isupper.c from Gdb at Krugle
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/*
FUNCTION
<<isupper>>---uppercase character predicate
INDEX
isupper
ANSI_SYNOPSIS
#include <ctype.h>
int isupper(int <[c]>);
TRAD_SYNOPSIS
#include <ctype.h>
int isupper(<[c]>);
DESCRIPTION
<<isupper>> is a macro which classifies ASCII integer values by table
lookup. It is a predicate returning non-zero for uppercase letters
(<<A>>--<<Z>>), 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 isupper>>'.
RETURNS
<<isupper>> returns non-zero if <[c]> is a uppercase letter (A-Z).
PORTABILITY
<<isupper>> is ANSI C.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef isupper
int
_DEFUN(isupper,(c),int c)
{
return((_ctype_ + 1)[c] & _U);
}
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