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      1 /*	$NetBSD: schedule.c,v 1.12 2022/05/22 11:27:33 andvar Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1980, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)schedule.c	8.1 (Berkeley) 5/31/93";
     36 #else
     37 __RCSID("$NetBSD: schedule.c,v 1.12 2022/05/22 11:27:33 andvar Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <stdio.h>
     42 #include <math.h>
     43 #include <err.h>
     44 #include <limits.h>
     45 #include "trek.h"
     46 
     47 /*
     48 **  SCHEDULE AN EVENT
     49 **
     50 **	An event of type 'type' is scheduled for time NOW + 'offset'
     51 **	into the first available slot.  'x', 'y', and 'z' are
     52 **	considered the attributes for this event.
     53 **
     54 **	The address of the slot is returned.
     55 */
     56 
     57 struct event *
     58 schedule(int type, double offset, int x, int y, int z)
     59 {
     60 	struct event	*e;
     61 	int		i;
     62 	double			date;
     63 
     64 	date = Now.date + offset;
     65 	for (i = 0; i < MAXEVENTS; i++) {
     66 		e = &Event[i];
     67 		if (e->evcode)
     68 			continue;
     69 		/* got a slot */
     70 #ifdef xTRACE
     71 		if (Trace)
     72 			printf("schedule: type %d @ %.2f "
     73 			       "slot %d parm %d %d %d\n",
     74 				type, date, i, x, y, z);
     75 #endif
     76 		e->evcode = type;
     77 		e->date = date;
     78 		e->x = x;
     79 		e->y = y;
     80 		e->systemname = z;
     81 		Now.eventptr[type & ~E_GHOST] = e;
     82 		return (e);
     83 	}
     84 	errx(1, "Cannot schedule event %d parm %d %d %d", type, x, y, z);
     85 }
     86 
     87 
     88 /*
     89 **  RESCHEDULE AN EVENT
     90 **
     91 **	The event pointed to by 'e' is rescheduled to the current
     92 **	time plus 'offset'.
     93 */
     94 
     95 void
     96 reschedule(struct event *e1, double offset)
     97 {
     98 	double			date;
     99 	struct event	*e;
    100 
    101 	e = e1;
    102 
    103 	date = Now.date + offset;
    104 	e->date = date;
    105 #ifdef xTRACE
    106 	if (Trace)
    107 		printf("reschedule: type %d parm %d %d %d @ %.2f\n",
    108 			e->evcode, e->x, e->y, e->systemname, date);
    109 #endif
    110 	return;
    111 }
    112 
    113 
    114 /*
    115 **  UNSCHEDULE AN EVENT
    116 **
    117 **	The event at slot 'e' is deleted.
    118 */
    119 
    120 void
    121 unschedule(struct event *e1)
    122 {
    123 	struct event	*e;
    124 
    125 	e = e1;
    126 
    127 #ifdef xTRACE
    128 	if (Trace)
    129 		printf("unschedule: type %d @ %.2f parm %d %d %d\n",
    130 			e->evcode, e->date, e->x, e->y, e->systemname);
    131 #endif
    132 	Now.eventptr[e->evcode & E_EVENT] = 0;
    133 	e->date = TOOLARGE;
    134 	e->evcode = 0;
    135 	return;
    136 }
    137 
    138 
    139 /*
    140 **  Abbreviated schedule routine
    141 **
    142 **	Parameters are the event index and a factor for the time
    143 **	figure.
    144 */
    145 
    146 struct event *
    147 xsched(int ev1, int factor, int x, int y, int z)
    148 {
    149 	int	ev;
    150 	double when;
    151 
    152 	ev = ev1;
    153 	when = -Param.eventdly[ev] * Param.time * log(franf()) / factor;
    154 	return (schedule(ev, when, x, y, z));
    155 }
    156 
    157 
    158 /*
    159 **  Simplified reschedule routine
    160 **
    161 **	Parameters are the event index, the initial date, and the
    162 **	division factor.  Look at the code to see what really happens.
    163 */
    164 
    165 void
    166 xresched(struct event *e1, int ev1, int factor)
    167 {
    168 	int		ev;
    169 	struct event	*e;
    170 	double when;
    171 
    172 	ev = ev1;
    173 	e = e1;
    174 	when = -Param.eventdly[ev] * Param.time * log(franf()) / factor;
    175 	reschedule(e, when);
    176 }
    177