strerror_r.c revision 1.6
1/* $NetBSD: strerror_r.c,v 1.6 2024/06/08 21:35:18 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 1.6 2024/06/08 21:35:18 joerg Exp $"); 34 35#include "namespace.h" 36#include <assert.h> 37#include <atomic.h> 38#include <errno.h> 39#include <stdio.h> 40#include <stdlib.h> 41#include <string.h> 42#include <stdio.h> /* for sys_nerr on FreeBSD */ 43#ifdef NLS 44#include <limits.h> 45#include <nl_types.h> 46#define __SETLOCALE_SOURCE__ 47#include <locale.h> 48#include "setlocale_local.h" 49#endif 50 51#include "extern.h" 52 53#define UPREFIX "Unknown error: %d" 54 55__weak_alias(strerror_r, _strerror_r) 56 57#ifdef NLS 58static void 59load_errlist(locale_t loc) 60{ 61 const char **errlist; 62 char *errlist_prefix; 63 int i; 64 nl_catd catd; 65 catd = catopen_l("libc", NL_CAT_LOCALE, loc); 66 67 if (loc->cache->errlist_prefix == NULL) { 68 errlist_prefix = strdup(catgets(catd, 1, 0xffff, UPREFIX)); 69 if (errlist_prefix == NULL) 70 goto cleanup2; 71 72 membar_release(); 73 if (atomic_cas_ptr(__UNCONST(&loc->cache->errlist_prefix), 74 NULL, errlist_prefix) != NULL) 75 free(errlist_prefix); 76 } 77 78 if (loc->cache->errlist) 79 goto cleanup2; 80 81 errlist = calloc(sys_nerr, sizeof(*errlist)); 82 if (errlist == NULL) 83 goto cleanup2; 84 for (i = 0; i < sys_nerr; ++i) { 85 errlist[i] = strdup(catgets(catd, 1, i, sys_errlist[i])); 86 if (errlist[i] == NULL) 87 goto cleanup; 88 } 89 membar_release(); 90 if (atomic_cas_ptr(__UNCONST(&loc->cache->errlist), NULL, errlist) != NULL) 91 goto cleanup; 92 goto cleanup2; 93 94 cleanup: 95 for (i = 0; i < sys_nerr; ++i) 96 free(__UNCONST(errlist[i])); 97 free(errlist); 98 cleanup2: 99 catclose(catd); 100} 101#endif 102 103int 104_strerror_lr(int num, char *buf, size_t buflen, locale_t loc) 105{ 106 unsigned int errnum = num; 107 int retval = 0; 108 size_t slen; 109 int saved_errno = errno; 110#ifdef NLS 111 const char * const *errlist; 112 const char *errlist_prefix; 113#endif 114 115 _DIAGASSERT(buf != NULL); 116 117 if (errnum < (unsigned int) sys_nerr) { 118#ifdef NLS 119 errlist = *loc->cache->errlistp; 120 membar_datadep_consumer(); 121 if (errlist == NULL) { 122 load_errlist(loc); 123 errlist = *loc->cache->errlistp; 124 membar_datadep_consumer(); 125 if (errlist == NULL) 126 errlist = *LC_C_LOCALE->cache->errlistp; 127 } 128 slen = strlcpy(buf, errlist[errnum], buflen); 129#else 130 slen = strlcpy(buf, sys_errlist[errnum], buflen); 131#endif 132 } else { 133#ifdef NLS 134 errlist_prefix = loc->cache->errlist_prefix; 135 membar_datadep_consumer(); 136 if (errlist_prefix == NULL) { 137 load_errlist(loc); 138 errlist_prefix = loc->cache->errlist_prefix; 139 membar_datadep_consumer(); 140 if (errlist_prefix == NULL) 141 errlist_prefix = LC_C_LOCALE->cache->errlist_prefix; 142 } 143 slen = snprintf_l(buf, buflen, loc, errlist_prefix, num); 144#else 145 slen = snprintf(buf, buflen, UPREFIX, num); 146#endif 147 retval = EINVAL; 148 } 149 150 if (slen >= buflen) 151 retval = ERANGE; 152 153 errno = saved_errno; 154 155 return retval; 156} 157 158int 159strerror_r(int num, char *buf, size_t buflen) 160{ 161#ifdef NLS 162 return _strerror_lr(num, buf, buflen, _current_locale()); 163#else 164 return _strerror_lr(num, buf, buflen, NULL); 165#endif 166} 167