games/trek/schedule.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)schedule.c       8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/trek/schedule.c,v 1.4 1999/11/30 03:49:53 billf Exp $
  35  * $DragonFly: src/games/trek/schedule.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
  36  */
  37
  38 # include       "trek.h"
  39
  40 /*
  41 **  SCHEDULE AN EVENT
  42 **
  43 **      An event of type 'type' is scheduled for time NOW + 'offset'
  44 **      into the first available slot.  'x', 'y', and 'z' are
  45 **      considered the attributes for this event.
  46 **
  47 **      The address of the slot is returned.
  48 */
  49
  50 struct event *
  51 schedule(int type, double offset, char x, char y, char z)
  52 {
  53         struct event    *e;
  54         int             i;
  55         double                  date;
  56
  57         date = Now.date + offset;
  58         for (i = 0; i < MAXEVENTS; i++)
  59         {
  60                 e = &Event[i];
  61                 if (e->evcode)
  62                         continue;
  63                 /* got a slot */
  64 #               ifdef xTRACE
  65                 if (Trace)
  66                         printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
  67                                 type, date, i, x, y, z);
  68 #               endif
  69                 e->evcode = type;
  70                 e->date = date;
  71                 e->x = x;
  72                 e->y = y;
  73                 e->systemname = z;
  74                 Now.eventptr[type] = e;
  75                 return (e);
  76         }
  77         syserr("Cannot schedule event %d parm %d %d %d", type, x, y, z);
  78         /* NOTREACHED */
  79         return(NULL);
  80 }
  81
  82
  83 /*
  84 **  RESCHEDULE AN EVENT
  85 **
  86 **      The event pointed to by 'e' is rescheduled to the current
  87 **      time plus 'offset'.
  88 */
  89
  90 void
  91 reschedule(struct event *e1, double offset)
  92 {
  93         double                  date;
  94         struct event    *e;
  95
  96         e = e1;
  97
  98         date = Now.date + offset;
  99         e->date = date;
 100 #       ifdef xTRACE
 101         if (Trace)
 102                 printf("reschedule: type %d parm %d %d %d @ %.2f\n",
 103                         e->evcode, e->x, e->y, e->systemname, date);
 104 #       endif
 105         return;
 106 }
 107
 108
 109 /*
 110 **  UNSCHEDULE AN EVENT
 111 **
 112 **      The event at slot 'e' is deleted.
 113 */
 114
 115 void
 116 unschedule(struct event *e1)
 117 {
 118         struct event    *e;
 119
 120         e = e1;
 121
 122 #       ifdef xTRACE
 123         if (Trace)
 124                 printf("unschedule: type %d @ %.2f parm %d %d %d\n",
 125                         e->evcode, e->date, e->x, e->y, e->systemname);
 126 #       endif
 127         Now.eventptr[e->evcode & E_EVENT] = 0;
 128         e->date = 1e50;
 129         e->evcode = 0;
 130         return;
 131 }
 132
 133
 134 /*
 135 **  Abreviated schedule routine
 136 **
 137 **      Parameters are the event index and a factor for the time
 138 **      figure.
 139 */
 140
 141 struct event *
 142 xsched(int ev1, int factor, int x, int y, int z)
 143 {
 144         int     ev;
 145
 146         ev = ev1;
 147         return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
 148 }
 149
 150
 151 /*
 152 **  Simplified reschedule routine
 153 **
 154 **      Parameters are the event index, the initial date, and the
 155 **      division factor.  Look at the code to see what really happens.
 156 */
 157
 158 void
 159 xresched(struct event *e1, int ev1, int factor)
 160 {
 161         int             ev;
 162         struct event    *e;
 163
 164         ev = ev1;
 165         e = e1;
 166         reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
 167 }