contrib/file/src/cdf_time.c

   1 /*-
   2  * Copyright (c) 2008 Christos Zoulas
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  15  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  16  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  18  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  19  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  20  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  21  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  22  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  23  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  24  * POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "file.h"
  28
  29 #ifndef lint
  30 FILE_RCSID("@(#)$File: cdf_time.c,v 1.15 2014/05/14 23:15:42 christos Exp $")
  31 #endif
  32
  33 #include <time.h>
  34 #ifdef TEST
  35 #include <err.h>
  36 #endif
  37 #include <string.h>
  38
  39 #include "cdf.h"
  40
  41 #define isleap(y) ((((y) % 4) == 0) && \
  42     ((((y) % 100) != 0) || (((y) % 400) == 0)))
  43
  44 static const int mdays[] = {
  45     31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
  46 };
  47
  48 /*
  49  * Return the number of days between jan 01 1601 and jan 01 of year.
  50  */
  51 static int
  52 cdf_getdays(int year)
  53 {
  54         int days = 0;
  55         int y;
  56
  57         for (y = CDF_BASE_YEAR; y < year; y++)
  58                 days += isleap(y) + 365;
  59
  60         return days;
  61 }
  62
  63 /*
  64  * Return the day within the month
  65  */
  66 static int
  67 cdf_getday(int year, int days)
  68 {
  69         size_t m;
  70
  71         for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
  72                 int sub = mdays[m] + (m == 1 && isleap(year));
  73                 if (days < sub)
  74                         return days;
  75                 days -= sub;
  76         }
  77         return days;
  78 }
  79
  80 /*
  81  * Return the 0...11 month number.
  82  */
  83 static int
  84 cdf_getmonth(int year, int days)
  85 {
  86         size_t m;
  87
  88         for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
  89                 days -= mdays[m];
  90                 if (m == 1 && isleap(year))
  91                         days--;
  92                 if (days <= 0)
  93                         return (int)m;
  94         }
  95         return (int)m;
  96 }
  97
  98 int
  99 cdf_timestamp_to_timespec(struct timespec *ts, cdf_timestamp_t t)
 100 {
 101         struct tm tm;
 102 #ifdef HAVE_STRUCT_TM_TM_ZONE
 103         static char UTC[] = "UTC";
 104 #endif
 105         int rdays;
 106
 107         /* Unit is 100's of nanoseconds */
 108         ts->tv_nsec = (t % CDF_TIME_PREC) * 100;
 109
 110         t /= CDF_TIME_PREC;
 111         tm.tm_sec = (int)(t % 60);
 112         t /= 60;
 113
 114         tm.tm_min = (int)(t % 60);
 115         t /= 60;
 116
 117         tm.tm_hour = (int)(t % 24);
 118         t /= 24;
 119
 120         /* XXX: Approx */
 121         tm.tm_year = (int)(CDF_BASE_YEAR + (t / 365));
 122
 123         rdays = cdf_getdays(tm.tm_year);
 124         t -= rdays - 1;
 125         tm.tm_mday = cdf_getday(tm.tm_year, (int)t);
 126         tm.tm_mon = cdf_getmonth(tm.tm_year, (int)t);
 127         tm.tm_wday = 0;
 128         tm.tm_yday = 0;
 129         tm.tm_isdst = 0;
 130 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
 131         tm.tm_gmtoff = 0;
 132 #endif
 133 #ifdef HAVE_STRUCT_TM_TM_ZONE
 134         tm.tm_zone = UTC;
 135 #endif
 136         tm.tm_year -= 1900;
 137         ts->tv_sec = mktime(&tm);
 138         if (ts->tv_sec == -1) {
 139                 errno = EINVAL;
 140                 return -1;
 141         }
 142         return 0;
 143 }
 144
 145 int
 146 /*ARGSUSED*/
 147 cdf_timespec_to_timestamp(cdf_timestamp_t *t, const struct timespec *ts)
 148 {
 149 #ifndef __lint__
 150         (void)&t;
 151         (void)&ts;
 152 #endif
 153 #ifdef notyet
 154         struct tm tm;
 155         if (gmtime_r(&ts->ts_sec, &tm) == NULL) {
 156                 errno = EINVAL;
 157                 return -1;
 158         }
 159         *t = (ts->ts_nsec / 100) * CDF_TIME_PREC;
 160         *t = tm.tm_sec;
 161         *t += tm.tm_min * 60;
 162         *t += tm.tm_hour * 60 * 60;
 163         *t += tm.tm_mday * 60 * 60 * 24;
 164 #endif
 165         return 0;
 166 }
 167
 168 char *
 169 cdf_ctime(const time_t *sec, char *buf)
 170 {
 171         char *ptr = ctime_r(sec, buf);
 172         if (ptr != NULL)
 173                 return buf;
 174         (void)snprintf(buf, 26, "*Bad* 0x%16.16" INT64_T_FORMAT "x\n",
 175             (long long)*sec);
 176         return buf;
 177 }
 178
 179
 180 #ifdef TEST_TIME
 181 int
 182 main(int argc, char *argv[])
 183 {
 184         struct timespec ts;
 185         char buf[25];
 186         static const cdf_timestamp_t tst = 0x01A5E403C2D59C00ULL;
 187         static const char *ref = "Sat Apr 23 01:30:00 1977";
 188         char *p, *q;
 189
 190         cdf_timestamp_to_timespec(&ts, tst);
 191         p = cdf_ctime(&ts.tv_sec, buf);
 192         if ((q = strchr(p, '\n')) != NULL)
 193                 *q = '\0';
 194         if (strcmp(ref, p) != 0)
 195                 errx(1, "Error date %s != %s\n", ref, p);
 196         return 0;
 197 }
 198 #endif