1 /* 2 * Copyright (c) 1988 Regents of the University of California. 3 * 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 34 #if defined(LIBC_SCCS) && !defined(lint) 35 /*static char *sccsid = "from: @(#)strerror.c 5.6 (Berkeley) 5/4/91";*/ 36 static char *rcsid = "$Id: strerror.c,v 1.2 1993/10/09 00:11:01 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <string.h> 40 41 /* 42 * Since perror() is not allowed to change the contents of strerror()'s 43 * static buffer, both functions supply their own buffers to the 44 * internal function __strerror(). 45 */ 46 47 char * 48 __strerror(num, buf) 49 int num; 50 char *buf; 51 { 52 #define UPREFIX "Unknown error: " 53 extern char *sys_errlist[]; 54 extern int sys_nerr; 55 register unsigned int errnum; 56 register char *p, *t; 57 char tmp[40]; 58 59 errnum = num; /* convert to unsigned */ 60 if (errnum < sys_nerr) 61 return(sys_errlist[errnum]); 62 63 /* Do this by hand, so we don't include stdio(3). */ 64 t = tmp; 65 do { 66 *t++ = "0123456789"[errnum % 10]; 67 } while (errnum /= 10); 68 69 strcpy (buf, UPREFIX); 70 for (p = buf + sizeof(UPREFIX) -1;;) { 71 *p++ = *--t; 72 if (t <= tmp) 73 break; 74 } 75 76 return buf; 77 } 78 79 80 char * 81 strerror(num) 82 int num; 83 { 84 static char buf[40]; /* 64-bit number + slop */ 85 return __strerror(num, buf); 86 } 87