4.3BSD - /usr/src/games/trek/schedule.c

   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: }

Defined functions

Defined variables