31 	return idx >= ws->len ? idx - ws->len : idx;  in idx_mod()
37 	return idx_mod(ws, a + (ws->len - b));  in idx_sub()
41 			 const char *data, uint32_t len)  in sys_winstream_write()  argument
43 	uint32_t len0 = len, suffix;  in sys_winstream_write()
50 	if (len > ws->len - 1) {  in sys_winstream_write()
52 		len = ws->len - 1;  in sys_winstream_write()
58 	len = MIN(len, ws->len);  in sys_winstream_write()
60 		uint32_t avail = (ws->len - 1) - idx_sub(ws, end, start);  in sys_winstream_write()
62 		if (len > avail) {  in sys_winstream_write()
63 			ws->start = idx_mod(ws, start + (len - avail));  in sys_winstream_write()
69 	if (len < len0) {  in sys_winstream_write()
71 		data += len0 - len;  in sys_winstream_write()
74 	suffix = MIN(len, ws->len - end);  in sys_winstream_write()
76 	if (len > suffix) {  in sys_winstream_write()
77 		MEMCPY(&ws->data[0], data + suffix, len - 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
112 		len = MIN(buflen, behind);  in sys_winstream_read()
113 		suffix = MIN(len, ws->len - copy);  in sys_winstream_read()
115 		if (len > suffix) {  in sys_winstream_read()
116 			MEMCPY(buf + suffix, &ws->data[0], len - suffix);  in sys_winstream_read()
118 		*seq = seq0 + len;  in sys_winstream_read()
128 	return len;  in sys_winstream_read()