initial commit

1 files changed, 1196 insertions, 0 deletions

diff --git a/bs/bs.c b/bs/bs.c
new file mode 100644
index 0000000..712851a
--- /dev/null
+++ b/bs/bs.c
@@ -0,0 +1,1196 @@
+/*-
+ * 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(__attribute__((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)))
+		next = HUNT_DIRECT;
+	    else
+	    {
+		ts.x = x; ts.y = y; ts.dir = d*2; ts.hits++;
+		next = (hit == S_SUNK) ? RANDOM_FIRE : FIRST_PASS;
+	    }
+	}
+	break;
+
+    case FIRST_PASS:	/* we have a start and a direction now */
+	x = ts.x + xincr[ts.dir];
+	y = ts.y + yincr[ts.dir];
+	if (POSSIBLE(x, y) && (hit = cpufire(x, y)))
+	{
+	    ts.x = x; ts.y = y; ts.hits++;
+	    next = (hit == S_SUNK) ? RANDOM_FIRE : FIRST_PASS;
+	}
+	else
+	    next = REVERSE_JUMP;
+	break;
+
+    case REVERSE_JUMP:	/* nail down the ship's other end */
+	d = ts.dir + 4;
+	x = ts.x + ts.hits * xincr[d];
+	y = ts.y + ts.hits * yincr[d];
+	if (POSSIBLE(x, y) && (hit = cpufire(x, y)))
+	{
+	    ts.x = x; ts.y = y; ts.dir = d; ts.hits++;
+	    next = (hit == S_SUNK) ? RANDOM_FIRE : SECOND_PASS;
+	}
+	else
+	    next = RANDOM_FIRE;
+	break;
+
+    case SECOND_PASS:	/* kill squares not caught on first pass */
+	x = ts.x + xincr[ts.dir];
+	y = ts.y + yincr[ts.dir];
+	if (POSSIBLE(x, y) && (hit = cpufire(x, y)))
+	{
+	    ts.x = x; ts.y = y; ts.hits++;
+	    next = (hit == S_SUNK) ? RANDOM_FIRE: SECOND_PASS;
+	    break;
+	}
+	else
+	    next = RANDOM_FIRE;
+	break;
+    }
+
+    /* check for continuation and/or winner */
+    if (salvo)
+    {
+	refresh();
+	sleep(1);
+    }
+    if (awinna() != -1)
+	return(FALSE);
+
+#ifdef DEBUG
+    mvprintw(PROMPTLINE + 2, 0,
+		    "New state %d, x=%d, y=%d, d=%d",
+		    next, x, y, d);
+#endif /* DEBUG */
+    return(hit);
+}
+
+int
+playagain(void)
+{
+    int j;
+    ship_t *ss;
+
+    for (ss = cpuship; ss < cpuship + SHIPTYPES; ss++) {
+		for(j = 0; j < ss->length; j++) {
+	    	cgoto(ss->y + j * yincr[ss->dir], ss->x + j * xincr[ss->dir]);
+	    	addch((chtype)ss->symbol);
+		}
+	}
+
+    if(awinna()) {
+		++cpuwon;
+    } else {
+		++plywon;
+	}
+
+    j = 18 + strlen(name);
+    if(plywon >= 10) {
+		++j;
+    } else if(cpuwon >= 10) {
+		++j;
+	}
+
+	mvprintw(1,(COLWIDTH-j)/2,
+		    "%s: %d     Computer: %d",name,plywon,cpuwon);
+
+    prompt(2, (awinna()) ? "Want to be humiliated again, %s [yn]? "
+	   : "Going to give me a chance for revenge, %s [yn]? ",name);
+    return(sgetc("YN") == 'Y');
+}
+
+static void
+usage(void)
+{
+		fprintf(stderr, "Usage: battle [-s | -b] [-c]\n");
+		fprintf(stderr, "\tWhere the options are:\n");
+		fprintf(stderr, "\t-s : salvo     - One shot per ship in play\n");
+		fprintf(stderr, "\t-b : blitz     - Fire until you miss\n");
+		fprintf(stderr, "\t-c : closepack - Ships may be adjacent\n");
+		fprintf(stderr, "Blitz and Salvo are mutually exclusive\n");
+		exit(1);
+}
+
+static int
+scount(int who)
+{
+    int i, shots;
+    ship_t *sp;
+
+    if (who)
+	sp = cpuship;	/* count cpu shots */
+    else
+	sp = plyship;	/* count player shots */
+
+    for (i=0, shots = 0; i < SHIPTYPES; i++, sp++)
+    {
+	if (sp->hits >= sp->length)
+	    continue;		/* dead ship */
+	else
+	    shots++;
+    }
+    return(shots);
+}
+
+int
+main(int argc, char **argv)
+{
+	int ch;
+
+	/* revoke */
+	setgid(getgid());
+
+	while ((ch = getopt(argc, argv, "bsc")) != -1) {
+		switch (ch) {
+			case 'b':
+				blitz = 1;
+				break;
+			case 's':
+				salvo = 1;
+				break;
+			case 'c':
+				closepack = 1;
+				break;
+			case '?':
+			default:
+				usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (blitz && salvo)
+		usage();
+
+    intro();
+
+	do {
+		initgame();
+		while(awinna() == -1) {
+			if (blitz) {
+				while(turn ? cputurn() : plyturn())
+					continue;
+			} else if (salvo) {
+				int i;
+
+		   		i = scount(turn);
+		   		while (i--) {
+					if (turn) {
+		   				if (cputurn() && awinna() != -1)
+						i = 0;
+					} else {
+		   				if (plyturn() && awinna() != -1)
+						i = 0;
+					}
+		   		}
+			} else {	/* Normal game */
+				if(turn)
+					cputurn();
+		   		else
+					plyturn();
+			}
+	   		turn = OTHER;
+		}
+	} while (playagain());
+
+    uninitgame();
+    exit(0);
+}