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4: Of course, not only strings can be specified in the configuration file.
5: libConfuse can parse strings, integers, booleans and floating point values.
6: These are the fundamental values, and they are all also available as lists.
7: We'll talk more about lists in the next chapter.
8: </p><p>
9: The macros used to initialize a string, integer, boolean and a
10: float is, respectively, <code class="function">CFG_STR()</code>,
11: <code class="function">CFG_INT()</code>, <code class="function">CFG_BOOL()</code>,
12: <code class="function">CFG_FLOAT()</code> and
13: <code class="function">CFG_PTR()</code>. All macros take three parameters:
14: the name of the option, a default value and flags. To retrieve the
15: values, use <code class="function">cfg_getstr()</code>,
16: <code class="function">cfg_getint()</code>,
17: <code class="function">cfg_getbool()</code>,
18: <code class="function">cfg_getfloat()</code> or
19: <code class="function">cfg_getptr()</code>, respectively.
20: </p><p>
21: Let's introduce an integer option that tells us how many times to print the
22: greeting:
23: </p><a id="listing3"></a><pre class="programlisting">
24: 1 #include <stdio.h>
25: 2 #include <confuse.h>
26: 3
27: 4 int main(void)
28: 5 {
29: 6 cfg_opt_t opts[] =
30: 7 {
31: 8 CFG_STR("target", "World", CFGF_NONE),
32: 9 CFG_INT("repeat", 1, CFGF_NONE),
33: 10 CFG_END()
34: 11 };
35: 12 cfg_t *cfg;
36: 13 int repeat;
37: 14
38: 15 cfg = cfg_init(opts, CFGF_NONE);
39: 16 if(cfg_parse(cfg, "hello.conf") == CFG_PARSE_ERROR)
40: 17 return 1;
41: 18
42: 19 repeat = cfg_getint(cfg, "repeat");
43: 20 while(repeat--)
44: 21 printf("Hello, %s!\n", cfg_getstr(cfg, "target"));
45: 22
46: 23 cfg_free(cfg);
47: 24 return 0;
48: 25 }
49: 26
50: </pre><p>
51: Here we have used the <code class="function">CFG_INT()</code> macro to
52: initialize an integer option named "repeat". The default value is 1
53: as in the standard greeting. The value is retrieved with
54: <code class="function">cfg_getint()</code>.
55: </p><p><a id="negative-repeat-problem"></a>
56: But, wait a moment, what if the user specified a negative value for
57: "repeat"? Or a too large positive value? libConfuse can handle
58: that with a so-called validating callback. We'll come back to this
59: problem later on, but we will first take a look at lists.
60: </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="index.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="ar01s03.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">libConfuse tutorial </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 3. Introducing lists</td></tr></table></div></body></html>
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