#include <stdlib.h>
+#include <limits.h>
#include <stdint.h>
#include <ncurses.h>
#include <string.h>
#include "roguelike.h"
#include "keybindings.h"
+uint16_t rrand() {
+// Pseudo-random number generator (LGC algorithm). Use instead of rand() to ensure portable predictability.
+ uint32_t a = 1103515245; // Values for a and b as recommended by POSIX.1-2001 (see man page rand(3)).
+ uint16_t b = 12345;
+ uint32_t mod = 2147483648;
+ static uint32_t seed = 0;
+ seed = ((seed * a) + b) % mod;
+ 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)
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)
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"))