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    <p>If you want to use <code>scanf</code> you could just allocate a large enough buffer to hold any possible value, say 1024 bytes, then use a maximum field width specifier of 1024.</p> <p>The <code>m</code> and <code>a</code> are specific non-standard GNU extensions, so thats why Microsofts compiler does not support them. One could wish that visual studio did.</p> <p>Here is an example using <code>scanf</code> to read settings, and just print them back out:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;errno.h&gt; #include &lt;malloc.h&gt; int main( int argc, char **argv ) { // usage ./a.out &lt; settings.conf char *varname; int value, r, run = 1; varname = malloc( 1024 ); // clear errno errno = 0; while( run ) { // match any number of "variable = #number" and do some "processing" // the 1024 here is the maximum field width specifier. r = scanf ( "%1024s = %d", varname, &amp;value ); if( r == 2 ) { // matched both string and number printf( " Variable %s is set to %d \n", varname, value ); } else { // it did not, either there was an error in which case errno was // set or we are out of variables to match if( errno != 0 ) { // an error has ocurred. perror("scanf"); } run = 0; } } return 0; } </code></pre> <p>Here is an example <code>settings.conf</code></p> <pre><code>cake = 5 three = 3 answertolifeuniverseandeverything = 42 charcoal = -12 </code></pre> <p>You can read more about <a href="http://www.kernel.org/doc/man-pages/online/pages/man3/scanf.3.html" rel="nofollow noreferrer" title="man 3 scanf"><code>scanf</code> on the manpages</a>.</p> <p>And you can of course use <code>getline()</code>, and after that parse character after character.</p> <p>If you would go into a little more what you are trying to achieve you could maybe get an better answer.</p>
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    1. COI would explain how to write a field width specifier, since OP is likely not to know and just to ignore the advice, creating a buffer overflow vulnerability...
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    2. CORight, I probably should. But what does OP stand for?
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