begin adding options

added the basic framework of how options are loaded.

src/game/opts.c

@@ -0,0 +1,21 @@
+#include "../error.h"
+#include "../util/compat.h"
+#include "paths.h"
+
+/* attempts to load the options,
+   returns 1 upon failure */
+int load_opts(void) {
+    if (!path_opts) return 1;
+    if (!faccess(path_opts, FA_W | FA_R)) {
+        error("attempted to load opts file, but the given path wasn't writable");
+        return 1;
+    }
+
+    // TODO: load opts from the file
+    // the options shall be loaded as key-value-pairs
+    // lines starting with # are seen as comments
+    // the keys are stored on the left size, and the values on the right.
+    // if a field couldn't be parsed the program is not allowed to fail. I'd say we fix the field for the user.
+
+    return 0;
+}

src/game/opts.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <stdint.h>
+
+int load_opts(void);

src/game/paths.c

@@ -6,6 +6,7 @@
 #include "../util/compat.h"
 
 char const* restrict path_dat = NULL;
+char const* restrict path_opts = NULL;
 char const* restrict path_font = NULL;
 char const* restrict path_music = NULL;
 char const* restrict path_place_sfx = NULL;
@@ -52,14 +53,16 @@ int paths_init(void) {
     if (!len) return 1;
 
     // these are explicitly static, as string literals just work like that
-    path_font = init_path("pixeldroid_botic-regular.ttf", len + 28);
+    path_opts = init_path("opts", len + 4); // TODO: shouldn't opts be stored at .config/?
+    path_font = init_path("pixeldroid_botic-regular.ttf", len + 28); // TODO: these three paths should not be stored like opts
     path_music = init_path("korobeiniki.wav", len + 15);
     path_place_sfx = init_path("place.wav", len + 9);
-    return -(!path_font || !path_music || !path_place_sfx);
+    return -(!path_opts || !path_font || !path_music || !path_place_sfx);
 }
 
 void paths_free(void) {
     free((void*)path_dat), path_dat = NULL;
+    free((void*)path_opts), path_opts = NULL;
     free((void*)path_music), path_music = NULL;
     free((void*)path_place_sfx), path_place_sfx = NULL;
 }

src/game/paths.h

@@ -1,6 +1,7 @@
 #pragma once
 
 extern char const* restrict path_dat;
+extern char const* restrict path_opts;
 extern char const* restrict path_font;
 extern char const* restrict path_music;
 extern char const* restrict path_place_sfx;