1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. 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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93"; 34 #endif /* LIBC_SCCS and not lint */ 35 #if defined(NLS) 36 #include <nl_types.h> 37 #endif 38 39 #include <limits.h> 40 #include <errno.h> 41 #include <string.h> 42 #include <stdio.h> 43 44 #include "errlst.h" 45 #include "../locale/xlocale_private.h" 46 #include "libc_private.h" 47 48 /* 49 * Define buffer big enough to contain delimiter (": ", 2 bytes), 50 * 64-bit signed integer converted to ASCII decimal (19 bytes) with 51 * optional leading sign (1 byte), and a trailing NUL. 52 */ 53 #define EBUFSIZE (2 + 19 + 1 + 1) 54 55 /* 56 * Doing this by hand instead of linking with stdio(3) avoids bloat for 57 * statically linked binaries. 58 */ 59 static void 60 errstr(int num, const char *uprefix, char *buf, size_t len) 61 { 62 char *t; 63 unsigned int uerr; 64 char tmp[EBUFSIZE]; 65 66 t = tmp + sizeof(tmp); 67 *--t = '\0'; 68 uerr = (num >= 0) ? num : -num; 69 do { 70 *--t = "0123456789"[uerr % 10]; 71 } while (uerr /= 10); 72 if (num < 0) 73 *--t = '-'; 74 *--t = ' '; 75 *--t = ':'; 76 strlcpy(buf, uprefix, len); 77 strlcat(buf, t, len); 78 } 79 80 static int 81 strerror_rl(int errnum, char *strerrbuf, size_t buflen, locale_t locale) 82 { 83 int retval = 0; 84 #if defined(NLS) 85 int saved_errno = errno; 86 nl_catd catd; 87 88 catd = __catopen_l("libc", NL_CAT_LOCALE, locale); 89 #endif 90 91 if (errnum < 0 || errnum >= __hidden_sys_nerr) { 92 errstr(errnum, 93 #if defined(NLS) 94 catgets(catd, 1, 0xffff, __uprefix), 95 #else 96 __uprefix, 97 #endif 98 strerrbuf, buflen); 99 retval = EINVAL; 100 } else { 101 if (strlcpy(strerrbuf, 102 #if defined(NLS) 103 catgets(catd, 1, errnum, __hidden_sys_errlist[errnum]), 104 #else 105 __hidden_sys_errlist[errnum], 106 #endif 107 buflen) >= buflen) 108 retval = ERANGE; 109 } 110 111 #if defined(NLS) 112 catclose(catd); 113 errno = saved_errno; 114 #endif 115 116 return (retval); 117 } 118 119 int 120 strerror_r(int errnum, char *strerrbuf, size_t buflen) 121 { 122 return (strerror_rl(errnum, strerrbuf, buflen, __get_locale())); 123 } 124 125 char * 126 strerror_l(int num, locale_t locale) 127 { 128 static _Thread_local char ebuf[NL_TEXTMAX]; 129 130 if (strerror_rl(num, ebuf, sizeof(ebuf), locale) != 0) 131 errno = EINVAL; 132 return (ebuf); 133 } 134 135 char * 136 strerror(int num) 137 { 138 static char ebuf[NL_TEXTMAX]; 139 140 if (strerror_rl(num, ebuf, sizeof(ebuf), __get_locale()) != 0) 141 errno = EINVAL; 142 return (ebuf); 143 } 144