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<div class="title">ip6_addr.c</div> </div>
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<div class="contents">
<a href="ip6__addr_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>  </div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * Copyright (c) 2010 Inico Technologies Ltd.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without modification,</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * are permitted provided that the following conditions are met:</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * 3. The name of the author may not be used to endorse or promote products</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * derived from this software without specific prior written permission.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * This file is part of the lwIP TCP/IP stack.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * Author: Ivan Delamer <delamer@inicotech.com></span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * Functions for handling IPv6 addresses.</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * Please coordinate changes and requests with Ivan Delamer</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * <delamer@inicotech.com></span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#include "<a class="code" href="opt_8h.html">net/opt.h</a>"</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#if LWIP_IPV6 </span><span class="comment">/* don't build if not configured for use in lwipopts.h */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#include "<a class="code" href="ip__addr_8h.html">net/ip_addr.h</a>"</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include "<a class="code" href="def_8h.html">net/def.h</a>"</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment">/* used by IP6_ADDR_ANY(6) in ip6_addr.h */</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">const</span> <a class="code" href="ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> ip6_addr_any = <a class="code" href="ip__addr_8h.html#a1266e500b1db0b7cdc4b269cace49746">IPADDR6_INIT</a>(0ul, 0ul, 0ul, 0ul);</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#ifndef isprint</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor">#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#define isprint(c) in_range(c, 0x20, 0x7f)</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#define isdigit(c) in_range(c, '0', '9')</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor">#define islower(c) in_range(c, 'a', 'z')</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor">#define xchar(i) ((i) < 10 ? '0' + (i) : 'A' + (i) - 10)</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> ip6addr_aton(<span class="keyword">const</span> <span class="keywordtype">char</span> *cp, ip6_addr_t *addr)</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> {</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> addr_index, zero_blocks, current_block_index, current_block_value;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keyword">const</span> <span class="keywordtype">char</span> *s;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  </div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="comment">/* Count the number of colons, to count the number of blocks in a "::" sequence</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> zero_blocks may be 1 even if there are no :: sequences */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  zero_blocks = 8;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">for</span> (s = cp; *s != 0; s++) {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">if</span> (*s == <span class="charliteral">':'</span>) {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  zero_blocks--;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!isxdigit(*s)) {</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  }</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  }</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  </div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">/* parse each block */</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  addr_index = 0;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  current_block_index = 0;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  current_block_value = 0;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">for</span> (s = cp; *s != 0; s++) {</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">if</span> (*s == <span class="charliteral">':'</span>) {</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">if</span> (addr) {</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span> (current_block_index & 0x1) {</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  addr->addr[addr_index++] |= current_block_value;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  }</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  addr->addr[addr_index] = current_block_value << 16;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  }</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  }</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  current_block_index++;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  current_block_value = 0;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">if</span> (current_block_index > 7) {</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">/* address too long! */</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  }</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">if</span> (s[1] == <span class="charliteral">':'</span>) {</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">if</span> (s[2] == <span class="charliteral">':'</span>) {</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">/* invalid format: three successive colons */</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  s++;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">/* "::" found, set zeros */</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">while</span> (zero_blocks > 0) {</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  zero_blocks--;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">if</span> (current_block_index & 0x1) {</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  addr_index++;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span> (addr) {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  addr->addr[addr_index] = 0;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  }</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  }</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  current_block_index++;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">if</span> (current_block_index > 7) {</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">/* address too long! */</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  }</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  }</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (isxdigit(*s)) {</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">/* add current digit */</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  current_block_value = (current_block_value << 4) +</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  (isdigit(*s) ? (<a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)(*s - <span class="charliteral">'0'</span>) :</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  (<a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)(10 + (islower(*s) ? *s - <span class="charliteral">'a'</span> : *s - <span class="charliteral">'A'</span>)));</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="comment">/* unexpected digit, space? CRLF? */</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  }</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">if</span> (addr) {</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">if</span> (current_block_index & 0x1) {</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  addr->addr[addr_index++] |= current_block_value;</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  }</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  addr->addr[addr_index] = current_block_value << 16;</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  }</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  </div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="comment">/* convert to network byte order. */</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">if</span> (addr) {</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">for</span> (addr_index = 0; addr_index < 4; addr_index++) {</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  addr->addr[addr_index] = <a class="code" href="def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(addr->addr[addr_index]);</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  }</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">if</span> (current_block_index != 7) {</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  }</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  </div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> }</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  </div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="keywordtype">char</span> *</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> ip6addr_ntoa(<span class="keyword">const</span> ip6_addr_t *addr)</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> {</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keyword">static</span> <span class="keywordtype">char</span> str[40];</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordflow">return</span> ip6addr_ntoa_r(addr, str, 40);</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> }</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  </div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="keywordtype">char</span> *</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> ip6addr_ntoa_r(<span class="keyword">const</span> ip6_addr_t *addr, <span class="keywordtype">char</span> *<a class="code" href="structbuf.html">buf</a>, <span class="keywordtype">int</span> buflen)</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> {</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> current_block_index, current_block_value, next_block_value;</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <a class="code" href="group__compiler__abstraction.html#ga10f9a3d7baef58ccc23228c3bd29c1fb">s32_t</a> i;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> zero_flag, empty_block_flag;</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  </div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  i = 0;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  empty_block_flag = 0; <span class="comment">/* used to indicate a zero chain for "::' */</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  </div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">for</span> (current_block_index = 0; current_block_index < 8; current_block_index++) {</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">/* get the current 16-bit block */</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  current_block_value = <a class="code" href="def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(addr->addr[current_block_index >> 1]);</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">if</span> ((current_block_index & 0x1) == 0) {</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  current_block_value = current_block_value >> 16;</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  }</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  current_block_value &= 0xffff;</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  </div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="comment">/* Check for empty block. */</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordflow">if</span> (current_block_value == 0) {</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="keywordflow">if</span> (current_block_index == 7 && empty_block_flag == 1) {</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">/* special case, we must render a ':' for the last block. */</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <a class="code" href="structbuf.html">buf</a>[i++] = <span class="charliteral">':'</span>;</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">if</span> (i >= buflen) {</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordflow">return</span> <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  }</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  }</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">if</span> (empty_block_flag == 0) {</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="comment">/* generate empty block "::", but only if more than one contiguous zero block,</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> * according to current formatting suggestions RFC 5952. */</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  next_block_value = <a class="code" href="def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(addr->addr[(current_block_index + 1) >> 1]);</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  <span class="keywordflow">if</span> ((current_block_index & 0x1) == 0x01) {</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  next_block_value = next_block_value >> 16;</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  }</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  next_block_value &= 0xffff;</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="keywordflow">if</span> (next_block_value == 0) {</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  empty_block_flag = 1;</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <a class="code" href="structbuf.html">buf</a>[i++] = <span class="charliteral">':'</span>;</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keywordflow">if</span> (i >= buflen) {</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordflow">return</span> <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  }</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keywordflow">continue</span>; <span class="comment">/* move on to next block. */</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  }</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (empty_block_flag == 1) {</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="comment">/* move on to next block. */</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  }</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (empty_block_flag == 1) {</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="comment">/* Set this flag value so we don't produce multiple empty blocks. */</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  empty_block_flag = 2;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  }</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  </div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">if</span> (current_block_index > 0) {</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <a class="code" href="structbuf.html">buf</a>[i++] = <span class="charliteral">':'</span>;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">if</span> (i >= buflen) {</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="keywordflow">return</span> <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  }</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  }</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  </div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordflow">if</span> ((current_block_value & 0xf000) == 0) {</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  zero_flag = 1;</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <a class="code" href="structbuf.html">buf</a>[i++] = xchar(((current_block_value & 0xf000) >> 12));</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  zero_flag = 0;</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">if</span> (i >= buflen) {</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">return</span> <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  }</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  }</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  </div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  <span class="keywordflow">if</span> (((current_block_value & 0xf00) == 0) && (zero_flag)) {</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  <span class="comment">/* do nothing */</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <a class="code" href="structbuf.html">buf</a>[i++] = xchar(((current_block_value & 0xf00) >> 8));</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  zero_flag = 0;</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">if</span> (i >= buflen) {</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordflow">return</span> <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  }</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  }</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  </div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">if</span> (((current_block_value & 0xf0) == 0) && (zero_flag)) {</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="comment">/* do nothing */</span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  }</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <a class="code" href="structbuf.html">buf</a>[i++] = xchar(((current_block_value & 0xf0) >> 4));</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  zero_flag = 0;</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">if</span> (i >= buflen) {</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordflow">return</span> <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  }</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  }</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  </div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <a class="code" href="structbuf.html">buf</a>[i++] = xchar((current_block_value & 0xf));</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordflow">if</span> (i >= buflen) {</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keywordflow">return</span> <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  }</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  }</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  </div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <a class="code" href="structbuf.html">buf</a>[i] = 0;</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  </div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="keywordflow">return</span> <a class="code" href="structbuf.html">buf</a>;</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> }</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  </div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV6 */</span><span class="preprocessor"></span></div>
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