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[glibc.git] / io / getdirname.c
blobf6c9bfff217342801cd320ddd85a18583b2cf6cd
1 /* Copyright (C) 1992, 1997, 1998 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. */
19 #include <unistd.h>
20 #include <include/sys/stat.h>
21 #include <stdlib.h>
22 #include <string.h>
24 /* Return a malloc'd string containing the current directory name.
25 If the environment variable `PWD' is set, and its value is correct,
26 that value is used. */
28 char *
29 get_current_dir_name (void)
31 char *pwd;
32 struct stat dotstat, pwdstat;
34 pwd = getenv ("PWD");
35 if (pwd != NULL &&
36 stat (".", &dotstat) == 0 &&
37 stat (pwd, &pwdstat) == 0 &&
38 pwdstat.st_dev == dotstat.st_dev &&
39 pwdstat.st_ino == dotstat.st_ino)
40 /* The PWD value is correct. Use it. */
41 return __strdup (pwd);
43 return __getcwd ((char *) NULL, 0);