{ Copyright (C) 1981 by Bell Laboratories, Inc., and Whitesmiths Ltd. }
{ index -- find position of character c in string s }
function index (var s : string; c : character) : integer;
var
	i : integer;
begin
	i := 1;
	while (s[i] <> c) and (s[i] <> ENDSTR) do
		i := i + 1;
	if (s[i] = ENDSTR) then
		index := 0
	else
		index := i
end;