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/*
* 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 (c) 1994 by Sun Microsystems, Inc.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#define MSB 0x80
enum _GSTATE { G0, G1, G2};
typedef struct _icv_state {
char _lastc;
short _gstate;
} _iconv_st;
/*
* Open; called from iconv_open()
*/
void *
_icv_open()
{
_iconv_st *st;
if ((st = (_iconv_st *)malloc(sizeof(_iconv_st))) == NULL) {
errno = ENOMEM;
return ((void *) -1);
}
st->_gstate = G0;
return ((void *)st);
}
/*
* Close; called from iconv_close()
*/
void
_icv_close(_iconv_st *st)
{
if (st == NULL)
errno = EBADF;
else
free(st);
}
/*
* Actual conversion; called from iconv()
*/
/*=======================================================================
*
*
* +-------------------------------------+
* V MSB MSB ascii |
* +-> G0 ------------> G1 ------> G2 -------+
* | ascii (~{) ^ MSB | (~})
* +----+ +----------+
*=======================================================================*/
size_t
_icv_iconv(_iconv_st *st, char **inbuf, size_t*inbytesleft,
char **outbuf, size_t*outbytesleft)
{
if (st == NULL) {
errno = EBADF;
return -1;
}
if (inbuf == NULL || *inbuf == NULL) { /* Reset request. */
st->_gstate = G0;
return 0;
}
errno = 0;
while (*inbytesleft > 0 && *outbytesleft > 0) {
switch (st->_gstate) {
case G0:
if ( **inbuf & MSB ) {
if(*outbytesleft >=2) {
**outbuf = '~';
*(*outbuf+1) = '{';
(*outbuf) += 2, (*outbytesleft) -= 2;
st->_lastc = **inbuf;
st->_gstate = G1;
} else {
errno = E2BIG;
return (size_t)-1;
}
} else {
**outbuf = **inbuf;
(*outbuf)++, (*outbytesleft)--;
if (**inbuf == '~') {
**outbuf = '~';
(*outbuf)++, (*outbytesleft)--;
}
}
break;
case G1:
if ( **inbuf & MSB ) {
if(*outbytesleft >=2) {
**outbuf = st->_lastc - 0x80;
*(*outbuf+1) = **inbuf - 0x80;
(*outbuf) += 2, (*outbytesleft) -= 2;
st->_gstate = G2;
} else {
errno = E2BIG;
return (size_t)-1;
}
} else {
errno = E2BIG;
return (size_t)-1;
}
break;
case G2:
if ( **inbuf & MSB ) {
st->_lastc = **inbuf;
st->_gstate = G1;
} else {
if(*outbytesleft >=3) {
**outbuf = '~';
*(*outbuf+1) = '}';
*(*outbuf+2) = **inbuf;
(*outbuf) += 3, (*outbytesleft) -= 3;
st->_gstate = G0;
}else {
errno = E2BIG;
return (size_t)-1;
}
}
break;
}
(*inbuf)++, (*inbytesleft)--;
if (errno)
return -1;
}
if (*inbytesleft > 0 && *outbytesleft == 0) {
errno = E2BIG;
return -1;
}
return (*inbytesleft);
}
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