embedaddon/confuse/doc/tutorial-html/ar01s07.html - view

File: [ELWIX - Embedded LightWeight unIX -] / embedaddon / confuse / doc / tutorial-html / ar01s07.html
Revision 1.1.1.2 (vendor branch): download - view: text, annotated - select for diffs - revision graph
Wed Mar 17 00:49:17 2021 UTC (3 years, 4 months ago) by misho
Branches: confuse, MAIN
CVS tags: v3_3, HEAD

confuse 3.3

<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>7. Value parsing callback</title><link rel="stylesheet" type="text/css" href="tutorial.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="index.html" title="libConfuse tutorial" /><link rel="up" href="index.html" title="libConfuse tutorial" /><link rel="prev" href="ar01s06.html" title="6. Validating callback functions" /><link rel="next" href="ar01s08.html" title="8. Functions" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">7. Value parsing callback</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ar01s06.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="ar01s08.html">Next</a></td></tr></table><hr /></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="idm133"></a>7. Value parsing callback</h2></div></div></div><p> A value parsing callback is another kind of callback function available in libConfuse. This function is used to map a string into some other value. One example is to extend a boolean option to accept the values "yes", "no" and "ask" (or perhaps "true", "false" and "maybe"). Those values should be mapped to the integers 1, 2 and 3. </p><pre class="programlisting"> typedef int (*cfg_callback_t)(cfg_t *cfg, cfg_opt_t *opt, const char *value, void *result); </pre><p> </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ar01s06.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="ar01s08.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6. Validating callback functions </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 8. Functions</td></tr></table></div></body></html>