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1ffe1ccb | 1 | /* Error-checking, allocating wrapper for readlink. |
04277e02 | 2 | Copyright (C) 2017-2019 Free Software Foundation, Inc. |
1ffe1ccb FW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
1ffe1ccb FW |
18 | |
19 | #include <scratch_buffer.h> | |
20 | #include <support/check.h> | |
21 | #include <support/support.h> | |
22 | #include <xunistd.h> | |
23 | ||
24 | char * | |
25 | xreadlink (const char *path) | |
26 | { | |
27 | struct scratch_buffer buf; | |
28 | scratch_buffer_init (&buf); | |
29 | ||
30 | while (true) | |
31 | { | |
32 | ssize_t count = readlink (path, buf.data, buf.length); | |
33 | if (count < 0) | |
34 | FAIL_EXIT1 ("readlink (\"%s\"): %m", path); | |
35 | if (count < buf.length) | |
36 | { | |
37 | char *result = xstrndup (buf.data, count); | |
38 | scratch_buffer_free (&buf); | |
39 | return result; | |
40 | } | |
41 | if (!scratch_buffer_grow (&buf)) | |
42 | FAIL_EXIT1 ("scratch_buffer_grow in xreadlink"); | |
43 | } | |
44 | } |