+#include <stdlib.h>
+#include <limits.h>
+#include <stdint.h>
#include <ncurses.h>
#include <string.h>
-#include <stdlib.h>
#include "windows.h"
#include "draw_wins.h"
#include "roguelike.h"
#include "keybindings.h"
+uint16_t rrand() {
+// Pseudo-random number generator (LGC algorithm). Use instead of rand() to ensure portable predictability.
+ static uint32_t seed = 0;
+ seed = ((seed * 1103515245) + 12345) % 2147483648; // Values as recommended by POSIX.1-2001 (see rand(3)).
+ return (seed / 65536); } // Ignore least significant 16 bits (they are less random).
+
void toggle_window (struct WinMeta * win_meta, struct Win * win) {
// Toggle display of window win.
if (0 != win->curses)
void growshrink_active_window (struct WinMeta * win_meta, char change) {
// Grow or shrink active window horizontally or vertically by one cell size.
if (0 != win_meta->active) {
- int height = win_meta->active->height;
- int width = win_meta->active->width;
+ uint16_t height = win_meta->active->height;
+ uint16_t width = win_meta->active->width;
if (change == '-')
height--;
else if (change == '+')
map.offset_x = 0;
map.offset_y = 0;
map.cells = malloc(map.width * map.height);
- int x, y, ran;
+ uint16_t x, y, ran;
char terrain;
for (y = 0; y < map.height; y++)
for (x = 0; x < map.width; x++) {
terrain = '.';
- ran = rand();
+ ran = rrand();
if ( 0 == ran % ((x*x) / 3 + 1)
|| 0 == ran % ((y*y) / 3 + 1)
|| 0 == ran % ((map.width - x - 1) * (map.width - x - 1) / 3 + 1)
void next_turn (struct World * world) {
// Increment turn and move enemy.
world->turn++;
- char d = rand() % 5;
+ char d = rrand() % 5;
char ty = world->monster->y;
char tx = world->monster->x;
if (1 == d)
void update_log (struct World * world, char * text) {
// Update log with new text to be appended.
char * new_text;
- int len_old = strlen(world->log);
- int len_new = strlen(text);
- int len_whole = len_old + len_new + 1;
+ uint16_t len_old = strlen(world->log);
+ uint16_t len_new = strlen(text);
+ uint16_t len_whole = len_old + len_new + 1;
new_text = calloc(len_whole, sizeof(char));
memcpy(new_text, world->log, len_old);
memcpy(new_text + len_old, text, len_new);
free(world->log);
world->log = new_text; }
-char is_passable (struct World * world, int x, int y) {
+char is_passable (struct World * world, uint16_t x, uint16_t y) {
// Check if coordinate on (or beyond) map is accessible to movement.
char passable = 0;
if (0 <= x && x < world->map->width && 0 <= y && y < world->map->height)
prev = success * d;
next_turn (world); }
-void player_wait(struct World * world) {
+void player_wait (struct World * world) {
// Make player wait one turn.
next_turn (world);
update_log (world, "\nYou wait."); }
+void save_map (struct Map * map) {
+// Save map to file "map".
+ FILE * file = fopen("map", "w");
+ fputc(map->width / CHAR_MAX, file);
+ fputc(map->width % CHAR_MAX, file);
+ uint16_t y, x;
+ for (y = 0; y < map->height; y++)
+ for (x = 0; x < map->width; x++)
+ fputc(map->cells[y * map->width + x], file);
+ fclose(file); }
+
+struct Map load_map () {
+// Load map from file.
+ FILE * file = fopen("map", "r");
+ struct Map map;
+ map.width = (fgetc(file) * CHAR_MAX) + fgetc(file);
+ long pos = ftell(file);
+ int c = fgetc(file);
+ uint32_t i = 0;
+ while (EOF != c) {
+ i++;
+ c = fgetc(file); }
+ map.cells = malloc(i * sizeof(char));
+ map.height = i / map.width;
+ fseek(file, pos, SEEK_SET);
+ c = fgetc(file);
+ i = 0;
+ while (EOF != c) {
+ map.cells[i] = (char) c;
+ c = fgetc(file);
+ i++; }
+ fclose(file);
+ return map; }
+
int main () {
struct World world;
init_keybindings(&world);
keyswin_move_selection (&world, 'd');
else if (key == get_action_key(world.keybindings, "keys mod"))
keyswin_mod_key (&world, &win_meta);
+ else if (key == get_action_key(world.keybindings, "load map"))
+ map = load_map();
+ else if (key == get_action_key(world.keybindings, "save map"))
+ save_map(&map);
else if (key == get_action_key(world.keybindings, "map up"))
map_scroll (&map, 'n');
else if (key == get_action_key(world.keybindings, "map down"))