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LICENSE

@@ -0,0 +1,11 @@
+DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+Version 2, December 2004
+
+Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
+
+Everyone is permitted to copy and distribute verbatim or modified copies of this license document, and changing it is allowed as long as the name is changed.
+
+DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
+TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You just DO WHAT THE FUCK YOU WANT TO.

sandbox.c

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+#include <stdlib.h>
+#include <errno.h>
+#include <signal.h>
+#include <unistd.h>
+#include <ncurses.h>
+#include <sys/ioctl.h>
+
+enum {
+	COLOR_FONT,
+	COLOR_SAND
+};
+
+enum {
+	ADD,
+	UNDO
+};
+
+struct SAND {
+	int x;
+	int y;
+};
+
+WINDOW *win;
+struct winsize w_size;
+int px = 1, py = 1;
+
+struct SAND *sand_array;
+size_t array_index;
+
+void clear_scr(WINDOW *win) {
+	clear();
+	refresh();
+
+	if (win != NULL) {
+		wclear(win);
+		wrefresh(win);
+	}
+}
+
+void clean_up(int sig) {
+	if (sig == SIGWINCH) {
+		if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w_size) < 0)
+			perror("TIOCGWINSZ");
+
+		if (px >= w_size.ws_col)
+			px = w_size.ws_col - 2;
+
+		if (py >= w_size.ws_row)
+			py = w_size.ws_row - 2;
+
+		endwin();
+		initscr();
+
+		delwin(win);
+		win = newwin(w_size.ws_row, w_size.ws_col, 0, 0);
+	}
+
+	else {
+		clear_scr(win);
+		delwin(win);
+		endwin();
+		if (sand_array != NULL)
+			free(sand_array);
+
+		exit((sig == -1) ? 1 : 0);
+	}
+}
+
+int placed_on(int y, int x) {
+	for (size_t i = 0; i < array_index; i++)
+		if (sand_array[i].y == y && sand_array[i].x == x)
+			return i;
+
+	return -1;
+}
+
+void sand_ctl(char flag) {
+	if (sand_array == NULL) {
+		sand_array = malloc(sizeof(struct SAND));
+		if (sand_array == NULL) {
+			perror("malloc");
+			clean_up(-1);
+		}
+	}
+
+	if (flag == UNDO && array_index > 0) {
+		array_index--;
+		if (array_index == 0) {
+			free(sand_array);
+			sand_array = NULL;
+			return;
+		}
+	}
+
+	else if (flag == ADD) {
+		for (size_t i = 0; i < array_index; i++)
+			if (sand_array[i].x == px && sand_array[i].y == py)
+				return;
+
+		array_index++;
+	}
+
+	struct SAND *tmp = realloc(sand_array, array_index * sizeof(struct SAND));
+	if (tmp == NULL) {
+		perror("realloc");
+		clean_up(-1);
+	}
+
+	if (flag == ADD) {
+		tmp[array_index - 1].x = px;
+		tmp[array_index - 1].y = py;
+	}
+
+	sand_array = tmp;
+}
+
+void move_sand(void) {
+	for (size_t i = 0; i < array_index; i++) {
+		if (placed_on(sand_array[i].y + 1, sand_array[i].x) == -1 && sand_array[i].y < w_size.ws_row - 2)
+			sand_array[i].y++;
+
+		else if (sand_array[i].y < w_size.ws_row - 3) {
+			if (sand_array[i].x + 1 < w_size.ws_col - 1 && placed_on(sand_array[i].y + 1, sand_array[i].x + 1) == -1)
+				sand_array[i].x++;
+
+			else if (sand_array[i].x - 1 > 0 && placed_on(sand_array[i].y + 1, sand_array[i].x - 1) == -1)
+				sand_array[i].x--;
+		}
+	}
+}
+
+void draw(void) {
+	wattron(win, COLOR_PAIR(COLOR_FONT));
+
+	for (size_t y = 1; y < w_size.ws_row - 1; y++)
+		for (size_t x = 1; x < w_size.ws_col - 1; x++)
+			if (!(x % 2))
+				mvwprintw(win, y, x, ".");
+
+	mvwprintw(win, py, px, "+");
+
+	wattroff(win, COLOR_PAIR(COLOR_FONT));
+	wattron(win, COLOR_PAIR(COLOR_SAND));
+
+	for (size_t i = 0; i < array_index; i++)
+		mvwprintw(win, sand_array[i].y, sand_array[i].x, "#");
+
+	wattroff(win, COLOR_PAIR(COLOR_SAND));
+	box(win, 0, 0);
+	wrefresh(win);
+}
+
+int main(void) {
+	signal(SIGINT, clean_up);
+	signal(SIGWINCH, clean_up);
+
+	initscr();
+	noecho();
+	cbreak();
+	curs_set(0);
+	timeout(1000);
+	keypad(stdscr, TRUE);
+
+	if (has_colors() == FALSE) {
+		endwin();
+		fputs("Your terminal does not support color", stderr);
+		exit(1);
+	}
+
+	start_color();
+	init_pair(COLOR_FONT, COLOR_RED, COLOR_BLACK);
+	init_pair(COLOR_SAND, COLOR_YELLOW, COLOR_YELLOW);
+
+	/* Init screen size */
+	clean_up(SIGWINCH);
+	while (1) {
+		clear_scr(win);
+		move_sand();
+		draw();
+
+		int k = getch();
+		if (k == KEY_UP && py - 1 > 0)
+			py--;
+
+		else if (k == KEY_DOWN && py + 1 < w_size.ws_row - 1)
+			py++;
+
+		else if (k == KEY_RIGHT && px + 1 < w_size.ws_col - 1)
+			px++;
+
+		else if (k == KEY_LEFT && px - 1 > 0)
+			px--;
+
+		else if (k == ' ')
+			sand_ctl(ADD);
+
+		else if (k == 'u')
+			sand_ctl(UNDO);
+	}
+}