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/*
FUNCTION
<<isupper>>, <<isupper_l>>---uppercase character predicate
INDEX
isupper
INDEX
isupper_l
SYNOPSIS
#include <ctype.h>
int isupper(int <[c]>);
#include <ctype.h>
int isupper_l(int <[c]>, locale_t <[locale]>);
DESCRIPTION
<<isupper>> is a macro which classifies singlebyte charset values by table
lookup. It is a predicate returning non-zero for uppercase letters
(<<A>>--<<Z>>), and 0 for other characters.
<<isupper_l>> is like <<isupper>> 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 isupper>>' or `<<#undef isupper_l>>'.
RETURNS
<<isupper>>, <<isupper_l>> return non-zero if <[c]> is an uppercase letter.
PORTABILITY
<<isupper>> is ANSI C.
<<isupper_l>> is POSIX-1.2008.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef isupper
int
isupper (int c)
{
return ((__CTYPE_PTR[c+1] & (_U|_L)) == _U);
}
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