refactoring fixes

runtime/io/vx_io.c

@@ -0,0 +1,38 @@
+
+#include "vx_io.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void vx_print_hex(unsigned f)
+{
+	// vx_print_str(hextoa[f]);
+	if (f < 16)
+	{
+		vx_print_str(hextoa[f]);
+		return;
+	}
+	int temp;
+	int sf = 32;
+	bool start = false;
+	do
+	{
+		temp = (f >> (sf - 4)) & 0xf;
+		if (temp != 0) start = true;
+		if (start) vx_print_str(hextoa[temp]);
+		sf -= 4;
+	} while(sf > 0);
+}
+
+
+void vx_printf(const char * c, unsigned f)
+{
+	vx_print_str(c);
+	vx_print_hex(f);
+	vx_print_str("\n");
+}
+
+#ifdef __cplusplus
+}
+#endif