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Annotation of 43BSDTahoe/games/trek/schedule.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)schedule.c 5.3 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: # include      "trek.h"
        !            23: 
        !            24: /*
        !            25: **  SCHEDULE AN EVENT
        !            26: **
        !            27: **     An event of type 'type' is scheduled for time NOW + 'offset'
        !            28: **     into the first available slot.  'x', 'y', and 'z' are
        !            29: **     considered the attributes for this event.
        !            30: **
        !            31: **     The address of the slot is returned.
        !            32: */
        !            33: 
        !            34: struct event *schedule(type, offset, x, y, z)
        !            35: int    type;
        !            36: double offset;
        !            37: char   x, y;
        !            38: char   z;
        !            39: {
        !            40:        register struct event   *e;
        !            41:        register int            i;
        !            42:        double                  date;
        !            43: 
        !            44:        date = Now.date + offset;
        !            45:        for (i = 0; i < MAXEVENTS; i++)
        !            46:        {
        !            47:                e = &Event[i];
        !            48:                if (e->evcode)
        !            49:                        continue;
        !            50:                /* got a slot */
        !            51: #              ifdef xTRACE
        !            52:                if (Trace)
        !            53:                        printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
        !            54:                                type, date, i, x, y, z);
        !            55: #              endif
        !            56:                e->evcode = type;
        !            57:                e->date = date;
        !            58:                e->x = x;
        !            59:                e->y = y;
        !            60:                e->systemname = z;
        !            61:                Now.eventptr[type] = e;
        !            62:                return (e);
        !            63:        }
        !            64:        syserr("Cannot schedule event %d parm %d %d %d", type, x, y, z);
        !            65: }
        !            66: 
        !            67: 
        !            68: /*
        !            69: **  RESCHEDULE AN EVENT
        !            70: **
        !            71: **     The event pointed to by 'e' is rescheduled to the current
        !            72: **     time plus 'offset'.
        !            73: */
        !            74: 
        !            75: reschedule(e1, offset)
        !            76: struct event   *e1;
        !            77: double         offset;
        !            78: {
        !            79:        double                  date;
        !            80:        register struct event   *e;
        !            81: 
        !            82:        e = e1;
        !            83: 
        !            84:        date = Now.date + offset;
        !            85:        e->date = date;
        !            86: #      ifdef xTRACE
        !            87:        if (Trace)
        !            88:                printf("reschedule: type %d parm %d %d %d @ %.2f\n",
        !            89:                        e->evcode, e->x, e->y, e->systemname, date);
        !            90: #      endif
        !            91:        return;
        !            92: }
        !            93: 
        !            94: 
        !            95: /*
        !            96: **  UNSCHEDULE AN EVENT
        !            97: **
        !            98: **     The event at slot 'e' is deleted.
        !            99: */
        !           100: 
        !           101: unschedule(e1)
        !           102: struct event   *e1;
        !           103: {
        !           104:        register struct event   *e;
        !           105: 
        !           106:        e = e1;
        !           107: 
        !           108: #      ifdef xTRACE
        !           109:        if (Trace)
        !           110:                printf("unschedule: type %d @ %.2f parm %d %d %d\n",
        !           111:                        e->evcode, e->date, e->x, e->y, e->systemname);
        !           112: #      endif
        !           113:        Now.eventptr[e->evcode & E_EVENT] = 0;
        !           114:        e->date = 1e50;
        !           115:        e->evcode = 0;
        !           116:        return;
        !           117: }
        !           118: 
        !           119: 
        !           120: /*
        !           121: **  Abreviated schedule routine
        !           122: **
        !           123: **     Parameters are the event index and a factor for the time
        !           124: **     figure.
        !           125: */
        !           126: 
        !           127: struct event *xsched(ev1, factor, x, y, z)
        !           128: int    ev1;
        !           129: int    factor;
        !           130: int    x, y, z;
        !           131: {
        !           132:        register int    ev;
        !           133: 
        !           134:        ev = ev1;
        !           135:        return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
        !           136: }
        !           137: 
        !           138: 
        !           139: /*
        !           140: **  Simplified reschedule routine
        !           141: **
        !           142: **     Parameters are the event index, the initial date, and the
        !           143: **     division factor.  Look at the code to see what really happens.
        !           144: */
        !           145: 
        !           146: xresched(e1, ev1, factor)
        !           147: struct event   *e1;
        !           148: int            ev1;
        !           149: int            factor;
        !           150: {
        !           151:        register int            ev;
        !           152:        register struct event   *e;
        !           153: 
        !           154:        ev = ev1;
        !           155:        e = e1;
        !           156:        reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
        !           157: }

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