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225 wiersze
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<!-- received="Tue Apr 27 15:28:36 1999 PDT" -->
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<!-- sent="Wed, 28 Apr 1999 00:32:11 +0200" -->
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<!-- name="Petter Reinholdtsen" -->
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<!-- email="pere@hungry.com" -->
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<!-- subject="Patch: sane_init() may fail" -->
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<!-- id="199904272232.AAA24299@lee.Cc.Uit.No" -->
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<!-- inreplyto="" -->
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<title>sane-devel: Patch: sane_init() may fail</title>
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<h1>Patch: sane_init() may fail</h1>
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<b>Petter Reinholdtsen</b> (<a href="mailto:pere@hungry.com"><i>pere@hungry.com</i></a>)<br>
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<i>Wed, 28 Apr 1999 00:32:11 +0200</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#392">[ date ]</a><a href="index.html#392">[ thread ]</a><a href="subject.html#392">[ subject ]</a><a href="author.html#392">[ author ]</a>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0393.html">Petter Reinholdtsen: "Patch: Autogenerate lsm entry"</a>
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<li> <b>Previous message:</b> <a href="0391.html">Petter Reinholdtsen: "Re: May sane_init fail?"</a>
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</ul>
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<!-- body="start" -->
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Here is my patch to document and implement the changes required to let<br>
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sane_init() fail. It is relative to SANE 1.0.1.<br>
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<p>
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diff -ur sane-1.0.1/ChangeLog sane-1.0.1-pere/ChangeLog<br>
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--- sane-1.0.1/ChangeLog Mon Apr 19 18:21:33 1999<br>
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+++ sane-1.0.1-pere/ChangeLog Wed Apr 28 00:28:01 1999<br>
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@@ -1,3 +1,10 @@<br>
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+1999-04-28 Petter Reinholdtsen <<a href="mailto:pere@td.org.uit.no">pere@td.org.uit.no</a>><br>
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+<br>
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+ * doc/sane.tex frontend/scanimage.c frontend/xcam.c<br>
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+ frontend/xscanimage.c: Specified valid return values for<br>
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+ sane_init(), and made sure all our frontends checks for the<br>
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+ correct return value before using other methods in the backend.<br>
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+<br>
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1999-04-19 David Mosberger-Tang <<a href="mailto:David.Mosberger@acm.org">David.Mosberger@acm.org</a>><br>
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<br>
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* Version 1.0.1 released.<br>
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diff -ur sane-1.0.1/doc/sane.tex sane-1.0.1-pere/doc/sane.tex<br>
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--- sane-1.0.1/doc/sane.tex Sat Apr 3 23:16:07 1999<br>
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+++ sane-1.0.1-pere/doc/sane.tex Wed Apr 28 00:17:31 1999<br>
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@@ -1052,9 +1052,11 @@<br>
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<br>
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This function must be called before any other SANE function can be<br>
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called. The behavior of a SANE backend is undefined if this function<br>
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-is not called first. The version code of the backend is returned in<br>
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-the value pointed to by \code{version\_code}. If that pointer is<br>
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-\code{NULL}, no version code is returned. <br>
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+is not called first. The behavior of a backend is also undefined if<br>
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+this function returns anything other then \code{SANE\_STATUS\_GOOD}.<br>
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+The version code of the backend is returned in the value pointed to by<br>
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+\code{version\_code}. If that pointer is \code{NULL}, no version code<br>
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+is returned.<br>
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Argument \code{authorize} is either a pointer to a function that is<br>
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invoked when the backend requires authentication for a specific<br>
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resource or \code{NULL} if the frontend does not support<br>
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@@ -1064,6 +1066,16 @@<br>
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SANE_Status sane_init (SANE_Int * version_code,<br>
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SANE_Authorization_Callback authorize);<br>
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\end{verbatim}<br>
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+\end{quote}<br>
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+<br>
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+This function may fail with one of the following status codes.<br>
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+\begin{quote}<br>
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+\begin{description}<br>
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+\item[\code{SANE\_STATUS\_UNSUPPORTED}:] The backend is not supported on <br>
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+ this machines current configuration.<br>
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+\item[\code{SANE\_STATUS\_NO\_MEM}:] An insufficent amount of memory<br>
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+ is available to complete. Try later when more memory is available.<br>
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+\end{description}<br>
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\end{quote}<br>
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<br>
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The authorization function may be called by a backend in response to<br>
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diff -ur sane-1.0.1/frontend/scanimage.c sane-1.0.1-pere/frontend/scanimage.c<br>
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--- sane-1.0.1/frontend/scanimage.c Fri Mar 5 07:13:49 1999<br>
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+++ sane-1.0.1-pere/frontend/scanimage.c Wed Apr 28 00:28:44 1999<br>
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@@ -73,6 +73,7 @@<br>
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static SANE_Handle device;<br>
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static int verbose;<br>
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static int test;<br>
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+static int list;<br>
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static int help;<br>
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static const char * prog_name;<br>
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static SANE_Option_Descriptor window_option[2];<br>
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@@ -1041,6 +1042,29 @@<br>
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free (image.data);<br>
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}<br>
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<br>
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+void<br>
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+list_devices(void)<br>
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+{<br>
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+ const SANE_Device ** device_list;<br>
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+ SANE_Status status;<br>
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+ int i;<br>
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+<br>
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+ status = sane_get_devices (&device_list, SANE_FALSE);<br>
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+ if (status != SANE_STATUS_GOOD)<br>
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+ {<br>
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+ fprintf (stderr, "%s: sane_get_devices() failed: %s\n",<br>
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+ prog_name, sane_strstatus (status));<br>
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+ return;<br>
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+ }<br>
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+<br>
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+ for (i = 0; device_list[i]; ++i)<br>
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+ {<br>
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+ printf ("device `%s' is a %s %s %s\n",<br>
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+ device_list[i]->name, device_list[i]->vendor,<br>
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+ device_list[i]->model, device_list[i]->type);<br>
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+ }<br>
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+}<br>
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+<br>
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int<br>
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main (int argc, char **argv)<br>
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{<br>
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@@ -1060,8 +1084,6 @@<br>
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else<br>
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prog_name = argv[0];<br>
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<br>
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- sane_init (0, 0);<br>
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-<br>
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/* make a first pass through the options with error printing and argument<br>
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permutation disabled: */<br>
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opterr = 0;<br>
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@@ -1079,27 +1101,7 @@<br>
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case 'h': help = 1; break;<br>
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case 'v': ++verbose; break;<br>
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case 'T': test= 1; break;<br>
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- case 'L':<br>
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- {<br>
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- int i;<br>
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-<br>
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- status = sane_get_devices (&device_list, SANE_FALSE);<br>
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- if (status != SANE_STATUS_GOOD)<br>
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- {<br>
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- fprintf (stderr, "%s: sane_get_devices() failed: %s\n",<br>
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- prog_name, sane_strstatus (status));<br>
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- exit (1);<br>
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- }<br>
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-<br>
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- for (i = 0; device_list[i]; ++i)<br>
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- {<br>
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- printf ("device `%s' is a %s %s %s\n",<br>
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- device_list[i]->name, device_list[i]->vendor,<br>
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- device_list[i]->model, device_list[i]->type);<br>
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- }<br>
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- exit (0);<br>
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- }<br>
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-<br>
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+ case 'L': list = 1; break;<br>
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case 'V':<br>
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printf ("scanimage (%s) %s\n", PACKAGE, VERSION);<br>
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exit (0);<br>
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@@ -1122,6 +1124,18 @@<br>
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-v, --verbose give even more status messages\n\<br>
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-V, --version print version information\n",<br>
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prog_name);<br>
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+<br>
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+ if (SANE_STATUS_GOOD != sane_init (NULL, NULL))<br>
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+ {<br>
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+ fprintf(stderr,"sane_init() failed. Unable to do anything. Exiting\n");<br>
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+ return(1);<br>
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+ }<br>
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+<br>
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+ if (list)<br>
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+ {<br>
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+ list_devices();<br>
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+ return(0);<br>
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+ }<br>
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<br>
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if (!devname)<br>
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{<br>
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diff -ur sane-1.0.1/frontend/xcam.c sane-1.0.1-pere/frontend/xcam.c<br>
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--- sane-1.0.1/frontend/xcam.c Sat Apr 4 06:39:20 1998<br>
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+++ sane-1.0.1-pere/frontend/xcam.c Tue Apr 27 23:54:56 1999<br>
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@@ -894,7 +894,11 @@<br>
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/* turn on by default as we don't support graphical geometry selection */<br>
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preferences.advanced = 1;<br>
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<br>
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- sane_init (NULL, 0);<br>
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+ if (SANE_STATUS_GOOD != sane_init (NULL, NULL))<br>
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+ {<br>
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+ fprintf(stderr,"sane_init() failed. Unable to do anything. Exiting\n");<br>
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+ return(1);<br>
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+ }<br>
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<br>
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gdk_set_show_events (0);<br>
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gtk_init (&argc, &argv);<br>
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diff -ur sane-1.0.1/frontend/xscanimage.c sane-1.0.1-pere/frontend/xscanimage.c<br>
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--- sane-1.0.1/frontend/xscanimage.c Sat Apr 3 06:07:57 1999<br>
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+++ sane-1.0.1-pere/frontend/xscanimage.c Tue Apr 27 23:56:42 1999<br>
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@@ -257,7 +257,12 @@<br>
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nargs, nreturn_vals,<br>
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args, return_vals);<br>
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<br>
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- sane_init (0, 0);<br>
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+ if (SANE_STATUS_GOOD != sane_init (NULL, NULL))<br>
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+ {<br>
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+ fprintf(stderr,"sane_init() failed. Unable to do anything. Exiting\n");<br>
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+ return(1);<br>
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+ }<br>
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+<br>
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sane_get_devices (&devlist, SANE_FALSE);<br>
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<br>
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for (i = 0; devlist[i]; ++i)<br>
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<p>
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<pre>
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--
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##> Petter Reinholdtsen <## | <a href="mailto:pere@td.org.uit.no">pere@td.org.uit.no</a>
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<a href="http://www.hungry.com/~pere/">http://www.hungry.com/~pere/</a> O- | Go Mozilla, go! Go!
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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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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</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="0393.html">Petter Reinholdtsen: "Patch: Autogenerate lsm entry"</a>
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<li> <b>Previous message:</b> <a href="0391.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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