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      1 /*	$NetBSD: strerror.c,v 1.18 2020/03/25 16:10:17 kre 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.c,v 1.18 2020/03/25 16:10:17 kre Exp $");
     34 
     35 #define __SETLOCALE_SOURCE__
     36 
     37 #include "namespace.h"
     38 #include <errno.h>
     39 #include <limits.h>
     40 #include <locale.h>
     41 #include <stdlib.h>
     42 #include <string.h>
     43 
     44 #include "extern.h"
     45 #ifdef _REENTRANT
     46 #include "reentrant.h"
     47 #endif
     48 #include "setlocale_local.h"
     49 
     50 __weak_alias(strerror_l, _strerror_l)
     51 
     52 __aconst char *
     53 strerror(int num)
     54 {
     55 
     56 	return strerror_l(num, _current_locale());
     57 }
     58 
     59 #ifdef _REENTRANT
     60 static thread_key_t strerror_key;
     61 static once_t strerror_once = ONCE_INITIALIZER;
     62 
     63 static void
     64 strerror_setup(void)
     65 {
     66 
     67 	thr_keycreate(&strerror_key, free);
     68 }
     69 #endif
     70 
     71 __aconst char *
     72 strerror_l(int num, locale_t loc)
     73 {
     74 	int error;
     75 #ifdef _REENTRANT
     76 	char *buf;
     77 
     78 	thr_once(&strerror_once, strerror_setup);
     79 	buf = thr_getspecific(strerror_key);
     80 	if (buf == NULL) {
     81 		error = errno;
     82 		buf = malloc(NL_TEXTMAX);
     83 		errno = error;
     84 		if (buf == NULL) {
     85 			static char fallback_buf[NL_TEXTMAX];
     86 			buf = fallback_buf;
     87 		}
     88 		thr_setspecific(strerror_key, buf);
     89 	}
     90 #else
     91 	static char buf[NL_TEXTMAX];
     92 #endif
     93 
     94 	error = _strerror_lr(num, buf, NL_TEXTMAX, loc);
     95 	if (error)
     96 		errno = error;
     97 	return buf;
     98 }
     99