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	static char	SCCSID[] = "@(#)dkxwrite.c	2.1 DKHOST 84/08/28";

#include "remfio.h"
#include <stdio.h>
#include "sysexits.h"

	extern int	dkverbose;

/*
 * Write a length-preceeded block over a dkxqt protocol channel
 *
 *	netfd	= file descriptor to use
 *	addr	= character pointer to beginning of block
 *	len	= number of bytes in block
 *	return	= >0 : write successful
 *		| <0 : write failed
 */

dkxlwrite(netfd, addr, len)
	char			*addr;
{
	int			n;
	short			slen;
	char			clen[3];

	slen = len;

	dktcanon("s", &slen, clen);

	if((n = dkxwrite(netfd, clen, 2)) < 0)
		return(n);

	if(len > 0)
		n = dkxwrite(netfd, addr, len);

	return(n);
}

/*
 * Write a block over a dkxqt protocol channel
 *
 *	netfd	= file descriptor to use
 *	addr	= character pointer to beginning of block
 *	len	= number of bytes in block
 *	return	= >0 : write successful
 *		| <0 : write failed
 */

dkxwrite(netfd, addr, len)
	char			*addr;
{
	int			n;

	if((n = dkxpwrite(netfd, len)) < 0)
		return(n);

	return(write(netfd, addr, len));
}

/*
 * Prepare to write a block over a dkxqt protocol channel
 *
 * Write the protocol envelope necessary before sending the block itself
 *
 *	netfd	= file descriptor to use
 *	len	= number of bytes in block
 *	return	= >0 : write successful
 *		| <0 : write failed
 */

dkxpwrite(netfd, len)
{
	int			n;
	struct rem_req		r;
	struct rem_reply	s;
	char			sb[REMSIZE], rb[REMSIZE];

	n = read(netfd, rb, REMSIZE);
	dkfcanon(F_REMREQ, rb, &r);

	if(n != REMSIZE || r.r_type != RREAD || r.r_var.rread.r_count != len){
		if(dkverbose)
			fprintf(stderr, "dkxpwrite: REMREQ wrong\n");
		return(-EX_PROTOCOL);
	}

	s.s_type = RREAD;
	s.s_length = len;
	s.s_error = 0;
	s.s_resid = 0;
	dktcanon(F_REMREPLY, &s, sb) ;

	return(write(netfd, sb, REMSIZE));
}

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