Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/_g_e_t_o_p_t_8_c_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/Stdlib/ConsoleApp/GETOPT.C</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).</span>
<a name="l00002"></a>00002 <span class="comment">// All rights reserved.</span>
<a name="l00003"></a>00003 <span class="comment">// This component and the accompanying materials are made available</span>
<a name="l00004"></a>00004 <span class="comment">// under the terms of "Eclipse Public License v1.0"</span>
<a name="l00005"></a>00005 <span class="comment">// which accompanies this distribution, and is available</span>
<a name="l00006"></a>00006 <span class="comment">// at the URL "http://www.eclipse.org/legal/epl-v10.html".</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// Initial Contributors:</span>
<a name="l00009"></a>00009 <span class="comment">// Nokia Corporation - initial contribution.</span>
<a name="l00010"></a>00010 <span class="comment">//</span>
<a name="l00011"></a>00011 <span class="comment">// Contributors:</span>
<a name="l00012"></a>00012 <span class="comment">//</span>
<a name="l00013"></a>00013 <span class="comment">// Description:</span>
<a name="l00014"></a>00014 <span class="comment">//</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="preprocessor">#if defined(LIBC_SCCS) && !defined(lint)</span>
<a name="l00017"></a>00017 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">char</span> sccsid[] = <span class="stringliteral">"@(#)getopt.c 8.2 (Berkeley) 4/2/94"</span>;
<a name="l00018"></a>00018 <span class="preprocessor">#endif </span><span class="comment">/* LIBC_SCCS and not lint */</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="preprocessor">#include <stdio.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00022"></a>00022 <span class="preprocessor">#include <string.h></span>
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="keywordtype">int</span> opterr = 1, <span class="comment">/* if error message should be printed */</span>
<a name="l00025"></a>00025 optind = 1, <span class="comment">/* index into parent argv vector */</span>
<a name="l00026"></a>00026 optopt, <span class="comment">/* character checked for validity */</span>
<a name="l00027"></a>00027 optreset; <span class="comment">/* reset getopt */</span>
<a name="l00028"></a>00028 <span class="keywordtype">char</span> *optarg; <span class="comment">/* argument associated with option */</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#define BADCH (int)'?'</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#define BADARG (int)':'</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span><span class="preprocessor">#define EMSG ""</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span>
<a name="l00034"></a>00034 <span class="comment">/*</span>
<a name="l00035"></a>00035 <span class="comment"> * getopt --</span>
<a name="l00036"></a>00036 <span class="comment"> * Parse argc/argv argument vector.</span>
<a name="l00037"></a>00037 <span class="comment"> */</span>
<a name="l00038"></a>00038 <span class="keywordtype">int</span>
<a name="l00039"></a>00039 getopt(<span class="keywordtype">int</span> nargc, <span class="keywordtype">char</span> * <span class="keyword">const</span> *nargv, <span class="keyword">const</span> <span class="keywordtype">char</span> *ostr)
<a name="l00040"></a>00040 {
<a name="l00041"></a>00041 <span class="comment">// extern char *__progname;</span>
<a name="l00042"></a>00042 <span class="keyword">static</span> <span class="keywordtype">char</span> *place = EMSG; <span class="comment">/* option letter processing */</span>
<a name="l00043"></a>00043 <span class="keywordtype">char</span> *oli=NULL; <span class="comment">/* option letter list index */</span>
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="keywordflow">if</span> (optreset || !*place) { <span class="comment">/* update scanning pointer */</span>
<a name="l00046"></a>00046 optreset = 0;
<a name="l00047"></a>00047 <span class="keywordflow">if</span> (optind >= nargc || *(place = nargv[optind]) != <span class="charliteral">'-'</span>) {
<a name="l00048"></a>00048 place = EMSG;
<a name="l00049"></a>00049 <span class="keywordflow">return</span> (EOF);
<a name="l00050"></a>00050 }
<a name="l00051"></a>00051 <span class="keywordflow">if</span> (place[1] && *++place == <span class="charliteral">'-'</span>) { <span class="comment">/* found "--" */</span>
<a name="l00052"></a>00052 ++optind;
<a name="l00053"></a>00053 place = EMSG;
<a name="l00054"></a>00054 <span class="keywordflow">return</span> (EOF);
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 } <span class="comment">/* option letter okay? */</span>
<a name="l00057"></a>00057
<a name="l00058"></a>00058 optopt = (int)*place++;
<a name="l00059"></a>00059 <span class="keywordflow">if</span> (optopt != (<span class="keywordtype">int</span>)<span class="charliteral">':'</span>) oli = strchr(ostr, optopt);
<a name="l00060"></a>00060 <span class="keywordflow">if</span> ((optopt == (<span class="keywordtype">int</span>)<span class="charliteral">':'</span>) || !oli)
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062 <span class="comment">/*</span>
<a name="l00063"></a>00063 <span class="comment"> * if the user didn't specify '-' as an option,</span>
<a name="l00064"></a>00064 <span class="comment"> * assume it means EOF.</span>
<a name="l00065"></a>00065 <span class="comment"> */</span>
<a name="l00066"></a>00066 <span class="keywordflow">if</span> (optopt == (<span class="keywordtype">int</span>)<span class="charliteral">'-'</span>)
<a name="l00067"></a>00067 <span class="keywordflow">return</span> (EOF);
<a name="l00068"></a>00068 <span class="keywordflow">if</span> (!*place)
<a name="l00069"></a>00069 ++optind;
<a name="l00070"></a>00070 <span class="keywordflow">if</span> (opterr && *ostr != <span class="charliteral">':'</span>)
<a name="l00071"></a>00071 (void)fprintf(stderr,
<a name="l00072"></a>00072 <span class="comment">// "%s: illegal option -- %c\n", __progname, optopt);</span>
<a name="l00073"></a>00073 <span class="stringliteral">"illegal option -- %c\n"</span>, optopt);
<a name="l00074"></a>00074 <span class="keywordflow">return</span> (BADCH);
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 <span class="keywordflow">if</span> (*++oli != <span class="charliteral">':'</span>) { <span class="comment">/* don't need argument */</span>
<a name="l00077"></a>00077 optarg = NULL;
<a name="l00078"></a>00078 <span class="keywordflow">if</span> (!*place)
<a name="l00079"></a>00079 ++optind;
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081 <span class="keywordflow">else</span> { <span class="comment">/* need an argument */</span>
<a name="l00082"></a>00082 <span class="keywordflow">if</span> (*place) <span class="comment">/* no white space */</span>
<a name="l00083"></a>00083 optarg = place;
<a name="l00084"></a>00084 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (nargc <= ++optind) { <span class="comment">/* no arg */</span>
<a name="l00085"></a>00085 place = EMSG;
<a name="l00086"></a>00086 <span class="keywordflow">if</span> (*ostr == <span class="charliteral">':'</span>)
<a name="l00087"></a>00087 <span class="keywordflow">return</span> (BADARG);
<a name="l00088"></a>00088 <span class="keywordflow">if</span> (opterr)
<a name="l00089"></a>00089 (void)fprintf(stderr,
<a name="l00090"></a>00090 <span class="comment">// "%s: option requires an argument -- %c\n",</span>
<a name="l00091"></a>00091 <span class="comment">// __progname, optopt);</span>
<a name="l00092"></a>00092 <span class="stringliteral">"option requires an argument -- %c\n"</span>,
<a name="l00093"></a>00093 optopt);
<a name="l00094"></a>00094 <span class="keywordflow">return</span> (BADCH);
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096 <span class="keywordflow">else</span> <span class="comment">/* white space */</span>
<a name="l00097"></a>00097 optarg = nargv[optind];
<a name="l00098"></a>00098 place = EMSG;
<a name="l00099"></a>00099 ++optind;
<a name="l00100"></a>00100 }
<a name="l00101"></a>00101 <span class="keywordflow">return</span> (optopt); <span class="comment">/* dump back option letter */</span>
<a name="l00102"></a>00102 }
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