From: lat@iki.fi (Lassi A. Tuura) Subject: Re: some unusual errors 22 Sep 1998 20:21:57 -0700 Message-ID: References: <199809211652.MAA13143@venus.solidum.com> Reply-To: "Lassi A. Tuura" Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII To: Michael Richardson Cc: Michael Hirmke , gnu-win32@cygnus.com |> Why would you say "unsigned char"?? |> It says "int" to me. |> So, a signed char should promote to int just fine. The only negative value allowed with these functions is EOF (if it is negative)---see the quotes earlier in this thread. If you have a signed character that really is negative, it will promote to a negative integer and you end up with undefined behaviour. gcc is nice enough to give you a warning about that. You need to cast the character to `unsigned char' before using it in the is* predicates. Cheers, //lat -- With sufficient thrust, pigs fly just fine. However, this is not necessarily a good idea. It is hard to be sure where they are going to land, and it could be dangerous sitting under them as they fly overhead. --RFC1925, "The Twelve Networking Truths" - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request@cygnus.com" with one line of text: "help".