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