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 /* Version 3.9.0 and later */ 412 sqlite3_value_subtype, 413 sqlite3_result_subtype 414 }; 415 416 /* 417 ** Attempt to load an SQLite extension library contained in the file 418 ** zFile. The entry point is zProc. zProc may be 0 in which case a 419 ** default entry point name (sqlite3_extension_init) is used. Use 420 ** of the default name is recommended. 421 ** 422 ** Return SQLITE_OK on success and SQLITE_ERROR if something goes wrong. 423 ** 424 ** If an error occurs and pzErrMsg is not 0, then fill *pzErrMsg with 425 ** error message text. The calling function should free this memory 426 ** by calling sqlite3DbFree(db, ). 427 */ 428 static int sqlite3LoadExtension( 429 sqlite3 *db, /* Load the extension into this database connection */ 430 const char *zFile, /* Name of the shared library containing extension */ 431 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 432 char **pzErrMsg /* Put error message here if not 0 */ 433 ){ 434 sqlite3_vfs *pVfs = db->pVfs; 435 void *handle; 436 int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*); 437 char *zErrmsg = 0; 438 const char *zEntry; 439 char *zAltEntry = 0; 440 void **aHandle; 441 u64 nMsg = 300 + sqlite3Strlen30(zFile); 442 int ii; 443 444 /* Shared library endings to try if zFile cannot be loaded as written */ 445 static const char *azEndings[] = { 446 #if SQLITE_OS_WIN 447 "dll" 448 #elif defined(__APPLE__) 449 "dylib" 450 #else 451 "so" 452 #endif 453 }; 454 455 456 if( pzErrMsg ) *pzErrMsg = 0; 457 458 /* Ticket #1863. To avoid a creating security problems for older 459 ** applications that relink against newer versions of SQLite, the 460 ** ability to run load_extension is turned off by default. One 461 ** must call sqlite3_enable_load_extension() to turn on extension 462 ** loading. Otherwise you get the following error. 463 */ 464 if( (db->flags & SQLITE_LoadExtension)==0 ){ 465 if( pzErrMsg ){ 466 *pzErrMsg = sqlite3_mprintf("not authorized"); 467 } 468 return SQLITE_ERROR; 469 } 470 471 zEntry = zProc ? zProc : "sqlite3_extension_init"; 472 473 handle = sqlite3OsDlOpen(pVfs, zFile); 474 #if SQLITE_OS_UNIX || SQLITE_OS_WIN 475 for(ii=0; ii<ArraySize(azEndings) && handle==0; ii++){ 476 char *zAltFile = sqlite3_mprintf("%s.%s", zFile, azEndings[ii]); 477 if( zAltFile==0 ) return SQLITE_NOMEM; 478 handle = sqlite3OsDlOpen(pVfs, zAltFile); 479 sqlite3_free(zAltFile); 480 } 481 #endif 482 if( handle==0 ){ 483 if( pzErrMsg ){ 484 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 485 if( zErrmsg ){ 486 sqlite3_snprintf(nMsg, zErrmsg, 487 "unable to open shared library [%s]", zFile); 488 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 489 } 490 } 491 return SQLITE_ERROR; 492 } 493 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 494 sqlite3OsDlSym(pVfs, handle, zEntry); 495 496 /* If no entry point was specified and the default legacy 497 ** entry point name "sqlite3_extension_init" was not found, then 498 ** construct an entry point name "sqlite3_X_init" where the X is 499 ** replaced by the lowercase value of every ASCII alphabetic 500 ** character in the filename after the last "/" upto the first ".", 501 ** and eliding the first three characters if they are "lib". 502 ** Examples: 503 ** 504 ** /usr/local/lib/libExample5.4.3.so ==> sqlite3_example_init 505 ** C:/lib/mathfuncs.dll ==> sqlite3_mathfuncs_init 506 */ 507 if( xInit==0 && zProc==0 ){ 508 int iFile, iEntry, c; 509 int ncFile = sqlite3Strlen30(zFile); 510 zAltEntry = sqlite3_malloc64(ncFile+30); 511 if( zAltEntry==0 ){ 512 sqlite3OsDlClose(pVfs, handle); 513 return SQLITE_NOMEM; 514 } 515 memcpy(zAltEntry, "sqlite3_", 8); 516 for(iFile=ncFile-1; iFile>=0 && zFile[iFile]!='/'; iFile--){} 517 iFile++; 518 if( sqlite3_strnicmp(zFile+iFile, "lib", 3)==0 ) iFile += 3; 519 for(iEntry=8; (c = zFile[iFile])!=0 && c!='.'; iFile++){ 520 if( sqlite3Isalpha(c) ){ 521 zAltEntry[iEntry++] = (char)sqlite3UpperToLower[(unsigned)c]; 522 } 523 } 524 memcpy(zAltEntry+iEntry, "_init", 6); 525 zEntry = zAltEntry; 526 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 527 sqlite3OsDlSym(pVfs, handle, zEntry); 528 } 529 if( xInit==0 ){ 530 if( pzErrMsg ){ 531 nMsg += sqlite3Strlen30(zEntry); 532 *pzErrMsg = zErrmsg = sqlite3_malloc64(nMsg); 533 if( zErrmsg ){ 534 sqlite3_snprintf(nMsg, zErrmsg, 535 "no entry point [%s] in shared library [%s]", zEntry, zFile); 536 sqlite3OsDlError(pVfs, nMsg-1, zErrmsg); 537 } 538 } 539 sqlite3OsDlClose(pVfs, handle); 540 sqlite3_free(zAltEntry); 541 return SQLITE_ERROR; 542 } 543 sqlite3_free(zAltEntry); 544 if( xInit(db, &zErrmsg, &sqlite3Apis) ){ 545 if( pzErrMsg ){ 546 *pzErrMsg = sqlite3_mprintf("error during initialization: %s", zErrmsg); 547 } 548 sqlite3_free(zErrmsg); 549 sqlite3OsDlClose(pVfs, handle); 550 return SQLITE_ERROR; 551 } 552 553 /* Append the new shared library handle to the db->aExtension array. */ 554 aHandle = sqlite3DbMallocZero(db, sizeof(handle)*(db->nExtension+1)); 555 if( aHandle==0 ){ 556 return SQLITE_NOMEM; 557 } 558 if( db->nExtension>0 ){ 559 memcpy(aHandle, db->aExtension, sizeof(handle)*db->nExtension); 560 } 561 sqlite3DbFree(db, db->aExtension); 562 db->aExtension = aHandle; 563 564 db->aExtension[db->nExtension++] = handle; 565 return SQLITE_OK; 566 } 567 int sqlite3_load_extension( 568 sqlite3 *db, /* Load the extension into this database connection */ 569 const char *zFile, /* Name of the shared library containing extension */ 570 const char *zProc, /* Entry point. Use "sqlite3_extension_init" if 0 */ 571 char **pzErrMsg /* Put error message here if not 0 */ 572 ){ 573 int rc; 574 sqlite3_mutex_enter(db->mutex); 575 rc = sqlite3LoadExtension(db, zFile, zProc, pzErrMsg); 576 rc = sqlite3ApiExit(db, rc); 577 sqlite3_mutex_leave(db->mutex); 578 return rc; 579 } 580 581 /* 582 ** Call this routine when the database connection is closing in order 583 ** to clean up loaded extensions 584 */ 585 void sqlite3CloseExtensions(sqlite3 *db){ 586 int i; 587 assert( sqlite3_mutex_held(db->mutex) ); 588 for(i=0; i<db->nExtension; i++){ 589 sqlite3OsDlClose(db->pVfs, db->aExtension[i]); 590 } 591 sqlite3DbFree(db, db->aExtension); 592 } 593 594 /* 595 ** Enable or disable extension loading. Extension loading is disabled by 596 ** default so as not to open security holes in older applications. 597 */ 598 int sqlite3_enable_load_extension(sqlite3 *db, int onoff){ 599 sqlite3_mutex_enter(db->mutex); 600 if( onoff ){ 601 db->flags |= SQLITE_LoadExtension; 602 }else{ 603 db->flags &= ~SQLITE_LoadExtension; 604 } 605 sqlite3_mutex_leave(db->mutex); 606 return SQLITE_OK; 607 } 608 609 #endif /* SQLITE_OMIT_LOAD_EXTENSION */ 610 611 /* 612 ** The auto-extension code added regardless of whether or not extension 613 ** loading is supported. We need a dummy sqlite3Apis pointer for that 614 ** code if regular extension loading is not available. This is that 615 ** dummy pointer. 616 */ 617 #ifdef SQLITE_OMIT_LOAD_EXTENSION 618 static const sqlite3_api_routines sqlite3Apis = { 0 }; 619 #endif 620 621 622 /* 623 ** The following object holds the list of automatically loaded 624 ** extensions. 625 ** 626 ** This list is shared across threads. The SQLITE_MUTEX_STATIC_MASTER 627 ** mutex must be held while accessing this list. 628 */ 629 typedef struct sqlite3AutoExtList sqlite3AutoExtList; 630 static SQLITE_WSD struct sqlite3AutoExtList { 631 u32 nExt; /* Number of entries in aExt[] */ 632 void (**aExt)(void); /* Pointers to the extension init functions */ 633 } sqlite3Autoext = { 0, 0 }; 634 635 /* The "wsdAutoext" macro will resolve to the autoextension 636 ** state vector. If writable static data is unsupported on the target, 637 ** we have to locate the state vector at run-time. In the more common 638 ** case where writable static data is supported, wsdStat can refer directly 639 ** to the "sqlite3Autoext" state vector declared above. 640 */ 641 #ifdef SQLITE_OMIT_WSD 642 # define wsdAutoextInit \ 643 sqlite3AutoExtList *x = &GLOBAL(sqlite3AutoExtList,sqlite3Autoext) 644 # define wsdAutoext x[0] 645 #else 646 # define wsdAutoextInit 647 # define wsdAutoext sqlite3Autoext 648 #endif 649 650 651 /* 652 ** Register a statically linked extension that is automatically 653 ** loaded by every new database connection. 654 */ 655 int sqlite3_auto_extension(void (*xInit)(void)){ 656 int rc = SQLITE_OK; 657 #ifndef SQLITE_OMIT_AUTOINIT 658 rc = sqlite3_initialize(); 659 if( rc ){ 660 return rc; 661 }else 662 #endif 663 { 664 u32 i; 665 #if SQLITE_THREADSAFE 666 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 667 #endif 668 wsdAutoextInit; 669 sqlite3_mutex_enter(mutex); 670 for(i=0; i<wsdAutoext.nExt; i++){ 671 if( wsdAutoext.aExt[i]==xInit ) break; 672 } 673 if( i==wsdAutoext.nExt ){ 674 u64 nByte = (wsdAutoext.nExt+1)*sizeof(wsdAutoext.aExt[0]); 675 void (**aNew)(void); 676 aNew = sqlite3_realloc64(wsdAutoext.aExt, nByte); 677 if( aNew==0 ){ 678 rc = SQLITE_NOMEM; 679 }else{ 680 wsdAutoext.aExt = aNew; 681 wsdAutoext.aExt[wsdAutoext.nExt] = xInit; 682 wsdAutoext.nExt++; 683 } 684 } 685 sqlite3_mutex_leave(mutex); 686 assert( (rc&0xff)==rc ); 687 return rc; 688 } 689 } 690 691 /* 692 ** Cancel a prior call to sqlite3_auto_extension. Remove xInit from the 693 ** set of routines that is invoked for each new database connection, if it 694 ** is currently on the list. If xInit is not on the list, then this 695 ** routine is a no-op. 696 ** 697 ** Return 1 if xInit was found on the list and removed. Return 0 if xInit 698 ** was not on the list. 699 */ 700 int sqlite3_cancel_auto_extension(void (*xInit)(void)){ 701 #if SQLITE_THREADSAFE 702 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 703 #endif 704 int i; 705 int n = 0; 706 wsdAutoextInit; 707 sqlite3_mutex_enter(mutex); 708 for(i=(int)wsdAutoext.nExt-1; i>=0; i--){ 709 if( wsdAutoext.aExt[i]==xInit ){ 710 wsdAutoext.nExt--; 711 wsdAutoext.aExt[i] = wsdAutoext.aExt[wsdAutoext.nExt]; 712 n++; 713 break; 714 } 715 } 716 sqlite3_mutex_leave(mutex); 717 return n; 718 } 719 720 /* 721 ** Reset the automatic extension loading mechanism. 722 */ 723 void sqlite3_reset_auto_extension(void){ 724 #ifndef SQLITE_OMIT_AUTOINIT 725 if( sqlite3_initialize()==SQLITE_OK ) 726 #endif 727 { 728 #if SQLITE_THREADSAFE 729 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 730 #endif 731 wsdAutoextInit; 732 sqlite3_mutex_enter(mutex); 733 sqlite3_free(wsdAutoext.aExt); 734 wsdAutoext.aExt = 0; 735 wsdAutoext.nExt = 0; 736 sqlite3_mutex_leave(mutex); 737 } 738 } 739 740 /* 741 ** Load all automatic extensions. 742 ** 743 ** If anything goes wrong, set an error in the database connection. 744 */ 745 void sqlite3AutoLoadExtensions(sqlite3 *db){ 746 u32 i; 747 int go = 1; 748 int rc; 749 int (*xInit)(sqlite3*,char**,const sqlite3_api_routines*); 750 751 wsdAutoextInit; 752 if( wsdAutoext.nExt==0 ){ 753 /* Common case: early out without every having to acquire a mutex */ 754 return; 755 } 756 for(i=0; go; i++){ 757 char *zErrmsg; 758 #if SQLITE_THREADSAFE 759 sqlite3_mutex *mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); 760 #endif 761 sqlite3_mutex_enter(mutex); 762 if( i>=wsdAutoext.nExt ){ 763 xInit = 0; 764 go = 0; 765 }else{ 766 xInit = (int(*)(sqlite3*,char**,const sqlite3_api_routines*)) 767 wsdAutoext.aExt[i]; 768 } 769 sqlite3_mutex_leave(mutex); 770 zErrmsg = 0; 771 if( xInit && (rc = xInit(db, &zErrmsg, &sqlite3Apis))!=0 ){ 772 sqlite3ErrorWithMsg(db, rc, 773 "automatic extension loading failed: %s", zErrmsg); 774 go = 0; 775 } 776 sqlite3_free(zErrmsg); 777 } 778 } 779