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@@ -2,39 +2,51 @@
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<body>
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<?php
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-$saving = $_REQUEST['saving'];
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-if ($saving == 1){
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-$data = $_POST['data'];
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-$args = $_POST['args'];
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-$stdin= $_POST['stdin'];
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-$unique = rand(1, 10000);
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-$file = "prog".$unique.".c";
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-$srcpath = "./".$file;
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-$executable = "./"."prog".$unique;
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-$fp = fopen($file, "w") or die("<p>Couldn't open $file for writing!</p>");
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-fwrite($fp, $data) or die("<p>Couldn't write values to file!</p>");
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+$saving = $_REQUEST['saving']; //check whether a saving request is provided
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+if ($saving == 1) //do if saving request is provided
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+{
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+ $data = $_POST['data']; //extract the code from the form into a variable
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+ $args = $_POST['args']; //extract the command-line arguments from the form into a variable
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+ $stdin= $_POST['stdin']; //extract the standard input from the form into a variable
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+ $unique = rand(1, 10000); //generate a random number for the current execution session
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+ $file = "prog".$unique.".c"; //declare the file name
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+ $srcpath = "./".$file; //declare the source file path
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+ $executable = "./"."prog".$unique.".bin"; //declare the executable path
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+ $fp = fopen($file, "w") or die("<p>Couldn't open $file for writing!</p>"); //open file for writing
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+ if(!fwrite($fp, $data)) //write the code to file
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+ {
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+ shell_exec("rm -rf $srcpath");
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+ die("<p>Couldn't write values to file!</p>"); //clean up and exit if unable to write
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+ }
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-fclose($fp);
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-echo "<p>Saved to $file successfully!</p>";
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+ fclose($fp); //close and save the file
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+ echo "<p>Saved to $file successfully!</p>"; //notify the user that file has been saved
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-echo"<p>
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-Compiling the program $file<br>
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-Error list:<br>";
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-$output1 = shell_exec("g++ $srcpath -o $executable 2>&1");
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-echo "$output1";
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-echo "</p>";
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-echo "<p>Running the program:<br>";
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-$output2 = shell_exec("echo $stdin | $executable $args");
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-echo "$output2";
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-echo "<br>
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-</p>";
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-
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-shell_exec("rm -rf $srcpath $executable");
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+ echo"<p>Compiling the program $file<br>";
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+ $output1 = shell_exec("g++ $srcpath -o $executable 2>&1");
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+ /* try compiling the program with GCC and collect errors and warnings */
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+ if($output1!=NULL)
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+ {
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+ echo "Error list:<br><pre>$output1</pre>"; //display the errors and warnings if present
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+ }
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+ echo "</p>";
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+ if(file_exists($executable)) //check if executable exists
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+ {
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+ echo "<p>Running the program:<br>";
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+ $output2 = shell_exec("echo $stdin | $executable $args 2>&1");
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+ /* execute the file providing the necessary inputs and collect the output */
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+ echo "<pre>$output2</pre>";
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+ echo "<br></p>";
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+ }
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+
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+ shell_exec("rm -rf $srcpath $executable"); //clean up the session files
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}
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-else {
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-echo "<p>Enter your code in the left frame and hit run to display the output.</p>";
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+else //do if saving request is not provided
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+{
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+ echo "<p>Enter your code in the left frame and hit run to display the output.</p>";
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+ /* tell the user to fill up the form on the left frame */
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}
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?>
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</body>
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-</html>
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+</html>
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