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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2001-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "erl_interface.h"
#include "erl_driver.h"
static ErlDrvPort my_erlang_port;
static ErlDrvData echo_start(ErlDrvPort, char *);
static void from_erlang(ErlDrvData, char*, ErlDrvSizeT);
static ErlDrvSSizeT do_call(ErlDrvData drv_data, unsigned int command,
char *buf, ErlDrvSizeT len, char **rbuf,
ErlDrvSizeT rlen, unsigned *ret_flags);
static ErlDrvEntry echo_driver_entry = {
NULL, /* Init */
echo_start,
NULL, /* Stop */
from_erlang,
NULL, /* Ready input */
NULL, /* Ready output */
"port_call_drv",
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
do_call,
NULL,
ERL_DRV_EXTENDED_MARKER,
ERL_DRV_EXTENDED_MAJOR_VERSION,
ERL_DRV_EXTENDED_MINOR_VERSION,
0,
NULL,
NULL,
NULL,
};
DRIVER_INIT(echo_drv)
{
return &echo_driver_entry;
}
static ErlDrvData
echo_start(ErlDrvPort port, char *buf)
{
return (ErlDrvData) port;
}
static void
from_erlang(ErlDrvData data, char *buf, ErlDrvSizeT count)
{
driver_output((ErlDrvPort) data, buf, count);
}
static ErlDrvSSizeT
do_call(ErlDrvData drv_data, unsigned int command, char *buf,
ErlDrvSizeT len, char **rbuf, ErlDrvSizeT rlen, unsigned *ret_flags)
{
int nlen;
ei_x_buff x;
switch (command) {
case 0:
*rbuf = buf;
*ret_flags |= DRIVER_CALL_KEEP_BUFFER;
return len;
case 1:
ei_x_new(&x);
ei_x_format(&x, "{[], a, [], b, c}");
nlen = x.index;
if (nlen > rlen) {
*rbuf =driver_alloc(nlen);
}
memcpy(*rbuf,x.buff,nlen);
ei_x_free(&x);
return nlen;
case 2:
ei_x_new(&x);
ei_x_encode_version(&x);
ei_x_encode_tuple_header(&x,2);
ei_x_encode_atom(&x,"return");
ei_x_append_buf(&x,buf+1,len-1);
nlen = x.index;
if (nlen > rlen) {
*rbuf =driver_alloc(nlen);
}
memcpy(*rbuf,x.buff,nlen);
ei_x_free(&x);
return nlen;
default:
return -1;
}
}
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