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POC - Trying to go back to previous line in the file
 

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  1. POC - Trying to go back to previous line in the file
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    <p>I have to read a text file which can begin with optional comments. In practice I have to skip any line at the beginning of the file that doesn't begin with '@' or '>'. In my test case the file looks like:</p> <pre><code># Sun Jul 12 22:04:52 2009 /share/apps/corona/bin/filter_fasta.pl --output=/data/results/solid0065/primary.20090712170542775 # Cwd: /state/partition1/home/pipeline # Title: solid0065_20090629_FC1_Tomate_Heinz_4_5_Kb_Tomate_Heinz_4_5_Kb_01 &gt;125_963_316_F3 T1230330231223011323010013 </code></pre> <p><br /></p> <p>So I have to skip the first 3 line (but in general I have to skip n lines). I have to repeat this with 2 or 4 files [which are inside FILE** inputFiles]. I've tried with this loop:</p> <pre><code>buffer = (char*) malloc (sizeof(char) * 5000); if (buffer == NULL) notEnoughMemory(); for (i = 0; i &lt; (cIn-1); i++){ fgetpos(inputFiles[i], &amp;position); fgets(buffer, 4999, inputFiles[i]); while ((buffer[0] != '@') &amp;&amp; (buffer[0] != '&gt;')){ fgetpos(inputFiles[i], &amp;position); fgets(buffer, 4999, inputFiles[i]); } fsetpos(inputFiles[i], &amp;position); } </code></pre> <p><br /></p> <p>Where cIn is number_of_input_files + 1. Trying to debug it the loop correctly stops after it reads the fourth line. But when I use setpos it doesn't go back to the beginning of the fourth line as I'd expect, but at the middle of the third. In fact if, exactly after the fsetpos(), I print buffer after these operations:</p> <pre><code>fgets(buffer, 4999, inputFiles[i]); fgets(buffer, 4999, inputFiles[i]); </code></pre> <p>I get:</p> <pre><code>FC1_Tomate_Heinz_4_5_Kb_Tomate_Heinz_4_5_Kb_01 &gt;125_963_316_F3 </code></pre> <p>Any idea? Thanks in advance</p>
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