From 4bc33d64de9bb2c1cd96240337ba8486300759da Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Thu, 1 Jun 2017 16:16:34 -0300
Subject: avoid overflows in computation of step size

---
 llimits.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'llimits.h')

diff --git a/llimits.h b/llimits.h
index 14940550..909aba3b 100644
--- a/llimits.h
+++ b/llimits.h
@@ -1,5 +1,5 @@
 /*
-** $Id: llimits.h,v 1.141 2015/11/19 19:16:22 roberto Exp roberto $
+** $Id: llimits.h,v 1.142 2017/04/24 18:06:12 roberto Exp roberto $
 ** Limits, basic types, and some other 'installation-dependent' definitions
 ** See Copyright Notice in lua.h
 */
@@ -51,6 +51,13 @@ typedef unsigned char lu_byte;
 #define MAX_INT		INT_MAX  /* maximum value of an int */
 
 
+/*
+** floor of the log2 of the maximum signed value for integral type 't'.
+** (That is, maximum 'n' such that '2^n' fits in the given signed type.)
+*/
+#define log2maxs(t)	(sizeof(t) * 8 - 2)
+
+
 /*
 ** conversion of pointer to unsigned integer:
 ** this is for hashing only; there is no problem if the integer
-- 
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