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
35static 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
57struct event *
58schedule(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
95void
96reschedule(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
120void
121unschedule(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
146struct event *
147xsched(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
165void
166xresched(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