contrib/bind-9.3/lib/dns/time.c

   1 /*
   2  * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1998-2003  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 WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: time.c,v 1.18.2.4.2.8 2004/08/28 06:25:20 marka Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <stdio.h>
  23 #include <isc/string.h>         /* Required for HP/UX (and others?) */
  24 #include <time.h>
  25
  26 #include <isc/print.h>
  27 #include <isc/region.h>
  28 #include <isc/stdtime.h>
  29 #include <isc/util.h>
  30
  31 #include <dns/result.h>
  32 #include <dns/time.h>
  33
  34 static int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  35
  36 isc_result_t
  37 dns_time64_totext(isc_int64_t t, isc_buffer_t *target) {
  38         struct tm tm;
  39         char buf[sizeof("YYYYMMDDHHMMSS")];
  40         int secs;
  41         unsigned int l;
  42         isc_region_t region;
  43
  44         REQUIRE(t >= 0);
  45
  46 #define is_leap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  47 #define year_secs(y) ((is_leap(y) ? 366 : 365 ) * 86400)
  48 #define month_secs(m,y) ((days[m] + ((m == 1 && is_leap(y)) ? 1 : 0 )) * 86400)
  49
  50         tm.tm_year = 70;
  51         while ((secs = year_secs(tm.tm_year + 1900)) <= t) {
  52                 t -= secs;
  53                 tm.tm_year++;
  54                 if (tm.tm_year + 1900 > 9999)
  55                         return (ISC_R_RANGE);
  56         }
  57         tm.tm_mon = 0;
  58         while ((secs = month_secs(tm.tm_mon, tm.tm_year + 1900)) <= t) {
  59                 t -= secs;
  60                 tm.tm_mon++;
  61         }
  62         tm.tm_mday = 1;
  63         while (86400 <= t) {
  64                 t -= 86400;
  65                 tm.tm_mday++;
  66         }
  67         tm.tm_hour = 0;
  68         while (3600 <= t) {
  69                 t -= 3600;
  70                 tm.tm_hour++;
  71         }
  72         tm.tm_min = 0;
  73         while (60 <= t) {
  74                 t -= 60;
  75                 tm.tm_min++;
  76         }
  77         tm.tm_sec = (int)t;
  78                                  /* yyyy  mm  dd  HH  MM  SS */
  79         snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02d",
  80                  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
  81                  tm.tm_hour, tm.tm_min, tm.tm_sec);
  82
  83         isc_buffer_availableregion(target, &region);
  84         l = strlen(buf);
  85
  86         if (l > region.length)
  87                 return (ISC_R_NOSPACE);
  88
  89         memcpy(region.base, buf, l);
  90         isc_buffer_add(target, l);
  91         return (ISC_R_SUCCESS);
  92 }
  93
  94 isc_result_t
  95 dns_time32_totext(isc_uint32_t value, isc_buffer_t *target) {
  96         isc_stdtime_t now;
  97         isc_int64_t start;
  98         isc_int64_t base;
  99         isc_int64_t t;
 100
 101         /*
 102          * Adjust the time to the closest epoch.  This should be changed
 103          * to use a 64-bit counterpart to isc_stdtime_get() if one ever
 104          * is defined, but even the current code is good until the year
 105          * 2106.
 106          */
 107         isc_stdtime_get(&now);
 108         start = (isc_int64_t) now;
 109         start -= 0x7fffffff;
 110         base = 0;
 111         while ((t = (base + value)) < start) {
 112                 base += 0x80000000;
 113                 base += 0x80000000;
 114         }
 115         return (dns_time64_totext(t, target));
 116 }
 117
 118 isc_result_t
 119 dns_time64_fromtext(const char *source, isc_int64_t *target) {
 120         int year, month, day, hour, minute, second;
 121         isc_int64_t value;
 122         int secs;
 123         int i;
 124
 125 #define RANGE(min, max, value) \
 126         do { \
 127                 if (value < (min) || value > (max)) \
 128                         return (ISC_R_RANGE); \
 129         } while (0)
 130
 131         if (strlen(source) != 14U)
 132                 return (DNS_R_SYNTAX);
 133         if (sscanf(source, "%4d%2d%2d%2d%2d%2d",
 134                    &year, &month, &day, &hour, &minute, &second) != 6)
 135                 return (DNS_R_SYNTAX);
 136
 137         RANGE(1970, 9999, year);
 138         RANGE(1, 12, month);
 139         RANGE(1, days[month - 1] +
 140                  ((month == 2 && is_leap(year)) ? 1 : 0), day);
 141         RANGE(0, 23, hour);
 142         RANGE(0, 59, minute);
 143         RANGE(0, 60, second);           /* 60 == leap second. */
 144
 145         /*
 146          * Calulate seconds since epoch.
 147          */
 148         value = second + (60 * minute) + (3600 * hour) + ((day - 1) * 86400);
 149         for (i = 0; i < (month - 1); i++)
 150                 value += days[i] * 86400;
 151         if (is_leap(year) && month > 2)
 152                 value += 86400;
 153         for (i = 1970; i < year; i++) {
 154                 secs = (is_leap(i) ? 366 : 365) * 86400;
 155                 value += secs;
 156         }
 157
 158         *target = value;
 159         return (ISC_R_SUCCESS);
 160 }
 161
 162 isc_result_t
 163 dns_time32_fromtext(const char *source, isc_uint32_t *target) {
 164         isc_int64_t value64;
 165         isc_result_t result;
 166         result = dns_time64_fromtext(source, &value64);
 167         if (result != ISC_R_SUCCESS)
 168                 return (result);
 169         *target = (isc_uint32_t)value64;
 170
 171         return (ISC_R_SUCCESS);
 172 }