#ifndef lint
static const char	RCSid[] = "$Id: duphead.c,v 2.3 2003/02/22 02:07:28 greg Exp $";
#endif
/*
 * Duplicate header on stdout.
 *
 * Externals declared in ray.h
 */

/* ====================================================================
 * The Radiance Software License, Version 1.0
 *
 * Copyright (c) 1990 - 2002 The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory.   All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *         notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *           if any, must include the following acknowledgment:
 *             "This product includes Radiance software
 *                 (http://radsite.lbl.gov/)
 *                 developed by the Lawrence Berkeley National Laboratory
 *               (http://www.lbl.gov/)."
 *       Alternately, this acknowledgment may appear in the software itself,
 *       if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
 *       and "The Regents of the University of California" must
 *       not be used to endorse or promote products derived from this
 *       software without prior written permission. For written
 *       permission, please contact radiance@radsite.lbl.gov.
 *
 * 5. Products derived from this software may not be called "Radiance",
 *       nor may "Radiance" appear in their name, without prior written
 *       permission of Lawrence Berkeley National Laboratory.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.   IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
 * information on Lawrence Berkeley National Laboratory, please see
 * <http://www.lbl.gov/>.
 */

#include  "standard.h"
#include  "paths.h"


int  headismine = 1;		/* true if header file belongs to me */

static char  *headfname = NULL;	/* temp file name */
static FILE  *headfp = NULL;	/* temp file pointer */


void
headclean()			/* remove header temp file (if one) */
{
	if (headfname == NULL)
		return;
	if (headfp != NULL)
		fclose(headfp);
	if (headismine)
		unlink(headfname);
}


void
openheader()			/* save standard output to header file */
{
	static char  template[] = TEMPLATE;

	headfname = mktemp(template);
	if (freopen(headfname, "w", stdout) == NULL) {
		sprintf(errmsg, "cannot open header file \"%s\"", headfname);
		error(SYSTEM, errmsg);
	}
}


void
dupheader()			/* repeat header on standard output */
{
	register int  c;

	if (headfp == NULL) {
		if ((headfp = fopen(headfname, "r")) == NULL)
			error(SYSTEM, "error reopening header file");
#ifdef MSDOS
		setmode(fileno(headfp), O_BINARY);
#endif
	} else if (fseek(headfp, 0L, 0) < 0)
		error(SYSTEM, "seek error on header file");
	while ((c = getc(headfp)) != EOF)
		putchar(c);
}