Hemant Gupta | 3fe1b49 | 2014-04-29 16:23:59 +0530 | [diff] [blame^] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright (C) 2004-2012 Broadcom Corporation |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at: |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | ******************************************************************************/ |
| 18 | |
| 19 | /****************************************************************************** |
| 20 | * |
| 21 | * BTA AG AT command interpreter. |
| 22 | * |
| 23 | ******************************************************************************/ |
| 24 | |
| 25 | #include <string.h> |
| 26 | #include "gki.h" |
| 27 | #include "bta_ag_at.h" |
| 28 | #include "utl.h" |
| 29 | |
| 30 | /***************************************************************************** |
| 31 | ** Constants |
| 32 | *****************************************************************************/ |
| 33 | |
| 34 | /****************************************************************************** |
| 35 | ** |
| 36 | ** Function bta_ag_at_init |
| 37 | ** |
| 38 | ** Description Initialize the AT command parser control block. |
| 39 | ** |
| 40 | ** |
| 41 | ** Returns void |
| 42 | ** |
| 43 | ******************************************************************************/ |
| 44 | void bta_ag_at_init(tBTA_AG_AT_CB *p_cb) |
| 45 | { |
| 46 | p_cb->p_cmd_buf = NULL; |
| 47 | p_cb->cmd_pos = 0; |
| 48 | } |
| 49 | |
| 50 | /****************************************************************************** |
| 51 | ** |
| 52 | ** Function bta_ag_at_reinit |
| 53 | ** |
| 54 | ** Description Re-initialize the AT command parser control block. This |
| 55 | ** function resets the AT command parser state and frees |
| 56 | ** any GKI buffer. |
| 57 | ** |
| 58 | ** |
| 59 | ** Returns void |
| 60 | ** |
| 61 | ******************************************************************************/ |
| 62 | void bta_ag_at_reinit(tBTA_AG_AT_CB *p_cb) |
| 63 | { |
| 64 | if (p_cb->p_cmd_buf != NULL) |
| 65 | { |
| 66 | GKI_freebuf(p_cb->p_cmd_buf); |
| 67 | p_cb->p_cmd_buf = NULL; |
| 68 | } |
| 69 | p_cb->cmd_pos = 0; |
| 70 | } |
| 71 | /****************************************************************************** |
| 72 | ** |
| 73 | ** Function bta_ag_process_at |
| 74 | ** |
| 75 | ** Description Parse AT commands. This function will take the input |
| 76 | ** character string and parse it for AT commands according to |
| 77 | ** the AT command table passed in the control block. |
| 78 | ** |
| 79 | ** |
| 80 | ** Returns void |
| 81 | ** |
| 82 | ******************************************************************************/ |
| 83 | void bta_ag_process_at(tBTA_AG_AT_CB *p_cb) |
| 84 | { |
| 85 | UINT16 idx; |
| 86 | UINT8 arg_type; |
| 87 | char *p_arg; |
| 88 | INT16 int_arg = 0; |
| 89 | /* loop through at command table looking for match */ |
| 90 | for (idx = 0; p_cb->p_at_tbl[idx].p_cmd[0] != 0; idx++) |
| 91 | { |
| 92 | if (!utl_strucmp(p_cb->p_at_tbl[idx].p_cmd, p_cb->p_cmd_buf)) |
| 93 | { |
| 94 | break; |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | /* if there is a match; verify argument type */ |
| 99 | if (p_cb->p_at_tbl[idx].p_cmd[0] != 0) |
| 100 | { |
| 101 | /* start of argument is p + strlen matching command */ |
| 102 | p_arg = p_cb->p_cmd_buf + strlen(p_cb->p_at_tbl[idx].p_cmd); |
| 103 | |
| 104 | /* if no argument */ |
| 105 | if (p_arg[0] == 0) |
| 106 | { |
| 107 | arg_type = BTA_AG_AT_NONE; |
| 108 | } |
| 109 | /* else if arg is '?' and it is last character */ |
| 110 | else if (p_arg[0] == '?' && p_arg[1] == 0) |
| 111 | { |
| 112 | /* we have a read */ |
| 113 | arg_type = BTA_AG_AT_READ; |
| 114 | } |
| 115 | /* else if arg is '=' */ |
| 116 | else if (p_arg[0] == '=' && p_arg[1] != 0) |
| 117 | { |
| 118 | if (p_arg[1] == '?' && p_arg[2] == 0) |
| 119 | { |
| 120 | /* we have a test */ |
| 121 | arg_type = BTA_AG_AT_TEST; |
| 122 | } |
| 123 | else |
| 124 | { |
| 125 | /* we have a set */ |
| 126 | arg_type = BTA_AG_AT_SET; |
| 127 | |
| 128 | /* skip past '=' */ |
| 129 | p_arg++; |
| 130 | } |
| 131 | } |
| 132 | else |
| 133 | /* else it is freeform argument */ |
| 134 | { |
| 135 | arg_type = BTA_AG_AT_FREE; |
| 136 | } |
| 137 | |
| 138 | /* if arguments match command capabilities */ |
| 139 | if ((arg_type & p_cb->p_at_tbl[idx].arg_type) != 0) |
| 140 | { |
| 141 | /* if it's a set integer check max, min range */ |
| 142 | if (arg_type == BTA_AG_AT_SET && |
| 143 | p_cb->p_at_tbl[idx].fmt == BTA_AG_AT_INT) |
| 144 | { |
| 145 | int_arg = utl_str2int(p_arg); |
| 146 | if (int_arg < (INT16) p_cb->p_at_tbl[idx].min || |
| 147 | int_arg > (INT16) p_cb->p_at_tbl[idx].max) |
| 148 | { |
| 149 | /* arg out of range; error */ |
| 150 | (*p_cb->p_err_cback)(p_cb->p_user, FALSE, NULL); |
| 151 | } |
| 152 | else |
| 153 | { |
| 154 | |
| 155 | (*p_cb->p_cmd_cback)(p_cb->p_user, idx, arg_type, p_arg, int_arg); |
| 156 | } |
| 157 | } |
| 158 | else |
| 159 | { |
| 160 | (*p_cb->p_cmd_cback)(p_cb->p_user, idx, arg_type, p_arg, int_arg); |
| 161 | } |
| 162 | } |
| 163 | /* else error */ |
| 164 | else |
| 165 | { |
| 166 | (*p_cb->p_err_cback)(p_cb->p_user, FALSE, NULL); |
| 167 | } |
| 168 | } |
| 169 | /* else no match call error callback */ |
| 170 | else |
| 171 | { |
| 172 | (*p_cb->p_err_cback)(p_cb->p_user, TRUE, p_cb->p_cmd_buf); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | /****************************************************************************** |
| 177 | ** |
| 178 | ** Function bta_ag_at_parse |
| 179 | ** |
| 180 | ** Description Parse AT commands. This function will take the input |
| 181 | ** character string and parse it for AT commands according to |
| 182 | ** the AT command table passed in the control block. |
| 183 | ** |
| 184 | ** |
| 185 | ** Returns void |
| 186 | ** |
| 187 | ******************************************************************************/ |
| 188 | void bta_ag_at_parse(tBTA_AG_AT_CB *p_cb, char *p_buf, UINT16 len) |
| 189 | { |
| 190 | int i = 0; |
| 191 | char* p_save; |
| 192 | |
| 193 | if (p_cb->p_cmd_buf == NULL) |
| 194 | { |
| 195 | p_cb->p_cmd_buf = (char *) GKI_getbuf(p_cb->cmd_max_len); |
| 196 | p_cb->cmd_pos = 0; |
| 197 | } |
| 198 | |
| 199 | for (i = 0; i < len;) |
| 200 | { |
| 201 | while (p_cb->cmd_pos < p_cb->cmd_max_len-1 && i < len) |
| 202 | { |
| 203 | /* Skip null characters between AT commands. */ |
| 204 | if ((p_cb->cmd_pos == 0) && (p_buf[i] == 0)) |
| 205 | { |
| 206 | i++; |
| 207 | continue; |
| 208 | } |
| 209 | |
| 210 | p_cb->p_cmd_buf[p_cb->cmd_pos] = p_buf[i++]; |
| 211 | if ( p_cb->p_cmd_buf[p_cb->cmd_pos] == '\r' || p_cb->p_cmd_buf[p_cb->cmd_pos] == '\n') |
| 212 | { |
| 213 | p_cb->p_cmd_buf[p_cb->cmd_pos] = 0; |
| 214 | if ((p_cb->cmd_pos > 2) && |
| 215 | (p_cb->p_cmd_buf[0] == 'A' || p_cb->p_cmd_buf[0] == 'a') && |
| 216 | (p_cb->p_cmd_buf[1] == 'T' || p_cb->p_cmd_buf[1] == 't')) |
| 217 | { |
| 218 | p_save = p_cb->p_cmd_buf; |
| 219 | p_cb->p_cmd_buf += 2; |
| 220 | bta_ag_process_at(p_cb); |
| 221 | p_cb->p_cmd_buf = p_save; |
| 222 | } |
| 223 | |
| 224 | p_cb->cmd_pos = 0; |
| 225 | |
| 226 | } |
| 227 | else if( p_cb->p_cmd_buf[p_cb->cmd_pos] == 0x1A || p_cb->p_cmd_buf[p_cb->cmd_pos] == 0x1B ) |
| 228 | { |
| 229 | p_cb->p_cmd_buf[++p_cb->cmd_pos] = 0; |
| 230 | (*p_cb->p_err_cback)(p_cb->p_user, TRUE, p_cb->p_cmd_buf); |
| 231 | p_cb->cmd_pos = 0; |
| 232 | } |
| 233 | else |
| 234 | { |
| 235 | ++p_cb->cmd_pos; |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | if (i < len) |
| 240 | p_cb->cmd_pos = 0; |
| 241 | } |
| 242 | } |
| 243 | |