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 | |
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 | } |
45 | |