demo codes to test Gist

clips.c

// hooks for future customizing 
typedef int (db_log_fnc)(const char *fmt, ... );
typedef void* (db_malloc_fnc)(size_t sz);
typedef void* (db_realloc_fnc)(void *ptr, size_t sz);
typedef void (db_free_fnc)(void *ptr);
typedef void (db_exit_fnc)(int status);

struct _db_hook
{
  db_log_fnc *log;
  db_malloc_fnc *malloc;
  db_realloc_fnc *realloc;
  db_free_fnc *free;
  db_exit_fnc *exit;
};