Don't save and load maps, save and load seeds of maps. Load via command line option.

[plomrogue] / roguelike.c

diff --git a/roguelike.c b/roguelike.c
index 20181befccf6b2de2c62d2a74091c4463cd50e2e..7abc32337e876e671993e29c6924c3b0db29f218 100644 (file)
--- a/roguelike.c
+++ b/roguelike.c
@@ -1,11 +1,50 @@
+#include <stdlib.h>
+//#include <limits.h>
+#include <stdint.h>
 #include <ncurses.h>
 #include <string.h>
-#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
 #include "windows.h"
 #include "draw_wins.h"
 #include "roguelike.h"
 #include "keybindings.h"
 
+uint16_t rrand(char use_seed, uint32_t new_seed) {
+// Pseudo-random number generator (LGC algorithm). Use instead of rand() to ensure portable predictability.
+  static uint32_t seed = 0;
+  if (0 != use_seed)
+    seed = new_seed;
+  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).
+
+uint32_t load_seed() {
+// Load seed integer from seed file.
+  uint32_t seed;
+  const uint16_t nchar = 256;
+  FILE * file = fopen("seed", "r");
+  unsigned char a = fgetc(file);
+  unsigned char b = fgetc(file);
+  unsigned char c = fgetc(file);
+  unsigned char d = fgetc(file);
+  seed = (a * nchar * nchar * nchar) + (b * nchar * nchar) + (c * nchar) + d;
+  fclose(file);
+  return seed; }
+
+void save_seed(uint32_t seed) {
+// Save seed integer to seed file.
+  const uint16_t nchar = 256;
+  unsigned char a = seed / (nchar * nchar * nchar);
+  unsigned char b = (seed - (a * nchar * nchar * nchar)) / (nchar * nchar);
+  unsigned char c = (seed - ((a * nchar * nchar * nchar) + (b * nchar * nchar))) / nchar;
+  unsigned char d = seed % nchar;
+  FILE * file = fopen("seed", "w");
+  fputc(a, file);
+  fputc(b, file);
+  fputc(c, file);
+  fputc(d, file);
+  fclose(file); }
+
 void toggle_window (struct WinMeta * win_meta, struct Win * win) {
 // Toggle display of window win.
   if (0 != win->curses)
@@ -16,8 +55,8 @@ void toggle_window (struct WinMeta * win_meta, struct Win * win) {
 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 == '+')
@@ -28,20 +67,21 @@ void growshrink_active_window (struct WinMeta * win_meta, char change) {
       width++;
     resize_active_window (win_meta, height, width); } }
 
-struct Map init_map () {
+struct Map init_map (uint32_t seed) {
 // Initialize map with some experimental start values.
+  rrand(1, seed);
   struct Map map;
   map.width = 96;
   map.height = 32;
   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(0, 0);
       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)
@@ -64,7 +104,7 @@ void map_scroll (struct Map * map, char dir) {
 void next_turn (struct World * world) {
 // Increment turn and move enemy.
   world->turn++;
-  char d = rand() % 5;
+  char d = rrand(0, 0) % 5;
   char ty = world->monster->y;
   char tx = world->monster->x;
   if (1 == d)
@@ -84,16 +124,16 @@ void next_turn (struct World * world) {
 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)
@@ -142,18 +182,28 @@ void move_player (struct World * world, char 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."); }
 
-int main () {
+int main (int argc, char *argv[]) {
+  uint32_t seed = time(NULL);
+  int opt;
+  while ((opt = getopt(argc, argv, "l")) != -1) {
+    switch (opt) {
+      case 'l':
+       seed = load_seed();
+        break;
+      default:
+        exit(EXIT_FAILURE); } }
+
   struct World world;
   init_keybindings(&world);
   world.turn = 0;
   world.log = calloc(1, sizeof(char));
   update_log (&world, "Start!");
-  struct Map map = init_map();
+  struct Map map = init_map(seed);
   world.map = &map;
   struct Player player;
   player.y = 16;
@@ -217,6 +267,8 @@ int main () {
       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, "save seed"))
+      save_seed(seed);
     else if (key == get_action_key(world.keybindings, "map up"))
       map_scroll (&map, 'n');
     else if (key == get_action_key(world.keybindings, "map down"))