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/* xreadlinkat.c -- readlink wrapper to return the link name in malloc'd storage
Copyright (C) 2001, 2003-2007, 2009-2019 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Jim Meyering <jim@meyering.net>,
and Bruno Haible <bruno@clisp.org>,
and Eric Blake <ebb9@byu.net>. */
#include <config.h>
/* Specification. */
#include "xreadlink.h"
#include <errno.h>
#include "areadlink.h"
#include "xalloc.h"
/* Call readlinkat to get the symbolic link value of FILENAME relative to FD.
Return a pointer to that NUL-terminated string in malloc'd storage.
If readlinkat fails, return NULL and set errno (although failure to
change directory will issue a diagnostic and exit).
If realloc fails, or if the link value is longer than SIZE_MAX :-),
give a diagnostic and exit. */
char *
xreadlinkat (int fd, char const *filename)
{
char *result = areadlinkat (fd, filename);
if (result == NULL && errno == ENOMEM)
xalloc_die ();
return result;
}
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