2 * Copyright (c) 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #if !defined(HAVE_GETCWD)
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char rcsid[] = "$OpenBSD: getcwd.c,v 1.9 2003/06/11 21:03:10 deraadt Exp $";
36 #endif /* LIBC_SCCS and not lint */
38 #include <sys/param.h>
49 (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
50 (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
53 getcwd(char *pt, size_t size)
55 register struct dirent *dp;
56 register DIR *dir = NULL;
60 register char *bpt, *bup;
64 size_t ptsize, upsize;
69 * If no buffer specified by the user, allocate one as necessary.
70 * If a buffer is specified, the size has to be non-zero. The path
71 * is built from the end of the buffer backwards.
81 if ((pt = malloc(ptsize = 1024 - 4)) == NULL)
89 * Allocate bytes (1024 - malloc space) for the string of "../"'s.
90 * Should always be enough (it's 340 levels). If it's not, allocate
91 * as necessary. Special * case the first stat, it's ".", not "..".
93 if ((up = malloc(upsize = 1024 - 4)) == NULL)
95 eup = up + MAXPATHLEN;
100 /* Save root values, so know when to stop. */
106 errno = 0; /* XXX readdir has no error return. */
108 for (first = 1;; first = 0) {
109 /* Stat the current level. */
113 /* Save current node values. */
117 /* Check for reaching root. */
118 if (root_dev == dev && root_ino == ino) {
121 * It's unclear that it's a requirement to copy the
122 * path to the beginning of the buffer, but it's always
123 * been that way and stuff would probably break.
125 memmove(pt, bpt, ept - bpt);
131 * Build pointer to the parent directory, allocating memory
132 * as necessary. Max length is 3 for "../", the largest
133 * possible component name, plus a trailing NUL.
135 if (bup + 3 + MAXNAMLEN + 1 >= eup) {
138 if ((nup = realloc(up, upsize *= 2)) == NULL)
148 /* Open and stat parent directory.
149 * RACE?? - replaced fstat(dirfd(dir), &s) w/ lstat(up,&s)
151 if (!(dir = opendir(up)) || lstat(up,&s))
154 /* Add trailing slash for next directory. */
158 * If it's a mount point, have to stat each element because
159 * the inode number in the directory is for the entry in the
160 * parent directory, not the inode number of the mounted file.
163 if (s.st_dev == dev) {
165 if (!(dp = readdir(dir)))
167 if (dp->d_fileno == ino)
172 if (!(dp = readdir(dir)))
176 memmove(bup, dp->d_name, dp->d_namlen + 1);
178 /* Save the first error for later. */
185 if (s.st_dev == dev && s.st_ino == ino)
190 * Check for length of the current name, preceding slash,
193 if (bpt - pt < dp->d_namlen + (first ? 1 : 2)) {
203 if ((npt = realloc(pt, ptsize *= 2)) == NULL)
208 memmove(ept - len, bpt, len);
214 memmove(bpt, dp->d_name, dp->d_namlen);
217 /* Truncate any file name. */
223 * If readdir set errno, use it, not any saved error; otherwise,
224 * didn't find the current directory in its parent directory, set
228 errno = save_errno ? save_errno : ENOENT;
240 #endif /* !defined(HAVE_GETCWD) */