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 #include "port_before.h" 19 20 #include <arpa/nameser.h> 21 22 #include <ctype.h> 23 #include <errno.h> 24 #include <stdio.h> 25 #include <string.h> 26 #include <time.h> 27 28 #include "port_after.h" 29 30 #ifdef SPRINTF_CHAR 31 # define SPRINTF(x) strlen(sprintf/**/x) 32 #else 33 # define SPRINTF(x) ((size_t)sprintf x) 34 #endif 35 36 /* Forward. */ 37 38 static int datepart(const char *, int, int, int, int *); 39 40 /* Public. */ 41 42 /*% 43 * Convert a date in ASCII into the number of seconds since 44 * 1 January 1970 (GMT assumed). Format is yyyymmddhhmmss, all 45 * digits required, no spaces allowed. 46 */ 47 48 u_int32_t 49 ns_datetosecs(const char *cp, int *errp) { 50 struct tm time; 51 u_int32_t result; 52 int mdays, i; 53 static const int days_per_month[12] = 54 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; 55 56 if (strlen(cp) != 14U) { 57 *errp = 1; 58 return (0); 59 } 60 *errp = 0; 61 62 memset(&time, 0, sizeof time); 63 time.tm_year = datepart(cp + 0, 4, 1990, 9999, errp) - 1900; 64 time.tm_mon = datepart(cp + 4, 2, 01, 12, errp) - 1; 65 time.tm_mday = datepart(cp + 6, 2, 01, 31, errp); 66 time.tm_hour = datepart(cp + 8, 2, 00, 23, errp); 67 time.tm_min = datepart(cp + 10, 2, 00, 59, errp); 68 time.tm_sec = datepart(cp + 12, 2, 00, 59, errp); 69 if (*errp) /*%< Any parse errors? */ 70 return (0); 71 72 /* 73 * OK, now because timegm() is not available in all environments, 74 * we will do it by hand. Roll up sleeves, curse the gods, begin! 75 */ 76 77 #define SECS_PER_DAY ((u_int32_t)24*60*60) 78 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) 79 80 result = time.tm_sec; /*%< Seconds */ 81 result += time.tm_min * 60; /*%< Minutes */ 82 result += time.tm_hour * (60*60); /*%< Hours */ 83 result += (time.tm_mday - 1) * SECS_PER_DAY; /*%< Days */ 84 /* Months are trickier. Look without leaping, then leap */ 85 mdays = 0; 86 for (i = 0; i < time.tm_mon; i++) 87 mdays += days_per_month[i]; 88 result += mdays * SECS_PER_DAY; /*%< Months */ 89 if (time.tm_mon > 1 && isleap(1900+time.tm_year)) 90 result += SECS_PER_DAY; /*%< Add leapday for this year */ 91 /* First figure years without leapdays, then add them in. */ 92 /* The loop is slow, FIXME, but simple and accurate. */ 93 result += (time.tm_year - 70) * (SECS_PER_DAY*365); /*%< Years */ 94 for (i = 70; i < time.tm_year; i++) 95 if (isleap(1900+i)) 96 result += SECS_PER_DAY; /*%< Add leapday for prev year */ 97 return (result); 98 } 99 100 /* Private. */ 101 102 /*% 103 * Parse part of a date. Set error flag if any error. 104 * Don't reset the flag if there is no error. 105 */ 106 static int 107 datepart(const char *buf, int size, int min, int max, int *errp) { 108 int result = 0; 109 int i; 110 111 for (i = 0; i < size; i++) { 112 if (!isdigit((unsigned char)(buf[i]))) 113 *errp = 1; 114 result = (result * 10) + buf[i] - '0'; 115 } 116 if (result < min) 117 *errp = 1; 118 if (result > max) 119 *errp = 1; 120 return (result); 121 } 122 123 /*! \file */ 124