/*
FUNCTION
<<toupper>>---translate characters to upper case
INDEX
toupper
INDEX
_toupper
ANSI_SYNOPSIS
#include <ctype.h>
int toupper(int <[c]>);
int _toupper(int <[c]>);
TRAD_SYNOPSIS
#include <ctype.h>
int toupper(<[c]>);
int _toupper(<[c]>);
DESCRIPTION
<<toupper>> is a macro which converts lower-case characters to upper
case, leaving all other characters unchanged. It is only defined when
<[c]> is an integer in the range <<EOF>> to <<255>>.
You can use a compiled subroutine instead of the macro definition by
undefining this macro using `<<#undef toupper>>'.
<<_toupper>> performs the same conversion as <<toupper>>, but should
only be used when <[c]> is known to be a lowercase character (<<a>>--<<z>>).
RETURNS
<<toupper>> returns the upper-case equivalent of <[c]> when it is a
character between <<a>> and <<z>>, and <[c]> otherwise.
<<_toupper>> returns the upper-case equivalent of <[c]> when it is a
character between <<a>> and <<z>>. If <[c]> is not one of these
characters, the behaviour of <<_toupper>> is undefined.
PORTABILITY
<<toupper>> is ANSI C. <<_toupper>> is not recommended for portable programs.
No supporting OS subroutines are required.
*/
#include <_ansi.h>
#include <ctype.h>
#undef toupper
int
_DEFUN(toupper,(c),int c)
{
return islower(c) ? c - 'a' + 'A' : c;
}