/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Data Link API - Receive Data
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/types.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/dlpi.h>
#include <dluser.h>
#include <dlhdr.h>

extern struct dl_descriptor *_getdesc();

int
dl_rcv(int fd, char *buff, int *bufflen, struct dl_address *addr)
{
	struct dl_descriptor *dl;
	struct strbuf ctl, data;
	int flags = 0;

	if ((dl = _getdesc(fd)) != NULL) {
		unsigned char pbuff[sizeof (union DL_primitives)+24];
		union DL_primitives *prim = (union DL_primitives *)pbuff;
		int len;
		unsigned char *ap, *addrp;

		if (dl->info.state != DLSTATE_IDLE) {
			dl->error = DLUNBOUND;
			return (-1);
		}
		memset(prim, '\0', sizeof (prim));
		ctl.maxlen = ctl.len = sizeof (pbuff);
		ctl.buf = (char *)prim;
		data.maxlen = data.len = *bufflen;
		data.buf = buff;
		flags = 0;
		if (getmsg(fd, &ctl, &data, &flags) < 0) {
			dl->error = DLSYSERR;
			return (-1);
		}
		if (ctl.len == 0) {
				/* not really supported but ok */
			*bufflen = 0;
			return (0);
		}
		switch (prim->dl_primitive) {
		case DL_UNITDATA_IND:
			if (addr->dla_dmax > 0) {
				for (addr->dla_dlen = len =
				    prim->unitdata_ind.dl_dest_addr_length,
				    addrp = addr->dla_daddr,
				    ap = ((unsigned char *)prim) +
				    prim->unitdata_ind.dl_dest_addr_offset;
				    len > 0; len--)
					*addrp++ = *ap++;
#if !defined(DLPI_1)
				addr->dla_dflag =
				    prim->unitdata_ind.dl_group_address;
#endif
			}
			if (addr->dla_smax > 0) {
				for (addr->dla_slen = len =
				    prim->unitdata_ind.dl_src_addr_length,
				    addrp = addr->dla_saddr,
				    ap = ((unsigned char *)prim) +
				    prim->unitdata_ind.dl_src_addr_offset;
				    len > 0; len--)
					*addrp++ = *ap++;
			}
			*bufflen = data.len;
			break;
		default:
			dl->error = DLOUTSTATE;
			return (-1);
		}
		return (0);
	}
	return (-1);
}