1/*	$OpenBSD: schedule.c,v 1.8 2016/01/07 14:37:51 mestre Exp $	*/
2/*	$NetBSD: schedule.c,v 1.3 1995/04/22 10:59:23 cgd Exp $	*/
3
4/*
5 * Copyright (c) 1980, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <err.h>
34#include <math.h>
35#include <stdio.h>
36
37#include "trek.h"
38
39/*
40**  SCHEDULE AN EVENT
41**
42**	An event of type 'type' is scheduled for time NOW + 'offset'
43**	into the first available slot.  'x', 'y', and 'z' are
44**	considered the attributes for this event.
45**
46**	The address of the slot is returned.
47*/
48
49struct event *
50schedule(int type, double offset, int x, int y, int z)
51{
52	struct event	*e;
53	int		i;
54	double		date;
55
56	date = Now.date + offset;
57	for (i = 0; i < MAXEVENTS; i++)
58	{
59		e = &Event[i];
60		if (e->evcode)
61			continue;
62		/* got a slot */
63#		ifdef xTRACE
64		if (Trace)
65			printf("schedule: type %d @ %.2f slot %d parm %d %d %d\n",
66				type, date, i, x, y, z);
67#		endif
68		e->evcode = type;
69		e->date = date;
70		e->x = x;
71		e->y = y;
72		e->systemname = z;
73		Now.eventptr[type & E_EVENT] = e;
74		return (e);
75	}
76	errx(1, "Cannot schedule event %d parm %d %d %d", type, x, y, z);
77}
78
79
80/*
81**  RESCHEDULE AN EVENT
82**
83**	The event pointed to by 'e' is rescheduled to the current
84**	time plus 'offset'.
85*/
86
87void
88reschedule(struct event *e1, double offset)
89{
90	double		date;
91	struct event	*e;
92
93	e = e1;
94
95	date = Now.date + offset;
96	e->date = date;
97#	ifdef xTRACE
98	if (Trace)
99		printf("reschedule: type %d parm %d %d %d @ %.2f\n",
100			e->evcode, e->x, e->y, e->systemname, date);
101#	endif
102	return;
103}
104
105
106/*
107**  UNSCHEDULE AN EVENT
108**
109**	The event at slot 'e' is deleted.
110*/
111
112void
113unschedule(struct event *e1)
114{
115	struct event	*e;
116
117	e = e1;
118
119#	ifdef xTRACE
120	if (Trace)
121		printf("unschedule: type %d @ %.2f parm %d %d %d\n",
122			e->evcode, e->date, e->x, e->y, e->systemname);
123#	endif
124	Now.eventptr[e->evcode & E_EVENT] = 0;
125	e->date = 1e50;
126	e->evcode = 0;
127	return;
128}
129
130
131/*
132**  Abreviated schedule routine
133**
134**	Parameters are the event index and a factor for the time
135**	figure.
136*/
137
138struct event *
139xsched(int ev1, int factor, int x, int y, int z)
140{
141	int	ev;
142
143	ev = ev1;
144	return (schedule(ev, -Param.eventdly[ev] * Param.time * log(franf()) / factor, x, y, z));
145}
146
147
148/*
149**  Simplified reschedule routine
150**
151**	Parameters are the event index, the initial date, and the
152**	division factor.  Look at the code to see what really happens.
153*/
154
155void
156xresched(struct event *e1, int ev1, int factor)
157{
158	int		ev;
159	struct event	*e;
160
161	ev = ev1;
162	e = e1;
163	reschedule(e, -Param.eventdly[ev] * Param.time * log(franf()) / factor);
164}
165