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/*

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;

}