1 /* Copyright (C) 1991, 92, 93, 94, 95, 96 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
28 /* AIX requires this to be the first thing in the file. */
29 #if defined (_AIX) && !defined (__GNUC__)
38 #include <sys/types.h>
45 #if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
49 #define __set_errno(val) errno = (val)
56 #if defined (USGr3) && !defined (DIRENT)
59 #if defined (Xenix) && !defined (SYSNDIR)
63 #if defined (POSIX) || defined (DIRENT) || defined (__GNU_LIBRARY__)
65 #ifndef __GNU_LIBRARY__
66 #define D_NAMLEN(d) strlen((d)->d_name)
69 #define D_NAMLEN(d) ((d)->d_namlen)
71 #else /* not POSIX or DIRENT */
73 #define D_NAMLEN(d) ((d)->d_namlen)
75 #if defined (USG) && !defined (sgi)
78 #else /* Not SYSNDIR */
84 #endif /* POSIX or DIRENT or __GNU_LIBRARY__ */
86 #if defined (HAVE_UNISTD_H) || defined (__GNU_LIBRARY__)
90 #if (defined (STDC_HEADERS) || defined (__GNU_LIBRARY__) \
95 #else /* No standard headers. */
111 #else /* Not NeXT. */
119 extern void bzero ();
122 extern void bcopy ();
129 extern char *malloc (), *realloc ();
132 #endif /* Standard headers. */
135 #define memcpy(d, s, n) bcopy((s), (d), (n))
136 #define memmove memcpy
137 #endif /* Not ANSI_STRING. */
139 #if !defined(__alloca) && !defined(__GNU_LIBRARY__)
143 #define alloca(n) __builtin_alloca (n)
145 #if defined (sparc) || defined (HAVE_ALLOCA_H)
147 #else /* Not sparc or HAVE_ALLOCA_H. */
149 extern char *alloca ();
150 #endif /* Not _AIX. */
151 #endif /* sparc or HAVE_ALLOCA_H. */
154 #define __alloca alloca
158 #if (defined (HAVE_LIMITS_H) || defined (STDC_HEADERS) || \
159 defined (__GNU_LIBRARY__))
162 #include <sys/param.h>
167 #define PATH_MAX MAXPATHLEN
169 #define PATH_MAX 1024
173 #if !defined (STDC_HEADERS) && !defined (__GNU_LIBRARY__)
175 #define size_t unsigned int
178 #if !__STDC__ && !defined (const)
182 #ifndef __GNU_LIBRARY__
187 #define __getcwd getcwd
190 #if defined HAVE_READDIR_R && !defined _LIBC
191 #define __readdir_r readdir_r
194 /* Get the pathname of the current working directory, and put it in SIZE
195 bytes of BUF. Returns NULL if the directory couldn't be determined or
196 SIZE was too small. If successful, returns BUF. In GNU, if BUF is
197 NULL, an array is allocated with `malloc'; the array is SIZE bytes long,
198 unless SIZE <= 0, in which case it is as big as necessary. */
205 static const char dots[]
206 = "../../../../../../../../../../../../../../../../../../../../../../../\
207 ../../../../../../../../../../../../../../../../../../../../../../../../../../\
208 ../../../../../../../../../../../../../../../../../../../../../../../../../..";
209 const char *dotp, *dotlist;
211 dev_t rootdev, thisdev;
212 ino_t rootino, thisino;
214 register char *pathp;
221 __set_errno (EINVAL);
232 path = malloc (size);
240 if (__lstat (".", &st) < 0)
245 if (__lstat ("/", &st) < 0)
250 dotsize = sizeof (dots) - 1;
251 dotp = &dots[sizeof (dots)];
253 while (!(thisdev == rootdev && thisino == rootino))
255 register DIR *dirstream;
256 register struct dirent *d;
257 #if defined HAVE_READDIR_R || defined _LIBC
258 struct dirent dirbuf;
264 /* Look at the parent directory. */
267 /* My, what a deep directory tree you have, Grandma. */
271 new = malloc (dotsize * 2 + 1);
274 memcpy (new, dots, dotsize);
278 new = realloc ((__ptr_t) dotlist, dotsize * 2 + 1);
282 memcpy (&new[dotsize], new, dotsize);
283 dotp = &new[dotsize];
291 /* Figure out if this directory is a mount point. */
292 if (__lstat (dotp, &st) < 0)
296 mount_point = dotdev != thisdev;
298 /* Search for the last directory. */
299 dirstream = __opendir (dotp);
300 if (dirstream == NULL)
303 #if defined HAVE_READDIR_R || defined _LIBC
304 __readdir_r (dirstream, &dirbuf, &d) >= 0
306 (d = __readdir (dirstream)) != NULL
310 if (d->d_name[0] == '.' &&
311 (d->d_name[1] == '\0' ||
312 (d->d_name[1] == '.' && d->d_name[2] == '\0')))
314 if (mount_point || (ino_t) d->d_ino == thisino)
316 char name[dotlist + dotsize - dotp + 1 + _D_ALLOC_NAMLEN (d)];
317 memcpy (name, dotp, dotlist + dotsize - dotp);
318 name[dotlist + dotsize - dotp] = '/';
319 strcpy (&name[dotlist + dotsize - dotp + 1], d->d_name);
320 if (__lstat (name, &st) < 0)
323 (void) __closedir (dirstream);
327 if (st.st_dev == thisdev && st.st_ino == thisino)
334 (void) __closedir (dirstream);
340 size_t namlen = _D_EXACT_NAMLEN (d);
342 if ((size_t) (pathp - path) < namlen)
346 __set_errno (ERANGE);
352 buf = realloc (path, size);
355 (void) __closedir (dirstream);
357 __set_errno (ENOMEM);/* closedir might have changed it.*/
360 pathp = &buf[pathp - path + size / 2];
362 /* Move current contents up to the end of the buffer.
363 This is guaranteed to be non-overlapping. */
364 memcpy (pathp, pathp - size / 2, path + size - pathp);
368 (void) memcpy (pathp, d->d_name, namlen);
370 (void) __closedir (dirstream);
377 if (pathp == &path[size - 1])
381 free ((__ptr_t) dotlist);
383 memmove (path, pathp, path + size - pathp);
388 free ((__ptr_t) dotlist);
393 weak_alias (__getcwd, getcwd)