(Untested) Implement cheats

src/cheat.c

@@ -302,6 +302,29 @@ void FCEU_FlushGameCheats(FILE *override, int nosave) {
 	RebuildSubCheats();	/* Remove memory handlers. */
 }
 
+void FCEU_ResetCheats(void)
+{
+	if (CheatComp) {
+		free(CheatComp);
+		CheatComp = 0;
+	}
+
+   if (cheats)
+   {
+      struct CHEATF *next = cheats;
+      for (;; ) {
+         struct CHEATF *last = next;
+         next = next->next;
+         free(last->name);
+         free(last);
+         if (!next) break;
+      }
+      cheats = cheatsl = 0;
+   }
+
+	RebuildSubCheats();	/* Remove memory handlers. */
+}
+
 
 int FCEUI_AddCheat(const char *name, uint32 addr, uint8 val, int compare, int type) {
 	char *t;

src/cheat.h

@@ -9,4 +9,6 @@ void FCEU_FlushGameCheats(FILE *override, int nosave);
 void FCEU_ApplyPeriodicCheats(void);
 void FCEU_PowerCheats(void);
 
+void FCEU_ResetCheats(void);
+
 #endif

src/drivers/libretro/libretro.c

@@ -797,10 +797,33 @@ bool retro_unserialize(const void * data, size_t size)
 }
 
 void retro_cheat_reset(void)
-{}
+{
+   FCEU_ResetCheats();
+}
 
-void retro_cheat_set(unsigned a, bool b, const char* c)
-{ }
+void retro_cheat_set(unsigned index, bool enabled, const char *code)
+{
+   char name[256];
+   sprintf(name, "N/A");
+   uint16 a;
+   uint8  v;
+   int    c;
+   int    type = 1;
+
+   if (FCEUI_DecodeGG(code, &a, &v, &c))
+      goto input_cheat;
+
+   /* Not a Game Genie code. */
+
+   if (FCEUI_DecodePAR(code, &a, &v, &c, &type))
+      goto input_cheat;
+
+   /* Not a Pro Action Replay code. */
+
+   return;
+input_cheat:
+   FCEUI_AddCheat(name, a, v, c, type);
+}
 
 bool retro_load_game(const struct retro_game_info *game)
 {