2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1991, 1993, 1995
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8 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
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14 * documentation and/or other materials provided with the distribution.
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17 * without specific prior written permission.
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32 #include <sys/cdefs.h>
33 __SCCSID("@(#)getcwd.c 8.5 (Berkeley) 2/7/95");
34 __FBSDID("$FreeBSD$");
36 #include "namespace.h"
37 #include <sys/param.h>
47 #include "un-namespace.h"
49 #include "gen-private.h"
52 (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
53 (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
55 extern int __getcwd(char *, size_t);
58 getcwd(char *pt, size_t size)
75 * If no buffer specified by the user, allocate one as necessary.
76 * If a buffer is specified, the size has to be non-zero. The path
77 * is built from the end of the buffer backwards.
91 if ((pt = malloc(ptsize = PATH_MAX)) == NULL)
95 if (__getcwd(pt, ept - pt) == 0) {
98 ept = pt + strlen(pt) - 1;
110 /* Save root values, so know when to stop. */
116 errno = 0; /* XXX readdir has no error return. */
118 for (first = 1;; first = 0) {
119 /* Stat the current level. */
120 if (dir != NULL ? _fstat(_dirfd(dir), &s) : lstat(".", &s))
123 /* Save current node values. */
127 /* Check for reaching root. */
128 if (root_dev == dev && root_ino == ino) {
131 * It's unclear that it's a requirement to copy the
132 * path to the beginning of the buffer, but it's always
133 * been that way and stuff would probably break.
135 bcopy(bpt, pt, ept - bpt);
137 (void) closedir(dir);
141 /* Open and stat parent directory. */
142 fd = _openat(dir != NULL ? _dirfd(dir) : AT_FDCWD,
143 "..", O_RDONLY | O_CLOEXEC);
147 (void) closedir(dir);
148 if (!(dir = fdopendir(fd)) || _fstat(_dirfd(dir), &s)) {
154 * If it's a mount point, have to stat each element because
155 * the inode number in the directory is for the entry in the
156 * parent directory, not the inode number of the mounted file.
159 if (s.st_dev == dev) {
161 if (!(dp = readdir(dir)))
163 if (dp->d_fileno == ino)
168 if (!(dp = readdir(dir)))
173 /* Save the first error for later. */
174 if (fstatat(_dirfd(dir), dp->d_name, &s,
175 AT_SYMLINK_NOFOLLOW)) {
181 if (s.st_dev == dev && s.st_ino == ino)
186 * Check for length of the current name, preceding slash,
189 while (bpt - pt < dp->d_namlen + (first ? 1 : 2)) {
198 if ((pt = reallocf(pt, ptsize *= 2)) == NULL)
202 bcopy(bpt, ept - len, len);
208 bcopy(dp->d_name, bpt, dp->d_namlen);
213 * If readdir set errno, use it, not any saved error; otherwise,
214 * didn't find the current directory in its parent directory, set
218 errno = save_errno ? save_errno : ENOENT;
226 (void) closedir(dir);