[GNUnet-SVN] r27544 - gnunet/doc

[gnunet]

Author: wachs
Date: 2013-06-24 11:27:07 +0200 (Mon, 24 Jun 2013)
New Revision: 27544

Modified:
   gnunet/doc/gnunet-c-tutorial.pdf
   gnunet/doc/gnunet-c-tutorial.tex
Log:
Updating the tutorial section in the source and including 
an updated version of the pdf about command line parsing.

This update describes how a developer can check if a 
command line argument was set at all by initializing the 
variables storing the commandline arguments with a 
specific value and checking this value after the run 
function applied the commandline parsing. 



Modified: gnunet/doc/gnunet-c-tutorial.pdf
===================================================================
(Binary files differ)

Modified: gnunet/doc/gnunet-c-tutorial.tex
===================================================================
--- gnunet/doc/gnunet-c-tutorial.tex    2013-06-23 18:17:10 UTC (rev 27543)
+++ gnunet/doc/gnunet-c-tutorial.tex    2013-06-24 09:27:07 UTC (rev 27544)
@@ -594,6 +594,8 @@
      &GNUNET_GETOPT_set_one, &a_flag},
     GNUNET_GETOPT_OPTION_END
   };
+  string_option = NULL;
+  a_flag = GNUNET_SYSERR;
 // ...
 \end{lstlisting}
 
@@ -602,7 +604,10 @@
 using this approach.  Other {\tt GNUNET\_GETOPT\_}-functions can be used
 to obtain integer value options, increment counters, etc.  You can
 even write custom option parsers for special circumstances not covered
-by the available handlers.
+by the available handlers. To check if an argument was specified by the 
+user you initialize the variable with a specific value (e.g. NULL for 
+a string and GNUNET\_SYSERR for a integer) and check after parsing 
+happened if the values were modified.
 
 Inside the {\tt run} method, the program would perform the
 application-specific logic, which typically involves initializing and