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  52. <div class="title">printbuf.h File Reference</div>  </div>

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  54. <div class="contents">

  55. 

  56. <p>Internal string buffer handing. Unless you're writing a json_object_to_json_string_fn implementation for use with <a class="el" href="json__object_8h.html#a889345512a214b8f78f6a73561523c7c">json_object_set_serializer()</a> direct use of this is not recommended.  

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  65. Macros</h2></td></tr>

  66. <tr class="memitem:a6f3a4dc87fab41c37e3eff42f40dc346"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="printbuf_8h.html#a6f3a4dc87fab41c37e3eff42f40dc346">printbuf_memappend_fast</a>(p, bufptr, bufsize)</td></tr>

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  70. <tr class="memitem:ab009973c5e15aae191e610cd70752603"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="printbuf_8h.html#ab009973c5e15aae191e610cd70752603">_printbuf_check_literal</a>(mystr)&#160;&#160;&#160;(&quot;&quot; mystr)</td></tr>

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  81. Functions</h2></td></tr>

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  90. <tr class="memitem:a4393ee3dedb376af11c96fe97532292e"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="printbuf_8h.html#a4393ee3dedb376af11c96fe97532292e">printbuf_reset</a> (struct <a class="el" href="structprintbuf.html">printbuf</a> *p)</td></tr>

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  92. <tr class="memitem:ab525221c767ac65c58ddeea8a655a4e8"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="printbuf_8h.html#ab525221c767ac65c58ddeea8a655a4e8">printbuf_free</a> (struct <a class="el" href="structprintbuf.html">printbuf</a> *p)</td></tr>

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  95. <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>

  96. <div class="textblock"><p>Internal string buffer handing. Unless you're writing a json_object_to_json_string_fn implementation for use with <a class="el" href="json__object_8h.html#a889345512a214b8f78f6a73561523c7c">json_object_set_serializer()</a> direct use of this is not recommended. </p>

  97. </div><h2 class="groupheader">Macro Definition Documentation</h2>

  98. <a class="anchor" id="ab009973c5e15aae191e610cd70752603"></a>

  99. <div class="memitem">

  100. <div class="memproto">

  101.       <table class="memname">

  102.         <tr>

  103.           <td class="memname">#define _printbuf_check_literal</td>

  104.           <td>(</td>

  105.           <td class="paramtype">&#160;</td>

  106.           <td class="paramname">mystr</td><td>)</td>

  107.           <td>&#160;&#160;&#160;(&quot;&quot; mystr)</td>

  108.         </tr>

  109.       </table>

  110. </div><div class="memdoc">

  111. <p>Results in a compile error if the argument is not a string literal. </p>

  112. 

  113. </div>

  114. </div>

  115. <a class="anchor" id="acdd84ad88987c0166b7ba0e3f1f8f1bb"></a>

  116. <div class="memitem">

  117. <div class="memproto">

  118.       <table class="memname">

  119.         <tr>

  120.           <td class="memname">#define printbuf_length</td>

  121.           <td>(</td>

  122.           <td class="paramtype">&#160;</td>

  123.           <td class="paramname">p</td><td>)</td>

  124.           <td>&#160;&#160;&#160;((p)-&gt;bpos)</td>

  125.         </tr>

  126.       </table>

  127. </div><div class="memdoc">

  128. 

  129. </div>

  130. </div>

  131. <a class="anchor" id="a6f3a4dc87fab41c37e3eff42f40dc346"></a>

  132. <div class="memitem">

  133. <div class="memproto">

  134.       <table class="memname">

  135.         <tr>

  136.           <td class="memname">#define printbuf_memappend_fast</td>

  137.           <td>(</td>

  138.           <td class="paramtype">&#160;</td>

  139.           <td class="paramname">p, </td>

  140.         </tr>

  141.         <tr>

  142.           <td class="paramkey"></td>

  143.           <td></td>

  144.           <td class="paramtype">&#160;</td>

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  146.         </tr>

  147.         <tr>

  148.           <td class="paramkey"></td>

  149.           <td></td>

  150.           <td class="paramtype">&#160;</td>

  151.           <td class="paramname">bufsize&#160;</td>

  152.         </tr>

  153.         <tr>

  154.           <td></td>

  155.           <td>)</td>

  156.           <td></td><td></td>

  157.         </tr>

  158.       </table>

  159. </div><div class="memdoc">

  160. <b>Value:</b><div class="fragment"><div class="line"><span class="keywordflow">do</span> {                                                         \</div>

  161. <div class="line">  if ((p-&gt;size - p-&gt;bpos) &gt; bufsize) {                       \</div>

  162. <div class="line">    memcpy(p-&gt;buf + p-&gt;bpos, (bufptr), bufsize);             \</div>

  163. <div class="line">    p-&gt;bpos += bufsize;                                      \</div>

  164. <div class="line">    p-&gt;buf[p-&gt;bpos]= <span class="charliteral">&#39;\0&#39;</span>;                                   \</div>

  165. <div class="line">  } <span class="keywordflow">else</span> {  <a class="code" href="printbuf_8h.html#a22f09779a19db59a83e7cb8c2ce4c75f">printbuf_memappend</a>(p, (bufptr), bufsize); }      \</div>

  166. <div class="line">} <span class="keywordflow">while</span> (0)</div>

  167. <div class="ttc" id="printbuf_8h_html_a22f09779a19db59a83e7cb8c2ce4c75f"><div class="ttname"><a href="printbuf_8h.html#a22f09779a19db59a83e7cb8c2ce4c75f">printbuf_memappend</a></div><div class="ttdeci">int printbuf_memappend(struct printbuf *p, const char *buf, int size)</div></div>

  168. </div><!-- fragment -->

  169. </div>

  170. </div>

  171. <a class="anchor" id="a2f30492682f5fbc59a8749b428e0e4ba"></a>

  172. <div class="memitem">

  173. <div class="memproto">

  174.       <table class="memname">

  175.         <tr>

  176.           <td class="memname">#define printbuf_strappend</td>

  177.           <td>(</td>

  178.           <td class="paramtype">&#160;</td>

  179.           <td class="paramname">pb, </td>

  180.         </tr>

  181.         <tr>

  182.           <td class="paramkey"></td>

  183.           <td></td>

  184.           <td class="paramtype">&#160;</td>

  185.           <td class="paramname">str&#160;</td>

  186.         </tr>

  187.         <tr>

  188.           <td></td>

  189.           <td>)</td>

  190.           <td></td><td>&#160;&#160;&#160;<a class="el" href="printbuf_8h.html#a22f09779a19db59a83e7cb8c2ce4c75f">printbuf_memappend</a> ((pb), <a class="el" href="printbuf_8h.html#ab009973c5e15aae191e610cd70752603">_printbuf_check_literal</a>(str), sizeof(str) - 1)</td>

  191.         </tr>

  192.       </table>

  193. </div><div class="memdoc">

  194. <p>This is an optimization wrapper around <a class="el" href="printbuf_8h.html#a22f09779a19db59a83e7cb8c2ce4c75f">printbuf_memappend()</a> that is useful for appending string literals. Since the size of string constants is known at compile time, using this macro can avoid a costly strlen() call. This is especially helpful when a constant string must be appended many times. If you got here because of a compilation error caused by passing something other than a string literal, use <a class="el" href="printbuf_8h.html#a6f3a4dc87fab41c37e3eff42f40dc346">printbuf_memappend_fast()</a> in conjunction with strlen().</p>

  195. <p>See also: <a class="el" href="printbuf_8h.html#a6f3a4dc87fab41c37e3eff42f40dc346">printbuf_memappend_fast()</a> <a class="el" href="printbuf_8h.html#a22f09779a19db59a83e7cb8c2ce4c75f">printbuf_memappend()</a> <a class="el" href="printbuf_8h.html#adf6214db6c8ce994c7f7f1180863c8a4">sprintbuf()</a> </p>

  196. 

  197. </div>

  198. </div>

  199. <h2 class="groupheader">Typedef Documentation</h2>

  200. <a class="anchor" id="ace274df280df67463ff417b1b3392395"></a>

  201. <div class="memitem">

  202. <div class="memproto">

  203.       <table class="memname">

  204.         <tr>

  205.           <td class="memname">typedef struct <a class="el" href="structprintbuf.html">printbuf</a> <a class="el" href="structprintbuf.html">printbuf</a></td>

  206.         </tr>

  207.       </table>

  208. </div><div class="memdoc">

  209. 

  210. </div>

  211. </div>

  212. <h2 class="groupheader">Function Documentation</h2>

  213. <a class="anchor" id="ab525221c767ac65c58ddeea8a655a4e8"></a>

  214. <div class="memitem">

  215. <div class="memproto">

  216.       <table class="memname">

  217.         <tr>

  218.           <td class="memname">void printbuf_free </td>

  219.           <td>(</td>

  220.           <td class="paramtype">struct <a class="el" href="structprintbuf.html">printbuf</a> *&#160;</td>

  221.           <td class="paramname"><em>p</em></td><td>)</td>

  222.           <td></td>

  223.         </tr>

  224.       </table>

  225. </div><div class="memdoc">

  226. 

  227. </div>

  228. </div>

  229. <a class="anchor" id="a22f09779a19db59a83e7cb8c2ce4c75f"></a>

  230. <div class="memitem">

  231. <div class="memproto">

  232.       <table class="memname">

  233.         <tr>

  234.           <td class="memname">int printbuf_memappend </td>

  235.           <td>(</td>

  236.           <td class="paramtype">struct <a class="el" href="structprintbuf.html">printbuf</a> *&#160;</td>

  237.           <td class="paramname"><em>p</em>, </td>

  238.         </tr>

  239.         <tr>

  240.           <td class="paramkey"></td>

  241.           <td></td>

  242.           <td class="paramtype">const char *&#160;</td>

  243.           <td class="paramname"><em>buf</em>, </td>

  244.         </tr>

  245.         <tr>

  246.           <td class="paramkey"></td>

  247.           <td></td>

  248.           <td class="paramtype">int&#160;</td>

  249.           <td class="paramname"><em>size</em>&#160;</td>

  250.         </tr>

  251.         <tr>

  252.           <td></td>

  253.           <td>)</td>

  254.           <td></td><td></td>

  255.         </tr>

  256.       </table>

  257. </div><div class="memdoc">

  258. 

  259. </div>

  260. </div>

  261. <a class="anchor" id="ad7fc6ec4c296e85abf404244614cded5"></a>

  262. <div class="memitem">

  263. <div class="memproto">

  264.       <table class="memname">

  265.         <tr>

  266.           <td class="memname">int printbuf_memset </td>

  267.           <td>(</td>

  268.           <td class="paramtype">struct <a class="el" href="structprintbuf.html">printbuf</a> *&#160;</td>

  269.           <td class="paramname"><em>pb</em>, </td>

  270.         </tr>

  271.         <tr>

  272.           <td class="paramkey"></td>

  273.           <td></td>

  274.           <td class="paramtype">int&#160;</td>

  275.           <td class="paramname"><em>offset</em>, </td>

  276.         </tr>

  277.         <tr>

  278.           <td class="paramkey"></td>

  279.           <td></td>

  280.           <td class="paramtype">int&#160;</td>

  281.           <td class="paramname"><em>charvalue</em>, </td>

  282.         </tr>

  283.         <tr>

  284.           <td class="paramkey"></td>

  285.           <td></td>

  286.           <td class="paramtype">int&#160;</td>

  287.           <td class="paramname"><em>len</em>&#160;</td>

  288.         </tr>

  289.         <tr>

  290.           <td></td>

  291.           <td>)</td>

  292.           <td></td><td></td>

  293.         </tr>

  294.       </table>

  295. </div><div class="memdoc">

  296. <p>Set len bytes of the buffer to charvalue, starting at offset offset. Similar to calling memset(x, charvalue, len);</p>

  297. <p>The memory allocated for the buffer is extended as necessary.</p>

  298. <p>If offset is -1, this starts at the end of the current data in the buffer. </p>

  299. 

  300. </div>

  301. </div>

  302. <a class="anchor" id="a3e390ebc7660a18335edd89f640fd415"></a>

  303. <div class="memitem">

  304. <div class="memproto">

  305.       <table class="memname">

  306.         <tr>

  307.           <td class="memname">struct <a class="el" href="structprintbuf.html">printbuf</a>* printbuf_new </td>

  308.           <td>(</td>

  309.           <td class="paramtype">void&#160;</td>

  310.           <td class="paramname"></td><td>)</td>

  311.           <td></td>

  312.         </tr>

  313.       </table>

  314. </div><div class="memdoc">

  315. 

  316. </div>

  317. </div>

  318. <a class="anchor" id="a4393ee3dedb376af11c96fe97532292e"></a>

  319. <div class="memitem">

  320. <div class="memproto">

  321.       <table class="memname">

  322.         <tr>

  323.           <td class="memname">void printbuf_reset </td>

  324.           <td>(</td>

  325.           <td class="paramtype">struct <a class="el" href="structprintbuf.html">printbuf</a> *&#160;</td>

  326.           <td class="paramname"><em>p</em></td><td>)</td>

  327.           <td></td>

  328.         </tr>

  329.       </table>

  330. </div><div class="memdoc">

  331. 

  332. </div>

  333. </div>

  334. <a class="anchor" id="adf6214db6c8ce994c7f7f1180863c8a4"></a>

  335. <div class="memitem">

  336. <div class="memproto">

  337.       <table class="memname">

  338.         <tr>

  339.           <td class="memname">int sprintbuf </td>

  340.           <td>(</td>

  341.           <td class="paramtype">struct <a class="el" href="structprintbuf.html">printbuf</a> *&#160;</td>

  342.           <td class="paramname"><em>p</em>, </td>

  343.         </tr>

  344.         <tr>

  345.           <td class="paramkey"></td>

  346.           <td></td>

  347.           <td class="paramtype">const char *&#160;</td>

  348.           <td class="paramname"><em>msg</em>, </td>

  349.         </tr>

  350.         <tr>

  351.           <td class="paramkey"></td>

  352.           <td></td>

  353.           <td class="paramtype">&#160;</td>

  354.           <td class="paramname"><em>...</em>&#160;</td>

  355.         </tr>

  356.         <tr>

  357.           <td></td>

  358.           <td>)</td>

  359.           <td></td><td></td>

  360.         </tr>

  361.       </table>

  362. </div><div class="memdoc">

  363. <p>Formatted print to printbuf.</p>

  364. <p>This function is the most expensive of the available functions for appending string data to a printbuf and should be used only where convenience is more important than speed. Avoid using this function in high performance code or tight loops; in these scenarios, consider using snprintf() with a static buffer in conjunction with one of the printbuf_*append() functions.</p>

  365. <p>See also: <a class="el" href="printbuf_8h.html#a6f3a4dc87fab41c37e3eff42f40dc346">printbuf_memappend_fast()</a> <a class="el" href="printbuf_8h.html#a22f09779a19db59a83e7cb8c2ce4c75f">printbuf_memappend()</a> <a class="el" href="printbuf_8h.html#a2f30492682f5fbc59a8749b428e0e4ba">printbuf_strappend()</a> </p>

  366. 

  367. </div>

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