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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>YAJL: example/parse_config.c</title>
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<div id="projectname">YAJL
 <span id="projectnumber">2.1.0</span>
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<div class="title">example/parse_config.c</div> </div>
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<div class="contents">
<div class="fragment"><div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io></span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Permission to use, copy, modify, and/or distribute this software for any</span></div>
<div class="line"><span class="comment"> * purpose with or without fee is hereby granted, provided that the above</span></div>
<div class="line"><span class="comment"> * copyright notice and this permission notice appear in all copies.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES</span></div>
<div class="line"><span class="comment"> * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF</span></div>
<div class="line"><span class="comment"> * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR</span></div>
<div class="line"><span class="comment"> * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES</span></div>
<div class="line"><span class="comment"> * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN</span></div>
<div class="line"><span class="comment"> * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF</span></div>
<div class="line"><span class="comment"> * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><span class="preprocessor">#include <string.h></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include "yajl/yajl_tree.h"</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> fileData[65536];</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span></div>
<div class="line">main(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordtype">size_t</span> rd;</div>
<div class="line"> <a name="_a0"></a><a class="code" href="structyajl__val__s.html">yajl_val</a> node;</div>
<div class="line"> <span class="keywordtype">char</span> errbuf[1024];</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* null plug buffers */</span></div>
<div class="line"> fileData[0] = errbuf[0] = 0;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* read the entire config file */</span></div>
<div class="line"> rd = fread((<span class="keywordtype">void</span> *) fileData, 1, <span class="keyword">sizeof</span>(fileData) - 1, stdin);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* file read error handling */</span></div>
<div class="line"> <span class="keywordflow">if</span> (rd == 0 && !feof(stdin)) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"error encountered on file read\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (rd >= <span class="keyword">sizeof</span>(fileData) - 1) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"config file too big\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* we have the whole config file in memory. let's parse it ... */</span></div>
<div class="line"> node = <a name="a1"></a><a class="code" href="yajl__tree_8h.html#a6a04342e825859a3e9d52df93e9d112a">yajl_tree_parse</a>((<span class="keyword">const</span> <span class="keywordtype">char</span> *) fileData, errbuf, <span class="keyword">sizeof</span>(errbuf));</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* parse error handling */</span></div>
<div class="line"> <span class="keywordflow">if</span> (node == NULL) {</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"parse_error: "</span>);</div>
<div class="line"> <span class="keywordflow">if</span> (strlen(errbuf)) fprintf(stderr, <span class="stringliteral">" %s"</span>, errbuf);</div>
<div class="line"> <span class="keywordflow">else</span> fprintf(stderr, <span class="stringliteral">"unknown error"</span>);</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"\n"</span>);</div>
<div class="line"> <span class="keywordflow">return</span> 1;</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* ... and extract a nested value from the config file */</span></div>
<div class="line"> {</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> * path[] = { <span class="stringliteral">"Logging"</span>, <span class="stringliteral">"timeFormat"</span>, (<span class="keyword">const</span> <span class="keywordtype">char</span> *) 0 };</div>
<div class="line"> <a class="code" href="structyajl__val__s.html">yajl_val</a> v = <a name="a2"></a><a class="code" href="yajl__tree_8h.html#a534c427581fac81ee828c28367dbe90d">yajl_tree_get</a>(node, path, <a name="a3"></a><a class="code" href="yajl__tree_8h.html#ae95a1d5a195e8bd22a96f69cbf4e7c91a8e1c9361f16919197409a226dcad7c65">yajl_t_string</a>);</div>
<div class="line"> <span class="keywordflow">if</span> (v) printf(<span class="stringliteral">"%s/%s: %s\n"</span>, path[0], path[1], <a name="a4"></a><a class="code" href="yajl__tree_8h.html#a2fe1773db524ee1efdad7eb97ce12c18">YAJL_GET_STRING</a>(v));</div>
<div class="line"> <span class="keywordflow">else</span> printf(<span class="stringliteral">"no such node: %s/%s\n"</span>, path[0], path[1]);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <a name="a5"></a><a class="code" href="yajl__tree_8h.html#a83b59f411e80404aad35ae7071c4ecf8">yajl_tree_free</a>(node);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
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