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bs.c
1196 lines (1054 loc) · 25.7 KB
/
bs.c
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/*-
* bs.c - original author: Bruce Holloway
* salvo option by: Chuck A DeGaul
* with improved user interface, autoconfiguration and code cleanup
* by Eric S. Raymond <esr@snark.thyrsus.com>
* v1.2 with color support and minor portability fixes, November 1990
* v2.0 featuring strict ANSI/POSIX conformance, November 1993.
*
* $FreeBSD: src/games/bs/bs.c,v 1.9 2000/02/21 03:07:31 billf Exp $
* $DragonFly: src/games/bs/bs.c,v 1.7 2007/04/18 18:32:12 swildner Exp $
*/
#include <assert.h>
#include <ctype.h>
#include <ncurses.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
/*
* Constants for tuning the random-fire algorithm. It prefers moves that
* diagonal-stripe the board with a stripe separation of srchstep. If
* no such preferred moves are found, srchstep is decremented.
*/
#define BEGINSTEP 3 /* initial value of srchstep */
/* miscellaneous constants */
#define SHIPTYPES 5
#define OTHER (1-turn)
#define PLAYER 0
#define COMPUTER 1
#define MARK_HIT 'H'
#define MARK_MISS 'o'
#define CTRLC '\003' /* used as terminate command */
#define FF '\014' /* used as redraw command */
/* coordinate handling */
#define BWIDTH 10
#define BDEPTH 10
/* display symbols */
#define SHOWHIT '*'
#define SHOWSPLASH ' '
#define IS_SHIP(c) isupper(c)
/* how to position us on player board */
#define PYBASE 3
#define PXBASE 3
#define PY(y) (PYBASE + (y))
#define PX(x) (PXBASE + (x)*3)
#define pgoto(y, x) move(PY(y), PX(x))
/* how to position us on cpu board */
#define CYBASE 3
#define CXBASE 48
#define CY(y) (CYBASE + (y))
#define CX(x) (CXBASE + (x)*3)
#define cgoto(y, x) move(CY(y), CX(x))
#define ONBOARD(x, y) (x >= 0 && x < BWIDTH && y >= 0 && y < BDEPTH)
/* other board locations */
#define COLWIDTH 80
#define PROMPTLINE 21 /* prompt line */
#define SYBASE CYBASE + BDEPTH + 3 /* move key diagram */
#define SXBASE 63
#define MYBASE SYBASE - 1 /* diagram caption */
#define MXBASE 64
#define HYBASE SYBASE - 1 /* help area */
#define HXBASE 0
/* this will need to be changed if BWIDTH changes */
static char numbers[] = " 0 1 2 3 4 5 6 7 8 9";
static char carrier[] = "Aircraft Carrier";
static char battle[] = "Battleship";
static char sub[] = "Submarine";
static char destroy[] = "Destroyer";
static char ptboat[] = "PT Boat";
static char name[40];
static char dftname[] = "stranger";
/* direction constants */
enum directions { E, SE, S, SW, W, NW, N, NE };
static int xincr[8] = {1, 1, 0, -1, -1, -1, 0, 1};
static int yincr[8] = {0, 1, 1, 1, 0, -1, -1, -1};
/* current ship position and direction */
static int curx = (BWIDTH / 2);
static int cury = (BDEPTH / 2);
typedef struct {
char *name; /* name of the ship type */
char hits; /* how many times has this ship been hit? */
char symbol; /* symbol for game purposes */
char length; /* length of ship */
char x, y; /* coordinates of ship start point */
enum directions dir; /* direction of `bow' */
bool placed; /* has it been placed on the board? */
}
ship_t;
ship_t plyship[SHIPTYPES] =
{
{ carrier, 0, 'A', 5, 0, 0, E, FALSE},
{ battle, 0, 'B', 4, 0, 0, E, FALSE},
{ destroy, 0, 'D', 3, 0, 0, E, FALSE},
{ sub, 0, 'S', 3, 0, 0, E, FALSE},
{ ptboat, 0, 'P', 2, 0, 0, E, FALSE},
};
ship_t cpuship[SHIPTYPES] =
{
{ carrier, 0, 'A', 5, 0, 0, E, FALSE},
{ battle, 0, 'B', 4, 0, 0, E, FALSE},
{ destroy, 0, 'D', 3, 0, 0, E, FALSE},
{ sub, 0, 'S', 3, 0, 0, E, FALSE},
{ ptboat, 0, 'P', 2, 0, 0, E, FALSE},
};
/* "Hits" board, and main board. */
static char hits[2][BWIDTH][BDEPTH], board[2][BWIDTH][BDEPTH];
static int turn; /* 0=player, 1=computer */
static int plywon=0, cpuwon=0; /* How many games has each won? */
static int salvo, blitz, closepack;
#define PR addstr
static void prompt(int, const char *, ...) __printflike(2, 3);
static bool checkplace (int, ship_t *, int);
static int getcoord (int);
int playagain (void);
/* end the game, either normally or due to signal */
static void
uninitgame(void)
{
clear();
refresh();
resetterm();
echo();
endwin();
exit(0);
}
static void
sighandler(__unused int sig)
{
uninitgame();
}
/* announce which game options are enabled */
static void
announceopts(void)
{
printw("Playing %s game (", (salvo || blitz || closepack) ?
"optional" : "standard");
if (salvo)
printw("salvo, ");
else
printw("nosalvo, ");
if (blitz)
printw("blitz, ");
else
printw("noblitz, ");
if (closepack)
printw("closepack)");
else
printw("noclosepack)");
}
static void
intro(void)
{
char *tmpname;
srandomdev();
tmpname = getlogin();
signal(SIGINT,sighandler);
signal(SIGINT,sighandler);
signal(SIGIOT,sighandler); /* for assert(3) */
if(signal(SIGQUIT,SIG_IGN) != SIG_IGN)
signal(SIGQUIT,sighandler);
if(tmpname != '\0') {
strcpy(name,tmpname);
name[0] = toupper(name[0]);
} else {
strcpy(name,dftname);
}
initscr();
#ifdef KEY_MIN
keypad(stdscr, TRUE);
#endif /* KEY_MIN */
saveterm();
nonl();
cbreak();
noecho();
#ifdef PENGUIN
clear();
mvaddstr(4,29,"Welcome to Battleship!");
move(8,0);
PR(" \\\n");
PR(" \\ \\ \\\n");
PR(" \\ \\ \\ \\ \\_____________\n");
PR(" \\ \\ \\_____________ \\ \\/ |\n");
PR(" \\ \\/ \\ \\/ |\n");
PR(" \\/ \\_____/ |__\n");
PR(" ________________/ |\n");
PR(" \\ S.S. Penguin |\n");
PR(" \\ /\n");
PR(" \\___________________________________________________/\n");
mvaddstr(22,27,"Hit any key to continue..."); refresh();
getch();
#endif /* PENGUIN */
#ifdef A_COLOR
start_color();
init_pair(COLOR_BLACK, COLOR_BLACK, COLOR_BLACK);
init_pair(COLOR_GREEN, COLOR_GREEN, COLOR_BLACK);
init_pair(COLOR_RED, COLOR_RED, COLOR_BLACK);
init_pair(COLOR_CYAN, COLOR_CYAN, COLOR_BLACK);
init_pair(COLOR_WHITE, COLOR_WHITE, COLOR_BLACK);
init_pair(COLOR_MAGENTA, COLOR_MAGENTA, COLOR_BLACK);
init_pair(COLOR_BLUE, COLOR_BLUE, COLOR_BLACK);
init_pair(COLOR_YELLOW, COLOR_YELLOW, COLOR_BLACK);
#endif /* A_COLOR */
}
/* print a message at the prompt line */
static void
prompt(int n, const char *f, ...)
{
char buf[COLWIDTH + 1];
va_list ap;
va_start(ap, f);
move(PROMPTLINE + n, 0);
clrtoeol();
vsnprintf(buf, COLWIDTH + 1, f, ap);
printw("%s", buf);
refresh();
va_end(ap);
}
static void
error(const char *s)
{
move(PROMPTLINE + 2, 0);
clrtoeol();
if (s) {
addstr(s);
beep();
}
}
static void
placeship(int b, ship_t *ss, int vis)
{
int l;
for(l = 0; l < ss->length; ++l) {
int newx = ss->x + l * xincr[ss->dir];
int newy = ss->y + l * yincr[ss->dir];
board[b][newx][newy] = ss->symbol;
if (vis) {
pgoto(newy, newx);
addch((chtype)ss->symbol);
}
}
ss->hits = 0;
}
static int
rnd(int n)
{
return(random() % n);
}
/* generate a valid random ship placement into px,py */
static void
randomplace(int b, ship_t *ss)
{
do {
ss->y = rnd(BDEPTH);
ss->x = rnd(BWIDTH);
ss->dir = rnd(2) ? E : S;
} while (!checkplace(b, ss, FALSE));
}
static void
initgame(void)
{
int i, j, unplaced;
ship_t *ss;
clear();
mvaddstr(0,35,"BATTLESHIPS");
move(PROMPTLINE + 2, 0);
announceopts();
bzero(board, sizeof(char) * BWIDTH * BDEPTH * 2);
bzero(hits, sizeof(char) * BWIDTH * BDEPTH * 2);
for (i = 0; i < SHIPTYPES; i++) {
ss = cpuship + i;
ss->x = ss->y = ss->dir = ss->hits = ss->placed = 0;
ss = plyship + i;
ss->x = ss->y = ss->dir = ss->hits = ss->placed = 0;
}
/* draw empty boards */
mvaddstr(PYBASE - 2, PXBASE + 5, "Main Board");
mvaddstr(PYBASE - 1, PXBASE - 3,numbers);
for(i=0; i < BDEPTH; ++i)
{
mvaddch(PYBASE + i, PXBASE - 3, i + 'A');
#ifdef A_COLOR
if (has_colors())
attron(COLOR_PAIR(COLOR_BLUE));
#endif /* A_COLOR */
addch(' ');
for (j = 0; j < BWIDTH; j++)
addstr(" . ");
#ifdef A_COLOR
attrset(0);
#endif /* A_COLOR */
addch(' ');
addch(i + 'A');
}
mvaddstr(PYBASE + BDEPTH, PXBASE - 3,numbers);
mvaddstr(CYBASE - 2, CXBASE + 7,"Hit/Miss Board");
mvaddstr(CYBASE - 1, CXBASE - 3, numbers);
for(i=0; i < BDEPTH; ++i)
{
mvaddch(CYBASE + i, CXBASE - 3, i + 'A');
#ifdef A_COLOR
if (has_colors())
attron(COLOR_PAIR(COLOR_BLUE));
#endif /* A_COLOR */
addch(' ');
for (j = 0; j < BWIDTH; j++)
addstr(" . ");
#ifdef A_COLOR
attrset(0);
#endif /* A_COLOR */
addch(' ');
addch(i + 'A');
}
mvaddstr(CYBASE + BDEPTH,CXBASE - 3,numbers);
mvprintw(HYBASE, HXBASE,
"To position your ships: move the cursor to a spot, then");
mvprintw(HYBASE+1,HXBASE,
"type the first letter of a ship type to select it, then");
mvprintw(HYBASE+2,HXBASE,
"type a direction ([hjkl] or [4862]), indicating how the");
mvprintw(HYBASE+3,HXBASE,
"ship should be pointed. You may also type a ship letter");
mvprintw(HYBASE+4,HXBASE,
"followed by `r' to position it randomly, or type `R' to");
mvprintw(HYBASE+5,HXBASE,
"place all remaining ships randomly.");
mvaddstr(MYBASE, MXBASE, "Aiming keys:");
mvaddstr(SYBASE, SXBASE, "y k u 7 8 9");
mvaddstr(SYBASE+1, SXBASE, " \\|/ \\|/ ");
mvaddstr(SYBASE+2, SXBASE, "h-+-l 4-+-6");
mvaddstr(SYBASE+3, SXBASE, " /|\\ /|\\ ");
mvaddstr(SYBASE+4, SXBASE, "b j n 1 2 3");
/* have the computer place ships */
for(ss = cpuship; ss < cpuship + SHIPTYPES; ss++)
{
randomplace(COMPUTER, ss);
placeship(COMPUTER, ss, FALSE);
}
ss = NULL;
do {
char c, docked[SHIPTYPES + 2], *cp = docked;
/* figure which ships still wait to be placed */
*cp++ = 'R';
for (i = 0; i < SHIPTYPES; i++)
if (!plyship[i].placed)
*cp++ = plyship[i].symbol;
*cp = '\0';
/* get a command letter */
prompt(1, "Type one of [%s] to pick a ship.", docked+1);
do {
c = getcoord(PLAYER);
} while
(!strchr(docked, c));
if (c == 'R')
ungetch('R');
else
{
/* map that into the corresponding symbol */
for (ss = plyship; ss < plyship + SHIPTYPES; ss++)
if (ss->symbol == c)
break;
prompt(1, "Type one of [hjklrR] to place your %s.", ss->name);
pgoto(cury, curx);
}
do {
c = getch();
} while
(!strchr("hjklrR", c) || c == FF);
if (c == FF)
{
clearok(stdscr, TRUE);
refresh();
}
else if (c == 'r')
{
prompt(1, "Random-placing your %s", ss->name);
randomplace(PLAYER, ss);
placeship(PLAYER, ss, TRUE);
error(NULL);
ss->placed = TRUE;
}
else if (c == 'R')
{
prompt(1, "Placing the rest of your fleet at random...");
for (ss = plyship; ss < plyship + SHIPTYPES; ss++)
if (!ss->placed)
{
randomplace(PLAYER, ss);
placeship(PLAYER, ss, TRUE);
ss->placed = TRUE;
}
error(NULL);
}
else if (strchr("hjkl8462", c))
{
ss->x = curx;
ss->y = cury;
switch(c)
{
case 'k': case '8': ss->dir = N; break;
case 'j': case '2': ss->dir = S; break;
case 'h': case '4': ss->dir = W; break;
case 'l': case '6': ss->dir = E; break;
}
if (checkplace(PLAYER, ss, TRUE))
{
placeship(PLAYER, ss, TRUE);
error(NULL);
ss->placed = TRUE;
}
}
for (unplaced = i = 0; i < SHIPTYPES; i++)
unplaced += !plyship[i].placed;
} while
(unplaced);
turn = rnd(2);
mvprintw(HYBASE, HXBASE,
"To fire, move the cursor to your chosen aiming point ");
mvprintw(HYBASE+1, HXBASE,
"and strike any key other than a motion key. ");
mvprintw(HYBASE+2, HXBASE,
" ");
mvprintw(HYBASE+3, HXBASE,
" ");
mvprintw(HYBASE+4, HXBASE,
" ");
mvprintw(HYBASE+5, HXBASE,
" ");
prompt(0, "Press any key to start...");
getch();
}
static int
getcoord(int atcpu)
{
int ny, nx, c;
if (atcpu)
cgoto(cury,curx);
else
pgoto(cury, curx);
refresh();
for (;;)
{
if (atcpu)
{
mvprintw(CYBASE + BDEPTH+1, CXBASE+11, "(%d, %c)", curx, 'A'+cury);
cgoto(cury, curx);
}
else
{
mvprintw(PYBASE + BDEPTH+1, PXBASE+11, "(%d, %c)", curx, 'A'+cury);
pgoto(cury, curx);
}
switch(c = getch())
{
case 'k': case '8':
#ifdef KEY_MIN
case KEY_UP:
#endif /* KEY_MIN */
ny = cury+BDEPTH-1; nx = curx;
break;
case 'j': case '2':
#ifdef KEY_MIN
case KEY_DOWN:
#endif /* KEY_MIN */
ny = cury+1; nx = curx;
break;
case 'h': case '4':
#ifdef KEY_MIN
case KEY_LEFT:
#endif /* KEY_MIN */
ny = cury; nx = curx+BWIDTH-1;
break;
case 'l': case '6':
#ifdef KEY_MIN
case KEY_RIGHT:
#endif /* KEY_MIN */
ny = cury; nx = curx+1;
break;
case 'y': case '7':
#ifdef KEY_MIN
case KEY_A1:
#endif /* KEY_MIN */
ny = cury+BDEPTH-1; nx = curx+BWIDTH-1;
break;
case 'b': case '1':
#ifdef KEY_MIN
case KEY_C1:
#endif /* KEY_MIN */
ny = cury+1; nx = curx+BWIDTH-1;
break;
case 'u': case '9':
#ifdef KEY_MIN
case KEY_A3:
#endif /* KEY_MIN */
ny = cury+BDEPTH-1; nx = curx+1;
break;
case 'n': case '3':
#ifdef KEY_MIN
case KEY_C3:
#endif /* KEY_MIN */
ny = cury+1; nx = curx+1;
break;
case FF:
nx = curx; ny = cury;
clearok(stdscr, TRUE);
refresh();
break;
default:
if (atcpu)
mvaddstr(CYBASE + BDEPTH + 1, CXBASE + 11, " ");
else
mvaddstr(PYBASE + BDEPTH + 1, PXBASE + 11, " ");
return(c);
}
curx = nx % BWIDTH;
cury = ny % BDEPTH;
}
}
/* is this location on the selected zboard adjacent to a ship? */
static int
collidecheck(int b, int y, int x)
{
int collide;
/* anything on the square */
if ((collide = IS_SHIP(board[b][x][y])) != 0)
return(collide);
/* anything on the neighbors */
if (!closepack) {
int i;
for (i = 0; i < 8; i++) {
int xend, yend;
yend = y + yincr[i];
xend = x + xincr[i];
if (ONBOARD(xend, yend))
collide += IS_SHIP(board[b][xend][yend]);
}
}
return(collide);
}
static bool
checkplace(int b, ship_t *ss, int vis)
{
int l, xend, yend;
/* first, check for board edges */
xend = ss->x + (ss->length - 1) * xincr[ss->dir];
yend = ss->y + (ss->length - 1) * yincr[ss->dir];
if (!ONBOARD(xend, yend)) {
if (vis) {
switch(rnd(3)) {
case 0:
error("Ship is hanging from the edge of the world");
break;
case 1:
error("Try fitting it on the board");
break;
case 2:
error("Figure I won't find it if you put it there?");
break;
}
}
return(0);
}
for(l = 0; l < ss->length; ++l) {
if(collidecheck(b, ss->y+l*yincr[ss->dir], ss->x+l*xincr[ss->dir])) {
if (vis) {
switch(rnd(3)) {
case 0:
error("There's already a ship there");
break;
case 1:
error("Collision alert! Aaaaaagh!");
break;
case 2:
error("Er, Admiral, what about the other ship?");
break;
}
}
return(FALSE);
}
}
return(TRUE);
}
static int
awinna(void)
{
int i, j;
ship_t *ss;
for(i=0; i<2; ++i)
{
ss = (i) ? cpuship : plyship;
for(j=0; j < SHIPTYPES; ++j, ++ss)
if(ss->length > ss->hits)
break;
if (j == SHIPTYPES)
return(OTHER);
}
return(-1);
}
/* a hit on the targeted ship */
static ship_t *
hitship(int x, int y)
{
ship_t *sb, *ss;
char sym;
int oldx, oldy;
getyx(stdscr, oldy, oldx);
sb = (turn) ? plyship : cpuship;
if(!(sym = board[OTHER][x][y]))
return(NULL);
for(ss = sb; ss < sb + SHIPTYPES; ++ss)
if(ss->symbol == sym)
{
if (++ss->hits < ss->length) { /* still afloat? */
return(NULL);
} else { /* sunk */
int i, j;
if (!closepack) {
for (j = -1; j <= 1; j++) {
int bx = ss->x + j * xincr[(ss->dir + 2) % 8];
int by = ss->y + j * yincr[(ss->dir + 2) % 8];
for (i = -1; i <= ss->length; ++i) {
int cx, cy;
cx = bx + i * xincr[ss->dir];
cy = by + i * yincr[ss->dir];
if (ONBOARD(cx, cy)) {
hits[turn][cx][cy] = MARK_MISS;
if (turn % 2 == PLAYER) {
cgoto(cy, cx);
#ifdef A_COLOR
if (has_colors())
attron(COLOR_PAIR(COLOR_GREEN));
#endif /* A_COLOR */
addch(MARK_MISS);
#ifdef A_COLOR
attrset(0);
#endif /* A_COLOR */
}
}
}
}
}
for (i = 0; i < ss->length; ++i)
{
int dx = ss->x + i * xincr[ss->dir];
int dy = ss->y + i * yincr[ss->dir];
hits[turn][dx][dy] = ss->symbol;
if (turn % 2 == PLAYER)
{
cgoto(dy, dx);
addch(ss->symbol);
}
}
move(oldy, oldx);
return(ss);
}
}
move(oldy, oldx);
return(NULL);
}
static int
plyturn(void)
{
ship_t *ss;
bool hit;
char const *m;
m = NULL;
prompt(1, "Where do you want to shoot? ");
for (;;)
{
getcoord(COMPUTER);
if (hits[PLAYER][curx][cury])
{
prompt(1, "You shelled this spot already! Try again.");
beep();
}
else
break;
}
hit = IS_SHIP(board[COMPUTER][curx][cury]);
hits[PLAYER][curx][cury] = hit ? MARK_HIT : MARK_MISS;
cgoto(cury, curx);
#ifdef A_COLOR
if (has_colors()) {
if (hit)
attron(COLOR_PAIR(COLOR_RED));
else
attron(COLOR_PAIR(COLOR_GREEN));
}
#endif /* A_COLOR */
addch((chtype)hits[PLAYER][curx][cury]);
#ifdef A_COLOR
attrset(0);
#endif /* A_COLOR */
prompt(1, "You %s.", hit ? "scored a hit" : "missed");
if(hit && (ss = hitship(curx, cury)))
{
switch(rnd(5))
{
case 0:
m = " You sank my %s!";
break;
case 1:
m = " I have this sinking feeling about my %s....";
break;
case 2:
m = " My %s has gone to Davy Jones's locker!";
break;
case 3:
m = " Glub, glub -- my %s is headed for the bottom!";
break;
case 4:
m = " You'll pick up survivors from my %s, I hope...!";
break;
}
printw(m, ss->name);
beep();
return(awinna() == -1);
}
return(hit);
}
static int
sgetc(const char *s)
{
const char *s1;
int ch;
refresh();
for(;;) {
ch = getch();
if (islower(ch))
ch = toupper(ch);
if (ch == CTRLC)
uninitgame();
for (s1=s; *s1 && ch != *s1; ++s1)
continue;
if (*s1) {
addch((chtype)ch);
refresh();
return(ch);
}
}
}
/* random-fire routine -- implements simple diagonal-striping strategy */
static void
randomfire(int *px, int *py)
{
static int turncount = 0;
static int srchstep = BEGINSTEP;
static int huntoffs; /* Offset on search strategy */
int ypossible[BWIDTH * BDEPTH], xpossible[BWIDTH * BDEPTH], nposs;
int ypreferred[BWIDTH * BDEPTH], xpreferred[BWIDTH * BDEPTH], npref;
int x, y, i;
if (turncount++ == 0)
huntoffs = rnd(srchstep);
/* first, list all possible moves */
nposs = npref = 0;
for (x = 0; x < BWIDTH; x++)
for (y = 0; y < BDEPTH; y++)
if (!hits[COMPUTER][x][y])
{
xpossible[nposs] = x;
ypossible[nposs] = y;
nposs++;
if (((x+huntoffs) % srchstep) != (y % srchstep))
{
xpreferred[npref] = x;
ypreferred[npref] = y;
npref++;
}
}
if (npref)
{
i = rnd(npref);
*px = xpreferred[i];
*py = ypreferred[i];
}
else if (nposs)
{
i = rnd(nposs);
*px = xpossible[i];
*py = ypossible[i];
if (srchstep > 1)
--srchstep;
}
else
{
error("No moves possible?? Help!");
exit(1);
/*NOTREACHED*/
}
}
#define S_MISS 0
#define S_HIT 1
#define S_SUNK -1
/* fire away at given location */
static bool
cpufire(int x, int y)
{
bool hit, sunk;
ship_t *ss;
ss = NULL;
hits[COMPUTER][x][y] = (hit = (board[PLAYER][x][y])) ? MARK_HIT : MARK_MISS;
mvprintw(PROMPTLINE, 0,
"I shoot at %c%d. I %s!", y + 'A', x, hit ? "hit" : "miss");
ss = hitship(x, y);
sunk = hit && ss;
if (sunk)
printw(" I've sunk your %s", ss->name);
clrtoeol();
pgoto(y, x);
#ifdef A_COLOR
if (has_colors()) {
if (hit)
attron(COLOR_PAIR(COLOR_RED));
else
attron(COLOR_PAIR(COLOR_GREEN));
}
#endif /* A_COLOR */
addch((chtype)(hit ? SHOWHIT : SHOWSPLASH));
#ifdef A_COLOR
attrset(0);
#endif /* A_COLOR */
return(hit ? (sunk ? S_SUNK : S_HIT) : S_MISS);
}
/*
* This code implements a fairly irregular FSM, so please forgive the rampant
* unstructuredness below. The five labels are states which need to be held
* between computer turns.
*/
static bool
cputurn(void)
{
#define POSSIBLE(x, y) (ONBOARD(x, y) && !hits[COMPUTER][x][y])
#define RANDOM_FIRE 0
#define RANDOM_HIT 1
#define HUNT_DIRECT 2
#define FIRST_PASS 3
#define REVERSE_JUMP 4
#define SECOND_PASS 5
static int next = RANDOM_FIRE;
static bool used[4];
static ship_t ts;
int navail, x, y, d, n, hit = S_MISS;
switch(next)
{
case RANDOM_FIRE: /* last shot was random and missed */
refire:
randomfire(&x, &y);
if (!(hit = cpufire(x, y)))
next = RANDOM_FIRE;
else
{
ts.x = x; ts.y = y;
ts.hits = 1;
next = (hit == S_SUNK) ? RANDOM_FIRE : RANDOM_HIT;
}
break;
case RANDOM_HIT: /* last shot was random and hit */
used[E/2] = used[S/2] = used[W/2] = used[N/2] = FALSE;
/* FALLTHROUGH */
case HUNT_DIRECT: /* last shot hit, we're looking for ship's long axis */
for (d = navail = 0; d < 4; d++)
{
x = ts.x + xincr[d*2]; y = ts.y + yincr[d*2];
if (!used[d] && POSSIBLE(x, y))
navail++;
else
used[d] = TRUE;
}
if (navail == 0) /* no valid places for shots adjacent... */
goto refire; /* ...so we must random-fire */
else
{
for (d = 0, n = rnd(navail) + 1; n; n--)
while (used[d])
d++;
assert(d <= 4);
used[d] = FALSE;
x = ts.x + xincr[d*2];
y = ts.y + yincr[d*2];
assert(POSSIBLE(x, y));
if (!(hit = cpufire(x, y)))