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<div class="title">cmdlineopt.cpp</div> </div>
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<div class="fragment"><div class="line"><span class="comment">// Copyright (C) 2001 Gianni Mariani</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This program is free software; you can redistribute it and/or modify</span></div>
<div class="line"><span class="comment">// it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><span class="comment">// the Free Software Foundation; either version 2 of the License, or</span></div>
<div class="line"><span class="comment">// (at your option) any later version.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This program is distributed in the hope that it will be useful,</span></div>
<div class="line"><span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><span class="comment">// GNU General Public License for more details.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// You should have received a copy of the GNU General Public License</span></div>
<div class="line"><span class="comment">// along with this program; if not, write to the Free Software</span></div>
<div class="line"><span class="comment">// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// As a special exception to the GNU General Public License, permission is</span></div>
<div class="line"><span class="comment">// granted for additional uses of the text contained in its release</span></div>
<div class="line"><span class="comment">// of Common C++.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// The exception is that, if you link the Common C++ library with other</span></div>
<div class="line"><span class="comment">// files to produce an executable, this does not by itself cause the</span></div>
<div class="line"><span class="comment">// resulting executable to be covered by the GNU General Public License.</span></div>
<div class="line"><span class="comment">// Your use of that executable is in no way restricted on account of</span></div>
<div class="line"><span class="comment">// linking the Common C++ library code into it.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This exception does not however invalidate any other reasons why</span></div>
<div class="line"><span class="comment">// the executable file might be covered by the GNU General Public License.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This exception applies only to the code released under the</span></div>
<div class="line"><span class="comment">// name Common C++. If you copy code from other releases into a copy of</span></div>
<div class="line"><span class="comment">// Common C++, as the General Public License permits, the exception does</span></div>
<div class="line"><span class="comment">// not apply to the code that you add in this way. To avoid misleading</span></div>
<div class="line"><span class="comment">// anyone as to the status of such modified files, you must delete</span></div>
<div class="line"><span class="comment">// this exception notice from them.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// If you write modifications of your own for Common C++, it is your choice</span></div>
<div class="line"><span class="comment">// whether to permit this exception to apply to your modifications.</span></div>
<div class="line"><span class="comment">// If you do not wish that, delete this exception notice.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// Example for Common C++ the command line parser interface.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This exmaple code shows how to use the command line parser provided by</span></div>
<div class="line"><span class="comment">// CommonC++. The command line parser provides an interface which is</span></div>
<div class="line"><span class="comment">// "object oriented" such that command line parameters are true "objects".</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// Each command line option needs to be created. By defining "CommandOption"s</span></div>
<div class="line"><span class="comment">// statically, the C++ constructor is called when the objects are loaded and</span></div>
<div class="line"><span class="comment">// before the "main" function is called. The constructor links itself to</span></div>
<div class="line"><span class="comment">// a list of other CommandOptionXXX in the list provided. If no</span></div>
<div class="line"><span class="comment">// list is specified in the constructor, a default one is used. Because of</span></div>
<div class="line"><span class="comment">// the undefined nature as to the order in which constructors are called,</span></div>
<div class="line"><span class="comment">// no assumption as to the order in which the CommandOptionXXX constructors</span></div>
<div class="line"><span class="comment">// are called should be made.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// CommandOptionXXX classes can be used to derive specialized parameter</span></div>
<div class="line"><span class="comment">// classes that are specific to applications. The second example shows</span></div>
<div class="line"><span class="comment">// just how this can be done.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// Include the CommandOption definitions</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="common_8h.html">cc++/common.h</a>></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <iostream></span></div>
<div class="line"><span class="preprocessor">#ifndef WIN32</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#include <cstdlib></span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><span class="preprocessor">#ifdef CCXX_NAMESPACES</span></div>
<div class="line"><span class="preprocessor"></span><span class="keyword">using namespace </span>std;</div>
<div class="line"><span class="keyword">using namespace </span>ost;</div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// The following definition of options all use the list header</span></div>
<div class="line"><span class="comment">// defaultCommandOptionList (which is specified as the value of the</span></div>
<div class="line"><span class="comment">// default parameter in the constructor. This convention would</span></div>
<div class="line"><span class="comment">// allow other object files to link into the same list and add parameters</span></div>
<div class="line"><span class="comment">// to the command line of this executable.</span></div>
<div class="line"></div>
<div class="line"><a name="_a0"></a><a class="code" href="classost_1_1_command_option_arg.html">CommandOptionArg</a> test_option1(</div>
<div class="line"> <span class="stringliteral">"test_option1"</span>, <span class="stringliteral">"p"</span>, <span class="stringliteral">"This option takes an argument"</span>, <span class="keyword">true</span></div>
<div class="line">);</div>
<div class="line"></div>
<div class="line"><a name="_a1"></a><a class="code" href="classost_1_1_command_option_no_arg.html">CommandOptionNoArg</a> test_noarg(</div>
<div class="line"> <span class="stringliteral">"test_noarg"</span>, <span class="stringliteral">"b"</span>, <span class="stringliteral">"This option does not take an argument"</span></div>
<div class="line">);</div>
<div class="line"></div>
<div class="line"><a class="code" href="classost_1_1_command_option_no_arg.html">CommandOptionNoArg</a> helparg(</div>
<div class="line"> <span class="stringliteral">"help"</span>, <span class="stringliteral">"?"</span>, <span class="stringliteral">"Print help usage"</span></div>
<div class="line">);</div>
<div class="line"></div>
<div class="line"><a name="_a2"></a><a class="code" href="classost_1_1_command_option_collect.html">CommandOptionCollect</a> restoargs(</div>
<div class="line"> 0, 0, <span class="stringliteral">"Collect all the parameters"</span>, <span class="keyword">true</span></div>
<div class="line">);</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// Normally this would me the regular main(). In this example</span></div>
<div class="line"><span class="comment">// this processes the first command option list.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="keywordtype">int</span> Example_main( <span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> ** argv )</div>
<div class="line">{</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Create a CommandOptionParse object. This takes the</span></div>
<div class="line"> <span class="comment">// defaultCommandOptionList and parses the command line arguments.</span></div>
<div class="line"> <span class="comment">//</span></div>
<div class="line"> <a name="_a3"></a><a class="code" href="classost_1_1_command_option_parse.html">CommandOptionParse</a> * args = <a name="a4"></a><a class="code" href="namespaceost.html#a282d97c4c4323467d6e8b82cb93ec89d">makeCommandOptionParse</a>(</div>
<div class="line"> argc, argv,</div>
<div class="line"> <span class="stringliteral">"CommonC++ command like option interface. This is example\n"</span></div>
<div class="line"> <span class="stringliteral">" code only."</span></div>
<div class="line"> );</div>
<div class="line"></div>
<div class="line"> <span class="comment">// If the user requested help then suppress all the usage error</span></div>
<div class="line"> <span class="comment">// messages.</span></div>
<div class="line"> <span class="keywordflow">if</span> ( helparg.numSet ) {</div>
<div class="line"> cerr << args-><a name="a5"></a><a class="code" href="classost_1_1_command_option_parse.html#a7dc375ddeff083528d143a1ffdb67e16">printUsage</a>();</div>
<div class="line"> ::exit(0);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Print usage your way.</span></div>
<div class="line"> <span class="keywordflow">if</span> ( args-><a name="a6"></a><a class="code" href="classost_1_1_command_option_parse.html#af8f0828a668ba000ea6ecc4de1d2c5b3">argsHaveError</a>() ) {</div>
<div class="line"> cerr << args-><a name="a7"></a><a class="code" href="classost_1_1_command_option_parse.html#af2176dfc5ec12e3b4fb9f39334f5173a">printErrors</a>();</div>
<div class="line"> cerr << args-><a class="code" href="classost_1_1_command_option_parse.html#a7dc375ddeff083528d143a1ffdb67e16">printUsage</a>();</div>
<div class="line"> ::exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Go off and run any option specific task</span></div>
<div class="line"> args-><a name="a8"></a><a class="code" href="classost_1_1_command_option_parse.html#a060afd8cbb6e8395191cef1cb68520ea">performTask</a>();</div>
<div class="line"></div>
<div class="line"> <span class="comment">// print all the -p options</span></div>
<div class="line"> <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < test_option1.numValue; i ++ ) {</div>
<div class="line"> cerr << <span class="stringliteral">"test_option1 = "</span> << test_option1.values[ i ] << endl;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// print all the other options.</span></div>
<div class="line"> <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < restoargs.numValue; i ++ ) {</div>
<div class="line"> cerr << <span class="stringliteral">"restoargs "</span> << i << <span class="stringliteral">" : "</span> << restoargs.values[ i ] << endl;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keyword">delete</span> args;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This shows how to build a second option list. The example is similar to</span></div>
<div class="line"><span class="comment">// the first as well as it shows how to derive a new command object.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"></div>
<div class="line"><a name="_a9"></a><a class="code" href="classost_1_1_command_option.html">CommandOption</a> * TestList = 0;</div>
<div class="line"></div>
<div class="line"><span class="keyword">extern</span> <a name="_a10"></a><a class="code" href="classost_1_1_command_option_rest.html">CommandOptionRest</a> test_restoargs;</div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <unistd.h></span></div>
<div class="line"><span class="preprocessor">#include <sys/types.h></span></div>
<div class="line"><span class="preprocessor">#include <sys/stat.h></span></div>
<div class="line"><span class="preprocessor">#include <fcntl.h></span></div>
<div class="line"><span class="preprocessor">#include <errno.h></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="string_8h.html">string.h</a>></span></div>
<div class="line"><span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><span class="preprocessor">#include <sys/wait.h></span></div>
<div class="line"><span class="preprocessor">#include <strstream></span></div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This is a parameter class derived from CommandOptionArg that takes</span></div>
<div class="line"><span class="comment">// a file name parameter and detects wether the file is accessible</span></div>
<div class="line"><span class="comment">// flagging an error if the file is inaccessible to read.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="keyword">class </span>file_option : <span class="keyword">public</span> <a class="code" href="classost_1_1_command_option_arg.html">CommandOptionArg</a> {</div>
<div class="line"><span class="keyword">public</span>:</div>
<div class="line"></div>
<div class="line"> <span class="comment">// the constructor calls the regular CommandOptionArg constructor</span></div>
<div class="line"> <span class="comment">// and all should be well.</span></div>
<div class="line"> file_option(</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> * in_option_name,</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> * in_option_letter,</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> * in_description,</div>
<div class="line"> <span class="keywordtype">bool</span> in_required = <span class="keyword">false</span>,</div>
<div class="line"> <a class="code" href="classost_1_1_command_option.html">CommandOption</a> ** pp_next = & <a name="a11"></a><a class="code" href="namespaceost.html#a3b701311bbf7cf16f954820e316f5766">defaultCommandOptionList</a></div>
<div class="line"> )</div>
<div class="line"> : <a class="code" href="classost_1_1_command_option_arg.html">CommandOptionArg</a>(</div>
<div class="line"> in_option_name,</div>
<div class="line"> in_option_letter,</div>
<div class="line"> in_description,</div>
<div class="line"> in_required,</div>
<div class="line"> pp_next</div>
<div class="line"> )</div>
<div class="line"> {</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">//</span></div>
<div class="line"> <span class="comment">// When parsing is done check if the file is accessible and register</span></div>
<div class="line"> <span class="comment">// an error with the CommandOptionParse object to let it know so.</span></div>
<div class="line"> <span class="keyword">virtual</span> <span class="keywordtype">void</span> parseDone( <a class="code" href="classost_1_1_command_option_parse.html">CommandOptionParse</a> * cop ) {</div>
<div class="line"> <span class="keywordflow">if</span> ( numValue ) {</div>
<div class="line"> <span class="keywordflow">if</span> ( ::access( values[ numValue - 1 ], R_OK ) ) {</div>
<div class="line"> <span class="keywordtype">int</span> errno_s = errno;</div>
<div class="line"> strstream msg;</div>
<div class="line"> msg << <span class="stringliteral">"Error: "</span> << optionName << <span class="stringliteral">" '"</span> << values[ numValue - 1 ];</div>
<div class="line"> msg << <span class="stringliteral">"' : "</span> << ::strerror( errno_s );</div>
<div class="line"></div>
<div class="line"> cop-><a name="a12"></a><a class="code" href="classost_1_1_command_option_parse.html#a1ca17c61a4e4c8f40102cfafed61702a">registerError</a>( msg.str() );</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">//</span></div>
<div class="line"> <span class="comment">// Open said file. Do some operations on things - like open the file.</span></div>
<div class="line"> <span class="keywordtype">int</span> OpenFile() {</div>
<div class="line"> <span class="comment">// Should put in way more error handling here ...</span></div>
<div class="line"> return ::open( values[ numValue - 1 ], O_RDONLY );</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">//</span></div>
<div class="line"> <span class="comment">// The most elaborate way to spit the contents of a file</span></div>
<div class="line"> <span class="comment">// to standard output.</span></div>
<div class="line"> pid_t pid;</div>
<div class="line"> <span class="keyword">virtual</span> <span class="keywordtype">void</span> performTask( <a class="code" href="classost_1_1_command_option_parse.html">CommandOptionParse</a> * cop ) {</div>
<div class="line"> pid = ::fork();</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> ( pid ) {</div>
<div class="line"> <span class="keywordflow">return</span>;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordtype">int</span> fd = OpenFile();</div>
<div class="line"> <span class="keywordflow">if</span> ( fd < 0 ) {</div>
<div class="line"> <span class="keywordtype">int</span> errno_s = errno;</div>
<div class="line"> cerr</div>
<div class="line"> << <span class="stringliteral">"Error: '"</span></div>
<div class="line"> << values[ numValue - 1 ]</div>
<div class="line"> << <span class="stringliteral">"' : "</span></div>
<div class="line"> << ::strerror( errno_s )</div>
<div class="line"> ;</div>
<div class="line"></div>
<div class="line"> ::exit( 1 );</div>
<div class="line"> }</div>
<div class="line"> dup2(fd, 0);</div>
<div class="line"> ::execvp( test_restoargs.values[0], (<span class="keywordtype">char</span>**) test_restoargs.values );</div>
<div class="line"> ::exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> ~file_option() {</div>
<div class="line"> <span class="keywordflow">if</span> ( pid <= 0 ) <span class="keywordflow">return</span>;</div>
<div class="line"> <span class="keywordtype">int</span> status;</div>
<div class="line"> <a name="a13"></a><a class="code" href="namespaceost.html#a24c7774639b3768bdd45b65a296f6369">::wait</a>(&status);</div>
<div class="line"> }</div>
<div class="line">};</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This is the linked list head for the options in the second example.</span></div>
<div class="line"><span class="comment">// Note that the first example used the default value defined in the</span></div>
<div class="line"><span class="comment">// method. Here it is explicitly specified as TestList in all the following</span></div>
<div class="line"><span class="comment">// CommandOption constructors.</span></div>
<div class="line"></div>
<div class="line">file_option test_file(</div>
<div class="line"> <span class="stringliteral">"test_file"</span>, <span class="stringliteral">"f"</span>, <span class="stringliteral">"Filename to read from"</span>, <span class="keyword">true</span>, &TestList</div>
<div class="line">);</div>
<div class="line"></div>
<div class="line"><a class="code" href="classost_1_1_command_option_no_arg.html">CommandOptionNoArg</a> test_xnoarg(</div>
<div class="line"> <span class="stringliteral">"test_xnoarg"</span>, <span class="stringliteral">"b"</span>, <span class="stringliteral">"This option does not take an argument"</span>, <span class="keyword">false</span>, &TestList</div>
<div class="line">);</div>
<div class="line"></div>
<div class="line"><a class="code" href="classost_1_1_command_option_no_arg.html">CommandOptionNoArg</a> test_helparg(</div>
<div class="line"> <span class="stringliteral">"help"</span>, <span class="stringliteral">"?"</span>, <span class="stringliteral">"Print help usage"</span>, <span class="keyword">false</span>, &TestList</div>
<div class="line">);</div>
<div class="line"></div>
<div class="line"><a class="code" href="classost_1_1_command_option_rest.html">CommandOptionRest</a> test_restoargs(</div>
<div class="line"> 0, 0, <span class="stringliteral">"Command to be executed"</span>, <span class="keyword">true</span>, &TestList</div>
<div class="line">);</div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// in most apps this would be the regular "main" function.</span></div>
<div class="line"><span class="keywordtype">int</span> Test_main( <span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> ** argv )</div>
<div class="line">{</div>
<div class="line"> <a class="code" href="classost_1_1_command_option_parse.html">CommandOptionParse</a> * args = <a class="code" href="namespaceost.html#a282d97c4c4323467d6e8b82cb93ec89d">makeCommandOptionParse</a>(</div>
<div class="line"> argc, argv,</div>
<div class="line"> <span class="stringliteral">"Command line parser X test.\n"</span></div>
<div class="line"> <span class="stringliteral">" This example is executed when the command ends in 'x'\n"</span></div>
<div class="line"> <span class="stringliteral">" It shows how the -f parameter can be specialized.\n"</span>,</div>
<div class="line"> TestList</div>
<div class="line"> );</div>
<div class="line"></div>
<div class="line"> <span class="comment">// If the user requested help then suppress all the usage error</span></div>
<div class="line"> <span class="comment">// messages.</span></div>
<div class="line"> <span class="keywordflow">if</span> ( test_helparg.numSet ) {</div>
<div class="line"> cerr << args-><a class="code" href="classost_1_1_command_option_parse.html#a7dc375ddeff083528d143a1ffdb67e16">printUsage</a>();</div>
<div class="line"> ::exit(0);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Print usage your way.</span></div>
<div class="line"> <span class="keywordflow">if</span> ( args-><a class="code" href="classost_1_1_command_option_parse.html#af8f0828a668ba000ea6ecc4de1d2c5b3">argsHaveError</a>() ) {</div>
<div class="line"> cerr << args-><a class="code" href="classost_1_1_command_option_parse.html#af2176dfc5ec12e3b4fb9f39334f5173a">printErrors</a>();</div>
<div class="line"> cerr << <span class="stringliteral">"Get help by --help\n"</span>;</div>
<div class="line"> ::exit(1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Go off and run any option specific task</span></div>
<div class="line"> args-><a class="code" href="classost_1_1_command_option_parse.html#a060afd8cbb6e8395191cef1cb68520ea">performTask</a>();</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < test_file.numValue; i ++ ) {</div>
<div class="line"> cerr << <span class="stringliteral">"test_file = "</span> << test_file.values[ i ] << endl;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> ( <span class="keywordtype">int</span> i = 0; i < test_restoargs.numValue; i ++ ) {</div>
<div class="line"> cerr << <span class="stringliteral">"test_restoargs "</span> << i << <span class="stringliteral">" : "</span> << test_restoargs.values[ i ] << endl;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keyword">delete</span> args;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This switches behaviour of this executable depending of wether it is</span></div>
<div class="line"><span class="comment">// invoked with a command ending in "x". This is mimicking for example</span></div>
<div class="line"><span class="comment">// the behaviour of bunzip2 and bzip2. These executables are THE SAME</span></div>
<div class="line"><span class="comment">// file i.e.</span></div>
<div class="line"><span class="comment">// 0 lrwxrwxrwx 1 root root 5 Oct 11 14:04 /usr/bin/bunzip2 -> bzip2*</span></div>
<div class="line"><span class="comment">// and the behaviour is determined by the executable name.</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// This example is way more complex than the way most people will end up</span></div>
<div class="line"><span class="comment">// using feature.</span></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span> main( <span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> ** argv )</div>
<div class="line">{</div>
<div class="line"></div>
<div class="line"> <span class="keywordtype">int</span> i = ::strlen( argv[ 0 ] );</div>
<div class="line"></div>
<div class="line"> <span class="comment">// determine which real "main" function do I call</span></div>
<div class="line"> <span class="keywordflow">if</span> ( argv[ 0 ][ i - 1 ] == <span class="charliteral">'x'</span> ) {</div>
<div class="line"> <span class="keywordflow">return</span> Test_main( argc, argv );</div>
<div class="line"> } <span class="keywordflow">else</span> {</div>
<div class="line"> <span class="keywordflow">return</span> Example_main( argc, argv );</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line">}</div>
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