io/getwd.c

   1 /* Obsolete function to get current working directory.
   2    Copyright (C) 1991, 1992, 1996, 1997, 1998 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25
  26 char *
  27 getwd (buf)
  28      char *buf;
  29 {
  30 #ifndef PATH_MAX
  31 #define PATH_MAX 1024
  32 #endif
  33   char tmpbuf[PATH_MAX];
  34
  35   if (buf == NULL)
  36     {
  37       __set_errno (EINVAL);
  38       return NULL;
  39     }
  40
  41   if (__getcwd (tmpbuf, PATH_MAX) == NULL)
  42     {
  43       /* We use 1024 here since it should really be enough and because
  44          this is a safe value.  */
  45       __strerror_r (errno, buf, 1024);
  46       return NULL;
  47     }
  48
  49   /* This is completely unsafe.  Nobody can say how big the user
  50      provided buffer is.  Perhaps the application and the libc
  51      disagree about the value of PATH_MAX.  */
  52   return strcpy (buf, tmpbuf);
  53 }
  54
  55 link_warning (getwd,
  56               "the `getwd' function is dangerous and should not be used.")