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Annotation of 43BSDTahoe/games/trek/schedule.c, revision 1.1.1.1

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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