1 /* 2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 3 * Copyright (c) 1999 by Internet Software Consortium. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #ifndef lint 19 static const char rcsid[] = "$Id: ns_date.c,v 1.6 2005/04/27 04:56:39 sra Exp $"; 20 #endif 21 22 /* Import. */ 23 24 #include "port_before.h" 25 26 #include <arpa/nameser.h> 27 28 #include <ctype.h> 29 #include <errno.h> 30 #include <stdio.h> 31 #include <string.h> 32 #include <time.h> 33 34 #include "port_after.h" 35 36 #ifdef SPRINTF_CHAR 37 # define SPRINTF(x) strlen(sprintf/**/x) 38 #else 39 # define SPRINTF(x) ((size_t)sprintf x) 40 #endif 41 42 /* Forward. */ 43 44 static int datepart(const char *, int, int, int, int *); 45 46 /* Public. */ 47 48 /*% 49 * Convert a date in ASCII into the number of seconds since 50 * 1 January 1970 (GMT assumed). Format is yyyymmddhhmmss, all 51 * digits required, no spaces allowed. 52 */ 53 54 u_int32_t 55 ns_datetosecs(const char *cp, int *errp) { 56 struct tm time; 57 u_int32_t result; 58 int mdays, i; 59 static const int days_per_month[12] = 60 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; 61 62 if (strlen(cp) != 14U) { 63 *errp = 1; 64 return (0); 65 } 66 *errp = 0; 67 68 memset(&time, 0, sizeof time); 69 time.tm_year = datepart(cp + 0, 4, 1990, 9999, errp) - 1900; 70 time.tm_mon = datepart(cp + 4, 2, 01, 12, errp) - 1; 71 time.tm_mday = datepart(cp + 6, 2, 01, 31, errp); 72 time.tm_hour = datepart(cp + 8, 2, 00, 23, errp); 73 time.tm_min = datepart(cp + 10, 2, 00, 59, errp); 74 time.tm_sec = datepart(cp + 12, 2, 00, 59, errp); 75 if (*errp) /*%< Any parse errors? */ 76 return (0); 77 78 /* 79 * OK, now because timegm() is not available in all environments, 80 * we will do it by hand. Roll up sleeves, curse the gods, begin! 81 */ 82 83 #define SECS_PER_DAY ((u_int32_t)24*60*60) 84 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) 85 86 result = time.tm_sec; /*%< Seconds */ 87 result += time.tm_min * 60; /*%< Minutes */ 88 result += time.tm_hour * (60*60); /*%< Hours */ 89 result += (time.tm_mday - 1) * SECS_PER_DAY; /*%< Days */ 90 /* Months are trickier. Look without leaping, then leap */ 91 mdays = 0; 92 for (i = 0; i < time.tm_mon; i++) 93 mdays += days_per_month[i]; 94 result += mdays * SECS_PER_DAY; /*%< Months */ 95 if (time.tm_mon > 1 && isleap(1900+time.tm_year)) 96 result += SECS_PER_DAY; /*%< Add leapday for this year */ 97 /* First figure years without leapdays, then add them in. */ 98 /* The loop is slow, FIXME, but simple and accurate. */ 99 result += (time.tm_year - 70) * (SECS_PER_DAY*365); /*%< Years */ 100 for (i = 70; i < time.tm_year; i++) 101 if (isleap(1900+i)) 102 result += SECS_PER_DAY; /*%< Add leapday for prev year */ 103 return (result); 104 } 105 106 /* Private. */ 107 108 /*% 109 * Parse part of a date. Set error flag if any error. 110 * Don't reset the flag if there is no error. 111 */ 112 static int 113 datepart(const char *buf, int size, int min, int max, int *errp) { 114 int result = 0; 115 int i; 116 117 for (i = 0; i < size; i++) { 118 if (!isdigit((unsigned char)(buf[i]))) 119 *errp = 1; 120 result = (result * 10) + buf[i] - '0'; 121 } 122 if (result < min) 123 *errp = 1; 124 if (result > max) 125 *errp = 1; 126 return (result); 127 } 128 129 /*! \file */ 130