4.3BSD-Reno/src/lib/libpc/UNIT.c

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/*-
 * Copyright (c) 1979 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)UNIT.c	1.3 (Berkeley) 4/9/90";
#endif /* not lint */

#include "h00vars.h"

struct iorec *
UNIT(curfile)

	register struct iorec	*curfile;
{
	if (curfile->fblk >= MAXFILES || _actfile[curfile->fblk] != curfile) {
		ERROR("Reference to an inactive file\n", 0);
		return;
	}
	if (curfile->funit & FDEF) {
		ERROR("%s: Reference to an inactive file\n", curfile->pfname);
		return;
	}
	return curfile;
}