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#define _XOPEN_SOURCE 700
#include <ctype.h>
#include <curses.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define CTRL_C 3
#define COLUMNNAMES "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#define MINSIZE 6
#define DEFSIZE 20
#define MAXSIZE ((int)sizeof(COLUMNNAMES) - 1)
enum { VERTICAL, HORIZONTAL };
static struct ship {
char *name;
int len;
int nhits;
} ships[] = {
{ "Patrol Boat", 2, 0 },
{ "Submarine", 2, 0 },
{ "Cruiser", 3, 0 },
{ "Destroyer", 3, 0 },
{ "Battleship", 4, 0 },
{ "Aircraft Carrier", 5, 0 },
};
static void usage(const char *progname, int status)
{
printf("usage: %s [-h] [SIZE]\n", progname);
exit(status);
}
static void updatescreen(const char *board, int width, int height, char *input)
{
clear();
move(0, 0);
printw(" ");
for (int i = 0; i < width; i++) {
printw("%c", COLUMNNAMES[i]);
}
printw("\n");
for (int i = 0; i < height; i++) {
printw("%2d ", i + 1);
for (int j = 0; j < width; j++) {
printw("%c", board[i * width + j]);
}
printw("\n");
}
printw("\nMove: %s", input);
refresh();
}
static int place_ship(struct ship *s, char *board, int width, int height, int loc, int direction)
{
int step = direction == HORIZONTAL ? 1 : width;
if (loc + s->len * step > width * height) {
return 0;
}
if (direction == HORIZONTAL && (loc + s->len) % width < loc % width) {
return 0;
}
for (int i = 0; i < s->len; i++) {
if (board[loc + i * step] != '.') {
return 0;
}
}
for (int i = 0; i < s->len; i++) {
board[loc + i * step] = s->name[0];
}
return 1;
}
static char *setup_board(int size)
{
int width = size;
int height = size;
size *= size;
char *board = malloc(size);
if (!board) {
return NULL;
}
memset(board, '.', size);
for (size_t i = 0; i < sizeof(ships) / sizeof(ships[0]); i++) {
int loc = 0;
do {
loc = rand() % (size);
} while (place_ship(ships + i, board, width, height, loc, rand() & 1) != 1);
}
return board;
}
static void fire(char *board, int size, const char *input)
{
clear();
move(0, 0);
printw("firing at %s\n", input);
char cnames[] = COLUMNNAMES;
char *columnname = strchr(cnames, toupper(input[0]));
if (!columnname) {
printw("invalid column\n");
return;
}
int col = columnname - cnames;
if (col < 0 || col > size) {
printw("column %d out of range\n", col);
return;
}
int row = atoi(input + 1) - 1;
if (row < 0 || row > size) {
printw("row %d out of range\n", row);
return;
}
printw("row %d, column %d\n", row, col);
board[row * size + col] = '!';
}
int main(int argc, char *argv[])
{
int size = DEFSIZE;
int c;
while ((c = getopt(argc, argv, "h")) != -1) {
switch (c) {
case 'h':
usage(argv[0], 0);
break;
default:
usage(argv[0], 1);
}
}
if (optind == argc - 1) {
size = atoi(argv[optind]);
} else if (optind < argc) {
usage(argv[0], 1);
}
if (size < MINSIZE || size > MAXSIZE) {
printf("size must be between %d and %d\n", MINSIZE, MAXSIZE);
return 1;
}
srand(time(NULL));
char *board1 = setup_board(size);
initscr();
keypad(stdscr, true);
noecho();
raw();
char inbuf[BUFSIZ] = {0};
char *input = inbuf;
updatescreen(board1, size, size, inbuf);
while ((c = getch()) != 0) {
switch (c) {
case '\n':
fire(board1, size, inbuf);
refresh();
input = inbuf;
*input = '\0';
break;
case KEY_BACKSPACE:
if (input != inbuf) {
input--;
*input = '\0';
}
break;
case KEY_BREAK:
case CTRL_C:
endwin();
exit(0);
break;
default:
*input++ = c;
*input = '\0';
}
updatescreen(board1, size, size, inbuf);
}
endwin();
return 0;
}
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