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From: randy@cbmvax.cbm.UUCP (Randy Weiner)
Newsgroups: net.micro.amiga
Subject: Re: Console device question
Message-ID: <258@cbmvax.cbmvax.cbm.UUCP>
Date: Mon, 19-May-86 15:32:36 EDT
Article-I.D.: cbmvax.258
Posted: Mon May 19 15:32:36 1986
Date-Received: Fri, 23-May-86 05:37:03 EDT
References: <2563@decwrl.DEC.COM> <151400032@uicsl>
Reply-To: randy@cbmvax.UUCP (Randy Weiner)
Organization: Commodore Technology, West Chester, PA
Lines: 48

In article <151400032@uicsl> hr@uicsl.UUCP writes:
>
>	"...>there is a program called 'cons.c'..."
>
>	"...I have typed and run the program without any problems..."
>
>I had a lot of problems and I may have found a bug because of
>them. I believe the goto labels 1-9 are off by a row. If an Openxxxx
>call fails, the program jumps to the matching Closexxxx. Guess what
>happens if CloseLibrary is passed a null pointer?

   I have compiled and run the console example called "cons.c" that
is found in the 1.1 version of the Rom Kernal Manual. It works as
listed. But, you must make sure that you are running the correct
version(s).

   The compiler MUST be version 3.03 (v1.1) AND, you should be certain
that the library files, Amiga.lib and Lc.lib were copied from the 
V1.1 release disk. This example will not run under V1.0 (3.02)!

>
>Are the first two OpenLibrary calls necessary?
>----

   For the dos.library, no. This library is opened by the startup
code, either Lstartup.asm or Astartup.asm. You can check this
yourself by looking at these files. They may be found on
the distribution disk, sub-dir "examples".

  I don't see any reason for including diskfont.library, 
there are no calls to the font library. You should be able
to remove the reference.


In general, I never assume a library base pointer is non-null.
Instead, I close as shown:
	if (dosBase) CloseLibrary(dosBase)

etc. etc.


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Randy Weiner -- Commodore Business Machines <<Amiga Technical Support>>
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