1 /*
2 * fstrcmp - fuzzy string compare library
3 * Copyright (C) 2009 Peter Miller
4 * Written by Peter Miller <pmiller@opensource.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or (at
9 * your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include <lib/ac/stddef.h>
21 #include <lib/ac/stdlib.h>
22 #include <lib/ac/string.h>
23 #include <lib/ac/stdio.h>
24
25 #include <lib/gcc_attributes.h>
26
27
28 /*
29 * NAME
30 * strerror - string for error number
31 *
32 * SYNOPSIS
33 * char *strerror(int errnum);
34 *
35 * DESCRIPTION
36 * The strerror function maps the error number in errnum to an error
37 * message string.
38 *
39 * RETURNS
40 * The strerror function returns a pointer to the string, the contents of
41 * which are implementation-defined. The array pointed to shall not be
42 * modified by the program, but may be overwritten by a subsequent call to
43 * the strerror function.
44 *
45 * CAVEAT
46 * Unknown errors will be rendered in the form "Error %d", where %d will
47 * be replaced by a decimal representation of the error number.
48 */
49
50 #ifndef HAVE_STRERROR
51
52 LINKAGE_HIDDEN
53 char *
strerror(int n)54 strerror(int n)
55 {
56 extern int sys_nerr;
57 extern char *sys_errlist[];
58 static char buffer[16];
59
60 if (n < 1 || n > sys_nerr)
61 {
62 sprintf(buffer, "Error %d", n);
63 return buffer;
64 }
65 return sys_errlist[n];
66 }
67
68 #endif /* !HAVE_STRERROR */
69