1 /* $NetBSD: ns_date.c,v 1.2 2018/12/13 08:39:34 maya Exp $ */ 2 3 /* 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (c) 1999 by Internet Software Consortium. 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/cdefs.h> 21 #if 0 22 static const char rcsid[] = "Id: ns_date.c,v 1.6 2005/04/27 04:56:39 sra Exp "; 23 #else 24 __RCSID("$NetBSD: ns_date.c,v 1.2 2018/12/13 08:39:34 maya Exp $"); 25 #endif 26 27 /* Import. */ 28 29 #include "port_before.h" 30 31 #include <arpa/nameser.h> 32 33 #include <ctype.h> 34 #include <errno.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <time.h> 38 39 #include "port_after.h" 40 41 /* Forward. */ 42 43 static int datepart(const char *, int, int, int, int *); 44 45 /* Public. */ 46 47 /*% 48 * Convert a date in ASCII into the number of seconds since 49 * 1 January 1970 (GMT assumed). Format is yyyymmddhhmmss, all 50 * digits required, no spaces allowed. 51 */ 52 53 u_int32_t 54 ns_datetosecs(const char *cp, int *errp) { 55 struct tm tim; 56 u_int32_t result; 57 int mdays, i; 58 static const int days_per_month[12] = 59 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; 60 61 if (strlen(cp) != 14U) { 62 *errp = 1; 63 return (0); 64 } 65 *errp = 0; 66 67 memset(&tim, 0, sizeof tim); 68 tim.tm_year = datepart(cp + 0, 4, 1990, 9999, errp) - 1900; 69 tim.tm_mon = datepart(cp + 4, 2, 01, 12, errp) - 1; 70 tim.tm_mday = datepart(cp + 6, 2, 01, 31, errp); 71 tim.tm_hour = datepart(cp + 8, 2, 00, 23, errp); 72 tim.tm_min = datepart(cp + 10, 2, 00, 59, errp); 73 tim.tm_sec = datepart(cp + 12, 2, 00, 59, errp); 74 if (*errp) /*%< Any parse errors? */ 75 return (0); 76 77 /* 78 * OK, now because timegm() is not available in all environments, 79 * we will do it by hand. Roll up sleeves, curse the gods, begin! 80 */ 81 82 #define SECS_PER_DAY ((u_int32_t)24*60*60) 83 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) 84 85 result = tim.tm_sec; /*%< Seconds */ 86 result += tim.tm_min * 60; /*%< Minutes */ 87 result += tim.tm_hour * (60*60); /*%< Hours */ 88 result += (tim.tm_mday - 1) * SECS_PER_DAY; /*%< Days */ 89 /* Months are trickier. Look without leaping, then leap */ 90 mdays = 0; 91 for (i = 0; i < tim.tm_mon; i++) 92 mdays += days_per_month[i]; 93 result += mdays * SECS_PER_DAY; /*%< Months */ 94 if (tim.tm_mon > 1 && isleap(1900+tim.tm_year)) 95 result += SECS_PER_DAY; /*%< Add leapday for this year */ 96 /* First figure years without leapdays, then add them in. */ 97 /* The loop is slow, FIXME, but simple and accurate. */ 98 result += (tim.tm_year - 70) * (SECS_PER_DAY*365); /*%< Years */ 99 for (i = 70; i < tim.tm_year; i++) 100 if (isleap(1900+i)) 101 result += SECS_PER_DAY; /*%< Add leapday for prev year */ 102 return (result); 103 } 104 105 /* Private. */ 106 107 /*% 108 * Parse part of a date. Set error flag if any error. 109 * Don't reset the flag if there is no error. 110 */ 111 static int 112 datepart(const char *buf, int size, int min, int max, int *errp) { 113 int result = 0; 114 int i; 115 116 for (i = 0; i < size; i++) { 117 if (!isdigit((unsigned char)(buf[i]))) 118 *errp = 1; 119 result = (result * 10) + buf[i] - '0'; 120 } 121 if (result < min) 122 *errp = 1; 123 if (result > max) 124 *errp = 1; 125 return (result); 126 } 127 128 /*! \file */ 129