45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/* Error-checking, allocating wrapper for readlink.
|
|
Copyright (C) 2017-2022 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <scratch_buffer.h>
|
|
#include <support/check.h>
|
|
#include <support/support.h>
|
|
#include <xunistd.h>
|
|
|
|
char *
|
|
xreadlink (const char *path)
|
|
{
|
|
struct scratch_buffer buf;
|
|
scratch_buffer_init (&buf);
|
|
|
|
while (true)
|
|
{
|
|
ssize_t count = readlink (path, buf.data, buf.length);
|
|
if (count < 0)
|
|
FAIL_EXIT1 ("readlink (\"%s\"): %m", path);
|
|
if (count < buf.length)
|
|
{
|
|
char *result = xstrndup (buf.data, count);
|
|
scratch_buffer_free (&buf);
|
|
return result;
|
|
}
|
|
if (!scratch_buffer_grow (&buf))
|
|
FAIL_EXIT1 ("scratch_buffer_grow in xreadlink");
|
|
}
|
|
}
|