2 * Copyright (c) 1989, 1991, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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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.
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * $FreeBSD: src/lib/libc/gen/getcwd.c,v 1.18 1999/09/28 13:24:13 marcel Exp $
34 * $DragonFly: src/lib/libc/gen/getcwd.c,v 1.4 2005/01/31 22:29:15 dillon Exp $
36 * @(#)getcwd.c 8.5 (Berkeley) 2/7/95
39 #include "namespace.h"
40 #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 static int have__getcwd = 1; /* 0 = no, 1 = perhaps, 2 = yes */
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 = 1024 - 4)) == NULL)
98 #if defined(__NETBSD_SYSCALLS)
102 struct sigaction sa, osa;
103 int sigsys_installed = 0;
106 if (have__getcwd == 1) { /* unsure? */
107 sigemptyset(&sa.sa_mask);
109 sa.sa_handler = SIG_IGN;
110 if (sigaction(SIGSYS, &sa, &osa) >= 0)
111 sigsys_installed = 1;
113 ret = __getcwd(pt, ept - pt);
114 if (sigsys_installed == 1) {
116 sigaction(SIGSYS, &osa, NULL);
119 /* XXX a bogus syscall seems to return EINVAL(!) */
120 if (ret < 0 && (errno == ENOSYS || errno == EINVAL))
122 else if (have__getcwd == 1)
123 have__getcwd = 2; /* yep, remember we have it */
127 ept = pt + strlen(pt) - 1;
142 * Allocate bytes (1024 - malloc space) for the string of "../"'s.
143 * Should always be enough (it's 340 levels). If it's not, allocate
144 * as necessary. Special case the first stat, it's ".", not "..".
146 if ((up = malloc(upsize = 1024 - 4)) == NULL)
148 eup = up + MAXPATHLEN;
153 /* Save root values, so know when to stop. */
159 errno = 0; /* XXX readdir has no error return. */
161 for (first = 1;; first = 0) {
162 /* Stat the current level. */
166 /* Save current node values. */
170 /* Check for reaching root. */
171 if (root_dev == dev && root_ino == ino) {
174 * It's unclear that it's a requirement to copy the
175 * path to the beginning of the buffer, but it's always
176 * been that way and stuff would probably break.
178 bcopy(bpt, pt, ept - bpt);
184 * Build pointer to the parent directory, allocating memory
185 * as necessary. Max length is 3 for "../", the largest
186 * possible component name, plus a trailing NULL.
188 if (bup + 3 + MAXNAMLEN + 1 >= eup) {
189 if ((up = reallocf(up, upsize *= 2)) == NULL)
198 /* Open and stat parent directory. */
199 if (!(dir = opendir(up)) || _fstat(dirfd(dir), &s))
202 /* Add trailing slash for next directory. */
207 * If it's a mount point, have to stat each element because
208 * the inode number in the directory is for the entry in the
209 * parent directory, not the inode number of the mounted file.
212 if (s.st_dev == dev) {
214 if (!(dp = readdir(dir)))
216 if (dp->d_fileno == ino)
221 if (!(dp = readdir(dir)))
225 bcopy(dp->d_name, bup, dp->d_namlen + 1);
227 /* Save the first error for later. */
234 if (s.st_dev == dev && s.st_ino == ino)
239 * Check for length of the current name, preceding slash,
242 if (bpt - pt < dp->d_namlen + (first ? 1 : 2)) {
251 if ((pt = realloc(pt, ptsize *= 2)) == NULL)
255 bcopy(bpt, ept - len, len);
261 bcopy(dp->d_name, bpt, dp->d_namlen);
262 (void) closedir(dir);
265 /* Truncate any file name. */
271 * If readdir set errno, use it, not any saved error; otherwise,
272 * didn't find the current directory in its parent directory, set
276 errno = save_errno ? save_errno : ENOENT;
284 (void) closedir(dir);