From: Alejandro Colomar <alx@kernel.org>
Date: Wed, 18 Jan 2023 11:38:18 +0000 (+0100)
Subject: Add WIDTHOF() to get the width in bits
X-Git-Tag: 4.14.0-rc1~210
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f90eff4947ffeb7022696ab9861ed3d80bb61d8;p=thirdparty%2Fshadow.git

Add WIDTHOF() to get the width in bits

It is common to use the expression 'sizeof(x) * CHAR_BIT' to mean the
width in bits of a type or object.  Now that there are _WIDTH macros for
some types, indicating the number of bits that they use, it makes sense
to wrap this calculation in a macro of a similar name.

Signed-off-by: Alejandro Colomar <alx@kernel.org>
---

diff --git a/lib/defines.h b/lib/defines.h
index d3416f119..5ef11c021 100644
--- a/lib/defines.h
+++ b/lib/defines.h
@@ -169,6 +169,7 @@ static inline void memzero(void *ptr, size_t size)
 #define SCALE DAY
 #endif
 
+#define WIDTHOF(x)   (sizeof(x) * CHAR_BIT)
 #define NITEMS(arr)  (sizeof((arr)) / sizeof((arr)[0]))
 
 /* Copy string pointed by B to array A with size checking.  It was originally