Commit | Line | Data |
0d2079fa |
1 | #include "EXTERN.h" |
2 | #include "perl.h" |
3 | #include "XSUB.h" |
4 | |
c70498c1 |
5 | #ifdef I_UNISTD |
6 | # include <unistd.h> |
7 | #endif |
8 | |
03d70c89 |
9 | /* The realpath() implementation from OpenBSD 2.9 (realpath.c 1.4) |
10 | * Renamed here to bsd_realpath() to avoid library conflicts. |
11 | * --jhi 2000-06-20 */ |
12 | |
13 | /* |
14 | * Copyright (c) 1994 |
15 | * The Regents of the University of California. All rights reserved. |
16 | * |
17 | * This code is derived from software contributed to Berkeley by |
18 | * Jan-Simon Pendry. |
19 | * |
20 | * Redistribution and use in source and binary forms, with or without |
21 | * modification, are permitted provided that the following conditions |
22 | * are met: |
23 | * 1. Redistributions of source code must retain the above copyright |
24 | * notice, this list of conditions and the following disclaimer. |
25 | * 2. Redistributions in binary form must reproduce the above copyright |
26 | * notice, this list of conditions and the following disclaimer in the |
27 | * documentation and/or other materials provided with the distribution. |
28 | * 3. All advertising materials mentioning features or use of this software |
29 | * must display the following acknowledgement: |
30 | * This product includes software developed by the University of |
31 | * California, Berkeley and its contributors. |
32 | * 4. Neither the name of the University nor the names of its contributors |
33 | * may be used to endorse or promote products derived from this software |
34 | * without specific prior written permission. |
35 | * |
36 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
37 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
38 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
39 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
40 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
41 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
42 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
43 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
44 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
45 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
46 | * SUCH DAMAGE. |
47 | */ |
48 | |
49 | #if defined(LIBC_SCCS) && !defined(lint) |
50 | static char *rcsid = "$OpenBSD: realpath.c,v 1.4 1998/05/18 09:55:19 deraadt Exp $"; |
51 | #endif /* LIBC_SCCS and not lint */ |
52 | |
53 | /* OpenBSD system #includes removed since the Perl ones should do. --jhi */ |
54 | |
55 | #ifndef MAXSYMLINKS |
56 | #define MAXSYMLINKS 8 |
57 | #endif |
58 | |
59 | /* |
60 | * char *realpath(const char *path, char resolved_path[MAXPATHLEN]); |
61 | * |
62 | * Find the real name of path, by removing all ".", ".." and symlink |
63 | * components. Returns (resolved) on success, or (NULL) on failure, |
64 | * in which case the path which caused trouble is left in (resolved). |
65 | */ |
66 | static |
67 | char * |
68 | bsd_realpath(path, resolved) |
69 | const char *path; |
70 | char *resolved; |
71 | { |
e3d944f4 |
72 | #ifdef VMS |
32af7c23 |
73 | dTHX; |
74 | return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0); |
e3d944f4 |
75 | #else |
91f3b821 |
76 | int rootd, serrno; |
03d70c89 |
77 | char *p, *q, wbuf[MAXPATHLEN]; |
78 | int symlinks = 0; |
79 | |
80 | /* Save the starting point. */ |
e3d944f4 |
81 | #ifdef HAS_FCHDIR |
bae06e14 |
82 | int fd; |
83 | |
03d70c89 |
84 | if ((fd = open(".", O_RDONLY)) < 0) { |
85 | (void)strcpy(resolved, "."); |
86 | return (NULL); |
87 | } |
e3d944f4 |
88 | #else |
89 | char wd[MAXPATHLEN]; |
90 | |
91 | if (getcwd(wd, MAXPATHLEN - 1) == NULL) { |
92 | (void)strcpy(resolved, "."); |
93 | return (NULL); |
94 | } |
95 | #endif |
03d70c89 |
96 | |
97 | /* |
98 | * Find the dirname and basename from the path to be resolved. |
99 | * Change directory to the dirname component. |
100 | * lstat the basename part. |
101 | * if it is a symlink, read in the value and loop. |
102 | * if it is a directory, then change to that directory. |
103 | * get the current directory name and append the basename. |
104 | */ |
105 | (void)strncpy(resolved, path, MAXPATHLEN - 1); |
106 | resolved[MAXPATHLEN - 1] = '\0'; |
107 | loop: |
108 | q = strrchr(resolved, '/'); |
109 | if (q != NULL) { |
110 | p = q + 1; |
111 | if (q == resolved) |
112 | q = "/"; |
113 | else { |
114 | do { |
115 | --q; |
116 | } while (q > resolved && *q == '/'); |
117 | q[1] = '\0'; |
118 | q = resolved; |
119 | } |
120 | if (chdir(q) < 0) |
121 | goto err1; |
122 | } else |
123 | p = resolved; |
124 | |
bae06e14 |
125 | #if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK) |
91f3b821 |
126 | { |
127 | struct stat sb; |
03d70c89 |
128 | /* Deal with the last component. */ |
129 | if (lstat(p, &sb) == 0) { |
130 | if (S_ISLNK(sb.st_mode)) { |
91f3b821 |
131 | int n; |
03d70c89 |
132 | if (++symlinks > MAXSYMLINKS) { |
133 | errno = ELOOP; |
134 | goto err1; |
135 | } |
136 | n = readlink(p, resolved, MAXPATHLEN-1); |
137 | if (n < 0) |
138 | goto err1; |
139 | resolved[n] = '\0'; |
140 | goto loop; |
141 | } |
142 | if (S_ISDIR(sb.st_mode)) { |
143 | if (chdir(p) < 0) |
144 | goto err1; |
145 | p = ""; |
146 | } |
147 | } |
91f3b821 |
148 | } |
e3d944f4 |
149 | #endif |
03d70c89 |
150 | |
151 | /* |
152 | * Save the last component name and get the full pathname of |
153 | * the current directory. |
154 | */ |
155 | (void)strcpy(wbuf, p); |
156 | if (getcwd(resolved, MAXPATHLEN) == 0) |
157 | goto err1; |
158 | |
159 | /* |
160 | * Join the two strings together, ensuring that the right thing |
161 | * happens if the last component is empty, or the dirname is root. |
162 | */ |
163 | if (resolved[0] == '/' && resolved[1] == '\0') |
164 | rootd = 1; |
165 | else |
166 | rootd = 0; |
167 | |
168 | if (*wbuf) { |
7f6e23a8 |
169 | if (strlen(resolved) + strlen(wbuf) + (1 - rootd) + 1 > MAXPATHLEN) { |
03d70c89 |
170 | errno = ENAMETOOLONG; |
171 | goto err1; |
172 | } |
173 | if (rootd == 0) |
174 | (void)strcat(resolved, "/"); |
175 | (void)strcat(resolved, wbuf); |
176 | } |
177 | |
178 | /* Go back to where we came from. */ |
e3d944f4 |
179 | #ifdef HAS_FCHDIR |
03d70c89 |
180 | if (fchdir(fd) < 0) { |
181 | serrno = errno; |
182 | goto err2; |
183 | } |
e3d944f4 |
184 | #else |
185 | if (chdir(wd) < 0) { |
186 | serrno = errno; |
187 | goto err2; |
188 | } |
189 | #endif |
03d70c89 |
190 | |
191 | /* It's okay if the close fails, what's an fd more or less? */ |
9cad6237 |
192 | #ifdef HAS_FCHDIR |
03d70c89 |
193 | (void)close(fd); |
9cad6237 |
194 | #endif |
03d70c89 |
195 | return (resolved); |
196 | |
197 | err1: serrno = errno; |
29ab7413 |
198 | #ifdef HAS_FCHDIR |
03d70c89 |
199 | (void)fchdir(fd); |
29ab7413 |
200 | #else |
201 | (void)chdir(wd); |
202 | #endif |
89423764 |
203 | |
204 | err2: |
205 | #ifdef HAS_FCHDIR |
206 | (void)close(fd); |
207 | #endif |
03d70c89 |
208 | errno = serrno; |
209 | return (NULL); |
e3d944f4 |
210 | #endif |
03d70c89 |
211 | } |
212 | |
a9939470 |
213 | #ifndef getcwd_sv |
1955c8df |
214 | /* Taken from perl 5.8's util.c */ |
a9939470 |
215 | int getcwd_sv(pTHX_ register SV *sv) |
216 | { |
217 | #ifndef PERL_MICRO |
218 | |
219 | #ifndef INCOMPLETE_TAINTS |
220 | SvTAINTED_on(sv); |
221 | #endif |
222 | |
223 | #ifdef HAS_GETCWD |
224 | { |
225 | char buf[MAXPATHLEN]; |
226 | |
227 | /* Some getcwd()s automatically allocate a buffer of the given |
228 | * size from the heap if they are given a NULL buffer pointer. |
229 | * The problem is that this behaviour is not portable. */ |
230 | if (getcwd(buf, sizeof(buf) - 1)) { |
231 | STRLEN len = strlen(buf); |
232 | sv_setpvn(sv, buf, len); |
233 | return TRUE; |
234 | } |
235 | else { |
236 | sv_setsv(sv, &PL_sv_undef); |
237 | return FALSE; |
238 | } |
239 | } |
240 | |
241 | #else |
242 | |
243 | Stat_t statbuf; |
244 | int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino; |
245 | int namelen, pathlen=0; |
246 | DIR *dir; |
247 | Direntry_t *dp; |
248 | |
249 | (void)SvUPGRADE(sv, SVt_PV); |
250 | |
251 | if (PerlLIO_lstat(".", &statbuf) < 0) { |
252 | SV_CWD_RETURN_UNDEF; |
253 | } |
254 | |
255 | orig_cdev = statbuf.st_dev; |
256 | orig_cino = statbuf.st_ino; |
257 | cdev = orig_cdev; |
258 | cino = orig_cino; |
259 | |
260 | for (;;) { |
261 | odev = cdev; |
262 | oino = cino; |
263 | |
264 | if (PerlDir_chdir("..") < 0) { |
265 | SV_CWD_RETURN_UNDEF; |
266 | } |
267 | if (PerlLIO_stat(".", &statbuf) < 0) { |
268 | SV_CWD_RETURN_UNDEF; |
269 | } |
270 | |
271 | cdev = statbuf.st_dev; |
272 | cino = statbuf.st_ino; |
273 | |
274 | if (odev == cdev && oino == cino) { |
275 | break; |
276 | } |
277 | if (!(dir = PerlDir_open("."))) { |
278 | SV_CWD_RETURN_UNDEF; |
279 | } |
280 | |
281 | while ((dp = PerlDir_read(dir)) != NULL) { |
282 | #ifdef DIRNAMLEN |
283 | namelen = dp->d_namlen; |
284 | #else |
285 | namelen = strlen(dp->d_name); |
286 | #endif |
287 | /* skip . and .. */ |
288 | if (SV_CWD_ISDOT(dp)) { |
289 | continue; |
290 | } |
291 | |
292 | if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) { |
293 | SV_CWD_RETURN_UNDEF; |
294 | } |
295 | |
296 | tdev = statbuf.st_dev; |
297 | tino = statbuf.st_ino; |
298 | if (tino == oino && tdev == odev) { |
299 | break; |
300 | } |
301 | } |
302 | |
303 | if (!dp) { |
304 | SV_CWD_RETURN_UNDEF; |
305 | } |
306 | |
307 | if (pathlen + namelen + 1 >= MAXPATHLEN) { |
308 | SV_CWD_RETURN_UNDEF; |
309 | } |
310 | |
311 | SvGROW(sv, pathlen + namelen + 1); |
312 | |
313 | if (pathlen) { |
314 | /* shift down */ |
315 | Move(SvPVX(sv), SvPVX(sv) + namelen + 1, pathlen, char); |
316 | } |
317 | |
318 | /* prepend current directory to the front */ |
319 | *SvPVX(sv) = '/'; |
320 | Move(dp->d_name, SvPVX(sv)+1, namelen, char); |
321 | pathlen += (namelen + 1); |
322 | |
323 | #ifdef VOID_CLOSEDIR |
324 | PerlDir_close(dir); |
325 | #else |
326 | if (PerlDir_close(dir) < 0) { |
327 | SV_CWD_RETURN_UNDEF; |
328 | } |
329 | #endif |
330 | } |
331 | |
332 | if (pathlen) { |
333 | SvCUR_set(sv, pathlen); |
334 | *SvEND(sv) = '\0'; |
335 | SvPOK_only(sv); |
336 | |
337 | if (PerlDir_chdir(SvPVX(sv)) < 0) { |
338 | SV_CWD_RETURN_UNDEF; |
339 | } |
340 | } |
341 | if (PerlLIO_stat(".", &statbuf) < 0) { |
342 | SV_CWD_RETURN_UNDEF; |
343 | } |
344 | |
345 | cdev = statbuf.st_dev; |
346 | cino = statbuf.st_ino; |
347 | |
348 | if (cdev != orig_cdev || cino != orig_cino) { |
349 | Perl_croak(aTHX_ "Unstable directory path, " |
350 | "current directory changed unexpectedly"); |
351 | } |
352 | |
353 | return TRUE; |
354 | #endif |
355 | |
356 | #else |
357 | return FALSE; |
358 | #endif |
359 | } |
360 | |
361 | #endif |
362 | |
363 | |
f22d8e4b |
364 | MODULE = Cwd PACKAGE = Cwd |
0d2079fa |
365 | |
f22d8e4b |
366 | PROTOTYPES: ENABLE |
0d2079fa |
367 | |
f22d8e4b |
368 | void |
369 | fastcwd() |
7ddb28a3 |
370 | PROTOTYPE: DISABLE |
f22d8e4b |
371 | PPCODE: |
372 | { |
373 | dXSTARG; |
89423764 |
374 | getcwd_sv(TARG); |
f22d8e4b |
375 | XSprePUSH; PUSHTARG; |
248785eb |
376 | #ifndef INCOMPLETE_TAINTS |
377 | SvTAINTED_on(TARG); |
378 | #endif |
0d2079fa |
379 | } |
380 | |
f22d8e4b |
381 | void |
03d70c89 |
382 | abs_path(pathsv=Nullsv) |
383 | SV *pathsv |
f22d8e4b |
384 | PPCODE: |
2ae52c40 |
385 | { |
f22d8e4b |
386 | dXSTARG; |
387 | char *path; |
00536bfc |
388 | char buf[MAXPATHLEN]; |
03d70c89 |
389 | |
ea715489 |
390 | path = pathsv ? SvPV_nolen(pathsv) : "."; |
03d70c89 |
391 | |
00536bfc |
392 | if (bsd_realpath(path, buf)) { |
393 | sv_setpvn(TARG, buf, strlen(buf)); |
394 | SvPOK_only(TARG); |
ea715489 |
395 | SvTAINTED_on(TARG); |
2ae52c40 |
396 | } |
03d70c89 |
397 | else |
ea715489 |
398 | sv_setsv(TARG, &PL_sv_undef); |
2ae52c40 |
399 | |
f22d8e4b |
400 | XSprePUSH; PUSHTARG; |
ea715489 |
401 | #ifndef INCOMPLETE_TAINTS |
402 | SvTAINTED_on(TARG); |
403 | #endif |
2ae52c40 |
404 | } |