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


#ident  "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.9   */
/* LINTLIBRARY */

# include       <stdarg.h>
# include       <string.h>
# include       <errno.h>

# include       "msgs.h"

extern char     *_lp_msg_fmts[];
extern int      errno;

/* VARARGS */
#if     defined(__STDC__)
int _getmessage ( char * buf, short rtype, va_list arg )
#else
int _getmessage (buf, rtype, arg)
    char        *buf;
    short       rtype;
    va_list     arg;
#endif
{
    char        *endbuf;
    char        *fmt;
    char        **t_string;
    int         temp = 0;
    long        *t_long;
    short       *t_short;
    short       etype;

    if (buf == (char *)0)
    {
        errno = ENOSPC;
        return(-1);
    }

    /*
     * We assume that we're given a buffer big enough to hold
     * the header.
     */

    endbuf = buf + (long)stoh(buf);
    if ((buf + MESG_DATA) > endbuf)
    {
        errno = ENOMSG;
        return(-1);
    }

    etype = stoh(buf + MESG_TYPE);
    if (etype < 0 || etype > LAST_MESSAGE)
    {
        errno = EBADMSG;
        return(-1);
    }

    if (etype != rtype)
    {
        if (rtype > 0 && rtype <= LAST_MESSAGE)
            fmt = _lp_msg_fmts[rtype];
        else
        {
            errno = EINVAL;
            return(-1);
        }
    }
    else
        fmt = _lp_msg_fmts[etype];

    buf += MESG_LEN;

    while (*fmt != '\0')
        switch(*fmt++)
        {
            case 'H':
                if ((buf + 4) > endbuf)
                {
                    errno = ENOMSG;
                    return(-1);
                }

                t_short = va_arg(arg, short *);
                *t_short = stoh(buf);
                buf += 4;
                break;

            case 'L':
                if ((buf + 8) > endbuf)
                {
                    errno = ENOMSG;
                    return(-1);
                }

                t_long = va_arg(arg, long *);
                *t_long = stol(buf);
                buf += 8;
                break;

            case 'D':
                if ((buf + 4) > endbuf)
                {
                    errno = ENOMSG;
                    return(-1);
                }

                t_short = va_arg(arg, short *);
                *t_short = stoh(buf);
                buf += 4;
                t_string = va_arg(arg, char **);
                if ((buf + *t_short) > endbuf)
                {
                    errno = ENOMSG;
                    return(-1);
                }
                (*t_short)--;           /* Don't mention the null we added */
                *t_string = buf;
                buf += *t_short;
                break;

            case 'S':
                if ((buf + 4) > endbuf)
                {
                    errno = ENOMSG;
                    return(-1);
                }

                t_string = va_arg(arg, char **);
                temp = stoh(buf);
                buf += 4;
                if ((buf + temp) > endbuf)
                {
                    errno = ENOMSG;
                    return(-1);
                }

                *t_string = buf;
                buf += temp;
                break;
        }
    return(etype);
}