From 939d2bf46ca1a5b9f80410f0be2bfd6d4bf84647 Mon Sep 17 00:00:00 2001
From: Mark Riddoch <Mark.Riddoch@SkySQL.com>
Date: Sat, 15 Jun 2013 12:12:21 +0100
Subject: [PATCH] Addition of a version of printf that can print to a DCB

---
 core/dcb.c    | 24 ++++++++++++++++++++++++
 include/dcb.h |  1 +
 2 files changed, 25 insertions(+)

diff --git a/core/dcb.c b/core/dcb.c
index 95d5c8a0c..8f5c3f847 100644
--- a/core/dcb.c
+++ b/core/dcb.c
@@ -26,6 +26,7 @@
  *
  */
 #include <stdio.h>
+#include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 #include <dcb.h>
@@ -216,3 +217,26 @@ gw_dcb_state2string (int state) {
 			return "DCB (unknown)";
 	}
 }
+
+/*
+ * A  DCB based wrapper for printf. Allows formattign printing to
+ * a descritor control block.
+ *
+ * @param dcb	Descriptor to write to
+ * @param fmt	A printf format string
+ * @param ...	Variable arguments for the print format
+ */
+void
+dcb_printf(DCB *dcb, const char *fmt, ...)
+{
+GWBUF	*buf;
+va_list	args;
+
+	if ((buf = gwbuf_alloc(10240)) == NULL)
+		return;
+	va_start(args, fmt);
+	vsnprintf(GWBUF_DATA(buf), 10240, fmt, args);
+	va_end(args);
+
+	dcb->func.write(dcb, buf);
+}
diff --git a/include/dcb.h b/include/dcb.h
index 13efaee5f..b734177ee 100644
--- a/include/dcb.h
+++ b/include/dcb.h
@@ -106,5 +106,6 @@ extern DCB		*connect_dcb(struct server *, struct session *, const char *);
 extern void		printAllDCBs();			/* Debug to print all DCB in the system */
 extern void		printDCB(DCB *);		/* Debug print routine */
 extern const char 	*gw_dcb_state2string(int);	/* DCB state to string */
+extern void		dcb_printf(DCB *, const char *, ...);	/* DCB version of printf */
 
 #endif