_whsp_end
v = _whsp_end(Buf(c), (int) SizePrev(c, t));
v = _whsp_end(vbeg, (int)(v - vbeg));
v = _whsp_end(vbeg, Xmax(f));
_adjust_cursor(f, _whsp_end(y, X(f)));
extern char * _whsp_end(char *, int);