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glibc  2.9
getdirname.c
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00001 /* Copyright (C) 1992, 1997, 1998, 2000 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <unistd.h>
00020 #include <include/sys/stat.h>
00021 #include <stdlib.h>
00022 #include <string.h>
00023 
00024 /* Return a malloc'd string containing the current directory name.
00025    If the environment variable `PWD' is set, and its value is correct,
00026    that value is used.  */
00027 
00028 char *
00029 get_current_dir_name (void)
00030 {
00031   char *pwd;
00032   struct stat64 dotstat, pwdstat;
00033 
00034   pwd = getenv ("PWD");
00035   if (pwd != NULL
00036       && stat64 (".", &dotstat) == 0
00037       && stat64 (pwd, &pwdstat) == 0
00038       && pwdstat.st_dev == dotstat.st_dev
00039       && pwdstat.st_ino == dotstat.st_ino)
00040     /* The PWD value is correct.  Use it.  */
00041     return __strdup (pwd);
00042 
00043   return __getcwd ((char *) NULL, 0);
00044 }