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 sqlite3_result_zeroblob64, 410 sqlite3_bind_zeroblob64 411 }; 412 413 /* 414 ** Attempt to load an SQLite extension library contained in the file 415 ** zFile. The entry point is zProc. zProc may be 0 in which case a 416 ** default entry point name (sqlite3_extension_init) is used. Use 417 ** of the default name is recommended. 418 ** 419 ** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong. 420 ** 421 ** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with 422 ** error message text. The calling function should free this memory 423 ** by calling sqlite3DbFree(db, ). 424 */ 425 static int sqlite3LoadExtension( 426 sqlite3 *db, /* Load the extension into this database connection */ 427 const char *zFile, /* Name of the shared library containing extension */ 428 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 429 char **pzErrMsg /* Put error message here if not 0 */ 430 ){ 431 sqlite3_vfs *pVfs = db->pVfs; 432 void *handle; 433 int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*); 434 char *zErrmsg = 0; 435 const char *zEntry; 436 char *zAltEntry = 0; 437 void **aHandle; 438 u64 nMsg = 300 + sqlite3Strlen30(zFile); 439 int ii; 440 441 /* Shared library endings to try if zFile cannot be loaded as written */ 442 static const char *azEndings[] = { 443 #if SQLITE_OS_WIN 444 "dll" 445 #elif defined(__APPLE__) 446 "dylib" 447 #else 448 "so" 449 #endif 450 }; 451 452 453 if( pzErrMsg ) *pzErrMsg = 0; 454 455 /* Ticket #1863. To avoid a creating security problems for older 456 ** applications that relink against newer versions of SQLite, the 457 ** ability to run load_extension is turned off by default. One 458 ** must call sqlite3_enable_load_extension() to turn on extension 459 ** loading. Otherwise you get the following error. 460 */ 461 if( (db->flags & SQLITE_LoadExtension)==0 ){ 462 if( pzErrMsg ){ 463 *pzErrMsg = sqlite3_mprintf("not authorized"); 464 } 465 return SQLITE_ERROR; 466 } 467 468 zEntry = zProc ? zProc : "sqlite3_extension_init"; 469 470 handle = sqlite3OsDlOpen(pVfs, zFile); 471 #if SQLITE_OS_UNIX || SQLITE_OS_WIN 472 for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){ 473 char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]); 474 if( zAltFile==0 ) return SQLITE_NOMEM; 475 handle = sqlite3OsDlOpen(pVfs, zAltFile); 476 sqlite3_free(zAltFile); 477 } 478 #endif 479 if( handle==0 ){ 480 if( pzErrMsg ){ 481 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 482 if( zErrmsg ){ 483 sqlite3_snprintf(nMsg, zErrmsg, 484 "unable to open shared library [%s]", zFile); 485 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 486 } 487 } 488 return SQLITE_ERROR; 489 } 490 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 491 sqlite3OsDlSym(pVfs, handle, zEntry); 492 493 /* If no entry point was specified and the default legacy 494 ** entry point name "sqlite3_extension_init" was not found, then 495 ** construct an entry point name "sqlite3_X_init" where the X is 496 ** replaced by the lowercase value of every ASCII alphabetic 497 ** character in the filename after the last "/" upto the first ".", 498 ** and eliding the first three characters if they are "lib". 499 ** Examples: 500 ** 501 ** /usr/local/lib/libExample5.4.3.so ==> sqlite3_example_init 502 ** C:/lib/mathfuncs.dll ==> sqlite3_mathfuncs_init 503 */ 504 if( xInit==0 && zProc==0 ){ 505 int iFile, iEntry, c; 506 int ncFile = sqlite3Strlen30(zFile); 507 zAltEntry = sqlite3_malloc64(ncFile+30); 508 if( zAltEntry==0 ){ 509 sqlite3OsDlClose(pVfs, handle); 510 return SQLITE_NOMEM; 511 } 512 memcpy(zAltEntry, "sqlite3_", 8); 513 for(iFile=ncFile-1; iFile>=0 && zFile[iFile]!='/'; iFile--){} 514 iFile++; 515 if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3; 516 for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){ 517 if( sqlite3Isalpha(c) ){ 518 zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c]; 519 } 520 } 521 memcpy(zAltEntry+iEntry, "_init", 6); 522 zEntry = zAltEntry; 523 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 524 sqlite3OsDlSym(pVfs, handle, zEntry); 525 } 526 if( xInit==0 ){ 527 if( pzErrMsg ){ 528 nMsg += sqlite3Strlen30(zEntry); 529 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 530 if( zErrmsg ){ 531 sqlite3_snprintf(nMsg, zErrmsg, 532 "no entry point [%s] in shared library [%s]", zEntry, zFile); 533 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 534 } 535 } 536 sqlite3OsDlClose(pVfs, handle); 537 sqlite3_free(zAltEntry); 538 return SQLITE_ERROR; 539 } 540 sqlite3_free(zAltEntry); 541 if( xInit(db, &zErrmsg, &sqlite3Apis) ){ 542 if( pzErrMsg ){ 543 *pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg); 544 } 545 sqlite3_free(zErrmsg); 546 sqlite3OsDlClose(pVfs, handle); 547 return SQLITE_ERROR; 548 } 549 550 /* Append the new shared library handle to the db->aExtension array. */ 551 aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1)); 552 if( aHandle==0 ){ 553 return SQLITE_NOMEM; 554 } 555 if( db->nExtension>0 ){ 556 memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension); 557 } 558 sqlite3DbFree(db, db->aExtension); 559 db->aExtension = aHandle; 560 561 db->aExtension[db->nExtension++] = handle; 562 return SQLITE_OK; 563 } 564 int sqlite3_load_extension( 565 sqlite3 *db, /* Load the extension into this database connection */ 566 const char *zFile, /* Name of the shared library containing extension */ 567 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 568 char **pzErrMsg /* Put error message here if not 0 */ 569 ){ 570 int rc; 571 sqlite3_mutex_enter(db->mutex); 572 rc = sqlite3LoadExtension(db, zFile, zProc, pzErrMsg); 573 rc = sqlite3ApiExit(db, rc); 574 sqlite3_mutex_leave(db->mutex); 575 return rc; 576 } 577 578 /* 579 ** Call this routine when the database connection is closing in order 580 ** to clean up loaded extensions 581 */ 582 void sqlite3CloseExtensions(sqlite3 *db){ 583 int i; 584 assert( sqlite3_mutex_held(db->mutex) ); 585 for(i=0; i<db->nExtension; i++){ 586 sqlite3OsDlClose(db->pVfs, db->aExtension[i]); 587 } 588 sqlite3DbFree(db, db->aExtension); 589 } 590 591 /* 592 ** Enable or disable extension loading. Extension loading is disabled by 593 ** default so as not to open security holes in older applications. 594 */ 595 int sqlite3_enable_load_extension(sqlite3 *db, int onoff){ 596 sqlite3_mutex_enter(db->mutex); 597 if( onoff ){ 598 db->flags |= SQLITE_LoadExtension; 599 }else{ 600 db->flags &= ~SQLITE_LoadExtension; 601 } 602 sqlite3_mutex_leave(db->mutex); 603 return SQLITE_OK; 604 } 605 606 #endif /* SQLITE_OMIT_LOAD_EXTENSION */ 607 608 /* 609 ** The auto-extension code added regardless of whether or not extension 610 ** loading is supported. We need a dummy sqlite3Apis pointer for that 611 ** code if regular extension loading is not available. This is that 612 ** dummy pointer. 613 */ 614 #ifdef SQLITE_OMIT_LOAD_EXTENSION 615 static const sqlite3_api_routines sqlite3Apis = { 0 }; 616 #endif 617 618 619 /* 620 ** The following object holds the list of automatically loaded 621 ** extensions. 622 ** 623 ** This list is shared across threads. The SQLITE_MUTEX_STATIC_MASTER 624 ** mutex must be held while accessing this list. 625 */ 626 typedef struct sqlite3AutoExtList sqlite3AutoExtList; 627 static SQLITE_WSD struct sqlite3AutoExtList { 628 u32 nExt; /* Number of entries in aExt[] */ 629 void (**aExt)(void); /* Pointers to the extension init functions */ 630 } sqlite3Autoext = { 0, 0 }; 631 632 /* The "wsdAutoext" macro will resolve to the autoextension 633 ** state vector. If writable static data is unsupported on the target, 634 ** we have to locate the state vector at run-time. In the more common 635 ** case where writable static data is supported, wsdStat can refer directly 636 ** to the "sqlite3Autoext" state vector declared above. 637 */ 638 #ifdef SQLITE_OMIT_WSD 639 # define wsdAutoextInit \ 640 sqlite3AutoExtList *x = &GLOBAL(sqlite3AutoExtList,sqlite3Autoext) 641 # define wsdAutoext x[0] 642 #else 643 # define wsdAutoextInit 644 # define wsdAutoext sqlite3Autoext 645 #endif 646 647 648 /* 649 ** Register a statically linked extension that is automatically 650 ** loaded by every new database connection. 651 */ 652 int sqlite3_auto_extension(void (*xInit)(void)){ 653 int rc = SQLITE_OK; 654 #ifndef SQLITE_OMIT_AUTOINIT 655 rc = sqlite3_initialize(); 656 if( rc ){ 657 return rc; 658 }else 659 #endif 660 { 661 u32 i; 662 #if SQLITE_THREADSAFE 663 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 664 #endif 665 wsdAutoextInit; 666 sqlite3_mutex_enter(mutex); 667 for(i=0; i<wsdAutoext.nExt; i++){ 668 if( wsdAutoext.aExt[i]==xInit ) break; 669 } 670 if( i==wsdAutoext.nExt ){ 671 u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]); 672 void (**aNew)(void); 673 aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte); 674 if( aNew==0 ){ 675 rc = SQLITE_NOMEM; 676 }else{ 677 wsdAutoext.aExt = aNew; 678 wsdAutoext.aExt[wsdAutoext.nExt] = xInit; 679 wsdAutoext.nExt++; 680 } 681 } 682 sqlite3_mutex_leave(mutex); 683 assert( (rc&0xff)==rc ); 684 return rc; 685 } 686 } 687 688 /* 689 ** Cancel a prior call to sqlite3_auto_extension. Remove xInit from the 690 ** set of routines that is invoked for each new database connection, if it 691 ** is currently on the list. If xInit is not on the list, then this 692 ** routine is a no-op. 693 ** 694 ** Return 1 if xInit was found on the list and removed. Return 0 if xInit 695 ** was not on the list. 696 */ 697 int sqlite3_cancel_auto_extension(void (*xInit)(void)){ 698 #if SQLITE_THREADSAFE 699 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 700 #endif 701 int i; 702 int n = 0; 703 wsdAutoextInit; 704 sqlite3_mutex_enter(mutex); 705 for(i=(int)wsdAutoext.nExt-1; i>=0; i--){ 706 if( wsdAutoext.aExt[i]==xInit ){ 707 wsdAutoext.nExt--; 708 wsdAutoext.aExt[i] = wsdAutoext.aExt[wsdAutoext.nExt]; 709 n++; 710 break; 711 } 712 } 713 sqlite3_mutex_leave(mutex); 714 return n; 715 } 716 717 /* 718 ** Reset the automatic extension loading mechanism. 719 */ 720 void sqlite3_reset_auto_extension(void){ 721 #ifndef SQLITE_OMIT_AUTOINIT 722 if( sqlite3_initialize()==SQLITE_OK ) 723 #endif 724 { 725 #if SQLITE_THREADSAFE 726 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 727 #endif 728 wsdAutoextInit; 729 sqlite3_mutex_enter(mutex); 730 sqlite3_free(wsdAutoext.aExt); 731 wsdAutoext.aExt = 0; 732 wsdAutoext.nExt = 0; 733 sqlite3_mutex_leave(mutex); 734 } 735 } 736 737 /* 738 ** Load all automatic extensions. 739 ** 740 ** If anything goes wrong, set an error in the database connection. 741 */ 742 void sqlite3AutoLoadExtensions(sqlite3 *db){ 743 u32 i; 744 int go = 1; 745 int rc; 746 int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*); 747 748 wsdAutoextInit; 749 if( wsdAutoext.nExt==0 ){ 750 /* Common case: early out without every having to acquire a mutex */ 751 return; 752 } 753 for(i=0; go; i++){ 754 char *zErrmsg; 755 #if SQLITE_THREADSAFE 756 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 757 #endif 758 sqlite3_mutex_enter(mutex); 759 if( i>=wsdAutoext.nExt ){ 760 xInit = 0; 761 go = 0; 762 }else{ 763 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 764 wsdAutoext.aExt[i]; 765 } 766 sqlite3_mutex_leave(mutex); 767 zErrmsg = 0; 768 if( xInit && (rc = xInit(db, &zErrmsg, &sqlite3Apis))!=0 ){ 769 sqlite3ErrorWithMsg(db, rc, 770 "automatic extension loading failed: %s", zErrmsg); 771 go = 0; 772 } 773 sqlite3_free(zErrmsg); 774 } 775 } 776