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/******************************************************************************
*
* Copyright (C) 2004-2012 Broadcom Corporation
*
* 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.
*
******************************************************************************/
/******************************************************************************
*
* BTA AG AT command interpreter.
*
******************************************************************************/
#include <string.h>
#include "gki.h"
#include "bta_ag_at.h"
#include "utl.h"
/*****************************************************************************
** Constants
*****************************************************************************/
/******************************************************************************
**
** Function bta_ag_at_init
**
** Description Initialize the AT command parser control block.
**
**
** Returns void
**
******************************************************************************/
void bta_ag_at_init(tBTA_AG_AT_CB *p_cb)
{
p_cb->p_cmd_buf = NULL;
p_cb->cmd_pos = 0;
}
/******************************************************************************
**
** Function bta_ag_at_reinit
**
** Description Re-initialize the AT command parser control block. This
** function resets the AT command parser state and frees
** any GKI buffer.
**
**
** Returns void
**
******************************************************************************/
void bta_ag_at_reinit(tBTA_AG_AT_CB *p_cb)
{
if (p_cb->p_cmd_buf != NULL)
{
GKI_freebuf(p_cb->p_cmd_buf);
p_cb->p_cmd_buf = NULL;
}
p_cb->cmd_pos = 0;
}
/******************************************************************************
**
** Function bta_ag_process_at
**
** Description Parse AT commands. This function will take the input
** character string and parse it for AT commands according to
** the AT command table passed in the control block.
**
**
** Returns void
**
******************************************************************************/
void bta_ag_process_at(tBTA_AG_AT_CB *p_cb)
{
UINT16 idx;
UINT8 arg_type;
char *p_arg;
INT16 int_arg = 0;
/* loop through at command table looking for match */
for (idx = 0; p_cb->p_at_tbl[idx].p_cmd[0] != 0; idx++)
{
if (!utl_strucmp(p_cb->p_at_tbl[idx].p_cmd, p_cb->p_cmd_buf))
{
break;
}
}
/* if there is a match; verify argument type */
if (p_cb->p_at_tbl[idx].p_cmd[0] != 0)
{
/* start of argument is p + strlen matching command */
p_arg = p_cb->p_cmd_buf + strlen(p_cb->p_at_tbl[idx].p_cmd);
/* if no argument */
if (p_arg[0] == 0)
{
arg_type = BTA_AG_AT_NONE;
}
/* else if arg is '?' and it is last character */
else if (p_arg[0] == '?' && p_arg[1] == 0)
{
/* we have a read */
arg_type = BTA_AG_AT_READ;
}
/* else if arg is '=' */
else if (p_arg[0] == '=' && p_arg[1] != 0)
{
if (p_arg[1] == '?' && p_arg[2] == 0)
{
/* we have a test */
arg_type = BTA_AG_AT_TEST;
}
else
{
/* we have a set */
arg_type = BTA_AG_AT_SET;
/* skip past '=' */
p_arg++;
}
}
else
/* else it is freeform argument */
{
arg_type = BTA_AG_AT_FREE;
}
/* if arguments match command capabilities */
if ((arg_type & p_cb->p_at_tbl[idx].arg_type) != 0)
{
/* if it's a set integer check max, min range */
if (arg_type == BTA_AG_AT_SET &&
p_cb->p_at_tbl[idx].fmt == BTA_AG_AT_INT)
{
int_arg = utl_str2int(p_arg);
if (int_arg < (INT16) p_cb->p_at_tbl[idx].min ||
int_arg > (INT16) p_cb->p_at_tbl[idx].max)
{
/* arg out of range; error */
(*p_cb->p_err_cback)(p_cb->p_user, FALSE, NULL);
}
else
{
(*p_cb->p_cmd_cback)(p_cb->p_user, idx, arg_type, p_arg, int_arg);
}
}
else
{
(*p_cb->p_cmd_cback)(p_cb->p_user, idx, arg_type, p_arg, int_arg);
}
}
/* else error */
else
{
(*p_cb->p_err_cback)(p_cb->p_user, FALSE, NULL);
}
}
/* else no match call error callback */
else
{
(*p_cb->p_err_cback)(p_cb->p_user, TRUE, p_cb->p_cmd_buf);
}
}
/******************************************************************************
**
** Function bta_ag_at_parse
**
** Description Parse AT commands. This function will take the input
** character string and parse it for AT commands according to
** the AT command table passed in the control block.
**
**
** Returns void
**
******************************************************************************/
void bta_ag_at_parse(tBTA_AG_AT_CB *p_cb, char *p_buf, UINT16 len)
{
int i = 0;
char* p_save;
if (p_cb->p_cmd_buf == NULL)
{
p_cb->p_cmd_buf = (char *) GKI_getbuf(p_cb->cmd_max_len);
p_cb->cmd_pos = 0;
}
for (i = 0; i < len;)
{
while (p_cb->cmd_pos < p_cb->cmd_max_len-1 && i < len)
{
/* Skip null characters between AT commands. */
if ((p_cb->cmd_pos == 0) && (p_buf[i] == 0))
{
i++;
continue;
}
p_cb->p_cmd_buf[p_cb->cmd_pos] = p_buf[i++];
if ( p_cb->p_cmd_buf[p_cb->cmd_pos] == '\r' || p_cb->p_cmd_buf[p_cb->cmd_pos] == '\n')
{
p_cb->p_cmd_buf[p_cb->cmd_pos] = 0;
if ((p_cb->cmd_pos > 2) &&
(p_cb->p_cmd_buf[0] == 'A' || p_cb->p_cmd_buf[0] == 'a') &&
(p_cb->p_cmd_buf[1] == 'T' || p_cb->p_cmd_buf[1] == 't'))
{
p_save = p_cb->p_cmd_buf;
p_cb->p_cmd_buf += 2;
bta_ag_process_at(p_cb);
p_cb->p_cmd_buf = p_save;
}
p_cb->cmd_pos = 0;
}
else if( p_cb->p_cmd_buf[p_cb->cmd_pos] == 0x1A || p_cb->p_cmd_buf[p_cb->cmd_pos] == 0x1B )
{
p_cb->p_cmd_buf[++p_cb->cmd_pos] = 0;
(*p_cb->p_err_cback)(p_cb->p_user, TRUE, p_cb->p_cmd_buf);
p_cb->cmd_pos = 0;
}
else
{
++p_cb->cmd_pos;
}
}
if (i < len)
p_cb->cmd_pos = 0;
}
}
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