Change the definition of shemu_printf so that unused parameters are removed from the compiled binary (#111)

* Change the definition of shemu_printf so that unused parameters (strings etc.)  are removed from the compiled binary

* Syntax fix

* Fix the implementation of shemu_internal_printf

* Replace NULL by ND_NULL in the invocation of shemu_internal_printf

Author: junkzours

bdshemu/bdshemu.c

@@ -12,11 +12,11 @@
 
 
 //
-// shemu_printf - simple version
+// shemu_internal_printf - simple version
 //
 #ifndef BDDISASM_NO_FORMAT
 void
-shemu_printf(
+shemu_internal_printf(
     SHEMU_CONTEXT *Context,
     char *formatstring,
     ...
@@ -41,7 +41,7 @@ shemu_printf(
 }
 #else
 void
-shemu_printf(
+shemu_internal_printf(
     SHEMU_CONTEXT *Context,
     char *formatstring,
     ...

bdshemu/include/bdshemu_common.h

@@ -12,6 +12,12 @@
 #endif
 
 
+#ifndef BDDISASM_NO_FORMAT
+#define shemu_printf(Context, formatstring, ...) shemu_internal_printf(Context, formatstring, __VA_ARGS__)
+#else
+#define shemu_printf(Context, formatstring, ...) do { (void)formatstring; shemu_internal_printf(Context, ND_NULL, __VA_ARGS__); } while (0)
+#endif
+
 // The SHELLBMP and STACKBMP are two bitmaps which hold the state of each shellcode byte and each stack byte.
 // Inside SHELLBMP, we store whether a shellcode byte has been fetched for execution or not, and whether it was 
 // modified or not.
@@ -65,7 +71,7 @@
 
 
 void
-shemu_printf(
+shemu_internal_printf(
     SHEMU_CONTEXT *Context,
     char *formatstring,
     ...