Adding libugba interrupt handler

examples/_lib/libugba/include/debug.h

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: MIT
+//
+// Copyright (c) 2020-2021 Antonio Niño Díaz
+
+#ifndef DEBUG_H__
+#define DEBUG_H__
+
+// This file has debug utilities that don't work on GBA binaries. However, there
+// are defines here that remove them automatically so that code that uses them
+// can still build without errors.
+
+#include <stdint.h>
+
+#include "definitions.h"
+
+// Take a screenshot. If the specified name is NULL, it defaults to
+// "screenshot.png".
+#ifdef __GBA__
+#define Debug_Screenshot(n)  do { (void)(n); } while (0)
+#else
+EXPORT_API void Debug_Screenshot(const char *name);
+#endif
+
+// Custom assert() that works on GBA and PC.
+#ifndef UGBA_DEBUG
+# define UGBA_Assert(expr) ((void)0)
+#else
+# define UGBA_Assert(expr) \
+        ((expr) ? (void)0 : \
+                  UGBA_AssertFunction(__FILE__, __LINE__, __func__, #expr))
+#endif // UGBA_DEBUG
+
+EXPORT_API void UGBA_AssertFunction(const char *file, int line,
+                                    const char *func, const char *expr);
+#endif // DEBUG_H__