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Annotation of 43BSD/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.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)schedule.c 5.1 (Berkeley) 5/30/85";
        !             9: #endif not lint
        !            10: 
        !            11: # include      "trek.h"
        !            12: 
        !            13: /*
        !            14: **  SCHEDULE AN EVENT
        !            15: **
        !            16: **     An event of type 'type' is scheduled for time NOW + 'offset'
        !            17: **     into the first available slot.  'x', 'y', and 'z' are
        !            18: **     considered the attributes for this event.
        !            19: **
        !            20: **     The address of the slot is returned.
        !            21: */
        !            22: 
        !            23: struct event *schedule(type, offset, x, y, z)
        !            24: int    type;
        !            25: double offset;
        !            26: char   x, y;
        !            27: char   z;
        !            28: {
        !            29:        register struct event   *e;
        !            30:        register int            i;
        !            31:        double                  date;
        !            32: 
        !            33:        date = Now.date + offset;
        !            34:        for (i = 0; i < MAXEVENTS; i++)
        !            35:        {
        !            36:                e = &Event[i];
        !            37:                if (e->evcode)
        !            38:                        continue;
        !            39:                /* got a slot */
        !            40: #              ifdef xTRACE
        !            41:                if (Trace)
        !            42:                        printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
        !            43:                                type, date, i, x, y, z);
        !            44: #              endif
        !            45:                e->evcode = type;
        !            46:                e->date = date;
        !            47:                e->x = x;
        !            48:                e->y = y;
        !            49:                e->systemname = z;
        !            50:                Now.eventptr[type] = e;
        !            51:                return (e);
        !            52:        }
        !            53:        syserr("Cannot schedule event %d parm %d %d %d", type, x, y, z);
        !            54: }
        !            55: 
        !            56: 
        !            57: /*
        !            58: **  RESCHEDULE AN EVENT
        !            59: **
        !            60: **     The event pointed to by 'e' is rescheduled to the current
        !            61: **     time plus 'offset'.
        !            62: */
        !            63: 
        !            64: reschedule(e1, offset)
        !            65: struct event   *e1;
        !            66: double         offset;
        !            67: {
        !            68:        double                  date;
        !            69:        register struct event   *e;
        !            70: 
        !            71:        e = e1;
        !            72: 
        !            73:        date = Now.date + offset;
        !            74:        e->date = date;
        !            75: #      ifdef xTRACE
        !            76:        if (Trace)
        !            77:                printf("reschedule: type %d parm %d %d %d @ %.2f\n",
        !            78:                        e->evcode, e->x, e->y, e->systemname, date);
        !            79: #      endif
        !            80:        return;
        !            81: }
        !            82: 
        !            83: 
        !            84: /*
        !            85: **  UNSCHEDULE AN EVENT
        !            86: **
        !            87: **     The event at slot 'e' is deleted.
        !            88: */
        !            89: 
        !            90: unschedule(e1)
        !            91: struct event   *e1;
        !            92: {
        !            93:        register struct event   *e;
        !            94: 
        !            95:        e = e1;
        !            96: 
        !            97: #      ifdef xTRACE
        !            98:        if (Trace)
        !            99:                printf("unschedule: type %d @ %.2f parm %d %d %d\n",
        !           100:                        e->evcode, e->date, e->x, e->y, e->systemname);
        !           101: #      endif
        !           102:        Now.eventptr[e->evcode & E_EVENT] = 0;
        !           103:        e->date = 1e50;
        !           104:        e->evcode = 0;
        !           105:        return;
        !           106: }
        !           107: 
        !           108: 
        !           109: /*
        !           110: **  Abreviated schedule routine
        !           111: **
        !           112: **     Parameters are the event index and a factor for the time
        !           113: **     figure.
        !           114: */
        !           115: 
        !           116: struct event *xsched(ev1, factor, x, y, z)
        !           117: int    ev1;
        !           118: int    factor;
        !           119: int    x, y, z;
        !           120: {
        !           121:        register int    ev;
        !           122: 
        !           123:        ev = ev1;
        !           124:        return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
        !           125: }
        !           126: 
        !           127: 
        !           128: /*
        !           129: **  Simplified reschedule routine
        !           130: **
        !           131: **     Parameters are the event index, the initial date, and the
        !           132: **     division factor.  Look at the code to see what really happens.
        !           133: */
        !           134: 
        !           135: xresched(e1, ev1, factor)
        !           136: struct event   *e1;
        !           137: int            ev1;
        !           138: int            factor;
        !           139: {
        !           140:        register int            ev;
        !           141:        register struct event   *e;
        !           142: 
        !           143:        ev = ev1;
        !           144:        e = e1;
        !           145:        reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
        !           146: }

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