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/*
* Name: Towers of Hanoi.
*
* Desc:
* This is a playable copy of towers of hanoi.
* Its sole purpose is to demonstrate my Amiga Curses package.
* This program should compile on any system that has Curses.
* 'hanoi' will give a manual game with 7 playing pieces.
* 'hanoi n' will give a manual game with n playing pieces.
* 'hanoi n a' will give an auto solved game with n playing pieces.
*
* Author: Simon J Raybould (sie@fulcrum.bt.co.uk).
* (This version has been slightly modified by the ncurses maintainers.)
*
* Date: 05.Nov.90
*
* $Id: hanoi.c,v 1.27 2008/08/04 10:57:59 tom Exp $
*/
#include <test.priv.h>
#define NPEGS 3 /* This is not configurable !! */
#define MINTILES 3
#define MAXTILES 9
#define DEFAULTTILES 7
#define TOPLINE 6
#define BASELINE 16
#define STATUSLINE (LINES-3)
#define LEFTPEG 19
#define MIDPEG 39
#define RIGHTPEG 59
#define LENTOIND(x) (((x)-1)/2)
#define OTHER(a,b) (3-((a)+(b)))
struct Peg {
size_t Length[MAXTILES];
int Count;
};
static struct Peg Pegs[NPEGS];
static int PegPos[] =
{LEFTPEG, MIDPEG, RIGHTPEG};
static int TileColour[] =
{
COLOR_GREEN, /* Length 3 */
COLOR_MAGENTA, /* Length 5 */
COLOR_RED, /* Length 7 */
COLOR_BLUE, /* Length 9 */
COLOR_CYAN, /* Length 11 */
COLOR_YELLOW, /* Length 13 */
COLOR_GREEN, /* Length 15 */
COLOR_MAGENTA, /* Length 17 */
COLOR_RED, /* Length 19 */
};
static int NMoves = 0;
static bool AutoFlag = FALSE;
static void InitTiles(int NTiles);
static void DisplayTiles(void);
static void MakeMove(int From, int To);
static void AutoMove(int From, int To, int Num);
static void Usage(void);
static int Solved(int NumTiles);
static int GetMove(int *From, int *To);
static int InvalidMove(int From, int To);
int
main(int argc, char **argv)
{
int NTiles, FromCol, ToCol;
setlocale(LC_ALL, "");
switch (argc) {
case 1:
NTiles = DEFAULTTILES;
break;
case 2:
NTiles = atoi(argv[1]);
if (NTiles > MAXTILES || NTiles < MINTILES) {
fprintf(stderr, "Range %d to %d\n", MINTILES, MAXTILES);
ExitProgram(EXIT_FAILURE);
}
break;
case 3:
if (strcmp(argv[2], "a")) {
Usage();
ExitProgram(EXIT_FAILURE);
}
NTiles = atoi(argv[1]);
if (NTiles > MAXTILES || NTiles < MINTILES) {
fprintf(stderr, "Range %d to %d\n", MINTILES, MAXTILES);
ExitProgram(EXIT_FAILURE);
}
AutoFlag = TRUE;
break;
default:
Usage();
ExitProgram(EXIT_FAILURE);
}
#ifdef TRACE
trace(TRACE_MAXIMUM);
#endif
initscr();
if (has_colors()) {
int i;
int bg = COLOR_BLACK;
start_color();
#if HAVE_USE_DEFAULT_COLORS
if (use_default_colors() == OK)
bg = -1;
#endif
for (i = 0; i < 9; i++)
init_pair(i + 1, bg, TileColour[i]);
}
cbreak();
if (LINES < 24) {
endwin();
fprintf(stderr, "Min screen length 24 lines\n");
ExitProgram(EXIT_FAILURE);
}
if (AutoFlag) {
curs_set(0);
leaveok(stdscr, TRUE); /* Attempt to remove cursor */
}
InitTiles(NTiles);
DisplayTiles();
if (AutoFlag) {
do {
noecho();
AutoMove(0, 2, NTiles);
} while (!Solved(NTiles));
sleep(2);
} else {
echo();
for (;;) {
if (GetMove(&FromCol, &ToCol))
break;
if (InvalidMove(FromCol, ToCol)) {
mvaddstr(STATUSLINE, 0, "Invalid Move !!");
refresh();
beep();
continue;
}
MakeMove(FromCol, ToCol);
if (Solved(NTiles)) {
mvprintw(STATUSLINE, 0,
"Well Done !! You did it in %d moves", NMoves);
refresh();
sleep(5);
break;
}
}
}
endwin();
ExitProgram(EXIT_SUCCESS);
}
static int
InvalidMove(int From, int To)
{
if (From >= NPEGS)
return TRUE;
if (From < 0)
return TRUE;
if (To >= NPEGS)
return TRUE;
if (To < 0)
return TRUE;
if (From == To)
return TRUE;
if (!Pegs[From].Count)
return TRUE;
if (Pegs[To].Count &&
Pegs[From].Length[Pegs[From].Count - 1] >
Pegs[To].Length[Pegs[To].Count - 1])
return TRUE;
return FALSE;
}
static void
InitTiles(int NTiles)
{
int Size, SlotNo;
for (Size = NTiles * 2 + 1, SlotNo = 0; Size >= 3; Size -= 2)
Pegs[0].Length[SlotNo++] = Size;
Pegs[0].Count = NTiles;
Pegs[1].Count = 0;
Pegs[2].Count = 0;
}
static void
DisplayTiles(void)
{
int Line, peg, SlotNo;
char TileBuf[BUFSIZ];
erase();
mvaddstr(1, 24, "T O W E R S O F H A N O I");
mvaddstr(3, 34, "SJR 1990");
mvprintw(19, 5, "Moves : %d", NMoves);
attrset(A_REVERSE);
mvaddstr(BASELINE, 8,
" ");
for (Line = TOPLINE; Line < BASELINE; Line++) {
mvaddch(Line, LEFTPEG, ' ');
mvaddch(Line, MIDPEG, ' ');
mvaddch(Line, RIGHTPEG, ' ');
}
mvaddch(BASELINE, LEFTPEG, '1');
mvaddch(BASELINE, MIDPEG, '2');
mvaddch(BASELINE, RIGHTPEG, '3');
attrset(A_NORMAL);
/* Draw tiles */
for (peg = 0; peg < NPEGS; peg++) {
for (SlotNo = 0; SlotNo < Pegs[peg].Count; SlotNo++) {
unsigned len = Pegs[peg].Length[SlotNo];
if (len < sizeof(TileBuf) - 1 && len < (unsigned) PegPos[peg]) {
memset(TileBuf, ' ', len);
TileBuf[len] = '\0';
if (has_colors())
attrset(COLOR_PAIR(LENTOIND(len)));
else
attrset(A_REVERSE);
mvaddstr(BASELINE - (SlotNo + 1),
(int) (PegPos[peg] - len / 2),
TileBuf);
}
}
}
attrset(A_NORMAL);
refresh();
}
static int
GetMove(int *From, int *To)
{
mvaddstr(STATUSLINE, 0, "Next move ('q' to quit) from ");
clrtoeol();
refresh();
if ((*From = getch()) == 'q')
return TRUE;
*From -= ('0' + 1);
addstr(" to ");
clrtoeol();
refresh();
if ((*To = getch()) == 'q')
return TRUE;
*To -= ('0' + 1);
refresh();
if (!AutoFlag)
napms(500);
move(STATUSLINE, 0);
clrtoeol();
refresh();
return FALSE;
}
static void
MakeMove(int From, int To)
{
Pegs[From].Count--;
Pegs[To].Length[Pegs[To].Count] = Pegs[From].Length[Pegs[From].Count];
Pegs[To].Count++;
NMoves++;
DisplayTiles();
}
static void
AutoMove(int From, int To, int Num)
{
if (Num == 1) {
MakeMove(From, To);
napms(500);
return;
}
AutoMove(From, OTHER(From, To), Num - 1);
MakeMove(From, To);
napms(500);
AutoMove(OTHER(From, To), To, Num - 1);
}
static int
Solved(int NumTiles)
{
int i;
for (i = 1; i < NPEGS; i++)
if (Pegs[i].Count == NumTiles)
return TRUE;
return FALSE;
}
static void
Usage(void)
{
fprintf(stderr, "Usage: hanoi [<No Of Tiles>] [a]\n");
fprintf(stderr,
"The 'a' option causes the tower to be solved automatically\n");
}
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