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<!-- received="Sun May 2 17:57:21 1999 PDT" -->
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<!-- sent="Mon, 3 May 1999 02:56:31 +0200 (MET DST)" -->
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<!-- name="Ingo Wilken" -->
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<!-- email="Ingo.Wilken@Informatik.Uni-Oldenburg.DE" -->
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<!-- subject="Re: May sane_init fail?" -->
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<!-- id="m10e727-0009zNC@petersfehn.Informatik.Uni-Oldenburg.DE" -->
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<!-- inreplyto="199905022235.AAA30375@lee.Cc.Uit.No" -->
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<title>sane-devel: Re: May sane_init fail?</title>
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<h1>Re: May sane_init fail?</h1>
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<b>Ingo Wilken</b> (<a href="mailto:Ingo.Wilken@Informatik.Uni-Oldenburg.DE"><i>Ingo.Wilken@Informatik.Uni-Oldenburg.DE</i></a>)<br>
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<i>Mon, 3 May 1999 02:56:31 +0200 (MET DST)</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#15">[ date ]</a><a href="index.html#15">[ thread ]</a><a href="subject.html#15">[ subject ]</a><a href="author.html#15">[ author ]</a>
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<li> <b>Next message:</b> <a href="0016.html">Graham Stoney: "Re: Possible fix for Sane 1.0.1 segfault in RedHat 5.1 (net)"</a>
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<li> <b>Previous message:</b> <a href="0014.html">Petter Reinholdtsen: "Re: xsane default sizes"</a>
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<li> <b>In reply to:</b> <a href="0012.html">Petter Reinholdtsen: "Re: May sane_init fail?"</a>
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</ul>
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<!-- body="start" -->
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<i>> > What's the suggested return values for a backend/SANE version</i><br>
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<i>> > mismatch? I'm currently using SANE_STATUS_UNSUPPORTED (seems</i><br>
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<i>> > logical), but SANE_STATUS_INVAL could be used too.</i><br>
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<i>> Eh, the version_code parameter is supposed to be used to report the</i><br>
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<i>> backends version code, right?</i><br>
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<p>
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I'm not talking about the version_code argument, but checking<br>
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SANE_CURRENT_MAJOR in the backend. Let me quote from the docs:<br>
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<p>
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# SANE_CURRENT_MAJOR:<br>
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# The value of this macro is the number of the SANE standard that<br>
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# the interface implements.<br>
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<p>
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# ..., a backend always provides support for one and only one version of the<br>
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# standard.<br>
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<p>
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This seems to imply that any backend has to look at SANE_CURRENT_MAJOR<br>
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to check if it's compatible with the interface (i.e., the library).<br>
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<p>
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# SANE version control also includes a minor version number and a build<br>
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# revision. While control of these numbers remains with the implementor<br>
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# of a backend, the recommended use is as follows. The minor version is<br>
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# incremented with each official release of a backend. The build<br>
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# revision is increased with each build of a backend.<br>
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<p>
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English is not my first language, but "these numbers" obviously refers to<br>
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"a minor version number and a build revision". This whole paragraph clearly<br>
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says that a backend has no control over it's own major version number - only<br>
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the minor number and build revision. Conclusion: The backend's major number<br>
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has to match the SANE major number.<br>
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<p>
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<p>
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If my interpretation is wrong, the paragraph should be rewritten to avoid<br>
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further mistakes - and this check removed from snapscan.c:<br>
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<p>
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/* version check */<br>
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if (V_MAJOR != EXPECTED_MAJOR)<br>
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{<br>
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DBG (DL_MAJOR_ERROR,<br>
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"%s: this version of the SnapScan backend is intended for use\n"<br>
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"with SANE major version %ld, but the major version of this SANE\n"<br>
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"release is %ld. Sorry, but you need a different version of\n"<br>
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"this backend.\n\n",<br>
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me, (long) /*SANE_CURRENT_MAJOR*/V_MAJOR, (long) EXPECTED_MAJOR);<br>
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return SANE_STATUS_INVAL;<br>
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}<br>
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<p>
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<p>
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Regards,<br>
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Ingo<br>
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<p>
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<pre>
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--
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Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0016.html">Graham Stoney: "Re: Possible fix for Sane 1.0.1 segfault in RedHat 5.1 (net)"</a>
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<li> <b>Previous message:</b> <a href="0014.html">Petter Reinholdtsen: "Re: xsane default sizes"</a>
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<li> <b>In reply to:</b> <a href="0012.html">Petter Reinholdtsen: "Re: May sane_init fail?"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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