1 /* Print a message describing error code.
2 Copyright (C) 2008-2012 Free Software Foundation, Inc.
3 Written by Bruno Haible and Simon Josefsson.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program 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
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18 #include <config.h>
19
20 /* Specification. */
21 #include <stdio.h>
22
23 #include <errno.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 #include "strerror-override.h"
28
29 /* Use the system functions, not the gnulib overrides in this file. */
30 #undef fprintf
31
32 void
perror(const char * string)33 perror (const char *string)
34 {
35 char stackbuf[STACKBUF_LEN];
36 int ret;
37
38 /* Our implementation guarantees that this will be a non-empty
39 string, even if it returns EINVAL; and stackbuf should be sized
40 large enough to avoid ERANGE. */
41 ret = strerror_r (errno, stackbuf, sizeof stackbuf);
42 if (ret == ERANGE)
43 abort ();
44
45 if (string != NULL && *string != '\0')
46 fprintf (stderr, "%s: %s\n", string, stackbuf);
47 else
48 fprintf (stderr, "%s\n", stackbuf);
49 }
50