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: src/lib/libc/string/strerror.c,v 1.16 2007/01/09 00:28:12 imp Exp $ 31 */ 32 33 #if defined(NLS) 34 #include <nl_types.h> 35 #endif 36 37 #include <limits.h> 38 #include <errno.h> 39 #include <string.h> 40 #include <stdio.h> 41 42 #define UPREFIX "Unknown error" 43 44 /* 45 * Define a buffer size big enough to describe a 64-bit signed integer 46 * converted to ASCII decimal (19 bytes), with an optional leading sign 47 * (1 byte); finally, we get the prefix, delimiter (": ") and a trailing 48 * NUL from UPREFIX. 49 */ 50 #define EBUFSIZE (20 + 2 + sizeof(UPREFIX)) 51 52 /* 53 * Doing this by hand instead of linking with stdio(3) avoids bloat for 54 * statically linked binaries. 55 */ 56 static void 57 errstr(int num, char *uprefix, char *buf, size_t len) 58 { 59 char *t; 60 unsigned int uerr; 61 char tmp[EBUFSIZE]; 62 63 t = tmp + sizeof(tmp); 64 *--t = '\0'; 65 uerr = (num >= 0) ? num : -num; 66 do { 67 *--t = "0123456789"[uerr % 10]; 68 } while (uerr /= 10); 69 if (num < 0) 70 *--t = '-'; 71 *--t = ' '; 72 *--t = ':'; 73 strlcpy(buf, uprefix, len); 74 strlcat(buf, t, len); 75 } 76 77 int 78 strerror_r(int errnum, char *strerrbuf, size_t buflen) 79 { 80 int retval = 0; 81 #if defined(NLS) 82 int saved_errno = errno; 83 nl_catd catd; 84 catd = catopen("libc", NL_CAT_LOCALE); 85 #endif 86 87 if (errnum < 1 || errnum >= sys_nerr) { 88 errstr(errnum, 89 #if defined(NLS) 90 catgets(catd, 1, 0xffff, UPREFIX), 91 #else 92 UPREFIX, 93 #endif 94 strerrbuf, buflen); 95 retval = EINVAL; 96 } else { 97 if (strlcpy(strerrbuf, 98 #if defined(NLS) 99 catgets(catd, 1, errnum, sys_errlist[errnum]), 100 #else 101 sys_errlist[errnum], 102 #endif 103 buflen) >= buflen) 104 retval = ERANGE; 105 } 106 107 #if defined(NLS) 108 catclose(catd); 109 errno = saved_errno; 110 #endif 111 112 return (retval); 113 } 114 115 char * 116 strerror(int num) 117 { 118 static char ebuf[NL_TEXTMAX]; 119 120 if (strerror_r(num, ebuf, sizeof(ebuf)) != 0) 121 errno = EINVAL; 122 return (ebuf); 123 } 124