f6388 | 448 | |
f73dda09 | 449 | if (ISSPACE (c) == 0 && ISPRINT (c) == 0) |
ccc6cda3 JA |
450 | return (1); |
451 | } | |
726f6388 | 452 | |
ccc6cda3 | 453 | return (0); |
726f6388 JA |
454 | } |
455 | ||
ccc6cda3 JA |
456 | /* **************************************************************** */ |
457 | /* */ | |
458 | /* Functions to manipulate pathnames */ | |
459 | /* */ | |
460 | /* **************************************************************** */ | |
726f6388 | 461 | |
726f6388 JA |
462 | /* Turn STRING (a pathname) into an absolute pathname, assuming that |
463 | DOT_PATH contains the symbolic location of `.'. This always | |
464 | returns a new string, even if STRING was an absolute pathname to | |
465 | begin with. */ | |
466 | char * | |
467 | make_absolute (string, dot_path) | |
468 | char *string, *dot_path; | |
469 | { | |
470 | char *result; | |
ccc6cda3 | 471 | |
28ef6c31 | 472 | if (dot_path == 0 || ABSPATH(string)) |
726f6388 JA |
473 | result = savestring (string); |
474 | else | |
bb70624e | 475 | result = sh_makepath (dot_path, string, 0); |
726f6388 JA |
476 | |
477 | return (result); | |
478 | } | |
479 | ||
28ef6c31 JA |
480 | /* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd' |
481 | to decide whether or not to look up a directory name in $CDPATH. */ | |
726f6388 JA |
482 | int |
483 | absolute_pathname (string) | |
f73dda09 | 484 | const char *string; |
726f6388 | 485 | { |
28ef6c31 | 486 | if (string == 0 || *string == '\0') |
726f6388 JA |
487 | return (0); |
488 | ||
28ef6c31 JA |
489 | if (ABSPATH(string)) |
490 | return (1); | |
491 | ||
492 | if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */ | |
493 | return (1); | |
494 | ||
495 | if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */ | |
726f6388 JA |
496 | return (1); |
497 | ||
726f6388 JA |
498 | return (0); |
499 | } | |
500 | ||
501 | /* Return 1 if STRING is an absolute program name; it is absolute if it | |
502 | contains any slashes. This is used to decide whether or not to look | |
503 | up through $PATH. */ | |
504 | int | |
505 | absolute_program (string) | |
f73dda09 | 506 | const char *string; |
726f6388 | 507 | { |
7117c2d2 | 508 | return ((char *)xstrchr (string, '/') != (char *)NULL); |
726f6388 JA |
509 | } |
510 | ||
511 | /* Return the `basename' of the pathname in STRING (the stuff after the | |
512 | last '/'). If STRING is not a full pathname, simply return it. */ | |
513 | char * | |
514 | base_pathname (string) | |
515 | char *string; | |
516 | { | |
517 | char *p; | |
518 | ||
28ef6c31 | 519 | if (absolute_pathname (string) == 0) |
726f6388 JA |
520 | return (string); |
521 | ||
522 | p = (char *)strrchr (string, '/'); | |
ccc6cda3 | 523 | return (p ? ++p : string); |
726f6388 JA |
524 | } |
525 | ||
526 | /* Return the full pathname of FILE. Easy. Filenames that begin | |
527 | with a '/' are returned as themselves. Other filenames have | |
528 | the current working directory prepended. A new string is | |
529 | returned in either case. */ | |
530 | char * | |
531 | full_pathname (file) | |
532 | char *file; | |
533 | { | |
bb70624e | 534 | char *ret; |
726f6388 | 535 | |
7117c2d2 | 536 | file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file); |
726f6388 | 537 | |
28ef6c31 | 538 | if (ABSPATH(file)) |
726f6388 JA |
539 | return (file); |
540 | ||
bb70624e JA |
541 | ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT)); |
542 | free (file); | |
726f6388 | 543 | |
bb70624e | 544 | return (ret); |
726f6388 | 545 | } |
726f6388 JA |
546 | |
547 | /* A slightly related function. Get the prettiest name of this | |
548 | directory possible. */ | |
ccc6cda3 | 549 | static char tdir[PATH_MAX]; |
726f6388 JA |
550 | |
551 | /* Return a pretty pathname. If the first part of the pathname is | |
552 | the same as $HOME, then replace that with `~'. */ | |
553 | char * | |
554 | polite_directory_format (name) | |
555 | char *name; | |
556 | { | |
ccc6cda3 JA |
557 | char *home; |
558 | int l; | |
726f6388 | 559 | |
ccc6cda3 JA |
560 | home = get_string_value ("HOME"); |
561 | l = home ? strlen (home) : 0; | |
726f6388 JA |
562 | if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/')) |
563 | { | |
e8ce775d | 564 | strncpy (tdir + 1, name + l, sizeof(tdir) - 2); |
726f6388 | 565 | tdir[0] = '~'; |
e8ce775d | 566 | tdir[sizeof(tdir) - 1] = '\0'; |
726f6388 JA |
567 | return (tdir); |
568 | } | |
569 | else | |
570 | return (name); | |
571 | } | |
572 | ||
ccc6cda3 JA |
573 | /* Given a string containing units of information separated by colons, |
574 | return the next one pointed to by (P_INDEX), or NULL if there are no more. | |
575 | Advance (P_INDEX) to the character after the colon. */ | |
576 | char * | |
577 | extract_colon_unit (string, p_index) | |
578 | char *string; | |
579 | int *p_index; | |
726f6388 | 580 | { |
ccc6cda3 JA |
581 | int i, start, len; |
582 | char *value; | |
726f6388 | 583 | |
ccc6cda3 JA |
584 | if (string == 0) |
585 | return (string); | |
726f6388 | 586 | |
ccc6cda3 JA |
587 | len = strlen (string); |
588 | if (*p_index >= len) | |
589 | return ((char *)NULL); | |
726f6388 | 590 | |
ccc6cda3 | 591 | i = *p_index; |
726f6388 | 592 | |
ccc6cda3 JA |
593 | /* Each call to this routine leaves the index pointing at a colon if |
594 | there is more to the path. If I is > 0, then increment past the | |
595 | `:'. If I is 0, then the path has a leading colon. Trailing colons | |
596 | are handled OK by the `else' part of the if statement; an empty | |
597 | string is returned in that case. */ | |
598 | if (i && string[i] == ':') | |
599 | i++; | |
600 | ||
601 | for (start = i; string[i] && string[i] != ':'; i++) | |
602 | ; | |
603 | ||
604 | *p_index = i; | |
605 | ||
606 | if (i == start) | |
607 | { | |
608 | if (string[i]) | |
609 | (*p_index)++; | |
610 | /* Return "" in the case of a trailing `:'. */ | |
f73dda09 | 611 | value = (char *)xmalloc (1); |
ccc6cda3 JA |
612 | value[0] = '\0'; |
613 | } | |
614 | else | |
bb70624e | 615 | value = substring (string, start, i); |
ccc6cda3 JA |
616 | |
617 | return (value); | |
726f6388 | 618 | } |
726f6388 JA |
619 | |
620 | /* **************************************************************** */ | |
621 | /* */ | |
622 | /* Tilde Initialization and Expansion */ | |
623 | /* */ | |
624 | /* **************************************************************** */ | |
625 | ||
cce855bc JA |
626 | #if defined (PUSHD_AND_POPD) |
627 | extern char *get_dirstack_from_string __P((char *)); | |
628 | #endif | |
629 | ||
f73dda09 JA |
630 | static char **bash_tilde_prefixes; |
631 | static char **bash_tilde_suffixes; | |
632 | ||
726f6388 JA |
633 | /* If tilde_expand hasn't been able to expand the text, perhaps it |
634 | is a special shell expansion. This function is installed as the | |
cce855bc JA |
635 | tilde_expansion_preexpansion_hook. It knows how to expand ~- and ~+. |
636 | If PUSHD_AND_POPD is defined, ~[+-]N expands to directories from the | |
637 | directory stack. */ | |
726f6388 | 638 | static char * |
d166f048 | 639 | bash_special_tilde_expansions (text) |
726f6388 JA |
640 | char *text; |
641 | { | |
ccc6cda3 | 642 | char *result; |
726f6388 | 643 | |
ccc6cda3 | 644 | result = (char *)NULL; |
cce855bc JA |
645 | |
646 | if (text[0] == '+' && text[1] == '\0') | |
647 | result = get_string_value ("PWD"); | |
648 | else if (text[0] == '-' && text[1] == '\0') | |
649 | result = get_string_value ("OLDPWD"); | |
650 | #if defined (PUSHD_AND_POPD) | |
f73dda09 | 651 | else if (DIGIT (*text) || ((*text == '+' || *text == '-') && DIGIT (text[1]))) |
cce855bc JA |
652 | result = get_dirstack_from_string (text); |
653 | #endif | |
726f6388 | 654 | |
ccc6cda3 | 655 | return (result ? savestring (result) : (char *)NULL); |
726f6388 JA |
656 | } |
657 | ||
658 | /* Initialize the tilde expander. In Bash, we handle `~-' and `~+', as | |
659 | well as handling special tilde prefixes; `:~" and `=~' are indications | |
660 | that we should do tilde expansion. */ | |
661 | void | |
662 | tilde_initialize () | |
663 | { | |
664 | static int times_called = 0; | |
665 | ||
d166f048 | 666 | /* Tell the tilde expander that we want a crack first. */ |
f73dda09 | 667 | tilde_expansion_preexpansion_hook = bash_special_tilde_expansions; |
726f6388 JA |
668 | |
669 | /* Tell the tilde expander about special strings which start a tilde | |
670 | expansion, and the special strings that end one. Only do this once. | |
671 | tilde_initialize () is called from within bashline_reinitialize (). */ | |
cce855bc | 672 | if (times_called++ == 0) |
726f6388 | 673 | { |
7117c2d2 | 674 | bash_tilde_prefixes = strvec_create (3); |
f73dda09 JA |
675 | bash_tilde_prefixes[0] = "=~"; |
676 | bash_tilde_prefixes[1] = ":~"; | |
677 | bash_tilde_prefixes[2] = (char *)NULL; | |
678 | ||
679 | tilde_additional_prefixes = bash_tilde_prefixes; | |
680 | ||
7117c2d2 | 681 | bash_tilde_suffixes = strvec_create (3); |
f73dda09 JA |
682 | bash_tilde_suffixes[0] = ":"; |
683 | bash_tilde_suffixes[1] = "=~"; /* XXX - ?? */ | |
684 | bash_tilde_suffixes[2] = (char *)NULL; | |
685 | ||
686 | tilde_additional_suffixes = bash_tilde_suffixes; | |
726f6388 | 687 | } |
726f6388 JA |
688 | } |
689 | ||
f73dda09 JA |
690 | /* POSIX.2, 3.6.1: A tilde-prefix consists of an unquoted tilde character |
691 | at the beginning of the word, followed by all of the characters preceding | |
692 | the first unquoted slash in the word, or all the characters in the word | |
693 | if there is no slash...If none of the characters in the tilde-prefix are | |
694 | quoted, the characters in the tilde-prefix following the tilde shell be | |
695 | treated as a possible login name. */ | |
696 | ||
697 | #define TILDE_END(c) ((c) == '\0' || (c) == '/' || (c) == ':') | |
698 | ||
699 | static int | |
700 | unquoted_tilde_word (s) | |
701 | const char *s; | |
702 | { | |
703 | const char *r; | |
704 | ||
705 | for (r = s; TILDE_END(*r) == 0; r++) | |
706 | { | |
707 | switch (*r) | |
708 | { | |
709 | case '\\': | |
710 | case '\'': | |
711 | case '"': | |
712 | return 0; | |
713 | } | |
714 | } | |
715 | return 1; | |
716 | } | |
717 | ||
7117c2d2 JA |
718 | /* Tilde-expand S by running it through the tilde expansion library. |
719 | ASSIGN_P is 1 if this is a variable assignment, so the alternate | |
720 | tilde prefixes should be enabled (`=~' and `:~', see above). */ | |
ccc6cda3 | 721 | char * |
7117c2d2 | 722 | bash_tilde_expand (s, assign_p) |
f73dda09 | 723 | const char *s; |
7117c2d2 | 724 | int assign_p; |
726f6388 | 725 | { |
f73dda09 | 726 | int old_immed, r; |
ccc6cda3 | 727 | char *ret; |
726f6388 | 728 | |
ccc6cda3 JA |
729 | old_immed = interrupt_immediately; |
730 | interrupt_immediately = 1; | |
7117c2d2 | 731 | tilde_additional_prefixes = assign_p ? bash_tilde_prefixes : (char **)0; |
f73dda09 JA |
732 | r = (*s == '~') ? unquoted_tilde_word (s) : 1; |
733 | ret = r ? tilde_expand (s) : savestring (s); | |
ccc6cda3 JA |
734 | interrupt_immediately = old_immed; |
735 | return (ret); | |
726f6388 | 736 | } |
d166f048 JA |
737 | |
738 | /* **************************************************************** */ | |
739 | /* */ | |
740 | /* Functions to manipulate and search the group list */ | |
741 | /* */ | |
742 | /* **************************************************************** */ | |
743 | ||
744 | static int ngroups, maxgroups; | |
745 | ||
746 | /* The set of groups that this user is a member of. */ | |
747 | static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL; | |
748 | ||
749 | #if !defined (NOGROUP) | |
750 | # define NOGROUP (gid_t) -1 | |
751 | #endif | |
752 | ||
d166f048 JA |
753 | static void |
754 | initialize_group_array () | |
755 | { | |
756 | register int i; | |
757 | ||
758 | if (maxgroups == 0) | |
759 | maxgroups = getmaxgroups (); | |
760 | ||
761 | ngroups = 0; | |
762 | group_array = (GETGROUPS_T *)xrealloc (group_array, maxgroups * sizeof (GETGROUPS_T)); | |
763 | ||
764 | #if defined (HAVE_GETGROUPS) | |
765 | ngroups = getgroups (maxgroups, group_array); | |
766 | #endif | |
767 | ||
768 | /* If getgroups returns nothing, or the OS does not support getgroups(), | |
769 | make sure the groups array includes at least the current gid. */ | |
770 | if (ngroups == 0) | |
771 | { | |
772 | group_array[0] = current_user.gid; | |
773 | ngroups = 1; | |
774 | } | |
775 | ||
776 | /* If the primary group is not in the groups array, add it as group_array[0] | |
777 | and shuffle everything else up 1, if there's room. */ | |
778 | for (i = 0; i < ngroups; i++) | |
779 | if (current_user.gid == (gid_t)group_array[i]) | |
780 | break; | |
781 | if (i == ngroups && ngroups < maxgroups) | |
782 | { | |
783 | for (i = ngroups; i > 0; i--) | |
28ef6c31 | 784 | group_array[i] = group_array[i - 1]; |
d166f048 JA |
785 | group_array[0] = current_user.gid; |
786 | ngroups++; | |
787 | } | |
cce855bc JA |
788 | |
789 | /* If the primary group is not group_array[0], swap group_array[0] and | |
790 | whatever the current group is. The vast majority of systems should | |
791 | not need this; a notable exception is Linux. */ | |
792 | if (group_array[0] != current_user.gid) | |
793 | { | |
794 | for (i = 0; i < ngroups; i++) | |
28ef6c31 JA |
795 | if (group_array[i] == current_user.gid) |
796 | break; | |
cce855bc JA |
797 | if (i < ngroups) |
798 | { | |
799 | group_array[i] = group_array[0]; | |
800 | group_array[0] = current_user.gid; | |
801 | } | |
802 | } | |
d166f048 JA |
803 | } |
804 | ||
805 | /* Return non-zero if GID is one that we have in our groups list. */ | |
806 | int | |
cce855bc JA |
807 | #if defined (__STDC__) || defined ( _MINIX) |
808 | group_member (gid_t gid) | |
809 | #else | |
d166f048 JA |
810 | group_member (gid) |
811 | gid_t gid; | |
cce855bc | 812 | #endif /* !__STDC__ && !_MINIX */ |
d166f048 JA |
813 | { |
814 | #if defined (HAVE_GETGROUPS) | |
815 | register int i; | |
816 | #endif | |
817 | ||
818 | /* Short-circuit if possible, maybe saving a call to getgroups(). */ | |
819 | if (gid == current_user.gid || gid == current_user.egid) | |
820 | return (1); | |
821 | ||
822 | #if defined (HAVE_GETGROUPS) | |
823 | if (ngroups == 0) | |
824 | initialize_group_array (); | |
825 | ||
826 | /* In case of error, the user loses. */ | |
827 | if (ngroups <= 0) | |
828 | return (0); | |
829 | ||
830 | /* Search through the list looking for GID. */ | |
831 | for (i = 0; i < ngroups; i++) | |
832 | if (gid == (gid_t)group_array[i]) | |
833 | return (1); | |
834 | #endif | |
835 | ||
836 | return (0); | |
837 | } | |
838 | ||
839 | char ** | |
840 | get_group_list (ngp) | |
841 | int *ngp; | |
842 | { | |
843 | static char **group_vector = (char **)NULL; | |
844 | register int i; | |
d166f048 JA |
845 | |
846 | if (group_vector) | |
847 | { | |
848 | if (ngp) | |
849 | *ngp = ngroups; | |
850 | return group_vector; | |
851 | } | |
852 | ||
853 | if (ngroups == 0) | |
854 | initialize_group_array (); | |
855 | ||
856 | if (ngroups <= 0) | |
857 | { | |
858 | if (ngp) | |
859 | *ngp = 0; | |
860 | return (char **)NULL; | |
861 | } | |
862 | ||
7117c2d2 | 863 | group_vector = strvec_create (ngroups); |
d166f048 | 864 | for (i = 0; i < ngroups; i++) |
7117c2d2 | 865 | group_vector[i] = itos (group_array[i]); |
b72432fd | 866 | |
d166f048 JA |
867 | if (ngp) |
868 | *ngp = ngroups; | |
869 | return group_vector; | |
870 | } | |
b72432fd JA |
871 | |
872 | int * | |
873 | get_group_array (ngp) | |
874 | int *ngp; | |
875 | { | |
876 | int i; | |
877 | static int *group_iarray = (int *)NULL; | |
878 | ||
879 | if (group_iarray) | |
880 | { | |
881 | if (ngp) | |
882 | *ngp = ngroups; | |
883 | return (group_iarray); | |
884 | } | |
885 | ||
886 | if (ngroups == 0) | |
887 | initialize_group_array (); | |
888 | ||
889 | if (ngroups <= 0) | |
890 | { | |
891 | if (ngp) | |
892 | *ngp = 0; | |
893 | return (int *)NULL; | |
894 | } | |
895 | ||
896 | group_iarray = (int *)xmalloc (ngroups * sizeof (int)); | |
897 | for (i = 0; i < ngroups; i++) | |
898 | group_iarray[i] = (int)group_array[i]; | |
899 | ||
900 | if (ngp) | |
901 | *ngp = ngroups; | |
902 | return group_iarray; | |
903 | } |