add assert support to pokeemerald.

include/assert.h

@@ -0,0 +1,43 @@
+#ifndef GUARD_GBASDKASSERT_H
+#define GUARD_GBASDKASSERT_H
+
+// this header is based on the
+// GBA SDK IsAgbAssert.h.
+
+#ifdef NOAGBPRN
+    #define AGBPrintInit()
+    #define AGBPutc(pBuf)
+    #define AGBPrint(pBuf)
+    #define AGBPrintf(...)
+    #define AGBPrintFlush1Block()
+    #define AGBPrintFlush()
+    #define AGBAssert(pFile, nLine, pExpression, nStopProgram)
+#else
+    // without NOAGBPRN defined, this enables asserts for usage
+    // on a standard GBA debugger unit or in emulators that
+    // support it.
+
+    void AGBPrintInit(void);
+    void AGBPutc(const char pBuf);
+    void AGBPrint(const char *pBuf);
+    void AGBPrintf(const char *pBuf, ...);
+    void AGBPrintFlush1Block(void);
+    void AGBPrintFlush(void);
+    void AGBAssert(const char *pFile, int nLine, const char *pExpression, int nStopProgram);
+#endif
+
+// when using AGB_WARNING, be sure to flush after as AGBAssert does not flush the string to console
+// immediately after usage.
+#ifdef NOAGBPRN
+    #define AGB_ASSERT(expression)
+#else
+    #define AGB_ASSERT(expression)  (expression) ? ((void *)0) : AGBAssert(__FILE__, __LINE__, #expression, 1);
+#endif
+
+#ifdef NOAGBPRN
+    #define AGB_WARNING(expression)
+#else
+    #define AGB_WARNING(expression) (expression) ? ((void *)0) : AGBAssert(__FILE__, __LINE__, #expression, 0);
+#endif
+
+#endif