make romdir saving not GP2X specific

not using config as it's binary, this is intended to be user editable.

gp2x/gp2x.c

@@ -244,28 +244,6 @@ u32 wiz_load_gamepak(char *name)
 
 #endif
 
-static int get_romdir(char *buff, size_t size)
-{
-  FILE *f;
-  char *s;
-  int r = -1;
-  
-  f = fopen("romdir.txt", "r");
-  if (f == NULL)
-    return -1;
-
-  s = fgets(buff, size, f);
-  if (s)
-  {
-    r = strlen(s);
-    while (r > 0 && isspace(buff[r-1]))
-      buff[--r] = 0;
-  }
-
-  fclose(f);
-  return r;
-}
-
 void gpsp_plat_init(void)
 {
   char buff[256];
@@ -281,9 +259,6 @@ void gpsp_plat_init(void)
   fb_video_init();
 #endif
 
-  if (get_romdir(buff, sizeof(buff)) > 0)
-    chdir(buff);
-
   gp2x_sound_volume(1);
 }
 
@@ -293,17 +268,6 @@ void gpsp_plat_quit(void)
 
   getcwd(buff1, sizeof(buff1));
   chdir(main_path);
-  if (get_romdir(buff2, sizeof(buff2)) >= 0 &&
-    strcmp(buff1, buff2) != 0)
-  {
-    FILE *f = fopen("romdir.txt", "w");
-    if (f != NULL)
-    {
-      printf("writing romdir: %s\n", buff1);
-      fprintf(f, "%s", buff1);
-      fclose(f);
-    }
-  }
 
   warm_finish();
 #ifdef WIZ_BUILD

main.c

@@ -133,8 +133,8 @@ void trigger_ext_event();
 
 static const char *file_ext[] = { ".gba", ".bin", ".zip", NULL };
 
-#ifdef ARM_ARCH
-void ChangeWorkingDirectory(char *exe)
+#ifdef PSP_BUILD
+static void ChangeWorkingDirectory(char *exe)
 {
 #ifndef _WIN32_WCE
   char *s = strrchr(exe, '/');
@@ -145,6 +145,49 @@ void ChangeWorkingDirectory(char *exe)
   }
 #endif
 }
+
+static void switch_to_romdir(void)
+{
+  char buff[256];
+  int r;
+  
+  file_open(romdir_file, "romdir.txt", read);
+
+  if(file_check_valid(romdir_file))
+  {
+    r = file_read(romdir_file, buff, sizeof(buff) - 1);
+    if (r > 0)
+    {
+      buff[r] = 0;
+      while (r > 0 && isspace(buff[r-1]))
+        buff[--r] = 0;
+      chdir(buff);
+    }
+    file_close(romdir_file);
+  }
+}
+
+static void save_romdir(void)
+{
+  char buff[512];
+  int r = -1;
+
+  snprintf(buff, sizeof(buff), "%s" PATH_SEPARATOR "romdir.txt", main_path);
+  file_open(romdir_file, buff, write);
+
+  if(file_check_valid(romdir_file))
+  {
+    if (getcwd(buff, sizeof(buff)))
+    {
+      file_write(romdir_file, buff, strlen(buff));
+    }
+    file_close(romdir_file);
+  }
+}
+#else
+void ChangeWorkingDirectory(char *exe) {}
+static void switch_to_romdir(void) {}
+static void save_romdir(void) {}
 #endif
 
 void init_main()
@@ -191,10 +234,8 @@ int main(int argc, char *argv[])
 
   // Copy the directory path of the executable into main_path
 
-#ifdef ARM_ARCH
   // ChangeWorkingDirectory will null out the filename out of the path
   ChangeWorkingDirectory(argv[0]);
-#endif
 
   getcwd(main_path, 512);
 
@@ -282,6 +323,7 @@ int main(int argc, char *argv[])
 
   if(argc > 1)
   {
+    switch_to_romdir();
     if(load_gamepak(argv[1]) == -1)
     {
 #ifndef PSP_BUILD
@@ -836,6 +878,8 @@ void synchronize()
 
 void quit()
 {
+  save_romdir();
+
   if(!update_backup_flag)
     update_backup_force();