2 * Copyright (c) 1989, 1991, 1993, 1995
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)getcwd.c 8.5 (Berkeley) 2/7/95";
36 #endif /* LIBC_SCCS and not lint */
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include "namespace.h"
41 #include <sys/param.h>
51 #include "un-namespace.h"
54 (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
55 (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
57 extern int __getcwd(char *, size_t);
73 size_t ptsize, upsize;
75 char *ept, *eup, *up, c;
78 * If no buffer specified by the user, allocate one as necessary.
79 * If a buffer is specified, the size has to be non-zero. The path
80 * is built from the end of the buffer backwards.
94 if ((pt = malloc(ptsize = PATH_MAX)) == NULL)
98 if (__getcwd(pt, ept - pt) == 0) {
101 ept = pt + strlen(pt) - 1;
114 * Allocate 1024 bytes for the string of "../"'s.
115 * Should always be enough. If it's not, allocate
116 * as necessary. Special case the first stat, it's ".", not "..".
118 if ((up = malloc(upsize = 1024)) == NULL)
125 /* Save root values, so know when to stop. */
131 errno = 0; /* XXX readdir has no error return. */
133 for (first = 1;; first = 0) {
134 /* Stat the current level. */
138 /* Save current node values. */
142 /* Check for reaching root. */
143 if (root_dev == dev && root_ino == ino) {
146 * It's unclear that it's a requirement to copy the
147 * path to the beginning of the buffer, but it's always
148 * been that way and stuff would probably break.
150 bcopy(bpt, pt, ept - bpt);
156 * Build pointer to the parent directory, allocating memory
157 * as necessary. Max length is 3 for "../", the largest
158 * possible component name, plus a trailing NUL.
160 while (bup + 3 + MAXNAMLEN + 1 >= eup) {
161 if ((up = reallocf(up, upsize *= 2)) == NULL)
170 /* Open and stat parent directory. */
171 if (!(dir = opendir(up)) || _fstat(dirfd(dir), &s))
174 /* Add trailing slash for next directory. */
179 * If it's a mount point, have to stat each element because
180 * the inode number in the directory is for the entry in the
181 * parent directory, not the inode number of the mounted file.
184 if (s.st_dev == dev) {
186 if (!(dp = readdir(dir)))
188 if (dp->d_fileno == ino)
193 if (!(dp = readdir(dir)))
197 bcopy(dp->d_name, bup, dp->d_namlen + 1);
199 /* Save the first error for later. */
206 if (s.st_dev == dev && s.st_ino == ino)
211 * Check for length of the current name, preceding slash,
214 while (bpt - pt < dp->d_namlen + (first ? 1 : 2)) {
223 if ((pt = reallocf(pt, ptsize *= 2)) == NULL)
227 bcopy(bpt, ept - len, len);
233 bcopy(dp->d_name, bpt, dp->d_namlen);
234 (void) closedir(dir);
237 /* Truncate any file name. */
243 * If readdir set errno, use it, not any saved error; otherwise,
244 * didn't find the current directory in its parent directory, set
248 errno = save_errno ? save_errno : ENOENT;
256 (void) closedir(dir);