201 lines
7.1 KiB
C
201 lines
7.1 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2004-2012 Broadcom Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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/******************************************************************************
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*
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* BTA AG AT command interpreter.
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*
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******************************************************************************/
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#include <string.h>
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#include "osi/allocator.h"
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#include "bta_ag_at.h"
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#include "bta/utl.h"
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#if (BTA_AG_INCLUDED == TRUE)
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/******************************************************************************
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**
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** Function bta_ag_at_init
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**
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** Description Initialize the AT command parser control block.
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**
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**
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** Returns void
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**
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******************************************************************************/
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void bta_ag_at_init(tBTA_AG_AT_CB *p_cb)
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{
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p_cb->p_cmd_buf = NULL;
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p_cb->cmd_pos = 0;
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}
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/******************************************************************************
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**
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** Function bta_ag_at_reinit
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**
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** Description Re-initialize the AT command parser control block. This
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** function resets the AT command parser state and frees
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** any GKI buffer.
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**
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**
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** Returns void
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**
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******************************************************************************/
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void bta_ag_at_reinit(tBTA_AG_AT_CB *p_cb)
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{
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if (p_cb->p_cmd_buf != NULL) {
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osi_free(p_cb->p_cmd_buf);
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p_cb->p_cmd_buf = NULL;
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}
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p_cb->cmd_pos = 0;
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}
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/******************************************************************************
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**
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** Function bta_ag_process_at
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**
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** Description Parse AT commands. This function will take the input
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** character string and parse it for AT commands according to
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** the AT command table passed in the control block.
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**
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**
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** Returns void
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**
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******************************************************************************/
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void bta_ag_process_at(tBTA_AG_AT_CB *p_cb)
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{
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UINT16 idx;
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UINT8 arg_type;
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char *p_arg;
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INT16 int_arg = 0;
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/* loop through at command table looking for match */
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for (idx = 0; p_cb->p_at_tbl[idx].p_cmd[0] != 0; idx++) {
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if (!utl_strucmp(p_cb->p_at_tbl[idx].p_cmd, p_cb->p_cmd_buf)) {
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break;
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}
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}
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/* if there is a match; verify argument type */
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if (p_cb->p_at_tbl[idx].p_cmd[0] != 0) {
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/* start of argument is p + strlen matching command */
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p_arg = p_cb->p_cmd_buf + strlen(p_cb->p_at_tbl[idx].p_cmd);
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/* if no argument */
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if (p_arg[0] == 0) {
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arg_type = BTA_AG_AT_NONE;
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}
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/* else if arg is '?' and it is last character */
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else if (p_arg[0] == '?' && p_arg[1] == 0) {
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arg_type = BTA_AG_AT_READ; /* we have a read */
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}
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/* else if arg is '=' */
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else if (p_arg[0] == '=' && p_arg[1] != 0) {
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if (p_arg[1] == '?' && p_arg[2] == 0) {
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arg_type = BTA_AG_AT_TEST; /* we have a test */
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} else {
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arg_type = BTA_AG_AT_SET; /* we have a set */
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p_arg++; /* skip past '=' */
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}
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}
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/* else it is freeform argument */
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else {
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arg_type = BTA_AG_AT_FREE;
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}
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/* if arguments match command capabilities */
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if ((arg_type & p_cb->p_at_tbl[idx].arg_type) != 0) {
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/* if it's a set integer check max, min range */
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if (arg_type == BTA_AG_AT_SET && p_cb->p_at_tbl[idx].fmt == BTA_AG_AT_INT) {
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int_arg = utl_str2int(p_arg);
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if (int_arg < (INT16) p_cb->p_at_tbl[idx].min ||
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int_arg > (INT16) p_cb->p_at_tbl[idx].max) {
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/* arg out of range; error */
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(*p_cb->p_err_cback)(p_cb->p_user, FALSE, NULL);
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} else {
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(*p_cb->p_cmd_cback)(p_cb->p_user, idx, arg_type, p_arg, int_arg);
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}
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} else {
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(*p_cb->p_cmd_cback)(p_cb->p_user, idx, arg_type, p_arg, int_arg);
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}
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} else {
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/* else error */
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(*p_cb->p_err_cback)(p_cb->p_user, FALSE, NULL);
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}
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} else {
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/* else no match call error callback */
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(*p_cb->p_err_cback)(p_cb->p_user, TRUE, p_cb->p_cmd_buf);
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}
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}
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/******************************************************************************
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**
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** Function bta_ag_at_parse
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**
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** Description Parse AT commands. This function will take the input
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** character string and parse it for AT commands according to
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** the AT command table passed in the control block.
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**
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**
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** Returns void
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**
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******************************************************************************/
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void bta_ag_at_parse(tBTA_AG_AT_CB *p_cb, char *p_buf, UINT16 len)
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{
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int i = 0;
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char* p_save;
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if (p_cb->p_cmd_buf == NULL) {
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if ((p_cb->p_cmd_buf = (char *) osi_malloc(p_cb->cmd_max_len)) == NULL) {
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APPL_TRACE_ERROR("%s: osi_malloc() failed allocation", __func__);
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return;
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}
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p_cb->cmd_pos = 0;
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}
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for (i = 0; i < len;) {
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while (p_cb->cmd_pos < p_cb->cmd_max_len-1 && i < len) {
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/* Skip null characters between AT commands. */
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if ((p_cb->cmd_pos == 0) && (p_buf[i] == 0)) {
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i++;
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continue;
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}
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p_cb->p_cmd_buf[p_cb->cmd_pos] = p_buf[i++];
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if ( p_cb->p_cmd_buf[p_cb->cmd_pos] == '\r' || p_cb->p_cmd_buf[p_cb->cmd_pos] == '\n') {
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p_cb->p_cmd_buf[p_cb->cmd_pos] = 0;
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if ((p_cb->cmd_pos > 2) &&
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(p_cb->p_cmd_buf[0] == 'A' || p_cb->p_cmd_buf[0] == 'a') &&
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(p_cb->p_cmd_buf[1] == 'T' || p_cb->p_cmd_buf[1] == 't')) {
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p_save = p_cb->p_cmd_buf;
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p_cb->p_cmd_buf += 2;
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bta_ag_process_at(p_cb);
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p_cb->p_cmd_buf = p_save;
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}
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p_cb->cmd_pos = 0;
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} else if( p_cb->p_cmd_buf[p_cb->cmd_pos] == 0x1A || p_cb->p_cmd_buf[p_cb->cmd_pos] == 0x1B) {
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p_cb->p_cmd_buf[++p_cb->cmd_pos] = 0;
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(*p_cb->p_err_cback)(p_cb->p_user, TRUE, p_cb->p_cmd_buf);
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p_cb->cmd_pos = 0;
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} else {
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++p_cb->cmd_pos;
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}
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}
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if (i < len) {
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p_cb->cmd_pos = 0;
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}
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}
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}
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#endif /* #if (BTA_AG_INCLUDED == TRUE) */ |