1/* xreadlink.c -- readlink wrapper to return the link name in malloc'd storage
2
3 Copyright (C) 2001, 2003-2007, 2009-2019 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
37char *
38xreadlink (char const *filename)
39{
40 char *result = areadlink (filename);
41 if (result == NULL && errno == ENOMEM)
42 xalloc_die ();
43 return result;
44}
45