strerror.c revision 251069
1108118Smike/*- 21573Srgrimes * Copyright (c) 1988, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * Redistribution and use in source and binary forms, with or without 61573Srgrimes * modification, are permitted provided that the following conditions 71573Srgrimes * are met: 81573Srgrimes * 1. Redistributions of source code must retain the above copyright 91573Srgrimes * notice, this list of conditions and the following disclaimer. 101573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111573Srgrimes * notice, this list of conditions and the following disclaimer in the 121573Srgrimes * documentation and/or other materials provided with the distribution. 13251069Semaste * 3. Neither the name of the University nor the names of its contributors 141573Srgrimes * may be used to endorse or promote products derived from this software 151573Srgrimes * without specific prior written permission. 161573Srgrimes * 171573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271573Srgrimes * SUCH DAMAGE. 281573Srgrimes */ 291573Srgrimes 301573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 311573Srgrimesstatic char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93"; 321573Srgrimes#endif /* LIBC_SCCS and not lint */ 3386170Sobrien#include <sys/cdefs.h> 3486170Sobrien__FBSDID("$FreeBSD: head/lib/libc/string/strerror.c 251069 2013-05-28 20:57:40Z emaste $"); 351573Srgrimes 36142667Sphantom#if defined(NLS) 37142667Sphantom#include <nl_types.h> 38142667Sphantom#endif 39142667Sphantom 40142693Sphantom#include <limits.h> 41108044Smike#include <errno.h> 42142667Sphantom#include <string.h> 432505Sbde#include <stdio.h> 441573Srgrimes 45142667Sphantom#define UPREFIX "Unknown error" 46108118Smike 47108044Smike/* 48108044Smike * Define a buffer size big enough to describe a 64-bit signed integer 49108044Smike * converted to ASCII decimal (19 bytes), with an optional leading sign 50142667Sphantom * (1 byte); finally, we get the prefix, delimiter (": ") and a trailing 51142667Sphantom * NUL from UPREFIX. 52108044Smike */ 53142667Sphantom#define EBUFSIZE (20 + 2 + sizeof(UPREFIX)) 541573Srgrimes 55108118Smike/* 56108118Smike * Doing this by hand instead of linking with stdio(3) avoids bloat for 57108118Smike * statically linked binaries. 58108118Smike */ 59108044Smikestatic void 60142667Sphantomerrstr(int num, char *uprefix, char *buf, size_t len) 6187434Swes{ 62108603Smike char *t; 63108044Smike unsigned int uerr; 64108044Smike char tmp[EBUFSIZE]; 6587434Swes 66108603Smike t = tmp + sizeof(tmp); 67108603Smike *--t = '\0'; 68108044Smike uerr = (num >= 0) ? num : -num; 691573Srgrimes do { 70108603Smike *--t = "0123456789"[uerr % 10]; 7186944Swes } while (uerr /= 10); 7287434Swes if (num < 0) 73108603Smike *--t = '-'; 74142667Sphantom *--t = ' '; 75142667Sphantom *--t = ':'; 76142667Sphantom strlcpy(buf, uprefix, len); 77114443Snectar strlcat(buf, t, len); 781573Srgrimes} 7986944Swes 80108044Smikeint 81108044Smikestrerror_r(int errnum, char *strerrbuf, size_t buflen) 82108044Smike{ 83142667Sphantom int retval = 0; 84142667Sphantom#if defined(NLS) 85142667Sphantom int saved_errno = errno; 86142667Sphantom nl_catd catd; 87142667Sphantom catd = catopen("libc", NL_CAT_LOCALE); 88142667Sphantom#endif 8986944Swes 90220376Sjilles if (errnum < 0 || errnum >= sys_nerr) { 91142667Sphantom errstr(errnum, 92142667Sphantom#if defined(NLS) 93142667Sphantom catgets(catd, 1, 0xffff, UPREFIX), 94142667Sphantom#else 95142667Sphantom UPREFIX, 96142667Sphantom#endif 97142667Sphantom strerrbuf, buflen); 98142667Sphantom retval = EINVAL; 99142667Sphantom } else { 100142667Sphantom if (strlcpy(strerrbuf, 101142667Sphantom#if defined(NLS) 102142667Sphantom catgets(catd, 1, errnum, sys_errlist[errnum]), 103142667Sphantom#else 104142667Sphantom sys_errlist[errnum], 105142667Sphantom#endif 106142667Sphantom buflen) >= buflen) 107142667Sphantom retval = ERANGE; 108108118Smike } 109142667Sphantom 110142667Sphantom#if defined(NLS) 111142667Sphantom catclose(catd); 112142667Sphantom errno = saved_errno; 113142667Sphantom#endif 114142667Sphantom 115142667Sphantom return (retval); 116108044Smike} 11786944Swes 118108044Smikechar * 119108044Smikestrerror(int num) 12086944Swes{ 121142667Sphantom static char ebuf[NL_TEXTMAX]; 12286944Swes 123142667Sphantom if (strerror_r(num, ebuf, sizeof(ebuf)) != 0) 124232973Skib errno = EINVAL; 125108044Smike return (ebuf); 12686944Swes} 127