lib/xreadlink.c

   1 /* xreadlink.c -- readlink wrapper to return the link name in malloc'd storage
   2
   3    Copyright (C) 2001, 2003-2007, 2009-2017 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 <http://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 }