forked from KolibriOS/kolibrios
44 lines
926 B
C
44 lines
926 B
C
|
|
/*
|
|
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] & (_U|_L)) == _L);
|
|
}
|
|
|