attr_ewidth
width += attr_ewidth(attr[from]);
width += attr_ewidth(prev_attr);
w += attr_ewidth(attr[curr-1]);
static int attr_ewidth(int);
if (ctldisp != OPT_ON && column + w + attr_ewidth(a) > sc_width)
attr_ewidth(attr) > sc_width)
pwidth(' ', binattr, 0) + attr_ewidth(binattr) > sc_width)
pwidth(' ', binattr, 0) + attr_ewidth(binattr) > sc_width)