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0d2079fa BS |
1 | #include "EXTERN.h" |
2 | #include "perl.h" | |
3 | #include "XSUB.h" | |
4 | ||
c70498c1 JH |
5 | #ifdef I_UNISTD |
6 | # include <unistd.h> | |
7 | #endif | |
8 | ||
03d70c89 JH |
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 CL |
73 | dTHX; |
74 | return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0); | |
e3d944f4 | 75 | #else |
03d70c89 | 76 | struct stat sb; |
bae06e14 | 77 | int n, rootd, serrno; |
03d70c89 JH |
78 | char *p, *q, wbuf[MAXPATHLEN]; |
79 | int symlinks = 0; | |
80 | ||
81 | /* Save the starting point. */ | |
e3d944f4 | 82 | #ifdef HAS_FCHDIR |
bae06e14 JH |
83 | int fd; |
84 | ||
03d70c89 JH |
85 | if ((fd = open(".", O_RDONLY)) < 0) { |
86 | (void)strcpy(resolved, "."); | |
87 | return (NULL); | |
88 | } | |
e3d944f4 JH |
89 | #else |
90 | char wd[MAXPATHLEN]; | |
91 | ||
92 | if (getcwd(wd, MAXPATHLEN - 1) == NULL) { | |
93 | (void)strcpy(resolved, "."); | |
94 | return (NULL); | |
95 | } | |
96 | #endif | |
03d70c89 JH |
97 | |
98 | /* | |
99 | * Find the dirname and basename from the path to be resolved. | |
100 | * Change directory to the dirname component. | |
101 | * lstat the basename part. | |
102 | * if it is a symlink, read in the value and loop. | |
103 | * if it is a directory, then change to that directory. | |
104 | * get the current directory name and append the basename. | |
105 | */ | |
106 | (void)strncpy(resolved, path, MAXPATHLEN - 1); | |
107 | resolved[MAXPATHLEN - 1] = '\0'; | |
108 | loop: | |
109 | q = strrchr(resolved, '/'); | |
110 | if (q != NULL) { | |
111 | p = q + 1; | |
112 | if (q == resolved) | |
113 | q = "/"; | |
114 | else { | |
115 | do { | |
116 | --q; | |
117 | } while (q > resolved && *q == '/'); | |
118 | q[1] = '\0'; | |
119 | q = resolved; | |
120 | } | |
121 | if (chdir(q) < 0) | |
122 | goto err1; | |
123 | } else | |
124 | p = resolved; | |
125 | ||
bae06e14 | 126 | #if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK) |
03d70c89 JH |
127 | /* Deal with the last component. */ |
128 | if (lstat(p, &sb) == 0) { | |
129 | if (S_ISLNK(sb.st_mode)) { | |
130 | if (++symlinks > MAXSYMLINKS) { | |
131 | errno = ELOOP; | |
132 | goto err1; | |
133 | } | |
134 | n = readlink(p, resolved, MAXPATHLEN-1); | |
135 | if (n < 0) | |
136 | goto err1; | |
137 | resolved[n] = '\0'; | |
138 | goto loop; | |
139 | } | |
140 | if (S_ISDIR(sb.st_mode)) { | |
141 | if (chdir(p) < 0) | |
142 | goto err1; | |
143 | p = ""; | |
144 | } | |
145 | } | |
e3d944f4 | 146 | #endif |
03d70c89 JH |
147 | |
148 | /* | |
149 | * Save the last component name and get the full pathname of | |
150 | * the current directory. | |
151 | */ | |
152 | (void)strcpy(wbuf, p); | |
153 | if (getcwd(resolved, MAXPATHLEN) == 0) | |
154 | goto err1; | |
155 | ||
156 | /* | |
157 | * Join the two strings together, ensuring that the right thing | |
158 | * happens if the last component is empty, or the dirname is root. | |
159 | */ | |
160 | if (resolved[0] == '/' && resolved[1] == '\0') | |
161 | rootd = 1; | |
162 | else | |
163 | rootd = 0; | |
164 | ||
165 | if (*wbuf) { | |
166 | if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) { | |
167 | errno = ENAMETOOLONG; | |
168 | goto err1; | |
169 | } | |
170 | if (rootd == 0) | |
171 | (void)strcat(resolved, "/"); | |
172 | (void)strcat(resolved, wbuf); | |
173 | } | |
174 | ||
175 | /* Go back to where we came from. */ | |
e3d944f4 | 176 | #ifdef HAS_FCHDIR |
03d70c89 JH |
177 | if (fchdir(fd) < 0) { |
178 | serrno = errno; | |
179 | goto err2; | |
180 | } | |
e3d944f4 JH |
181 | #else |
182 | if (chdir(wd) < 0) { | |
183 | serrno = errno; | |
184 | goto err2; | |
185 | } | |
186 | #endif | |
03d70c89 JH |
187 | |
188 | /* It's okay if the close fails, what's an fd more or less? */ | |
9cad6237 | 189 | #ifdef HAS_FCHDIR |
03d70c89 | 190 | (void)close(fd); |
9cad6237 | 191 | #endif |
03d70c89 JH |
192 | return (resolved); |
193 | ||
194 | err1: serrno = errno; | |
29ab7413 | 195 | #ifdef HAS_FCHDIR |
03d70c89 | 196 | (void)fchdir(fd); |
29ab7413 JH |
197 | #else |
198 | (void)chdir(wd); | |
199 | #endif | |
89423764 GS |
200 | |
201 | err2: | |
202 | #ifdef HAS_FCHDIR | |
203 | (void)close(fd); | |
204 | #endif | |
03d70c89 JH |
205 | errno = serrno; |
206 | return (NULL); | |
e3d944f4 | 207 | #endif |
03d70c89 JH |
208 | } |
209 | ||
f22d8e4b | 210 | MODULE = Cwd PACKAGE = Cwd |
0d2079fa | 211 | |
f22d8e4b | 212 | PROTOTYPES: ENABLE |
0d2079fa | 213 | |
f22d8e4b DM |
214 | void |
215 | fastcwd() | |
216 | PPCODE: | |
217 | { | |
218 | dXSTARG; | |
89423764 | 219 | getcwd_sv(TARG); |
f22d8e4b | 220 | XSprePUSH; PUSHTARG; |
0d2079fa BS |
221 | } |
222 | ||
f22d8e4b | 223 | void |
03d70c89 JH |
224 | abs_path(pathsv=Nullsv) |
225 | SV *pathsv | |
f22d8e4b | 226 | PPCODE: |
2ae52c40 | 227 | { |
f22d8e4b DM |
228 | dXSTARG; |
229 | char *path; | |
00536bfc | 230 | char buf[MAXPATHLEN]; |
03d70c89 | 231 | |
ea715489 | 232 | path = pathsv ? SvPV_nolen(pathsv) : "."; |
03d70c89 | 233 | |
00536bfc JH |
234 | if (bsd_realpath(path, buf)) { |
235 | sv_setpvn(TARG, buf, strlen(buf)); | |
236 | SvPOK_only(TARG); | |
ea715489 | 237 | SvTAINTED_on(TARG); |
2ae52c40 | 238 | } |
03d70c89 | 239 | else |
ea715489 | 240 | sv_setsv(TARG, &PL_sv_undef); |
2ae52c40 | 241 | |
f22d8e4b | 242 | XSprePUSH; PUSHTARG; |
ea715489 JH |
243 | #ifndef INCOMPLETE_TAINTS |
244 | SvTAINTED_on(TARG); | |
245 | #endif | |
2ae52c40 | 246 | } |