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Last change
on this file since 3538 was 2, checked in by bird, 23 years ago |
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Initial revision
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Property cvs2svn:cvs-rev
set to
1.1
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Property svn:eol-style
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native
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Property svn:executable
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*
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File size:
473 bytes
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| 1 | /* ffs -- Find the first bit set in the parameter
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| 2 |
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| 3 | @deftypefn Supplemental int ffs (int @var{valu})
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| 4 |
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| 5 | Find the first (least significant) bit set in @var{valu}. Bits are
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| 6 | numbered from right to left, starting with bit 1 (corresponding to the
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| 7 | value 1). If @var{valu} is zero, zero is returned.
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| 8 |
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| 9 | @end deftypefn
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| 10 |
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| 11 | */
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| 12 |
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| 13 | int
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| 14 | ffs (valu)
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| 15 | register int valu;
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| 16 | {
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| 17 | register int bit;
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| 18 |
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| 19 | if (valu == 0)
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| 20 | return 0;
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| 21 |
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| 22 | for (bit = 1; !(valu & 1); bit++)
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| 23 | valu >>= 1;
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| 24 |
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| 25 | return bit;
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| 26 | }
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| 27 |
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