battleships, from FreeBSD

3 files changed, 1305 insertions, 0 deletions

diff --git a/games/bs/Makefile b/games/bs/Makefile
new file mode 100644
index 00000000000..03fbf9bf015
--- /dev/null
+++ b/games/bs/Makefile
@@ -0,0 +1,9 @@
+#	$OpenBSD: Makefile,v 1.1 1996/08/21 08:18:33 downsj Exp $
+#       $FreeBSD: Makefile,v 1.1.1.1 1994/12/03 04:33:28 ache Exp $
+
+PROG=	bs
+MAN=	bs.6
+DPADD=	${LIBCURSES} ${LIBTERMLIB}
+LDADD=	-lcurses -ltermlib
+
+.include <bsd.prog.mk>
diff --git a/games/bs/bs.6 b/games/bs/bs.6
new file mode 100644
index 00000000000..cf4d3c753fa
--- /dev/null
+++ b/games/bs/bs.6
@@ -0,0 +1,43 @@
+.\"	$OpenBSD: bs.6,v 1.1 1996/08/21 08:18:34 downsj Exp $
+.TH BATTLESHIPS 6 "Aug 23, 1989"
+.SH NAME
+bs \- battleships game
+.SH SYNOPSIS
+bs [ -b | -s ] [ -c ]
+.SH DESCRIPTION
+This program allows you to play the familiar Battleships game against the
+computer on a 10x10 board. The interface is visual and largely
+self-explanatory; you place your ships and pick your shots by moving the
+cursor around the `sea' with the rogue/hack motion keys hjklyubn.
+.PP
+Note that when selecting a ship to place, you must type the capital letter
+(these are, after all, capital ships). During ship placement, the `r' command
+may be used to ignore the current position and randomly place your currently
+selected ship. The `R' command will place all remaining ships randomly. The ^L
+command (form feed, ASCII 12) will force a screen redraw).
+.PP
+The command-line arguments control game modes. 
+
+.nf
+	-b selects a `blitz' variant
+	-s selects a `salvo' variant
+	-c permits ships to be placed adjacently
+.fi
+
+The `blitz' variant allows a side to shoot for as long as it continues to
+score hits.
+.PP
+The `salvo' game allows a player one shot per turn for each of his/her ships
+still afloat.  This puts a premium scoring hits early and knocking out some
+ships and also makes much harder the situation where you face a superior force
+with only your PT-boat.
+.PP
+Normally, ships must be separated by at least one square of open water. The
+-c option disables this check and allows them to close-pack.
+.PP
+The algorithm the computer uses once it has found a ship to sink is provably
+optimal. The dispersion criterion for the random-fire algorithm may not be.
+.SH AUTHORS
+Originally written by one Bruce Holloway in 1986. Salvo mode added by Chuck A.
+DeGaul (cbosgd!cad). Visual user interface, `closepack' option, code rewrite
+and manual page by Eric S. Raymond <esr@snark.thyrsus.com> August 1989.
diff --git a/games/bs/bs.c b/games/bs/bs.c
new file mode 100644
index 00000000000..ad01d608eea
--- /dev/null
+++ b/games/bs/bs.c
@@ -0,0 +1,1253 @@
+/*	$OpenBSD: bs.c,v 1.1 1996/08/21 08:18:36 downsj Exp $	*/
+/*
+ * 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.
+ */
+
+#include <curses.h>
+#include <signal.h>
+#include <ctype.h>
+#include <assert.h>
+
+#ifndef A_UNDERLINE	/* BSD curses */
+#define	beep()	write(1,"\007",1);
+#define	cbreak	crmode
+#define	saveterm savetty
+#define	resetterm resetty
+#define	nocbreak nocrmode
+#define strchr	index
+#endif /* !A_UNDERLINE */
+
+#ifdef isxdigit		/* aha, must be an AT&T system... */
+#define srand(n)	srand48(n)
+#define rand()		lrand48()
+extern long lrand48();
+extern void srand48();
+#define bzero(s, n)	(void)memset((char *)(s), '\0', n)
+extern char *memset();
+/*
+ * Try this if ungetch() fails to resolve.
+ *
+ * #define ungetch ungetc
+ */
+#endif /* isxdigit */
+
+extern unsigned sleep();
+extern char *strchr(), *strcpy();
+extern long time();
+extern void exit();
+
+static bool checkplace();
+
+/*
+ * 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)	(void)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)	(void)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 */
+#define E	0
+#define SE	1
+#define S	2
+#define SW	3
+#define W	4
+#define NW	5
+#define N	6
+#define NE	7
+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 */
+    unsigned 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 */
+    char dir;		/* direction of `bow' */
+    bool placed;	/* has it been placed on the board? */
+}
+ship_t;
+
+ship_t plyship[SHIPTYPES] =
+{
+    { carrier,	0, 'A', 5},
+    { battle,	0, 'B', 4},
+    { destroy,	0, 'D', 3},
+    { sub,	0, 'S', 3},
+    { ptboat,	0, 'P', 2},
+};
+
+ship_t cpuship[SHIPTYPES] =
+{
+    { carrier,	0, 'A', 5},
+    { battle,	0, 'B', 4},
+    { destroy,	0, 'D', 3},
+    { sub,	0, 'S', 3},
+    { ptboat,	0, 'P', 2},
+};
+
+/* "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	(void)addstr
+
+static void uninitgame(sig)
+/* end the game, either normally or due to signal */
+int	sig;
+{
+    clear();
+    (void)refresh();
+    (void)resetterm();
+    (void)echo();
+    (void)endwin();
+    exit(0);
+}
+
+static void announceopts()
+/* announce which game options are enabled */
+{
+    if (salvo || blitz || closepack)
+    {
+	(void) printw("Playing optional game (");
+	if (salvo)
+	    (void) printw("salvo, ");
+	else
+	    (void) printw("nosalvo, ");
+	if (blitz)
+	    (void) printw("blitz ");
+	else
+	    (void) printw("noblitz, ");
+	if (closepack)
+	    (void) printw("closepack)");
+	else
+	    (void) printw("noclosepack)");
+    }
+    else
+	(void) printw(
+	"Playing standard game (noblitz, nosalvo, noclosepack)");
+}
+
+static void intro()
+{
+    extern char *getlogin();
+    char *tmpname;
+
+    srand(time(0L)+getpid());	/* Kick the random number generator */
+
+    (void) signal(SIGINT,uninitgame);
+    (void) signal(SIGINT,uninitgame);
+    (void) signal(SIGIOT,uninitgame);		/* for assert(3) */
+    if(signal(SIGQUIT,SIG_IGN) != SIG_IGN)
+	(void)signal(SIGQUIT,uninitgame);
+
+    if(tmpname = getlogin())
+    {
+	(void)strcpy(name,tmpname);
+	name[0] = toupper(name[0]);
+    }
+    else
+	(void)strcpy(name,dftname);
+
+    (void)initscr();
+#ifdef KEY_MIN
+    keypad(stdscr, TRUE);
+#endif /* KEY_MIN */
+    (void)saveterm();
+    (void)nonl();
+    (void)cbreak();
+    (void)noecho();
+
+#ifdef PENGUIN
+    (void)clear();
+    (void)mvaddstr(4,29,"Welcome to Battleship!");
+    (void)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");
+
+    (void) mvaddstr(22,27,"Hit any key to continue..."); (void)refresh();
+    (void) 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 */
+
+}
+
+/* VARARGS1 */
+static void prompt(n, f, s)
+/* print a message at the prompt line */
+int n;
+char *f, *s;
+{
+    (void) move(PROMPTLINE + n, 0);
+    (void) clrtoeol();
+    (void) printw(f, s);
+    (void) refresh();
+}
+
+static void error(s)
+char *s;
+{
+    (void) move(PROMPTLINE + 2, 0);
+    (void) clrtoeol();
+    if (s)
+    {
+	(void) addstr(s);
+	(void) beep();
+    }
+}
+
+static void placeship(b, ss, vis)
+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);
+	    (void) addch((chtype)ss->symbol);
+	}
+    }
+    ss->hits = 0;
+}
+
+static int rnd(n)
+int n;
+{
+    return(((rand() & 0x7FFF) % n));
+}
+
+static void randomplace(b, ss)
+/* generate a valid random ship placement into px,py */
+int b;
+ship_t *ss;
+{
+    register int bwidth = BWIDTH - ss->length;
+    register int bdepth = BDEPTH - ss->length;
+
+    do {
+	ss->y = rnd(bdepth);
+	ss->x = rnd(bwidth);
+	ss->dir = rnd(2) ? E : S;
+    } while
+	(!checkplace(b, ss, FALSE));
+}
+
+static void initgame()
+{
+    int i, j, unplaced;
+    ship_t *ss;
+
+    (void) clear();
+    (void) mvaddstr(0,35,"BATTLESHIPS");
+    (void) 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 */
+    (void) mvaddstr(PYBASE - 2, PXBASE + 5, "Main Board");
+    (void) mvaddstr(PYBASE - 1, PXBASE - 3,numbers);
+    for(i=0; i < BDEPTH; ++i)
+    {
+	(void) mvaddch(PYBASE + i, PXBASE - 3, i + 'A');
+#ifdef A_COLOR
+	if (has_colors())
+	    attron(COLOR_PAIR(COLOR_BLUE));
+#endif /* A_COLOR */
+	(void) addch(' ');
+	for (j = 0; j < BWIDTH; j++)
+	    (void) addstr(" . ");
+#ifdef A_COLOR
+	attrset(0);
+#endif /* A_COLOR */
+	(void) addch(' ');
+	(void) addch(i + 'A');
+    }
+    (void) mvaddstr(PYBASE + BDEPTH, PXBASE - 3,numbers);
+    (void) mvaddstr(CYBASE - 2, CXBASE + 7,"Hit/Miss Board");
+    (void) mvaddstr(CYBASE - 1, CXBASE - 3, numbers);
+    for(i=0; i < BDEPTH; ++i)
+    {
+	(void) mvaddch(CYBASE + i, CXBASE - 3, i + 'A');
+#ifdef A_COLOR
+	if (has_colors())
+	    attron(COLOR_PAIR(COLOR_BLUE));
+#endif /* A_COLOR */
+	(void) addch(' ');
+	for (j = 0; j < BWIDTH; j++)
+	    (void) addstr(" . ");
+#ifdef A_COLOR
+	attrset(0);
+#endif /* A_COLOR */
+	(void) addch(' ');
+	(void) addch(i + 'A');
+    }
+
+    (void) mvaddstr(CYBASE + BDEPTH,CXBASE - 3,numbers);
+
+    (void) mvprintw(HYBASE,  HXBASE,
+		    "To position your ships: move the cursor to a spot, then");
+    (void) mvprintw(HYBASE+1,HXBASE,
+		    "type the first letter of a ship type to select it, then");
+    (void) mvprintw(HYBASE+2,HXBASE,
+		    "type a direction ([hjkl] or [4862]), indicating how the");
+    (void) mvprintw(HYBASE+3,HXBASE,
+		    "ship should be pointed. You may also type a ship letter");
+    (void) mvprintw(HYBASE+4,HXBASE,
+		    "followed by `r' to position it randomly, or type `R' to");
+    (void) mvprintw(HYBASE+5,HXBASE,
+		    "place all remaining ships randomly.");
+
+    (void) mvaddstr(MYBASE,   MXBASE, "Aiming keys:");
+    (void) mvaddstr(SYBASE,   SXBASE, "y k u    7 8 9");
+    (void) mvaddstr(SYBASE+1, SXBASE, " \\|/      \\|/ ");
+    (void) mvaddstr(SYBASE+2, SXBASE, "h-+-l    4-+-6");
+    (void) mvaddstr(SYBASE+3, SXBASE, " /|\\      /|\\ ");
+    (void) 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 = (ship_t *)NULL;
+    do {
+	extern char *strchr();
+	static char getcoord();
+	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')
+	    (void) 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)
+	{
+	    (void)clearok(stdscr, TRUE);
+	    (void)refresh();
+	}
+	else if (c == 'r')
+	{
+	    prompt(1, "Random-placing your %s", ss->name);
+	    randomplace(PLAYER, ss);
+	    placeship(PLAYER, ss, TRUE);
+	    error((char *)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((char *)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((char *)NULL);
+		ss->placed = TRUE;
+	    }
+	}
+
+	for (unplaced = i = 0; i < SHIPTYPES; i++)
+	    unplaced += !plyship[i].placed;
+    } while
+	(unplaced);
+
+    turn = rnd(2);
+
+    (void) mvprintw(HYBASE,  HXBASE,
+		    "To fire, move the cursor to your chosen aiming point   ");
+    (void) mvprintw(HYBASE+1,  HXBASE,
+		    "and strike any key other than a motion key.            ");
+    (void) mvprintw(HYBASE+2,  HXBASE,
+		    "                                                       ");
+    (void) mvprintw(HYBASE+3,  HXBASE,
+		    "                                                       ");
+    (void) mvprintw(HYBASE+4,  HXBASE,
+		    "                                                       ");
+    (void) mvprintw(HYBASE+5,  HXBASE,
+		    "                                                       ");
+
+    (void) prompt(0, "Press any key to start...");
+    (void) getch();
+}
+
+static int getcoord(atcpu)
+int atcpu;
+{
+    int ny, nx, c;
+
+    if (atcpu)
+	cgoto(cury,curx);
+    else
+	pgoto(cury, curx);
+    (void)refresh();
+    for (;;)
+    {
+	if (atcpu)
+	{
+	    (void) mvprintw(CYBASE + BDEPTH+1, CXBASE+11, "(%d, %c)", curx, 'A'+cury);
+	    cgoto(cury, curx);
+	}
+	else
+	{
+	    (void) 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;
+	    (void)clearok(stdscr, TRUE);
+	    (void)refresh();
+	    break;
+	default:
+	    if (atcpu)
+		(void) mvaddstr(CYBASE + BDEPTH + 1, CXBASE + 11, "      ");
+	    else
+		(void) mvaddstr(PYBASE + BDEPTH + 1, PXBASE + 11, "      ");
+	    return(c);
+	}
+
+	curx = nx % BWIDTH;
+	cury = ny % BDEPTH;
+    }
+}
+
+static int collidecheck(b, y, x)
+/* is this location on the selected zboard adjacent to a ship? */
+int b;
+int y, x;
+{
+    int	collide;
+
+    /* anything on the square */
+    if (collide = IS_SHIP(board[b][x][y]))
+	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(b, ss, vis)
+int b;
+ship_t *ss;
+int vis;
+{
+    int l, xend, yend;
+
+    /* first, check for board edges */
+    xend = ss->x + ss->length * xincr[ss->dir];
+    yend = ss->y + ss->length * 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()
+{
+    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);
+}
+
+static ship_t *hitship(x, y)
+/* register a hit on the targeted ship */
+int x, 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((ship_t *)NULL);
+    for(ss = sb; ss < sb + SHIPTYPES; ++ss)
+	if(ss->symbol == sym)
+	{
+	    if (++ss->hits < ss->length)	/* still afloat? */
+		return((ship_t *)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 x, y;
+
+			    x = bx + i * xincr[ss->dir];
+			    y = by + i * yincr[ss->dir];
+			    if (ONBOARD(x, y))
+			    {
+				hits[turn][x][y] = MARK_MISS;
+				if (turn % 2 == PLAYER)
+				{
+				    cgoto(y, x);
+#ifdef A_COLOR
+				    if (has_colors())
+					attron(COLOR_PAIR(COLOR_GREEN));
+#endif /* A_COLOR */
+				    (void)addch(MARK_MISS);
+#ifdef A_COLOR
+				    attrset(0);
+#endif /* A_COLOR */
+				}
+			    }
+			}
+		    }
+
+		for (i = 0; i < ss->length; ++i)
+		{
+		    int x = ss->x + i * xincr[ss->dir];
+		    int y = ss->y + i * yincr[ss->dir];
+
+		    hits[turn][x][y] = ss->symbol;
+		    if (turn % 2 == PLAYER)
+		    {
+			cgoto(y, x);
+			(void) addch(ss->symbol);
+		    }
+		}
+
+		(void) move(oldy, oldx);
+		return(ss);
+	    }
+	}
+    (void) move(oldy, oldx);
+    return((ship_t *)NULL);
+}
+
+static int plyturn()
+{
+    ship_t *ss;
+    bool hit;
+    char *m;
+
+    prompt(1, "Where do you want to shoot? ");
+    for (;;)
+    {
+	(void) 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 */
+    (void) 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 my %s, I hope...!";
+	    break;
+	}
+	(void)printw(m, ss->name);
+	(void)beep();
+	return(awinna() == -1);
+    }
+    return(hit);
+}
+
+static int sgetc(s)
+char *s;
+{
+    char *s1;
+    int ch;
+
+    (void)refresh();
+    for(;;)
+    {
+	ch = getch();
+	if (islower(ch))
+	    ch = toupper(ch);
+	if (ch == CTRLC)
+	    uninitgame();
+	for (s1=s; *s1 && ch != *s1; ++s1)
+	    continue;
+	if (*s1)
+	{
+	    (void) addch((chtype)ch);
+	    (void)refresh();
+	    return(ch);
+	    }
+	}
+}
+
+
+static void randomfire(px, py)
+/* random-fire routine -- implements simple diagonal-striping strategy */
+int	*px, *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
+
+static bool cpufire(x, y)
+/* fire away at given location */
+int	x, y;
+{
+    bool hit, sunk;
+    ship_t *ss;
+
+    hits[COMPUTER][x][y] = (hit = (board[PLAYER][x][y])) ? MARK_HIT : MARK_MISS;
+    (void) mvprintw(PROMPTLINE, 0,
+	"I shoot at %c%d. I %s!", y + 'A', x, hit ? "hit" : "miss");
+    if (sunk = (hit && (ss = hitship(x, y))))
+	(void) printw(" I've sunk your %s", ss->name);
+    (void)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 */
+    (void)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()
+{
+#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)
+    {
+	(void)refresh();
+	(void)sleep(1);
+    }
+    if (awinna() != -1)
+	return(FALSE);
+
+#ifdef DEBUG
+    (void) mvprintw(PROMPTLINE + 2, 0,
+		    "New state %d, x=%d, y=%d, d=%d",
+		    next, x, y, d);
+#endif /* DEBUG */
+    return(hit);
+}
+
+playagain()
+{
+    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]);
+	    (void)addch((chtype)ss->symbol);
+	}
+
+    if(awinna())
+	++cpuwon;
+    else
+	++plywon;
+    j = 18 + strlen(name);
+    if(plywon >= 10)
+	++j;
+    if(cpuwon >= 10)
+	++j;
+    (void) 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 do_options(c,op)
+int c;
+char *op[];
+{
+    register int i;
+
+    if (c > 1)
+    {
+	for (i=1; i<c; i++)
+	{
+	    switch(op[i][0])
+	    {
+	    default:
+	    case '?':
+		(void) fprintf(stderr, "Usage: battle [-s | -b] [-c]\n");
+		(void) fprintf(stderr, "\tWhere the options are:\n");
+		(void) fprintf(stderr, "\t-s : play a salvo game\n");
+		(void) fprintf(stderr, "\t-b : play a blitz game\n");
+		(void) fprintf(stderr, "\t-c : ships may be adjacent\n");
+		exit(1);
+		break;
+	    case '-':
+		switch(op[i][1])
+		{
+		case 'b':
+		    blitz = 1;
+		    if (salvo == 1)
+		    {
+			(void) fprintf(stderr,
+				"Bad Arg: -b and -s are mutually exclusive\n");
+			exit(1);
+		    }
+		    break;
+		case 's':
+		    salvo = 1;
+		    if (blitz == 1)
+		    {
+			(void) fprintf(stderr,
+				"Bad Arg: -s and -b are mutually exclusive\n");
+			exit(1);
+		    }
+		    break;
+		case 'c':
+		    closepack = 1;
+		    break;
+		default:
+		    (void) fprintf(stderr,
+			    "Bad arg: type \"%s ?\" for usage message\n", op[0]);
+		    exit(1);
+		}
+	    }
+	}
+    }
+}
+
+static int scount(who)
+int who;
+{
+    register int i, shots;
+    register 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);
+}
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+    do_options(argc, argv);
+
+    intro();
+    do {
+	initgame();
+	while(awinna() == -1)
+	{
+	    if (!blitz)
+	    {
+		if (!salvo)
+		{
+	    	    if(turn)
+			(void) cputurn();
+		    else
+			(void) plyturn();
+		}
+		else
+		{
+		    register int i;
+
+		    i = scount(turn);
+		    while (i--)
+		    {
+			if (turn)
+			{
+			    if (cputurn() && awinna() != -1)
+				i = 0;
+			}
+			else
+			{
+			    if (plyturn() && awinna() != -1)
+				i = 0;
+			}
+		    }
+		}
+	    }
+	    else
+	    	while(turn ? cputurn() : plyturn())
+		    continue;
+	    turn = OTHER;
+	}
+    } while
+	(playagain());
+    uninitgame();
+    /*NOTREACHED*/
+}
+
+/* bs.c ends here */