Observez le code ci-dessous :

#define MAX_LEN 4096
/*!
 * @brief function make_path concatenates a dirname and a filename to provide a full path to file
 * @param path_to string containing the directory of the file (NULL if file is in current dir)
 * @param file_name the file basename (shall not be NULL)
 * @return a pointer to the full path, allocated by the function and freed by its caller.
 */
char *make_path(char *path_to, char *file_name) {
	char *full_path = malloc(sizeof(char) * MAX_LEN);
  if (!path_to) {
  	strcpy(full_path, file_name);
    return full_path;
  }
  if (!file_name)
  	return NULL;
  strcpy(full_path, path_to);
  strcat(full_path, "/");
  strcat(full_path, file_name);
  return full_path;
}

Que va-t-il se passer si la fonction est appelée avec path_to ayant une valeur et file_name étant NULL ?