1/* $NetBSD: strerror.c,v 1.2 2011/02/16 03:46:59 christos Exp $ */ 2 3/* 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#if defined(LIBC_SCCS) && !defined(lint) 37static const char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93"; 38#endif /* LIBC_SCCS and not lint */ 39 40#include <sys/types.h> 41 42#include <string.h> 43 44#include "gnuc.h" 45#ifdef HAVE_OS_PROTO_H 46#include "os-proto.h" 47#endif 48 49char * 50strerror(num) 51 int num; 52{ 53 extern int sys_nerr; 54 extern char *sys_errlist[]; 55#define UPREFIX "Unknown error: " 56 static char ebuf[40] = UPREFIX; /* 64-bit number + slop */ 57 register unsigned int errnum; 58 register char *p, *t; 59 char tmp[40]; 60 61 errnum = num; /* convert to unsigned */ 62 if (errnum < sys_nerr) 63 return(sys_errlist[errnum]); 64 65 /* Do this by hand, so we don't include stdio(3). */ 66 t = tmp; 67 do { 68 *t++ = "0123456789"[errnum % 10]; 69 } while (errnum /= 10); 70 for (p = ebuf + sizeof(UPREFIX) - 1;;) { 71 *p++ = *--t; 72 if (t <= tmp) 73 break; 74 } 75 *p = '\0'; 76 return(ebuf); 77} 78