Subversion Repositories scarts

/*

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_ptr__[c+1] & _L);

}