1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 // ***************************************************************************** 39 // 40 // GSM Model 41 // 42 // ***************************************************************************** 43 44 #include "btstack_config.h" 45 46 #include <stdint.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 #include "btstack_memory.h" 52 #include "classic/hfp.h" 53 #include "classic/hfp_gsm_model.h" 54 #include "classic/sdp.h" 55 #include "classic/sdp_query_rfcomm.h" 56 #include "btstack_debug.h" 57 #include "hci.h" 58 #include "hci_cmd.h" 59 #include "hci_dump.h" 60 #include "l2cap.h" 61 #include "btstack_run_loop.h" 62 63 #define HFP_GSM_MAX_NR_CALLS 3 64 #define HFP_GSM_MAX_CALL_NUMBER_SIZE 25 65 66 static hfp_gsm_call_t gsm_calls[HFP_GSM_MAX_NR_CALLS]; 67 static hfp_callsetup_status_t callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 68 69 static uint8_t clip_type; 70 static char clip_number[HFP_GSM_MAX_CALL_NUMBER_SIZE]; 71 static char last_dialed_number[HFP_GSM_MAX_CALL_NUMBER_SIZE]; 72 73 static void hfp_gsm_handler(hfp_ag_call_event_t event, uint8_t index, uint8_t type, const char * number); 74 75 void hfp_gsm_init(void){ 76 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 77 clip_type = 0; 78 memset(clip_number, 0, sizeof(clip_number)); 79 memset(last_dialed_number, 0, sizeof(last_dialed_number)); 80 memset(gsm_calls, 0, sizeof(gsm_calls)); 81 int i; 82 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 83 gsm_calls[i].status = CALL_NONE; 84 } 85 } 86 87 static int get_number_calls_with_status(hfp_gsm_call_status_t status){ 88 int i, count = 0; 89 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 90 if (gsm_calls[i].status == status) count++; 91 } 92 return count; 93 } 94 95 static int get_call_index_with_status(hfp_gsm_call_status_t status){ 96 int i ; 97 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 98 if (gsm_calls[i].status == status) return i; 99 } 100 return -1; 101 } 102 103 static inline int get_next_free_slot(void){ 104 return get_call_index_with_status(CALL_NONE); 105 } 106 107 static inline int get_active_call_index(void){ 108 return get_call_index_with_status(CALL_ACTIVE); 109 } 110 111 static inline int get_initiated_call_index(void){ 112 return get_call_index_with_status(CALL_INITIATED); 113 } 114 115 static inline int get_held_call_index(void){ 116 return get_call_index_with_status(CALL_HELD); 117 } 118 119 static inline int get_response_held_call_index(void){ 120 return get_call_index_with_status(CALL_RESPONSE_HOLD); 121 } 122 123 static inline int get_number_none_calls(void){ 124 return get_number_calls_with_status(CALL_NONE); 125 } 126 127 static inline int get_number_active_calls(void){ 128 return get_number_calls_with_status(CALL_ACTIVE); 129 } 130 131 static inline int get_number_held_calls(void){ 132 return get_number_calls_with_status(CALL_HELD); 133 } 134 135 static inline int get_number_response_held_calls(void){ 136 return get_number_calls_with_status(CALL_RESPONSE_HOLD); 137 } 138 139 static int next_call_index(void){ 140 return HFP_GSM_MAX_NR_CALLS + 1 - get_number_none_calls(); 141 } 142 143 static void hfp_gsm_set_clip(int index_in_table, uint8_t type, const char * number){ 144 if (strlen(number) == 0) return; 145 146 gsm_calls[index_in_table].clip_type = type; 147 148 int clip_number_size = strlen(number) < HFP_GSM_MAX_CALL_NUMBER_SIZE ? strlen(number) : HFP_GSM_MAX_CALL_NUMBER_SIZE-1; 149 strncpy(gsm_calls[index_in_table].clip_number, number, clip_number_size); 150 gsm_calls[index_in_table].clip_number[clip_number_size] = '\0'; 151 strncpy(last_dialed_number, number, clip_number_size); 152 last_dialed_number[clip_number_size] = '\0'; 153 154 clip_type = 0; 155 memset(clip_number, 0, sizeof(clip_number)); 156 } 157 158 static void delete_call(int delete_index_in_table){ 159 int i ; 160 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 161 if (gsm_calls[i].index > gsm_calls[delete_index_in_table].index){ 162 gsm_calls[i].index--; 163 } 164 } 165 166 gsm_calls[delete_index_in_table].status = CALL_NONE; 167 gsm_calls[delete_index_in_table].clip_type = 0; 168 gsm_calls[delete_index_in_table].index = 0; 169 gsm_calls[delete_index_in_table].clip_number[0] = '\0'; 170 gsm_calls[delete_index_in_table].mpty = HFP_ENHANCED_CALL_MPTY_NOT_A_CONFERENCE_CALL; 171 } 172 173 174 static void create_call(hfp_enhanced_call_dir_t direction){ 175 int next_free_slot = get_next_free_slot(); 176 gsm_calls[next_free_slot].direction = direction; 177 gsm_calls[next_free_slot].index = next_call_index(); 178 gsm_calls[next_free_slot].status = CALL_INITIATED; 179 gsm_calls[next_free_slot].clip_type = 0; 180 gsm_calls[next_free_slot].clip_number[0] = '\0'; 181 gsm_calls[next_free_slot].mpty = HFP_ENHANCED_CALL_MPTY_NOT_A_CONFERENCE_CALL; 182 183 hfp_gsm_set_clip(next_free_slot, clip_type, clip_number); 184 } 185 186 187 int hfp_gsm_get_number_of_calls(void){ 188 return HFP_GSM_MAX_NR_CALLS - get_number_none_calls(); 189 } 190 191 void hfp_gsm_clear_last_dialed_number(void){ 192 memset(last_dialed_number, 0, sizeof(last_dialed_number)); 193 } 194 195 char * hfp_gsm_last_dialed_number(void){ 196 return &last_dialed_number[0]; 197 } 198 199 hfp_gsm_call_t * hfp_gsm_call(int call_index){ 200 int i; 201 202 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 203 hfp_gsm_call_t * call = &gsm_calls[i]; 204 205 if (call->index != call_index) continue; 206 207 call->enhanced_status = HFP_ENHANCED_CALL_STATUS_CALL_HELD_BY_RESPONSE_AND_HOLD; 208 209 if (call->status == CALL_ACTIVE) call->enhanced_status = HFP_ENHANCED_CALL_STATUS_ACTIVE; 210 if (call->status == CALL_HELD) call->enhanced_status = HFP_ENHANCED_CALL_STATUS_HELD; 211 212 if (call->status == CALL_INITIATED){ 213 if (call->direction == HFP_ENHANCED_CALL_DIR_OUTGOING){ 214 if (callsetup_status == HFP_CALLSETUP_STATUS_OUTGOING_CALL_SETUP_IN_ALERTING_STATE){ 215 call->enhanced_status = HFP_ENHANCED_CALL_STATUS_OUTGOING_ALERTING; 216 } 217 call->enhanced_status = HFP_ENHANCED_CALL_STATUS_OUTGOING_DIALING; 218 } else { 219 if (get_number_active_calls() > 0){ 220 call->enhanced_status = HFP_ENHANCED_CALL_STATUS_INCOMING_WAITING; 221 } 222 call->enhanced_status = HFP_ENHANCED_CALL_STATUS_INCOMING; 223 } 224 } 225 return call; 226 } 227 return NULL; 228 } 229 230 uint8_t hfp_gsm_clip_type(void){ 231 if (clip_type != 0) return clip_type; 232 233 int initiated_call_index = get_initiated_call_index(); 234 if (initiated_call_index != -1){ 235 if (gsm_calls[initiated_call_index].clip_type != 0) { 236 return gsm_calls[initiated_call_index].clip_type; 237 } 238 } 239 240 int active_call_index = get_active_call_index(); 241 if (active_call_index != -1){ 242 if (gsm_calls[active_call_index].clip_type != 0) { 243 return gsm_calls[active_call_index].clip_type; 244 } 245 } 246 return 0; 247 } 248 249 char * hfp_gsm_clip_number(void){ 250 if (strlen(clip_number) != 0) return clip_number; 251 252 int initiated_call_index = get_initiated_call_index(); 253 if (initiated_call_index != -1){ 254 if (gsm_calls[initiated_call_index].clip_type != 0) { 255 return gsm_calls[initiated_call_index].clip_number; 256 } 257 } 258 259 int active_call_index = get_active_call_index(); 260 if (active_call_index != -1){ 261 if (gsm_calls[active_call_index].clip_type != 0) { 262 return gsm_calls[active_call_index].clip_number; 263 } 264 } 265 clip_number[0] = 0; 266 return clip_number; 267 } 268 269 hfp_call_status_t hfp_gsm_call_status(void){ 270 if (get_number_active_calls() + get_number_held_calls() + get_number_response_held_calls()){ 271 return HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT; 272 } 273 return HFP_CALL_STATUS_NO_HELD_OR_ACTIVE_CALLS; 274 } 275 276 hfp_callheld_status_t hfp_gsm_callheld_status(void){ 277 // @note: order is important 278 if (get_number_held_calls() == 0){ 279 return HFP_CALLHELD_STATUS_NO_CALLS_HELD; 280 } 281 if (get_number_active_calls() == 0) { 282 return HFP_CALLHELD_STATUS_CALL_ON_HOLD_AND_NO_ACTIVE_CALLS; 283 } 284 return HFP_CALLHELD_STATUS_CALL_ON_HOLD_OR_SWAPPED; 285 } 286 287 hfp_callsetup_status_t hfp_gsm_callsetup_status(void){ 288 return callsetup_status; 289 } 290 291 static int hfp_gsm_response_held_active(void){ 292 return get_response_held_call_index() != -1 ; 293 } 294 295 int hfp_gsm_call_possible(void){ 296 return get_number_none_calls() > 0; 297 } 298 299 void hfp_gsm_handle_event(hfp_ag_call_event_t event){ 300 hfp_gsm_handler(event, 0, 0, NULL); 301 } 302 303 void hfp_gsm_handle_event_with_clip(hfp_ag_call_event_t event, uint8_t type, const char * number){ 304 hfp_gsm_handler(event, 0, type, number); 305 } 306 307 void hfp_gsm_handle_event_with_call_index(hfp_ag_call_event_t event, uint8_t index){ 308 hfp_gsm_handler(event, index, 0, NULL); 309 } 310 311 void hfp_gsm_handle_event_with_call_number(hfp_ag_call_event_t event, const char * number){ 312 hfp_gsm_handler(event, 0, 0, number); 313 } 314 315 static void hfp_gsm_handler(hfp_ag_call_event_t event, uint8_t index, uint8_t type, const char * number){ 316 int next_free_slot = get_next_free_slot(); 317 int current_call_index = get_active_call_index(); 318 int initiated_call_index = get_initiated_call_index(); 319 int held_call_index = get_held_call_index(); 320 int i; 321 322 switch (event){ 323 case HFP_AG_OUTGOING_CALL_INITIATED: 324 case HFP_AG_OUTGOING_REDIAL_INITIATED: 325 if (next_free_slot == -1){ 326 log_error("gsm: max call nr exceeded"); 327 return; 328 } 329 create_call(HFP_ENHANCED_CALL_DIR_OUTGOING); 330 break; 331 332 case HFP_AG_OUTGOING_CALL_REJECTED: 333 if (current_call_index != -1){ 334 delete_call(current_call_index); 335 } 336 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 337 break; 338 339 case HFP_AG_OUTGOING_CALL_ACCEPTED: 340 if (current_call_index != -1){ 341 gsm_calls[current_call_index].status = CALL_HELD; 342 } 343 callsetup_status = HFP_CALLSETUP_STATUS_OUTGOING_CALL_SETUP_IN_DIALING_STATE; 344 break; 345 346 case HFP_AG_OUTGOING_CALL_RINGING: 347 if (current_call_index == -1){ 348 log_error("gsm: no active call"); 349 return; 350 } 351 callsetup_status = HFP_CALLSETUP_STATUS_OUTGOING_CALL_SETUP_IN_ALERTING_STATE; 352 break; 353 case HFP_AG_OUTGOING_CALL_ESTABLISHED: 354 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 355 gsm_calls[initiated_call_index].status = CALL_ACTIVE; 356 break; 357 358 case HFP_AG_INCOMING_CALL: 359 if (hfp_gsm_callsetup_status() != HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS) break; 360 callsetup_status = HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS; 361 create_call(HFP_ENHANCED_CALL_DIR_INCOMING); 362 break; 363 364 case HFP_AG_INCOMING_CALL_ACCEPTED_BY_AG: 365 if (hfp_gsm_callsetup_status() != HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS) break; 366 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 367 368 if (hfp_gsm_call_status() == HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT){ 369 gsm_calls[current_call_index].status = CALL_HELD; 370 } 371 gsm_calls[initiated_call_index].status = CALL_ACTIVE; 372 break; 373 374 case HFP_AG_HELD_CALL_JOINED_BY_AG: 375 if (hfp_gsm_call_status() != HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT) break; 376 377 // TODO: is following condition correct? Can we join incoming call before it is answered? 378 if (callsetup_status == HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS){ 379 gsm_calls[initiated_call_index].status = CALL_ACTIVE; 380 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 381 } else if (hfp_gsm_callheld_status() == HFP_CALLHELD_STATUS_CALL_ON_HOLD_OR_SWAPPED) { 382 gsm_calls[held_call_index].status = CALL_ACTIVE; 383 } 384 385 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 386 if (gsm_calls[i].status == CALL_ACTIVE){ 387 gsm_calls[i].mpty = HFP_ENHANCED_CALL_MPTY_CONFERENCE_CALL; 388 } 389 } 390 break; 391 392 case HFP_AG_INCOMING_CALL_ACCEPTED_BY_HF: 393 if (hfp_gsm_callsetup_status() != HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS) break; 394 if (hfp_gsm_call_status() != HFP_CALL_STATUS_NO_HELD_OR_ACTIVE_CALLS) break; 395 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 396 gsm_calls[initiated_call_index].status = CALL_ACTIVE; 397 break; 398 399 case HFP_AG_RESPONSE_AND_HOLD_ACCEPT_INCOMING_CALL_BY_AG: 400 case HFP_AG_RESPONSE_AND_HOLD_ACCEPT_INCOMING_CALL_BY_HF: 401 if (hfp_gsm_callsetup_status() != HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS) break; 402 if (hfp_gsm_call_status() != HFP_CALL_STATUS_NO_HELD_OR_ACTIVE_CALLS) break; 403 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 404 gsm_calls[initiated_call_index].status = CALL_RESPONSE_HOLD; 405 break; 406 407 case HFP_AG_RESPONSE_AND_HOLD_ACCEPT_HELD_CALL_BY_AG: 408 case HFP_AG_RESPONSE_AND_HOLD_ACCEPT_HELD_CALL_BY_HF: 409 if (!hfp_gsm_response_held_active()) break; 410 gsm_calls[get_response_held_call_index()].status = CALL_ACTIVE; 411 break; 412 413 case HFP_AG_RESPONSE_AND_HOLD_REJECT_HELD_CALL_BY_AG: 414 case HFP_AG_RESPONSE_AND_HOLD_REJECT_HELD_CALL_BY_HF: 415 if (!hfp_gsm_response_held_active()) break; 416 delete_call(get_response_held_call_index()); 417 break; 418 419 420 case HFP_AG_TERMINATE_CALL_BY_HF: 421 switch (hfp_gsm_call_status()){ 422 case HFP_CALL_STATUS_NO_HELD_OR_ACTIVE_CALLS: 423 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 424 break; 425 case HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT: 426 delete_call(current_call_index); 427 break; 428 } 429 break; 430 431 case HFP_AG_TERMINATE_CALL_BY_AG: 432 switch (hfp_gsm_call_status()){ 433 case HFP_CALL_STATUS_NO_HELD_OR_ACTIVE_CALLS: 434 if (hfp_gsm_callsetup_status() != HFP_CALLSETUP_STATUS_INCOMING_CALL_SETUP_IN_PROGRESS) break; 435 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 436 break; 437 case HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT: 438 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 439 delete_call(current_call_index); 440 break; 441 default: 442 break; 443 } 444 break; 445 446 case HFP_AG_CALL_DROPPED: 447 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 448 if (hfp_gsm_call_status() != HFP_CALL_STATUS_ACTIVE_OR_HELD_CALL_IS_PRESENT) break; 449 450 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 451 delete_call(i); 452 } 453 break; 454 455 case HFP_AG_CALL_HOLD_USER_BUSY: 456 // Held or waiting call gets active, 457 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 458 gsm_calls[initiated_call_index].status = CALL_NONE; 459 gsm_calls[held_call_index].status = CALL_ACTIVE; 460 break; 461 462 case HFP_AG_CALL_HOLD_RELEASE_ACTIVE_ACCEPT_HELD_OR_WAITING_CALL: 463 if (index != 0 && index <= HFP_GSM_MAX_NR_CALLS ){ 464 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 465 if (gsm_calls[i].index == index){ 466 delete_call(i); 467 continue; 468 } 469 } 470 } else { 471 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 472 if (gsm_calls[i].status == CALL_ACTIVE){ 473 delete_call(i); 474 } 475 } 476 } 477 478 if (callsetup_status != HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS){ 479 gsm_calls[initiated_call_index].status = CALL_ACTIVE; 480 } else { 481 gsm_calls[held_call_index].status = CALL_ACTIVE; 482 } 483 484 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 485 break; 486 487 case HFP_AG_CALL_HOLD_PARK_ACTIVE_ACCEPT_HELD_OR_WAITING_CALL: 488 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 489 if (gsm_calls[i].status == CALL_ACTIVE && gsm_calls[i].index != index){ 490 gsm_calls[i].status = CALL_HELD; 491 } 492 } 493 494 if (callsetup_status != HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS){ 495 gsm_calls[initiated_call_index].status = CALL_ACTIVE; 496 } else { 497 gsm_calls[held_call_index].status = CALL_ACTIVE; 498 } 499 callsetup_status = HFP_CALLSETUP_STATUS_NO_CALL_SETUP_IN_PROGRESS; 500 break; 501 502 case HFP_AG_CALL_HOLD_ADD_HELD_CALL: 503 if (hfp_gsm_callheld_status() != HFP_CALLHELD_STATUS_NO_CALLS_HELD){ 504 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 505 if (gsm_calls[i].status != CALL_NONE){ 506 gsm_calls[i].status = CALL_ACTIVE; 507 gsm_calls[i].mpty = HFP_ENHANCED_CALL_MPTY_CONFERENCE_CALL; 508 } 509 } 510 } 511 break; 512 513 case HFP_AG_CALL_HOLD_EXIT_AND_JOIN_CALLS: 514 for (i = 0; i < HFP_GSM_MAX_NR_CALLS; i++){ 515 delete_call(i); 516 } 517 break; 518 519 case HFP_AG_SET_CLIP: 520 if (initiated_call_index != -1){ 521 hfp_gsm_set_clip(initiated_call_index, type, number); 522 break; 523 } 524 525 clip_type = type; 526 strncpy(clip_number, number, sizeof(clip_number)); 527 clip_number[sizeof(clip_number)-1] = '\0'; 528 529 break; 530 default: 531 break; 532 } 533 }