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make overflow test on delta base offset work regardless of variable size

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This patch introduces the MSB() macro to obtain the desired number of
most significant bits from a given variable independently of the variable
type.

It is then used to better implement the overflow test on the OBJ_OFS_DELTA
base offset variable with the property of always working correctly
regardless of the type/size of that variable.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Nicolas Pitre
2007-04-09 01:06:29 -04:00
committed by Junio C Hamano
parent 57059091fa
commit 8723f21626
5 changed files with 12 additions and 4 deletions
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8
git-compat-util.h
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@ -13,6 +13,14 @@
#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
#ifdef __GNUC__
#define TYPEOF(x) (__typeof__(x))
#else
#define TYPEOF(x)
#endif
#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
#if !defined(__APPLE__) && !defined(__FreeBSD__)
#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */