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 | } | |
78ed81a3 | 132 | /* EWS: dcanon frees its argument; can't just use str2short */ |
133 | cp = dcanon(Strsave(str2short(tcp)), STRNULL); | |
15637ed4 RG |
134 | } |
135 | } | |
136 | ||
137 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
138 | dp->di_name = Strsave(cp); | |
139 | dp->di_count = 0; | |
140 | dhead.di_next = dhead.di_prev = dp; | |
141 | dp->di_next = dp->di_prev = &dhead; | |
142 | printd = 0; | |
143 | dnewcwd(dp); | |
144 | } | |
145 | ||
146 | static void | |
147 | dset(dp) | |
148 | Char *dp; | |
149 | { | |
150 | /* | |
151 | * Don't call set() directly cause if the directory contains ` or | |
152 | * other junk characters glob will fail. | |
153 | */ | |
154 | register Char **vec = (Char **) xmalloc((size_t) (2 * sizeof(Char **))); | |
155 | ||
156 | vec[0] = Strsave(dp); | |
157 | vec[1] = 0; | |
158 | setq(STRcwd, vec, &shvhed); | |
159 | Setenv(STRPWD, dp); | |
160 | } | |
161 | ||
162 | #define DIR_LONG 1 | |
163 | #define DIR_VERT 2 | |
164 | #define DIR_LINE 4 | |
165 | ||
166 | static void | |
167 | skipargs(v, str) | |
168 | Char ***v; | |
169 | char *str; | |
170 | { | |
171 | Char **n = *v, *s; | |
172 | ||
173 | dirflag = 0; | |
174 | for (n++; *n != NULL && (*n)[0] == '-'; n++) | |
175 | for (s = &((*n)[1]); *s; s++) | |
176 | switch (*s) { | |
177 | case 'l': | |
178 | dirflag |= DIR_LONG; | |
179 | break; | |
180 | case 'v': | |
181 | dirflag |= DIR_VERT; | |
182 | break; | |
183 | case 'n': | |
184 | dirflag |= DIR_LINE; | |
185 | break; | |
186 | default: | |
187 | stderror(ERR_DIRUS, short2str(**v), str); | |
188 | break; | |
189 | } | |
190 | *v = n; | |
191 | } | |
192 | ||
193 | /* | |
194 | * dodirs - list all directories in directory loop | |
195 | */ | |
196 | void | |
197 | dodirs(v) | |
198 | Char **v; | |
199 | { | |
200 | skipargs(&v, ""); | |
201 | ||
202 | if (*v != NULL) | |
203 | stderror(ERR_DIRUS, "dirs", ""); | |
204 | printdirs(); | |
205 | } | |
206 | ||
207 | static void | |
208 | printdirs() | |
209 | { | |
210 | register struct directory *dp; | |
211 | Char *s, *hp = value(STRhome); | |
212 | int idx, len, cur; | |
213 | ||
214 | if (*hp == '\0') | |
215 | hp = NULL; | |
216 | dp = dcwd; | |
217 | idx = 0; | |
218 | cur = 0; | |
219 | do { | |
220 | if (dp == &dhead) | |
221 | continue; | |
222 | if (dirflag & DIR_VERT) { | |
223 | xprintf("%d\t", idx++); | |
224 | cur = 0; | |
225 | } | |
226 | if (!(dirflag & DIR_LONG) && hp != NULL && !eq(hp, STRslash) && | |
227 | prefix(hp, dp->di_name)) | |
228 | len = Strlen(s = (dp->di_name + Strlen(hp))) + 2; | |
229 | else | |
230 | len = Strlen(s = dp->di_name) + 1; | |
231 | ||
232 | cur += len; | |
233 | if ((dirflag & DIR_LINE) && cur >= 80 - 1 && len < 80) { | |
234 | xprintf("\n"); | |
235 | cur = len; | |
236 | } | |
237 | xprintf(s != dp->di_name ? "~%s%c" : "%s%c", | |
238 | short2str(s), (dirflag & DIR_VERT) ? '\n' : ' '); | |
239 | } while ((dp = dp->di_prev) != dcwd); | |
240 | if (!(dirflag & DIR_VERT)) | |
241 | xprintf("\n"); | |
242 | } | |
243 | ||
244 | void | |
245 | dtildepr(home, dir) | |
246 | register Char *home, *dir; | |
247 | { | |
248 | ||
249 | if (!eq(home, STRslash) && prefix(home, dir)) | |
250 | xprintf("~%s", short2str(dir + Strlen(home))); | |
251 | else | |
252 | xprintf("%s", short2str(dir)); | |
253 | } | |
254 | ||
255 | void | |
256 | dtilde() | |
257 | { | |
258 | struct directory *d = dcwd; | |
259 | ||
260 | do { | |
261 | if (d == &dhead) | |
262 | continue; | |
263 | d->di_name = dcanon(d->di_name, STRNULL); | |
264 | } while ((d = d->di_prev) != dcwd); | |
265 | ||
266 | dset(dcwd->di_name); | |
267 | } | |
268 | ||
269 | ||
270 | /* dnormalize(): | |
271 | * If the name starts with . or .. then we might need to normalize | |
272 | * it depending on the symbolic link flags | |
273 | */ | |
274 | Char * | |
275 | dnormalize(cp) | |
276 | Char *cp; | |
277 | { | |
278 | ||
279 | #define UC (unsigned char) | |
280 | #define ISDOT(c) (UC(c)[0] == '.' && ((UC(c)[1] == '\0') || (UC(c)[1] == '/'))) | |
281 | #define ISDOTDOT(c) (UC(c)[0] == '.' && ISDOT(&((c)[1]))) | |
282 | ||
283 | if ((unsigned char) cp[0] == '/') | |
284 | return (Strsave(cp)); | |
285 | ||
286 | if (adrof(STRignore_symlinks)) { | |
287 | int dotdot = 0; | |
288 | Char *dp, *cwd; | |
289 | ||
290 | cwd = (Char *) xmalloc((size_t) ((Strlen(dcwd->di_name) + 3) * | |
291 | sizeof(Char))); | |
292 | (void) Strcpy(cwd, dcwd->di_name); | |
293 | ||
294 | /* | |
295 | * Ignore . and count ..'s | |
296 | */ | |
297 | while (*cp) { | |
298 | if (ISDOT(cp)) { | |
299 | if (*++cp) | |
300 | cp++; | |
301 | } | |
302 | else if (ISDOTDOT(cp)) { | |
303 | dotdot++; | |
304 | cp += 2; | |
305 | if (*cp) | |
306 | cp++; | |
307 | } | |
308 | else | |
309 | break; | |
310 | } | |
311 | while (dotdot > 0) | |
312 | if ((dp = Strrchr(cwd, '/'))) { | |
313 | *dp = '\0'; | |
314 | dotdot--; | |
315 | } | |
316 | else | |
317 | break; | |
318 | ||
319 | if (*cp) { | |
320 | cwd[dotdot = Strlen(cwd)] = '/'; | |
321 | cwd[dotdot + 1] = '\0'; | |
322 | dp = Strspl(cwd, cp); | |
323 | xfree((ptr_t) cwd); | |
324 | return dp; | |
325 | } | |
326 | else { | |
327 | if (!*cwd) { | |
328 | cwd[0] = '/'; | |
329 | cwd[1] = '\0'; | |
330 | } | |
331 | return cwd; | |
332 | } | |
333 | } | |
334 | return Strsave(cp); | |
335 | } | |
336 | ||
337 | /* | |
338 | * dochngd - implement chdir command. | |
339 | */ | |
340 | void | |
341 | dochngd(v) | |
342 | Char **v; | |
343 | { | |
344 | register Char *cp; | |
345 | register struct directory *dp; | |
346 | ||
347 | skipargs(&v, " [<dir>]"); | |
348 | printd = 0; | |
349 | if (*v == NULL) { | |
350 | if ((cp = value(STRhome)) == NULL || *cp == 0) | |
351 | stderror(ERR_NAME | ERR_NOHOMEDIR); | |
352 | if (chdir(short2str(cp)) < 0) | |
353 | stderror(ERR_NAME | ERR_CANTCHANGE); | |
354 | cp = Strsave(cp); | |
355 | } | |
356 | else if (v[1] != NULL) { | |
357 | stderror(ERR_NAME | ERR_TOOMANY); | |
358 | /* NOTREACHED */ | |
359 | return; | |
360 | } | |
361 | else if ((dp = dfind(*v)) != 0) { | |
362 | char *tmp; | |
363 | ||
364 | printd = 1; | |
365 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
366 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
367 | dcwd->di_prev->di_next = dcwd->di_next; | |
368 | dcwd->di_next->di_prev = dcwd->di_prev; | |
369 | dfree(dcwd); | |
370 | dnewcwd(dp); | |
371 | return; | |
372 | } | |
373 | else | |
374 | cp = dfollow(*v); | |
375 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
376 | dp->di_name = cp; | |
377 | dp->di_count = 0; | |
378 | dp->di_next = dcwd->di_next; | |
379 | dp->di_prev = dcwd->di_prev; | |
380 | dp->di_prev->di_next = dp; | |
381 | dp->di_next->di_prev = dp; | |
382 | dfree(dcwd); | |
383 | dnewcwd(dp); | |
384 | } | |
385 | ||
386 | static Char * | |
387 | dgoto(cp) | |
388 | Char *cp; | |
389 | { | |
390 | Char *dp; | |
391 | ||
392 | if (*cp != '/') { | |
393 | register Char *p, *q; | |
394 | int cwdlen; | |
395 | ||
396 | for (p = dcwd->di_name; *p++;); | |
397 | if ((cwdlen = p - dcwd->di_name - 1) == 1) /* root */ | |
398 | cwdlen = 0; | |
399 | for (p = cp; *p++;); | |
400 | dp = (Char *) xmalloc((size_t)((cwdlen + (p - cp) + 1) * sizeof(Char))); | |
401 | for (p = dp, q = dcwd->di_name; *p++ = *q++;); | |
402 | if (cwdlen) | |
403 | p[-1] = '/'; | |
404 | else | |
405 | p--; /* don't add a / after root */ | |
406 | for (q = cp; *p++ = *q++;); | |
407 | xfree((ptr_t) cp); | |
408 | cp = dp; | |
409 | dp += cwdlen; | |
410 | } | |
411 | else | |
412 | dp = cp; | |
413 | ||
414 | cp = dcanon(cp, dp); | |
415 | return cp; | |
416 | } | |
417 | ||
418 | /* | |
419 | * dfollow - change to arg directory; fall back on cdpath if not valid | |
420 | */ | |
421 | static Char * | |
422 | dfollow(cp) | |
423 | register Char *cp; | |
424 | { | |
425 | register Char *dp; | |
426 | struct varent *c; | |
427 | char ebuf[MAXPATHLEN]; | |
428 | int serrno; | |
429 | ||
430 | cp = globone(cp, G_ERROR); | |
431 | /* | |
432 | * if we are ignoring symlinks, try to fix relatives now. | |
433 | */ | |
434 | dp = dnormalize(cp); | |
435 | if (chdir(short2str(dp)) >= 0) { | |
436 | xfree((ptr_t) cp); | |
437 | return dgoto(dp); | |
438 | } | |
439 | else { | |
440 | xfree((ptr_t) dp); | |
441 | if (chdir(short2str(cp)) >= 0) | |
442 | return dgoto(cp); | |
443 | serrno = errno; | |
444 | } | |
445 | ||
446 | if (cp[0] != '/' && !prefix(STRdotsl, cp) && !prefix(STRdotdotsl, cp) | |
447 | && (c = adrof(STRcdpath))) { | |
448 | Char **cdp; | |
449 | register Char *p; | |
450 | Char buf[MAXPATHLEN]; | |
451 | ||
452 | for (cdp = c->vec; *cdp; cdp++) { | |
453 | for (dp = buf, p = *cdp; *dp++ = *p++;); | |
454 | dp[-1] = '/'; | |
455 | for (p = cp; *dp++ = *p++;); | |
456 | if (chdir(short2str(buf)) >= 0) { | |
457 | printd = 1; | |
458 | xfree((ptr_t) cp); | |
459 | cp = Strsave(buf); | |
460 | return dgoto(cp); | |
461 | } | |
462 | } | |
463 | } | |
464 | dp = value(cp); | |
465 | if ((dp[0] == '/' || dp[0] == '.') && chdir(short2str(dp)) >= 0) { | |
466 | xfree((ptr_t) cp); | |
467 | cp = Strsave(dp); | |
468 | printd = 1; | |
469 | return dgoto(cp); | |
470 | } | |
471 | (void) strcpy(ebuf, short2str(cp)); | |
472 | xfree((ptr_t) cp); | |
473 | stderror(ERR_SYSTEM, ebuf, strerror(serrno)); | |
474 | return (NULL); | |
475 | } | |
476 | ||
477 | ||
478 | /* | |
479 | * dopushd - push new directory onto directory stack. | |
480 | * with no arguments exchange top and second. | |
481 | * with numeric argument (+n) bring it to top. | |
482 | */ | |
483 | void | |
484 | dopushd(v) | |
485 | Char **v; | |
486 | { | |
487 | register struct directory *dp; | |
488 | ||
489 | skipargs(&v, " [<dir>|+<n>]"); | |
490 | printd = 1; | |
491 | if (*v == NULL) { | |
492 | char *tmp; | |
493 | ||
494 | if ((dp = dcwd->di_prev) == &dhead) | |
495 | dp = dhead.di_prev; | |
496 | if (dp == dcwd) | |
497 | stderror(ERR_NAME | ERR_NODIR); | |
498 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
499 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
500 | dp->di_prev->di_next = dp->di_next; | |
501 | dp->di_next->di_prev = dp->di_prev; | |
502 | dp->di_next = dcwd->di_next; | |
503 | dp->di_prev = dcwd; | |
504 | dcwd->di_next->di_prev = dp; | |
505 | dcwd->di_next = dp; | |
506 | } | |
507 | else if (v[1] != NULL) { | |
508 | stderror(ERR_NAME | ERR_TOOMANY); | |
509 | /* NOTREACHED */ | |
510 | return; | |
511 | } | |
512 | else if (dp = dfind(*v)) { | |
513 | char *tmp; | |
514 | ||
515 | if (chdir(tmp = short2str(dp->di_name)) < 0) | |
516 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
517 | } | |
518 | else { | |
519 | register Char *ccp; | |
520 | ||
521 | ccp = dfollow(*v); | |
522 | dp = (struct directory *) xcalloc(sizeof(struct directory), 1); | |
523 | dp->di_name = ccp; | |
524 | dp->di_count = 0; | |
525 | dp->di_prev = dcwd; | |
526 | dp->di_next = dcwd->di_next; | |
527 | dcwd->di_next = dp; | |
528 | dp->di_next->di_prev = dp; | |
529 | } | |
530 | dnewcwd(dp); | |
531 | } | |
532 | ||
533 | /* | |
534 | * dfind - find a directory if specified by numeric (+n) argument | |
535 | */ | |
536 | static struct directory * | |
537 | dfind(cp) | |
538 | register Char *cp; | |
539 | { | |
540 | register struct directory *dp; | |
541 | register int i; | |
542 | register Char *ep; | |
543 | ||
544 | if (*cp++ != '+') | |
545 | return (0); | |
546 | for (ep = cp; Isdigit(*ep); ep++) | |
547 | continue; | |
548 | if (*ep) | |
549 | return (0); | |
550 | i = getn(cp); | |
551 | if (i <= 0) | |
552 | return (0); | |
553 | for (dp = dcwd; i != 0; i--) { | |
554 | if ((dp = dp->di_prev) == &dhead) | |
555 | dp = dp->di_prev; | |
556 | if (dp == dcwd) | |
557 | stderror(ERR_NAME | ERR_DEEP); | |
558 | } | |
559 | return (dp); | |
560 | } | |
561 | ||
562 | /* | |
563 | * dopopd - pop a directory out of the directory stack | |
564 | * with a numeric argument just discard it. | |
565 | */ | |
566 | void | |
567 | dopopd(v) | |
568 | Char **v; | |
569 | { | |
570 | register struct directory *dp, *p = NULL; | |
571 | ||
572 | skipargs(&v, " [+<n>]"); | |
573 | printd = 1; | |
574 | if (*v == NULL) | |
575 | dp = dcwd; | |
576 | else if (v[1] != NULL) { | |
577 | stderror(ERR_NAME | ERR_TOOMANY); | |
578 | /* NOTREACHED */ | |
579 | return; | |
580 | } | |
581 | else if ((dp = dfind(*v)) == 0) | |
582 | stderror(ERR_NAME | ERR_BADDIR); | |
583 | if (dp->di_prev == &dhead && dp->di_next == &dhead) | |
584 | stderror(ERR_NAME | ERR_EMPTY); | |
585 | if (dp == dcwd) { | |
586 | char *tmp; | |
587 | ||
588 | if ((p = dp->di_prev) == &dhead) | |
589 | p = dhead.di_prev; | |
590 | if (chdir(tmp = short2str(p->di_name)) < 0) | |
591 | stderror(ERR_SYSTEM, tmp, strerror(errno)); | |
592 | } | |
593 | dp->di_prev->di_next = dp->di_next; | |
594 | dp->di_next->di_prev = dp->di_prev; | |
595 | if (dp == dcwd) | |
596 | dnewcwd(p); | |
597 | else { | |
598 | printdirs(); | |
599 | } | |
600 | dfree(dp); | |
601 | } | |
602 | ||
603 | /* | |
604 | * dfree - free the directory (or keep it if it still has ref count) | |
605 | */ | |
606 | void | |
607 | dfree(dp) | |
608 | register struct directory *dp; | |
609 | { | |
610 | ||
611 | if (dp->di_count != 0) { | |
612 | dp->di_next = dp->di_prev = 0; | |
613 | } | |
614 | else { | |
615 | xfree((char *) dp->di_name); | |
616 | xfree((ptr_t) dp); | |
617 | } | |
618 | } | |
619 | ||
620 | /* | |
621 | * dcanon - canonicalize the pathname, removing excess ./ and ../ etc. | |
622 | * we are of course assuming that the file system is standardly | |
623 | * constructed (always have ..'s, directories have links) | |
624 | */ | |
625 | Char * | |
626 | dcanon(cp, p) | |
627 | register Char *cp, *p; | |
628 | { | |
629 | register Char *sp; | |
630 | register Char *p1, *p2; /* general purpose */ | |
631 | bool slash; | |
632 | ||
633 | Char link[MAXPATHLEN]; | |
634 | char tlink[MAXPATHLEN]; | |
635 | int cc; | |
636 | Char *newcp; | |
637 | ||
638 | /* | |
639 | * christos: if the path given does not start with a slash prepend cwd. If | |
640 | * cwd does not start with a path or the result would be too long abort(). | |
641 | */ | |
642 | if (*cp != '/') { | |
643 | Char tmpdir[MAXPATHLEN]; | |
644 | ||
645 | p1 = value(STRcwd); | |
646 | if (p1 == NULL || *p1 != '/') | |
647 | abort(); | |
648 | if (Strlen(p1) + Strlen(cp) + 1 >= MAXPATHLEN) | |
649 | abort(); | |
650 | (void) Strcpy(tmpdir, p1); | |
651 | (void) Strcat(tmpdir, STRslash); | |
652 | (void) Strcat(tmpdir, cp); | |
653 | xfree((ptr_t) cp); | |
654 | cp = p = Strsave(tmpdir); | |
655 | } | |
656 | ||
657 | while (*p) { /* for each component */ | |
658 | sp = p; /* save slash address */ | |
659 | while (*++p == '/') /* flush extra slashes */ | |
660 | ; | |
661 | if (p != ++sp) | |
662 | for (p1 = sp, p2 = p; *p1++ = *p2++;); | |
663 | p = sp; /* save start of component */ | |
664 | slash = 0; | |
665 | while (*++p) /* find next slash or end of path */ | |
666 | if (*p == '/') { | |
667 | slash = 1; | |
668 | *p = 0; | |
669 | break; | |
670 | } | |
671 | ||
672 | if (*sp == '\0') /* if component is null */ | |
673 | if (--sp == cp) /* if path is one char (i.e. /) */ | |
674 | break; | |
675 | else | |
676 | *sp = '\0'; | |
677 | else if (sp[0] == '.' && sp[1] == 0) { | |
678 | if (slash) { | |
679 | for (p1 = sp, p2 = p + 1; *p1++ = *p2++;); | |
680 | p = --sp; | |
681 | } | |
682 | else if (--sp != cp) | |
683 | *sp = '\0'; | |
684 | } | |
685 | else if (sp[0] == '.' && sp[1] == '.' && sp[2] == 0) { | |
686 | /* | |
687 | * We have something like "yyy/xxx/..", where "yyy" can be null or | |
688 | * a path starting at /, and "xxx" is a single component. Before | |
689 | * compressing "xxx/..", we want to expand "yyy/xxx", if it is a | |
690 | * symbolic link. | |
691 | */ | |
692 | *--sp = 0; /* form the pathname for readlink */ | |
693 | if (sp != cp && !adrof(STRignore_symlinks) && | |
694 | (cc = readlink(short2str(cp), tlink, | |
695 | sizeof tlink)) >= 0) { | |
696 | (void) Strcpy(link, str2short(tlink)); | |
697 | link[cc] = '\0'; | |
698 | ||
699 | if (slash) | |
700 | *p = '/'; | |
701 | /* | |
702 | * Point p to the '/' in "/..", and restore the '/'. | |
703 | */ | |
704 | *(p = sp) = '/'; | |
705 | /* | |
706 | * find length of p | |
707 | */ | |
708 | for (p1 = p; *p1++;); | |
709 | if (*link != '/') { | |
710 | /* | |
711 | * Relative path, expand it between the "yyy/" and the | |
712 | * "/..". First, back sp up to the character past "yyy/". | |
713 | */ | |
714 | while (*--sp != '/'); | |
715 | sp++; | |
716 | *sp = 0; | |
717 | /* | |
718 | * New length is "yyy/" + link + "/.." and rest | |
719 | */ | |
720 | p1 = newcp = (Char *) xmalloc((size_t) | |
721 | (((sp - cp) + cc + (p1 - p)) * | |
722 | sizeof(Char))); | |
723 | /* | |
724 | * Copy new path into newcp | |
725 | */ | |
726 | for (p2 = cp; *p1++ = *p2++;); | |
727 | for (p1--, p2 = link; *p1++ = *p2++;); | |
728 | for (p1--, p2 = p; *p1++ = *p2++;); | |
729 | /* | |
730 | * Restart canonicalization at expanded "/xxx". | |
731 | */ | |
732 | p = sp - cp - 1 + newcp; | |
733 | } | |
734 | else { | |
735 | /* | |
736 | * New length is link + "/.." and rest | |
737 | */ | |
738 | p1 = newcp = (Char *) xmalloc((size_t) | |
739 | ((cc + (p1 - p)) * sizeof(Char))); | |
740 | /* | |
741 | * Copy new path into newcp | |
742 | */ | |
743 | for (p2 = link; *p1++ = *p2++;); | |
744 | for (p1--, p2 = p; *p1++ = *p2++;); | |
745 | /* | |
746 | * Restart canonicalization at beginning | |
747 | */ | |
748 | p = newcp; | |
749 | } | |
750 | xfree((ptr_t) cp); | |
751 | cp = newcp; | |
752 | continue; /* canonicalize the link */ | |
753 | } | |
754 | *sp = '/'; | |
755 | if (sp != cp) | |
756 | while (*--sp != '/'); | |
757 | if (slash) { | |
758 | for (p1 = sp + 1, p2 = p + 1; *p1++ = *p2++;); | |
759 | p = sp; | |
760 | } | |
761 | else if (cp == sp) | |
762 | *++sp = '\0'; | |
763 | else | |
764 | *sp = '\0'; | |
765 | } | |
766 | else { /* normal dir name (not . or .. or nothing) */ | |
767 | ||
768 | if (sp != cp && adrof(STRchase_symlinks) && | |
769 | !adrof(STRignore_symlinks) && | |
770 | (cc = readlink(short2str(cp), tlink, | |
771 | sizeof tlink)) >= 0) { | |
772 | (void) Strcpy(link, str2short(tlink)); | |
773 | link[cc] = '\0'; | |
774 | ||
775 | /* | |
776 | * restore the '/'. | |
777 | */ | |
778 | if (slash) | |
779 | *p = '/'; | |
780 | ||
781 | /* | |
782 | * point sp to p (rather than backing up). | |
783 | */ | |
784 | sp = p; | |
785 | ||
786 | /* | |
787 | * find length of p | |
788 | */ | |
789 | for (p1 = p; *p1++;); | |
790 | if (*link != '/') { | |
791 | /* | |
792 | * Relative path, expand it between the "yyy/" and the | |
793 | * remainder. First, back sp up to the character past | |
794 | * "yyy/". | |
795 | */ | |
796 | while (*--sp != '/'); | |
797 | sp++; | |
798 | *sp = 0; | |
799 | /* | |
800 | * New length is "yyy/" + link + "/.." and rest | |
801 | */ | |
802 | p1 = newcp = (Char *) xmalloc((size_t) | |
803 | (((sp - cp) + cc + (p1 - p)) | |
804 | * sizeof(Char))); | |
805 | /* | |
806 | * Copy new path into newcp | |
807 | */ | |
808 | for (p2 = cp; *p1++ = *p2++;); | |
809 | for (p1--, p2 = link; *p1++ = *p2++;); | |
810 | for (p1--, p2 = p; *p1++ = *p2++;); | |
811 | /* | |
812 | * Restart canonicalization at expanded "/xxx". | |
813 | */ | |
814 | p = sp - cp - 1 + newcp; | |
815 | } | |
816 | else { | |
817 | /* | |
818 | * New length is link + the rest | |
819 | */ | |
820 | p1 = newcp = (Char *) xmalloc((size_t) | |
821 | ((cc + (p1 - p)) * sizeof(Char))); | |
822 | /* | |
823 | * Copy new path into newcp | |
824 | */ | |
825 | for (p2 = link; *p1++ = *p2++;); | |
826 | for (p1--, p2 = p; *p1++ = *p2++;); | |
827 | /* | |
828 | * Restart canonicalization at beginning | |
829 | */ | |
830 | p = newcp; | |
831 | } | |
832 | xfree((ptr_t) cp); | |
833 | cp = newcp; | |
834 | continue; /* canonicalize the link */ | |
835 | } | |
836 | if (slash) | |
837 | *p = '/'; | |
838 | } | |
839 | } | |
840 | ||
841 | /* | |
842 | * fix home... | |
843 | */ | |
844 | p1 = value(STRhome); | |
845 | cc = Strlen(p1); | |
846 | /* | |
847 | * See if we're not in a subdir of STRhome | |
848 | */ | |
849 | if (p1 && *p1 == '/' && | |
850 | (Strncmp(p1, cp, cc) != 0 || (cp[cc] != '/' && cp[cc] != '\0'))) { | |
851 | static ino_t home_ino = -1; | |
852 | static dev_t home_dev = -1; | |
853 | static Char *home_ptr = NULL; | |
854 | struct stat statbuf; | |
855 | ||
856 | /* | |
857 | * Get dev and ino of STRhome | |
858 | */ | |
859 | if (home_ptr != p1 && | |
860 | stat(short2str(p1), &statbuf) != -1) { | |
861 | home_dev = statbuf.st_dev; | |
862 | home_ino = statbuf.st_ino; | |
863 | home_ptr = p1; | |
864 | } | |
865 | /* | |
866 | * Start comparing dev & ino backwards | |
867 | */ | |
868 | p2 = Strcpy(link, cp); | |
869 | for (sp = NULL; *p2 && stat(short2str(p2), &statbuf) != -1;) { | |
870 | if (statbuf.st_dev == home_dev && | |
871 | statbuf.st_ino == home_ino) { | |
872 | sp = (Char *) - 1; | |
873 | break; | |
874 | } | |
875 | if (sp = Strrchr(p2, '/')) | |
876 | *sp = '\0'; | |
877 | } | |
878 | /* | |
879 | * See if we found it | |
880 | */ | |
881 | if (*p2 && sp == (Char *) -1) { | |
882 | /* | |
883 | * Use STRhome to make '~' work | |
884 | */ | |
885 | p2 = cp + Strlen(p2); | |
886 | sp = newcp = (Char *) xmalloc((size_t) | |
887 | /* 19 Sep 92*/ ((cc + Strlen(p2) + 1) * sizeof(Char))); | |
888 | while (*p1) | |
889 | *sp++ = *p1++; | |
890 | while (*p2) | |
891 | *sp++ = *p2++; | |
892 | *sp = '\0'; | |
893 | xfree((ptr_t) cp); | |
894 | cp = newcp; | |
895 | } | |
896 | } | |
897 | return cp; | |
898 | } | |
899 | ||
900 | ||
901 | /* | |
902 | * dnewcwd - make a new directory in the loop the current one | |
903 | */ | |
904 | static void | |
905 | dnewcwd(dp) | |
906 | register struct directory *dp; | |
907 | { | |
908 | dcwd = dp; | |
909 | dset(dcwd->di_name); | |
910 | if (printd && !(adrof(STRpushdsilent))) | |
911 | printdirs(); | |
912 | } |