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[perl5.git] / ext / Cwd / Cwd.xs
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1#include "EXTERN.h"
2#include "perl.h"
3#include "XSUB.h"
4
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5#ifdef I_UNISTD
6# include <unistd.h>
7#endif
8
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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)
50static 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 */
66static
67char *
68bsd_realpath(path, resolved)
69 const char *path;
70 char *resolved;
71{
e3d944f4 72#ifdef VMS
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73 dTHX;
74 return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0);
e3d944f4 75#else
91f3b821 76 int rootd, serrno;
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77 char *p, *q, wbuf[MAXPATHLEN];
78 int symlinks = 0;
79
80 /* Save the starting point. */
e3d944f4 81#ifdef HAS_FCHDIR
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82 int fd;
83
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84 if ((fd = open(".", O_RDONLY)) < 0) {
85 (void)strcpy(resolved, ".");
86 return (NULL);
87 }
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88#else
89 char wd[MAXPATHLEN];
90
91 if (getcwd(wd, MAXPATHLEN - 1) == NULL) {
92 (void)strcpy(resolved, ".");
93 return (NULL);
94 }
95#endif
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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';
107loop:
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)
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126 {
127 struct stat sb;
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128 /* Deal with the last component. */
129 if (lstat(p, &sb) == 0) {
130 if (S_ISLNK(sb.st_mode)) {
91f3b821 131 int n;
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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
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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) {
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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
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180 if (fchdir(fd) < 0) {
181 serrno = errno;
182 goto err2;
183 }
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184#else
185 if (chdir(wd) < 0) {
186 serrno = errno;
187 goto err2;
188 }
189#endif
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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
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195 return (resolved);
196
197err1: serrno = errno;
29ab7413 198#ifdef HAS_FCHDIR
03d70c89 199 (void)fchdir(fd);
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200#else
201 (void)chdir(wd);
202#endif
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203
204err2:
205#ifdef HAS_FCHDIR
206 (void)close(fd);
207#endif
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208 errno = serrno;
209 return (NULL);
e3d944f4 210#endif
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211}
212
a9939470 213#ifndef getcwd_sv
1955c8df 214/* Taken from perl 5.8's util.c */
a9939470
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215int 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 364MODULE = Cwd PACKAGE = Cwd
0d2079fa 365
f22d8e4b 366PROTOTYPES: ENABLE
0d2079fa 367
f22d8e4b
DM
368void
369fastcwd()
7ddb28a3 370PROTOTYPE: DISABLE
f22d8e4b
DM
371PPCODE:
372{
373 dXSTARG;
89423764 374 getcwd_sv(TARG);
f22d8e4b 375 XSprePUSH; PUSHTARG;
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376#ifndef INCOMPLETE_TAINTS
377 SvTAINTED_on(TARG);
378#endif
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379}
380
f22d8e4b 381void
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382abs_path(pathsv=Nullsv)
383 SV *pathsv
f22d8e4b 384PPCODE:
2ae52c40 385{
f22d8e4b
DM
386 dXSTARG;
387 char *path;
00536bfc 388 char buf[MAXPATHLEN];
03d70c89 389
ea715489 390 path = pathsv ? SvPV_nolen(pathsv) : ".";
03d70c89 391
00536bfc
JH
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
JH
401#ifndef INCOMPLETE_TAINTS
402 SvTAINTED_on(TARG);
403#endif
2ae52c40 404}