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Add the upstream Makefile.PL for Cwd
[perl5.git] / dist / Cwd / Cwd.xs
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1#define PERL_NO_GET_CONTEXT
2
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3#include "EXTERN.h"
4#include "perl.h"
5#include "XSUB.h"
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6#define NEED_my_strlcpy
7#define NEED_my_strlcat
8#include "ppport.h"
0d2079fa 9
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10#ifdef I_UNISTD
11# include <unistd.h>
12#endif
13
bf7c0a3d 14/* The realpath() implementation from OpenBSD 3.9 to 4.2 (realpath.c 1.13)
03d70c89 15 * Renamed here to bsd_realpath() to avoid library conflicts.
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16 */
17
18/* See
19 * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-11/msg00979.html
20 * for the details of why the BSD license is compatible with the
21 * AL/GPL standard perl license.
22 */
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23
24/*
bf7c0a3d 25 * Copyright (c) 2003 Constantin S. Svintsoff <kostik@iclub.nsu.ru>
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26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the above copyright
31 * notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 * notice, this list of conditions and the following disclaimer in the
34 * documentation and/or other materials provided with the distribution.
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35 * 3. The names of the authors may not be used to endorse or promote
36 * products derived from this software without specific prior written
37 * permission.
03d70c89 38 *
6dfee1ec 39 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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40 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
bf7c0a3d 42 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
45 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
47 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
48 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49 * SUCH DAMAGE.
50 */
51
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52/* OpenBSD system #includes removed since the Perl ones should do. --jhi */
53
54#ifndef MAXSYMLINKS
55#define MAXSYMLINKS 8
56#endif
57
66a378bd 58#ifndef VMS
03d70c89 59/*
bf7c0a3d 60 * char *realpath(const char *path, char resolved[MAXPATHLEN]);
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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 *
c7304ea2 68bsd_realpath(const char *path, char resolved[MAXPATHLEN])
03d70c89 69{
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70 char *p, *q, *s;
71 size_t left_len, resolved_len;
72 unsigned symlinks;
73 int serrno;
8304a6c4 74 char left[MAXPATHLEN], next_token[MAXPATHLEN];
03d70c89 75
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76 serrno = errno;
77 symlinks = 0;
78 if (path[0] == '/') {
79 resolved[0] = '/';
80 resolved[1] = '\0';
81 if (path[1] == '\0')
82 return (resolved);
83 resolved_len = 1;
84 left_len = my_strlcpy(left, path + 1, sizeof(left));
85 } else {
86 if (getcwd(resolved, MAXPATHLEN) == NULL) {
87 my_strlcpy(resolved, ".", MAXPATHLEN);
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88 return (NULL);
89 }
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90 resolved_len = strlen(resolved);
91 left_len = my_strlcpy(left, path, sizeof(left));
92 }
93 if (left_len >= sizeof(left) || resolved_len >= MAXPATHLEN) {
94 errno = ENAMETOOLONG;
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95 return (NULL);
96 }
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97
98 /*
6dfee1ec 99 * Iterate over path components in 'left'.
03d70c89 100 */
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101 while (left_len != 0) {
102 /*
6dfee1ec 103 * Extract the next path component and adjust 'left'
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104 * and its length.
105 */
106 p = strchr(left, '/');
107 s = p ? p : left + left_len;
c33e8be1 108 if ((STRLEN)(s - left) >= (STRLEN)sizeof(next_token)) {
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109 errno = ENAMETOOLONG;
110 return (NULL);
03d70c89 111 }
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112 memcpy(next_token, left, s - left);
113 next_token[s - left] = '\0';
114 left_len -= s - left;
115 if (p != NULL)
116 memmove(left, s + 1, left_len + 1);
117 if (resolved[resolved_len - 1] != '/') {
118 if (resolved_len + 1 >= MAXPATHLEN) {
119 errno = ENAMETOOLONG;
120 return (NULL);
03d70c89 121 }
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122 resolved[resolved_len++] = '/';
123 resolved[resolved_len] = '\0';
03d70c89 124 }
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125 if (next_token[0] == '\0')
126 continue;
127 else if (strcmp(next_token, ".") == 0)
128 continue;
129 else if (strcmp(next_token, "..") == 0) {
130 /*
131 * Strip the last path component except when we have
132 * single "/"
133 */
134 if (resolved_len > 1) {
135 resolved[resolved_len - 1] = '\0';
136 q = strrchr(resolved, '/') + 1;
137 *q = '\0';
138 resolved_len = q - resolved;
139 }
140 continue;
91f3b821 141 }
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142
143 /*
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144 * Append the next path component and lstat() it. If
145 * lstat() fails we still can return successfully if
146 * there are no more path components left.
03d70c89 147 */
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148 resolved_len = my_strlcat(resolved, next_token, MAXPATHLEN);
149 if (resolved_len >= MAXPATHLEN) {
150 errno = ENAMETOOLONG;
151 return (NULL);
152 }
8304a6c4 153#if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK)
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154 {
155 struct stat sb;
156 if (lstat(resolved, &sb) != 0) {
157 if (errno == ENOENT && p == NULL) {
158 errno = serrno;
159 return (resolved);
160 }
161 return (NULL);
162 }
163 if (S_ISLNK(sb.st_mode)) {
164 int slen;
8304a6c4 165 char symlink[MAXPATHLEN];
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166
167 if (symlinks++ > MAXSYMLINKS) {
168 errno = ELOOP;
169 return (NULL);
170 }
171 slen = readlink(resolved, symlink, sizeof(symlink) - 1);
172 if (slen < 0)
173 return (NULL);
174 symlink[slen] = '\0';
175 if (symlink[0] == '/') {
176 resolved[1] = 0;
177 resolved_len = 1;
178 } else if (resolved_len > 1) {
179 /* Strip the last path component. */
180 resolved[resolved_len - 1] = '\0';
181 q = strrchr(resolved, '/') + 1;
182 *q = '\0';
183 resolved_len = q - resolved;
184 }
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185
186 /*
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187 * If there are any path components left, then
188 * append them to symlink. The result is placed
6dfee1ec 189 * in 'left'.
03d70c89 190 */
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191 if (p != NULL) {
192 if (symlink[slen - 1] != '/') {
c33e8be1 193 if ((STRLEN)(slen + 1) >= (STRLEN)sizeof(symlink)) {
8304a6c4 194 errno = ENAMETOOLONG;
c7304ea2 195 return (NULL);
8304a6c4 196 }
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197 symlink[slen] = '/';
198 symlink[slen + 1] = 0;
8304a6c4 199 }
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200 left_len = my_strlcat(symlink, left, sizeof(left));
201 if (left_len >= sizeof(left)) {
202 errno = ENAMETOOLONG;
203 return (NULL);
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204 }
205 }
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206 left_len = my_strlcpy(left, symlink, sizeof(left));
207 }
208 }
8304a6c4 209#endif
c7304ea2 210 }
03d70c89 211
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212 /*
213 * Remove trailing slash except when the resolved pathname
214 * is a single "/".
215 */
216 if (resolved_len > 1 && resolved[resolved_len - 1] == '/')
217 resolved[resolved_len - 1] = '\0';
03d70c89 218 return (resolved);
03d70c89 219}
66a378bd 220#endif
03d70c89 221
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222#ifndef SV_CWD_RETURN_UNDEF
223#define SV_CWD_RETURN_UNDEF \
224sv_setsv(sv, &PL_sv_undef); \
225return FALSE
226#endif
227
228#ifndef OPpENTERSUB_HASTARG
229#define OPpENTERSUB_HASTARG 32 /* Called from OP tree. */
230#endif
231
232#ifndef dXSTARG
233#define dXSTARG SV * targ = ((PL_op->op_private & OPpENTERSUB_HASTARG) \
234 ? PAD_SV(PL_op->op_targ) : sv_newmortal())
235#endif
236
237#ifndef XSprePUSH
238#define XSprePUSH (sp = PL_stack_base + ax - 1)
239#endif
240
241#ifndef SV_CWD_ISDOT
242#define SV_CWD_ISDOT(dp) \
243 (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
244 (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
245#endif
246
a9939470 247#ifndef getcwd_sv
1955c8df 248/* Taken from perl 5.8's util.c */
09122b95 249#define getcwd_sv(a) Perl_getcwd_sv(aTHX_ a)
5aaab254 250int Perl_getcwd_sv(pTHX_ SV *sv)
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251{
252#ifndef PERL_MICRO
253
254#ifndef INCOMPLETE_TAINTS
255 SvTAINTED_on(sv);
256#endif
257
258#ifdef HAS_GETCWD
259 {
260 char buf[MAXPATHLEN];
261
262 /* Some getcwd()s automatically allocate a buffer of the given
263 * size from the heap if they are given a NULL buffer pointer.
264 * The problem is that this behaviour is not portable. */
265 if (getcwd(buf, sizeof(buf) - 1)) {
266 STRLEN len = strlen(buf);
267 sv_setpvn(sv, buf, len);
268 return TRUE;
269 }
270 else {
271 sv_setsv(sv, &PL_sv_undef);
272 return FALSE;
273 }
274 }
275
276#else
f6342b4b 277 {
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278 Stat_t statbuf;
279 int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
280 int namelen, pathlen=0;
281 DIR *dir;
282 Direntry_t *dp;
283
284 (void)SvUPGRADE(sv, SVt_PV);
285
286 if (PerlLIO_lstat(".", &statbuf) < 0) {
287 SV_CWD_RETURN_UNDEF;
288 }
289
290 orig_cdev = statbuf.st_dev;
291 orig_cino = statbuf.st_ino;
292 cdev = orig_cdev;
293 cino = orig_cino;
294
295 for (;;) {
296 odev = cdev;
297 oino = cino;
298
299 if (PerlDir_chdir("..") < 0) {
300 SV_CWD_RETURN_UNDEF;
301 }
302 if (PerlLIO_stat(".", &statbuf) < 0) {
303 SV_CWD_RETURN_UNDEF;
304 }
305
306 cdev = statbuf.st_dev;
307 cino = statbuf.st_ino;
308
309 if (odev == cdev && oino == cino) {
310 break;
311 }
312 if (!(dir = PerlDir_open("."))) {
313 SV_CWD_RETURN_UNDEF;
314 }
315
316 while ((dp = PerlDir_read(dir)) != NULL) {
317#ifdef DIRNAMLEN
318 namelen = dp->d_namlen;
319#else
320 namelen = strlen(dp->d_name);
321#endif
322 /* skip . and .. */
323 if (SV_CWD_ISDOT(dp)) {
324 continue;
325 }
326
327 if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
328 SV_CWD_RETURN_UNDEF;
329 }
330
331 tdev = statbuf.st_dev;
332 tino = statbuf.st_ino;
333 if (tino == oino && tdev == odev) {
334 break;
335 }
336 }
337
338 if (!dp) {
339 SV_CWD_RETURN_UNDEF;
340 }
341
342 if (pathlen + namelen + 1 >= MAXPATHLEN) {
343 SV_CWD_RETURN_UNDEF;
344 }
345
346 SvGROW(sv, pathlen + namelen + 1);
347
348 if (pathlen) {
349 /* shift down */
350 Move(SvPVX(sv), SvPVX(sv) + namelen + 1, pathlen, char);
351 }
352
353 /* prepend current directory to the front */
354 *SvPVX(sv) = '/';
355 Move(dp->d_name, SvPVX(sv)+1, namelen, char);
356 pathlen += (namelen + 1);
357
358#ifdef VOID_CLOSEDIR
359 PerlDir_close(dir);
360#else
361 if (PerlDir_close(dir) < 0) {
362 SV_CWD_RETURN_UNDEF;
363 }
364#endif
365 }
366
367 if (pathlen) {
368 SvCUR_set(sv, pathlen);
369 *SvEND(sv) = '\0';
370 SvPOK_only(sv);
371
372 if (PerlDir_chdir(SvPVX(sv)) < 0) {
373 SV_CWD_RETURN_UNDEF;
374 }
375 }
376 if (PerlLIO_stat(".", &statbuf) < 0) {
377 SV_CWD_RETURN_UNDEF;
378 }
379
380 cdev = statbuf.st_dev;
381 cino = statbuf.st_ino;
382
383 if (cdev != orig_cdev || cino != orig_cino) {
384 Perl_croak(aTHX_ "Unstable directory path, "
385 "current directory changed unexpectedly");
386 }
387
388 return TRUE;
f6342b4b 389 }
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390#endif
391
392#else
393 return FALSE;
394#endif
395}
396
397#endif
398
399
f22d8e4b 400MODULE = Cwd PACKAGE = Cwd
0d2079fa 401
1d0561d5 402PROTOTYPES: DISABLE
0d2079fa 403
f22d8e4b 404void
23bb49fa 405getcwd(...)
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406ALIAS:
407 fastcwd=1
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408PPCODE:
409{
410 dXSTARG;
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411 /* fastcwd takes zero parameters: */
412 if (ix == 1 && items != 0)
413 croak_xs_usage(cv, "");
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414 getcwd_sv(TARG);
415 XSprePUSH; PUSHTARG;
416#ifndef INCOMPLETE_TAINTS
417 SvTAINTED_on(TARG);
418#endif
419}
420
421void
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422abs_path(pathsv=Nullsv)
423 SV *pathsv
f22d8e4b 424PPCODE:
2ae52c40 425{
f22d8e4b 426 dXSTARG;
66a378bd 427 char *const path = pathsv ? SvPV_nolen(pathsv) : (char *)".";
00536bfc 428 char buf[MAXPATHLEN];
03d70c89 429
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NC
430 if (
431#ifdef VMS
432 Perl_rmsexpand(aTHX_ path, buf, NULL, 0)
433#else
434 bsd_realpath(path, buf)
435#endif
436 ) {
437 sv_setpv_mg(TARG, buf);
00536bfc 438 SvPOK_only(TARG);
ea715489 439 SvTAINTED_on(TARG);
2ae52c40 440 }
03d70c89 441 else
ea715489 442 sv_setsv(TARG, &PL_sv_undef);
2ae52c40 443
66a378bd 444 XSprePUSH; PUSHs(TARG);
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445#ifndef INCOMPLETE_TAINTS
446 SvTAINTED_on(TARG);
447#endif
2ae52c40 448}
09122b95 449
42d1cefd 450#if defined(WIN32) && !defined(UNDER_CE)
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451
452void
453getdcwd(...)
1d0561d5 454PROTOTYPE: ENABLE
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455PPCODE:
456{
457 dXSTARG;
458 int drive;
459 char *dir;
460
461 /* Drive 0 is the current drive, 1 is A:, 2 is B:, 3 is C: and so on. */
462 if ( items == 0 ||
463 (items == 1 && (!SvOK(ST(0)) || (SvPOK(ST(0)) && !SvCUR(ST(0))))))
464 drive = 0;
465 else if (items == 1 && SvPOK(ST(0)) && SvCUR(ST(0)) &&
466 isALPHA(SvPVX(ST(0))[0]))
467 drive = toUPPER(SvPVX(ST(0))[0]) - 'A' + 1;
468 else
469 croak("Usage: getdcwd(DRIVE)");
470
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471 New(0,dir,MAXPATHLEN,char);
472 if (_getdcwd(drive, dir, MAXPATHLEN)) {
66a378bd 473 sv_setpv_mg(TARG, dir);
09122b95
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474 SvPOK_only(TARG);
475 }
476 else
477 sv_setsv(TARG, &PL_sv_undef);
478
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479 Safefree(dir);
480
66a378bd 481 XSprePUSH; PUSHs(TARG);
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482#ifndef INCOMPLETE_TAINTS
483 SvTAINTED_on(TARG);
484#endif
485}
486
487#endif