contrib/bind-9.5.2/lib/bind/bsd/strerror.c

   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 1.5.672.1 2008/02/18 04:10:16 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 *
  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 */