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Commit | Line | Data |
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726f6388 JA |
1 | /* general.c -- Stuff that is used by all files. */ |
2 | ||
4931aca6 | 3 | /* Copyright (C) 1987-2004 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 | ||
5e13499c CR |
39 | #include "bashintl.h" |
40 | ||
726f6388 | 41 | #include "shell.h" |
e6e3b444 CR |
42 | #include "test.h" |
43 | ||
726f6388 JA |
44 | #include <tilde/tilde.h> |
45 | ||
726f6388 JA |
46 | #if !defined (errno) |
47 | extern int errno; | |
48 | #endif /* !errno */ | |
49 | ||
f73dda09 | 50 | extern int expand_aliases; |
ccc6cda3 JA |
51 | extern int interrupt_immediately; |
52 | extern int interactive_comments; | |
28ef6c31 JA |
53 | extern int check_hashed_filenames; |
54 | extern int source_uses_path; | |
55 | extern int source_searches_cwd; | |
cce855bc | 56 | |
7117c2d2 JA |
57 | static char *bash_special_tilde_expansions __P((char *)); |
58 | static int unquoted_tilde_word __P((const char *)); | |
59 | static void initialize_group_array __P((void)); | |
60 | ||
cce855bc | 61 | /* A standard error message to use when getcwd() returns NULL. */ |
5e13499c | 62 | char *bash_getcwd_errstr = N_("getcwd: cannot access parent directories"); |
726f6388 | 63 | |
ccc6cda3 | 64 | /* Do whatever is necessary to initialize `Posix mode'. */ |
726f6388 | 65 | void |
ccc6cda3 JA |
66 | posix_initialize (on) |
67 | int on; | |
726f6388 | 68 | { |
28ef6c31 JA |
69 | /* Things that should be turned on when posix mode is enabled. */ |
70 | if (on != 0) | |
71 | { | |
72 | interactive_comments = source_uses_path = expand_aliases = 1; | |
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++; | |
101 | if (*s == '-' || *s == '+') | |
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) | |
165 | 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); |
f73dda09 JA |
176 | if (errno) |
177 | return 0; /* errno is set on overflow or underflow */ | |
ccc6cda3 | 178 | |
7117c2d2 | 179 | /* Skip any trailing whitespace, since strtoimax does not. */ |
28ef6c31 JA |
180 | while (whitespace (*ep)) |
181 | ep++; | |
182 | ||
cce855bc JA |
183 | /* If *string is not '\0' but *ep is '\0' on return, the entire string |
184 | is valid. */ | |
185 | if (string && *string && *ep == '\0') | |
ccc6cda3 JA |
186 | { |
187 | if (result) | |
cce855bc JA |
188 | *result = value; |
189 | /* The SunOS4 implementation of strtol() will happily ignore | |
190 | overflow conditions, so this cannot do overflow correctly | |
191 | on those systems. */ | |
192 | return 1; | |
ccc6cda3 | 193 | } |
cce855bc JA |
194 | |
195 | return (0); | |
ccc6cda3 JA |
196 | } |
197 | ||
726f6388 JA |
198 | /* Return 1 if this token is a legal shell `identifier'; that is, it consists |
199 | solely of letters, digits, and underscores, and does not begin with a | |
200 | digit. */ | |
201 | int | |
202 | legal_identifier (name) | |
203 | char *name; | |
204 | { | |
205 | register char *s; | |
f73dda09 | 206 | unsigned char c; |
726f6388 | 207 | |
f73dda09 | 208 | if (!name || !(c = *name) || (legal_variable_starter (c) == 0)) |
726f6388 JA |
209 | return (0); |
210 | ||
f73dda09 | 211 | for (s = name + 1; (c = *s) != 0; s++) |
726f6388 | 212 | { |
f73dda09 | 213 | if (legal_variable_char (c) == 0) |
28ef6c31 | 214 | return (0); |
726f6388 JA |
215 | } |
216 | return (1); | |
217 | } | |
218 | ||
219 | /* Make sure that WORD is a valid shell identifier, i.e. | |
220 | does not contain a dollar sign, nor is quoted in any way. Nor | |
221 | does it consist of all digits. If CHECK_WORD is non-zero, | |
222 | the word is checked to ensure that it consists of only letters, | |
223 | digits, and underscores. */ | |
ccc6cda3 | 224 | int |
726f6388 JA |
225 | check_identifier (word, check_word) |
226 | WORD_DESC *word; | |
227 | int check_word; | |
228 | { | |
ccc6cda3 | 229 | if ((word->flags & (W_HASDOLLAR|W_QUOTED)) || all_digits (word->word)) |
726f6388 | 230 | { |
5e13499c | 231 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
232 | return (0); |
233 | } | |
234 | else if (check_word && legal_identifier (word->word) == 0) | |
235 | { | |
5e13499c | 236 | internal_error (_("`%s': not a valid identifier"), word->word); |
726f6388 JA |
237 | return (0); |
238 | } | |
239 | else | |
240 | return (1); | |
241 | } | |
242 | ||
1d7ecd77 CR |
243 | /* Return 1 if STRING comprises a valid alias name. The shell accepts |
244 | essentially all characters except those which must be quoted to the | |
245 | parser (which disqualifies them from alias expansion anyway) and `/'. */ | |
246 | int | |
247 | legal_alias_name (string, flags) | |
248 | char *string; | |
249 | int flags; | |
250 | { | |
251 | register char *s; | |
252 | ||
253 | for (s = string; *s; s++) | |
254 | if (shellbreak (*s) || shellxquote (*s) || shellexp (*s) || (*s == '/')) | |
255 | return 0; | |
256 | return 1; | |
257 | } | |
258 | ||
7117c2d2 JA |
259 | /* Returns non-zero if STRING is an assignment statement. The returned value |
260 | is the index of the `=' sign. */ | |
261 | int | |
5e13499c | 262 | assignment (string, flags) |
7117c2d2 | 263 | const char *string; |
5e13499c | 264 | int flags; |
7117c2d2 JA |
265 | { |
266 | register unsigned char c; | |
267 | register int newi, indx; | |
268 | ||
269 | c = string[indx = 0]; | |
270 | ||
5e13499c CR |
271 | #if defined (ARRAY_VARS) |
272 | if ((legal_variable_starter (c) == 0) && (flags && c != '[')) /* ] */ | |
273 | #else | |
7117c2d2 | 274 | if (legal_variable_starter (c) == 0) |
5e13499c | 275 | #endif |
7117c2d2 JA |
276 | return (0); |
277 | ||
278 | while (c = string[indx]) | |
279 | { | |
280 | /* The following is safe. Note that '=' at the start of a word | |
281 | is not an assignment statement. */ | |
282 | if (c == '=') | |
283 | return (indx); | |
284 | ||
285 | #if defined (ARRAY_VARS) | |
286 | if (c == '[') | |
287 | { | |
288 | newi = skipsubscript (string, indx); | |
289 | if (string[newi++] != ']') | |
290 | return (0); | |
291 | return ((string[newi] == '=') ? newi : 0); | |
292 | } | |
293 | #endif /* ARRAY_VARS */ | |
294 | ||
295 | /* Variable names in assignment statements may contain only letters, | |
296 | digits, and `_'. */ | |
297 | if (legal_variable_char (c) == 0) | |
298 | return (0); | |
299 | ||
300 | indx++; | |
301 | } | |
302 | return (0); | |
303 | } | |
304 | ||
ccc6cda3 JA |
305 | /* **************************************************************** */ |
306 | /* */ | |
307 | /* Functions to manage files and file descriptors */ | |
308 | /* */ | |
309 | /* **************************************************************** */ | |
310 | ||
726f6388 JA |
311 | /* A function to unset no-delay mode on a file descriptor. Used in shell.c |
312 | to unset it on the fd passed as stdin. Should be called on stdin if | |
313 | readline gets an EAGAIN or EWOULDBLOCK when trying to read input. */ | |
314 | ||
315 | #if !defined (O_NDELAY) | |
316 | # if defined (FNDELAY) | |
317 | # define O_NDELAY FNDELAY | |
318 | # endif | |
319 | #endif /* O_NDELAY */ | |
320 | ||
321 | /* Make sure no-delay mode is not set on file descriptor FD. */ | |
bb70624e | 322 | int |
28ef6c31 | 323 | sh_unset_nodelay_mode (fd) |
726f6388 JA |
324 | int fd; |
325 | { | |
bb70624e | 326 | int flags, bflags; |
726f6388 JA |
327 | |
328 | if ((flags = fcntl (fd, F_GETFL, 0)) < 0) | |
bb70624e | 329 | return -1; |
726f6388 | 330 | |
bb70624e | 331 | bflags = 0; |
ccc6cda3 JA |
332 | |
333 | /* This is defined to O_NDELAY in filecntl.h if O_NONBLOCK is not present | |
334 | and O_NDELAY is defined. */ | |
bb70624e JA |
335 | #ifdef O_NONBLOCK |
336 | bflags |= O_NONBLOCK; | |
337 | #endif | |
338 | ||
339 | #ifdef O_NDELAY | |
340 | bflags |= O_NDELAY; | |
341 | #endif | |
342 | ||
343 | if (flags & bflags) | |
726f6388 | 344 | { |
bb70624e JA |
345 | flags &= ~bflags; |
346 | return (fcntl (fd, F_SETFL, flags)); | |
726f6388 | 347 | } |
726f6388 | 348 | |
bb70624e | 349 | return 0; |
726f6388 JA |
350 | } |
351 | ||
7117c2d2 JA |
352 | /* Return 1 if file descriptor FD is valid; 0 otherwise. */ |
353 | int | |
354 | sh_validfd (fd) | |
355 | int fd; | |
356 | { | |
357 | return (fcntl (fd, F_GETFD, 0) >= 0); | |
358 | } | |
359 | ||
b72432fd JA |
360 | /* There is a bug in the NeXT 2.1 rlogind that causes opens |
361 | of /dev/tty to fail. */ | |
362 | ||
363 | #if defined (__BEOS__) | |
364 | /* On BeOS, opening in non-blocking mode exposes a bug in BeOS, so turn it | |
365 | into a no-op. This should probably go away in the future. */ | |
366 | # undef O_NONBLOCK | |
367 | # define O_NONBLOCK 0 | |
368 | #endif /* __BEOS__ */ | |
369 | ||
726f6388 | 370 | void |
ccc6cda3 | 371 | check_dev_tty () |
726f6388 | 372 | { |
ccc6cda3 JA |
373 | int tty_fd; |
374 | char *tty; | |
726f6388 | 375 | |
d166f048 | 376 | tty_fd = open ("/dev/tty", O_RDWR|O_NONBLOCK); |
726f6388 | 377 | |
ccc6cda3 | 378 | if (tty_fd < 0) |
726f6388 | 379 | { |
ccc6cda3 JA |
380 | tty = (char *)ttyname (fileno (stdin)); |
381 | if (tty == 0) | |
382 | return; | |
d166f048 | 383 | tty_fd = open (tty, O_RDWR|O_NONBLOCK); |
726f6388 | 384 | } |
ccc6cda3 | 385 | close (tty_fd); |
726f6388 JA |
386 | } |
387 | ||
ccc6cda3 JA |
388 | /* Return 1 if PATH1 and PATH2 are the same file. This is kind of |
389 | expensive. If non-NULL STP1 and STP2 point to stat structures | |
390 | corresponding to PATH1 and PATH2, respectively. */ | |
726f6388 | 391 | int |
ccc6cda3 JA |
392 | same_file (path1, path2, stp1, stp2) |
393 | char *path1, *path2; | |
394 | struct stat *stp1, *stp2; | |
726f6388 | 395 | { |
ccc6cda3 | 396 | struct stat st1, st2; |
726f6388 | 397 | |
ccc6cda3 | 398 | if (stp1 == NULL) |
726f6388 | 399 | { |
ccc6cda3 JA |
400 | if (stat (path1, &st1) != 0) |
401 | return (0); | |
402 | stp1 = &st1; | |
726f6388 | 403 | } |
726f6388 | 404 | |
ccc6cda3 JA |
405 | if (stp2 == NULL) |
406 | { | |
407 | if (stat (path2, &st2) != 0) | |
408 | return (0); | |
409 | stp2 = &st2; | |
410 | } | |
726f6388 | 411 | |
ccc6cda3 | 412 | return ((stp1->st_dev == stp2->st_dev) && (stp1->st_ino == stp2->st_ino)); |
726f6388 JA |
413 | } |
414 | ||
ccc6cda3 JA |
415 | /* Move FD to a number close to the maximum number of file descriptors |
416 | allowed in the shell process, to avoid the user stepping on it with | |
417 | redirection and causing us extra work. If CHECK_NEW is non-zero, | |
418 | we check whether or not the file descriptors are in use before | |
d166f048 JA |
419 | duplicating FD onto them. MAXFD says where to start checking the |
420 | file descriptors. If it's less than 20, we get the maximum value | |
421 | available from getdtablesize(2). */ | |
726f6388 | 422 | int |
d166f048 JA |
423 | move_to_high_fd (fd, check_new, maxfd) |
424 | int fd, check_new, maxfd; | |
726f6388 | 425 | { |
ccc6cda3 | 426 | int script_fd, nfds, ignore; |
726f6388 | 427 | |
d166f048 JA |
428 | if (maxfd < 20) |
429 | { | |
430 | nfds = getdtablesize (); | |
431 | if (nfds <= 0) | |
432 | nfds = 20; | |
7117c2d2 JA |
433 | if (nfds > HIGH_FD_MAX) |
434 | nfds = HIGH_FD_MAX; /* reasonable maximum */ | |
d166f048 JA |
435 | } |
436 | else | |
437 | nfds = maxfd; | |
726f6388 | 438 | |
ccc6cda3 JA |
439 | for (nfds--; check_new && nfds > 3; nfds--) |
440 | if (fcntl (nfds, F_GETFD, &ignore) == -1) | |
441 | break; | |
726f6388 | 442 | |
7117c2d2 | 443 | if (nfds > 3 && fd != nfds && (script_fd = dup2 (fd, nfds)) != -1) |
ccc6cda3 JA |
444 | { |
445 | if (check_new == 0 || fd != fileno (stderr)) /* don't close stderr */ | |
446 | close (fd); | |
447 | return (script_fd); | |
448 | } | |
726f6388 | 449 | |
7117c2d2 JA |
450 | /* OK, we didn't find one less than our artificial maximum; return the |
451 | original file descriptor. */ | |
ccc6cda3 JA |
452 | return (fd); |
453 | } | |
454 | ||
455 | /* Return non-zero if the characters from SAMPLE are not all valid | |
456 | characters to be found in the first line of a shell script. We | |
457 | check up to the first newline, or SAMPLE_LEN, whichever comes first. | |
458 | All of the characters must be printable or whitespace. */ | |
726f6388 | 459 | |
726f6388 | 460 | int |
ccc6cda3 | 461 | check_binary_file (sample, sample_len) |
f73dda09 | 462 | char *sample; |
ccc6cda3 | 463 | int sample_len; |
726f6388 | 464 | { |
ccc6cda3 | 465 | register int i; |
f73dda09 | 466 | unsigned char c; |
726f6388 | 467 | |
ccc6cda3 JA |
468 | for (i = 0; i < sample_len; i++) |
469 | { | |
f73dda09 JA |
470 | c = sample[i]; |
471 | if (c == '\n') | |
ccc6cda3 | 472 | return (0); |
726f6388 | 473 | |
f73dda09 | 474 | if (ISSPACE (c) == 0 && ISPRINT (c) == 0) |
ccc6cda3 JA |
475 | return (1); |
476 | } | |
726f6388 | 477 | |
ccc6cda3 | 478 | return (0); |
726f6388 JA |
479 | } |
480 | ||
fb65be05 CR |
481 | /* **************************************************************** */ |
482 | /* */ | |
483 | /* Functions to inspect pathnames */ | |
484 | /* */ | |
485 | /* **************************************************************** */ | |
486 | ||
487 | int | |
488 | file_isdir (fn) | |
489 | char *fn; | |
490 | { | |
491 | struct stat sb; | |
492 | ||
493 | return ((stat (fn, &sb) == 0) && S_ISDIR (sb.st_mode)); | |
494 | } | |
495 | ||
496 | int | |
497 | file_iswdir (fn) | |
498 | char *fn; | |
499 | { | |
500 | return (file_isdir (fn) && test_eaccess (fn, W_OK) == 0); | |
501 | } | |
502 | ||
503 | ||
ccc6cda3 JA |
504 | /* **************************************************************** */ |
505 | /* */ | |
506 | /* Functions to manipulate pathnames */ | |
507 | /* */ | |
508 | /* **************************************************************** */ | |
726f6388 | 509 | |
726f6388 JA |
510 | /* Turn STRING (a pathname) into an absolute pathname, assuming that |
511 | DOT_PATH contains the symbolic location of `.'. This always | |
512 | returns a new string, even if STRING was an absolute pathname to | |
513 | begin with. */ | |
514 | char * | |
515 | make_absolute (string, dot_path) | |
516 | char *string, *dot_path; | |
517 | { | |
518 | char *result; | |
ccc6cda3 | 519 | |
28ef6c31 | 520 | if (dot_path == 0 || ABSPATH(string)) |
d3a24ed2 CR |
521 | #ifdef __CYGWIN__ |
522 | { | |
523 | char pathbuf[PATH_MAX + 1]; | |
524 | ||
525 | cygwin_conv_to_full_posix_path (string, pathbuf); | |
526 | result = savestring (pathbuf); | |
527 | } | |
528 | #else | |
726f6388 | 529 | result = savestring (string); |
d3a24ed2 | 530 | #endif |
726f6388 | 531 | else |
bb70624e | 532 | result = sh_makepath (dot_path, string, 0); |
726f6388 JA |
533 | |
534 | return (result); | |
535 | } | |
536 | ||
28ef6c31 JA |
537 | /* Return 1 if STRING contains an absolute pathname, else 0. Used by `cd' |
538 | to decide whether or not to look up a directory name in $CDPATH. */ | |
726f6388 JA |
539 | int |
540 | absolute_pathname (string) | |
f73dda09 | 541 | const char *string; |
726f6388 | 542 | { |
28ef6c31 | 543 | if (string == 0 || *string == '\0') |
726f6388 JA |
544 | return (0); |
545 | ||
28ef6c31 JA |
546 | if (ABSPATH(string)) |
547 | return (1); | |
548 | ||
549 | if (string[0] == '.' && PATHSEP(string[1])) /* . and ./ */ | |
550 | return (1); | |
551 | ||
552 | if (string[0] == '.' && string[1] == '.' && PATHSEP(string[2])) /* .. and ../ */ | |
726f6388 JA |
553 | return (1); |
554 | ||
726f6388 JA |
555 | return (0); |
556 | } | |
557 | ||
558 | /* Return 1 if STRING is an absolute program name; it is absolute if it | |
559 | contains any slashes. This is used to decide whether or not to look | |
560 | up through $PATH. */ | |
561 | int | |
562 | absolute_program (string) | |
f73dda09 | 563 | const char *string; |
726f6388 | 564 | { |
7117c2d2 | 565 | return ((char *)xstrchr (string, '/') != (char *)NULL); |
726f6388 JA |
566 | } |
567 | ||
568 | /* Return the `basename' of the pathname in STRING (the stuff after the | |
898cc92e | 569 | last '/'). If STRING is `/', just return it. */ |
726f6388 JA |
570 | char * |
571 | base_pathname (string) | |
572 | char *string; | |
573 | { | |
574 | char *p; | |
575 | ||
898cc92e | 576 | #if 0 |
28ef6c31 | 577 | if (absolute_pathname (string) == 0) |
726f6388 | 578 | return (string); |
898cc92e CR |
579 | #endif |
580 | ||
581 | if (string[0] == '/' && string[1] == 0) | |
582 | return (string); | |
726f6388 JA |
583 | |
584 | p = (char *)strrchr (string, '/'); | |
ccc6cda3 | 585 | return (p ? ++p : string); |
726f6388 JA |
586 | } |
587 | ||
588 | /* Return the full pathname of FILE. Easy. Filenames that begin | |
589 | with a '/' are returned as themselves. Other filenames have | |
590 | the current working directory prepended. A new string is | |
591 | returned in either case. */ | |
592 | char * | |
593 | full_pathname (file) | |
594 | char *file; | |
595 | { | |
bb70624e | 596 | char *ret; |
726f6388 | 597 | |
7117c2d2 | 598 | file = (*file == '~') ? bash_tilde_expand (file, 0) : savestring (file); |
726f6388 | 599 | |
28ef6c31 | 600 | if (ABSPATH(file)) |
726f6388 JA |
601 | return (file); |
602 | ||
bb70624e JA |
603 | ret = sh_makepath ((char *)NULL, file, (MP_DOCWD|MP_RMDOT)); |
604 | free (file); | |
726f6388 | 605 | |
bb70624e | 606 | return (ret); |
726f6388 | 607 | } |
726f6388 JA |
608 | |
609 | /* A slightly related function. Get the prettiest name of this | |
610 | directory possible. */ | |
ccc6cda3 | 611 | static char tdir[PATH_MAX]; |
726f6388 JA |
612 | |
613 | /* Return a pretty pathname. If the first part of the pathname is | |
614 | the same as $HOME, then replace that with `~'. */ | |
615 | char * | |
616 | polite_directory_format (name) | |
617 | char *name; | |
618 | { | |
ccc6cda3 JA |
619 | char *home; |
620 | int l; | |
726f6388 | 621 | |
ccc6cda3 JA |
622 | home = get_string_value ("HOME"); |
623 | l = home ? strlen (home) : 0; | |
726f6388 JA |
624 | if (l > 1 && strncmp (home, name, l) == 0 && (!name[l] || name[l] == '/')) |
625 | { | |
e8ce775d | 626 | strncpy (tdir + 1, name + l, sizeof(tdir) - 2); |
726f6388 | 627 | tdir[0] = '~'; |
e8ce775d | 628 | tdir[sizeof(tdir) - 1] = '\0'; |
726f6388 JA |
629 | return (tdir); |
630 | } | |
631 | else | |
632 | return (name); | |
633 | } | |
634 | ||
ccc6cda3 JA |
635 | /* Given a string containing units of information separated by colons, |
636 | return the next one pointed to by (P_INDEX), or NULL if there are no more. | |
637 | Advance (P_INDEX) to the character after the colon. */ | |
638 | char * | |
639 | extract_colon_unit (string, p_index) | |
640 | char *string; | |
641 | int *p_index; | |
726f6388 | 642 | { |
ccc6cda3 JA |
643 | int i, start, len; |
644 | char *value; | |
726f6388 | 645 | |
ccc6cda3 JA |
646 | if (string == 0) |
647 | return (string); | |
726f6388 | 648 | |
ccc6cda3 JA |
649 | len = strlen (string); |
650 | if (*p_index >= len) | |
651 | return ((char *)NULL); | |
726f6388 | 652 | |
ccc6cda3 | 653 | i = *p_index; |
726f6388 | 654 | |
ccc6cda3 JA |
655 | /* Each call to this routine leaves the index pointing at a colon if |
656 | there is more to the path. If I is > 0, then increment past the | |
657 | `:'. If I is 0, then the path has a leading colon. Trailing colons | |
658 | are handled OK by the `else' part of the if statement; an empty | |
659 | string is returned in that case. */ | |
660 | if (i && string[i] == ':') | |
661 | i++; | |
662 | ||
663 | for (start = i; string[i] && string[i] != ':'; i++) | |
664 | ; | |
665 | ||
666 | *p_index = i; | |
667 | ||
668 | if (i == start) | |
669 | { | |
670 | if (string[i]) | |
671 | (*p_index)++; | |
672 | /* Return "" in the case of a trailing `:'. */ | |
f73dda09 | 673 | value = (char *)xmalloc (1); |
ccc6cda3 JA |
674 | value[0] = '\0'; |
675 | } | |
676 | else | |
bb70624e | 677 | value = substring (string, start, i); |
ccc6cda3 JA |
678 | |
679 | return (value); | |
726f6388 | 680 | } |
726f6388 JA |
681 | |
682 | /* **************************************************************** */ | |
683 | /* */ | |
684 | /* Tilde Initialization and Expansion */ | |
685 | /* */ | |
686 | /* **************************************************************** */ | |
687 | ||
cce855bc JA |
688 | #if defined (PUSHD_AND_POPD) |
689 | extern char *get_dirstack_from_string __P((char *)); | |
690 | #endif | |
691 | ||
f73dda09 JA |
692 | static char **bash_tilde_prefixes; |
693 | static char **bash_tilde_suffixes; | |
694 | ||
726f6388 JA |
695 | /* If tilde_expand hasn't been able to expand the text, perhaps it |
696 | is a special shell expansion. This function is installed as the | |
cce855bc JA |
697 | tilde_expansion_preexpansion_hook. It knows how to expand ~- and ~+. |
698 | If PUSHD_AND_POPD is defined, ~[+-]N expands to directories from the | |
699 | directory stack. */ | |
726f6388 | 700 | static char * |
d166f048 | 701 | bash_special_tilde_expansions (text) |
726f6388 JA |
702 | char *text; |
703 | { | |
ccc6cda3 | 704 | char *result; |
726f6388 | 705 | |
ccc6cda3 | 706 | result = (char *)NULL; |
cce855bc JA |
707 | |
708 | if (text[0] == '+' && text[1] == '\0') | |
709 | result = get_string_value ("PWD"); | |
710 | else if (text[0] == '-' && text[1] == '\0') | |
711 | result = get_string_value ("OLDPWD"); | |
712 | #if defined (PUSHD_AND_POPD) | |
f73dda09 | 713 | else if (DIGIT (*text) || ((*text == '+' || *text == '-') && DIGIT (text[1]))) |
cce855bc JA |
714 | result = get_dirstack_from_string (text); |
715 | #endif | |
726f6388 | 716 | |
ccc6cda3 | 717 | return (result ? savestring (result) : (char *)NULL); |
726f6388 JA |
718 | } |
719 | ||
720 | /* Initialize the tilde expander. In Bash, we handle `~-' and `~+', as | |
721 | well as handling special tilde prefixes; `:~" and `=~' are indications | |
722 | that we should do tilde expansion. */ | |
723 | void | |
724 | tilde_initialize () | |
725 | { | |
726 | static int times_called = 0; | |
727 | ||
d166f048 | 728 | /* Tell the tilde expander that we want a crack first. */ |
f73dda09 | 729 | tilde_expansion_preexpansion_hook = bash_special_tilde_expansions; |
726f6388 JA |
730 | |
731 | /* Tell the tilde expander about special strings which start a tilde | |
732 | expansion, and the special strings that end one. Only do this once. | |
733 | tilde_initialize () is called from within bashline_reinitialize (). */ | |
cce855bc | 734 | if (times_called++ == 0) |
726f6388 | 735 | { |
7117c2d2 | 736 | bash_tilde_prefixes = strvec_create (3); |
f73dda09 JA |
737 | bash_tilde_prefixes[0] = "=~"; |
738 | bash_tilde_prefixes[1] = ":~"; | |
739 | bash_tilde_prefixes[2] = (char *)NULL; | |
740 | ||
741 | tilde_additional_prefixes = bash_tilde_prefixes; | |
742 | ||
7117c2d2 | 743 | bash_tilde_suffixes = strvec_create (3); |
f73dda09 JA |
744 | bash_tilde_suffixes[0] = ":"; |
745 | bash_tilde_suffixes[1] = "=~"; /* XXX - ?? */ | |
746 | bash_tilde_suffixes[2] = (char *)NULL; | |
747 | ||
748 | tilde_additional_suffixes = bash_tilde_suffixes; | |
726f6388 | 749 | } |
726f6388 JA |
750 | } |
751 | ||
f73dda09 JA |
752 | /* POSIX.2, 3.6.1: A tilde-prefix consists of an unquoted tilde character |
753 | at the beginning of the word, followed by all of the characters preceding | |
754 | the first unquoted slash in the word, or all the characters in the word | |
755 | if there is no slash...If none of the characters in the tilde-prefix are | |
756 | quoted, the characters in the tilde-prefix following the tilde shell be | |
757 | treated as a possible login name. */ | |
758 | ||
759 | #define TILDE_END(c) ((c) == '\0' || (c) == '/' || (c) == ':') | |
760 | ||
761 | static int | |
762 | unquoted_tilde_word (s) | |
763 | const char *s; | |
764 | { | |
765 | const char *r; | |
766 | ||
767 | for (r = s; TILDE_END(*r) == 0; r++) | |
768 | { | |
769 | switch (*r) | |
770 | { | |
771 | case '\\': | |
772 | case '\'': | |
773 | case '"': | |
774 | return 0; | |
775 | } | |
776 | } | |
777 | return 1; | |
778 | } | |
779 | ||
7117c2d2 JA |
780 | /* Tilde-expand S by running it through the tilde expansion library. |
781 | ASSIGN_P is 1 if this is a variable assignment, so the alternate | |
782 | tilde prefixes should be enabled (`=~' and `:~', see above). */ | |
ccc6cda3 | 783 | char * |
7117c2d2 | 784 | bash_tilde_expand (s, assign_p) |
f73dda09 | 785 | const char *s; |
7117c2d2 | 786 | int assign_p; |
726f6388 | 787 | { |
f73dda09 | 788 | int old_immed, r; |
ccc6cda3 | 789 | char *ret; |
726f6388 | 790 | |
ccc6cda3 JA |
791 | old_immed = interrupt_immediately; |
792 | interrupt_immediately = 1; | |
7117c2d2 | 793 | tilde_additional_prefixes = assign_p ? bash_tilde_prefixes : (char **)0; |
f73dda09 JA |
794 | r = (*s == '~') ? unquoted_tilde_word (s) : 1; |
795 | ret = r ? tilde_expand (s) : savestring (s); | |
ccc6cda3 JA |
796 | interrupt_immediately = old_immed; |
797 | return (ret); | |
726f6388 | 798 | } |
d166f048 JA |
799 | |
800 | /* **************************************************************** */ | |
801 | /* */ | |
802 | /* Functions to manipulate and search the group list */ | |
803 | /* */ | |
804 | /* **************************************************************** */ | |
805 | ||
806 | static int ngroups, maxgroups; | |
807 | ||
808 | /* The set of groups that this user is a member of. */ | |
809 | static GETGROUPS_T *group_array = (GETGROUPS_T *)NULL; | |
810 | ||
811 | #if !defined (NOGROUP) | |
812 | # define NOGROUP (gid_t) -1 | |
813 | #endif | |
814 | ||
d166f048 JA |
815 | static void |
816 | initialize_group_array () | |
817 | { | |
818 | register int i; | |
819 | ||
820 | if (maxgroups == 0) | |
821 | maxgroups = getmaxgroups (); | |
822 | ||
823 | ngroups = 0; | |
824 | group_array = (GETGROUPS_T *)xrealloc (group_array, maxgroups * sizeof (GETGROUPS_T)); | |
825 | ||
826 | #if defined (HAVE_GETGROUPS) | |
827 | ngroups = getgroups (maxgroups, group_array); | |
828 | #endif | |
829 | ||
830 | /* If getgroups returns nothing, or the OS does not support getgroups(), | |
831 | make sure the groups array includes at least the current gid. */ | |
832 | if (ngroups == 0) | |
833 | { | |
834 | group_array[0] = current_user.gid; | |
835 | ngroups = 1; | |
836 | } | |
837 | ||
838 | /* If the primary group is not in the groups array, add it as group_array[0] | |
839 | and shuffle everything else up 1, if there's room. */ | |
840 | for (i = 0; i < ngroups; i++) | |
841 | if (current_user.gid == (gid_t)group_array[i]) | |
842 | break; | |
843 | if (i == ngroups && ngroups < maxgroups) | |
844 | { | |
845 | for (i = ngroups; i > 0; i--) | |
28ef6c31 | 846 | group_array[i] = group_array[i - 1]; |
d166f048 JA |
847 | group_array[0] = current_user.gid; |
848 | ngroups++; | |
849 | } | |
cce855bc JA |
850 | |
851 | /* If the primary group is not group_array[0], swap group_array[0] and | |
852 | whatever the current group is. The vast majority of systems should | |
853 | not need this; a notable exception is Linux. */ | |
854 | if (group_array[0] != current_user.gid) | |
855 | { | |
856 | for (i = 0; i < ngroups; i++) | |
28ef6c31 JA |
857 | if (group_array[i] == current_user.gid) |
858 | break; | |
cce855bc JA |
859 | if (i < ngroups) |
860 | { | |
861 | group_array[i] = group_array[0]; | |
862 | group_array[0] = current_user.gid; | |
863 | } | |
864 | } | |
d166f048 JA |
865 | } |
866 | ||
867 | /* Return non-zero if GID is one that we have in our groups list. */ | |
868 | int | |
cce855bc JA |
869 | #if defined (__STDC__) || defined ( _MINIX) |
870 | group_member (gid_t gid) | |
871 | #else | |
d166f048 JA |
872 | group_member (gid) |
873 | gid_t gid; | |
cce855bc | 874 | #endif /* !__STDC__ && !_MINIX */ |
d166f048 JA |
875 | { |
876 | #if defined (HAVE_GETGROUPS) | |
877 | register int i; | |
878 | #endif | |
879 | ||
880 | /* Short-circuit if possible, maybe saving a call to getgroups(). */ | |
881 | if (gid == current_user.gid || gid == current_user.egid) | |
882 | return (1); | |
883 | ||
884 | #if defined (HAVE_GETGROUPS) | |
885 | if (ngroups == 0) | |
886 | initialize_group_array (); | |
887 | ||
888 | /* In case of error, the user loses. */ | |
889 | if (ngroups <= 0) | |
890 | return (0); | |
891 | ||
892 | /* Search through the list looking for GID. */ | |
893 | for (i = 0; i < ngroups; i++) | |
894 | if (gid == (gid_t)group_array[i]) | |
895 | return (1); | |
896 | #endif | |
897 | ||
898 | return (0); | |
899 | } | |
900 | ||
901 | char ** | |
902 | get_group_list (ngp) | |
903 | int *ngp; | |
904 | { | |
905 | static char **group_vector = (char **)NULL; | |
906 | register int i; | |
d166f048 JA |
907 | |
908 | if (group_vector) | |
909 | { | |
910 | if (ngp) | |
911 | *ngp = ngroups; | |
912 | return group_vector; | |
913 | } | |
914 | ||
915 | if (ngroups == 0) | |
916 | initialize_group_array (); | |
917 | ||
918 | if (ngroups <= 0) | |
919 | { | |
920 | if (ngp) | |
921 | *ngp = 0; | |
922 | return (char **)NULL; | |
923 | } | |
924 | ||
7117c2d2 | 925 | group_vector = strvec_create (ngroups); |
d166f048 | 926 | for (i = 0; i < ngroups; i++) |
7117c2d2 | 927 | group_vector[i] = itos (group_array[i]); |
b72432fd | 928 | |
d166f048 JA |
929 | if (ngp) |
930 | *ngp = ngroups; | |
931 | return group_vector; | |
932 | } | |
b72432fd JA |
933 | |
934 | int * | |
935 | get_group_array (ngp) | |
936 | int *ngp; | |
937 | { | |
938 | int i; | |
939 | static int *group_iarray = (int *)NULL; | |
940 | ||
941 | if (group_iarray) | |
942 | { | |
943 | if (ngp) | |
944 | *ngp = ngroups; | |
945 | return (group_iarray); | |
946 | } | |
947 | ||
948 | if (ngroups == 0) | |
949 | initialize_group_array (); | |
950 | ||
951 | if (ngroups <= 0) | |
952 | { | |
953 | if (ngp) | |
954 | *ngp = 0; | |
955 | return (int *)NULL; | |
956 | } | |
957 | ||
958 | group_iarray = (int *)xmalloc (ngroups * sizeof (int)); | |
959 | for (i = 0; i < ngroups; i++) | |
960 | group_iarray[i] = (int)group_array[i]; | |
961 | ||
962 | if (ngp) | |
963 | *ngp = ngroups; | |
964 | return group_iarray; | |
965 | } |