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<h1>lib/data.c</h1> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * lib/data.c Abstract Data</span>
<a name="l00003"></a>00003 <span class="comment"> *</span>
<a name="l00004"></a>00004 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
<a name="l00005"></a>00005 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00006"></a>00006 <span class="comment"> * License as published by the Free Software Foundation version 2.1</span>
<a name="l00007"></a>00007 <span class="comment"> * of the License.</span>
<a name="l00008"></a>00008 <span class="comment"> *</span>
<a name="l00009"></a>00009 <span class="comment"> * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch></span>
<a name="l00010"></a>00010 <span class="comment"> */</span>
<a name="l00011"></a>00011 <span class="comment"></span>
<a name="l00012"></a>00012 <span class="comment">/**</span>
<a name="l00013"></a>00013 <span class="comment"> * @ingroup utils</span>
<a name="l00014"></a>00014 <span class="comment"> * @defgroup data Abstract Data</span>
<a name="l00015"></a>00015 <span class="comment"> * @{</span>
<a name="l00016"></a>00016 <span class="comment"> */</span>
<a name="l00017"></a>00017
<a name="l00018"></a>00018 <span class="preprocessor">#include <netlink-local.h></span>
<a name="l00019"></a>00019 <span class="preprocessor">#include <netlink/netlink.h></span>
<a name="l00020"></a>00020 <span class="preprocessor">#include <netlink/utils.h></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <linux/socket.h></span>
<a name="l00022"></a>00022 <span class="comment"></span>
<a name="l00023"></a>00023 <span class="comment">/**</span>
<a name="l00024"></a>00024 <span class="comment"> * @name General</span>
<a name="l00025"></a>00025 <span class="comment"> * @{</span>
<a name="l00026"></a>00026 <span class="comment"> */</span>
<a name="l00027"></a>00027 <span class="comment"></span>
<a name="l00028"></a>00028 <span class="comment">/**</span>
<a name="l00029"></a>00029 <span class="comment"> * Allocate a new abstract data object.</span>
<a name="l00030"></a>00030 <span class="comment"> * @arg buf Data buffer containing the actual data.</span>
<a name="l00031"></a>00031 <span class="comment"> * @arg size Size of data buffer.</span>
<a name="l00032"></a>00032 <span class="comment"> *</span>
<a name="l00033"></a>00033 <span class="comment"> * Allocates a new abstract data and copies the specified data</span>
<a name="l00034"></a>00034 <span class="comment"> * buffer into the new handle.</span>
<a name="l00035"></a>00035 <span class="comment"> * </span>
<a name="l00036"></a>00036 <span class="comment"> * @return Newly allocated data handle or NULL</span>
<a name="l00037"></a>00037 <span class="comment"> */</span>
<a name="l00038"></a><a class="code" href="group__data.html#gafd58c229c0e4dd4dcea07c8d8493c144">00038</a> <span class="keyword">struct </span>nl_data *<a class="code" href="group__data.html#gafd58c229c0e4dd4dcea07c8d8493c144" title="Allocate a new abstract data object.">nl_data_alloc</a>(<span class="keywordtype">void</span> *buf, <span class="keywordtype">size_t</span> size)
<a name="l00039"></a>00039 {
<a name="l00040"></a>00040 <span class="keyword">struct </span>nl_data *data;
<a name="l00041"></a>00041
<a name="l00042"></a>00042 data = calloc(1, <span class="keyword">sizeof</span>(*data));
<a name="l00043"></a>00043 <span class="keywordflow">if</span> (!data)
<a name="l00044"></a>00044 <span class="keywordflow">goto</span> errout;
<a name="l00045"></a>00045
<a name="l00046"></a>00046 data->d_data = calloc(1, size);
<a name="l00047"></a>00047 <span class="keywordflow">if</span> (!data->d_data) {
<a name="l00048"></a>00048 free(data);
<a name="l00049"></a>00049 <span class="keywordflow">goto</span> errout;
<a name="l00050"></a>00050 }
<a name="l00051"></a>00051
<a name="l00052"></a>00052 data->d_size = size;
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keywordflow">if</span> (buf)
<a name="l00055"></a>00055 memcpy(data->d_data, buf, size);
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="keywordflow">return</span> data;
<a name="l00058"></a>00058 errout:
<a name="l00059"></a>00059 nl_errno(ENOMEM);
<a name="l00060"></a>00060 <span class="keywordflow">return</span> NULL;
<a name="l00061"></a>00061 }
<a name="l00062"></a>00062 <span class="comment"></span>
<a name="l00063"></a>00063 <span class="comment">/**</span>
<a name="l00064"></a>00064 <span class="comment"> * Clone an abstract data object.</span>
<a name="l00065"></a>00065 <span class="comment"> * @arg src Abstract data object</span>
<a name="l00066"></a>00066 <span class="comment"> *</span>
<a name="l00067"></a>00067 <span class="comment"> * @return Cloned object or NULL</span>
<a name="l00068"></a>00068 <span class="comment"> */</span>
<a name="l00069"></a><a class="code" href="group__data.html#ga64967fcb4916f66a2bd1a82292350e74">00069</a> <span class="keyword">struct </span>nl_data *<a class="code" href="group__data.html#ga64967fcb4916f66a2bd1a82292350e74" title="Clone an abstract data object.">nl_data_clone</a>(<span class="keyword">struct</span> nl_data *src)
<a name="l00070"></a>00070 {
<a name="l00071"></a>00071 <span class="keywordflow">return</span> <a class="code" href="group__data.html#gafd58c229c0e4dd4dcea07c8d8493c144" title="Allocate a new abstract data object.">nl_data_alloc</a>(src->d_data, src->d_size);
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073 <span class="comment"></span>
<a name="l00074"></a>00074 <span class="comment">/**</span>
<a name="l00075"></a>00075 <span class="comment"> * Append data to an abstract data object.</span>
<a name="l00076"></a>00076 <span class="comment"> * @arg data Abstract data object.</span>
<a name="l00077"></a>00077 <span class="comment"> * @arg buf Data buffer containing the data to be appended.</span>
<a name="l00078"></a>00078 <span class="comment"> * @arg size Size of data to be apppended.</span>
<a name="l00079"></a>00079 <span class="comment"> *</span>
<a name="l00080"></a>00080 <span class="comment"> * Reallocates an abstract data and copies the specified data</span>
<a name="l00081"></a>00081 <span class="comment"> * buffer into the new handle.</span>
<a name="l00082"></a>00082 <span class="comment"> * </span>
<a name="l00083"></a>00083 <span class="comment"> * @return 0 on success or a negative error code</span>
<a name="l00084"></a>00084 <span class="comment"> */</span>
<a name="l00085"></a><a class="code" href="group__data.html#ga81b8ad4a0fd04f8d80bafecc323f2a35">00085</a> <span class="keywordtype">int</span> <a class="code" href="group__data.html#ga81b8ad4a0fd04f8d80bafecc323f2a35" title="Append data to an abstract data object.">nl_data_append</a>(<span class="keyword">struct</span> nl_data *data, <span class="keywordtype">void</span> *buf, <span class="keywordtype">size_t</span> size)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087 <span class="keywordflow">if</span> (size < 0)
<a name="l00088"></a>00088 BUG();
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="keywordflow">if</span> (size > 0) {
<a name="l00091"></a>00091 data->d_data = realloc(data->d_data, data->d_size + size);
<a name="l00092"></a>00092 <span class="keywordflow">if</span> (!data->d_data)
<a name="l00093"></a>00093 <span class="keywordflow">return</span> nl_errno(ENOMEM);
<a name="l00094"></a>00094
<a name="l00095"></a>00095 <span class="keywordflow">if</span> (buf)
<a name="l00096"></a>00096 memcpy(data->d_data + data->d_size, buf, size);
<a name="l00097"></a>00097 <span class="keywordflow">else</span>
<a name="l00098"></a>00098 memset(data->d_data + data->d_size, 0, size);
<a name="l00099"></a>00099
<a name="l00100"></a>00100 data->d_size += size;
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="keywordflow">return</span> 0;
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105 <span class="comment"></span>
<a name="l00106"></a>00106 <span class="comment">/**</span>
<a name="l00107"></a>00107 <span class="comment"> * Free an abstract data object.</span>
<a name="l00108"></a>00108 <span class="comment"> * @arg data Abstract data object.</span>
<a name="l00109"></a>00109 <span class="comment"> */</span>
<a name="l00110"></a><a class="code" href="group__data.html#ga35cbd02038e7abf0be6da4cb2a34189e">00110</a> <span class="keywordtype">void</span> <a class="code" href="group__data.html#ga35cbd02038e7abf0be6da4cb2a34189e" title="Free an abstract data object.">nl_data_free</a>(<span class="keyword">struct</span> nl_data *data)
<a name="l00111"></a>00111 {
<a name="l00112"></a>00112 <span class="keywordflow">if</span> (data)
<a name="l00113"></a>00113 free(data->d_data);
<a name="l00114"></a>00114
<a name="l00115"></a>00115 free(data);
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117 <span class="comment"></span>
<a name="l00118"></a>00118 <span class="comment">/** @} */</span>
<a name="l00119"></a>00119 <span class="comment"></span>
<a name="l00120"></a>00120 <span class="comment">/**</span>
<a name="l00121"></a>00121 <span class="comment"> * @name Attribute Access</span>
<a name="l00122"></a>00122 <span class="comment"> * @{</span>
<a name="l00123"></a>00123 <span class="comment"> */</span>
<a name="l00124"></a>00124 <span class="comment"></span>
<a name="l00125"></a>00125 <span class="comment">/**</span>
<a name="l00126"></a>00126 <span class="comment"> * Get data buffer of abstract data object.</span>
<a name="l00127"></a>00127 <span class="comment"> * @arg data Abstract data object.</span>
<a name="l00128"></a>00128 <span class="comment"> * @return Data buffer or NULL if empty.</span>
<a name="l00129"></a>00129 <span class="comment"> */</span>
<a name="l00130"></a><a class="code" href="group__data.html#ga1ca4b5ea3a92643c2fe94dd4eeef072b">00130</a> <span class="keywordtype">void</span> *<a class="code" href="group__data.html#ga1ca4b5ea3a92643c2fe94dd4eeef072b" title="Get data buffer of abstract data object.">nl_data_get</a>(<span class="keyword">struct</span> nl_data *data)
<a name="l00131"></a>00131 {
<a name="l00132"></a>00132 <span class="keywordflow">return</span> data->d_size > 0 ? data->d_data : NULL;
<a name="l00133"></a>00133 }
<a name="l00134"></a>00134 <span class="comment"></span>
<a name="l00135"></a>00135 <span class="comment">/**</span>
<a name="l00136"></a>00136 <span class="comment"> * Get size of data buffer of abstract data object.</span>
<a name="l00137"></a>00137 <span class="comment"> * @arg data Abstract data object.</span>
<a name="l00138"></a>00138 <span class="comment"> * @return Size of data buffer.</span>
<a name="l00139"></a>00139 <span class="comment"> */</span>
<a name="l00140"></a><a class="code" href="group__data.html#ga6dbaf24a42f29514e30665c9e42a3d1c">00140</a> <span class="keywordtype">size_t</span> <a class="code" href="group__data.html#ga6dbaf24a42f29514e30665c9e42a3d1c" title="Get size of data buffer of abstract data object.">nl_data_get_size</a>(<span class="keyword">struct</span> nl_data *data)
<a name="l00141"></a>00141 {
<a name="l00142"></a>00142 <span class="keywordflow">return</span> data->d_size;
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 <span class="comment"></span>
<a name="l00145"></a>00145 <span class="comment">/** @} */</span>
<a name="l00146"></a>00146 <span class="comment"></span>
<a name="l00147"></a>00147 <span class="comment">/**</span>
<a name="l00148"></a>00148 <span class="comment"> * @name Misc</span>
<a name="l00149"></a>00149 <span class="comment"> * @{</span>
<a name="l00150"></a>00150 <span class="comment"> */</span>
<a name="l00151"></a>00151 <span class="comment"></span>
<a name="l00152"></a>00152 <span class="comment">/**</span>
<a name="l00153"></a>00153 <span class="comment"> * Compare two abstract data objects.</span>
<a name="l00154"></a>00154 <span class="comment"> * @arg a Abstract data object.</span>
<a name="l00155"></a>00155 <span class="comment"> * @arg b Another abstract data object.</span>
<a name="l00156"></a>00156 <span class="comment"> * @return An integer less than, equal to, or greater than zero if</span>
<a name="l00157"></a>00157 <span class="comment"> * a is found, respectively, to be less than, to match, or</span>
<a name="l00158"></a>00158 <span class="comment"> * be greater than b.</span>
<a name="l00159"></a>00159 <span class="comment"> */</span>
<a name="l00160"></a><a class="code" href="group__data.html#ga232b75513b2aa66e91d5eb51e2a22b12">00160</a> <span class="keywordtype">int</span> <a class="code" href="group__data.html#ga232b75513b2aa66e91d5eb51e2a22b12" title="Compare two abstract data objects.">nl_data_cmp</a>(<span class="keyword">struct</span> nl_data *a, <span class="keyword">struct</span> nl_data *b)
<a name="l00161"></a>00161 {
<a name="l00162"></a>00162 <span class="keywordtype">void</span> *a_ = <a class="code" href="group__data.html#ga1ca4b5ea3a92643c2fe94dd4eeef072b" title="Get data buffer of abstract data object.">nl_data_get</a>(a);
<a name="l00163"></a>00163 <span class="keywordtype">void</span> *b_ = <a class="code" href="group__data.html#ga1ca4b5ea3a92643c2fe94dd4eeef072b" title="Get data buffer of abstract data object.">nl_data_get</a>(b);
<a name="l00164"></a>00164
<a name="l00165"></a>00165 <span class="keywordflow">if</span> (a_ && b_)
<a name="l00166"></a>00166 <span class="keywordflow">return</span> memcmp(a_, b_, <a class="code" href="group__data.html#ga6dbaf24a42f29514e30665c9e42a3d1c" title="Get size of data buffer of abstract data object.">nl_data_get_size</a>(a));
<a name="l00167"></a>00167 <span class="keywordflow">else</span>
<a name="l00168"></a>00168 <span class="keywordflow">return</span> -1;
<a name="l00169"></a>00169 }
<a name="l00170"></a>00170 <span class="comment"></span>
<a name="l00171"></a>00171 <span class="comment">/** @} */</span><span class="comment"></span>
<a name="l00172"></a>00172 <span class="comment">/** @} */</span>
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