1 /* $NetBSD: strerror.c,v 1.16 2013/09/02 07:59:32 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.c,v 1.16 2013/09/02 07:59:32 joerg 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 buf = malloc(NL_TEXTMAX); 82 if (buf == NULL) { 83 static char fallback_buf[NL_TEXTMAX]; 84 buf = fallback_buf; 85 } 86 thr_setspecific(strerror_key, buf); 87 } 88 #else 89 static char buf[NL_TEXTMAX]; 90 #endif 91 92 error = _strerror_lr(num, buf, NL_TEXTMAX, loc); 93 if (error) 94 errno = error; 95 return buf; 96 } 97