# include "iodec.h" /** ** rewind a file **/ rew(fn) int fn; { register struct fileps *fp; if (fn < 0 || fn >= MAXFILES) __error("rew: bad file number %d", fn); fp = &__filehdr[fn]; if (fp->wrflag == 0) return; switch (fp->wrflag) { case 3: fp->wrflag = 2; return; case 4: /* modify */ case 2: /* write */ cflush(fn); case 1: /* read */ fp->nchars = fp->eoferr = 0; seek(fn, 0, 0); return; } }