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strerror_r.c revision 1.4 
      1 /*	$NetBSD: strerror_r.c,v 1.4 2017/01/10 20:25:48 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 __RCSID("$NetBSD: strerror_r.c,v 1.4 2017/01/10 20:25:48 christos Exp $");
     34 
     35 #include "namespace.h"
     36 #include <assert.h>
     37 #include <errno.h>
     38 #include <stdio.h>
     39 #include <string.h>
     40 #include <stdio.h>	/* for sys_nerr on FreeBSD */
     41 #ifdef NLS
     42 #include <limits.h>
     43 #include <nl_types.h>
     44 #define __SETLOCALE_SOURCE__
     45 #include <locale.h>
     46 #include "setlocale_local.h"
     47 #endif
     48 
     49 #include "extern.h"
     50 
     51 __weak_alias(strerror_r, _strerror_r)
     52 
     53 int
     54 _strerror_lr(int num, char *buf, size_t buflen, locale_t loc)
     55 {
     56 #define	UPREFIX	"Unknown error: %u"
     57 	unsigned int errnum = num;
     58 	int retval = 0;
     59 	size_t slen;
     60 #ifdef NLS
     61 	int saved_errno = errno;
     62 	nl_catd catd;
     63 	catd = catopen_l("libc", NL_CAT_LOCALE, loc);
     64 #endif
     65 	_DIAGASSERT(buf != NULL);
     66 
     67 	if (errnum < (unsigned int) sys_nerr) {
     68 #ifdef NLS
     69 		slen = strlcpy(buf, catgets(catd, 1, (int)errnum,
     70 		    sys_errlist[errnum]), buflen);
     71 #else
     72 		slen = strlcpy(buf, sys_errlist[errnum], buflen);
     73 #endif
     74 	} else {
     75 #ifdef NLS
     76 		slen = snprintf_l(buf, buflen, loc,
     77 		    catgets(catd, 1, 0xffff, UPREFIX), errnum);
     78 #else
     79 		slen = snprintf(buf, buflen, UPREFIX, errnum);
     80 #endif
     81 		retval = EINVAL;
     82 	}
     83 
     84 	if (slen >= buflen)
     85 		retval = ERANGE;
     86 
     87 #ifdef NLS
     88 	catclose(catd);
     89 	errno = saved_errno;
     90 #endif
     91 
     92 	return retval;
     93 }
     94 
     95 int
     96 strerror_r(int num, char *buf, size_t buflen)
     97 {
     98 #ifdef NLS
     99 	return _strerror_lr(num, buf, buflen, _current_locale());
    100 #else
    101 	return _strerror_lr(num, buf, buflen, NULL);
    102 #endif
    103 }
    104