#ifndef lint
static const char	RCSid[] = "$Id: portio.c,v 2.6 2003/02/22 02:07:22 greg Exp $";
#endif
/*
 * Portable i/o for binary files
 *
 * External symbols declared in standard.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 <stdio.h>

#ifndef frexp
extern double  frexp();
#endif
#ifndef ldexp
extern double  ldexp();
#endif


void
putstr(s, fp)			/* write null-terminated string to fp */
register char  *s;
register FILE  *fp;
{
	do
		putc(*s, fp);
	while (*s++);
}


void
putint(i, siz, fp)		/* write a siz-byte integer to fp */
long  i;
register int  siz;
register FILE  *fp;
{
	while (siz--)
		putc((int)(i>>(siz<<3) & 0xff), fp);
}


void
putflt(f, fp)			/* put out floating point number */
double	f;
FILE  *fp;
{
	int  e;

	putint((long)(frexp(f,&e)*0x7fffffff), 4, fp);
	putint((long)e, 1, fp);
}


char *
getstr(s, fp)			/* get null-terminated string */
char  *s;
register FILE  *fp;
{
	register char  *cp;
	register int  c;

	cp = s;
	while ((c = getc(fp)) != EOF)
		if ((*cp++ = c) == '\0')
			return(s);
		
	return(NULL);
}


long
getint(siz, fp)			/* get a siz-byte integer */
int  siz;
register FILE  *fp;
{
	register int  c;
	register long  r;

	if ((c = getc(fp)) == EOF)
		return(EOF);
	r = 0x80&c ? -1<<8|c : c;		/* sign extend */
	while (--siz > 0) {
		if ((c = getc(fp)) == EOF)
			return(EOF);
		r <<= 8;
		r |= c;
	}
	return(r);
}


double
getflt(fp)			/* get a floating point number */
FILE  *fp;
{
	long	l;
	double	d;

	l = getint(4, fp);
	d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff);
	return(ldexp(d, (int)getint(1, fp)));
}