/*
 * 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.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

#include "uucp.h"

#define MSYNC   '\020'
/* maximum likely message - make sure you don't get run away input */
#define MAXIMSG 256

/*
 * read message routine used before a
 * protocol is agreed upon.
 *      msg     -> address of input buffer
 *      fn      -> input file descriptor
 * returns:
 *      EOF     -> no more messages
 *      0       -> message returned
 */
int
imsg(msg, fn)
char *msg;
int fn;
{
        char c;
        int i;
        short fndsync;
        char *bmsg;

        fndsync = 0;
        bmsg = msg;
        CDEBUG(7, "imsg %s>", "");
        while ((i = (*Read)(fn, msg, sizeof(char))) == sizeof(char)) {
                *msg &= 0177;
                c = *msg;
                CDEBUG(7, "%s", c < 040 ? "^" : "");
                CDEBUG(7, "%c", c < 040 ? c | 0100 : c);
                if (c == MSYNC) { /* look for sync character */
                        msg = bmsg;
                        fndsync = 1;
                        continue;
                }
                if (!fndsync)
                        continue;

                if (c == '\0' || c == '\n') {
                        *msg = '\0';
                        return(0);
                }
                else
                        msg++;

                if (msg - bmsg > MAXIMSG)       /* unlikely */
                        return(FAIL);
        }
        /* have not found sync or end of message */
        if (i < 0) {
                CDEBUG(7, "\nimsg read error: %s\n", strerror(errno));
        }
        *msg = '\0';
        return(EOF);
}

/*
 * initial write message routine -
 * used before a protocol is agreed upon.
 *      type    -> message type
 *      msg     -> message body address
 *      fn      -> file descriptor
 * return:
 *      Must always return 0 - wmesg (WMESG) looks for zero
 */
int
omsg(type, msg, fn)
char *msg;
char type;
int fn;
{
        char buf[BUFSIZ];

        (void) sprintf(buf, "%c%c%s", MSYNC, type, msg);
        DEBUG( 7, "omsg \"%s\"\n", &buf[1] );
        (*Write)(fn, buf, strlen(buf) + 1);
        return(0);
}

/*
 * null turnoff routine to be used for errors
 * during protocol selection.
 */
int
turnoff(void)
{
        return(0);
}