GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.4 |
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ffsll(3) |
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ffs − find first bit set in a word
#include <strings.h>
int ffs(int i);
#define
_GNU_SOURCE
#include <string.h>
int ffsl(long int i);
int ffsll(long long int i);
The ffs() function returns the position of the first (least significant) bit set in the word i. The least significant bit is position 1 and the most significant position e.g. 32 or 64. The functions ffsll() and ffsl() do the same but take arguments of possibly different size.
These functions return the position of the first bit set, or 0 if no bits are set in i.
4.3BSD, POSIX.1-2001.
BSD systems have a prototype in <string.h>.
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ffsll(3) | |