From 8a4dfb917f12b4e3ef36d135081379927c1ca1db Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Sun, 7 Sep 2008 21:46:45 -0700
Subject: xcb_mask must not be zero when n == 32.

left shift of a 32-bit value by 32 is undefined, don't try to use it.
---
 aux/xcb_bitops.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/aux/xcb_bitops.h b/aux/xcb_bitops.h
index 48c3401..a6872a1 100644
--- a/aux/xcb_bitops.h
+++ b/aux/xcb_bitops.h
@@ -51,7 +51,7 @@
 _X_INLINE static uint32_t
 xcb_mask(uint32_t n)
 {
-    return (1 << n) - 1;
+    return n == 32 ? ~0 : (1 << n) - 1;
 }
 
 
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