lib/libc/string/strerror_r.c

   1 /*      $NetBSD: strerror_r.c,v 1.3 2013/08/19 13:03:12 joerg 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 __RCSID("$NetBSD: strerror_r.c,v 1.3 2013/08/19 13:03:12 joerg Exp $");
  34
  35 #include "namespace.h"
  36 #include <assert.h>
  37 #include <errno.h>
  38 #include <stdio.h>
  39 #include <string.h>
  40 #ifdef NLS
  41 #include <limits.h>
  42 #include <nl_types.h>
  43 #define __SETLOCALE_SOURCE__
  44 #include <locale.h>
  45 #include "setlocale_local.h"
  46 #endif
  47
  48 #include "extern.h"
  49
  50 __weak_alias(strerror_r, _strerror_r)
  51
  52 int
  53 _strerror_lr(int num, char *buf, size_t buflen, locale_t loc)
  54 {
  55 #define UPREFIX "Unknown error: %u"
  56         unsigned int errnum = num;
  57         int retval = 0;
  58         size_t slen;
  59 #ifdef NLS
  60         int saved_errno = errno;
  61         nl_catd catd;
  62         catd = catopen_l("libc", NL_CAT_LOCALE, loc);
  63 #endif
  64         _DIAGASSERT(buf != NULL);
  65
  66         if (errnum < (unsigned int) sys_nerr) {
  67 #ifdef NLS
  68                 slen = strlcpy(buf, catgets(catd, 1, (int)errnum,
  69                     sys_errlist[errnum]), buflen);
  70 #else
  71                 slen = strlcpy(buf, sys_errlist[errnum], buflen);
  72 #endif
  73         } else {
  74 #ifdef NLS
  75                 slen = snprintf_l(buf, buflen, loc,
  76                     catgets(catd, 1, 0xffff, UPREFIX), errnum);
  77 #else
  78                 slen = snprintf(buf, buflen, UPREFIX, errnum);
  79 #endif
  80                 retval = EINVAL;
  81         }
  82
  83         if (slen >= buflen)
  84                 retval = ERANGE;
  85
  86 #ifdef NLS
  87         catclose(catd);
  88         errno = saved_errno;
  89 #endif
  90
  91         return retval;
  92 }
  93
  94 int
  95 strerror_r(int num, char *buf, size_t buflen)
  96 {
  97 #ifdef NLS
  98         return _strerror_lr(num, buf, buflen, _current_locale());
  99 #else
 100         return _strerror_lr(num, buf, buflen, NULL);
 101 #endif
 102 }