[3/5] ntdll: Allow passing NULL buffer to printf functions

[Sebastian Lackner]

The windows version allows passing a NULL pointer instead of a buffer to
count the required length without any output.

---
 dlls/ntdll/printf.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

-------------- next part --------------
From 8a04824ff79e4ea242c965c876dcee4ceb415c6f Mon Sep 17 00:00:00 2001
From: Sebastian Lackner <sebastian at fds-team.de>
Date: Fri, 20 Dec 2013 05:56:40 +0100
Subject: ntdll: Allow passing NULL buffer to printf functions

---
 dlls/ntdll/printf.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/dlls/ntdll/printf.c b/dlls/ntdll/printf.c
index 3a5067a..6c904cc 100644
--- a/dlls/ntdll/printf.c
+++ b/dlls/ntdll/printf.c
@@ -47,6 +47,7 @@ typedef struct pf_output_t
     int len;
     BOOL unicode;
     union {
+        void  *X;
         LPWSTR W;
         LPSTR  A;
     } buf;
@@ -72,7 +73,12 @@ static inline int pf_output_stringW( pf_output *out, LPCWSTR str, int len )
 
     if( len < 0 )
         len = strlenW( str );
-    if( out->unicode )
+    if (!out->buf.X)
+    {
+        out->used += len;
+        return len;
+    }
+    else if (out->unicode)
     {
         LPWSTR p = out->buf.W + out->used;
 
@@ -110,7 +116,12 @@ static inline int pf_output_stringA( pf_output *out, LPCSTR str, int len )
 
     if( len < 0 )
         len = strlen( str );
-    if( !out->unicode )
+    if (!out->buf.X)
+    {
+        out->used += len;
+        return len;
+    }
+    else if (!out->unicode)
     {
         LPSTR p = out->buf.A + out->used;
 
-- 
1.7.9.5