#define __VA_ALIGNED_SIZE(x) ((sizeof(x) + sizeof(int) - 1) & ~(sizeof(int) - 1)) #define va_start(ap, last) ((ap) = (void *)(((char *)&(last)) + __VA_ALIGNED_SIZE(last))) #define va_end(ap) ((void)0) #define va_copy(dest, src) ((dest) = (src)) #define va_arg(ap, type) \ ( ((ap) = (va_list)((char *)(ap) + __VA_ALIGNED_SIZE(type))), \ *(type *)(void *)((char *)(ap) - __VA_ALIGNED_SIZE(type)) )