1/* Copyright (C) 2007-2017 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 <locale.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <sys/param.h>
24
25
26static __thread char *last_value;
27
28
29static const char *
30translate (const char *str, locale_t loc)
31{
32 locale_t oldloc = __uselocale (loc);
33 const char *res = _(str);
34 __uselocale (oldloc);
35 return res;
36}
37
38
39/* Return a string describing the errno code in ERRNUM. */
40char *
41strerror_l (int errnum, locale_t loc)
42{
43
44
45 if (__builtin_expect (errnum < 0 || errnum >= _sys_nerr_internal
46 || _sys_errlist_internal[errnum] == NULL, 0))
47 {
48 free (last_value);
49 if (__asprintf (&last_value, "%s%d",
50 translate ("Unknown error ", loc), errnum) == -1)
51 last_value = NULL;
52
53 return last_value;
54 }
55
56 return (char *) translate (_sys_errlist_internal[errnum], loc);
57}
58
59
60#ifdef _LIBC
61# ifdef _LIBC_REENTRANT
62/* This is called when a thread is exiting to free the last_value string. */
63static void __attribute__ ((section ("__libc_thread_freeres_fn")))
64strerror_thread_freeres (void)
65{
66 free (last_value);
67}
68text_set_element (__libc_thread_subfreeres, strerror_thread_freeres);
69text_set_element (__libc_subfreeres, strerror_thread_freeres);
70# endif
71#endif
72