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/*
FUNCTION
<<islower>>, <<islower_l>>---lowercase character predicate
INDEX
islower
INDEX
islower_l
SYNOPSIS
#include <ctype.h>
int islower(int <[c]>);
#include <ctype.h>
int islower_l(int <[c]>, locale_t <[locale]>);
DESCRIPTION
<<islower>> is a macro which classifies singlebyte charset 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 if <[c]> is representable as an unsigned char or if
<[c]> is EOF.
<<islower_l>> is like <<islower>> but performs the check based on the
locale specified by the locale object locale. If <[locale]> is
LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
You can use a compiled subroutine instead of the macro definition by
undefining the macro using `<<#undef islower>>' or `<<#undef islower_l>>'.
RETURNS
<<islower>>, <<islower_l>> return non-zero if <[c]> is a lowercase letter.
PORTABILITY
<<islower>> is ANSI C.
<<islower_l>> is POSIX-1.2008.
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);
}
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