/*-
 * Copyright (c) 1979 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)UNSYNC.c	1.5 (Berkeley) 04/09/90";
#endif /* not lint */

#include "h00vars.h"

/*
 * push back last char read to prepare for formatted read
 */
UNSYNC(curfile)

	register struct iorec	*curfile;
{
	if (curfile->funit & FWRITE) {
		ERROR("%s: Attempt to read, but open for writing\n",
			curfile->pfname);
		return;
	}
	if (curfile->funit & EOFF) {
		ERROR("%s: Tried to read past end of file\n", curfile->pfname);
		return;
	}
	if ((curfile->funit & SYNC) == 0) {
		ungetc(*curfile->fileptr, curfile->fbuf);
	}
	curfile->funit &= ~EOLN;
	curfile->funit |= SYNC;
}