1/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18#include <libintl.h>
19#include <stdio.h>
20#include <string.h>
21#include <errno.h>
22
23/* Return a string describing the errno code in ERRNUM.
24 The storage is good only until the next call to strerror.
25 Writing to the storage causes undefined behavior. */
26libc_freeres_ptr (static char *buf);
27
28char *
29strerror (int errnum)
30{
31 char *ret = __strerror_r (errnum, NULL, 0);
32 int saved_errno;
33
34 if (__glibc_likely (ret != NULL))
35 return ret;
36 saved_errno = errno;
37 if (buf == NULL)
38 buf = malloc (1024);
39 __set_errno (saved_errno);
40 if (buf == NULL)
41 return _("Unknown error");
42 return __strerror_r (errnum, buf, 1024);
43}
44