1  /* Obsolete function to get current working directory.
       2     Copyright (C) 1991-2023 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, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <errno.h>
      20  #include <limits.h>
      21  #include <string.h>
      22  #include <unistd.h>
      23  
      24  
      25  char *
      26  getwd (char *buf)
      27  {
      28  #ifndef PATH_MAX
      29  #define PATH_MAX 1024
      30  #endif
      31    char tmpbuf[PATH_MAX];
      32  
      33    if (buf == NULL)
      34      {
      35        __set_errno (EINVAL);
      36        return NULL;
      37      }
      38  
      39    if (__getcwd (tmpbuf, PATH_MAX) == NULL)
      40      {
      41        /* We use 1024 here since it should really be enough and because
      42  	 this is a safe value.  */
      43        __strerror_r (errno, buf, 1024);
      44        return NULL;
      45      }
      46  
      47    /* This is completely unsafe.  Nobody can say how big the user
      48       provided buffer is.  Perhaps the application and the libc
      49       disagree about the value of PATH_MAX.  */
      50    return strcpy (buf, tmpbuf);
      51  }
      52  
      53  link_warning (getwd,
      54  	      "the `getwd' function is dangerous and should not be used.")