Add player and game loop

RULESET.md

@@ -34,3 +34,11 @@
 ### Wormholes
 
 - When entering a black hole, the player is teleported to a random white hole. If there are no white holes, the player is teleported to a random quadrant.
+
+## Game Loop
+
+- Every turn one player action is read and applied
+
+## Player
+
+- At startup, the player is created at the world centre (`WORLD_WIDTH / 2`, `WORLD_HEIGHT / 2`).

iris_c/Makefile

@@ -6,8 +6,8 @@ TARGET = main
 
 all: $(TARGET)
 
-$(TARGET): main.c random.c random.h world.c world.h prettynames.c prettynames.h
-	$(CC) $(CFLAGS) -o $@ main.c random.c world.c prettynames.c
+$(TARGET): main.c player.c player.h random.c random.h world.c world.h prettynames.c prettynames.h
+	$(CC) $(CFLAGS) -o $@ main.c player.c random.c world.c prettynames.c
 
 clean:
 	rm -f $(TARGET)

iris_c/main.c

@@ -1,14 +1,23 @@
 #include <stdint.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "prettynames.h"
+#include "player.h"
 #include "random.h"
 #include "world.h"
 
 int main() {
     uint32_t seed;
     printf("Enter seed: ");
-    scanf("%u", &seed);
+    if (scanf("%u", &seed) != 1) {
+        printf("Invalid seed.\n");
+        return 1;
+    }
+
+    int ch = 0;
+    while ((ch = getchar()) != '\n' && ch != EOF) {}
+
     set_random_seed(seed);
 
     world_t world;
@@ -33,5 +42,16 @@ int main() {
         centre->is_discovered ? "true" : "false"
     );
 
+    player_t player = player_create(x, y);
+    char action[128];
+    for (;;) {
+        printf(">");
+        fflush(stdout);
+        if (fgets(action, sizeof(action), stdin) == NULL) break;
+
+        action[strcspn(action, "\n")] = '\0';
+        player_process_action(&player, action);
+    }
+
     return 0;
 }

iris_c/player.c

@@ -0,0 +1,12 @@
+#include "player.h"
+
+#include <stddef.h>
+
+player_t player_create(uint16_t x, uint16_t y) {
+    return (player_t){.x = x, .y = y};
+}
+
+void player_process_action(player_t *player, const char *action) {
+    (void)player;
+    (void)action;
+}

iris_c/player.h

@@ -0,0 +1,14 @@
+#ifndef PLAYER_H
+#define PLAYER_H
+
+#include <stdint.h>
+
+typedef struct {
+    uint16_t x;
+    uint16_t y;
+} player_t;
+
+player_t player_create(uint16_t x, uint16_t y);
+void player_process_action(player_t *player, const char *action);
+
+#endif