/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at 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 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 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <stdlib.h>
#include <errno.h>
#include "euro.h"


void *
_icv_open()
{
        return ((void *) MAGIC_NUMBER);
}


void
_icv_close(int *cd)
{
        if (! cd || cd != (int *)MAGIC_NUMBER)
                errno = EBADF;
}


size_t
_icv_iconv(int *cd, char **inbuf, size_t *inbytesleft,
                char **outbuf, size_t *outbytesleft)
{
        size_t ret_val;
        unsigned char c;
        unsigned char *ib;
        unsigned char *ob;
        unsigned char *ibtail;
        unsigned char *obtail;

        if (cd != (int *)MAGIC_NUMBER) {
                errno = EBADF;
                return ((size_t)-1);
        }

        if (!inbuf || !(*inbuf))
                return ((size_t)0);

        ret_val = 0;
        ib = (unsigned char *)*inbuf;
        ob = (unsigned char *)*outbuf;
        ibtail = ib + *inbytesleft;
        obtail = ob + *outbytesleft;

        while (ib < ibtail) {
                c = *ib;

                if (tbl[c].sz == ICV_TYPE_ILLEGAL_CHAR) {
                        errno = EILSEQ;
                        ret_val = (size_t)-1;
                        break;
                }

                if (obtail <= ob) {
                        errno = E2BIG;
                        ret_val = (size_t)-1;
                        break;
                }

                *ob++ = tbl[c].ch;
                ib++;
        }

        *inbuf = (char *)ib;
        *inbytesleft = ibtail - ib;
        *outbuf = (char *)ob;
        *outbytesleft = obtail - ob;

        return (ret_val);
}