update

1 files changed, 22 insertions, 1 deletions

diff --git a/utils/argv_fuzzing/argv_fuzz_persistent_demo.c b/utils/argv_fuzzing/argv_fuzz_persistent_demo.c
index 1e96ade1..a96cf1fe 100644
--- a/utils/argv_fuzzing/argv_fuzz_persistent_demo.c
+++ b/utils/argv_fuzzing/argv_fuzz_persistent_demo.c
@@ -1,28 +1,49 @@
+/*
+This file contains a simple fuzzer for testing command line argument parsing
+using persistent mode.
+*/
+
 #include <stdio.h>
 #include <string.h>
 #include "argv-fuzz-inl.h"
 
 __AFL_FUZZ_INIT();
 
+/* The main function is an entry point for a program.
+   The argc parameter is an integer that indicates the number of arguments
+   passed to the program. The argv parameter is an array of character pointers,
+   with each element pointing to a null-terminated string that represents
+   one of the arguments.
+ */
 int main(int argc, char **argv) {
 #ifdef __AFL_HAVE_MANUAL_CONTROL
   __AFL_INIT();
 #endif
   unsigned char *buf = __AFL_FUZZ_TESTCASE_BUF;
 
+  /* __AFL_LOOP() limits the maximum number of iterations before exiting
+     the loop and allowing the program to terminate. It protects against
+     accidental memory leaks and similar issues. */
   while (__AFL_LOOP(100000)) {
     int len = __AFL_FUZZ_TESTCASE_LEN;
 
+    // Check that the length of the test case is at least 8 bytes
     if (len < 8) continue;
 
+    // Initialize the command line arguments using the testcase buffer
     AFL_INIT_ARGV_PERSISTENT(buf);
 
+    /* Check if the first argument is "XYZ" and the second argument is "TEST2"
+       If so, call the "abort" function to terminate the program.
+       Otherwise, print an error message. */
     if (argc > 1 && strcmp(argv[1], "XYZ") == 0) {
       if (strcmp(argv[2], "TEST2") == 0) { abort(); }
     } else {
       printf("Bad number of arguments!\n");
     }
   }
-
+  /* Exiting the loop allows the program to terminate normally. AFL will restart
+     the process with a clean slate for allocated memory, file descriptors, etc.
+  */
   return 0;
 }
\ No newline at end of file