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 #define UPREFIX "Unknown error" 44 45 /* 46 * Define a buffer size big enough to describe a 64-bit signed integer 47 * converted to ASCII decimal (19 bytes), with an optional leading sign 48 * (1 byte); finally, we get the prefix, delimiter (": ") and a trailing 49 * NUL from UPREFIX. 50 */ 51 #define EBUFSIZE (20 + 2 + sizeof(UPREFIX)) 52 53 /* 54 * Doing this by hand instead of linking with stdio(3) avoids bloat for 55 * statically linked binaries. 56 */ 57 static void 58 errstr(int num, char *uprefix, char *buf, size_t len) 59 { 60 char *t; 61 unsigned int uerr; 62 char tmp[EBUFSIZE]; 63 64 t = tmp + sizeof(tmp); 65 *--t = '\0'; 66 uerr = (num >= 0) ? num : -num; 67 do { 68 *--t = "0123456789"[uerr % 10]; 69 } while (uerr /= 10); 70 if (num < 0) 71 *--t = '-'; 72 *--t = ' '; 73 *--t = ':'; 74 strlcpy(buf, uprefix, len); 75 strlcat(buf, t, len); 76 } 77 78 int 79 strerror_r(int errnum, char *strerrbuf, size_t buflen) 80 { 81 int retval = 0; 82 #if defined(NLS) 83 int saved_errno = errno; 84 nl_catd catd; 85 catd = catopen("libc", NL_CAT_LOCALE); 86 #endif 87 88 if (errnum < 0 || errnum >= sys_nerr) { 89 errstr(errnum, 90 #if defined(NLS) 91 catgets(catd, 1, 0xffff, UPREFIX), 92 #else 93 UPREFIX, 94 #endif 95 strerrbuf, buflen); 96 retval = EINVAL; 97 } else { 98 if (strlcpy(strerrbuf, 99 #if defined(NLS) 100 catgets(catd, 1, errnum, sys_errlist[errnum]), 101 #else 102 sys_errlist[errnum], 103 #endif 104 buflen) >= buflen) 105 retval = ERANGE; 106 } 107 108 #if defined(NLS) 109 catclose(catd); 110 errno = saved_errno; 111 #endif 112 113 return (retval); 114 } 115 116 char * 117 strerror(int num) 118 { 119 static char ebuf[NL_TEXTMAX]; 120 121 if (strerror_r(num, ebuf, sizeof(ebuf)) != 0) 122 errno = EINVAL; 123 return (ebuf); 124 } 125