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glibc  2.9
getwd.c
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00001 /* Obsolete function to get current working directory.
00002    Copyright (C) 1991, 1992, 1996, 1997, 1998 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <limits.h>
00022 #include <string.h>
00023 #include <unistd.h>
00024 
00025 
00026 char *
00027 getwd (buf)
00028      char *buf;
00029 {
00030 #ifndef PATH_MAX
00031 #define PATH_MAX 1024
00032 #endif
00033   char tmpbuf[PATH_MAX];
00034 
00035   if (buf == NULL)
00036     {
00037       __set_errno (EINVAL);
00038       return NULL;
00039     }
00040 
00041   if (__getcwd (tmpbuf, PATH_MAX) == NULL)
00042     {
00043       /* We use 1024 here since it should really be enough and because
00044         this is a safe value.  */
00045       __strerror_r (errno, buf, 1024);
00046       return NULL;
00047     }
00048 
00049   /* This is completely unsafe.  Nobody can say how big the user
00050      provided buffer is.  Perhaps the application and the libc
00051      disagree about the value of PATH_MAX.  */
00052   return strcpy (buf, tmpbuf);
00053 }
00054 
00055 link_warning (getwd,
00056              "the `getwd' function is dangerous and should not be used.")