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 34 #include "port_before.h" 35 36 #include <sys/param.h> 37 #include <sys/types.h> 38 39 #include <string.h> 40 41 #include "port_after.h" 42 43 #ifndef NEED_STRERROR 44 int __strerror_unneeded__; 45 #else 46 47 #ifdef USE_SYSERROR_LIST 48 extern int sys_nerr; 49 extern char *sys_errlist[]; 50 #endif 51 52 const char * 53 isc_strerror(int num) { 54 #define UPREFIX "Unknown error: " 55 static char ebuf[40] = UPREFIX; /*%< 64-bit number + slop */ 56 u_int errnum; 57 char *p, *t; 58 #ifndef USE_SYSERROR_LIST 59 const char *ret; 60 #endif 61 char tmp[40]; 62 63 errnum = num; /*%< convert to unsigned */ 64 #ifdef USE_SYSERROR_LIST 65 if (errnum < (u_int)sys_nerr) 66 return (sys_errlist[errnum]); 67 #else 68 #undef strerror 69 ret = strerror(num); /*%< call strerror() in libc */ 70 if (ret != NULL) 71 return(ret); 72 #endif 73 74 /* Do this by hand, so we don't include stdio(3). */ 75 t = tmp; 76 do { 77 *t++ = "0123456789"[errnum % 10]; 78 } while (errnum /= 10); 79 for (p = ebuf + sizeof(UPREFIX) - 1;;) { 80 *p++ = *--t; 81 if (t <= tmp) 82 break; 83 } 84 return (ebuf); 85 } 86 87 #endif /*NEED_STRERROR*/ 88 89 /*! \file */ 90