/*
 * Copyright (c) 1992, 1993, 1996
 *	Berkeley Software Design, Inc.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by Berkeley Software
 *	Design, Inc.
 *
 * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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.
 *
 *	BSDI int1a.c,v 2.2 1996/04/08 19:32:49 bostic Exp
 */

#include "doscmd.h"

static inline int
to_BCD (int n)
{
    n &= 0xFF;
    return n%10 + ((n/10)<<4);
}

void
int1a(struct sigcontext *sc)
{
	struct	timeval	tod;
	struct	timezone zone;
	struct	tm *tm;
	long	value;
	static long midnight = 0;

        sc->sc_eflags &= ~PSL_C;

	switch (GET8H(sc->sc_eax)) {
	case 0x00:
		gettimeofday(&tod, &zone);

		if (midnight == 0) {
		    tm = localtime(&boot_time.tv_sec);
		    midnight = boot_time.tv_sec - (((tm->tm_hour * 60)
					           + tm->tm_min) * 60
						   + tm->tm_sec);
		}

		SET8L(sc->sc_eax, (tod.tv_sec - midnight) / (24 * 60 * 60));

		if (GET8L(sc->sc_eax)) {
		    tm = localtime(&boot_time.tv_sec);
		    midnight = boot_time.tv_sec - (((tm->tm_hour * 60)
					           + tm->tm_min) * 60
						   + tm->tm_sec);
		}

		tod.tv_sec -= midnight;
		tod.tv_usec -= boot_time.tv_usec;

		value = (tod.tv_sec * 182 + tod.tv_usec / (1000000L/182)) / 10;
		SET16(sc->sc_ecx, value >> 16);
		SET16(sc->sc_edx, value);
		break;

	case 0x02:
		gettimeofday(&tod, &zone);
		tm = localtime(&tod.tv_sec);
		SET8H(sc->sc_ecx, to_BCD(tm->tm_hour));
		SET8L(sc->sc_ecx, to_BCD(tm->tm_min));
		SET8H(sc->sc_edx, to_BCD(tm->tm_sec));
		break;

	case 0x04:
		gettimeofday(&tod, &zone);
		tm = localtime(&tod.tv_sec);
		SET8H(sc->sc_ecx, to_BCD((tm->tm_year + 1900) / 100));
		SET8L(sc->sc_ecx, to_BCD((tm->tm_year + 1900) % 100));
		SET8H(sc->sc_edx, to_BCD(tm->tm_mon + 1));
		SET8L(sc->sc_edx, to_BCD(tm->tm_mday));
		break;

	default:
		unknown_int2(0x1a, GET8H(sc->sc_eax), sc);
		break;
	}
}