summaryrefslogtreecommitdiffstats
path: root/lib/bitops.h
blob: 1b6dc68ef079c106491a809fffb67008e1ecadb9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
/*
 *	BIRD Library -- Generic Bit Operations
 *
 *	(c) 1998 Martin Mares <mj@ucw.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

/*
 *	Bit mask operations:
 *
 *	u32_mkmask	Make bit mask consisting of <n> consecutive ones
 *			from the left and the rest filled with zeroes.
 *			E.g., u32_mkmask(5) = 0xf8000000.
 *	u32_masklen	Inverse operation to u32_mkmask, -1 if not a bitmask.
 */

u32 u32_mkmask(unsigned n);
int u32_masklen(u32 x);