binary7.c

#include <stdio.h>
#include <stdlib.h>
char username[512] = {1};
void (*_atexit)(int) =  exit;
void cp_username(char *name, const char *arg)
{
  while((*(name++) = *(arg++)));
  *name = 0;
}
int main(int argc, char **argv)
{
  if(argc != 2)
    {
      printf("[-] Usage : %s <username>\n", argv[0]);
      exit(0);
    }
   
  cp_username(username, argv[1]);
  printf("[+] Running program with username : %s\n", username);
   
  _atexit(0);
  return 0;
}