external/bsd/bind/dist/contrib/nslint-3.0a2/strerror.c

   1 /*      $NetBSD: strerror.c,v 1.1.1.3 2014/12/10 03:34:34 christos Exp $        */
   2
   3 /*
   4  * Copyright (c) 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 static const char sccsid[] = "@(#)strerror.c    8.1 (Berkeley) 6/4/93";
  34 #endif /* LIBC_SCCS and not lint */
  35
  36 #include <sys/types.h>
  37
  38 #include <string.h>
  39
  40 #include "gnuc.h"
  41 #ifdef HAVE_OS_PROTO_H
  42 #include "os-proto.h"
  43 #endif
  44
  45 char *
  46 strerror(num)
  47         int num;
  48 {
  49         extern int sys_nerr;
  50         extern char *sys_errlist[];
  51 #define UPREFIX "Unknown error: "
  52         static char ebuf[40] = UPREFIX;         /* 64-bit number + slop */
  53         register unsigned int errnum;
  54         register char *p, *t;
  55         char tmp[40];
  56
  57         errnum = num;                           /* convert to unsigned */
  58         if (errnum < sys_nerr)
  59                 return(sys_errlist[errnum]);
  60
  61         /* Do this by hand, so we don't include stdio(3). */
  62         t = tmp;
  63         do {
  64                 *t++ = "0123456789"[errnum % 10];
  65         } while (errnum /= 10);
  66         for (p = ebuf + sizeof(UPREFIX) - 1;;) {
  67                 *p++ = *--t;
  68                 if (t <= tmp)
  69                         break;
  70         }
  71         *p = '\0';
  72         return(ebuf);
  73 }