_bcs_skip_ws_len
z1.begin = _bcs_skip_ws_len(_region_head(r), &len);
z2.begin = _bcs_skip_ws_len(z1.end, &len);
p = _bcs_skip_ws_len(p, &len);
p = _bcs_skip_ws_len(q, &len);
line = _bcs_skip_ws_len(line, &len);
line = _bcs_skip_ws_len(p, &len);
cp = _bcs_skip_ws_len(cq, &len);
p = _bcs_skip_ws_len(q, &len);
p = _bcs_skip_ws_len(p, &len);
line = _bcs_skip_ws_len(line, &len);
line = _bcs_skip_ws_len(p, &len);
line = _bcs_skip_ws_len(p, &len);
s = _bcs_skip_ws_len((const char *)var, &lenvar);
p = _bcs_skip_ws_len(p, &len);