1 /* 2 ** 2006 June 7 3 ** 4 ** The author disclaims copyright to this source code. In place of 5 ** a legal notice, here is a blessing: 6 ** 7 ** May you do good and not evil. 8 ** May you find forgiveness for yourself and forgive others. 9 ** May you share freely, never taking more than you give. 10 ** 11 ************************************************************************* 12 ** This file contains code used to dynamically load extensions into 13 ** the SQLite library. 14 */ 15 16 #ifndef SQLITE_CORE 17 #define SQLITE_CORE 1 /* Disable the API redefinition in sqlite3ext.h */ 18 #endif 19 #include "sqlite3ext.h" 20 #include "sqliteInt.h" 21 #include <string.h> 22 23 #ifndef SQLITE_OMIT_LOAD_EXTENSION 24 25 /* 26 ** Some API routines are omitted when various features are 27 ** excluded from a build of SQLite. Substitute a NULL pointer 28 ** for any missing APIs. 29 */ 30 #ifndef SQLITE_ENABLE_COLUMN_METADATA 31 # define sqlite3_column_database_name 0 32 # define sqlite3_column_database_name16 0 33 # define sqlite3_column_table_name 0 34 # define sqlite3_column_table_name16 0 35 # define sqlite3_column_origin_name 0 36 # define sqlite3_column_origin_name16 0 37 #endif 38 39 #ifdef SQLITE_OMIT_AUTHORIZATION 40 # define sqlite3_set_authorizer 0 41 #endif 42 43 #ifdef SQLITE_OMIT_UTF16 44 # define sqlite3_bind_text16 0 45 # define sqlite3_collation_needed16 0 46 # define sqlite3_column_decltype16 0 47 # define sqlite3_column_name16 0 48 # define sqlite3_column_text16 0 49 # define sqlite3_complete16 0 50 # define sqlite3_create_collation16 0 51 # define sqlite3_create_function16 0 52 # define sqlite3_errmsg16 0 53 # define sqlite3_open16 0 54 # define sqlite3_prepare16 0 55 # define sqlite3_prepare16_v2 0 56 # define sqlite3_result_error16 0 57 # define sqlite3_result_text16 0 58 # define sqlite3_result_text16be 0 59 # define sqlite3_result_text16le 0 60 # define sqlite3_value_text16 0 61 # define sqlite3_value_text16be 0 62 # define sqlite3_value_text16le 0 63 # define sqlite3_column_database_name16 0 64 # define sqlite3_column_table_name16 0 65 # define sqlite3_column_origin_name16 0 66 #endif 67 68 #ifdef SQLITE_OMIT_COMPLETE 69 # define sqlite3_complete 0 70 # define sqlite3_complete16 0 71 #endif 72 73 #ifdef SQLITE_OMIT_DECLTYPE 74 # define sqlite3_column_decltype16 0 75 # define sqlite3_column_decltype 0 76 #endif 77 78 #ifdef SQLITE_OMIT_PROGRESS_CALLBACK 79 # define sqlite3_progress_handler 0 80 #endif 81 82 #ifdef SQLITE_OMIT_VIRTUALTABLE 83 # define sqlite3_create_module 0 84 # define sqlite3_create_module_v2 0 85 # define sqlite3_declare_vtab 0 86 # define sqlite3_vtab_config 0 87 # define sqlite3_vtab_on_conflict 0 88 #endif 89 90 #ifdef SQLITE_OMIT_SHARED_CACHE 91 # define sqlite3_enable_shared_cache 0 92 #endif 93 94 #ifdef SQLITE_OMIT_TRACE 95 # define sqlite3_profile 0 96 # define sqlite3_trace 0 97 #endif 98 99 #ifdef SQLITE_OMIT_GET_TABLE 100 # define sqlite3_free_table 0 101 # define sqlite3_get_table 0 102 #endif 103 104 #ifdef SQLITE_OMIT_INCRBLOB 105 #define sqlite3_bind_zeroblob 0 106 #define sqlite3_blob_bytes 0 107 #define sqlite3_blob_close 0 108 #define sqlite3_blob_open 0 109 #define sqlite3_blob_read 0 110 #define sqlite3_blob_write 0 111 #define sqlite3_blob_reopen 0 112 #endif 113 114 /* 115 ** The following structure contains pointers to all SQLite API routines. 116 ** A pointer to this structure is passed into extensions when they are 117 ** loaded so that the extension can make calls back into the SQLite 118 ** library. 119 ** 120 ** When adding new APIs, add them to the bottom of this structure 121 ** in order to preserve backwards compatibility. 122 ** 123 ** Extensions that use newer APIs should first call the 124 ** sqlite3_libversion_number() to make sure that the API they 125 ** intend to use is supported by the library. Extensions should 126 ** also check to make sure that the pointer to the function is 127 ** not NULL before calling it. 128 */ 129 static const sqlite3_api_routines sqlite3Apis = { 130 sqlite3_aggregate_context, 131 #ifndef SQLITE_OMIT_DEPRECATED 132 sqlite3_aggregate_count, 133 #else 134 0, 135 #endif 136 sqlite3_bind_blob, 137 sqlite3_bind_double, 138 sqlite3_bind_int, 139 sqlite3_bind_int64, 140 sqlite3_bind_null, 141 sqlite3_bind_parameter_count, 142 sqlite3_bind_parameter_index, 143 sqlite3_bind_parameter_name, 144 sqlite3_bind_text, 145 sqlite3_bind_text16, 146 sqlite3_bind_value, 147 sqlite3_busy_handler, 148 sqlite3_busy_timeout, 149 sqlite3_changes, 150 sqlite3_close, 151 sqlite3_collation_needed, 152 sqlite3_collation_needed16, 153 sqlite3_column_blob, 154 sqlite3_column_bytes, 155 sqlite3_column_bytes16, 156 sqlite3_column_count, 157 sqlite3_column_database_name, 158 sqlite3_column_database_name16, 159 sqlite3_column_decltype, 160 sqlite3_column_decltype16, 161 sqlite3_column_double, 162 sqlite3_column_int, 163 sqlite3_column_int64, 164 sqlite3_column_name, 165 sqlite3_column_name16, 166 sqlite3_column_origin_name, 167 sqlite3_column_origin_name16, 168 sqlite3_column_table_name, 169 sqlite3_column_table_name16, 170 sqlite3_column_text, 171 sqlite3_column_text16, 172 sqlite3_column_type, 173 sqlite3_column_value, 174 sqlite3_commit_hook, 175 sqlite3_complete, 176 sqlite3_complete16, 177 sqlite3_create_collation, 178 sqlite3_create_collation16, 179 sqlite3_create_function, 180 sqlite3_create_function16, 181 sqlite3_create_module, 182 sqlite3_data_count, 183 sqlite3_db_handle, 184 sqlite3_declare_vtab, 185 sqlite3_enable_shared_cache, 186 sqlite3_errcode, 187 sqlite3_errmsg, 188 sqlite3_errmsg16, 189 sqlite3_exec, 190 #ifndef SQLITE_OMIT_DEPRECATED 191 sqlite3_expired, 192 #else 193 0, 194 #endif 195 sqlite3_finalize, 196 sqlite3_free, 197 sqlite3_free_table, 198 sqlite3_get_autocommit, 199 sqlite3_get_auxdata, 200 sqlite3_get_table, 201 0, /* Was sqlite3_global_recover(), but that function is deprecated */ 202 sqlite3_interrupt, 203 sqlite3_last_insert_rowid, 204 sqlite3_libversion, 205 sqlite3_libversion_number, 206 sqlite3_malloc, 207 sqlite3_mprintf, 208 sqlite3_open, 209 sqlite3_open16, 210 sqlite3_prepare, 211 sqlite3_prepare16, 212 sqlite3_profile, 213 sqlite3_progress_handler, 214 sqlite3_realloc, 215 sqlite3_reset, 216 sqlite3_result_blob, 217 sqlite3_result_double, 218 sqlite3_result_error, 219 sqlite3_result_error16, 220 sqlite3_result_int, 221 sqlite3_result_int64, 222 sqlite3_result_null, 223 sqlite3_result_text, 224 sqlite3_result_text16, 225 sqlite3_result_text16be, 226 sqlite3_result_text16le, 227 sqlite3_result_value, 228 sqlite3_rollback_hook, 229 sqlite3_set_authorizer, 230 sqlite3_set_auxdata, 231 sqlite3_snprintf, 232 sqlite3_step, 233 sqlite3_table_column_metadata, 234 #ifndef SQLITE_OMIT_DEPRECATED 235 sqlite3_thread_cleanup, 236 #else 237 0, 238 #endif 239 sqlite3_total_changes, 240 sqlite3_trace, 241 #ifndef SQLITE_OMIT_DEPRECATED 242 sqlite3_transfer_bindings, 243 #else 244 0, 245 #endif 246 sqlite3_update_hook, 247 sqlite3_user_data, 248 sqlite3_value_blob, 249 sqlite3_value_bytes, 250 sqlite3_value_bytes16, 251 sqlite3_value_double, 252 sqlite3_value_int, 253 sqlite3_value_int64, 254 sqlite3_value_numeric_type, 255 sqlite3_value_text, 256 sqlite3_value_text16, 257 sqlite3_value_text16be, 258 sqlite3_value_text16le, 259 sqlite3_value_type, 260 sqlite3_vmprintf, 261 /* 262 ** The original API set ends here. All extensions can call any 263 ** of the APIs above provided that the pointer is not NULL. But 264 ** before calling APIs that follow, extension should check the 265 ** sqlite3_libversion_number() to make sure they are dealing with 266 ** a library that is new enough to support that API. 267 ************************************************************************* 268 */ 269 sqlite3_overload_function, 270 271 /* 272 ** Added after 3.3.13 273 */ 274 sqlite3_prepare_v2, 275 sqlite3_prepare16_v2, 276 sqlite3_clear_bindings, 277 278 /* 279 ** Added for 3.4.1 280 */ 281 sqlite3_create_module_v2, 282 283 /* 284 ** Added for 3.5.0 285 */ 286 sqlite3_bind_zeroblob, 287 sqlite3_blob_bytes, 288 sqlite3_blob_close, 289 sqlite3_blob_open, 290 sqlite3_blob_read, 291 sqlite3_blob_write, 292 sqlite3_create_collation_v2, 293 sqlite3_file_control, 294 sqlite3_memory_highwater, 295 sqlite3_memory_used, 296 #ifdef SQLITE_MUTEX_OMIT 297 0, 298 0, 299 0, 300 0, 301 0, 302 #else 303 sqlite3_mutex_alloc, 304 sqlite3_mutex_enter, 305 sqlite3_mutex_free, 306 sqlite3_mutex_leave, 307 sqlite3_mutex_try, 308 #endif 309 sqlite3_open_v2, 310 sqlite3_release_memory, 311 sqlite3_result_error_nomem, 312 sqlite3_result_error_toobig, 313 sqlite3_sleep, 314 sqlite3_soft_heap_limit, 315 sqlite3_vfs_find, 316 sqlite3_vfs_register, 317 sqlite3_vfs_unregister, 318 319 /* 320 ** Added for 3.5.8 321 */ 322 sqlite3_threadsafe, 323 sqlite3_result_zeroblob, 324 sqlite3_result_error_code, 325 sqlite3_test_control, 326 sqlite3_randomness, 327 sqlite3_context_db_handle, 328 329 /* 330 ** Added for 3.6.0 331 */ 332 sqlite3_extended_result_codes, 333 sqlite3_limit, 334 sqlite3_next_stmt, 335 sqlite3_sql, 336 sqlite3_status, 337 338 /* 339 ** Added for 3.7.4 340 */ 341 sqlite3_backup_finish, 342 sqlite3_backup_init, 343 sqlite3_backup_pagecount, 344 sqlite3_backup_remaining, 345 sqlite3_backup_step, 346 #ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS 347 sqlite3_compileoption_get, 348 sqlite3_compileoption_used, 349 #else 350 0, 351 0, 352 #endif 353 sqlite3_create_function_v2, 354 sqlite3_db_config, 355 sqlite3_db_mutex, 356 sqlite3_db_status, 357 sqlite3_extended_errcode, 358 sqlite3_log, 359 sqlite3_soft_heap_limit64, 360 sqlite3_sourceid, 361 sqlite3_stmt_status, 362 sqlite3_strnicmp, 363 #ifdef SQLITE_ENABLE_UNLOCK_NOTIFY 364 sqlite3_unlock_notify, 365 #else 366 0, 367 #endif 368 #ifndef SQLITE_OMIT_WAL 369 sqlite3_wal_autocheckpoint, 370 sqlite3_wal_checkpoint, 371 sqlite3_wal_hook, 372 #else 373 0, 374 0, 375 0, 376 #endif 377 sqlite3_blob_reopen, 378 sqlite3_vtab_config, 379 sqlite3_vtab_on_conflict, 380 sqlite3_close_v2, 381 sqlite3_db_filename, 382 sqlite3_db_readonly, 383 sqlite3_db_release_memory, 384 sqlite3_errstr, 385 sqlite3_stmt_busy, 386 sqlite3_stmt_readonly, 387 sqlite3_stricmp, 388 sqlite3_uri_boolean, 389 sqlite3_uri_int64, 390 sqlite3_uri_parameter, 391 sqlite3_vsnprintf, 392 sqlite3_wal_checkpoint_v2, 393 /* Version 3.8.7 and later */ 394 sqlite3_auto_extension, 395 sqlite3_bind_blob64, 396 sqlite3_bind_text64, 397 sqlite3_cancel_auto_extension, 398 sqlite3_load_extension, 399 sqlite3_malloc64, 400 sqlite3_msize, 401 sqlite3_realloc64, 402 sqlite3_reset_auto_extension, 403 sqlite3_result_blob64, 404 sqlite3_result_text64, 405 sqlite3_strglob, 406 /* Version 3.8.11 and later */ 407 (sqlite3_value*(*)(const sqlite3_value*))sqlite3_value_dup, 408 sqlite3_value_free 409 }; 410 411 /* 412 ** Attempt to load an SQLite extension library contained in the file 413 ** zFile. The entry point is zProc. zProc may be 0 in which case a 414 ** default entry point name (sqlite3_extension_init) is used. Use 415 ** of the default name is recommended. 416 ** 417 ** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong. 418 ** 419 ** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with 420 ** error message text. The calling function should free this memory 421 ** by calling sqlite3DbFree(db, ). 422 */ 423 static int sqlite3LoadExtension( 424 sqlite3 *db, /* Load the extension into this database connection */ 425 const char *zFile, /* Name of the shared library containing extension */ 426 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 427 char **pzErrMsg /* Put error message here if not 0 */ 428 ){ 429 sqlite3_vfs *pVfs = db->pVfs; 430 void *handle; 431 int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*); 432 char *zErrmsg = 0; 433 const char *zEntry; 434 char *zAltEntry = 0; 435 void **aHandle; 436 u64 nMsg = 300 + sqlite3Strlen30(zFile); 437 int ii; 438 439 /* Shared library endings to try if zFile cannot be loaded as written */ 440 static const char *azEndings[] = { 441 #if SQLITE_OS_WIN 442 "dll" 443 #elif defined(__APPLE__) 444 "dylib" 445 #else 446 "so" 447 #endif 448 }; 449 450 451 if( pzErrMsg ) *pzErrMsg = 0; 452 453 /* Ticket #1863. To avoid a creating security problems for older 454 ** applications that relink against newer versions of SQLite, the 455 ** ability to run load_extension is turned off by default. One 456 ** must call sqlite3_enable_load_extension() to turn on extension 457 ** loading. Otherwise you get the following error. 458 */ 459 if( (db->flags & SQLITE_LoadExtension)==0 ){ 460 if( pzErrMsg ){ 461 *pzErrMsg = sqlite3_mprintf("not authorized"); 462 } 463 return SQLITE_ERROR; 464 } 465 466 zEntry = zProc ? zProc : "sqlite3_extension_init"; 467 468 handle = sqlite3OsDlOpen(pVfs, zFile); 469 #if SQLITE_OS_UNIX || SQLITE_OS_WIN 470 for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){ 471 char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]); 472 if( zAltFile==0 ) return SQLITE_NOMEM; 473 handle = sqlite3OsDlOpen(pVfs, zAltFile); 474 sqlite3_free(zAltFile); 475 } 476 #endif 477 if( handle==0 ){ 478 if( pzErrMsg ){ 479 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 480 if( zErrmsg ){ 481 sqlite3_snprintf(nMsg, zErrmsg, 482 "unable to open shared library [%s]", zFile); 483 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 484 } 485 } 486 return SQLITE_ERROR; 487 } 488 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 489 sqlite3OsDlSym(pVfs, handle, zEntry); 490 491 /* If no entry point was specified and the default legacy 492 ** entry point name "sqlite3_extension_init" was not found, then 493 ** construct an entry point name "sqlite3_X_init" where the X is 494 ** replaced by the lowercase value of every ASCII alphabetic 495 ** character in the filename after the last "/" upto the first ".", 496 ** and eliding the first three characters if they are "lib". 497 ** Examples: 498 ** 499 ** /usr/local/lib/libExample5.4.3.so ==> sqlite3_example_init 500 ** C:/lib/mathfuncs.dll ==> sqlite3_mathfuncs_init 501 */ 502 if( xInit==0 && zProc==0 ){ 503 int iFile, iEntry, c; 504 int ncFile = sqlite3Strlen30(zFile); 505 zAltEntry = sqlite3_malloc64(ncFile+30); 506 if( zAltEntry==0 ){ 507 sqlite3OsDlClose(pVfs, handle); 508 return SQLITE_NOMEM; 509 } 510 memcpy(zAltEntry, "sqlite3_", 8); 511 for(iFile=ncFile-1; iFile>=0 && zFile[iFile]!='/'; iFile--){} 512 iFile++; 513 if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3; 514 for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){ 515 if( sqlite3Isalpha(c) ){ 516 zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c]; 517 } 518 } 519 memcpy(zAltEntry+iEntry, "_init", 6); 520 zEntry = zAltEntry; 521 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 522 sqlite3OsDlSym(pVfs, handle, zEntry); 523 } 524 if( xInit==0 ){ 525 if( pzErrMsg ){ 526 nMsg += sqlite3Strlen30(zEntry); 527 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 528 if( zErrmsg ){ 529 sqlite3_snprintf(nMsg, zErrmsg, 530 "no entry point [%s] in shared library [%s]", zEntry, zFile); 531 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 532 } 533 } 534 sqlite3OsDlClose(pVfs, handle); 535 sqlite3_free(zAltEntry); 536 return SQLITE_ERROR; 537 } 538 sqlite3_free(zAltEntry); 539 if( xInit(db, &zErrmsg, &sqlite3Apis) ){ 540 if( pzErrMsg ){ 541 *pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg); 542 } 543 sqlite3_free(zErrmsg); 544 sqlite3OsDlClose(pVfs, handle); 545 return SQLITE_ERROR; 546 } 547 548 /* Append the new shared library handle to the db->aExtension array. */ 549 aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1)); 550 if( aHandle==0 ){ 551 return SQLITE_NOMEM; 552 } 553 if( db->nExtension>0 ){ 554 memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension); 555 } 556 sqlite3DbFree(db, db->aExtension); 557 db->aExtension = aHandle; 558 559 db->aExtension[db->nExtension++] = handle; 560 return SQLITE_OK; 561 } 562 int sqlite3_load_extension( 563 sqlite3 *db, /* Load the extension into this database connection */ 564 const char *zFile, /* Name of the shared library containing extension */ 565 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 566 char **pzErrMsg /* Put error message here if not 0 */ 567 ){ 568 int rc; 569 sqlite3_mutex_enter(db->mutex); 570 rc = sqlite3LoadExtension(db, zFile, zProc, pzErrMsg); 571 rc = sqlite3ApiExit(db, rc); 572 sqlite3_mutex_leave(db->mutex); 573 return rc; 574 } 575 576 /* 577 ** Call this routine when the database connection is closing in order 578 ** to clean up loaded extensions 579 */ 580 void sqlite3CloseExtensions(sqlite3 *db){ 581 int i; 582 assert( sqlite3_mutex_held(db->mutex) ); 583 for(i=0; i<db->nExtension; i++){ 584 sqlite3OsDlClose(db->pVfs, db->aExtension[i]); 585 } 586 sqlite3DbFree(db, db->aExtension); 587 } 588 589 /* 590 ** Enable or disable extension loading. Extension loading is disabled by 591 ** default so as not to open security holes in older applications. 592 */ 593 int sqlite3_enable_load_extension(sqlite3 *db, int onoff){ 594 sqlite3_mutex_enter(db->mutex); 595 if( onoff ){ 596 db->flags |= SQLITE_LoadExtension; 597 }else{ 598 db->flags &= ~SQLITE_LoadExtension; 599 } 600 sqlite3_mutex_leave(db->mutex); 601 return SQLITE_OK; 602 } 603 604 #endif /* SQLITE_OMIT_LOAD_EXTENSION */ 605 606 /* 607 ** The auto-extension code added regardless of whether or not extension 608 ** loading is supported. We need a dummy sqlite3Apis pointer for that 609 ** code if regular extension loading is not available. This is that 610 ** dummy pointer. 611 */ 612 #ifdef SQLITE_OMIT_LOAD_EXTENSION 613 static const sqlite3_api_routines sqlite3Apis = { 0 }; 614 #endif 615 616 617 /* 618 ** The following object holds the list of automatically loaded 619 ** extensions. 620 ** 621 ** This list is shared across threads. The SQLITE_MUTEX_STATIC_MASTER 622 ** mutex must be held while accessing this list. 623 */ 624 typedef struct sqlite3AutoExtList sqlite3AutoExtList; 625 static SQLITE_WSD struct sqlite3AutoExtList { 626 u32 nExt; /* Number of entries in aExt[] */ 627 void (**aExt)(void); /* Pointers to the extension init functions */ 628 } sqlite3Autoext = { 0, 0 }; 629 630 /* The "wsdAutoext" macro will resolve to the autoextension 631 ** state vector. If writable static data is unsupported on the target, 632 ** we have to locate the state vector at run-time. In the more common 633 ** case where writable static data is supported, wsdStat can refer directly 634 ** to the "sqlite3Autoext" state vector declared above. 635 */ 636 #ifdef SQLITE_OMIT_WSD 637 # define wsdAutoextInit \ 638 sqlite3AutoExtList *x = &GLOBAL(sqlite3AutoExtList,sqlite3Autoext) 639 # define wsdAutoext x[0] 640 #else 641 # define wsdAutoextInit 642 # define wsdAutoext sqlite3Autoext 643 #endif 644 645 646 /* 647 ** Register a statically linked extension that is automatically 648 ** loaded by every new database connection. 649 */ 650 int sqlite3_auto_extension(void (*xInit)(void)){ 651 int rc = SQLITE_OK; 652 #ifndef SQLITE_OMIT_AUTOINIT 653 rc = sqlite3_initialize(); 654 if( rc ){ 655 return rc; 656 }else 657 #endif 658 { 659 u32 i; 660 #if SQLITE_THREADSAFE 661 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 662 #endif 663 wsdAutoextInit; 664 sqlite3_mutex_enter(mutex); 665 for(i=0; i<wsdAutoext.nExt; i++){ 666 if( wsdAutoext.aExt[i]==xInit ) break; 667 } 668 if( i==wsdAutoext.nExt ){ 669 u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]); 670 void (**aNew)(void); 671 aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte); 672 if( aNew==0 ){ 673 rc = SQLITE_NOMEM; 674 }else{ 675 wsdAutoext.aExt = aNew; 676 wsdAutoext.aExt[wsdAutoext.nExt] = xInit; 677 wsdAutoext.nExt++; 678 } 679 } 680 sqlite3_mutex_leave(mutex); 681 assert( (rc&0xff)==rc ); 682 return rc; 683 } 684 } 685 686 /* 687 ** Cancel a prior call to sqlite3_auto_extension. Remove xInit from the 688 ** set of routines that is invoked for each new database connection, if it 689 ** is currently on the list. If xInit is not on the list, then this 690 ** routine is a no-op. 691 ** 692 ** Return 1 if xInit was found on the list and removed. Return 0 if xInit 693 ** was not on the list. 694 */ 695 int sqlite3_cancel_auto_extension(void (*xInit)(void)){ 696 #if SQLITE_THREADSAFE 697 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 698 #endif 699 int i; 700 int n = 0; 701 wsdAutoextInit; 702 sqlite3_mutex_enter(mutex); 703 for(i=(int)wsdAutoext.nExt-1; i>=0; i--){ 704 if( wsdAutoext.aExt[i]==xInit ){ 705 wsdAutoext.nExt--; 706 wsdAutoext.aExt[i] = wsdAutoext.aExt[wsdAutoext.nExt]; 707 n++; 708 break; 709 } 710 } 711 sqlite3_mutex_leave(mutex); 712 return n; 713 } 714 715 /* 716 ** Reset the automatic extension loading mechanism. 717 */ 718 void sqlite3_reset_auto_extension(void){ 719 #ifndef SQLITE_OMIT_AUTOINIT 720 if( sqlite3_initialize()==SQLITE_OK ) 721 #endif 722 { 723 #if SQLITE_THREADSAFE 724 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 725 #endif 726 wsdAutoextInit; 727 sqlite3_mutex_enter(mutex); 728 sqlite3_free(wsdAutoext.aExt); 729 wsdAutoext.aExt = 0; 730 wsdAutoext.nExt = 0; 731 sqlite3_mutex_leave(mutex); 732 } 733 } 734 735 /* 736 ** Load all automatic extensions. 737 ** 738 ** If anything goes wrong, set an error in the database connection. 739 */ 740 void sqlite3AutoLoadExtensions(sqlite3 *db){ 741 u32 i; 742 int go = 1; 743 int rc; 744 int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*); 745 746 wsdAutoextInit; 747 if( wsdAutoext.nExt==0 ){ 748 /* Common case: early out without every having to acquire a mutex */ 749 return; 750 } 751 for(i=0; go; i++){ 752 char *zErrmsg; 753 #if SQLITE_THREADSAFE 754 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 755 #endif 756 sqlite3_mutex_enter(mutex); 757 if( i>=wsdAutoext.nExt ){ 758 xInit = 0; 759 go = 0; 760 }else{ 761 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 762 wsdAutoext.aExt[i]; 763 } 764 sqlite3_mutex_leave(mutex); 765 zErrmsg = 0; 766 if( xInit && (rc = xInit(db, &zErrmsg, &sqlite3Apis))!=0 ){ 767 sqlite3ErrorWithMsg(db, rc, 768 "automatic extension loading failed: %s", zErrmsg); 769 go = 0; 770 } 771 sqlite3_free(zErrmsg); 772 } 773 } 774