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1 | #include "EXTERN.h" |
2 | #include "perl.h" |
3 | #include "XSUB.h" |
4 | |
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5 | /* The realpath() implementation from OpenBSD 2.9 (realpath.c 1.4) |
6 | * Renamed here to bsd_realpath() to avoid library conflicts. |
7 | * --jhi 2000-06-20 */ |
8 | |
9 | /* |
10 | * Copyright (c) 1994 |
11 | * The Regents of the University of California. All rights reserved. |
12 | * |
13 | * This code is derived from software contributed to Berkeley by |
14 | * Jan-Simon Pendry. |
15 | * |
16 | * Redistribution and use in source and binary forms, with or without |
17 | * modification, are permitted provided that the following conditions |
18 | * are met: |
19 | * 1. Redistributions of source code must retain the above copyright |
20 | * notice, this list of conditions and the following disclaimer. |
21 | * 2. Redistributions in binary form must reproduce the above copyright |
22 | * notice, this list of conditions and the following disclaimer in the |
23 | * documentation and/or other materials provided with the distribution. |
24 | * 3. All advertising materials mentioning features or use of this software |
25 | * must display the following acknowledgement: |
26 | * This product includes software developed by the University of |
27 | * California, Berkeley and its contributors. |
28 | * 4. Neither the name of the University nor the names of its contributors |
29 | * may be used to endorse or promote products derived from this software |
30 | * without specific prior written permission. |
31 | * |
32 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
33 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
34 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
35 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
36 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
40 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
41 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
42 | * SUCH DAMAGE. |
43 | */ |
44 | |
45 | #if defined(LIBC_SCCS) && !defined(lint) |
46 | static char *rcsid = "$OpenBSD: realpath.c,v 1.4 1998/05/18 09:55:19 deraadt Exp $"; |
47 | #endif /* LIBC_SCCS and not lint */ |
48 | |
49 | /* OpenBSD system #includes removed since the Perl ones should do. --jhi */ |
50 | |
51 | #ifndef MAXSYMLINKS |
52 | #define MAXSYMLINKS 8 |
53 | #endif |
54 | |
55 | /* |
56 | * char *realpath(const char *path, char resolved_path[MAXPATHLEN]); |
57 | * |
58 | * Find the real name of path, by removing all ".", ".." and symlink |
59 | * components. Returns (resolved) on success, or (NULL) on failure, |
60 | * in which case the path which caused trouble is left in (resolved). |
61 | */ |
62 | static |
63 | char * |
64 | bsd_realpath(path, resolved) |
65 | const char *path; |
66 | char *resolved; |
67 | { |
68 | struct stat sb; |
69 | int fd, n, rootd, serrno; |
70 | char *p, *q, wbuf[MAXPATHLEN]; |
71 | int symlinks = 0; |
72 | |
73 | /* Save the starting point. */ |
74 | if ((fd = open(".", O_RDONLY)) < 0) { |
75 | (void)strcpy(resolved, "."); |
76 | return (NULL); |
77 | } |
78 | |
79 | /* |
80 | * Find the dirname and basename from the path to be resolved. |
81 | * Change directory to the dirname component. |
82 | * lstat the basename part. |
83 | * if it is a symlink, read in the value and loop. |
84 | * if it is a directory, then change to that directory. |
85 | * get the current directory name and append the basename. |
86 | */ |
87 | (void)strncpy(resolved, path, MAXPATHLEN - 1); |
88 | resolved[MAXPATHLEN - 1] = '\0'; |
89 | loop: |
90 | q = strrchr(resolved, '/'); |
91 | if (q != NULL) { |
92 | p = q + 1; |
93 | if (q == resolved) |
94 | q = "/"; |
95 | else { |
96 | do { |
97 | --q; |
98 | } while (q > resolved && *q == '/'); |
99 | q[1] = '\0'; |
100 | q = resolved; |
101 | } |
102 | if (chdir(q) < 0) |
103 | goto err1; |
104 | } else |
105 | p = resolved; |
106 | |
107 | /* Deal with the last component. */ |
108 | if (lstat(p, &sb) == 0) { |
109 | if (S_ISLNK(sb.st_mode)) { |
110 | if (++symlinks > MAXSYMLINKS) { |
111 | errno = ELOOP; |
112 | goto err1; |
113 | } |
114 | n = readlink(p, resolved, MAXPATHLEN-1); |
115 | if (n < 0) |
116 | goto err1; |
117 | resolved[n] = '\0'; |
118 | goto loop; |
119 | } |
120 | if (S_ISDIR(sb.st_mode)) { |
121 | if (chdir(p) < 0) |
122 | goto err1; |
123 | p = ""; |
124 | } |
125 | } |
126 | |
127 | /* |
128 | * Save the last component name and get the full pathname of |
129 | * the current directory. |
130 | */ |
131 | (void)strcpy(wbuf, p); |
132 | if (getcwd(resolved, MAXPATHLEN) == 0) |
133 | goto err1; |
134 | |
135 | /* |
136 | * Join the two strings together, ensuring that the right thing |
137 | * happens if the last component is empty, or the dirname is root. |
138 | */ |
139 | if (resolved[0] == '/' && resolved[1] == '\0') |
140 | rootd = 1; |
141 | else |
142 | rootd = 0; |
143 | |
144 | if (*wbuf) { |
145 | if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) { |
146 | errno = ENAMETOOLONG; |
147 | goto err1; |
148 | } |
149 | if (rootd == 0) |
150 | (void)strcat(resolved, "/"); |
151 | (void)strcat(resolved, wbuf); |
152 | } |
153 | |
154 | /* Go back to where we came from. */ |
155 | if (fchdir(fd) < 0) { |
156 | serrno = errno; |
157 | goto err2; |
158 | } |
159 | |
160 | /* It's okay if the close fails, what's an fd more or less? */ |
161 | (void)close(fd); |
162 | return (resolved); |
163 | |
164 | err1: serrno = errno; |
165 | (void)fchdir(fd); |
166 | err2: (void)close(fd); |
167 | errno = serrno; |
168 | return (NULL); |
169 | } |
170 | |
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171 | MODULE = Cwd PACKAGE = Cwd |
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172 | |
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173 | PROTOTYPES: ENABLE |
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174 | |
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175 | void |
176 | fastcwd() |
177 | PPCODE: |
178 | { |
179 | dXSTARG; |
180 | sv_getcwd(TARG); |
181 | XSprePUSH; PUSHTARG; |
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182 | } |
183 | |
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184 | void |
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185 | abs_path(pathsv=Nullsv) |
186 | SV *pathsv |
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187 | PPCODE: |
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188 | { |
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189 | dXSTARG; |
190 | char *path; |
191 | STRLEN len; |
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192 | char *buf; |
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193 | |
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194 | New(0, buf, MAXPATHLEN, char); |
195 | if (buf) { |
196 | buf[MAXPATHLEN] = 0; |
197 | if (pathsv) |
198 | path = SvPV(pathsv, len); |
199 | else { |
200 | path = "."; |
201 | len = 1; |
202 | } |
203 | |
204 | if (bsd_realpath(path, buf)) { |
205 | sv_setpvn(TARG, buf, strlen(buf)); |
206 | SvPOK_only(TARG); |
207 | } |
208 | else |
209 | sv_setsv(TARG, &PL_sv_undef); |
210 | |
211 | Safefree(buf); |
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212 | } |
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213 | else |
214 | sv_setsv(TARG, &PL_sv_undef); |
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215 | |
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216 | XSprePUSH; PUSHTARG; |
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217 | } |