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bs.c

/* 
 * 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.
 * v2.1 with ncurses mouse support, September 1995
 *
 * $Id: bs.c,v 1.39 2003/12/06 18:10:13 tom Exp $
 */

#include <time.h>

#include <test.priv.h>

#ifndef SIGIOT
#define SIGIOT SIGABRT
#endif

static int getcoord(int);

/*
 * 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(UChar(c)) ? TRUE : FALSE)

/* 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 CYINV(y)  ((y) - CYBASE)
#define CXINV(x)  (((x) - CXBASE) / 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 */
    int hits;                 /* how many times has this ship been hit? */
    char symbol;        /* symbol for game purposes */
    int length;               /* length of ship */
    int x, y;                 /* coordinates of ship start point */
    int dir;                  /* direction of `bow' */
    bool placed;        /* has it been placed on the board? */
} ship_t;

static bool checkplace(int b, ship_t * ss, int vis);

#define SHIPIT(name, symbol, length) { name, 0, symbol, length, 0,0, 0, FALSE }

static ship_t plyship[SHIPTYPES] =
{
    SHIPIT(carrier, 'A', 5),
    SHIPIT(battle, 'B', 4),
    SHIPIT(destroy, 'D', 3),
    SHIPIT(sub, 'S', 3),
    SHIPIT(ptboat, 'P', 2),
};

static ship_t cpuship[SHIPTYPES] =
{
    SHIPIT(carrier, 'A', 5),
    SHIPIT(battle, 'B', 4),
    SHIPIT(destroy, 'D', 3),
    SHIPIT(sub, 'S', 3),
    SHIPIT(ptboat, 'P', 2),
};

/* "Hits" board, and main board. */
static char hits[2][BWIDTH][BDEPTH];
static char 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 RETSIGTYPE uninitgame(int sig) GCC_NORETURN;

static RETSIGTYPE uninitgame(int sig GCC_UNUSED)
/* end the game, either normally or due to signal */
{
    clear();
    (void) refresh();
    (void) reset_shell_mode();
    (void) echo();
    (void) endwin();
    ExitProgram(sig ? EXIT_FAILURE : EXIT_SUCCESS);
}

static void
announceopts(void)
/* 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(void)
{
    char *tmpname;

    srand((unsigned) (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()) != 0) {
      (void) strcpy(name, tmpname);
      name[0] = toupper(name[0]);
    } else
      (void) strcpy(name, dftname);

    (void) initscr();
    keypad(stdscr, TRUE);
    (void) def_prog_mode();
    (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 */

#ifdef NCURSES_MOUSE_VERSION
    (void) mousemask(BUTTON1_CLICKED, (mmask_t *) NULL);
#endif /* NCURSES_MOUSE_VERSION */
}

/* VARARGS1 */
static void
prompt(int n, const char *f, const char *s)
/* print a message at the prompt line */
{
    (void) move(PROMPTLINE + n, 0);
    (void) clrtoeol();
    (void) printw(f, s);
    (void) refresh();
}

static void
error(NCURSES_CONST char *s)
{
    (void) move(PROMPTLINE + 2, 0);
    (void) clrtoeol();
    if (s) {
      (void) addstr(s);
      (void) 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);
          (void) addch((chtype) ss->symbol);
      }
    }
    ss->hits = 0;
}

static int
rnd(int n)
{
    return (((rand() & 0x7FFF) % n));
}

static void
randomplace(int b, ship_t * ss)
/* generate a valid random ship placement into px,py */
{

    do {
      ss->dir = rnd(2) ? E : S;
      ss->x = rnd(BWIDTH - (ss->dir == E ? ss->length : 0));
      ss->y = rnd(BDEPTH - (ss->dir == S ? ss->length : 0));
    } while
      (!checkplace(b, ss, FALSE));
}

static void
initgame(void)
{
    int i, j, unplaced;
    ship_t *ss;

    (void) clear();
    (void) mvaddstr(0, 35, "BATTLESHIPS");
    (void) move(PROMPTLINE + 2, 0);
    announceopts();

    memset(board, 0, sizeof(char) * BWIDTH * BDEPTH * 2);
    memset(hits, 0, sizeof(char) * BWIDTH * BDEPTH * 2);
    for (i = 0; i < SHIPTYPES; i++) {
      ss = cpuship + i;

      ss->x =
          ss->y =
          ss->dir =
          ss->hits = 0;
      ss->placed = FALSE;

      ss = plyship + i;

      ss->x =
          ss->y =
          ss->dir =
          ss->hits = 0;
      ss->placed = FALSE;
    }

    /* 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, (chtype) (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((chtype) (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, (chtype) (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((chtype) (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 {
      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(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':
      case KEY_UP:
          ny = cury + BDEPTH - 1;
          nx = curx;
          break;
      case 'j':
      case '2':
      case KEY_DOWN:
          ny = cury + 1;
          nx = curx;
          break;
      case 'h':
      case '4':
      case KEY_LEFT:
          ny = cury;
          nx = curx + BWIDTH - 1;
          break;
      case 'l':
      case '6':
      case KEY_RIGHT:
          ny = cury;
          nx = curx + 1;
          break;
      case 'y':
      case '7':
      case KEY_A1:
          ny = cury + BDEPTH - 1;
          nx = curx + BWIDTH - 1;
          break;
      case 'b':
      case '1':
      case KEY_C1:
          ny = cury + 1;
          nx = curx + BWIDTH - 1;
          break;
      case 'u':
      case '9':
      case KEY_A3:
          ny = cury + BDEPTH - 1;
          nx = curx + 1;
          break;
      case 'n':
      case '3':
      case KEY_C3:
          ny = cury + 1;
          nx = curx + 1;
          break;
      case FF:
          nx = curx;
          ny = cury;
          (void) clearok(stdscr, TRUE);
          (void) refresh();
          break;
#ifdef NCURSES_MOUSE_VERSION
      case KEY_MOUSE:
          {
            MEVENT myevent;

            getmouse(&myevent);
            if (atcpu
                && myevent.y >= CY(0) && myevent.y <= CY(BDEPTH)
                && myevent.x >= CX(0) && myevent.x <= CX(BDEPTH)) {
                curx = CXINV(myevent.x);
                cury = CYINV(myevent.y);
                return (' ');
            } else {
                beep();
                continue;
            }
          }
          /* no fall through */
#endif /* NCURSES_MOUSE_VERSION */

      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 bool
collidecheck(int b, int y, int x)
/* is this location on the selected zboard adjacent to a ship? */
{
    bool collide;

    /* anything on the square */
    if ((collide = IS_SHIP(board[b][x][y])) != FALSE)
      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)
            && IS_SHIP(board[b][xend][yend])) {
            collide = TRUE;
            break;
          }
      }
    }
    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 (FALSE);
    }

    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);
}

static ship_t *
hitship(int x, int y)
/* register a hit on the targeted ship */
{
    ship_t *sb, *ss;
    char sym;
    int oldx, oldy;

    getyx(stdscr, oldy, oldx);
    sb = (turn) ? plyship : cpuship;
    if ((sym = board[OTHER][x][y]) == 0)
      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 x1, y1;

                      x1 = bx + i * xincr[ss->dir];
                      y1 = by + i * yincr[ss->dir];
                      if (ONBOARD(x1, y1)) {
                        hits[turn][x1][y1] = MARK_MISS;
                        if (turn % 2 == PLAYER) {
                            cgoto(y1, x1);
#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 */
                        } else {
                            pgoto(y1, x1);
                            (void) addch(SHOWSPLASH);
                        }
                      }
                  }
                }

            for (i = 0; i < ss->length; ++i) {
                int x1 = ss->x + i * xincr[ss->dir];
                int y1 = ss->y + i * yincr[ss->dir];

                hits[turn][x1][y1] = ss->symbol;
                if (turn % 2 == PLAYER) {
                  cgoto(y1, x1);
                  (void) addch((chtype) (ss->symbol));
                } else {
                  pgoto(y1, x1);
#ifdef A_COLOR
                  if (has_colors())
                      attron(COLOR_PAIR(COLOR_RED));
#endif /* A_COLOR */
                  (void) addch(SHOWHIT);
#ifdef A_COLOR
                  attrset(0);
#endif /* A_COLOR */
                }
            }

            (void) move(oldy, oldx);
            return (ss);
          }
      }
    (void) move(oldy, oldx);
    return ((ship_t *) NULL);
}

static bool
plyturn(void)
{
    ship_t *ss;
    bool hit;
    NCURSES_CONST char *m = NULL;

    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 %s, I hope...!";
          break;
      }
      (void) printw(m, ss->name);
      (void) beep();
      return (awinna() == -1);
    }
    return (hit);
}

static int
sgetc(const char *s)
{
    const char *s1;
    int ch;

    (void) refresh();
    for (;;) {
      ch = getch();
      if (islower(ch))
          ch = toupper(ch);
      if (ch == CTRLC)
          uninitgame(0);
      for (s1 = s; *s1 && ch != *s1; ++s1)
          continue;
      if (*s1) {
          (void) addch((chtype) ch);
          (void) refresh();
          return (ch);
      }
    }
}

static void
randomfire(int *px, int *py)
/* random-fire routine -- implements simple diagonal-striping strategy */
{
    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!");
      ExitProgram(EXIT_FAILURE);
      /*NOTREACHED */
    }
}

#define S_MISS    0
#define S_HIT     1
#define S_SUNK    -1

static int
cpufire(int x, int y)
/* fire away at given location */
{
    bool hit, sunk;
    ship_t *ss = NULL;

    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)))) != 0)
      (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) ? TRUE : FALSE);
}

/*
 * 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;
    int 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) ? TRUE : FALSE);
}

static 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]);
          (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(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");
            ExitProgram(EXIT_FAILURE);
            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");
                  ExitProgram(EXIT_FAILURE);
                }
                break;
            case 's':
                salvo = 1;
                if (blitz == 1) {
                  (void) fprintf(stderr,
                               "Bad Arg: -s and -b are mutually exclusive\n");
                  ExitProgram(EXIT_FAILURE);
                }
                break;
            case 'c':
                closepack = 1;
                break;
            default:
                (void) fprintf(stderr,
                           "Bad arg: type \"%s ?\" for usage message\n",
                           op[0]);
                ExitProgram(EXIT_FAILURE);
            }
          }
      }
    }
}

static int
scount(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);
}

int
main(int argc, char *argv[])
{
    setlocale(LC_ALL, "");

    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(0);
    /*NOTREACHED */
}

/* bs.c ends here */

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