COL_OFF
scno += COL_OFF(scno, ts);
for (; cno + COL_OFF(cno, ts) <= scno; ++tabs)
cno += COL_OFF(cno, ts);
scno += COL_OFF(scno, ts);
for (; cno + COL_OFF(cno, ts) <= scno; ++tabs)
cno += COL_OFF(cno, ts);
COL_OFF(current, ts) : KEY_LEN(sp, tp->lb[cno]);
target += COL_OFF(target, sw);
COL_OFF(current, ts) : KEY_LEN(sp, tp->lb[cno]);
for (; cno + COL_OFF(cno, ts) <= target; ++tabs)
cno += COL_OFF(cno, ts);
colwidth += COL_OFF(colwidth, 6);
#define TAB_OFF(c) COL_OFF((c), O_VAL(sp, O_TABSTOP))