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-rw-r--r--cpukit/rtems/src/clocktodtoseconds.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/cpukit/rtems/src/clocktodtoseconds.c b/cpukit/rtems/src/clocktodtoseconds.c
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+++ b/cpukit/rtems/src/clocktodtoseconds.c
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+/*
+ * Time of Day (TOD) Handler - Classic TOD to Seconds
+ *
+ * COPYRIGHT (c) 1989-2007.
+ * On-Line Applications Research Corporation (OAR).
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.com/license/LICENSE.
+ *
+ * $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/rtems/clock.h>
+
+/*
+ * The following array contains the number of days in all months
+ * up to the month indicated by the index of the second dimension.
+ * The first dimension should be 1 for leap years, and 0 otherwise.
+ */
+const uint16_t _TOD_Days_to_date[2][13] = {
+ { 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 },
+ { 0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 }
+};
+
+/*
+ * The following array contains the number of days in the years
+ * since the last leap year. The index should be 0 for leap
+ * years, and the number of years since the beginning of a leap
+ * year otherwise.
+ */
+const uint16_t _TOD_Days_since_last_leap_year[4] = { 0, 366, 731, 1096 };
+
+
+
+/*PAGE
+ *
+ * _TOD_To_seconds
+ *
+ * This routine returns the seconds from the epoch until the
+ * current date and time.
+ *
+ * Input parameters:
+ * the_tod - pointer to the time and date structure
+ *
+ * Output parameters:
+ * returns - seconds since epoch until the_tod
+ */
+
+uint32_t _TOD_To_seconds(
+ const rtems_time_of_day *the_tod
+)
+{
+ uint32_t time;
+ uint32_t year_mod_4;
+
+ time = the_tod->day - 1;
+ year_mod_4 = the_tod->year & 3;
+
+ if ( year_mod_4 == 0 )
+ time += _TOD_Days_to_date[ 1 ][ the_tod->month ];
+ else
+ time += _TOD_Days_to_date[ 0 ][ the_tod->month ];
+
+ time += ( (the_tod->year - TOD_BASE_YEAR) / 4 ) *
+ ( (TOD_DAYS_PER_YEAR * 4) + 1);
+
+ time += _TOD_Days_since_last_leap_year[ year_mod_4 ];
+
+ time *= TOD_SECONDS_PER_DAY;
+
+ time += ((the_tod->hour * TOD_MINUTES_PER_HOUR) + the_tod->minute)
+ * TOD_SECONDS_PER_MINUTE;
+
+ time += the_tod->second;
+
+ time += TOD_SECONDS_1970_THROUGH_1988;
+
+ return( time );
+}