|
Last change
on this file was 607, checked in by bird, 22 years ago |
|
Initial revision
|
-
Property cvs2svn:cvs-rev
set to
1.1
-
Property svn:eol-style
set to
native
-
Property svn:executable
set to
*
|
|
File size:
473 bytes
|
| Line | |
|---|
| 1 | /* ffs -- Find the first bit set in the parameter
|
|---|
| 2 |
|
|---|
| 3 | @deftypefn Supplemental int ffs (int @var{valu})
|
|---|
| 4 |
|
|---|
| 5 | Find the first (least significant) bit set in @var{valu}. Bits are
|
|---|
| 6 | numbered from right to left, starting with bit 1 (corresponding to the
|
|---|
| 7 | value 1). If @var{valu} is zero, zero is returned.
|
|---|
| 8 |
|
|---|
| 9 | @end deftypefn
|
|---|
| 10 |
|
|---|
| 11 | */
|
|---|
| 12 |
|
|---|
| 13 | int
|
|---|
| 14 | ffs (valu)
|
|---|
| 15 | register int valu;
|
|---|
| 16 | {
|
|---|
| 17 | register int bit;
|
|---|
| 18 |
|
|---|
| 19 | if (valu == 0)
|
|---|
| 20 | return 0;
|
|---|
| 21 |
|
|---|
| 22 | for (bit = 1; !(valu & 1); bit++)
|
|---|
| 23 | valu >>= 1;
|
|---|
| 24 |
|
|---|
| 25 | return bit;
|
|---|
| 26 | }
|
|---|
| 27 |
|
|---|
Note:
See
TracBrowser
for help on using the repository browser.
