1 #if defined(LIBC_SCCS) && !defined(lint)
2 static const char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93";
3 static const char rcsid[] = "$Id: strerror.c,v 1.6 2008/02/18 03:49:08 marka Exp $";
4 #endif /* LIBC_SCCS and not lint */
5
6 /*
7 * Copyright (c) 1988, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 #include "port_before.h"
40
41 #include <sys/param.h>
42 #include <sys/types.h>
43
44 #include <string.h>
45
46 #include "port_after.h"
47
48 #ifndef NEED_STRERROR
49 int __strerror_unneeded__;
50 #else
51
52 #ifdef USE_SYSERROR_LIST
53 extern int sys_nerr;
54 extern char *sys_errlist[];
55 #endif
56
57 const char *
isc_strerror(int num)58 isc_strerror(int num) {
59 #define UPREFIX "Unknown error: "
60 static char ebuf[40] = UPREFIX; /*%< 64-bit number + slop */
61 u_int errnum;
62 char *p, *t;
63 #ifndef USE_SYSERROR_LIST
64 const char *ret;
65 #endif
66 char tmp[40];
67
68 errnum = num; /*%< convert to unsigned */
69 #ifdef USE_SYSERROR_LIST
70 if (errnum < (u_int)sys_nerr)
71 return (sys_errlist[errnum]);
72 #else
73 #undef strerror
74 ret = strerror(num); /*%< call strerror() in libc */
75 if (ret != NULL)
76 return(ret);
77 #endif
78
79 /* Do this by hand, so we don't include stdio(3). */
80 t = tmp;
81 do {
82 *t++ = "0123456789"[errnum % 10];
83 } while (errnum /= 10);
84 for (p = ebuf + sizeof(UPREFIX) - 1;;) {
85 *p++ = *--t;
86 if (t <= tmp)
87 break;
88 }
89 return (ebuf);
90 }
91
92 #endif /*NEED_STRERROR*/
93
94 /*! \file */
95