Commit | Line | Data |
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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1980, 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
33 | * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE | |
34 | * -------------------- ----- ---------------------- | |
35 | * CURRENT PATCH LEVEL: 1 00013 | |
36 | * -------------------- ----- ---------------------- | |
37 | * | |
38 | * 19 Aug 92 Kevin Lahey Fixed csh segmentation violation | |
39 | */ | |
40 | ||
41 | #ifndef lint | |
42 | static char sccsid[] = "@(#)dir.c 5.12 (Berkeley) 6/27/91"; | |
43 | #endif /* not lint */ | |
44 | ||
45 | #include <sys/param.h> | |
46 | #include <sys/stat.h> | |
47 | #include <errno.h> | |
48 | #include <stdlib.h> | |
49 | #include <string.h> | |
50 | #include <unistd.h> | |
51 | #if __STDC__ | |
52 | # include <stdarg.h> | |
53 | #else | |
54 | # include <varargs.h> | |
55 | #endif | |
56 | ||
57 | #include "csh.h" | |
58 | #include "dir.h" | |
59 | #include "extern.h" | |
60 | ||
61 | /* Directory management. */ | |
62 | ||
63 | static struct directory | |
64 | *dfind __P((Char *)); | |
65 | static Char *dfollow __P((Char *)); | |
66 | static void printdirs __P((void)); | |
67 | static Char *dgoto __P((Char *)); | |
68 | static void dnewcwd __P((struct directory *)); | |
69 | static void dset __P((Char *)); | |
70 | ||
71 | struct directory dhead; /* "head" of loop */ | |
72 | int printd; /* force name to be printed */ | |
73 | ||
74 | static int dirflag = 0; | |
75 | ||
76 | /* | |
77 | * dinit - initialize current working directory | |
78 | */ | |
79 | void | |
80 | dinit(hp) | |
81 | Char *hp; | |
82 | { | |
83 | register char *tcp; | |
84 | register Char *cp; | |
85 | register struct directory *dp; | |
86 | char path[MAXPATHLEN]; | |
87 | static char *emsg = "csh: Trying to start from \"%s\"\n"; | |
88 | ||
89 | /* Don't believe the login shell home, because it may be a symlink */ | |
90 | tcp = getwd(path); /* see ngetwd.c for System V version */ | |
91 | if (tcp == NULL || *tcp == '\0') { | |
92 | (void) xprintf("csh: %s\n", path); | |
93 | if (hp && *hp) { | |
94 | tcp = short2str(hp); | |
95 | (void) xprintf(emsg, tcp); | |
96 | if (chdir(tcp) == -1) | |
97 | cp = NULL; | |
98 | else | |
99 | cp = hp; | |
100 | } | |
101 | else | |
102 | cp = NULL; | |
103 | if (cp == NULL) { | |
104 | (void) xprintf(emsg, "/"); | |
105 | if (chdir("/") == -1) | |
106 | /* I am not even try to print an error message! */ | |
107 | xexit(1); | |
108 | cp = SAVE("/"); | |
109 | } | |
110 | } | |
111 | else { | |
112 | struct stat swd, shp; | |
113 | ||
114 | /* | |
115 | * See if $HOME is the working directory we got and use that | |
116 | */ | |
117 | if (hp && *hp && | |
118 | stat(tcp, &swd) != -1 && stat(short2str(hp), &shp) != -1 && | |
119 | swd.st_dev == shp.st_dev && swd.st_ino == shp.st_ino) | |
120 | cp = hp; | |
121 | else { | |
122 | char *cwd; | |
123 | ||
124 | /* | |
125 | * use PWD if we have it (for subshells) | |
126 | */ | |
127 | if (cwd = getenv("PWD")) { | |
128 | if (stat(cwd, &shp) != -1 && swd.st_dev == shp.st_dev && | |
129 | swd.st_ino == shp.st_ino) | |
130 | tcp = cwd; | |
131 | } | |
132 | cp = dcanon(str2short(tcp), STRNULL); | |
133 | } | |
134 | } | |
135 | ||
136 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
137 | dp->di_name = Strsave(cp); | |
138 | dp->di_count = 0; | |
139 | dhead.di_next = dhead.di_prev = dp; | |
140 | dp->di_next = dp->di_prev = &dhead; | |
141 | printd = 0; | |
142 | dnewcwd(dp); | |
143 | } | |
144 | ||
145 | static void | |
146 | dset(dp) | |
147 | Char *dp; | |
148 | { | |
149 | /* | |
150 | * Don't call set() directly cause if the directory contains ` or | |
151 | * other junk characters glob will fail. | |
152 | */ | |
153 | register Char **vec = (Char **) xmalloc((size_t) (2 * sizeof(Char **))); | |
154 | ||
155 | vec[0] = Strsave(dp); | |
156 | vec[1] = 0; | |
157 | setq(STRcwd, vec, &shvhed); | |
158 | Setenv(STRPWD, dp); | |
159 | } | |
160 | ||
161 | #define DIR_LONG 1 | |
162 | #define DIR_VERT 2 | |
163 | #define DIR_LINE 4 | |
164 | ||
165 | static void | |
166 | skipargs(v, str) | |
167 | Char ***v; | |
168 | char *str; | |
169 | { | |
170 | Char **n = *v, *s; | |
171 | ||
172 | dirflag = 0; | |
173 | for (n++; *n != NULL && (*n)[0] == '-'; n++) | |
174 | for (s = &((*n)[1]); *s; s++) | |
175 | switch (*s) { | |
176 | case 'l': | |
177 | dirflag |= DIR_LONG; | |
178 | break; | |
179 | case 'v': | |
180 | dirflag |= DIR_VERT; | |
181 | break; | |
182 | case 'n': | |
183 | dirflag |= DIR_LINE; | |
184 | break; | |
185 | default: | |
186 | stderror(ERR_DIRUS, short2str(**v), str); | |
187 | break; | |
188 | } | |
189 | *v = n; | |
190 | } | |
191 | ||
192 | /* | |
193 | * dodirs - list all directories in directory loop | |
194 | */ | |
195 | void | |
196 | dodirs(v) | |
197 | Char **v; | |
198 | { | |
199 | skipargs(&v, ""); | |
200 | ||
201 | if (*v != NULL) | |
202 | stderror(ERR_DIRUS, "dirs", ""); | |
203 | printdirs(); | |
204 | } | |
205 | ||
206 | static void | |
207 | printdirs() | |
208 | { | |
209 | register struct directory *dp; | |
210 | Char *s, *hp = value(STRhome); | |
211 | int idx, len, cur; | |
212 | ||
213 | if (*hp == '\0') | |
214 | hp = NULL; | |
215 | dp = dcwd; | |
216 | idx = 0; | |
217 | cur = 0; | |
218 | do { | |
219 | if (dp == &dhead) | |
220 | continue; | |
221 | if (dirflag & DIR_VERT) { | |
222 | xprintf("%d\t", idx++); | |
223 | cur = 0; | |
224 | } | |
225 | if (!(dirflag & DIR_LONG) && hp != NULL && !eq(hp, STRslash) && | |
226 | prefix(hp, dp->di_name)) | |
227 | len = Strlen(s = (dp->di_name + Strlen(hp))) + 2; | |
228 | else | |
229 | len = Strlen(s = dp->di_name) + 1; | |
230 | ||
231 | cur += len; | |
232 | if ((dirflag & DIR_LINE) && cur >= 80 - 1 && len < 80) { | |
233 | xprintf("\n"); | |
234 | cur = len; | |
235 | } | |
236 | xprintf(s != dp->di_name ? "~%s%c" : "%s%c", | |
237 | short2str(s), (dirflag & DIR_VERT) ? '\n' : ' '); | |
238 | } while ((dp = dp->di_prev) != dcwd); | |
239 | if (!(dirflag & DIR_VERT)) | |
240 | xprintf("\n"); | |
241 | } | |
242 | ||
243 | void | |
244 | dtildepr(home, dir) | |
245 | register Char *home, *dir; | |
246 | { | |
247 | ||
248 | if (!eq(home, STRslash) && prefix(home, dir)) | |
249 | xprintf("~%s", short2str(dir + Strlen(home))); | |
250 | else | |
251 | xprintf("%s", short2str(dir)); | |
252 | } | |
253 | ||
254 | void | |
255 | dtilde() | |
256 | { | |
257 | struct directory *d = dcwd; | |
258 | ||
259 | do { | |
260 | if (d == &dhead) | |
261 | continue; | |
262 | d->di_name = dcanon(d->di_name, STRNULL); | |
263 | } while ((d = d->di_prev) != dcwd); | |
264 | ||
265 | dset(dcwd->di_name); | |
266 | } | |
267 | ||
268 | ||
269 | /* dnormalize(): | |
270 | * If the name starts with . or .. then we might need to normalize | |
271 | * it depending on the symbolic link flags | |
272 | */ | |
273 | Char * | |
274 | dnormalize(cp) | |
275 | Char *cp; | |
276 | { | |
277 | ||
278 | #define UC (unsigned char) | |
279 | #define ISDOT(c) (UC(c)[0] == '.' && ((UC(c)[1] == '\0') || (UC(c)[1] == '/'))) | |
280 | #define ISDOTDOT(c) (UC(c)[0] == '.' && ISDOT(&((c)[1]))) | |
281 | ||
282 | if ((unsigned char) cp[0] == '/') | |
283 | return (Strsave(cp)); | |
284 | ||
285 | if (adrof(STRignore_symlinks)) { | |
286 | int dotdot = 0; | |
287 | Char *dp, *cwd; | |
288 | ||
289 | cwd = (Char *) xmalloc((size_t) ((Strlen(dcwd->di_name) + 3) * | |
290 | sizeof(Char))); | |
291 | (void) Strcpy(cwd, dcwd->di_name); | |
292 | ||
293 | /* | |
294 | * Ignore . and count ..'s | |
295 | */ | |
296 | while (*cp) { | |
297 | if (ISDOT(cp)) { | |
298 | if (*++cp) | |
299 | cp++; | |
300 | } | |
301 | else if (ISDOTDOT(cp)) { | |
302 | dotdot++; | |
303 | cp += 2; | |
304 | if (*cp) | |
305 | cp++; | |
306 | } | |
307 | else | |
308 | break; | |
309 | } | |
310 | while (dotdot > 0) | |
311 | if ((dp = Strrchr(cwd, '/'))) { | |
312 | *dp = '\0'; | |
313 | dotdot--; | |
314 | } | |
315 | else | |
316 | break; | |
317 | ||
318 | if (*cp) { | |
319 | cwd[dotdot = Strlen(cwd)] = '/'; | |
320 | cwd[dotdot + 1] = '\0'; | |
321 | dp = Strspl(cwd, cp); | |
322 | xfree((ptr_t) cwd); | |
323 | return dp; | |
324 | } | |
325 | else { | |
326 | if (!*cwd) { | |
327 | cwd[0] = '/'; | |
328 | cwd[1] = '\0'; | |
329 | } | |
330 | return cwd; | |
331 | } | |
332 | } | |
333 | return Strsave(cp); | |
334 | } | |
335 | ||
336 | /* | |
337 | * dochngd - implement chdir command. | |
338 | */ | |
339 | void | |
340 | dochngd(v) | |
341 | Char **v; | |
342 | { | |
343 | register Char *cp; | |
344 | register struct directory *dp; | |
345 | ||
346 | skipargs(&v, " [<dir>]"); | |
347 | printd = 0; | |
348 | if (*v == NULL) { | |
349 | if ((cp = value(STRhome)) == NULL || *cp == 0) | |
350 | stderror(ERR_NAME | ERR_NOHOMEDIR); | |
351 | if (chdir(short2str(cp)) < 0) | |
352 | stderror(ERR_NAME | ERR_CANTCHANGE); | |
353 | cp = Strsave(cp); | |
354 | } | |
355 | else if (v[1] != NULL) { | |
356 | stderror(ERR_NAME | ERR_TOOMANY); | |
357 | /* NOTREACHED */ | |
358 | return; | |
359 | } | |
360 | else if ((dp = dfind(*v)) != 0) { | |
361 | char *tmp; | |
362 | ||
363 | printd = 1; | |
364 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
365 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
366 | dcwd->di_prev->di_next = dcwd->di_next; | |
367 | dcwd->di_next->di_prev = dcwd->di_prev; | |
368 | dfree(dcwd); | |
369 | dnewcwd(dp); | |
370 | return; | |
371 | } | |
372 | else | |
373 | cp = dfollow(*v); | |
374 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
375 | dp->di_name = cp; | |
376 | dp->di_count = 0; | |
377 | dp->di_next = dcwd->di_next; | |
378 | dp->di_prev = dcwd->di_prev; | |
379 | dp->di_prev->di_next = dp; | |
380 | dp->di_next->di_prev = dp; | |
381 | dfree(dcwd); | |
382 | dnewcwd(dp); | |
383 | } | |
384 | ||
385 | static Char * | |
386 | dgoto(cp) | |
387 | Char *cp; | |
388 | { | |
389 | Char *dp; | |
390 | ||
391 | if (*cp != '/') { | |
392 | register Char *p, *q; | |
393 | int cwdlen; | |
394 | ||
395 | for (p = dcwd->di_name; *p++;); | |
396 | if ((cwdlen = p - dcwd->di_name - 1) == 1) /* root */ | |
397 | cwdlen = 0; | |
398 | for (p = cp; *p++;); | |
399 | dp = (Char *) xmalloc((size_t)((cwdlen + (p - cp) + 1) * sizeof(Char))); | |
400 | for (p = dp, q = dcwd->di_name; *p++ = *q++;); | |
401 | if (cwdlen) | |
402 | p[-1] = '/'; | |
403 | else | |
404 | p--; /* don't add a / after root */ | |
405 | for (q = cp; *p++ = *q++;); | |
406 | xfree((ptr_t) cp); | |
407 | cp = dp; | |
408 | dp += cwdlen; | |
409 | } | |
410 | else | |
411 | dp = cp; | |
412 | ||
413 | cp = dcanon(cp, dp); | |
414 | return cp; | |
415 | } | |
416 | ||
417 | /* | |
418 | * dfollow - change to arg directory; fall back on cdpath if not valid | |
419 | */ | |
420 | static Char * | |
421 | dfollow(cp) | |
422 | register Char *cp; | |
423 | { | |
424 | register Char *dp; | |
425 | struct varent *c; | |
426 | char ebuf[MAXPATHLEN]; | |
427 | int serrno; | |
428 | ||
429 | cp = globone(cp, G_ERROR); | |
430 | /* | |
431 | * if we are ignoring symlinks, try to fix relatives now. | |
432 | */ | |
433 | dp = dnormalize(cp); | |
434 | if (chdir(short2str(dp)) >= 0) { | |
435 | xfree((ptr_t) cp); | |
436 | return dgoto(dp); | |
437 | } | |
438 | else { | |
439 | xfree((ptr_t) dp); | |
440 | if (chdir(short2str(cp)) >= 0) | |
441 | return dgoto(cp); | |
442 | serrno = errno; | |
443 | } | |
444 | ||
445 | if (cp[0] != '/' && !prefix(STRdotsl, cp) && !prefix(STRdotdotsl, cp) | |
446 | && (c = adrof(STRcdpath))) { | |
447 | Char **cdp; | |
448 | register Char *p; | |
449 | Char buf[MAXPATHLEN]; | |
450 | ||
451 | for (cdp = c->vec; *cdp; cdp++) { | |
452 | for (dp = buf, p = *cdp; *dp++ = *p++;); | |
453 | dp[-1] = '/'; | |
454 | for (p = cp; *dp++ = *p++;); | |
455 | if (chdir(short2str(buf)) >= 0) { | |
456 | printd = 1; | |
457 | xfree((ptr_t) cp); | |
458 | cp = Strsave(buf); | |
459 | return dgoto(cp); | |
460 | } | |
461 | } | |
462 | } | |
463 | dp = value(cp); | |
464 | if ((dp[0] == '/' || dp[0] == '.') && chdir(short2str(dp)) >= 0) { | |
465 | xfree((ptr_t) cp); | |
466 | cp = Strsave(dp); | |
467 | printd = 1; | |
468 | return dgoto(cp); | |
469 | } | |
470 | (void) strcpy(ebuf, short2str(cp)); | |
471 | xfree((ptr_t) cp); | |
472 | stderror(ERR_SYSTEM, ebuf, strerror(serrno)); | |
473 | return (NULL); | |
474 | } | |
475 | ||
476 | ||
477 | /* | |
478 | * dopushd - push new directory onto directory stack. | |
479 | * with no arguments exchange top and second. | |
480 | * with numeric argument (+n) bring it to top. | |
481 | */ | |
482 | void | |
483 | dopushd(v) | |
484 | Char **v; | |
485 | { | |
486 | register struct directory *dp; | |
487 | ||
488 | skipargs(&v, " [<dir>|+<n>]"); | |
489 | printd = 1; | |
490 | if (*v == NULL) { | |
491 | char *tmp; | |
492 | ||
493 | if ((dp = dcwd->di_prev) == &dhead) | |
494 | dp = dhead.di_prev; | |
495 | if (dp == dcwd) | |
496 | stderror(ERR_NAME | ERR_NODIR); | |
497 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
498 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
499 | dp->di_prev->di_next = dp->di_next; | |
500 | dp->di_next->di_prev = dp->di_prev; | |
501 | dp->di_next = dcwd->di_next; | |
502 | dp->di_prev = dcwd; | |
503 | dcwd->di_next->di_prev = dp; | |
504 | dcwd->di_next = dp; | |
505 | } | |
506 | else if (v[1] != NULL) { | |
507 | stderror(ERR_NAME | ERR_TOOMANY); | |
508 | /* NOTREACHED */ | |
509 | return; | |
510 | } | |
511 | else if (dp = dfind(*v)) { | |
512 | char *tmp; | |
513 | ||
514 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
515 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
516 | } | |
517 | else { | |
518 | register Char *ccp; | |
519 | ||
520 | ccp = dfollow(*v); | |
521 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
522 | dp->di_name = ccp; | |
523 | dp->di_count = 0; | |
524 | dp->di_prev = dcwd; | |
525 | dp->di_next = dcwd->di_next; | |
526 | dcwd->di_next = dp; | |
527 | dp->di_next->di_prev = dp; | |
528 | } | |
529 | dnewcwd(dp); | |
530 | } | |
531 | ||
532 | /* | |
533 | * dfind - find a directory if specified by numeric (+n) argument | |
534 | */ | |
535 | static struct directory * | |
536 | dfind(cp) | |
537 | register Char *cp; | |
538 | { | |
539 | register struct directory *dp; | |
540 | register int i; | |
541 | register Char *ep; | |
542 | ||
543 | if (*cp++ != '+') | |
544 | return (0); | |
545 | for (ep = cp; Isdigit(*ep); ep++) | |
546 | continue; | |
547 | if (*ep) | |
548 | return (0); | |
549 | i = getn(cp); | |
550 | if (i <= 0) | |
551 | return (0); | |
552 | for (dp = dcwd; i != 0; i--) { | |
553 | if ((dp = dp->di_prev) == &dhead) | |
554 | dp = dp->di_prev; | |
555 | if (dp == dcwd) | |
556 | stderror(ERR_NAME | ERR_DEEP); | |
557 | } | |
558 | return (dp); | |
559 | } | |
560 | ||
561 | /* | |
562 | * dopopd - pop a directory out of the directory stack | |
563 | * with a numeric argument just discard it. | |
564 | */ | |
565 | void | |
566 | dopopd(v) | |
567 | Char **v; | |
568 | { | |
569 | register struct directory *dp, *p = NULL; | |
570 | ||
571 | skipargs(&v, " [+<n>]"); | |
572 | printd = 1; | |
573 | if (*v == NULL) | |
574 | dp = dcwd; | |
575 | else if (v[1] != NULL) { | |
576 | stderror(ERR_NAME | ERR_TOOMANY); | |
577 | /* NOTREACHED */ | |
578 | return; | |
579 | } | |
580 | else if ((dp = dfind(*v)) == 0) | |
581 | stderror(ERR_NAME | ERR_BADDIR); | |
582 | if (dp->di_prev == &dhead && dp->di_next == &dhead) | |
583 | stderror(ERR_NAME | ERR_EMPTY); | |
584 | if (dp == dcwd) { | |
585 | char *tmp; | |
586 | ||
587 | if ((p = dp->di_prev) == &dhead) | |
588 | p = dhead.di_prev; | |
589 | if (chdir(tmp = short2str(p->di_name)) < 0) | |
590 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
591 | } | |
592 | dp->di_prev->di_next = dp->di_next; | |
593 | dp->di_next->di_prev = dp->di_prev; | |
594 | if (dp == dcwd) | |
595 | dnewcwd(p); | |
596 | else { | |
597 | printdirs(); | |
598 | } | |
599 | dfree(dp); | |
600 | } | |
601 | ||
602 | /* | |
603 | * dfree - free the directory (or keep it if it still has ref count) | |
604 | */ | |
605 | void | |
606 | dfree(dp) | |
607 | register struct directory *dp; | |
608 | { | |
609 | ||
610 | if (dp->di_count != 0) { | |
611 | dp->di_next = dp->di_prev = 0; | |
612 | } | |
613 | else { | |
614 | xfree((char *) dp->di_name); | |
615 | xfree((ptr_t) dp); | |
616 | } | |
617 | } | |
618 | ||
619 | /* | |
620 | * dcanon - canonicalize the pathname, removing excess ./ and ../ etc. | |
621 | * we are of course assuming that the file system is standardly | |
622 | * constructed (always have ..'s, directories have links) | |
623 | */ | |
624 | Char * | |
625 | dcanon(cp, p) | |
626 | register Char *cp, *p; | |
627 | { | |
628 | register Char *sp; | |
629 | register Char *p1, *p2; /* general purpose */ | |
630 | bool slash; | |
631 | ||
632 | Char link[MAXPATHLEN]; | |
633 | char tlink[MAXPATHLEN]; | |
634 | int cc; | |
635 | Char *newcp; | |
636 | ||
637 | /* | |
638 | * christos: if the path given does not start with a slash prepend cwd. If | |
639 | * cwd does not start with a path or the result would be too long abort(). | |
640 | */ | |
641 | if (*cp != '/') { | |
642 | Char tmpdir[MAXPATHLEN]; | |
643 | ||
644 | p1 = value(STRcwd); | |
645 | if (p1 == NULL || *p1 != '/') | |
646 | abort(); | |
647 | if (Strlen(p1) + Strlen(cp) + 1 >= MAXPATHLEN) | |
648 | abort(); | |
649 | (void) Strcpy(tmpdir, p1); | |
650 | (void) Strcat(tmpdir, STRslash); | |
651 | (void) Strcat(tmpdir, cp); | |
652 | xfree((ptr_t) cp); | |
653 | cp = p = Strsave(tmpdir); | |
654 | } | |
655 | ||
656 | while (*p) { /* for each component */ | |
657 | sp = p; /* save slash address */ | |
658 | while (*++p == '/') /* flush extra slashes */ | |
659 | ; | |
660 | if (p != ++sp) | |
661 | for (p1 = sp, p2 = p; *p1++ = *p2++;); | |
662 | p = sp; /* save start of component */ | |
663 | slash = 0; | |
664 | while (*++p) /* find next slash or end of path */ | |
665 | if (*p == '/') { | |
666 | slash = 1; | |
667 | *p = 0; | |
668 | break; | |
669 | } | |
670 | ||
671 | if (*sp == '\0') /* if component is null */ | |
672 | if (--sp == cp) /* if path is one char (i.e. /) */ | |
673 | break; | |
674 | else | |
675 | *sp = '\0'; | |
676 | else if (sp[0] == '.' && sp[1] == 0) { | |
677 | if (slash) { | |
678 | for (p1 = sp, p2 = p + 1; *p1++ = *p2++;); | |
679 | p = --sp; | |
680 | } | |
681 | else if (--sp != cp) | |
682 | *sp = '\0'; | |
683 | } | |
684 | else if (sp[0] == '.' && sp[1] == '.' && sp[2] == 0) { | |
685 | /* | |
686 | * We have something like "yyy/xxx/..", where "yyy" can be null or | |
687 | * a path starting at /, and "xxx" is a single component. Before | |
688 | * compressing "xxx/..", we want to expand "yyy/xxx", if it is a | |
689 | * symbolic link. | |
690 | */ | |
691 | *--sp = 0; /* form the pathname for readlink */ | |
692 | if (sp != cp && !adrof(STRignore_symlinks) && | |
693 | (cc = readlink(short2str(cp), tlink, | |
694 | sizeof tlink)) >= 0) { | |
695 | (void) Strcpy(link, str2short(tlink)); | |
696 | link[cc] = '\0'; | |
697 | ||
698 | if (slash) | |
699 | *p = '/'; | |
700 | /* | |
701 | * Point p to the '/' in "/..", and restore the '/'. | |
702 | */ | |
703 | *(p = sp) = '/'; | |
704 | /* | |
705 | * find length of p | |
706 | */ | |
707 | for (p1 = p; *p1++;); | |
708 | if (*link != '/') { | |
709 | /* | |
710 | * Relative path, expand it between the "yyy/" and the | |
711 | * "/..". First, back sp up to the character past "yyy/". | |
712 | */ | |
713 | while (*--sp != '/'); | |
714 | sp++; | |
715 | *sp = 0; | |
716 | /* | |
717 | * New length is "yyy/" + link + "/.." and rest | |
718 | */ | |
719 | p1 = newcp = (Char *) xmalloc((size_t) | |
720 | (((sp - cp) + cc + (p1 - p)) * | |
721 | sizeof(Char))); | |
722 | /* | |
723 | * Copy new path into newcp | |
724 | */ | |
725 | for (p2 = cp; *p1++ = *p2++;); | |
726 | for (p1--, p2 = link; *p1++ = *p2++;); | |
727 | for (p1--, p2 = p; *p1++ = *p2++;); | |
728 | /* | |
729 | * Restart canonicalization at expanded "/xxx". | |
730 | */ | |
731 | p = sp - cp - 1 + newcp; | |
732 | } | |
733 | else { | |
734 | /* | |
735 | * New length is link + "/.." and rest | |
736 | */ | |
737 | p1 = newcp = (Char *) xmalloc((size_t) | |
738 | ((cc + (p1 - p)) * sizeof(Char))); | |
739 | /* | |
740 | * Copy new path into newcp | |
741 | */ | |
742 | for (p2 = link; *p1++ = *p2++;); | |
743 | for (p1--, p2 = p; *p1++ = *p2++;); | |
744 | /* | |
745 | * Restart canonicalization at beginning | |
746 | */ | |
747 | p = newcp; | |
748 | } | |
749 | xfree((ptr_t) cp); | |
750 | cp = newcp; | |
751 | continue; /* canonicalize the link */ | |
752 | } | |
753 | *sp = '/'; | |
754 | if (sp != cp) | |
755 | while (*--sp != '/'); | |
756 | if (slash) { | |
757 | for (p1 = sp + 1, p2 = p + 1; *p1++ = *p2++;); | |
758 | p = sp; | |
759 | } | |
760 | else if (cp == sp) | |
761 | *++sp = '\0'; | |
762 | else | |
763 | *sp = '\0'; | |
764 | } | |
765 | else { /* normal dir name (not . or .. or nothing) */ | |
766 | ||
767 | if (sp != cp && adrof(STRchase_symlinks) && | |
768 | !adrof(STRignore_symlinks) && | |
769 | (cc = readlink(short2str(cp), tlink, | |
770 | sizeof tlink)) >= 0) { | |
771 | (void) Strcpy(link, str2short(tlink)); | |
772 | link[cc] = '\0'; | |
773 | ||
774 | /* | |
775 | * restore the '/'. | |
776 | */ | |
777 | if (slash) | |
778 | *p = '/'; | |
779 | ||
780 | /* | |
781 | * point sp to p (rather than backing up). | |
782 | */ | |
783 | sp = p; | |
784 | ||
785 | /* | |
786 | * find length of p | |
787 | */ | |
788 | for (p1 = p; *p1++;); | |
789 | if (*link != '/') { | |
790 | /* | |
791 | * Relative path, expand it between the "yyy/" and the | |
792 | * remainder. First, back sp up to the character past | |
793 | * "yyy/". | |
794 | */ | |
795 | while (*--sp != '/'); | |
796 | sp++; | |
797 | *sp = 0; | |
798 | /* | |
799 | * New length is "yyy/" + link + "/.." and rest | |
800 | */ | |
801 | p1 = newcp = (Char *) xmalloc((size_t) | |
802 | (((sp - cp) + cc + (p1 - p)) | |
803 | * sizeof(Char))); | |
804 | /* | |
805 | * Copy new path into newcp | |
806 | */ | |
807 | for (p2 = cp; *p1++ = *p2++;); | |
808 | for (p1--, p2 = link; *p1++ = *p2++;); | |
809 | for (p1--, p2 = p; *p1++ = *p2++;); | |
810 | /* | |
811 | * Restart canonicalization at expanded "/xxx". | |
812 | */ | |
813 | p = sp - cp - 1 + newcp; | |
814 | } | |
815 | else { | |
816 | /* | |
817 | * New length is link + the rest | |
818 | */ | |
819 | p1 = newcp = (Char *) xmalloc((size_t) | |
820 | ((cc + (p1 - p)) * sizeof(Char))); | |
821 | /* | |
822 | * Copy new path into newcp | |
823 | */ | |
824 | for (p2 = link; *p1++ = *p2++;); | |
825 | for (p1--, p2 = p; *p1++ = *p2++;); | |
826 | /* | |
827 | * Restart canonicalization at beginning | |
828 | */ | |
829 | p = newcp; | |
830 | } | |
831 | xfree((ptr_t) cp); | |
832 | cp = newcp; | |
833 | continue; /* canonicalize the link */ | |
834 | } | |
835 | if (slash) | |
836 | *p = '/'; | |
837 | } | |
838 | } | |
839 | ||
840 | /* | |
841 | * fix home... | |
842 | */ | |
843 | p1 = value(STRhome); | |
844 | cc = Strlen(p1); | |
845 | /* | |
846 | * See if we're not in a subdir of STRhome | |
847 | */ | |
848 | if (p1 && *p1 == '/' && | |
849 | (Strncmp(p1, cp, cc) != 0 || (cp[cc] != '/' && cp[cc] != '\0'))) { | |
850 | static ino_t home_ino = -1; | |
851 | static dev_t home_dev = -1; | |
852 | static Char *home_ptr = NULL; | |
853 | struct stat statbuf; | |
854 | ||
855 | /* | |
856 | * Get dev and ino of STRhome | |
857 | */ | |
858 | if (home_ptr != p1 && | |
859 | stat(short2str(p1), &statbuf) != -1) { | |
860 | home_dev = statbuf.st_dev; | |
861 | home_ino = statbuf.st_ino; | |
862 | home_ptr = p1; | |
863 | } | |
864 | /* | |
865 | * Start comparing dev & ino backwards | |
866 | */ | |
867 | p2 = Strcpy(link, cp); | |
868 | for (sp = NULL; *p2 && stat(short2str(p2), &statbuf) != -1;) { | |
869 | if (statbuf.st_dev == home_dev && | |
870 | statbuf.st_ino == home_ino) { | |
871 | sp = (Char *) - 1; | |
872 | break; | |
873 | } | |
874 | if (sp = Strrchr(p2, '/')) | |
875 | *sp = '\0'; | |
876 | } | |
877 | /* | |
878 | * See if we found it | |
879 | */ | |
880 | if (*p2 && sp == (Char *) -1) { | |
881 | /* | |
882 | * Use STRhome to make '~' work | |
883 | */ | |
884 | p2 = cp + Strlen(p2); | |
885 | sp = newcp = (Char *) xmalloc((size_t) | |
886 | /* 19 Sep 92*/ ((cc + Strlen(p2) + 1) * sizeof(Char))); | |
887 | while (*p1) | |
888 | *sp++ = *p1++; | |
889 | while (*p2) | |
890 | *sp++ = *p2++; | |
891 | *sp = '\0'; | |
892 | xfree((ptr_t) cp); | |
893 | cp = newcp; | |
894 | } | |
895 | } | |
896 | return cp; | |
897 | } | |
898 | ||
899 | ||
900 | /* | |
901 | * dnewcwd - make a new directory in the loop the current one | |
902 | */ | |
903 | static void | |
904 | dnewcwd(dp) | |
905 | register struct directory *dp; | |
906 | { | |
907 | dcwd = dp; | |
908 | dset(dcwd->di_name); | |
909 | if (printd && !(adrof(STRpushdsilent))) | |
910 | printdirs(); | |
911 | } |