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bca5a2cb WJ |
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 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)dir.c 5.12 (Berkeley) 6/27/91"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | #include <sys/param.h> | |
39 | #include <sys/stat.h> | |
40 | #include <errno.h> | |
41 | #include <stdlib.h> | |
42 | #include <string.h> | |
43 | #include <unistd.h> | |
44 | #if __STDC__ | |
45 | # include <stdarg.h> | |
46 | #else | |
47 | # include <varargs.h> | |
48 | #endif | |
49 | ||
50 | #include "csh.h" | |
51 | #include "dir.h" | |
52 | #include "extern.h" | |
53 | ||
54 | /* Directory management. */ | |
55 | ||
56 | static struct directory | |
57 | *dfind __P((Char *)); | |
58 | static Char *dfollow __P((Char *)); | |
59 | static void printdirs __P((void)); | |
60 | static Char *dgoto __P((Char *)); | |
61 | static void dnewcwd __P((struct directory *)); | |
62 | static void dset __P((Char *)); | |
63 | ||
64 | struct directory dhead; /* "head" of loop */ | |
65 | int printd; /* force name to be printed */ | |
66 | ||
67 | static int dirflag = 0; | |
68 | ||
69 | /* | |
70 | * dinit - initialize current working directory | |
71 | */ | |
72 | void | |
73 | dinit(hp) | |
74 | Char *hp; | |
75 | { | |
76 | register char *tcp; | |
77 | register Char *cp; | |
78 | register struct directory *dp; | |
79 | char path[MAXPATHLEN]; | |
80 | static char *emsg = "csh: Trying to start from \"%s\"\n"; | |
81 | ||
82 | /* Don't believe the login shell home, because it may be a symlink */ | |
83 | tcp = getwd(path); /* see ngetwd.c for System V version */ | |
84 | if (tcp == NULL || *tcp == '\0') { | |
85 | (void) xprintf("csh: %s\n", path); | |
86 | if (hp && *hp) { | |
87 | tcp = short2str(hp); | |
88 | (void) xprintf(emsg, tcp); | |
89 | if (chdir(tcp) == -1) | |
90 | cp = NULL; | |
91 | else | |
92 | cp = hp; | |
93 | } | |
94 | else | |
95 | cp = NULL; | |
96 | if (cp == NULL) { | |
97 | (void) xprintf(emsg, "/"); | |
98 | if (chdir("/") == -1) | |
99 | /* I am not even try to print an error message! */ | |
100 | xexit(1); | |
101 | cp = SAVE("/"); | |
102 | } | |
103 | } | |
104 | else { | |
105 | struct stat swd, shp; | |
106 | ||
107 | /* | |
108 | * See if $HOME is the working directory we got and use that | |
109 | */ | |
110 | if (hp && *hp && | |
111 | stat(tcp, &swd) != -1 && stat(short2str(hp), &shp) != -1 && | |
112 | swd.st_dev == shp.st_dev && swd.st_ino == shp.st_ino) | |
113 | cp = hp; | |
114 | else { | |
115 | char *cwd; | |
116 | ||
117 | /* | |
118 | * use PWD if we have it (for subshells) | |
119 | */ | |
120 | if (cwd = getenv("PWD")) { | |
121 | if (stat(cwd, &shp) != -1 && swd.st_dev == shp.st_dev && | |
122 | swd.st_ino == shp.st_ino) | |
123 | tcp = cwd; | |
124 | } | |
125 | cp = dcanon(str2short(tcp), STRNULL); | |
126 | } | |
127 | } | |
128 | ||
129 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
130 | dp->di_name = Strsave(cp); | |
131 | dp->di_count = 0; | |
132 | dhead.di_next = dhead.di_prev = dp; | |
133 | dp->di_next = dp->di_prev = &dhead; | |
134 | printd = 0; | |
135 | dnewcwd(dp); | |
136 | } | |
137 | ||
138 | static void | |
139 | dset(dp) | |
140 | Char *dp; | |
141 | { | |
142 | /* | |
143 | * Don't call set() directly cause if the directory contains ` or | |
144 | * other junk characters glob will fail. | |
145 | */ | |
146 | register Char **vec = (Char **) xmalloc((size_t) (2 * sizeof(Char **))); | |
147 | ||
148 | vec[0] = Strsave(dp); | |
149 | vec[1] = 0; | |
150 | setq(STRcwd, vec, &shvhed); | |
151 | Setenv(STRPWD, dp); | |
152 | } | |
153 | ||
154 | #define DIR_LONG 1 | |
155 | #define DIR_VERT 2 | |
156 | #define DIR_LINE 4 | |
157 | ||
158 | static void | |
159 | skipargs(v, str) | |
160 | Char ***v; | |
161 | char *str; | |
162 | { | |
163 | Char **n = *v, *s; | |
164 | ||
165 | dirflag = 0; | |
166 | for (n++; *n != NULL && (*n)[0] == '-'; n++) | |
167 | for (s = &((*n)[1]); *s; s++) | |
168 | switch (*s) { | |
169 | case 'l': | |
170 | dirflag |= DIR_LONG; | |
171 | break; | |
172 | case 'v': | |
173 | dirflag |= DIR_VERT; | |
174 | break; | |
175 | case 'n': | |
176 | dirflag |= DIR_LINE; | |
177 | break; | |
178 | default: | |
179 | stderror(ERR_DIRUS, short2str(**v), str); | |
180 | break; | |
181 | } | |
182 | *v = n; | |
183 | } | |
184 | ||
185 | /* | |
186 | * dodirs - list all directories in directory loop | |
187 | */ | |
188 | void | |
189 | dodirs(v) | |
190 | Char **v; | |
191 | { | |
192 | skipargs(&v, ""); | |
193 | ||
194 | if (*v != NULL) | |
195 | stderror(ERR_DIRUS, "dirs", ""); | |
196 | printdirs(); | |
197 | } | |
198 | ||
199 | static void | |
200 | printdirs() | |
201 | { | |
202 | register struct directory *dp; | |
203 | Char *s, *hp = value(STRhome); | |
204 | int idx, len, cur; | |
205 | ||
206 | if (*hp == '\0') | |
207 | hp = NULL; | |
208 | dp = dcwd; | |
209 | idx = 0; | |
210 | cur = 0; | |
211 | do { | |
212 | if (dp == &dhead) | |
213 | continue; | |
214 | if (dirflag & DIR_VERT) { | |
215 | xprintf("%d\t", idx++); | |
216 | cur = 0; | |
217 | } | |
218 | if (!(dirflag & DIR_LONG) && hp != NULL && !eq(hp, STRslash) && | |
219 | prefix(hp, dp->di_name)) | |
220 | len = Strlen(s = (dp->di_name + Strlen(hp))) + 2; | |
221 | else | |
222 | len = Strlen(s = dp->di_name) + 1; | |
223 | ||
224 | cur += len; | |
225 | if ((dirflag & DIR_LINE) && cur >= 80 - 1 && len < 80) { | |
226 | xprintf("\n"); | |
227 | cur = len; | |
228 | } | |
229 | xprintf(s != dp->di_name ? "~%s%c" : "%s%c", | |
230 | short2str(s), (dirflag & DIR_VERT) ? '\n' : ' '); | |
231 | } while ((dp = dp->di_prev) != dcwd); | |
232 | if (!(dirflag & DIR_VERT)) | |
233 | xprintf("\n"); | |
234 | } | |
235 | ||
236 | void | |
237 | dtildepr(home, dir) | |
238 | register Char *home, *dir; | |
239 | { | |
240 | ||
241 | if (!eq(home, STRslash) && prefix(home, dir)) | |
242 | xprintf("~%s", short2str(dir + Strlen(home))); | |
243 | else | |
244 | xprintf("%s", short2str(dir)); | |
245 | } | |
246 | ||
247 | void | |
248 | dtilde() | |
249 | { | |
250 | struct directory *d = dcwd; | |
251 | ||
252 | do { | |
253 | if (d == &dhead) | |
254 | continue; | |
255 | d->di_name = dcanon(d->di_name, STRNULL); | |
256 | } while ((d = d->di_prev) != dcwd); | |
257 | ||
258 | dset(dcwd->di_name); | |
259 | } | |
260 | ||
261 | ||
262 | /* dnormalize(): | |
263 | * If the name starts with . or .. then we might need to normalize | |
264 | * it depending on the symbolic link flags | |
265 | */ | |
266 | Char * | |
267 | dnormalize(cp) | |
268 | Char *cp; | |
269 | { | |
270 | ||
271 | #define UC (unsigned char) | |
272 | #define ISDOT(c) (UC(c)[0] == '.' && ((UC(c)[1] == '\0') || (UC(c)[1] == '/'))) | |
273 | #define ISDOTDOT(c) (UC(c)[0] == '.' && ISDOT(&((c)[1]))) | |
274 | ||
275 | if ((unsigned char) cp[0] == '/') | |
276 | return (Strsave(cp)); | |
277 | ||
278 | if (adrof(STRignore_symlinks)) { | |
279 | int dotdot = 0; | |
280 | Char *dp, *cwd; | |
281 | ||
282 | cwd = (Char *) xmalloc((size_t) ((Strlen(dcwd->di_name) + 3) * | |
283 | sizeof(Char))); | |
284 | (void) Strcpy(cwd, dcwd->di_name); | |
285 | ||
286 | /* | |
287 | * Ignore . and count ..'s | |
288 | */ | |
289 | while (*cp) { | |
290 | if (ISDOT(cp)) { | |
291 | if (*++cp) | |
292 | cp++; | |
293 | } | |
294 | else if (ISDOTDOT(cp)) { | |
295 | dotdot++; | |
296 | cp += 2; | |
297 | if (*cp) | |
298 | cp++; | |
299 | } | |
300 | else | |
301 | break; | |
302 | } | |
303 | while (dotdot > 0) | |
304 | if ((dp = Strrchr(cwd, '/'))) { | |
305 | *dp = '\0'; | |
306 | dotdot--; | |
307 | } | |
308 | else | |
309 | break; | |
310 | ||
311 | if (*cp) { | |
312 | cwd[dotdot = Strlen(cwd)] = '/'; | |
313 | cwd[dotdot + 1] = '\0'; | |
314 | dp = Strspl(cwd, cp); | |
315 | xfree((ptr_t) cwd); | |
316 | return dp; | |
317 | } | |
318 | else { | |
319 | if (!*cwd) { | |
320 | cwd[0] = '/'; | |
321 | cwd[1] = '\0'; | |
322 | } | |
323 | return cwd; | |
324 | } | |
325 | } | |
326 | return Strsave(cp); | |
327 | } | |
328 | ||
329 | /* | |
330 | * dochngd - implement chdir command. | |
331 | */ | |
332 | void | |
333 | dochngd(v) | |
334 | Char **v; | |
335 | { | |
336 | register Char *cp; | |
337 | register struct directory *dp; | |
338 | ||
339 | skipargs(&v, " [<dir>]"); | |
340 | printd = 0; | |
341 | if (*v == NULL) { | |
342 | if ((cp = value(STRhome)) == NULL || *cp == 0) | |
343 | stderror(ERR_NAME | ERR_NOHOMEDIR); | |
344 | if (chdir(short2str(cp)) < 0) | |
345 | stderror(ERR_NAME | ERR_CANTCHANGE); | |
346 | cp = Strsave(cp); | |
347 | } | |
348 | else if (v[1] != NULL) { | |
349 | stderror(ERR_NAME | ERR_TOOMANY); | |
350 | /* NOTREACHED */ | |
351 | return; | |
352 | } | |
353 | else if ((dp = dfind(*v)) != 0) { | |
354 | char *tmp; | |
355 | ||
356 | printd = 1; | |
357 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
358 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
359 | dcwd->di_prev->di_next = dcwd->di_next; | |
360 | dcwd->di_next->di_prev = dcwd->di_prev; | |
361 | dfree(dcwd); | |
362 | dnewcwd(dp); | |
363 | return; | |
364 | } | |
365 | else | |
366 | cp = dfollow(*v); | |
367 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
368 | dp->di_name = cp; | |
369 | dp->di_count = 0; | |
370 | dp->di_next = dcwd->di_next; | |
371 | dp->di_prev = dcwd->di_prev; | |
372 | dp->di_prev->di_next = dp; | |
373 | dp->di_next->di_prev = dp; | |
374 | dfree(dcwd); | |
375 | dnewcwd(dp); | |
376 | } | |
377 | ||
378 | static Char * | |
379 | dgoto(cp) | |
380 | Char *cp; | |
381 | { | |
382 | Char *dp; | |
383 | ||
384 | if (*cp != '/') { | |
385 | register Char *p, *q; | |
386 | int cwdlen; | |
387 | ||
388 | for (p = dcwd->di_name; *p++;); | |
389 | if ((cwdlen = p - dcwd->di_name - 1) == 1) /* root */ | |
390 | cwdlen = 0; | |
391 | for (p = cp; *p++;); | |
392 | dp = (Char *) xmalloc((size_t)((cwdlen + (p - cp) + 1) * sizeof(Char))); | |
393 | for (p = dp, q = dcwd->di_name; *p++ = *q++;); | |
394 | if (cwdlen) | |
395 | p[-1] = '/'; | |
396 | else | |
397 | p--; /* don't add a / after root */ | |
398 | for (q = cp; *p++ = *q++;); | |
399 | xfree((ptr_t) cp); | |
400 | cp = dp; | |
401 | dp += cwdlen; | |
402 | } | |
403 | else | |
404 | dp = cp; | |
405 | ||
406 | cp = dcanon(cp, dp); | |
407 | return cp; | |
408 | } | |
409 | ||
410 | /* | |
411 | * dfollow - change to arg directory; fall back on cdpath if not valid | |
412 | */ | |
413 | static Char * | |
414 | dfollow(cp) | |
415 | register Char *cp; | |
416 | { | |
417 | register Char *dp; | |
418 | struct varent *c; | |
419 | char ebuf[MAXPATHLEN]; | |
420 | int serrno; | |
421 | ||
422 | cp = globone(cp, G_ERROR); | |
423 | /* | |
424 | * if we are ignoring symlinks, try to fix relatives now. | |
425 | */ | |
426 | dp = dnormalize(cp); | |
427 | if (chdir(short2str(dp)) >= 0) { | |
428 | xfree((ptr_t) cp); | |
429 | return dgoto(dp); | |
430 | } | |
431 | else { | |
432 | xfree((ptr_t) dp); | |
433 | if (chdir(short2str(cp)) >= 0) | |
434 | return dgoto(cp); | |
435 | serrno = errno; | |
436 | } | |
437 | ||
438 | if (cp[0] != '/' && !prefix(STRdotsl, cp) && !prefix(STRdotdotsl, cp) | |
439 | && (c = adrof(STRcdpath))) { | |
440 | Char **cdp; | |
441 | register Char *p; | |
442 | Char buf[MAXPATHLEN]; | |
443 | ||
444 | for (cdp = c->vec; *cdp; cdp++) { | |
445 | for (dp = buf, p = *cdp; *dp++ = *p++;); | |
446 | dp[-1] = '/'; | |
447 | for (p = cp; *dp++ = *p++;); | |
448 | if (chdir(short2str(buf)) >= 0) { | |
449 | printd = 1; | |
450 | xfree((ptr_t) cp); | |
451 | cp = Strsave(buf); | |
452 | return dgoto(cp); | |
453 | } | |
454 | } | |
455 | } | |
456 | dp = value(cp); | |
457 | if ((dp[0] == '/' || dp[0] == '.') && chdir(short2str(dp)) >= 0) { | |
458 | xfree((ptr_t) cp); | |
459 | cp = Strsave(dp); | |
460 | printd = 1; | |
461 | return dgoto(cp); | |
462 | } | |
463 | (void) strcpy(ebuf, short2str(cp)); | |
464 | xfree((ptr_t) cp); | |
465 | stderror(ERR_SYSTEM, ebuf, strerror(serrno)); | |
466 | return (NULL); | |
467 | } | |
468 | ||
469 | ||
470 | /* | |
471 | * dopushd - push new directory onto directory stack. | |
472 | * with no arguments exchange top and second. | |
473 | * with numeric argument (+n) bring it to top. | |
474 | */ | |
475 | void | |
476 | dopushd(v) | |
477 | Char **v; | |
478 | { | |
479 | register struct directory *dp; | |
480 | ||
481 | skipargs(&v, " [<dir>|+<n>]"); | |
482 | printd = 1; | |
483 | if (*v == NULL) { | |
484 | char *tmp; | |
485 | ||
486 | if ((dp = dcwd->di_prev) == &dhead) | |
487 | dp = dhead.di_prev; | |
488 | if (dp == dcwd) | |
489 | stderror(ERR_NAME | ERR_NODIR); | |
490 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
491 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
492 | dp->di_prev->di_next = dp->di_next; | |
493 | dp->di_next->di_prev = dp->di_prev; | |
494 | dp->di_next = dcwd->di_next; | |
495 | dp->di_prev = dcwd; | |
496 | dcwd->di_next->di_prev = dp; | |
497 | dcwd->di_next = dp; | |
498 | } | |
499 | else if (v[1] != NULL) { | |
500 | stderror(ERR_NAME | ERR_TOOMANY); | |
501 | /* NOTREACHED */ | |
502 | return; | |
503 | } | |
504 | else if (dp = dfind(*v)) { | |
505 | char *tmp; | |
506 | ||
507 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
508 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
509 | } | |
510 | else { | |
511 | register Char *ccp; | |
512 | ||
513 | ccp = dfollow(*v); | |
514 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
515 | dp->di_name = ccp; | |
516 | dp->di_count = 0; | |
517 | dp->di_prev = dcwd; | |
518 | dp->di_next = dcwd->di_next; | |
519 | dcwd->di_next = dp; | |
520 | dp->di_next->di_prev = dp; | |
521 | } | |
522 | dnewcwd(dp); | |
523 | } | |
524 | ||
525 | /* | |
526 | * dfind - find a directory if specified by numeric (+n) argument | |
527 | */ | |
528 | static struct directory * | |
529 | dfind(cp) | |
530 | register Char *cp; | |
531 | { | |
532 | register struct directory *dp; | |
533 | register int i; | |
534 | register Char *ep; | |
535 | ||
536 | if (*cp++ != '+') | |
537 | return (0); | |
538 | for (ep = cp; Isdigit(*ep); ep++) | |
539 | continue; | |
540 | if (*ep) | |
541 | return (0); | |
542 | i = getn(cp); | |
543 | if (i <= 0) | |
544 | return (0); | |
545 | for (dp = dcwd; i != 0; i--) { | |
546 | if ((dp = dp->di_prev) == &dhead) | |
547 | dp = dp->di_prev; | |
548 | if (dp == dcwd) | |
549 | stderror(ERR_NAME | ERR_DEEP); | |
550 | } | |
551 | return (dp); | |
552 | } | |
553 | ||
554 | /* | |
555 | * dopopd - pop a directory out of the directory stack | |
556 | * with a numeric argument just discard it. | |
557 | */ | |
558 | void | |
559 | dopopd(v) | |
560 | Char **v; | |
561 | { | |
562 | register struct directory *dp, *p = NULL; | |
563 | ||
564 | skipargs(&v, " [+<n>]"); | |
565 | printd = 1; | |
566 | if (*v == NULL) | |
567 | dp = dcwd; | |
568 | else if (v[1] != NULL) { | |
569 | stderror(ERR_NAME | ERR_TOOMANY); | |
570 | /* NOTREACHED */ | |
571 | return; | |
572 | } | |
573 | else if ((dp = dfind(*v)) == 0) | |
574 | stderror(ERR_NAME | ERR_BADDIR); | |
575 | if (dp->di_prev == &dhead && dp->di_next == &dhead) | |
576 | stderror(ERR_NAME | ERR_EMPTY); | |
577 | if (dp == dcwd) { | |
578 | char *tmp; | |
579 | ||
580 | if ((p = dp->di_prev) == &dhead) | |
581 | p = dhead.di_prev; | |
582 | if (chdir(tmp = short2str(p->di_name)) < 0) | |
583 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
584 | } | |
585 | dp->di_prev->di_next = dp->di_next; | |
586 | dp->di_next->di_prev = dp->di_prev; | |
587 | if (dp == dcwd) | |
588 | dnewcwd(p); | |
589 | else { | |
590 | printdirs(); | |
591 | } | |
592 | dfree(dp); | |
593 | } | |
594 | ||
595 | /* | |
596 | * dfree - free the directory (or keep it if it still has ref count) | |
597 | */ | |
598 | void | |
599 | dfree(dp) | |
600 | register struct directory *dp; | |
601 | { | |
602 | ||
603 | if (dp->di_count != 0) { | |
604 | dp->di_next = dp->di_prev = 0; | |
605 | } | |
606 | else { | |
607 | xfree((char *) dp->di_name); | |
608 | xfree((ptr_t) dp); | |
609 | } | |
610 | } | |
611 | ||
612 | /* | |
613 | * dcanon - canonicalize the pathname, removing excess ./ and ../ etc. | |
614 | * we are of course assuming that the file system is standardly | |
615 | * constructed (always have ..'s, directories have links) | |
616 | */ | |
617 | Char * | |
618 | dcanon(cp, p) | |
619 | register Char *cp, *p; | |
620 | { | |
621 | register Char *sp; | |
622 | register Char *p1, *p2; /* general purpose */ | |
623 | bool slash; | |
624 | ||
625 | Char link[MAXPATHLEN]; | |
626 | char tlink[MAXPATHLEN]; | |
627 | int cc; | |
628 | Char *newcp; | |
629 | ||
630 | /* | |
631 | * christos: if the path given does not start with a slash prepend cwd. If | |
632 | * cwd does not start with a path or the result would be too long abort(). | |
633 | */ | |
634 | if (*cp != '/') { | |
635 | Char tmpdir[MAXPATHLEN]; | |
636 | ||
637 | p1 = value(STRcwd); | |
638 | if (p1 == NULL || *p1 != '/') | |
639 | abort(); | |
640 | if (Strlen(p1) + Strlen(cp) + 1 >= MAXPATHLEN) | |
641 | abort(); | |
642 | (void) Strcpy(tmpdir, p1); | |
643 | (void) Strcat(tmpdir, STRslash); | |
644 | (void) Strcat(tmpdir, cp); | |
645 | xfree((ptr_t) cp); | |
646 | cp = p = Strsave(tmpdir); | |
647 | } | |
648 | ||
649 | while (*p) { /* for each component */ | |
650 | sp = p; /* save slash address */ | |
651 | while (*++p == '/') /* flush extra slashes */ | |
652 | ; | |
653 | if (p != ++sp) | |
654 | for (p1 = sp, p2 = p; *p1++ = *p2++;); | |
655 | p = sp; /* save start of component */ | |
656 | slash = 0; | |
657 | while (*++p) /* find next slash or end of path */ | |
658 | if (*p == '/') { | |
659 | slash = 1; | |
660 | *p = 0; | |
661 | break; | |
662 | } | |
663 | ||
664 | if (*sp == '\0') /* if component is null */ | |
665 | if (--sp == cp) /* if path is one char (i.e. /) */ | |
666 | break; | |
667 | else | |
668 | *sp = '\0'; | |
669 | else if (sp[0] == '.' && sp[1] == 0) { | |
670 | if (slash) { | |
671 | for (p1 = sp, p2 = p + 1; *p1++ = *p2++;); | |
672 | p = --sp; | |
673 | } | |
674 | else if (--sp != cp) | |
675 | *sp = '\0'; | |
676 | } | |
677 | else if (sp[0] == '.' && sp[1] == '.' && sp[2] == 0) { | |
678 | /* | |
679 | * We have something like "yyy/xxx/..", where "yyy" can be null or | |
680 | * a path starting at /, and "xxx" is a single component. Before | |
681 | * compressing "xxx/..", we want to expand "yyy/xxx", if it is a | |
682 | * symbolic link. | |
683 | */ | |
684 | *--sp = 0; /* form the pathname for readlink */ | |
685 | if (sp != cp && !adrof(STRignore_symlinks) && | |
686 | (cc = readlink(short2str(cp), tlink, | |
687 | sizeof tlink)) >= 0) { | |
688 | (void) Strcpy(link, str2short(tlink)); | |
689 | link[cc] = '\0'; | |
690 | ||
691 | if (slash) | |
692 | *p = '/'; | |
693 | /* | |
694 | * Point p to the '/' in "/..", and restore the '/'. | |
695 | */ | |
696 | *(p = sp) = '/'; | |
697 | /* | |
698 | * find length of p | |
699 | */ | |
700 | for (p1 = p; *p1++;); | |
701 | if (*link != '/') { | |
702 | /* | |
703 | * Relative path, expand it between the "yyy/" and the | |
704 | * "/..". First, back sp up to the character past "yyy/". | |
705 | */ | |
706 | while (*--sp != '/'); | |
707 | sp++; | |
708 | *sp = 0; | |
709 | /* | |
710 | * New length is "yyy/" + link + "/.." and rest | |
711 | */ | |
712 | p1 = newcp = (Char *) xmalloc((size_t) | |
713 | (((sp - cp) + cc + (p1 - p)) * | |
714 | sizeof(Char))); | |
715 | /* | |
716 | * Copy new path into newcp | |
717 | */ | |
718 | for (p2 = cp; *p1++ = *p2++;); | |
719 | for (p1--, p2 = link; *p1++ = *p2++;); | |
720 | for (p1--, p2 = p; *p1++ = *p2++;); | |
721 | /* | |
722 | * Restart canonicalization at expanded "/xxx". | |
723 | */ | |
724 | p = sp - cp - 1 + newcp; | |
725 | } | |
726 | else { | |
727 | /* | |
728 | * New length is link + "/.." and rest | |
729 | */ | |
730 | p1 = newcp = (Char *) xmalloc((size_t) | |
731 | ((cc + (p1 - p)) * sizeof(Char))); | |
732 | /* | |
733 | * Copy new path into newcp | |
734 | */ | |
735 | for (p2 = link; *p1++ = *p2++;); | |
736 | for (p1--, p2 = p; *p1++ = *p2++;); | |
737 | /* | |
738 | * Restart canonicalization at beginning | |
739 | */ | |
740 | p = newcp; | |
741 | } | |
742 | xfree((ptr_t) cp); | |
743 | cp = newcp; | |
744 | continue; /* canonicalize the link */ | |
745 | } | |
746 | *sp = '/'; | |
747 | if (sp != cp) | |
748 | while (*--sp != '/'); | |
749 | if (slash) { | |
750 | for (p1 = sp + 1, p2 = p + 1; *p1++ = *p2++;); | |
751 | p = sp; | |
752 | } | |
753 | else if (cp == sp) | |
754 | *++sp = '\0'; | |
755 | else | |
756 | *sp = '\0'; | |
757 | } | |
758 | else { /* normal dir name (not . or .. or nothing) */ | |
759 | ||
760 | if (sp != cp && adrof(STRchase_symlinks) && | |
761 | !adrof(STRignore_symlinks) && | |
762 | (cc = readlink(short2str(cp), tlink, | |
763 | sizeof tlink)) >= 0) { | |
764 | (void) Strcpy(link, str2short(tlink)); | |
765 | link[cc] = '\0'; | |
766 | ||
767 | /* | |
768 | * restore the '/'. | |
769 | */ | |
770 | if (slash) | |
771 | *p = '/'; | |
772 | ||
773 | /* | |
774 | * point sp to p (rather than backing up). | |
775 | */ | |
776 | sp = p; | |
777 | ||
778 | /* | |
779 | * find length of p | |
780 | */ | |
781 | for (p1 = p; *p1++;); | |
782 | if (*link != '/') { | |
783 | /* | |
784 | * Relative path, expand it between the "yyy/" and the | |
785 | * remainder. First, back sp up to the character past | |
786 | * "yyy/". | |
787 | */ | |
788 | while (*--sp != '/'); | |
789 | sp++; | |
790 | *sp = 0; | |
791 | /* | |
792 | * New length is "yyy/" + link + "/.." and rest | |
793 | */ | |
794 | p1 = newcp = (Char *) xmalloc((size_t) | |
795 | (((sp - cp) + cc + (p1 - p)) | |
796 | * sizeof(Char))); | |
797 | /* | |
798 | * Copy new path into newcp | |
799 | */ | |
800 | for (p2 = cp; *p1++ = *p2++;); | |
801 | for (p1--, p2 = link; *p1++ = *p2++;); | |
802 | for (p1--, p2 = p; *p1++ = *p2++;); | |
803 | /* | |
804 | * Restart canonicalization at expanded "/xxx". | |
805 | */ | |
806 | p = sp - cp - 1 + newcp; | |
807 | } | |
808 | else { | |
809 | /* | |
810 | * New length is link + the rest | |
811 | */ | |
812 | p1 = newcp = (Char *) xmalloc((size_t) | |
813 | ((cc + (p1 - p)) * sizeof(Char))); | |
814 | /* | |
815 | * Copy new path into newcp | |
816 | */ | |
817 | for (p2 = link; *p1++ = *p2++;); | |
818 | for (p1--, p2 = p; *p1++ = *p2++;); | |
819 | /* | |
820 | * Restart canonicalization at beginning | |
821 | */ | |
822 | p = newcp; | |
823 | } | |
824 | xfree((ptr_t) cp); | |
825 | cp = newcp; | |
826 | continue; /* canonicalize the link */ | |
827 | } | |
828 | if (slash) | |
829 | *p = '/'; | |
830 | } | |
831 | } | |
832 | ||
833 | /* | |
834 | * fix home... | |
835 | */ | |
836 | p1 = value(STRhome); | |
837 | cc = Strlen(p1); | |
838 | /* | |
839 | * See if we're not in a subdir of STRhome | |
840 | */ | |
841 | if (p1 && *p1 == '/' && | |
842 | (Strncmp(p1, cp, cc) != 0 || (cp[cc] != '/' && cp[cc] != '\0'))) { | |
843 | static ino_t home_ino = -1; | |
844 | static dev_t home_dev = -1; | |
845 | static Char *home_ptr = NULL; | |
846 | struct stat statbuf; | |
847 | ||
848 | /* | |
849 | * Get dev and ino of STRhome | |
850 | */ | |
851 | if (home_ptr != p1 && | |
852 | stat(short2str(p1), &statbuf) != -1) { | |
853 | home_dev = statbuf.st_dev; | |
854 | home_ino = statbuf.st_ino; | |
855 | home_ptr = p1; | |
856 | } | |
857 | /* | |
858 | * Start comparing dev & ino backwards | |
859 | */ | |
860 | p2 = Strcpy(link, cp); | |
861 | for (sp = NULL; *p2 && stat(short2str(p2), &statbuf) != -1;) { | |
862 | if (statbuf.st_dev == home_dev && | |
863 | statbuf.st_ino == home_ino) { | |
864 | sp = (Char *) - 1; | |
865 | break; | |
866 | } | |
867 | if (sp = Strrchr(p2, '/')) | |
868 | *sp = '\0'; | |
869 | } | |
870 | /* | |
871 | * See if we found it | |
872 | */ | |
873 | if (*p2 && sp == (Char *) -1) { | |
874 | /* | |
875 | * Use STRhome to make '~' work | |
876 | */ | |
877 | p2 = cp + Strlen(p2); | |
878 | sp = newcp = (Char *) xmalloc((size_t) | |
879 | ((cc + Strlen(p2)) * sizeof(Char))); | |
880 | while (*p1) | |
881 | *sp++ = *p1++; | |
882 | while (*p2) | |
883 | *sp++ = *p2++; | |
884 | *sp = '\0'; | |
885 | xfree((ptr_t) cp); | |
886 | cp = newcp; | |
887 | } | |
888 | } | |
889 | return cp; | |
890 | } | |
891 | ||
892 | ||
893 | /* | |
894 | * dnewcwd - make a new directory in the loop the current one | |
895 | */ | |
896 | static void | |
897 | dnewcwd(dp) | |
898 | register struct directory *dp; | |
899 | { | |
900 | dcwd = dp; | |
901 | dset(dcwd->di_name); | |
902 | if (printd && !(adrof(STRpushdsilent))) | |
903 | printdirs(); | |
904 | } |