#ifndef _STDARG_H
#define _STDARG_H

typedef char* va_list;
#define _FP     1
#define _INT    0
#define _STRUCT 2

#define _VA_FP_SAVE_AREA    0x10
#define _VA_ALIGN(p, a)     (((unsigned int)(((char*)p) + ((a) > 4 ? (a) : 4) - 1)) & -((a) > 4 ? (a) : 4))
#define va_start(vp, parmN) (vp = ((va_list) & parmN + sizeof(parmN)))

#define __va_stack_arg(list, mode)                                                                                     \
    (((list) = (char*)_VA_ALIGN(list, __builtin_alignof(mode)) + _VA_ALIGN(sizeof(mode), 4)),                          \
     (((char*)list) - (_VA_ALIGN(sizeof(mode), 4) - sizeof(mode))))

#define __va_double_arg(list, mode)                                                                                    \
    ((((long)list & 0x1) /* 1 byte aligned? */                                                                         \
          ? (list = (char*)((long)list + 7), (char*)((long)list - 6 - _VA_FP_SAVE_AREA))                               \
          : (((long)list & 0x2) /* 2 byte aligned? */                                                                  \
                 ? (list = (char*)((long)list + 10), (char*)((long)list - 24 - _VA_FP_SAVE_AREA))                      \
                 : __va_stack_arg(list, mode))))

#define va_arg(list, mode)                                                                                             \
    ((mode*)(((__builtin_classof(mode) == _FP && __builtin_alignof(mode) == sizeof(double))                            \
                  ? __va_double_arg(list, mode)                                                                        \
                  : __va_stack_arg(list, mode))))[-1]
#define va_end(__list)

#endif /* STDARG_H */
