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  45. <div class="title">json_util.h File Reference</div>  </div>

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  47. <div class="contents">

  48. 

  49. <p>Miscllaneous utility functions and macros.  

  50. <a href="#details">More...</a></p>

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  52. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>

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

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  61. <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>

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

  63. <tr class="memitem:a8fa0bba6b7ddb149a2159d99bae709ce"><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="structjson__object.html">json_object</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#a8fa0bba6b7ddb149a2159d99bae709ce">json_object_from_file</a> (const char *filename)</td></tr>

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  65. <tr class="memitem:a62ba7e0f43eb72c418654acf4e263aa6"><td class="memItemLeft" align="right" valign="top">struct <a class="el" href="structjson__object.html">json_object</a> *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#a62ba7e0f43eb72c418654acf4e263aa6">json_object_from_fd</a> (int fd)</td></tr>

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  67. <tr class="memitem:abbd121df84ec3878a5cb8fefaff12ec7"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#abbd121df84ec3878a5cb8fefaff12ec7">json_object_to_file</a> (const char *filename, struct <a class="el" href="structjson__object.html">json_object</a> *obj)</td></tr>

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  69. <tr class="memitem:a4e980954930951bf790c1ec3ba68fb76"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#a4e980954930951bf790c1ec3ba68fb76">json_object_to_file_ext</a> (const char *filename, struct <a class="el" href="structjson__object.html">json_object</a> *obj, int flags)</td></tr>

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  71. <tr class="memitem:adc52c3b220effc880270f095cd748433"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#adc52c3b220effc880270f095cd748433">json_object_to_fd</a> (int fd, struct <a class="el" href="structjson__object.html">json_object</a> *obj, int flags)</td></tr>

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  73. <tr class="memitem:a811b1a5a7544337811a44c26fbe88761"><td class="memItemLeft" align="right" valign="top">const char *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#a811b1a5a7544337811a44c26fbe88761">json_util_get_last_err</a> (void)</td></tr>

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  75. <tr class="memitem:a9bb9882ef2859ca2c1ee17805679bc25"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#a9bb9882ef2859ca2c1ee17805679bc25">json_parse_int64</a> (const char *buf, int64_t *retval)</td></tr>

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  77. <tr class="memitem:a6b5790c15178b6ea97841fc5868b1e1a"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#a6b5790c15178b6ea97841fc5868b1e1a">json_parse_double</a> (const char *buf, double *retval)</td></tr>

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  79. <tr class="memitem:a74031a1b948dc9fed3f367ea6ce78389"><td class="memItemLeft" align="right" valign="top">const char *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="json__util_8h.html#a74031a1b948dc9fed3f367ea6ce78389">json_type_to_name</a> (enum <a class="el" href="json__object_8h.html#ac75c61993722a9b8aaa44704072ec06c">json_type</a> o_type)</td></tr>

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  81. </table>

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

  83. <div class="textblock"><p>Miscllaneous utility functions and macros. </p>

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

  85. <a id="a084b6afc8f7fbef88976aabe4aca7efd"></a>

  86. <h2 class="memtitle"><span class="permalink"><a href="#a084b6afc8f7fbef88976aabe4aca7efd">&#9670;&nbsp;</a></span>JSON_FILE_BUF_SIZE</h2>

  87. 

  88. <div class="memitem">

  89. <div class="memproto">

  90.       <table class="memname">

  91.         <tr>

  92.           <td class="memname">#define JSON_FILE_BUF_SIZE&#160;&#160;&#160;4096</td>

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  96. 

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  100. <h2 class="memtitle"><span class="permalink"><a href="#a57d63d199d4b9ea40359253618951300">&#9670;&nbsp;</a></span>json_max</h2>

  101. 

  102. <div class="memitem">

  103. <div class="memproto">

  104.       <table class="memname">

  105.         <tr>

  106.           <td class="memname">#define json_max</td>

  107.           <td>(</td>

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

  109.           <td class="paramname">a, </td>

  110.         </tr>

  111.         <tr>

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

  113.           <td></td>

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

  115.           <td class="paramname">b&#160;</td>

  116.         </tr>

  117.         <tr>

  118.           <td></td>

  119.           <td>)</td>

  120.           <td></td><td>&#160;&#160;&#160;((a) &gt; (b) ? (a) : (b))</td>

  121.         </tr>

  122.       </table>

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

  124. 

  125. </div>

  126. </div>

  127. <a id="a3dde282dc23d0eaa3c4840df8dc262d4"></a>

  128. <h2 class="memtitle"><span class="permalink"><a href="#a3dde282dc23d0eaa3c4840df8dc262d4">&#9670;&nbsp;</a></span>json_min</h2>

  129. 

  130. <div class="memitem">

  131. <div class="memproto">

  132.       <table class="memname">

  133.         <tr>

  134.           <td class="memname">#define json_min</td>

  135.           <td>(</td>

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

  137.           <td class="paramname">a, </td>

  138.         </tr>

  139.         <tr>

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

  141.           <td></td>

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

  143.           <td class="paramname">b&#160;</td>

  144.         </tr>

  145.         <tr>

  146.           <td></td>

  147.           <td>)</td>

  148.           <td></td><td>&#160;&#160;&#160;((a) &lt; (b) ? (a) : (b))</td>

  149.         </tr>

  150.       </table>

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

  152. 

  153. </div>

  154. </div>

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

  156. <a id="a62ba7e0f43eb72c418654acf4e263aa6"></a>

  157. <h2 class="memtitle"><span class="permalink"><a href="#a62ba7e0f43eb72c418654acf4e263aa6">&#9670;&nbsp;</a></span>json_object_from_fd()</h2>

  158. 

  159. <div class="memitem">

  160. <div class="memproto">

  161.       <table class="memname">

  162.         <tr>

  163.           <td class="memname">struct <a class="el" href="structjson__object.html">json_object</a>* json_object_from_fd </td>

  164.           <td>(</td>

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

  166.           <td class="paramname"><em>fd</em></td><td>)</td>

  167.           <td></td>

  168.         </tr>

  169.       </table>

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

  171. <p>Create a JSON object from already opened file descriptor.</p>

  172. <p>This function can be helpful, when you opened the file already, e.g. when you have a temp file. Note, that the fd must be readable at the actual position, i.e. use lseek(fd, 0, SEEK_SET) before.</p>

  173. <p>Returns -1 if something fails. See <a class="el" href="json__util_8h.html#a811b1a5a7544337811a44c26fbe88761">json_util_get_last_err()</a> for details. </p>

  174. 

  175. </div>

  176. </div>

  177. <a id="a8fa0bba6b7ddb149a2159d99bae709ce"></a>

  178. <h2 class="memtitle"><span class="permalink"><a href="#a8fa0bba6b7ddb149a2159d99bae709ce">&#9670;&nbsp;</a></span>json_object_from_file()</h2>

  179. 

  180. <div class="memitem">

  181. <div class="memproto">

  182.       <table class="memname">

  183.         <tr>

  184.           <td class="memname">struct <a class="el" href="structjson__object.html">json_object</a>* json_object_from_file </td>

  185.           <td>(</td>

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

  187.           <td class="paramname"><em>filename</em></td><td>)</td>

  188.           <td></td>

  189.         </tr>

  190.       </table>

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

  192. <p>Read the full contents of the given file, then convert it to a <a class="el" href="structjson__object.html">json_object</a> using <a class="el" href="json__tokener_8h.html#a236ef64d079822a4411d13eae7190c4d">json_tokener_parse()</a>.</p>

  193. <p>Returns -1 if something fails. See <a class="el" href="json__util_8h.html#a811b1a5a7544337811a44c26fbe88761">json_util_get_last_err()</a> for details. </p>

  194. 

  195. </div>

  196. </div>

  197. <a id="adc52c3b220effc880270f095cd748433"></a>

  198. <h2 class="memtitle"><span class="permalink"><a href="#adc52c3b220effc880270f095cd748433">&#9670;&nbsp;</a></span>json_object_to_fd()</h2>

  199. 

  200. <div class="memitem">

  201. <div class="memproto">

  202.       <table class="memname">

  203.         <tr>

  204.           <td class="memname">int json_object_to_fd </td>

  205.           <td>(</td>

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

  207.           <td class="paramname"><em>fd</em>, </td>

  208.         </tr>

  209.         <tr>

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

  211.           <td></td>

  212.           <td class="paramtype">struct <a class="el" href="structjson__object.html">json_object</a> *&#160;</td>

  213.           <td class="paramname"><em>obj</em>, </td>

  214.         </tr>

  215.         <tr>

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

  217.           <td></td>

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

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

  220.         </tr>

  221.         <tr>

  222.           <td></td>

  223.           <td>)</td>

  224.           <td></td><td></td>

  225.         </tr>

  226.       </table>

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

  228. <p>Convert the <a class="el" href="structjson__object.html">json_object</a> to a string and write it to the file descriptor. Handles partial writes and will keep writing until done, or an error occurs.</p>

  229. <dl class="params"><dt>Parameters</dt><dd>

  230.   <table class="params">

  231.     <tr><td class="paramname">fd</td><td>an open, writable file descriptor to write to </td></tr>

  232.     <tr><td class="paramname">obj</td><td>the object to serializer and write </td></tr>

  233.     <tr><td class="paramname">flags</td><td>flags to pass to <a class="el" href="json__object_8h.html#a9db613127bd4ef7db42307e43a85fc1b">json_object_to_json_string_ext()</a> </td></tr>

  234.   </table>

  235.   </dd>

  236. </dl>

  237. <dl class="section return"><dt>Returns</dt><dd>-1 if something fails. See <a class="el" href="json__util_8h.html#a811b1a5a7544337811a44c26fbe88761">json_util_get_last_err()</a> for details. </dd></dl>

  238. 

  239. </div>

  240. </div>

  241. <a id="abbd121df84ec3878a5cb8fefaff12ec7"></a>

  242. <h2 class="memtitle"><span class="permalink"><a href="#abbd121df84ec3878a5cb8fefaff12ec7">&#9670;&nbsp;</a></span>json_object_to_file()</h2>

  243. 

  244. <div class="memitem">

  245. <div class="memproto">

  246.       <table class="memname">

  247.         <tr>

  248.           <td class="memname">int json_object_to_file </td>

  249.           <td>(</td>

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

  251.           <td class="paramname"><em>filename</em>, </td>

  252.         </tr>

  253.         <tr>

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

  255.           <td></td>

  256.           <td class="paramtype">struct <a class="el" href="structjson__object.html">json_object</a> *&#160;</td>

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

  258.         </tr>

  259.         <tr>

  260.           <td></td>

  261.           <td>)</td>

  262.           <td></td><td></td>

  263.         </tr>

  264.       </table>

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

  266. <p>Equivalent to: json_object_to_file_ext(filename, obj, JSON_C_TO_STRING_PLAIN);</p>

  267. <p>Returns -1 if something fails. See <a class="el" href="json__util_8h.html#a811b1a5a7544337811a44c26fbe88761">json_util_get_last_err()</a> for details. </p>

  268. 

  269. </div>

  270. </div>

  271. <a id="a4e980954930951bf790c1ec3ba68fb76"></a>

  272. <h2 class="memtitle"><span class="permalink"><a href="#a4e980954930951bf790c1ec3ba68fb76">&#9670;&nbsp;</a></span>json_object_to_file_ext()</h2>

  273. 

  274. <div class="memitem">

  275. <div class="memproto">

  276.       <table class="memname">

  277.         <tr>

  278.           <td class="memname">int json_object_to_file_ext </td>

  279.           <td>(</td>

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

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

  282.         </tr>

  283.         <tr>

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

  285.           <td></td>

  286.           <td class="paramtype">struct <a class="el" href="structjson__object.html">json_object</a> *&#160;</td>

  287.           <td class="paramname"><em>obj</em>, </td>

  288.         </tr>

  289.         <tr>

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

  291.           <td></td>

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

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

  294.         </tr>

  295.         <tr>

  296.           <td></td>

  297.           <td>)</td>

  298.           <td></td><td></td>

  299.         </tr>

  300.       </table>

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

  302. <p>Open and truncate the given file, creating it if necessary, then convert the <a class="el" href="structjson__object.html">json_object</a> to a string and write it to the file.</p>

  303. <p>Returns -1 if something fails. See <a class="el" href="json__util_8h.html#a811b1a5a7544337811a44c26fbe88761">json_util_get_last_err()</a> for details. </p>

  304. 

  305. </div>

  306. </div>

  307. <a id="a6b5790c15178b6ea97841fc5868b1e1a"></a>

  308. <h2 class="memtitle"><span class="permalink"><a href="#a6b5790c15178b6ea97841fc5868b1e1a">&#9670;&nbsp;</a></span>json_parse_double()</h2>

  309. 

  310. <div class="memitem">

  311. <div class="memproto">

  312.       <table class="memname">

  313.         <tr>

  314.           <td class="memname">int json_parse_double </td>

  315.           <td>(</td>

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

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

  318.         </tr>

  319.         <tr>

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

  321.           <td></td>

  322.           <td class="paramtype">double *&#160;</td>

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

  324.         </tr>

  325.         <tr>

  326.           <td></td>

  327.           <td>)</td>

  328.           <td></td><td></td>

  329.         </tr>

  330.       </table>

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

  332. 

  333. </div>

  334. </div>

  335. <a id="a9bb9882ef2859ca2c1ee17805679bc25"></a>

  336. <h2 class="memtitle"><span class="permalink"><a href="#a9bb9882ef2859ca2c1ee17805679bc25">&#9670;&nbsp;</a></span>json_parse_int64()</h2>

  337. 

  338. <div class="memitem">

  339. <div class="memproto">

  340.       <table class="memname">

  341.         <tr>

  342.           <td class="memname">int json_parse_int64 </td>

  343.           <td>(</td>

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

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

  346.         </tr>

  347.         <tr>

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

  349.           <td></td>

  350.           <td class="paramtype">int64_t *&#160;</td>

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

  352.         </tr>

  353.         <tr>

  354.           <td></td>

  355.           <td>)</td>

  356.           <td></td><td></td>

  357.         </tr>

  358.       </table>

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

  360. 

  361. </div>

  362. </div>

  363. <a id="a74031a1b948dc9fed3f367ea6ce78389"></a>

  364. <h2 class="memtitle"><span class="permalink"><a href="#a74031a1b948dc9fed3f367ea6ce78389">&#9670;&nbsp;</a></span>json_type_to_name()</h2>

  365. 

  366. <div class="memitem">

  367. <div class="memproto">

  368.       <table class="memname">

  369.         <tr>

  370.           <td class="memname">const char* json_type_to_name </td>

  371.           <td>(</td>

  372.           <td class="paramtype">enum <a class="el" href="json__object_8h.html#ac75c61993722a9b8aaa44704072ec06c">json_type</a>&#160;</td>

  373.           <td class="paramname"><em>o_type</em></td><td>)</td>

  374.           <td></td>

  375.         </tr>

  376.       </table>

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

  378. <p>Return a string describing the type of the object. e.g. "int", or "object", etc... </p>

  379. 

  380. </div>

  381. </div>

  382. <a id="a811b1a5a7544337811a44c26fbe88761"></a>

  383. <h2 class="memtitle"><span class="permalink"><a href="#a811b1a5a7544337811a44c26fbe88761">&#9670;&nbsp;</a></span>json_util_get_last_err()</h2>

  384. 

  385. <div class="memitem">

  386. <div class="memproto">

  387.       <table class="memname">

  388.         <tr>

  389.           <td class="memname">const char* json_util_get_last_err </td>

  390.           <td>(</td>

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

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

  393.           <td></td>

  394.         </tr>

  395.       </table>

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

  397. <p>Return the last error from various json-c functions, including: json_object_to_file{,<em>ext}, <a class="el" href="json__util_8h.html#adc52c3b220effc880270f095cd748433">json_object_to_fd()</a> or json_object_from</em>{file,fd}, or NULL if there is none. </p>

  398. 

  399. </div>

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