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-rw-r--r--cdf_time.c182
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+/*-
+ * Copyright (c) 2008 Christos Zoulas
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "file.h"
+
+#ifndef lint
+FILE_RCSID("@(#)$File: cdf_time.c,v 1.5 2009/02/03 20:27:51 christos Exp $")
+#endif
+
+#include <time.h>
+#ifdef TEST
+#include <err.h>
+#endif
+#include <string.h>
+
+#include "cdf.h"
+
+#define isleap(y) ((((y) % 4) == 0) && \
+ ((((y) % 100) != 0) || (((y) % 400) == 0)))
+
+static const int mdays[] = {
+ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+/*
+ * Return the number of days between jan 01 1601 and jan 01 of year.
+ */
+static int
+cdf_getdays(int year)
+{
+ int days = 0;
+ int y;
+
+ for (y = CDF_BASE_YEAR; y < year; y++)
+ days += isleap(y) + 365;
+
+ return days;
+}
+
+/*
+ * Return the day within the month
+ */
+static int
+cdf_getday(int year, int days)
+{
+ size_t m;
+
+ for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
+ int sub = mdays[m] + (m == 1 && isleap(year));
+ if (days < sub)
+ return days;
+ days -= sub;
+ }
+ return days;
+}
+
+/*
+ * Return the 0...11 month number.
+ */
+static int
+cdf_getmonth(int year, int days)
+{
+ size_t m;
+
+ for (m = 0; m < sizeof(mdays) / sizeof(mdays[0]); m++) {
+ days -= mdays[m];
+ if (m == 1 && isleap(year))
+ days--;
+ if (days <= 0)
+ return (int)m;
+ }
+ return (int)m;
+}
+
+int
+cdf_timestamp_to_timespec(struct timespec *ts, cdf_timestamp_t t)
+{
+ struct tm tm;
+#ifdef HAVE_STRUCT_TM_TM_ZONE
+ static char UTC[] = "UTC";
+#endif
+
+ /* Unit is 100's of nanoseconds */
+ ts->tv_nsec = (t % CDF_TIME_PREC) * 100;
+
+ t /= CDF_TIME_PREC;
+ tm.tm_sec = t % 60;
+ t /= 60;
+
+ tm.tm_min = t % 60;
+ t /= 60;
+
+ tm.tm_hour = t % 24;
+ t /= 24;
+
+ // XXX: Approx
+ tm.tm_year = CDF_BASE_YEAR + (t / 365);
+
+ int rdays = cdf_getdays(tm.tm_year);
+ t -= rdays;
+ tm.tm_mday = cdf_getday(tm.tm_year, t);
+ tm.tm_mon = cdf_getmonth(tm.tm_year, t);
+ tm.tm_wday = 0;
+ tm.tm_yday = 0;
+ tm.tm_isdst = 0;
+#ifdef HAVE_STRUCT_TM_TM_GMTOFF
+ tm.tm_gmtoff = 0;
+#endif
+#ifdef HAVE_STRUCT_TM_TM_ZONE
+ tm.tm_zone = UTC;
+#endif
+ tm.tm_year -= 1900;
+ ts->tv_sec = mktime(&tm);
+ if (ts->tv_sec == -1) {
+ errno = EINVAL;
+ return -1;
+ }
+ return 0;
+}
+
+int
+cdf_timespec_to_timestamp(cdf_timestamp_t *t, const struct timespec *ts)
+{
+ (void)&t;
+ (void)&ts;
+#ifdef notyet
+ struct tm tm;
+ if (gmtime_r(&ts->ts_sec, &tm) == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+ *t = (ts->ts_nsec / 100) * CDF_TIME_PREC;
+ *t = tm.tm_sec;
+ *t += tm.tm_min * 60;
+ *t += tm.tm_hour * 60 * 60;
+ *t += tm.tm_mday * 60 * 60 * 24;
+#endif
+ return 0;
+}
+
+
+#ifdef TEST
+int
+main(int argc, char *argv[])
+{
+ struct timespec ts;
+ static const cdf_timestamp_t tst = 0x01A5E403C2D59C00ULL;
+ static const char *ref = "Sat Apr 23 01:30:00 1977";
+ char *p, *q;
+
+ cdf_timestamp_to_timespec(&ts, tst);
+ p = ctime(&ts.tv_sec);
+ if ((q = strchr(p, '\n')) != NULL)
+ *q = '\0';
+ if (strcmp(ref, p) != 0)
+ errx(1, "Error date %s != %s\n", ref, p);
+ return 0;
+}
+#endif