1  /* xreadlink.c -- readlink wrapper to return the link name in malloc'd storage
       2  
       3     Copyright (C) 2001, 2003-2007, 2009-2023 Free Software Foundation, Inc.
       4  
       5     This program is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU General Public License as published by
       7     the Free Software Foundation, either version 3 of the License, or
       8     (at your option) any later version.
       9  
      10     This program 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
      13     GNU General Public License for more details.
      14  
      15     You should have received a copy of the GNU General Public License
      16     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  /* Written by Jim Meyering <jim@meyering.net>
      19     and Bruno Haible <bruno@clisp.org>.  */
      20  
      21  #include <config.h>
      22  
      23  /* Specification.  */
      24  #include "xreadlink.h"
      25  
      26  #include <errno.h>
      27  
      28  #include "areadlink.h"
      29  #include "xalloc.h"
      30  
      31  /* Call readlink to get the symbolic link value of FILENAME.
      32     Return a pointer to that NUL-terminated string in malloc'd storage.
      33     If readlink fails, return NULL and set errno.
      34     If realloc fails, or if the link value is longer than SIZE_MAX :-),
      35     give a diagnostic and exit.  */
      36  
      37  char *
      38  xreadlink (char const *filename)
      39  {
      40    char *result = areadlink (filename);
      41    if (result == NULL && errno == ENOMEM)
      42      xalloc_die ();
      43    return result;
      44  }