diff --git a/ase/awk/Awk.cpp b/ase/awk/Awk.cpp
index f22d42a8..efc61780 100644
--- a/ase/awk/Awk.cpp
+++ b/ase/awk/Awk.cpp
@@ -1,5 +1,5 @@
 /*
- * $Id: Awk.cpp,v 1.5 2007/05/03 15:14:02 bacon Exp $
+ * $Id: Awk.cpp,v 1.6 2007/05/04 10:25:14 bacon Exp $
  */
 
 #include <ase/awk/Awk.hpp>
@@ -64,6 +64,11 @@ namespace ASE
 		prmfns.ccls.to_lower    = toLower;
 		prmfns.ccls.custom_data = this;
 
+		/*
+		int (Awk::*ptr) (void*, ase_char_t*, ase_size_t, const ase_char_t*, ...) = &Awk::sprintf;
+		(this->*ptr) (ASE_NULL, ASE_NULL, 0, ASE_NULL);
+		*/
+
 		prmfns.misc.pow         = pow;
 		prmfns.misc.sprintf     = sprintf;
 		prmfns.misc.dprintf     = dprintf;
@@ -218,11 +223,19 @@ namespace ASE
 	int Awk::sprintf (void* custom, char_t* buf, size_t size,
 	                  const char_t* fmt, ...)
 	{
-		return 0;
+		va_list ap;
+		va_start (ap, fmt);
+		int n = ((Awk*)custom)->vsprintf (buf, size, fmt, ap);
+		va_end (ap);
+		return n;
 	}
 
 	void Awk::dprintf (void* custom, const char_t* fmt, ...)
 	{
+		va_list ap;
+		va_start (ap, fmt);
+		((Awk*)custom)->vdprintf (fmt, ap);
+		va_end (ap);
 	}
 
 }
diff --git a/ase/awk/Awk.hpp b/ase/awk/Awk.hpp
index 61e35f1a..02429dd6 100644
--- a/ase/awk/Awk.hpp
+++ b/ase/awk/Awk.hpp
@@ -1,11 +1,12 @@
 /*
- * $Id: Awk.hpp,v 1.4 2007/05/03 15:14:02 bacon Exp $
+ * $Id: Awk.hpp,v 1.5 2007/05/04 10:25:14 bacon Exp $
  */
 
 #ifndef _ASE_AWK_AWK_HPP_
 #define _ASE_AWK_AWK_HPP_
 
 #include <ase/awk/awk.h>
+#include <stdarg.h>
 
 namespace ASE
 {
@@ -60,6 +61,9 @@ namespace ASE
 		virtual cint_t toLower  (cint_t c) = 0;
 
 		virtual real_t pow (real_t x, real_t y) = 0;
+		virtual int    vsprintf (char_t* buf, size_t size,
+		                         const char_t* fmt, va_list arg) = 0;
+		virtual void   vdprintf (const char_t* fmt, va_list arg) = 0;
 
 		static ssize_t sourceReader (
         		int cmd, void* arg, char_t* data, size_t count);