44 	uint32_t start = ws->start, end = ws->end, seq = ws->seq;  in sys_winstream_write()  local
47 	 * (Max bytes buffered is actually len-1 because start==end is  in sys_winstream_write()
51 		start = end;  in sys_winstream_write()
60 		uint32_t avail = (ws->len - 1) - idx_sub(ws, end, start);  in sys_winstream_write()
70 		ws->start = end;  in sys_winstream_write()
74 	suffix = MIN(len, ws->len - end);  in sys_winstream_write()
75 	MEMCPY(&ws->data[end], data, suffix);  in sys_winstream_write()
80 	ws->end = idx_mod(ws, end + len);  in sys_winstream_write()
88 	uint32_t seq0 = *seq, start, end, wseq, len, behind, copy, suffix;  in sys_winstream_read()  local
91 		start = ws->start; end = ws->end; wseq = ws->seq;  in sys_winstream_read()
95 		if (*seq == wseq || start == end) {  in sys_winstream_read()
105 		if (behind > idx_sub(ws, ws->end, ws->start)) {  in sys_winstream_read()
111 		copy = idx_sub(ws, ws->end, behind);  in sys_winstream_read()