Secure Code Seperation

stars.c

+#include<stdio.h>
+#include<stdlib.h>
+
+/*
+Input: ./a.out 5
+
+Output:
+
+*
+**
+***
+****
+*****
+
+*/
+
+int main(int argc, char *argv[]){
+	int count = atoi(argv[1]);
+	for(int i=0; i<=count; i++){
+		for(int j=0; j<i; j++){
+			printf("*");
+		}
+		printf("\n");
+	}
+	printf("\n");
+	return 0;
+}
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stars.php

+<pre>
+<?
+
+//secure code
+// if(isset($_GET['count'])){
+// 	$count = $_GET['count'];
+// 	$re = "/^[0-9]+$/";
+// 	$matches = preg_match($re, $count);
+// 	print_r($matches);
+// 	if($matches){
+// 		$cmd = "./stars $count";
+// 		print($cmd);
+// 		system($cmd);
+// 	} else {
+// 		print("Don't try to hack me :D");
+// 	}
+// } else {
+// 	echo "Something is wrong";
+// }
+
+//insecure code
+if(isset($_GET['count'])){
+	$count = $_GET['count'];
+	$re = "/^[0-9]+$/";
+	$cmd = "./stars $count";
+	print($cmd);
+	system($cmd);
+} else {
+	echo "Something is wrong";
+}
+?></pre>
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