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    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 1.11 2011/12/13 13:48:41 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 timeval *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: 	/* Time interval, in microseconds */
  108: 	ts->tv_usec = (t % CDF_TIME_PREC) * CDF_TIME_PREC;
  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 timeval *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_usec / CDF_TIME_PREC) * 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)
  170: {
  171: 	static char ctbuf[26];
  172: 	char *ptr = ctime(sec);
  173: 	if (ptr != NULL)
  174: 		return ptr;
  175: 	(void)snprintf(ctbuf, sizeof(ctbuf), "*Bad* 0x%16.16llx\n",
  176: 	    (long long)*sec);
  177: 	return ctbuf;
  178: }
  179: 
  180: 
  181: #ifdef TEST
  182: int
  183: main(int argc, char *argv[])
  184: {
  185: 	struct timeval ts;
  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);
  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