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<h1>buf.c</h1><div class="fragment"><pre class="fragment">00001 <span class="comment">/* </span>
00002 <span class="comment"> * Copyright (c) 2005, 2006 by KoanLogic s.r.l. - All rights reserved.  </span>
00003 <span class="comment"> */</span>
00004 
00005 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> rcsid[] =
00006     <span class="stringliteral">"$Id: buf.c,v 1.1 2006/05/28 15:39:43 tat Exp $"</span>;
00007 
00008 <span class="preprocessor">#include &lt;sys/types.h&gt;</span>
00009 <span class="preprocessor">#include &lt;sys/stat.h&gt;</span>
00010 <span class="preprocessor">#include &lt;unistd.h&gt;</span>
00011 <span class="preprocessor">#include &lt;u/libu.h&gt;</span>
00012 <span class="preprocessor">#include &lt;u/buf.h&gt;</span>
00013 
00014 <span class="keyword">struct </span>u_buf_s
00015 {
00016     <span class="keywordtype">char</span> *data;
00017     size_t size, len;
00018 };
00019 
<a name="l00035"></a><a class="code" href="group__string.html#ga2">00035</a> <span class="keywordtype">int</span> <a class="code" href="group__string.html#ga2">u_buf_reserve</a>(u_buf_t *ubuf, size_t size)
00036 {
00037     <span class="keywordtype">char</span> *nbuf;
00038 
00039     dbg_err_if(ubuf == NULL);
00040 
00041     <span class="keywordflow">if</span>(size &lt;= ubuf-&gt;size)
00042         <span class="keywordflow">return</span> 0; <span class="comment">/* nothing to do */</span>
00043    
00044     <span class="comment">/* size plus 1 char to store a '\0' */</span>
00045     nbuf = <a class="code" href="group__alloc.html#ga3">u_realloc</a>(ubuf-&gt;data, size+1);
00046     dbg_err_if(nbuf == NULL);
00047 
00048     <span class="comment">/* buffer data will always be zero-terminated (but the len field will not</span>
00049 <span class="comment">     * count the last '\0') */</span>
00050     nbuf[size] = 0;
00051 
00052     ubuf-&gt;data = (<span class="keywordtype">void</span>*)nbuf;
00053     ubuf-&gt;size = size;
00054 
00055     <span class="keywordflow">return</span> 0;
00056 err:
00057     <span class="keywordflow">return</span> ~0;
00058 }
00059 
<a name="l00072"></a><a class="code" href="group__string.html#ga3">00072</a> <span class="keywordtype">int</span> <a class="code" href="group__string.html#ga3">u_buf_append</a>(u_buf_t *ubuf, <span class="keywordtype">void</span> *data, size_t size)
00073 {
00074     dbg_err_if(ubuf == NULL);
00075     dbg_err_if(data == NULL);
00076     dbg_err_if(size == 0);
00077 
00078     <span class="keywordflow">if</span>(ubuf-&gt;size - ubuf-&gt;len &lt; size)
00079     {   <span class="comment">/* buffer too small, need to resize */</span>
00080         dbg_err_if(<a class="code" href="group__string.html#ga2">u_buf_reserve</a>(ubuf, ubuf-&gt;size + ubuf-&gt;len + 2*size));
00081     }
00082    
00083     memcpy(ubuf-&gt;data + ubuf-&gt;len, data, size);
00084     ubuf-&gt;len += size;
00085 
00086     <span class="comment">/* zero term the buffer so it can be used (when applicable) as a string */</span>
00087     ubuf-&gt;data[ubuf-&gt;len] = 0;
00088 
00089     <span class="keywordflow">return</span> 0;
00090 err:
00091     <span class="keywordflow">return</span> ~0;
00092 }
00093 
<a name="l00104"></a><a class="code" href="group__string.html#ga4">00104</a> <span class="keywordtype">int</span> <a class="code" href="group__string.html#ga4">u_buf_load</a>(u_buf_t *ubuf, <span class="keywordtype">char</span> *filename)
00105 {
00106     <span class="keyword">enum</span> { BUFSZ = 4096 };
00107     <span class="keyword">struct </span>stat st;
00108     <span class="keywordtype">char</span> buf[BUFSZ];
00109     FILE *fp = NULL;
00110 
00111     dbg_err_if(ubuf == NULL);
00112     dbg_err_if(filename == NULL);
00113 
00114     dbg_err_if(stat(filename, &amp;st));
00115 
00116     <span class="comment">/* clear the current data */</span>
00117     dbg_err_if(<a class="code" href="group__string.html#ga8">u_buf_clear</a>(ubuf));
00118 
00119     <span class="comment">/* be sure to have a big enough buffer */</span>
00120     dbg_err_if(<a class="code" href="group__string.html#ga2">u_buf_reserve</a>(ubuf, st.st_size));
00121 
00122     warn_err_sif((fp = fopen(filename, <span class="stringliteral">"r"</span>)) == NULL);
00123 
00124     <span class="comment">/* fill the buffer with the whole file content */</span>
00125     dbg_err_if(fread(ubuf-&gt;data, st.st_size, 1, fp) == 0);
00126     ubuf-&gt;len = st.st_size;
00127 
00128     fclose(fp);
00129 
00130     <span class="keywordflow">return</span> 0;
00131 err:
00132     <span class="keywordflow">if</span>(fp)
00133         fclose(fp);
00134     <span class="keywordflow">return</span> ~0;
00135 }
00136 
<a name="l00151"></a><a class="code" href="group__string.html#ga5">00151</a> <span class="keywordtype">int</span> <a class="code" href="group__string.html#ga5">u_buf_detach</a>(u_buf_t *ubuf)
00152 {
00153     dbg_err_if(ubuf == NULL);
00154 
00155     ubuf-&gt;data = NULL;
00156     ubuf-&gt;size = 0;
00157     ubuf-&gt;len = 0;
00158 
00159     <span class="keywordflow">return</span> 0;
00160 err:
00161     <span class="keywordflow">return</span> ~0;
00162 }
00163 
<a name="l00173"></a><a class="code" href="group__string.html#ga6">00173</a> size_t <a class="code" href="group__string.html#ga6">u_buf_size</a>(u_buf_t *ubuf)
00174 {
00175     dbg_err_if(ubuf == NULL);
00176 
00177     <span class="keywordflow">return</span> ubuf-&gt;size;
00178 err:
00179     <span class="keywordflow">return</span> 0;
00180 }
00181 
<a name="l00191"></a><a class="code" href="group__string.html#ga7">00191</a> size_t <a class="code" href="group__string.html#ga7">u_buf_len</a>(u_buf_t *ubuf)
00192 {
00193     dbg_err_if(ubuf == NULL);
00194 
00195     <span class="keywordflow">return</span> ubuf-&gt;len;
00196 err:
00197     <span class="keywordflow">return</span> 0;
00198 }
00199 
<a name="l00210"></a><a class="code" href="group__string.html#ga8">00210</a> <span class="keywordtype">int</span> <a class="code" href="group__string.html#ga8">u_buf_clear</a>(u_buf_t *ubuf)
00211 {
00212     dbg_err_if(ubuf == NULL);
00213     
00214     ubuf-&gt;len = 0;
00215 
00216     <span class="keywordflow">return</span> 0;
00217 err:
00218     <span class="keywordflow">return</span> ~0;
00219 }
00220 
<a name="l00233"></a><a class="code" href="group__string.html#ga9">00233</a> <span class="keywordtype">int</span> <a class="code" href="group__string.html#ga9">u_buf_set</a>(u_buf_t *ubuf, <span class="keywordtype">void</span> *data, size_t size)
00234 {
00235     dbg_err_if(ubuf == NULL);
00236     dbg_err_if(data == NULL);
00237     dbg_err_if(size == 0);
00238 
00239     dbg_err_if(<a class="code" href="group__string.html#ga8">u_buf_clear</a>(ubuf));
00240 
00241     dbg_err_if(<a class="code" href="group__string.html#ga3">u_buf_append</a>(ubuf, data, size));
00242 
00243     <span class="keywordflow">return</span> 0;
00244 err:
00245     <span class="keywordflow">return</span> ~0;
00246 }
00247 
<a name="l00257"></a><a class="code" href="group__string.html#ga10">00257</a> <span class="keywordtype">void</span>* <a class="code" href="group__string.html#ga10">u_buf_ptr</a>(u_buf_t *ubuf)
00258 {
00259     dbg_err_if(ubuf == NULL);
00260     
00261     <span class="keywordflow">return</span> ubuf-&gt;data;
00262 err:
00263     <span class="keywordflow">return</span> NULL;
00264 }
00265 
<a name="l00275"></a><a class="code" href="group__string.html#ga11">00275</a> <span class="keywordtype">int</span> <a class="code" href="group__string.html#ga11">u_buf_free</a>(u_buf_t *ubuf)
00276 {
00277     dbg_err_if(ubuf == NULL);
00278 
00279     <span class="keywordflow">if</span>(ubuf-&gt;data)
00280         <a class="code" href="group__alloc.html#ga4">u_free</a>(ubuf-&gt;data);
00281 
00282     <span class="keywordflow">return</span> 0;
00283 err:
00284     <span class="keywordflow">return</span> ~0;
00285 }
00286 
<a name="l00296"></a><a class="code" href="group__string.html#ga12">00296</a> <span class="keywordtype">int</span> <a class="code" href="group__string.html#ga12">u_buf_create</a>(u_buf_t **pubuf)
00297 {
00298     u_buf_t *ubuf = NULL;
00299 
00300     dbg_err_if(pubuf == NULL);
00301 
00302     ubuf = (u_buf_t*)<a class="code" href="group__alloc.html#ga2">u_zalloc</a>(<span class="keyword">sizeof</span>(u_buf_t));
00303     dbg_err_if(ubuf == NULL);
00304 
00305     *pubuf = ubuf;
00306 
00307     <span class="keywordflow">return</span> 0;
00308 err:
00309     <span class="keywordflow">return</span> ~0;
00310 }
00311 
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