1 /*- 2 * Copyright (c) 1980 The 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 #ifndef lint 35 static char sccsid[] = "@(#)unctime.c 5.4 (Berkeley) 3/7/91"; 36 static char rcsid[] = "$Header: /cvsroot/src/sbin/dump/unctime.c,v 1.3 1993/03/23 00:27:23 cgd Exp $"; 37 #endif /* not lint */ 38 39 #include <sys/types.h> 40 #include <time.h> 41 #include <stdio.h> 42 #ifdef __STDC__ 43 #include <stdlib.h> 44 #include <string.h> 45 #endif 46 47 /* 48 * Convert a ctime(3) format string into a system format date. 49 * Return the date thus calculated. 50 * 51 * Return -1 if the string is not in ctime format. 52 */ 53 54 /* 55 * Offsets into the ctime string to various parts. 56 */ 57 58 #define E_MONTH 4 59 #define E_DAY 8 60 #define E_HOUR 11 61 #define E_MINUTE 14 62 #define E_SECOND 17 63 #define E_YEAR 20 64 65 static int lookup(); 66 67 time_t 68 unctime(str) 69 char *str; 70 { 71 struct tm then; 72 char dbuf[30]; 73 time_t emitl(); 74 75 if (strlen(str) != 25) 76 str[25] = 0; 77 strcpy(dbuf, str); 78 dbuf[E_MONTH+3] = 0; 79 if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0) 80 return (-1); 81 then.tm_mday = atoi(&dbuf[E_DAY]); 82 then.tm_hour = atoi(&dbuf[E_HOUR]); 83 then.tm_min = atoi(&dbuf[E_MINUTE]); 84 then.tm_sec = atoi(&dbuf[E_SECOND]); 85 then.tm_year = atoi(&dbuf[E_YEAR]) - 1900; 86 return(emitl(&then)); 87 } 88 89 static char months[] = 90 "JanFebMarAprMayJunJulAugSepOctNovDec"; 91 92 static int 93 lookup(str) 94 char *str; 95 { 96 register char *cp, *cp2; 97 98 for (cp = months, cp2 = str; *cp != 0; cp += 3) 99 if (strncmp(cp, cp2, 3) == 0) 100 return((cp-months) / 3); 101 return(-1); 102 } 103 /* 104 * Routine to convert a localtime(3) format date back into 105 * a system format date. 106 * 107 * Use a binary search. 108 */ 109 110 struct tm *localtime(); 111 static int dcmp(); 112 113 time_t 114 emitl(dp) 115 struct tm *dp; 116 { 117 time_t conv; 118 register int i, bit; 119 struct tm dcopy; 120 121 dcopy = *dp; 122 dp = &dcopy; 123 conv = 0; 124 for (i = 30; i >= 0; i--) { 125 bit = 1 << i; 126 conv |= bit; 127 if (dcmp(localtime(&conv), dp) > 0) 128 conv &= ~bit; 129 } 130 return(conv); 131 } 132 133 /* 134 * Compare two localtime dates, return result. 135 */ 136 137 #define DECIDE(a) \ 138 if (dp->a > dp2->a) \ 139 return(1); \ 140 if (dp->a < dp2->a) \ 141 return(-1) 142 143 static int 144 dcmp(dp, dp2) 145 register struct tm *dp, *dp2; 146 { 147 148 DECIDE(tm_year); 149 DECIDE(tm_mon); 150 DECIDE(tm_mday); 151 DECIDE(tm_hour); 152 DECIDE(tm_min); 153 DECIDE(tm_sec); 154 return(0); 155 } 156