[cwittich] 64056: [crt] fix behavior of _sxprintf when a NULL buffer is supplied fixes ntdll:string winetest

Author: cwittich
Date: Sun Sep  7 10:34:17 2014
New Revision: 64056

URL: http://svn.reactos.org/svn/reactos?rev=64056&view=rev
Log:
[crt]
fix behavior of _sxprintf when a NULL buffer is supplied
fixes ntdll:string winetest

Modified:
    trunk/reactos/lib/sdk/crt/printf/_sxprintf.c
    trunk/reactos/lib/sdk/crt/printf/streamout.c

Modified: trunk/reactos/lib/sdk/crt/printf/_sxprintf.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/sdk/crt/printf/_sxprint...
==============================================================================
--- trunk/reactos/lib/sdk/crt/printf/_sxprintf.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/sdk/crt/printf/_sxprintf.c	[iso-8859-1] Sun Sep  7 10:34:17 2014
@@ -57,12 +57,6 @@
     int result;
     FILE stream;

-    /* Check trivial case */
-    if ((buffer == NULL) && (count == 0) && (sizeOfBuffer == 0))
-    {
-        return 0;
-    }
-
 #if IS_SECAPI
     /* Validate parameters */
     if (MSVCRT_CHECK_PMT(((buffer == NULL) || (format == NULL) || (sizeOfBuffer <= 0))))
@@ -118,7 +112,8 @@
     buffer[result] = _T('\0');
 #else
     /* Only zero terminate if there is enough space left */
-    if (stream._cnt >= sizeof(TCHAR)) *(TCHAR*)stream._ptr = _T('\0');
+    if ((stream._cnt >= sizeof(TCHAR)) && (stream._ptr))
+        *(TCHAR*)stream._ptr = _T('\0');
 #endif

return result;

Modified: trunk/reactos/lib/sdk/crt/printf/streamout.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/sdk/crt/printf/streamou...
==============================================================================
--- trunk/reactos/lib/sdk/crt/printf/streamout.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/sdk/crt/printf/streamout.c	[iso-8859-1] Sun Sep  7 10:34:17 2014
@@ -227,6 +227,9 @@
 int
 streamout_char(FILE *stream, int chr)
 {
+    if ((stream->_flag & _IOSTRG) && (!stream->_ptr))
+        return 1;
+
 #if defined(_USER32_WSPRINTF) || defined(_LIBCNT_)
     /* Check if the buffer is full */
     if (stream->_cnt < sizeof(TCHAR))