islower.c from Gdb at Krugle
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/*
FUNCTION
<<islower>>---lowercase character predicate
INDEX
islower
ANSI_SYNOPSIS
#include <ctype.h>
int islower(int <[c]>);
TRAD_SYNOPSIS
#include <ctype.h>
int islower(<[c]>);
DESCRIPTION
<<islower>> is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for minuscules
(lowercase alphabetic characters), and 0 for other characters.
It is defined only when <<isascii>>(<[c]>) is true or <[c]> is EOF.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using `<<#undef islower>>'.
RETURNS
<<islower>> returns non-zero if <[c]> is a lowercase letter (<<a>>--<<z>>).
PORTABILITY
<<islower>> is ANSI C.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef islower
int
_DEFUN(islower,(c),int c)
{
return((_ctype_ + 1)[c] & _L);
}
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