22 	size_t left;  member
27 	if (s->left) {  in membuf_zero()
28 		if (size > s->left)  in membuf_zero()
29 			size = s->left;  in membuf_zero()
32 		s->left -= size;  in membuf_zero()
34 	return s->left;  in membuf_zero()
39 	if (s->left) {  in membuf_write()
40 		if (size > s->left)  in membuf_write()
41 			size = s->left;  in membuf_write()
44 		s->left -= size;  in membuf_write()
46 	return s->left;  in membuf_write()
53         if (__s->left) {				\
56 		if (unlikely(__size > __s->left)) {	\
57 			__size = __s->left;		\
63 		__s->left -= __size;			\
65 	__s->left;})