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NetBSD 6.1.5 - man page for fls32 (netbsd section 3)

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FFS32(3)			   BSD Library Functions Manual 			 FFS32(3)

NAME
     ffs32, ffs64, fls32, fls64 -- find first or last bit set

SYNOPSIS
     #include <sys/bitops.h>

     int
     ffs32(uint32_t n);

     int
     ffs64(uint64_t n);

     int
     fls32(uint32_t n);

     int
     fls64(uint64_t n);

DESCRIPTION
     The ffs32() and ffs64() functions find the first bit set in n and return the index of that
     bit.  Conversely, the fls32() and fls64() functions find the last bit set in n, returning
     the index of the bit.

     The search always starts from the bit 1 (the least significant bit).  If the argument n is
     zero, each function returns zero.

IMPLEMENTATION NOTES
     The described functions are implemented as static inline functions in the <sys/bitops.h>
     header.  The standard C library includes a more portable ffs(3) for user applications.

EXAMPLES
     In the following example f = 3 and l = 7:

	   uint32_t n = 0x44;	   /* 01000100 */
	   int f, l;

	   f = ffs32(n);
	   l = fls32(n);

SEE ALSO
     bitops(3), bits(3), bitstring(3), ffs(3), setbit(9)

HISTORY
     These functions first appeared in NetBSD 5.0.

BSD					  April 8, 2011 				      BSD
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