From 3c701f1d61b33a5ffaddd4199ac277da8e287f30 Mon Sep 17 00:00:00 2001
From: José Fonseca <jfonseca@vmware.com>
Date: Tue, 1 Feb 2011 10:41:46 +0000
Subject: glsl: Fix printf_length() on MSVC.

---
 src/glsl/ralloc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/glsl/ralloc.c b/src/glsl/ralloc.c
index fa2dd8b01e6..3ba5d86cd9c 100644
--- a/src/glsl/ralloc.c
+++ b/src/glsl/ralloc.c
@@ -392,7 +392,15 @@ printf_length(const char *fmt, va_list untouched_args)
    va_list args;
    va_copy(args, untouched_args);
 
+#ifdef _MSC_VER
+   /* We need to use _vcsprintf to calculate the size as vsnprintf returns -1
+    * if the number of characters to write is greater than count.
+    */
+   size = _vscprintf(fmt, args);
+   (void)junk;
+#else
    size = vsnprintf(&junk, 1, fmt, args);
+#endif
    assert(size >= 0);
 
    return size;
-- 
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