OBUFSZ
if (obufp >= &obuf[OBUFSZ])
char obuf[OBUFSZ]; /* characters collected here for typesetter output */
#define oput(c) if ((*obufp++ = (c)), obufp >= &obuf[OBUFSZ]) flusho(); else
#define oput(c) if ((*obufp++ = (c)), obufp >= &obuf[OBUFSZ]) flusho(); else
#define oput(c) if ((*obufp++ = cbits(c) & BYTEMASK), obufp >= &obuf[OBUFSZ]) flusho(); else