strerror.c (2639B)
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. ***REMOVED*** - see 14 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change 15 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)strerror.c 8.1 (Berkeley) 6/4/93"; 34 #endif /* LIBC_SCCS and not lint */ 35 36 #include <string.h> 37 38 #ifdef _DLL 39 #define sys_nerr (*_sys_nerr_dll) 40 #endif 41 42 #ifndef HAVE_STRERROR 43 #ifndef _AFXDLL 44 char * 45 strerror(num) 46 int num; 47 { 48 extern int sys_nerr; 49 extern char *sys_errlist[]; 50 #define UPREFIX "Unknown error: " 51 static char ebuf[40] = UPREFIX; /* 64-bit number + slop */ 52 register unsigned int errnum; 53 register char *p, *t; 54 char tmp[40]; 55 56 errnum = num; /* convert to unsigned */ 57 if (errnum < sys_nerr) 58 return (sys_errlist[errnum]); 59 60 /* Do this by hand, so we don't include stdio(3). */ 61 t = tmp; 62 do { 63 *t++ = "0123456789"[errnum % 10]; 64 } while (errnum /= 10); 65 for (p = ebuf + sizeof(UPREFIX) - 1;;) { 66 *p++ = *--t; 67 if (t <= tmp) 68 break; 69 } 70 return (ebuf); 71 } 72 73 #endif 74 #endif /* !HAVE_STRERROR */