/****************************************************************************
- * Copyright (c) 1998-2012,2013 Free Software Foundation, Inc. *
+ * Copyright 2018-2020,2021 Thomas E. Dickey *
+ * Copyright 1998-2013,2017 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* Eric S. Raymond <esr@snark.thyrsus.com> July 22 1995. Mouse support
* added September 20th 1995.
*
- * $Id: knight.c,v 1.34 2013/01/13 00:40:33 tom Exp $
+ * $Id: knight.c,v 1.49 2021/05/08 19:32:15 tom Exp $
*/
#include <test.priv.h>
/* board size */
-#define BDEPTH 8
-#define BWIDTH 8
+#define YLIMIT 8
+#define XLIMIT 8
+#define MAXMOVES (ylimit * xlimit)
/* where to start the instructions */
-#define INSTRY 2
-#define INSTRX 35
+#define INSTRY 2
+#define INSTRX 35
/* corner of board */
-#define BOARDY 2
-#define BOARDX 0
+#define BOARDY 2
+#define BOARDX 0
/* notification line */
-#define NOTIFYY 21
+#define NOTIFYY 21
/* virtual color values */
#define TRAIL_COLOR 1
#define CYINV(y) (((y) - 2) / 2)
typedef struct {
- short x, y;
-} cell;
+ int x, y;
+} HISTORY;
+
+typedef int SQUARES[YLIMIT][XLIMIT];
static WINDOW *boardwin; /* the board window */
static WINDOW *helpwin; /* the help window */
static WINDOW *msgwin; /* the message window */
-static cell history[BDEPTH * BWIDTH + 1]; /* choice history */
+
+#if HAVE_USE_DEFAULT_COLORS
+static bool d_option;
+#endif
+
static chtype minus = '-'; /* possible-move character */
static chtype oldch;
static chtype plus = '+'; /* cursor hot-spot character */
static chtype trail = '#'; /* trail character */
-static int movecount; /* count of moves so far */
-static int trialcount; /* count of trials so far */
-static short board[BDEPTH][BWIDTH]; /* the squares */
+
+static int ylimit = YLIMIT;
+static int xlimit = XLIMIT;
+static int maxmoves = (YLIMIT * XLIMIT);
+
+static int count_tries; /* count of trials so far */
+static int test_test; /* FIXME */
/* *INDENT-OFF* */
static const struct {
int y;
{ 1, -2 },
{ 2, -1 },
};
+#define MAX_OFFSET (unsigned)SIZEOF(offsets)
/* *INDENT-ON* */
static void
initscr();
cbreak(); /* immediate char return */
noecho(); /* no immediate echo */
- boardwin = newwin(BDEPTH * 2 + 1, BWIDTH * 4 + 1, BOARDY, BOARDX);
+
+ maxmoves = MAXMOVES;
+ boardwin = newwin(ylimit * 2 + 1, xlimit * 4 + 1, BOARDY, BOARDX);
helpwin = newwin(0, 0, INSTRY, INSTRX);
msgwin = newwin(1, INSTRX - 1, NOTIFYY, 0);
+
scrollok(msgwin, TRUE);
keypad(boardwin, TRUE);
start_color();
#if HAVE_USE_DEFAULT_COLORS
- if (use_default_colors() == OK)
+ if (d_option && (use_default_colors() == OK))
bg = -1;
#endif
#ifdef NCURSES_MOUSE_VERSION
(void) mousemask(BUTTON1_CLICKED, (mmask_t *) NULL);
#endif /* NCURSES_MOUSE_VERSION */
+#if defined(PDCURSES)
+ mouse_set(BUTTON1_RELEASED);
+#endif
oldch = minus;
}
(void) waddstr(helpwin, "r -- redraw screen \\|/ \\|/ \n");
(void) waddstr(helpwin, "bksp -- undo move h-+-l 4-+-6\n");
(void) waddstr(helpwin, "a -- autojump /|\\ /|\\ \n");
- (void) waddstr(helpwin, " b j n 1 2 3\n");
+ if (ylimit <= 6) {
+ (void) waddstr(helpwin, "R -- solve (slow) b j n 1 2 3\n");
+ } else {
+ (void) waddstr(helpwin, " b j n 1 2 3\n");
+ }
(void) waddstr(helpwin, "\nYou can place your knight on the selected\n");
(void) waddstr(helpwin, "square with spacebar, Enter, or the keypad\n");
wrefresh(helpwin);
}
-static bool
-chksqr(int r1, int c1)
+static inline bool
+isValidYX(int y, int x)
{
- if ((r1 < 0) || (r1 > BDEPTH - 1))
- return (FALSE);
- if ((c1 < 0) || (c1 > BWIDTH - 1))
- return (FALSE);
- return ((!board[r1][c1]) ? TRUE : FALSE);
+ return (y >= 0 && y < ylimit && x >= 0 && x < xlimit) ? TRUE : FALSE;
+}
+
+static inline bool
+isUnusedYX(SQUARES squares, int y, int x)
+{
+ return (isValidYX(y, x) && (!squares[y][x]) ? TRUE : FALSE);
}
static bool
-chkmoves(int rw, int col)
-/* check to see if valid moves are available */
+boardIsFilled(SQUARES squares, int y, int x)
{
unsigned n;
- for (n = 0; n < SIZEOF(offsets); n++)
- if (chksqr(rw + offsets[n].y, col + offsets[n].x))
- return (TRUE);
- return (FALSE);
+ for (n = 0; n < MAX_OFFSET; n++) {
+ if (isUnusedYX(squares, y + offsets[n].y, x + offsets[n].x)) {
+ return FALSE;
+ }
+ }
+ return TRUE;
}
static void
-dosquares(void)
+drawBoard(void)
{
int i, j;
move(BOARDY, BOARDX);
waddch(boardwin, ACS_ULCORNER);
- for (j = 0; j < 7; j++) {
+ for (j = 0; j < (ylimit - 1); j++) {
waddch(boardwin, ACS_HLINE);
waddch(boardwin, ACS_HLINE);
waddch(boardwin, ACS_HLINE);
waddch(boardwin, ACS_HLINE);
waddch(boardwin, ACS_URCORNER);
- for (i = 1; i < BDEPTH; i++) {
+ for (i = 1; i < ylimit; i++) {
move(BOARDY + i * 2 - 1, BOARDX);
waddch(boardwin, ACS_VLINE);
- for (j = 0; j < BWIDTH; j++) {
+ for (j = 0; j < xlimit; j++) {
waddch(boardwin, ' ');
waddch(boardwin, ' ');
waddch(boardwin, ' ');
}
move(BOARDY + i * 2, BOARDX);
waddch(boardwin, ACS_LTEE);
- for (j = 0; j < BWIDTH - 1; j++) {
+ for (j = 0; j < xlimit - 1; j++) {
waddch(boardwin, ACS_HLINE);
waddch(boardwin, ACS_HLINE);
waddch(boardwin, ACS_HLINE);
move(BOARDY + i * 2 - 1, BOARDX);
waddch(boardwin, ACS_VLINE);
- for (j = 0; j < BWIDTH; j++) {
+ for (j = 0; j < xlimit; j++) {
waddch(boardwin, ' ');
waddch(boardwin, ' ');
waddch(boardwin, ' ');
move(BOARDY + i * 2, BOARDX);
waddch(boardwin, ACS_LLCORNER);
- for (j = 0; j < BWIDTH - 1; j++) {
+ for (j = 0; j < xlimit - 1; j++) {
waddch(boardwin, ACS_HLINE);
waddch(boardwin, ACS_HLINE);
waddch(boardwin, ACS_HLINE);
}
static void
-mark_possibles(int prow, int pcol, chtype mark)
+mark_possibles(SQUARES squares, int y, int x, chtype mark)
{
unsigned n;
- for (n = 0; n < SIZEOF(offsets); n++) {
- if (chksqr(prow + offsets[n].y, pcol + offsets[n].x)) {
- cellmove(prow + offsets[n].y, pcol + offsets[n].x);
+ for (n = 0; n < MAX_OFFSET; n++) {
+ if (isUnusedYX(squares, y + offsets[n].y, x + offsets[n].x)) {
+ cellmove(y + offsets[n].y, x + offsets[n].x);
waddch(boardwin, mark);
}
}
}
static bool
-find_next_move(int *y, int *x)
+find_next_move(SQUARES squares, HISTORY * doneData, int doneSize, int *y, int *x)
{
- unsigned j, k;
- int found = -1;
- int first = -1;
- int next = 0;
- int oldy, oldx;
- int newy, newx;
bool result = FALSE;
- if (movecount > 1) {
- oldy = history[movecount - 1].y;
- oldx = history[movecount - 1].x;
- for (j = 0; j < SIZEOF(offsets) * 2; j++) {
- k = j % SIZEOF(offsets);
- newy = oldy + offsets[k].y;
- newx = oldx + offsets[k].x;
- if (chksqr(newy, newx)) {
+ if (doneSize > 1) {
+ unsigned j;
+ int oldy = doneData[doneSize - 1].y;
+ int oldx = doneData[doneSize - 1].x;
+ int found = -1;
+ int first = -1;
+ int next = -1;
+
+ for (j = 0; j < MAX_OFFSET * 2; j++) {
+ unsigned k = j % MAX_OFFSET;
+ int newy = oldy + offsets[k].y;
+ int newx = oldx + offsets[k].x;
+ if (isUnusedYX(squares, newy, newx)) {
if (first < 0)
first = (int) k;
if (newy == *y
}
static void
-count_next_moves(int y, int x)
+count_next_moves(SQUARES squares, int count_moves, int y, int x)
{
int count = 0;
unsigned j;
- wprintw(msgwin, "\nMove %d", movecount);
- for (j = 0; j < SIZEOF(offsets); j++) {
+ wprintw(msgwin, "\nMove %d", count_moves);
+ for (j = 0; j < MAX_OFFSET; j++) {
int newy = y + offsets[j].y;
int newx = x + offsets[j].x;
- if (chksqr(newy, newx)) {
+ if (isUnusedYX(squares, newy, newx)) {
++count;
}
}
}
static void
-drawmove(chtype tchar, int oldy, int oldx, int row, int column)
+drawMove(SQUARES squares, int count_moves, chtype tchar, int oldy, int oldx, int
+ row, int column)
/* place the stars, update board & currents */
{
- if (movecount <= 1) {
+ if (count_moves <= 1) {
int i, j;
- for (i = 0; i < BDEPTH; i++) {
- for (j = 0; j < BWIDTH; j++) {
- if (movecount == 0) {
+ for (i = 0; i < ylimit; i++) {
+ for (j = 0; j < xlimit; j++) {
+ if (count_moves == 0) {
unmarkcell(i, j);
} else {
cellmove(i, j);
if (winch(boardwin) == minus)
- waddch(boardwin, movecount ? ' ' : minus);
+ waddch(boardwin, ' ');
}
}
}
} else {
markcell(tchar, oldy, oldx);
- mark_possibles(oldy, oldx, ' ');
+ mark_possibles(squares, oldy, oldx, ' ');
}
if (row >= 0 && column >= 0) {
markcell(trail, row, column);
- mark_possibles(row, column, minus);
- board[row][column] = TRUE;
+ mark_possibles(squares, row, column, minus);
+ squares[row][column] = TRUE;
}
- wprintw(msgwin, "\nMove %d", movecount);
- if (trialcount != movecount)
- wprintw(msgwin, " (%d tries)", trialcount);
+ wprintw(msgwin, "\nMove %d", count_moves);
+ if (count_tries != count_moves)
+ wprintw(msgwin, " (%d tries)", count_tries);
wclrtoeol(msgwin);
}
}
static bool
-evalmove(int row, int column)
-/* evaluate move */
+evaluate_move(SQUARES squares, HISTORY * doneData, int doneSize, int row, int column)
{
- if (movecount == 1)
+ if (doneSize <= 1)
return (TRUE);
- else if (board[row][column] == TRUE) {
+ else if (squares[row][column] == TRUE) {
waddstr(msgwin, "\nYou've already been there.");
return (FALSE);
} else {
- int rdif = iabs(row - history[movecount - 1].y);
- int cdif = iabs(column - history[movecount - 1].x);
+ int rdif = iabs(row - doneData[doneSize - 1].y);
+ int cdif = iabs(column - doneData[doneSize - 1].x);
if (!((rdif == 1) && (cdif == 2)) && !((rdif == 2) && (cdif == 1))) {
waddstr(msgwin, "\nThat's not a legal knight's move.");
}
static int
-completed(void)
+completed(SQUARES squares)
{
int i, j, count = 0;
- for (i = 0; i < BDEPTH; i++)
- for (j = 0; j < BWIDTH; j++)
- if (board[i][j] != 0)
+ for (i = 0; i < ylimit; i++) {
+ for (j = 0; j < xlimit; j++) {
+ if (squares[i][j] != 0) {
count += 1;
- return (count == (BWIDTH * BDEPTH) ? -1 : count);
+ }
+ }
+ }
+ return ((count == maxmoves) ? -1 : count);
}
static void
beep();
}
+/* Recursively try all possible moves, starting from (y,x) */
+static int
+recurBack(SQUARES squares, int y, int x, int total)
+{
+ int longest = total;
+ int best_x = x;
+ int best_y = y;
+ int result;
+
+ if (total < maxmoves) {
+ unsigned k;
+
+ for (k = 0; k < MAX_OFFSET; k++) {
+ int try_x = x + offsets[k].x;
+ int try_y = y + offsets[k].y;
+ if (isUnusedYX(squares, try_y, try_x)) {
+ ++test_test;
+ squares[try_y][try_x] = total + 1;
+ result = recurBack(squares, try_y, try_x, total + 1);
+ if (result > longest) {
+ longest = result;
+ best_x = try_x;
+ best_y = try_y;
+ }
+ if (result >= maxmoves)
+ break;
+ squares[try_y][try_x] = 0; /* allow retry... */
+ }
+ }
+ }
+
+ result = total;
+ if (longest > total) {
+ result = longest;
+ squares[best_y][best_x] = total + 1;
+ (void) recurBack(squares, best_y, best_x, total + 1);
+ if (result < maxmoves)
+ squares[best_y][best_x] = 0;
+ }
+
+ return result;
+}
+
+/*
+ * Solve the Knight Tour problem using backtracking, returning the length of
+ * the resulting solution. If this is invoked from a point where the remaining
+ * choices cannot complete the tour, the result will fall short.
+ */
+static int
+useBacktracking(SQUARES result, HISTORY * doneData, int doneSize)
+{
+ int y = 0, x = 0, n;
+ SQUARES squares;
+ int total;
+ int actual = doneSize - 1;
+
+ memset(squares, 0, sizeof(squares));
+ for (n = 1; n <= actual; ++n) {
+ y = doneData[n].y;
+ x = doneData[n].x;
+ squares[y][x] = n;
+ }
+
+ total = recurBack(squares, y, x, actual);
+ if (total > actual) {
+ for (y = 0; y < ylimit; ++y) {
+ for (x = 0; x < xlimit; ++x) {
+ result[y][x] = squares[y][x];
+ if ((n = squares[y][x]) != 0) {
+ doneData[n].y = y;
+ doneData[n].x = x;
+ }
+ }
+ }
+ }
+ return total;
+}
+
+static int
+reviewHistory(HISTORY * history, int count_moves, int review, int *ny, int *nx)
+{
+ if (review < 0) {
+ beep();
+ review = 0;
+ } else if (review > count_moves - 2) {
+ beep();
+ review = count_moves - 2;
+ } else {
+ *ny = history[count_moves - review - 1].y;
+ *nx = history[count_moves - review - 1].x;
+ wprintw(msgwin, "\nReview %d:%d.", count_moves - review - 1,
+ count_moves - 1);
+ wrefresh(msgwin);
+ }
+ return review;
+}
+
static void
play(void)
/* play the game */
{
bool keyhelp; /* TRUE if keystroke help is up */
int i, j, count;
- int lastcol = 0; /* last location visited */
- int lastrow = 0;
+ int lastcol; /* last location visited */
+ int lastrow;
int ny = 0, nx = 0;
int review = 0; /* review history */
+ int test_size;
int rw = 0, col = 0; /* current row and column */
do {
+ SQUARES squares;
+ HISTORY history[(YLIMIT * XLIMIT) + 1];
+ int count_moves = 0; /* count of moves so far */
+
/* clear screen and draw board */
werase(boardwin);
werase(helpwin);
werase(msgwin);
- dosquares();
+ drawBoard();
help1();
wnoutrefresh(stdscr);
wnoutrefresh(helpwin);
wnoutrefresh(boardwin);
doupdate();
- movecount = 0;
- for (i = 0; i < BDEPTH; i++) {
- for (j = 0; j < BWIDTH; j++) {
- board[i][j] = FALSE;
+ for (i = 0; i < ylimit; i++) {
+ for (j = 0; j < xlimit; j++) {
unmarkcell(i, j);
}
}
+ memset(squares, 0, sizeof(squares));
memset(history, 0, sizeof(history));
history[0].y = history[0].x = -1;
history[1].y = history[1].x = -1;
lastrow = lastcol = -2;
- movecount = 1;
- trialcount = 1;
+ count_moves = 1;
+ count_tries = 1;
keyhelp = FALSE;
show_help(&keyhelp);
if (rw != lastrow || col != lastcol) {
if (lastrow >= 0 && lastcol >= 0) {
cellmove(lastrow, lastcol);
- if (board[lastrow][lastcol])
+ if (squares[lastrow][lastcol])
waddch(boardwin, trail);
else
waddch(boardwin, oldch);
case 'k':
case '8':
case KEY_UP:
- ny = rw + BDEPTH - 1;
+ ny = rw + ylimit - 1;
nx = col;
break;
case 'j':
case '4':
case KEY_LEFT:
ny = rw;
- nx = col + BWIDTH - 1;
+ nx = col + xlimit - 1;
break;
case 'l':
case '6':
case 'y':
case '7':
case KEY_A1:
- ny = rw + BDEPTH - 1;
- nx = col + BWIDTH - 1;
+ ny = rw + ylimit - 1;
+ nx = col + xlimit - 1;
break;
case 'b':
case '1':
case KEY_C1:
ny = rw + 1;
- nx = col + BWIDTH - 1;
+ nx = col + xlimit - 1;
break;
case 'u':
case '9':
case KEY_A3:
- ny = rw + BDEPTH - 1;
+ ny = rw + ylimit - 1;
nx = col + 1;
break;
case 'n':
nx = col + 1;
break;
-#ifdef NCURSES_MOUSE_VERSION
+#ifdef KEY_MOUSE
case KEY_MOUSE:
+#ifdef NCURSES_MOUSE_VERSION
{
MEVENT myevent;
getmouse(&myevent);
- if (myevent.y >= CY(0) && myevent.y <= CY(BDEPTH)
- && myevent.x >= CX(0) && myevent.x <= CX(BWIDTH)) {
+ if (myevent.y >= CY(0) && myevent.y <= CY(ylimit)
+ && myevent.x >= CX(0) && myevent.x <= CX(xlimit)) {
nx = CXINV(myevent.x);
ny = CYINV(myevent.y);
ungetch('\n');
}
}
#endif /* NCURSES_MOUSE_VERSION */
+#ifdef PDCURSES
+ {
+ int test_y, test_x;
+ request_mouse_pos();
+ test_y = MOUSE_Y_POS + 0;
+ test_x = MOUSE_X_POS + 1;
+ if (test_y >= CY(0) && test_y <= CY(ylimit)
+ && test_x >= CX(0) && test_x <= CX(xlimit)) {
+ ny = CYINV(test_y);
+ nx = CXINV(test_x);
+ wmove(helpwin, 0, 0);
+ wrefresh(helpwin);
+ ungetch('\n');
+ }
+ break;
+ }
+#endif /* PDCURSES */
+#endif /* KEY_MOUSE */
case KEY_B2:
case '\n':
case ' ':
review = 0;
- if (evalmove(rw, col)) {
- drawmove(trail,
- history[movecount - 1].y,
- history[movecount - 1].x,
+ if (evaluate_move(squares, history, count_moves, rw, col)) {
+ drawMove(squares,
+ count_moves,
+ trail,
+ history[count_moves - 1].y,
+ history[count_moves - 1].x,
rw, col);
- history[movecount].y = (short) rw;
- history[movecount].x = (short) col;
- movecount++;
- trialcount++;
+ history[count_moves].y = (short) rw;
+ history[count_moves].x = (short) col;
+ count_moves++;
+ count_tries++;
- if (!chkmoves(rw, col)) {
- if (completed() < 0) {
+ if (boardIsFilled(squares, rw, col)) {
+ if (completed(squares) < 0) {
waddstr(msgwin, "\nYou won.");
} else {
waddstr(msgwin,
case KEY_BACKSPACE:
case '\b':
review = 0;
- if (movecount <= 0) {
+ if (count_moves <= 0) {
no_previous_move();
- } else if (movecount <= 1) {
- ny = history[movecount].y;
- nx = history[movecount].x;
+ } else if (count_moves <= 1) {
+ ny = history[count_moves].y;
+ nx = history[count_moves].x;
if (nx < 0 || ny < 0) {
ny = (lastrow >= 0) ? lastrow : 0;
nx = (lastcol >= 0) ? lastcol : 0;
}
- movecount = 0;
- board[ny][nx] = FALSE;
+ count_moves = 0;
+ squares[ny][nx] = FALSE;
oldch = minus;
- drawmove(' ', ny, nx, -1, -1);
- movecount = 1;
- trialcount = 1;
+ drawMove(squares, count_moves, ' ', ny, nx, -1, -1);
+ count_moves = 1;
+ count_tries = 1;
no_previous_move();
} else {
- int oldy = history[movecount - 1].y;
- int oldx = history[movecount - 1].x;
+ int oldy = history[count_moves - 1].y;
+ int oldx = history[count_moves - 1].x;
- if (!board[rw][col]) {
+ if (!squares[rw][col]) {
cellmove(rw, col);
waddch(boardwin, ' ');
}
- board[oldy][oldx] = FALSE;
- --movecount;
- ny = history[movecount - 1].y;
- nx = history[movecount - 1].x;
+ squares[oldy][oldx] = FALSE;
+ --count_moves;
+ ny = history[count_moves - 1].y;
+ nx = history[count_moves - 1].x;
if (nx < 0 || ny < 0) {
ny = oldy;
nx = oldx;
}
- drawmove(' ', oldy, oldx, ny, nx);
+ drawMove(squares, count_moves, ' ', oldy, oldx, ny, nx);
/* avoid problems if we just changed the current cell */
cellmove(lastrow, lastcol);
case 'a':
nx = col;
ny = rw;
- if (find_next_move(&ny, &nx))
- count_next_moves(ny, nx);
+ if (find_next_move(squares, history, count_moves, &ny, &nx))
+ count_next_moves(squares, count_moves, ny, nx);
else
beep();
break;
case 'F':
- if (review > 0) {
- review--;
- ny = history[movecount - review - 1].y;
- nx = history[movecount - review - 1].x;
- } else {
- beep();
- }
+ review = reviewHistory(history, count_moves, review - 1,
+ &ny, &nx);
break;
case 'B':
- if (review < movecount - 2) {
- review++;
- ny = history[movecount - review - 1].y;
- nx = history[movecount - review - 1].x;
+ review = reviewHistory(history, count_moves, review + 1,
+ &ny, &nx);
+ break;
+
+ case 'R':
+ if (ylimit <= 6) {
+ wprintw(msgwin, "\nworking...");
+ wrefresh(msgwin);
+ test_test = 0;
+ test_size = useBacktracking(squares, history, count_moves);
+ wprintw(msgwin, "\nOk %d:%d (%d tests)",
+ test_size, maxmoves, test_test);
+ review = 0;
+ while (count_moves <= test_size) {
+ markcell(trail,
+ ny = history[count_moves].y,
+ nx = history[count_moves].x);
+ count_moves++;
+ }
} else {
- beep();
+ wprintw(msgwin, "\nBoard is too large.");
}
+ wrefresh(msgwin);
break;
+#if HAVE_CURSCR
case KEY_REDO:
case '\f':
case 'r':
wnoutrefresh(helpwin);
doupdate();
break;
+#endif
case 'q':
case 'x':
goto dropout;
- case '?':
+ case HELP_KEY_1:
show_help(&keyhelp);
break;
break;
}
- col = nx % BWIDTH;
- rw = ny % BDEPTH;
+ col = nx % xlimit;
+ rw = ny % ylimit;
}
dropout:
- if ((count = completed()) < 0)
+ if ((count = completed(squares)) < 0)
wprintw(msgwin, "\nYou won. Care to try again? ");
else
wprintw(msgwin, "\n%d squares filled. Try again? ", count);
(tolower(wgetch(msgwin)) == 'y');
}
+static void
+usage(void)
+{
+ static const char *msg[] =
+ {
+ "Usage: knight [options]"
+ ,""
+ ,"Options:"
+#if HAVE_USE_DEFAULT_COLORS
+ ," -d invoke use_default_colors"
+#endif
+ ," -n NUM set board-size to NUM*NUM (default 8x8)"
+ };
+ size_t n;
+
+ for (n = 0; n < SIZEOF(msg); n++)
+ fprintf(stderr, "%s\n", msg[n]);
+
+ ExitProgram(EXIT_FAILURE);
+}
+
int
-main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
+main(int argc, char *argv[])
{
+ int ch;
+
+ while ((ch = getopt(argc, argv, "dn:")) != -1) {
+ switch (ch) {
+#if HAVE_USE_DEFAULT_COLORS
+ case 'd':
+ d_option = TRUE;
+ break;
+#endif
+ case 'n':
+ ch = atoi(optarg);
+ if (ch < 3 || ch > 8) {
+ fprintf(stderr, "board size %d is outside [3..8]\n", ch);
+ usage();
+ }
+ xlimit = ylimit = ch;
+ break;
+ default:
+ usage();
+ /* NOTREACHED */
+ }
+ }
+ if (optind < argc)
+ usage();
+
init_program();
play();
endwin();
ExitProgram(EXIT_SUCCESS);
}
-
-/* knight.c ends here */
projects / ncurses.git / blobdiff