1/* 2 * Copyright (c) 1999 by Internet Software Consortium. 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS 9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE 11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 15 * SOFTWARE. 16 */ 17 18#ifndef __APPLE__ 19#ifndef lint 20static const char rcsid[] = "$Id: ns_date.c,v 1.1 2006/03/01 19:01:36 majka Exp $"; 21#endif 22#endif 23 24/* Import. */ 25 26#ifndef __APPLE__ 27#include "port_before.h" 28#endif 29 30#include <arpa/nameser.h> 31 32#include <ctype.h> 33#include <errno.h> 34#include <stdio.h> 35#include <string.h> 36#include <time.h> 37 38#ifndef __APPLE__ 39#include "port_after.h" 40#endif 41 42#ifdef SPRINTF_CHAR 43# define SPRINTF(x) strlen(sprintf/**/x) 44#else 45# define SPRINTF(x) ((size_t)sprintf x) 46#endif 47 48/* Forward. */ 49 50static int datepart(const char *, int, int, int, int *); 51 52/* Public. */ 53 54/* Convert a date in ASCII into the number of seconds since 55 1 January 1970 (GMT assumed). Format is yyyymmddhhmmss, all 56 digits required, no spaces allowed. */ 57 58u_int32_t 59ns_datetosecs(const char *cp, int *errp) { 60 struct tm time; 61 u_int32_t result; 62 int mdays, i; 63 static const int days_per_month[12] = 64 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; 65 66 if (strlen(cp) != 14) { 67 *errp = 1; 68 return (0); 69 } 70 *errp = 0; 71 72 memset(&time, 0, sizeof time); 73 time.tm_year = datepart(cp + 0, 4, 1990, 9999, errp) - 1900; 74 time.tm_mon = datepart(cp + 4, 2, 01, 12, errp) - 1; 75 time.tm_mday = datepart(cp + 6, 2, 01, 31, errp); 76 time.tm_hour = datepart(cp + 8, 2, 00, 23, errp); 77 time.tm_min = datepart(cp + 10, 2, 00, 59, errp); 78 time.tm_sec = datepart(cp + 12, 2, 00, 59, errp); 79 if (*errp) /* Any parse errors? */ 80 return (0); 81 82 /* 83 * OK, now because timegm() is not available in all environments, 84 * we will do it by hand. Roll up sleeves, curse the gods, begin! 85 */ 86 87#define SECS_PER_DAY ((u_int32_t)24*60*60) 88#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) 89 90 result = time.tm_sec; /* Seconds */ 91 result += time.tm_min * 60; /* Minutes */ 92 result += time.tm_hour * (60*60); /* Hours */ 93 result += (time.tm_mday - 1) * SECS_PER_DAY; /* Days */ 94 95 /* Months are trickier. Look without leaping, then leap */ 96 mdays = 0; 97 for (i = 0; i < time.tm_mon; i++) 98 mdays += days_per_month[i]; 99 result += mdays * SECS_PER_DAY; /* Months */ 100 if (time.tm_mon > 1 && isleap(1900+time.tm_year)) 101 result += SECS_PER_DAY; /* Add leapday for this year */ 102 103 /* First figure years without leapdays, then add them in. */ 104 /* The loop is slow, FIXME, but simple and accurate. */ 105 result += (time.tm_year - 70) * (SECS_PER_DAY*365); /* Years */ 106 for (i = 70; i < time.tm_year; i++) 107 if (isleap(1900+i)) 108 result += SECS_PER_DAY; /* Add leapday for prev year */ 109 110 return (result); 111} 112 113/* Private. */ 114 115/* 116 * Parse part of a date. Set error flag if any error. 117 * Don't reset the flag if there is no error. 118 */ 119static int 120datepart(const char *buf, int size, int min, int max, int *errp) { 121 int result = 0; 122 int i; 123 124 for (i = 0; i < size; i++) { 125 if (!isdigit((unsigned char)(buf[i]))) 126 *errp = 1; 127 result = (result * 10) + buf[i] - '0'; 128 } 129 if (result < min) 130 *errp = 1; 131 if (result > max) 132 *errp = 1; 133 return (result); 134} 135