<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> <title>ldns documentation</title> <link href="doxygen.css" rel="stylesheet" type="text/css"> <link href="tabs.css" rel="stylesheet" type="text/css"> </head><body> <div class="logo"> <img src="LogoInGradientBar2-y100.png"/> </div> <!-- Generated by Doxygen 1.7.4 --> <div id="navrow1" class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> <li><a href="dirs.html"><span>Directories</span></a></li> </ul> </div> <div id="navrow2" class="tabs2"> <ul class="tablist"> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>Globals</span></a></li> </ul> </div> <div class="header"> <div class="headertitle"> <div class="title">buffer.c</div> </div> </div> <div class="contents"> <a href="buffer_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span> <a name="l00002"></a>00002 <span class="comment"> * buffer.c -- generic memory buffer .</span> <a name="l00003"></a>00003 <span class="comment"> *</span> <a name="l00004"></a>00004 <span class="comment"> * Copyright (c) 2001-2008, NLnet Labs. All rights reserved.</span> <a name="l00005"></a>00005 <span class="comment"> *</span> <a name="l00006"></a>00006 <span class="comment"> * See LICENSE for the license.</span> <a name="l00007"></a>00007 <span class="comment"> *</span> <a name="l00008"></a>00008 <span class="comment"> */</span> <a name="l00009"></a>00009 <a name="l00010"></a>00010 <span class="preprocessor">#include <<a class="code" href="ldns_2config_8h.html">ldns/config.h</a>></span> <a name="l00011"></a>00011 <a name="l00012"></a>00012 <span class="preprocessor">#include <<a class="code" href="ldns_8h.html" title="Including this file will include all ldns files, and define some lookup tables.">ldns/ldns.h</a>></span> <a name="l00013"></a>00013 <span class="preprocessor">#include <<a class="code" href="buffer_8h.html" title="This file contains the definition of ldns_buffer, and functions to manipulate those.">ldns/buffer.h</a>></span> <a name="l00014"></a>00014 <a name="l00015"></a>00015 <a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> * <a name="l00016"></a><a class="code" href="buffer_8h.html#ac6d413e9a76bf7e7c2022f13e36b9900">00016</a> <a class="code" href="buffer_8c.html#ac6d413e9a76bf7e7c2022f13e36b9900" title="creates a new buffer with the specified capacity.">ldns_buffer_new</a>(<span class="keywordtype">size_t</span> capacity) <a name="l00017"></a>00017 { <a name="l00018"></a>00018 <a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> *buffer = <a class="code" href="util_8h.html#a828619b138fdeb9756cd3c874d0551c1" title="Memory management macros.">LDNS_MALLOC</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a>); <a name="l00019"></a>00019 <a name="l00020"></a>00020 <span class="keywordflow">if</span> (!buffer) { <a name="l00021"></a>00021 <span class="keywordflow">return</span> NULL; <a name="l00022"></a>00022 } <a name="l00023"></a>00023 <a name="l00024"></a>00024 buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a> = (uint8_t *) <a class="code" href="util_8h.html#aaad6949daea3c6cefd01d19300f6e21a">LDNS_XMALLOC</a>(uint8_t, capacity); <a name="l00025"></a>00025 <span class="keywordflow">if</span> (!buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a>) { <a name="l00026"></a>00026 <a class="code" href="util_8h.html#a5e13054aa9b3843e97514228a0bbe909">LDNS_FREE</a>(buffer); <a name="l00027"></a>00027 <span class="keywordflow">return</span> NULL; <a name="l00028"></a>00028 } <a name="l00029"></a>00029 <a name="l00030"></a>00030 buffer-><a class="code" href="structldns__struct__buffer.html#ac62e89526e2292f430cb815620ee2ebb" title="The current position used for reading/writing.">_position</a> = 0; <a name="l00031"></a>00031 buffer-><a class="code" href="structldns__struct__buffer.html#af6eb085e24852584020b4bc5459d4cf5" title="The read/write limit.">_limit</a> = buffer-><a class="code" href="structldns__struct__buffer.html#a0e2253a51f3cfb0a8c8b23d288861326" title="The amount of data the buffer can contain.">_capacity</a> = capacity; <a name="l00032"></a>00032 buffer-><a class="code" href="structldns__struct__buffer.html#a67628b76dc8f1e174fa5667e2543bf4a" title="If the buffer is fixed it cannot be resized.">_fixed</a> = 0; <a name="l00033"></a>00033 buffer-><a class="code" href="structldns__struct__buffer.html#ad19d973074968b399a74f32b6402c05c" title="The current state of the buffer.">_status</a> = <a class="code" href="error_8h.html#a11f34802bb1624af46054952e3b853afac58492ee3fc8d23f33c79824ed08c465">LDNS_STATUS_OK</a>; <a name="l00034"></a>00034 <a name="l00035"></a>00035 ldns_buffer_invariant(buffer); <a name="l00036"></a>00036 <a name="l00037"></a>00037 <span class="keywordflow">return</span> buffer; <a name="l00038"></a>00038 } <a name="l00039"></a>00039 <a name="l00040"></a>00040 <span class="keywordtype">void</span> <a name="l00041"></a><a class="code" href="buffer_8h.html#a7f33a4c147914739da73ccc4caa2bd7f">00041</a> <a class="code" href="buffer_8c.html#a7f33a4c147914739da73ccc4caa2bd7f" title="creates a buffer with the specified data.">ldns_buffer_new_frm_data</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> *buffer, <span class="keywordtype">void</span> *data, <span class="keywordtype">size_t</span> size) <a name="l00042"></a>00042 { <a name="l00043"></a>00043 assert(data != NULL); <a name="l00044"></a>00044 <a name="l00045"></a>00045 buffer-><a class="code" href="structldns__struct__buffer.html#ac62e89526e2292f430cb815620ee2ebb" title="The current position used for reading/writing.">_position</a> = 0; <a name="l00046"></a>00046 buffer-><a class="code" href="structldns__struct__buffer.html#af6eb085e24852584020b4bc5459d4cf5" title="The read/write limit.">_limit</a> = buffer-><a class="code" href="structldns__struct__buffer.html#a0e2253a51f3cfb0a8c8b23d288861326" title="The amount of data the buffer can contain.">_capacity</a> = size; <a name="l00047"></a>00047 buffer-><a class="code" href="structldns__struct__buffer.html#a67628b76dc8f1e174fa5667e2543bf4a" title="If the buffer is fixed it cannot be resized.">_fixed</a> = 0; <a name="l00048"></a>00048 buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a> = <a class="code" href="util_8h.html#aaad6949daea3c6cefd01d19300f6e21a">LDNS_XMALLOC</a>(uint8_t, size); <a name="l00049"></a>00049 <span class="keywordflow">if</span>(!buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a>) { <a name="l00050"></a>00050 buffer-><a class="code" href="structldns__struct__buffer.html#ad19d973074968b399a74f32b6402c05c" title="The current state of the buffer.">_status</a> = <a class="code" href="error_8h.html#a11f34802bb1624af46054952e3b853afa81e80e66a14551db514726fa49290498">LDNS_STATUS_MEM_ERR</a>; <a name="l00051"></a>00051 <span class="keywordflow">return</span>; <a name="l00052"></a>00052 } <a name="l00053"></a>00053 memcpy(buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a>, data, size); <a name="l00054"></a>00054 buffer-><a class="code" href="structldns__struct__buffer.html#ad19d973074968b399a74f32b6402c05c" title="The current state of the buffer.">_status</a> = <a class="code" href="error_8h.html#a11f34802bb1624af46054952e3b853afac58492ee3fc8d23f33c79824ed08c465">LDNS_STATUS_OK</a>; <a name="l00055"></a>00055 <a name="l00056"></a>00056 ldns_buffer_invariant(buffer); <a name="l00057"></a>00057 } <a name="l00058"></a>00058 <a name="l00059"></a>00059 <span class="keywordtype">bool</span> <a name="l00060"></a><a class="code" href="buffer_8h.html#a4e16fc0b5f97c6a3d91533c93f8f47c2">00060</a> <a class="code" href="buffer_8c.html#a4e16fc0b5f97c6a3d91533c93f8f47c2" title="changes the buffer's capacity.">ldns_buffer_set_capacity</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> *buffer, <span class="keywordtype">size_t</span> capacity) <a name="l00061"></a>00061 { <a name="l00062"></a>00062 <span class="keywordtype">void</span> *data; <a name="l00063"></a>00063 <a name="l00064"></a>00064 ldns_buffer_invariant(buffer); <a name="l00065"></a>00065 assert(buffer-><a class="code" href="structldns__struct__buffer.html#ac62e89526e2292f430cb815620ee2ebb" title="The current position used for reading/writing.">_position</a> <= capacity); <a name="l00066"></a>00066 <a name="l00067"></a>00067 data = (uint8_t *) <a class="code" href="util_8h.html#aef91214266c90875fa06e4a47e734538">LDNS_XREALLOC</a>(buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a>, uint8_t, capacity); <a name="l00068"></a>00068 <span class="keywordflow">if</span> (!data) { <a name="l00069"></a>00069 buffer-><a class="code" href="structldns__struct__buffer.html#ad19d973074968b399a74f32b6402c05c" title="The current state of the buffer.">_status</a> = <a class="code" href="error_8h.html#a11f34802bb1624af46054952e3b853afa81e80e66a14551db514726fa49290498">LDNS_STATUS_MEM_ERR</a>; <a name="l00070"></a>00070 <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00071"></a>00071 } <span class="keywordflow">else</span> { <a name="l00072"></a>00072 buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a> = data; <a name="l00073"></a>00073 buffer-><a class="code" href="structldns__struct__buffer.html#af6eb085e24852584020b4bc5459d4cf5" title="The read/write limit.">_limit</a> = buffer-><a class="code" href="structldns__struct__buffer.html#a0e2253a51f3cfb0a8c8b23d288861326" title="The amount of data the buffer can contain.">_capacity</a> = capacity; <a name="l00074"></a>00074 <span class="keywordflow">return</span> <span class="keyword">true</span>; <a name="l00075"></a>00075 } <a name="l00076"></a>00076 } <a name="l00077"></a>00077 <a name="l00078"></a>00078 <span class="keywordtype">bool</span> <a name="l00079"></a><a class="code" href="buffer_8h.html#a8ba0bcb3201dae8d3e563ed201decc7c">00079</a> <a class="code" href="buffer_8c.html#a8ba0bcb3201dae8d3e563ed201decc7c" title="ensures BUFFER can contain at least AMOUNT more bytes.">ldns_buffer_reserve</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> *buffer, <span class="keywordtype">size_t</span> amount) <a name="l00080"></a>00080 { <a name="l00081"></a>00081 ldns_buffer_invariant(buffer); <a name="l00082"></a>00082 assert(!buffer-><a class="code" href="structldns__struct__buffer.html#a67628b76dc8f1e174fa5667e2543bf4a" title="If the buffer is fixed it cannot be resized.">_fixed</a>); <a name="l00083"></a>00083 <span class="keywordflow">if</span> (buffer-><a class="code" href="structldns__struct__buffer.html#a0e2253a51f3cfb0a8c8b23d288861326" title="The amount of data the buffer can contain.">_capacity</a> < buffer-><a class="code" href="structldns__struct__buffer.html#ac62e89526e2292f430cb815620ee2ebb" title="The current position used for reading/writing.">_position</a> + amount) { <a name="l00084"></a>00084 <span class="keywordtype">size_t</span> new_capacity = buffer-><a class="code" href="structldns__struct__buffer.html#a0e2253a51f3cfb0a8c8b23d288861326" title="The amount of data the buffer can contain.">_capacity</a> * 3 / 2; <a name="l00085"></a>00085 <a name="l00086"></a>00086 <span class="keywordflow">if</span> (new_capacity < buffer->_position + amount) { <a name="l00087"></a>00087 new_capacity = buffer-><a class="code" href="structldns__struct__buffer.html#ac62e89526e2292f430cb815620ee2ebb" title="The current position used for reading/writing.">_position</a> + amount; <a name="l00088"></a>00088 } <a name="l00089"></a>00089 <span class="keywordflow">if</span> (!<a class="code" href="buffer_8c.html#a4e16fc0b5f97c6a3d91533c93f8f47c2" title="changes the buffer's capacity.">ldns_buffer_set_capacity</a>(buffer, new_capacity)) { <a name="l00090"></a>00090 buffer-><a class="code" href="structldns__struct__buffer.html#ad19d973074968b399a74f32b6402c05c" title="The current state of the buffer.">_status</a> = <a class="code" href="error_8h.html#a11f34802bb1624af46054952e3b853afa81e80e66a14551db514726fa49290498">LDNS_STATUS_MEM_ERR</a>; <a name="l00091"></a>00091 <span class="keywordflow">return</span> <span class="keyword">false</span>; <a name="l00092"></a>00092 } <a name="l00093"></a>00093 } <a name="l00094"></a>00094 buffer-><a class="code" href="structldns__struct__buffer.html#af6eb085e24852584020b4bc5459d4cf5" title="The read/write limit.">_limit</a> = buffer-><a class="code" href="structldns__struct__buffer.html#a0e2253a51f3cfb0a8c8b23d288861326" title="The amount of data the buffer can contain.">_capacity</a>; <a name="l00095"></a>00095 <span class="keywordflow">return</span> <span class="keyword">true</span>; <a name="l00096"></a>00096 } <a name="l00097"></a>00097 <a name="l00098"></a>00098 <span class="keywordtype">int</span> <a name="l00099"></a><a class="code" href="buffer_8h.html#ad0bd2ed28633df90c9c99974eaae4b5a">00099</a> <a class="code" href="buffer_8c.html#ad0bd2ed28633df90c9c99974eaae4b5a" title="prints to the buffer, increasing the capacity if required using buffer_reserve().">ldns_buffer_printf</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> *buffer, <span class="keyword">const</span> <span class="keywordtype">char</span> *format, ...) <a name="l00100"></a>00100 { <a name="l00101"></a>00101 va_list args; <a name="l00102"></a>00102 <span class="keywordtype">int</span> written = 0; <a name="l00103"></a>00103 <span class="keywordtype">size_t</span> remaining; <a name="l00104"></a>00104 <a name="l00105"></a>00105 <span class="keywordflow">if</span> (ldns_buffer_status_ok(buffer)) { <a name="l00106"></a>00106 ldns_buffer_invariant(buffer); <a name="l00107"></a>00107 assert(buffer-><a class="code" href="structldns__struct__buffer.html#af6eb085e24852584020b4bc5459d4cf5" title="The read/write limit.">_limit</a> == buffer-><a class="code" href="structldns__struct__buffer.html#a0e2253a51f3cfb0a8c8b23d288861326" title="The amount of data the buffer can contain.">_capacity</a>); <a name="l00108"></a>00108 <a name="l00109"></a>00109 remaining = ldns_buffer_remaining(buffer); <a name="l00110"></a>00110 va_start(args, format); <a name="l00111"></a>00111 written = <a class="code" href="config_8h.html#a90f649eb9607cf5003051e74c60b39a6">vsnprintf</a>((<span class="keywordtype">char</span> *) ldns_buffer_current(buffer), remaining, <a name="l00112"></a>00112 format, args); <a name="l00113"></a>00113 va_end(args); <a name="l00114"></a>00114 <span class="keywordflow">if</span> (written == -1) { <a name="l00115"></a>00115 buffer-><a class="code" href="structldns__struct__buffer.html#ad19d973074968b399a74f32b6402c05c" title="The current state of the buffer.">_status</a> = <a class="code" href="error_8h.html#a11f34802bb1624af46054952e3b853afa9029a7994da0e2f27cff8848a6c6f9da">LDNS_STATUS_INTERNAL_ERR</a>; <a name="l00116"></a>00116 <span class="keywordflow">return</span> -1; <a name="l00117"></a>00117 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((<span class="keywordtype">size_t</span>) written >= remaining) { <a name="l00118"></a>00118 <span class="keywordflow">if</span> (!<a class="code" href="buffer_8c.html#a8ba0bcb3201dae8d3e563ed201decc7c" title="ensures BUFFER can contain at least AMOUNT more bytes.">ldns_buffer_reserve</a>(buffer, (<span class="keywordtype">size_t</span>) written + 1)) { <a name="l00119"></a>00119 buffer-><a class="code" href="structldns__struct__buffer.html#ad19d973074968b399a74f32b6402c05c" title="The current state of the buffer.">_status</a> = <a class="code" href="error_8h.html#a11f34802bb1624af46054952e3b853afa81e80e66a14551db514726fa49290498">LDNS_STATUS_MEM_ERR</a>; <a name="l00120"></a>00120 <span class="keywordflow">return</span> -1; <a name="l00121"></a>00121 } <a name="l00122"></a>00122 va_start(args, format); <a name="l00123"></a>00123 written = <a class="code" href="config_8h.html#a90f649eb9607cf5003051e74c60b39a6">vsnprintf</a>((<span class="keywordtype">char</span> *) ldns_buffer_current(buffer), <a name="l00124"></a>00124 ldns_buffer_remaining(buffer), format, args); <a name="l00125"></a>00125 va_end(args); <a name="l00126"></a>00126 <span class="keywordflow">if</span> (written == -1) { <a name="l00127"></a>00127 buffer-><a class="code" href="structldns__struct__buffer.html#ad19d973074968b399a74f32b6402c05c" title="The current state of the buffer.">_status</a> = <a class="code" href="error_8h.html#a11f34802bb1624af46054952e3b853afa9029a7994da0e2f27cff8848a6c6f9da">LDNS_STATUS_INTERNAL_ERR</a>; <a name="l00128"></a>00128 <span class="keywordflow">return</span> -1; <a name="l00129"></a>00129 } <a name="l00130"></a>00130 } <a name="l00131"></a>00131 buffer-><a class="code" href="structldns__struct__buffer.html#ac62e89526e2292f430cb815620ee2ebb" title="The current position used for reading/writing.">_position</a> += written; <a name="l00132"></a>00132 } <a name="l00133"></a>00133 <span class="keywordflow">return</span> written; <a name="l00134"></a>00134 } <a name="l00135"></a>00135 <a name="l00136"></a>00136 <span class="keywordtype">void</span> <a name="l00137"></a><a class="code" href="buffer_8h.html#a1615da957ad5a24a8b5cc1ba2f2b7f44">00137</a> <a class="code" href="buffer_8c.html#a1615da957ad5a24a8b5cc1ba2f2b7f44" title="frees the buffer.">ldns_buffer_free</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> *buffer) <a name="l00138"></a>00138 { <a name="l00139"></a>00139 <span class="keywordflow">if</span> (!buffer) { <a name="l00140"></a>00140 <span class="keywordflow">return</span>; <a name="l00141"></a>00141 } <a name="l00142"></a>00142 <a name="l00143"></a>00143 <a class="code" href="util_8h.html#a5e13054aa9b3843e97514228a0bbe909">LDNS_FREE</a>(buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a>); <a name="l00144"></a>00144 <a name="l00145"></a>00145 <a class="code" href="util_8h.html#a5e13054aa9b3843e97514228a0bbe909">LDNS_FREE</a>(buffer); <a name="l00146"></a>00146 } <a name="l00147"></a>00147 <a name="l00148"></a>00148 <span class="keywordtype">void</span> * <a name="l00149"></a><a class="code" href="buffer_8h.html#aedc3ca34290f5faad3cca548bb7125ab">00149</a> <a class="code" href="buffer_8c.html#aedc3ca34290f5faad3cca548bb7125ab" title="Makes the buffer fixed and returns a pointer to the data.">ldns_buffer_export</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> *buffer) <a name="l00150"></a>00150 { <a name="l00151"></a>00151 buffer-><a class="code" href="structldns__struct__buffer.html#a67628b76dc8f1e174fa5667e2543bf4a" title="If the buffer is fixed it cannot be resized.">_fixed</a> = 1; <a name="l00152"></a>00152 <span class="keywordflow">return</span> buffer-><a class="code" href="structldns__struct__buffer.html#ae4e2615ee600913816488ec2945b85c7" title="The data contained in the buffer.">_data</a>; <a name="l00153"></a>00153 } <a name="l00154"></a>00154 <a name="l00155"></a>00155 <span class="keywordtype">int</span> <a name="l00156"></a><a class="code" href="parse_8h.html#ac133a49136532ac36150f4378c45bd28">00156</a> <a class="code" href="buffer_8c.html#ac133a49136532ac36150f4378c45bd28" title="returns the next character from a buffer.">ldns_bgetc</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a> *buffer) <a name="l00157"></a>00157 { <a name="l00158"></a>00158 <span class="keywordflow">if</span> (!ldns_buffer_available_at(buffer, buffer-><a class="code" href="structldns__struct__buffer.html#ac62e89526e2292f430cb815620ee2ebb" title="The current position used for reading/writing.">_position</a>, <span class="keyword">sizeof</span>(uint8_t))) { <a name="l00159"></a>00159 ldns_buffer_set_position(buffer, ldns_buffer_limit(buffer)); <a name="l00160"></a>00160 <span class="comment">/* ldns_buffer_rewind(buffer);*/</span> <a name="l00161"></a>00161 <span class="keywordflow">return</span> EOF; <a name="l00162"></a>00162 } <a name="l00163"></a>00163 <span class="keywordflow">return</span> (<span class="keywordtype">int</span>)ldns_buffer_read_u8(buffer); <a name="l00164"></a>00164 } <a name="l00165"></a>00165 <a name="l00166"></a>00166 <span class="keywordtype">void</span> <a name="l00167"></a><a class="code" href="buffer_8h.html#a8aad3e9f377019a428cfd92b0ef6d534">00167</a> <a class="code" href="buffer_8c.html#a8aad3e9f377019a428cfd92b0ef6d534" title="Copy contents of the other buffer to this buffer.">ldns_buffer_copy</a>(<a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a>* result, <a class="code" href="structldns__struct__buffer.html" title="implementation of buffers to ease operations">ldns_buffer</a>* from) <a name="l00168"></a>00168 { <a name="l00169"></a>00169 <span class="keywordtype">size_t</span> tocopy = ldns_buffer_limit(from); <a name="l00170"></a>00170 <a name="l00171"></a>00171 <span class="keywordflow">if</span>(tocopy > ldns_buffer_capacity(result)) <a name="l00172"></a>00172 tocopy = ldns_buffer_capacity(result); <a name="l00173"></a>00173 ldns_buffer_clear(result); <a name="l00174"></a>00174 ldns_buffer_write(result, ldns_buffer_begin(from), tocopy); <a name="l00175"></a>00175 ldns_buffer_flip(result); <a name="l00176"></a>00176 } </pre></div></div> </div> <hr class="footer"/><address class="footer"><small>Generated on Wed Jan 11 2012 for ldns by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.4 </small></address> </body> </html>