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- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved.
- *
- * 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * 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.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)dr_2.c 5.4 (Berkeley) 6/1/90";
- #endif /* not lint */
-
- #include "driver.h"
-
- #define couldwin(f,t) (f->specs->crew2 > t->specs->crew2 * 1.5)
-
- thinkofgrapples()
- {
- register struct ship *sp, *sq;
- char friendly;
-
- 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 (toughmelee(sp, sq, 0, 0))
- ungrap(sp, sq);
- else
- grap(sp, sq);
- else if (couldwin(sp, sq)) {
- grap(sp, sq);
- sp->file->loadwith = L_GRAPE;
- }
- } else
- ungrap(sp, sq);
- }
- }
- }
-
- checkup()
- {
- register struct ship *sp, *sq;
- register char explode, sink;
-
- foreachship(sp) {
- if (sp->file->dir == 0)
- continue;
- explode = sp->file->explode;
- sink = sp->file->sink;
- if (explode != 1 && sink != 1)
- continue;
- if (die() < 5)
- continue;
- Write(sink == 1 ? W_SINK : W_EXPLODE, sp, 0, 2, 0, 0, 0);
- Write(W_DIR, sp, 0, 0, 0, 0, 0);
- if (snagged(sp))
- foreachship(sq)
- cleansnag(sp, sq, 1);
- if (sink != 1) {
- makesignal(sp, "exploding!", (struct ship *)0);
- foreachship(sq) {
- if (sp != sq && sq->file->dir && range(sp, sq) < 4)
- table(RIGGING, L_EXPLODE, sp->specs->guns/13, sq, sp, 6);
- }
- } else
- makesignal(sp, "sinking!", (struct ship *)0);
- }
- }
-
- prizecheck()
- {
- register struct ship *sp;
-
- 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) {
- Write(W_SIGNAL, sp, 1,
- (int)"prize crew overthrown", 0, 0, 0);
- Write(W_POINTS, sp->file->captured, 0, sp->file->captured->file->points - 2 * sp->specs->pts, 0, 0, 0);
- Write(W_CAPTURED, sp, 0, -1, 0, 0, 0);
- }
- }
- }
-
- strend(str)
- char *str;
- {
- register char *p;
-
- for (p = str; *p; p++)
- ;
- return p == str ? 0 : p[-1];
- }
-
- closeon(from, to, command, ta, ma, af)
- register struct ship *from, *to;
- char command[];
- int ma, ta, af;
- {
- int high;
- char temp[10];
-
- temp[0] = command[0] = '\0';
- high = -30000;
- try(command, temp, ma, ta, af, ma, from->file->dir, from, to, &high, 0);
- }
-
- int dtab[] = {0,1,1,2,3,4,4,5}; /* diagonal distances in x==y */
-
- score(movement, ship, to, onlytemp)
- char movement[];
- register struct ship *ship, *to;
- char onlytemp;
- {
- char drift;
- int row, col, dir, total, ran;
- register struct File *fp = ship->file;
-
- if ((dir = fp->dir) == 0)
- return 0;
- row = fp->row;
- col = fp->col;
- drift = fp->drift;
- move(movement, ship, &fp->dir, &fp->row, &fp->col, &drift);
- if (!*movement)
- (void) strcpy(movement, "d");
-
- 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;
- }
-
- move(p, ship, dir, row, col, drift)
- register char *p;
- register struct ship *ship;
- register char *dir;
- register short *row, *col;
- register char *drift;
- {
- 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)
- || (turn & 1) == 0) {
- *row -= dr[winddir];
- *col -= dc[winddir];
- }
- }
- } else
- *drift = 0;
- }
-
- try(command, temp, ma, ta, af, vma, dir, f, t, high, rakeme)
- register struct ship *f, *t;
- int ma, ta, af, *high, rakeme;
- char command[], temp[];
- {
- register int new, n;
- char st[4];
- #define rakeyou (gunsbear(f, t) && !gunsbear(t, f))
-
- if ((n = strend(temp)) < '1' || n > '9')
- for (n = 1; vma - n >= 0; n++) {
- (void) sprintf(st, "%d", n);
- (void) strcat(temp, st);
- new = score(temp, f, t, rakeme);
- if (new > *high && (!rakeme || rakeyou)) {
- *high = new;
- (void) strcpy(command, temp);
- }
- try(command, temp, ma-n, ta, af, vma-n,
- dir, f, t, high, rakeme);
- rmend(temp);
- }
- if (ma > 0 && ta > 0 && (n = strend(temp)) != 'l' && n != 'r' || !strlen(temp)) {
- (void) strcat(temp, "r");
- new = score(temp, f, t, rakeme);
- if (new > *high && (!rakeme || gunsbear(f, t) && !gunsbear(t, f))) {
- *high = new;
- (void) strcpy(command, temp);
- }
- try(command, temp, ma-1, ta-1, af, min(ma-1, maxmove(f, (dir == 8 ? 1 : dir+1), 0)), (dir == 8 ? 1 : dir+1),f,t,high,rakeme);
- rmend(temp);
- }
- if ((ma > 0 && ta > 0 && (n = strend(temp)) != 'l' && n != 'r') || !strlen(temp)){
- (void) strcat(temp, "l");
- new = score(temp, f, t, rakeme);
- if (new > *high && (!rakeme || (gunsbear(f, t) && !gunsbear(t, f)))){
- *high = new;
- (void) strcpy(command, temp);
- }
- try(command, temp, ma-1, ta-1, af, (min(ma-1,maxmove(f, (dir-1 ? dir-1 : 8), 0))), (dir-1 ? dir -1 : 8), f, t, high, rakeme);
- rmend(temp);
- }
- }
-
- rmend(str)
- char *str;
- {
- register char *p;
-
- for (p = str; *p; p++)
- ;
- if (p != str)
- *--p = 0;
- }
-