I am a beginner in coccinelle and try to run my first example.

Currently I'am following the steps of this article

1. I created the c file
2. I created the coccinelle script

3. I run it using

   $ spatch -sp_file test.cocci test.c
   

In the terminal I got the expected result as mentioned in the article

--- test.c
+++ /tmp/cocci-output-17416-b5450d-test.c
@@ -7,7 +7,7 @@ main(int argc, char *argv[])
         char *buf;

         /* allocate memory */
-        buf = alloca(bytes);
+        buf = malloc(bytes);

         return 0;
 }

However the c file didn't change as expected.

Can any body tell me where can I get the changes made by the script?