external/bsd/bind/dist/lib/dns/time.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 1998-2003  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or 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 WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: time.c,v 1.33 2009/01/17 23:47:43 tbox Exp */
  21
  22 /*! \file */
  23
  24 #include <config.h>
  25
  26 #include <stdio.h>
  27 #include <isc/string.h>         /* Required for HP/UX (and others?) */
  28 #include <time.h>
  29
  30 #include <isc/print.h>
  31 #include <isc/region.h>
  32 #include <isc/stdtime.h>
  33 #include <isc/util.h>
  34
  35 #include <dns/result.h>
  36 #include <dns/time.h>
  37
  38 static int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  39
  40 isc_result_t
  41 dns_time64_totext(isc_int64_t t, isc_buffer_t *target) {
  42         struct tm tm;
  43         char buf[sizeof("YYYYMMDDHHMMSS")];
  44         int secs;
  45         unsigned int l;
  46         isc_region_t region;
  47
  48         REQUIRE(t >= 0);
  49
  50 #define is_leap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  51 #define year_secs(y) ((is_leap(y) ? 366 : 365 ) * 86400)
  52 #define month_secs(m,y) ((days[m] + ((m == 1 && is_leap(y)) ? 1 : 0 )) * 86400)
  53
  54         tm.tm_year = 70;
  55         while ((secs = year_secs(tm.tm_year + 1900)) <= t) {
  56                 t -= secs;
  57                 tm.tm_year++;
  58                 if (tm.tm_year + 1900 > 9999)
  59                         return (ISC_R_RANGE);
  60         }
  61         tm.tm_mon = 0;
  62         while ((secs = month_secs(tm.tm_mon, tm.tm_year + 1900)) <= t) {
  63                 t -= secs;
  64                 tm.tm_mon++;
  65         }
  66         tm.tm_mday = 1;
  67         while (86400 <= t) {
  68                 t -= 86400;
  69                 tm.tm_mday++;
  70         }
  71         tm.tm_hour = 0;
  72         while (3600 <= t) {
  73                 t -= 3600;
  74                 tm.tm_hour++;
  75         }
  76         tm.tm_min = 0;
  77         while (60 <= t) {
  78                 t -= 60;
  79                 tm.tm_min++;
  80         }
  81         tm.tm_sec = (int)t;
  82                                  /* yyyy  mm  dd  HH  MM  SS */
  83         snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02d",
  84                  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
  85                  tm.tm_hour, tm.tm_min, tm.tm_sec);
  86
  87         isc_buffer_availableregion(target, &region);
  88         l = strlen(buf);
  89
  90         if (l > region.length)
  91                 return (ISC_R_NOSPACE);
  92
  93         memcpy(region.base, buf, l);
  94         isc_buffer_add(target, l);
  95         return (ISC_R_SUCCESS);
  96 }
  97
  98 isc_result_t
  99 dns_time32_totext(isc_uint32_t value, isc_buffer_t *target) {
 100         isc_stdtime_t now;
 101         isc_int64_t start;
 102         isc_int64_t base;
 103         isc_int64_t t;
 104
 105         /*
 106          * Adjust the time to the closest epoch.  This should be changed
 107          * to use a 64-bit counterpart to isc_stdtime_get() if one ever
 108          * is defined, but even the current code is good until the year
 109          * 2106.
 110          */
 111         isc_stdtime_get(&now);
 112         start = (isc_int64_t) now;
 113         start -= 0x7fffffff;
 114         base = 0;
 115         while ((t = (base + value)) < start) {
 116                 base += 0x80000000;
 117                 base += 0x80000000;
 118         }
 119         return (dns_time64_totext(t, target));
 120 }
 121
 122 isc_result_t
 123 dns_time64_fromtext(const char *source, isc_int64_t *target) {
 124         int year, month, day, hour, minute, second;
 125         isc_int64_t value;
 126         int secs;
 127         int i;
 128
 129 #define RANGE(min, max, value) \
 130         do { \
 131                 if (value < (min) || value > (max)) \
 132                         return (ISC_R_RANGE); \
 133         } while (0)
 134
 135         if (strlen(source) != 14U)
 136                 return (DNS_R_SYNTAX);
 137         if (sscanf(source, "%4d%2d%2d%2d%2d%2d",
 138                    &year, &month, &day, &hour, &minute, &second) != 6)
 139                 return (DNS_R_SYNTAX);
 140
 141         RANGE(1970, 9999, year);
 142         RANGE(1, 12, month);
 143         RANGE(1, days[month - 1] +
 144                  ((month == 2 && is_leap(year)) ? 1 : 0), day);
 145         RANGE(0, 23, hour);
 146         RANGE(0, 59, minute);
 147         RANGE(0, 60, second);           /* 60 == leap second. */
 148
 149         /*
 150          * Calculate seconds since epoch.
 151          */
 152         value = second + (60 * minute) + (3600 * hour) + ((day - 1) * 86400);
 153         for (i = 0; i < (month - 1); i++)
 154                 value += days[i] * 86400;
 155         if (is_leap(year) && month > 2)
 156                 value += 86400;
 157         for (i = 1970; i < year; i++) {
 158                 secs = (is_leap(i) ? 366 : 365) * 86400;
 159                 value += secs;
 160         }
 161
 162         *target = value;
 163         return (ISC_R_SUCCESS);
 164 }
 165
 166 isc_result_t
 167 dns_time32_fromtext(const char *source, isc_uint32_t *target) {
 168         isc_int64_t value64;
 169         isc_result_t result;
 170         result = dns_time64_fromtext(source, &value64);
 171         if (result != ISC_R_SUCCESS)
 172                 return (result);
 173         *target = (isc_uint32_t)value64;
 174
 175         return (ISC_R_SUCCESS);
 176 }