NetBSD/games/sail/dr_2.c

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/* $NetBSD: dr_2.c,v 1.25 2009/03/14 22:52:52 dholland Exp $ */
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/*
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* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
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#ifndef lint
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#if 0
static char sccsid[] = "@(#)dr_2.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: dr_2.c,v 1.25 2009/03/14 22:52:52 dholland Exp $");
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#endif
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#endif /* not lint */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "extern.h"
#include "driver.h"
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#define couldwin(f,t) (f->specs->crew2 > t->specs->crew2 * 1.5)
static int str_end(const char *);
static int score(struct ship *, struct ship *, char *, size_t, int);
static void move_ship(struct ship *, const char *, unsigned char *,
short *, short *, int *);
static void try(struct ship *f, struct ship *t,
char *command, size_t commandmax, char *temp, size_t tempmax,
int ma, int ta, bool af, int vma, int dir, int *high,
int rakeme);
static void rmend(char *);
const int dtab[] = {0,1,1,2,3,4,4,5}; /* diagonal distances in x==y */
void
thinkofgrapples(void)
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{
struct ship *sp, *sq;
bool friendly;
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foreachship(sp) {
if (sp->file->captain[0] || sp->file->dir == 0)
continue;
foreachship(sq) {
friendly = sp->nationality == capship(sq)->nationality;
if (!friendly) {
if (sp->file->struck || sp->file->captured != 0)
continue;
if (range(sp, sq) != 1)
continue;
if (grappled2(sp, sq)) {
if (is_toughmelee(sp, sq, 0, 0))
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ungrap(sp, sq);
else
grap(sp, sq);
} else if (couldwin(sp, sq)) {
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grap(sp, sq);
sp->file->loadwith = L_GRAPE;
}
} else
ungrap(sp, sq);
}
}
}
void
checkup(void)
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{
struct ship *sp, *sq;
char explode, sink;
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foreachship(sp) {
if (sp->file->dir == 0)
continue;
explode = sp->file->explode;
sink = sp->file->sink;
if (explode != 1 && sink != 1)
continue;
if (dieroll() < 5)
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continue;
if (sink == 1) {
send_sink(sp, 2);
} else {
send_explode(sp, 2);
}
send_dir(sp, 0);
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if (snagged(sp))
foreachship(sq)
cleansnag(sp, sq, 1);
if (sink != 1) {
makemsg(sp, "exploding!");
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foreachship(sq) {
if (sp != sq && sq->file->dir &&
range(sp, sq) < 4)
table(sp, sq, RIGGING, L_EXPLODE,
sp->specs->guns/13, 6);
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}
} else {
makemsg(sp, "sinking!");
}
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}
}
void
prizecheck(void)
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{
struct ship *sp;
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foreachship(sp) {
if (sp->file->captured == 0)
continue;
if (sp->file->struck || sp->file->dir == 0)
continue;
if (sp->specs->crew1 + sp->specs->crew2 + sp->specs->crew3 >
sp->file->pcrew * 6) {
send_signal(sp, "prize crew overthrown");
send_points(sp->file->captured,
sp->file->captured->file->points
- 2 * sp->specs->pts);
send_captured(sp, -1);
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}
}
}
static int
str_end(const char *str)
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{
const char *p;
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for (p = str; *p; p++)
;
return p == str ? 0 : p[-1];
}
void
closeon(struct ship *from, struct ship *to, char *command, size_t commandmax,
int ta, int ma, bool af)
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{
int high;
char temp[10];
temp[0] = command[0] = '\0';
high = -30000;
try(from, to, command, commandmax, temp, sizeof(temp),
ma, ta, af, ma, from->file->dir, &high, 0);
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}
static int
score(struct ship *ship, struct ship *to, char *movement, size_t movementmax,
int onlytemp)
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{
int drift;
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int row, col, dir, total, ran;
struct File *fp = ship->file;
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if ((dir = fp->dir) == 0)
return 0;
row = fp->row;
col = fp->col;
drift = fp->drift;
move_ship(ship, movement, &fp->dir, &fp->row, &fp->col, &drift);
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if (!*movement)
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strlcpy(movement, "d", movementmax);
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ran = range(ship, to);
total = -50 * ran;
if (ran < 4 && gunsbear(ship, to))
total += 60;
if ((ran = portside(ship, to, 1) - fp->dir) == 4 || ran == -4)
total = -30000;
if (!onlytemp) {
fp->row = row;
fp->col = col;
fp->dir = dir;
}
return total;
}
static void
move_ship(struct ship *ship, const char *p, unsigned char *dir,
short *row, short *col, int *drift)
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{
int dist;
char moved = 0;
for (; *p; p++) {
switch (*p) {
case 'r':
if (++*dir == 9)
*dir = 1;
break;
case 'l':
if (--*dir == 0)
*dir = 8;
break;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7':
moved++;
if (*dir % 2 == 0)
dist = dtab[*p - '0'];
else
dist = *p - '0';
*row -= dr[*dir] * dist;
*col -= dc[*dir] * dist;
break;
}
}
if (!moved) {
if (windspeed != 0 && ++*drift > 2) {
if ((ship->specs->class >= 3 && !snagged(ship))
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|| (turn & 1) == 0) {
*row -= dr[winddir];
*col -= dc[winddir];
}
}
} else
*drift = 0;
}
static void
try(struct ship *f, struct ship *t,
char *command, size_t commandmax,
char *temp, size_t tempmax,
int ma, int ta, bool af, int vma, int dir, int *high, int rakeme)
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{
int new, n;
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char st[4];
#define rakeyou (gunsbear(f, t) && !gunsbear(t, f))
if ((n = str_end(temp)) < '1' || n > '9')
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for (n = 1; vma - n >= 0; n++) {
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snprintf(st, sizeof(st), "%d", n);
strlcat(temp, st, tempmax);
new = score(f, t, temp, tempmax, rakeme);
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if (new > *high && (!rakeme || rakeyou)) {
*high = new;
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strlcpy(command, temp, commandmax);
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}
try(f, t, command, commandmax, temp, tempmax,
ma-n, ta, af, vma-n,
dir, high, rakeme);
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rmend(temp);
}
if ((ma > 0 && ta > 0 && (n = str_end(temp)) != 'l' && n != 'r') ||
!strlen(temp)) {
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strlcat(temp, "r", tempmax);
new = score(f, t, temp, tempmax, rakeme);
if (new > *high && (!rakeme ||
(gunsbear(f, t) && !gunsbear(t, f)))) {
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*high = new;
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strlcpy(command, temp, commandmax);
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}
try(f, t, command, commandmax, temp, tempmax,
ma-1, ta-1, af,
min(ma-1, maxmove(f, (dir == 8 ? 1 : dir+1), 0)),
(dir == 8 ? 1 : dir+1), high, rakeme);
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rmend(temp);
}
if ((ma > 0 && ta > 0 && (n = str_end(temp)) != 'l' && n != 'r') ||
!strlen(temp)) {
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strlcat(temp, "l", sizeof(temp));
new = score(f, t, temp, tempmax, rakeme);
if (new > *high && (!rakeme ||
(gunsbear(f, t) && !gunsbear(t, f)))) {
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*high = new;
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strlcpy(command, temp, commandmax);
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}
try(f, t, command, commandmax, temp, tempmax,
ma-1, ta-1, af,
(min(ma-1,maxmove(f, (dir-1 ? dir-1 : 8), 0))),
(dir-1 ? dir -1 : 8), high, rakeme);
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rmend(temp);
}
}
static void
rmend(char *str)
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{
char *p;
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for (p = str; *p; p++)
;
if (p != str)
*--p = 0;
}