kSPStart
if ((flags & kSPStart) != 0) {
*flagp |= flags&kSPStart;
*flagp |= flags&kSPStart;
*flagp |= flags & kSPStart;
*flagp = op != '+' ? kWorst | kSPStart : kWorst | kHasWidth;
*flagp |= flags & (kHasWidth | kSPStart);