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Remove Win32 compiler warnings
[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
f22d8e4b 213MODULE = Cwd PACKAGE = Cwd
0d2079fa 214
f22d8e4b 215PROTOTYPES: ENABLE
0d2079fa 216
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217void
218fastcwd()
7ddb28a3 219PROTOTYPE: DISABLE
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220PPCODE:
221{
222 dXSTARG;
89423764 223 getcwd_sv(TARG);
f22d8e4b 224 XSprePUSH; PUSHTARG;
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225#ifndef INCOMPLETE_TAINTS
226 SvTAINTED_on(TARG);
227#endif
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228}
229
f22d8e4b 230void
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231abs_path(pathsv=Nullsv)
232 SV *pathsv
f22d8e4b 233PPCODE:
2ae52c40 234{
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235 dXSTARG;
236 char *path;
00536bfc 237 char buf[MAXPATHLEN];
03d70c89 238
ea715489 239 path = pathsv ? SvPV_nolen(pathsv) : ".";
03d70c89 240
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241 if (bsd_realpath(path, buf)) {
242 sv_setpvn(TARG, buf, strlen(buf));
243 SvPOK_only(TARG);
ea715489 244 SvTAINTED_on(TARG);
2ae52c40 245 }
03d70c89 246 else
ea715489 247 sv_setsv(TARG, &PL_sv_undef);
2ae52c40 248
f22d8e4b 249 XSprePUSH; PUSHTARG;
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250#ifndef INCOMPLETE_TAINTS
251 SvTAINTED_on(TARG);
252#endif
2ae52c40 253}