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729d1ff9d8
* libc/argz/argz_add.c: Change to use _DEFUN macro for function
definition.
* libc/argz/argz_add_sep.c: Ditto.
* libc/argz/argz_append.c libc/argz/argz_count.c: Ditto.
* libc/argz/argz_create.c libc/argz/argz_create_sep.c: Ditto.
* libc/argz/argz_delete.c libc/argz/argz_extract.c: Ditto.
* libc/argz/argz_insert.c libc/argz/argz_next.c: Ditto.
* libc/argz/argz_replace.c libc/argz/argz_stringify.c: Ditto.
* libc/argz/envz_add.c libc/argz/envz_entry.c: Ditto.
* libc/argz/envz_get.c libc/argz/envz_merge.c: Ditto.
* libc/argz/envz_remove.c libc/argz/envz_strip.c: Ditto.
* libc/locale/nl_langinfo.c libc/misc/ffs.c: Ditto.
* libc/posix/closedir.c libc/posix/creat.c: Ditto.
* libc/posix/execl.c libc/posix/execle.c: Ditto.
* libc/posix/execlp.c libc/posix/execve.c: Ditto.
* libc/posix/isatty.c libc/posix/opendir.c: Ditto.
* libc/posix/popen.c libc/posix/readdir.c: Ditto.
* libc/posix/readdir_r.c libc/posix/rewinddir.c: Ditto.
* libc/posix/scandir.c libc/posix/seekdir.c: Ditto.
* libc/posix/telldir.c libc/search/hcreate.c: Ditto.
* libc/search/tdelete.c libc/search/tdestroy.c: Ditto.
* libc/search/tfind.c libc/search/tsearch.c: Ditto.
* libc/search/twalk.c libc/signal/signal.c: Ditto.
45 lines
561 B
C
45 lines
561 B
C
/*
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FUNCTION
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<<ffs>>---find first bit set in a word
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INDEX
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ffs
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ANSI_SYNOPSIS
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int ffs(int <[word]>);
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TRAD_SYNOPSIS
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int ffs(<[word]>);
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DESCRIPTION
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<<ffs>> returns the first bit set in a word.
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RETURNS
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<<ffs>> returns 0 if <[c]> is 0, 1 if <[c]> is odd, 2 if <[c]> is a multiple of
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2, etc.
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PORTABILITY
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<<ffs>> is not ANSI C.
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No supporting OS subroutines are required. */
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#include <_ansi.h>
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int
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_DEFUN(ffs, (word),
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int word)
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{
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int i;
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if (!word)
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return 0;
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i = 0;
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for (;;)
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{
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if (((1 << i++) & word) != 0)
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return i;
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}
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}
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