[unix-history] / portlib / rew.c

# 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;

	}
}
Commit	Line	Data
520d5775 EA	1	# include "iodec.h"
	2
	3	/**
	4	** rewind a file
	5	**/
	6
	7	rew(fn)
	8	int fn;
	9	{
	10	register struct fileps *fp;
	11
	12	if (fn < 0 \|\| fn >= MAXFILES)
	13	__error("rew: bad file number %d", fn);
	14	fp = &__filehdr[fn];
	15	if (fp->wrflag == 0)
	16	return;
	17	switch (fp->wrflag)
	18	{
	19
	20	case 3:
	21	fp->wrflag = 2;
	22	return;
	23
	24	case 4: /* modify */
	25	case 2: /* write */
	26	cflush(fn);
	27
	28	case 1: /* read */
	29	fp->nchars = fp->eoferr = 0;
	30	seek(fn, 0, 0);
	31	return;
	32
	33	}
	34	}