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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/lib/libc/string/strerror.c,v 1.2.14.3 2003/01/17 13:39:32 mike Exp $ 34 * $DragonFly: src/lib/libc/string/strerror.c,v 1.2 2003/06/17 04:26:46 dillon Exp $ 35 */ 36 37 #include <errno.h> 38 #include <stdio.h> 39 #include <string.h> 40 41 #define UPREFIX "Unknown error: " 42 43 /* 44 * Define a buffer size big enough to describe a 64-bit signed integer 45 * converted to ASCII decimal (19 bytes), with an optional leading sign 46 * (1 byte); finally, we get the prefix and a trailing NUL from UPREFIX. 47 */ 48 #define EBUFSIZE (20 + sizeof(UPREFIX)) 49 50 /* 51 * Doing this by hand instead of linking with stdio(3) avoids bloat for 52 * statically linked binaries. 53 */ 54 static void 55 errstr(int num, char *buf, size_t len) 56 { 57 char *t; 58 unsigned int uerr; 59 char tmp[EBUFSIZE]; 60 61 t = tmp + sizeof(tmp); 62 *--t = '\0'; 63 uerr = (num >= 0) ? num : -num; 64 do { 65 *--t = "0123456789"[uerr % 10]; 66 } while (uerr /= 10); 67 if (num < 0) 68 *--t = '-'; 69 strlcpy(buf, UPREFIX, len); 70 strlcat(buf, t, len); 71 } 72 73 int 74 strerror_r(int errnum, char *strerrbuf, size_t buflen) 75 { 76 77 if (errnum < 1 || errnum >= sys_nerr) { 78 errstr(errnum, strerrbuf, buflen); 79 return (EINVAL); 80 } 81 if (strlcpy(strerrbuf, sys_errlist[errnum], buflen) >= buflen) 82 return (ERANGE); 83 return (0); 84 } 85 86 char * 87 strerror(int num) 88 { 89 static char ebuf[EBUFSIZE]; 90 91 if (num > 0 && num < sys_nerr) 92 return ((char *)sys_errlist[num]); 93 errno = EINVAL; 94 errstr(num, ebuf, sizeof(ebuf)); 95 return (ebuf); 96 } 97