1 /*- 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)strerror.c 8.1 (Berkeley) 6/4/93 30 * $FreeBSD: head/lib/libc/string/strerror.c 255108 2013-08-31 22:32:42Z jilles $ 31 * (errlst.h removed) 32 */ 33 34 #if defined(NLS) 35 #include <nl_types.h> 36 #endif 37 38 #include <limits.h> 39 #include <errno.h> 40 #include <string.h> 41 #include <stdio.h> 42 43 #include "../locale/xlocale_private.h" 44 #include "libc_private.h" 45 46 #define UPREFIX "Unknown error" 47 48 /* 49 * Define a buffer size big enough to describe a 64-bit signed integer 50 * converted to ASCII decimal (19 bytes), with an optional leading sign 51 * (1 byte); finally, we get the prefix, delimiter (": ") and a trailing 52 * NUL from UPREFIX. 53 */ 54 #define EBUFSIZE (20 + 2 + sizeof(UPREFIX)) 55 56 /* 57 * Doing this by hand instead of linking with stdio(3) avoids bloat for 58 * statically linked binaries. 59 */ 60 static void 61 errstr(int num, char *uprefix, char *buf, size_t len) 62 { 63 char *t; 64 unsigned int uerr; 65 char tmp[EBUFSIZE]; 66 67 t = tmp + sizeof(tmp); 68 *--t = '\0'; 69 uerr = (num >= 0) ? num : -num; 70 do { 71 *--t = "0123456789"[uerr % 10]; 72 } while (uerr /= 10); 73 if (num < 0) 74 *--t = '-'; 75 *--t = ' '; 76 *--t = ':'; 77 strlcpy(buf, uprefix, len); 78 strlcat(buf, t, len); 79 } 80 81 static int 82 strerror_rl(int errnum, char *strerrbuf, size_t buflen, locale_t locale) 83 { 84 int retval = 0; 85 #if defined(NLS) 86 int saved_errno = errno; 87 nl_catd catd; 88 89 catd = __catopen_l("libc", NL_CAT_LOCALE, locale); 90 #endif 91 92 if (errnum < 0 || errnum >= sys_nerr) { 93 errstr(errnum, 94 #if defined(NLS) 95 catgets(catd, 1, 0xffff, UPREFIX), 96 #else 97 UPREFIX, 98 #endif 99 strerrbuf, buflen); 100 retval = EINVAL; 101 } else { 102 if (strlcpy(strerrbuf, 103 #if defined(NLS) 104 catgets(catd, 1, errnum, sys_errlist[errnum]), 105 #else 106 sys_errlist[errnum], 107 #endif 108 buflen) >= buflen) 109 retval = ERANGE; 110 } 111 112 #if defined(NLS) 113 catclose(catd); 114 errno = saved_errno; 115 #endif 116 117 return (retval); 118 } 119 120 int 121 strerror_r(int errnum, char *strerrbuf, size_t buflen) 122 { 123 return (strerror_rl(errnum, strerrbuf, buflen, __get_locale())); 124 } 125 126 char * 127 strerror_l(int num, locale_t locale) 128 { 129 static _Thread_local char ebuf[NL_TEXTMAX]; 130 131 if (strerror_rl(num, ebuf, sizeof(ebuf), locale) != 0) 132 errno = EINVAL; 133 return (ebuf); 134 } 135 136 char * 137 strerror(int num) 138 { 139 static char ebuf[NL_TEXTMAX]; 140 141 if (strerror_rl(num, ebuf, sizeof(ebuf), __get_locale()) != 0) 142 errno = EINVAL; 143 return (ebuf); 144 } 145