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Annotation of Gnu-Mach/i386/dos/dos_gettimeofday.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1995-1994 The University of Utah and
        !             3:  * the Computer Systems Laboratory at the University of Utah (CSL).
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software is hereby
        !             7:  * granted provided that (1) source code retains these copyright, permission,
        !             8:  * and disclaimer notices, and (2) redistributions including binaries
        !             9:  * reproduce the notices in supporting documentation, and (3) all advertising
        !            10:  * materials mentioning features or use of this software display the following
        !            11:  * acknowledgement: ``This product includes software developed by the
        !            12:  * Computer Systems Laboratory at the University of Utah.''
        !            13:  *
        !            14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            17:  *
        !            18:  * CSL requests users of this software to return to [email protected] any
        !            19:  * improvements that they make and grant CSL redistribution rights.
        !            20:  *
        !            21:  *      Author: Bryan Ford, University of Utah CSL
        !            22:  */
        !            23: 
        !            24: #include <unistd.h>
        !            25: #include <errno.h>
        !            26: #include <sys/time.h>
        !            27: 
        !            28: #include "dos_io.h"
        !            29: #include "debug.h"
        !            30: 
        !            31: int dos_gettimeofday(struct timeval *tv, struct timezone *tz)
        !            32: {
        !            33:        static int daysofmonth[12] = {31, 28, 31, 30, 31, 30, 31,
        !            34:                                      31, 30, 31, 30, 31};
        !            35: 
        !            36:        struct real_call_data real_call_data;
        !            37:        int err;
        !            38: 
        !            39:        dos_init_rcd(&real_call_data);
        !            40: 
        !            41:        if (tv)
        !            42:        {
        !            43:                int year, month, day, hour, min, sec, hund;
        !            44: 
        !            45:                real_call_data.eax = 0x2a00;
        !            46:                real_int(0x21, &real_call_data);
        !            47:                year = real_call_data.ecx & 0xffff;
        !            48:                month = (real_call_data.edx >> 8) & 0xff;
        !            49:                day = real_call_data.edx & 0xff;
        !            50:                real_call_data.eax = 0x2c00;
        !            51:                real_int(0x21, &real_call_data);
        !            52:                if (err = dos_check_err(&real_call_data))
        !            53:                        return err;
        !            54: 
        !            55:                hour = (real_call_data.ecx >> 8) & 0xff;
        !            56:                min = real_call_data.ecx & 0xff;
        !            57:                sec = (real_call_data.edx >> 8) & 0xff;
        !            58:                hund = real_call_data.edx & 0xff;
        !            59: 
        !            60:                tv->tv_sec = (year - 1970) * (365 * 24 * 60 * 60);
        !            61:                tv->tv_sec += (year - 1970) / 4 * (24 * 60 * 60); /* XXX??? */
        !            62:                tv->tv_sec += daysofmonth[month-1] * (24 * 60 * 60);
        !            63:                if ((((year - 1970) % 4) == 0) && (month > 2)) /* XXX??? */
        !            64:                        tv->tv_sec += 24 * 60 * 60;
        !            65:                tv->tv_sec += day * 24 * 60 * 60;
        !            66:                tv->tv_sec += hour * 60 * 60;
        !            67:                tv->tv_sec += min * 60;
        !            68:                tv->tv_sec += sec;
        !            69:                tv->tv_usec = hund * (1000000 / 100);
        !            70:        }
        !            71:        if (tz)
        !            72:                return EINVAL; /*XXX*/
        !            73: 
        !            74:        assert(tz == 0);
        !            75:        return 0;
        !            76: }
        !            77: 

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