sane-project-website/old-archive/2001-05/0196.html

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<TITLE>sane-devel: Re: DBG(0, ...)</TITLE>
<META NAME="Author" CONTENT="Henning Meier-Geinitz (henning@meier-geinitz.de)">
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<H1>Re: DBG(0, ...)</H1>
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:henning@meier-geinitz.de?Subject=Re:%20DBG(0,%20...)&In-Reply-To=&lt;20010514201404.G30504@vortex.swb.de&gt;"><EM>henning@meier-geinitz.de</EM></A>)<BR>
<STRONG>Date:</STRONG> Mon May 14 2001 - 11:14:04 PDT
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Hi,
<BR>
<P>On Mon, May 14, 2001 at 10:16:35AM +0200, Petter Reinholdtsen wrote:
<BR>
<EM>&gt; I believe there is a misfeature in the DBG() functions. Peter Fales
</EM><BR>
<EM>&gt; pointed out to me that the following code in a backend
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; DBG(0, &quot;foo&quot;);
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; will print out &quot;foo&quot; even if SANE_DEBUG_BACKEND is not set. I believe
</EM><BR>
<EM>&gt; this is wrong. I believe DBG() should not print anything unless
</EM><BR>
<EM>&gt; debugging is enabled for that specific backend. I suggest applying
</EM><BR>
<EM>&gt; this patch to fix it. Is there anything I haven't thought about?
</EM><BR>
<P>I don't know if this was intentional but I like the current behaviour.
<BR>
It should be clear that DBG(0,...) should be used with care and only
<BR>
when the backend has detected a scanner that is supported (at least in
<BR>
principle) by the backend. E.g. I'm using this in mustek.c to print a
<BR>
warning when a scanner is used that nobody has tested yet but which is
<BR>
a Mustek scanner.
<BR>
<P>So I'm voting for the old behaviour.
<BR>
<P><EM>&gt; The patch changes the default level to be (in practise, not in
</EM><BR>
<EM>&gt; reality) -1, instead of the previous default level 0.
</EM><BR>
<P>If I remeber correctly at least one backend (microtek?) uses the debug
<BR>
level directly. So probably it will be confused about this.
<BR>
Also the &quot;[sanei_debug] Setting debug level ...&quot; isn't printed any more.
<BR>
<P>Bye,
<BR>
&nbsp;&nbsp;Henning
<BR>
<P><PRE>
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