lib/libc/string/strerror_r.c

   1 /*      $NetBSD: strerror_r.c,v 1.2 2005/07/30 15:21:21 christos Exp $  */
   2
   3 /*
   4  * Copyright (c) 1988 Regents of the University of California.
   5  * 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 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char *sccsid = "@(#)strerror.c   5.6 (Berkeley) 5/4/91";
  36 #else
  37 __RCSID("$NetBSD: strerror_r.c,v 1.2 2005/07/30 15:21:21 christos Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include "namespace.h"
  42 #ifdef NLS
  43 #include <limits.h>
  44 #include <nl_types.h>
  45 #endif
  46
  47 #include <assert.h>
  48 #include <errno.h>
  49 #include <stdio.h>
  50 #include <string.h>
  51 #include "extern.h"
  52
  53 #ifdef _LIBC
  54 # ifdef __weak_alias
  55 __weak_alias(strerror_r, _strerror_r)
  56 # endif
  57 #endif
  58
  59 int
  60 #ifdef _LIBC
  61 _strerror_r(int num, char *buf, size_t buflen)
  62 #else
  63 strerror_r(int num, char *buf, size_t buflen)
  64 #endif
  65 {
  66 #define UPREFIX "Unknown error: %u"
  67         unsigned int errnum = num;
  68         int retval = 0;
  69         size_t slen;
  70 #ifdef NLS
  71         int saved_errno = errno;
  72         nl_catd catd;
  73         catd = catopen("libc", NL_CAT_LOCALE);
  74 #endif
  75         _DIAGASSERT(buf != NULL);
  76
  77         if (errnum < (unsigned int) sys_nerr) {
  78 #ifdef NLS
  79                 slen = strlcpy(buf, catgets(catd, 1, (int)errnum,
  80                     sys_errlist[errnum]), buflen);
  81 #else
  82                 slen = strlcpy(buf, sys_errlist[errnum], buflen);
  83 #endif
  84         } else {
  85 #ifdef NLS
  86                 slen = snprintf(buf, buflen,
  87                     catgets(catd, 1, 0xffff, UPREFIX), errnum);
  88 #else
  89                 slen = snprintf(buf, buflen, UPREFIX, errnum);
  90 #endif
  91                 retval = EINVAL;
  92         }
  93
  94         if (slen >= buflen)
  95                 retval = ERANGE;
  96
  97 #ifdef NLS
  98         catclose(catd);
  99         errno = saved_errno;
 100 #endif
 101
 102         return retval;
 103 }