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POParsing string based on initial format
 

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    <p>I'm trying to parse a set of lines and extract certain parts of the string based on an initial format (reading a configuration file).</p> <p>A little more explanation: the format can contain up to <em>4</em> parts to be formatted. This case, <code>%S</code> will skip the part, <code>%a-%c</code> will extract the part and will be treated as a string, <code>%d</code> as int.</p> <p>What I am trying to do now is to come up with some clever way to parse it. So far I came up with the following prototype. However, my pointer arithmetic still needs some work to skip/extract the parts.</p> <p>Ultimately each part will be stored on an array of structs.</p> <p><strong>Edit:</strong> using <code>sscanf</code> might not work in this case, since the format is specified in a configuration file. Additionally, the format could scale, string (and type) may change.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;string.h&gt; #define DIM(x) (sizeof(x)/sizeof(*(x))) void process (const char *fmt, const char *line) { char c; const char *src = fmt; while ((c = *src++) != '\0') { if (c == 'S'); // skip part else if (c == 'a'); // extract %a else if (c == 'b'); // extract %b else if (c == 'c'); // extract %c else if (c == 'd'); // extract %d (int) else { printf("Unknown format\n"); exit(1); } } } static const char *input[] = { "bar 200.1 / / (zaz) - \"bon 10\"", "foo 100.1 / / (baz) - \"apt 20\"", }; int main (void) { const char *fmt = "%S %a / / (%b) - \"%c %d\""; size_t i; for(i = 0; i &lt; DIM (input); i++) { process (fmt, input[i]); } return (0); } </code></pre>
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    1. COWhat is the question?
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      1. USOliver Charlesworth
    2. COAppears you want to create a new printf, Am I right? Give us a example of input and what should be the output.
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      1. USOrlando Leite
    3. COWhat are you trying to do? Something like printf? Because this won't work....
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      1. USEvan Dark
 

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