contrib/bind-9.5.2/lib/dns/time.c

   1 /*
   2  * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 1998-2003  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or 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 1.31.128.2 2009/01/19 23:47:02 tbox Exp $ */
  19
  20 /*! \file */
  21
  22 #include <config.h>
  23
  24 #include <stdio.h>
  25 #include <isc/string.h>         /* Required for HP/UX (and others?) */
  26 #include <time.h>
  27
  28 #include <isc/print.h>
  29 #include <isc/region.h>
  30 #include <isc/stdtime.h>
  31 #include <isc/util.h>
  32
  33 #include <dns/result.h>
  34 #include <dns/time.h>
  35
  36 static int days[12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  37
  38 isc_result_t
  39 dns_time64_totext(isc_int64_t t, isc_buffer_t *target) {
  40         struct tm tm;
  41         char buf[sizeof("YYYYMMDDHHMMSS")];
  42         int secs;
  43         unsigned int l;
  44         isc_region_t region;
  45
  46         REQUIRE(t >= 0);
  47
  48 #define is_leap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  49 #define year_secs(y) ((is_leap(y) ? 366 : 365 ) * 86400)
  50 #define month_secs(m,y) ((days[m] + ((m == 1 && is_leap(y)) ? 1 : 0 )) * 86400)
  51
  52         tm.tm_year = 70;
  53         while ((secs = year_secs(tm.tm_year + 1900)) <= t) {
  54                 t -= secs;
  55                 tm.tm_year++;
  56                 if (tm.tm_year + 1900 > 9999)
  57                         return (ISC_R_RANGE);
  58         }
  59         tm.tm_mon = 0;
  60         while ((secs = month_secs(tm.tm_mon, tm.tm_year + 1900)) <= t) {
  61                 t -= secs;
  62                 tm.tm_mon++;
  63         }
  64         tm.tm_mday = 1;
  65         while (86400 <= t) {
  66                 t -= 86400;
  67                 tm.tm_mday++;
  68         }
  69         tm.tm_hour = 0;
  70         while (3600 <= t) {
  71                 t -= 3600;
  72                 tm.tm_hour++;
  73         }
  74         tm.tm_min = 0;
  75         while (60 <= t) {
  76                 t -= 60;
  77                 tm.tm_min++;
  78         }
  79         tm.tm_sec = (int)t;
  80                                  /* yyyy  mm  dd  HH  MM  SS */
  81         snprintf(buf, sizeof(buf), "%04d%02d%02d%02d%02d%02d",
  82                  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
  83                  tm.tm_hour, tm.tm_min, tm.tm_sec);
  84
  85         isc_buffer_availableregion(target, &region);
  86         l = strlen(buf);
  87
  88         if (l > region.length)
  89                 return (ISC_R_NOSPACE);
  90
  91         memcpy(region.base, buf, l);
  92         isc_buffer_add(target, l);
  93         return (ISC_R_SUCCESS);
  94 }
  95
  96 isc_result_t
  97 dns_time32_totext(isc_uint32_t value, isc_buffer_t *target) {
  98         isc_stdtime_t now;
  99         isc_int64_t start;
 100         isc_int64_t base;
 101         isc_int64_t t;
 102
 103         /*
 104          * Adjust the time to the closest epoch.  This should be changed
 105          * to use a 64-bit counterpart to isc_stdtime_get() if one ever
 106          * is defined, but even the current code is good until the year
 107          * 2106.
 108          */
 109         isc_stdtime_get(&now);
 110         start = (isc_int64_t) now;
 111         start -= 0x7fffffff;
 112         base = 0;
 113         while ((t = (base + value)) < start) {
 114                 base += 0x80000000;
 115                 base += 0x80000000;
 116         }
 117         return (dns_time64_totext(t, target));
 118 }
 119
 120 isc_result_t
 121 dns_time64_fromtext(const char *source, isc_int64_t *target) {
 122         int year, month, day, hour, minute, second;
 123         isc_int64_t value;
 124         int secs;
 125         int i;
 126
 127 #define RANGE(min, max, value) \
 128         do { \
 129                 if (value < (min) || value > (max)) \
 130                         return (ISC_R_RANGE); \
 131         } while (0)
 132
 133         if (strlen(source) != 14U)
 134                 return (DNS_R_SYNTAX);
 135         if (sscanf(source, "%4d%2d%2d%2d%2d%2d",
 136                    &year, &month, &day, &hour, &minute, &second) != 6)
 137                 return (DNS_R_SYNTAX);
 138
 139         RANGE(1970, 9999, year);
 140         RANGE(1, 12, month);
 141         RANGE(1, days[month - 1] +
 142                  ((month == 2 && is_leap(year)) ? 1 : 0), day);
 143         RANGE(0, 23, hour);
 144         RANGE(0, 59, minute);
 145         RANGE(0, 60, second);           /* 60 == leap second. */
 146
 147         /*
 148          * Calculate seconds since epoch.
 149          */
 150         value = second + (60 * minute) + (3600 * hour) + ((day - 1) * 86400);
 151         for (i = 0; i < (month - 1); i++)
 152                 value += days[i] * 86400;
 153         if (is_leap(year) && month > 2)
 154                 value += 86400;
 155         for (i = 1970; i < year; i++) {
 156                 secs = (is_leap(i) ? 366 : 365) * 86400;
 157                 value += secs;
 158         }
 159
 160         *target = value;
 161         return (ISC_R_SUCCESS);
 162 }
 163
 164 isc_result_t
 165 dns_time32_fromtext(const char *source, isc_uint32_t *target) {
 166         isc_int64_t value64;
 167         isc_result_t result;
 168         result = dns_time64_fromtext(source, &value64);
 169         if (result != ISC_R_SUCCESS)
 170                 return (result);
 171         *target = (isc_uint32_t)value64;
 172
 173         return (ISC_R_SUCCESS);
 174 }