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GeezerVison is showing github.com — sqlcipher/src/main.c at master · magic-coder/sqlcipher Expand file tree/ Copy pathmain.cMore file actions 4173 lines (3884 loc) · 132 KB / Copy pathmain.cFile metadata and controls4173 lines (3884 loc) · 132 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 /* ** 2001 September 15 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** Main file for the SQLite library. The routines in this file ** implement the programmer interface to the library. Routines in ** other files are for internal use by SQLite and should not be ** accessed by users of the library. */ #include "sqliteInt.h" #ifdef SQLITE_ENABLE_FTS3 # include "fts3.h" #endif #ifdef SQLITE_ENABLE_RTREE # include "rtree.h" #endif #ifdef SQLITE_ENABLE_ICU # include "sqliteicu.h" #endif #ifdef SQLITE_ENABLE_JSON1 int sqlite3Json1Init(sqlite3*); #endif #ifdef SQLITE_ENABLE_STMTVTAB int sqlite3StmtVtabInit(sqlite3*); #endif #ifdef SQLITE_ENABLE_FTS5 int sqlite3Fts5Init(sqlite3*); #endif #ifndef SQLITE_AMALGAMATION /* IMPLEMENTATION-OF: R-46656-45156 The sqlite3_version[] string constant ** contains the text of SQLITE_VERSION macro. */ const char sqlite3_version[] = SQLITE_VERSION; #endif /* IMPLEMENTATION-OF: R-53536-42575 The sqlite3_libversion() function returns ** a pointer to the to the sqlite3_version[] string constant. */ const char *sqlite3_libversion(void){ return sqlite3_version; } /* IMPLEMENTATION-OF: R-63124-39300 The sqlite3_sourceid() function returns a ** pointer to a string constant whose value is the same as the ** SQLITE_SOURCE_ID C preprocessor macro. */ const char *sqlite3_sourceid(void){ return SQLITE_SOURCE_ID; } /* IMPLEMENTATION-OF: R-35210-63508 The sqlite3_libversion_number() function ** returns an integer equal to SQLITE_VERSION_NUMBER. */ int sqlite3_libversion_number(void){ return SQLITE_VERSION_NUMBER; } /* IMPLEMENTATION-OF: R-20790-14025 The sqlite3_threadsafe() function returns ** zero if and only if SQLite was compiled with mutexing code omitted due to ** the SQLITE_THREADSAFE compile-time option being set to 0. */ int sqlite3_threadsafe(void){ return SQLITE_THREADSAFE; } /* ** When compiling the test fixture or with debugging enabled (on Win32), ** this variable being set to non-zero will cause OSTRACE macros to emit ** extra diagnostic information. */ #ifdef SQLITE_HAVE_OS_TRACE # ifndef SQLITE_DEBUG_OS_TRACE # define SQLITE_DEBUG_OS_TRACE 0 # endif int sqlite3OSTrace = SQLITE_DEBUG_OS_TRACE; #endif #if !defined(SQLITE_OMIT_TRACE) && defined(SQLITE_ENABLE_IOTRACE) /* ** If the following function pointer is not NULL and if ** SQLITE_ENABLE_IOTRACE is enabled, then messages describing ** I/O active are written using this function. These messages ** are intended for debugging activity only. */ SQLITE_API void (SQLITE_CDECL *sqlite3IoTrace)(const char*, ...) = 0; #endif /* ** If the following global variable points to a string which is the ** name of a directory, then that directory will be used to store ** temporary files. ** ** See also the "PRAGMA temp_store_directory" SQL command. */ char *sqlite3_temp_directory = 0; /* ** If the following global variable points to a string which is the ** name of a directory, then that directory will be used to store ** all database files specified with a relative pathname. ** ** See also the "PRAGMA data_store_directory" SQL command. */ char *sqlite3_data_directory = 0; /* ** Initialize SQLite. ** ** This routine must be called to initialize the memory allocation, ** VFS, and mutex subsystems prior to doing any serious work with ** SQLite. But as long as you do not compile with SQLITE_OMIT_AUTOINIT ** this routine will be called automatically by key routines such as ** sqlite3_open(). ** ** This routine is a no-op except on its very first call for the process, ** or for the first call after a call to sqlite3_shutdown. ** ** The first thread to call this routine runs the initialization to ** completion. If subsequent threads call this routine before the first ** thread has finished the initialization process, then the subsequent ** threads must block until the first thread finishes with the initialization. ** ** The first thread might call this routine recursively. Recursive ** calls to this routine should not block, of course. Otherwise the ** initialization process would never complete. ** ** Let X be the first thread to enter this routine. Let Y be some other ** thread. Then while the initial invocation of this routine by X is ** incomplete, it is required that: ** ** * Calls to this routine from Y must block until the outer-most ** call by X completes. ** ** * Recursive calls to this routine from thread X return immediately ** without blocking. */ int sqlite3_initialize(void){ MUTEX_LOGIC( sqlite3_mutex *pMaster; ) /* The main static mutex */ int rc; /* Result code */ #ifdef SQLITE_EXTRA_INIT int bRunExtraInit = 0; /* Extra initialization needed */ #endif #ifdef SQLITE_OMIT_WSD rc = sqlite3_wsd_init(4096, 24); if( rc!=SQLITE_OK ){ return rc; } #endif /* If the following assert() fails on some obscure processor/compiler ** combination, the work-around is to set the correct pointer ** size at compile-time using -DSQLITE_PTRSIZE=n compile-time option */ assert( SQLITE_PTRSIZE==sizeof(char*) ); /* If SQLite is already completely initialized, then this call ** to sqlite3_initialize() should be a no-op. But the initialization ** must be complete. So isInit must not be set until the very end ** of this routine. */ if( sqlite3GlobalConfig.isInit ) return SQLITE_OK; /* Make sure the mutex subsystem is initialized. If unable to ** initialize the mutex subsystem, return early with the error. ** If the system is so sick that we are unable to allocate a mutex, ** there is not much SQLite is going to be able to do. ** ** The mutex subsystem must take care of serializing its own ** initialization. */ rc = sqlite3MutexInit(); if( rc ) return rc; /* Initialize the malloc() system and the recursive pInitMutex mutex. ** This operation is protected by the STATIC_MASTER mutex. Note that ** MutexAlloc() is called for a static mutex prior to initializing the ** malloc subsystem - this implies that the allocation of a static ** mutex must not require support from the malloc subsystem. */ MUTEX_LOGIC( pMaster = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MASTER); ) sqlite3_mutex_enter(pMaster); sqlite3GlobalConfig.isMutexInit = 1; if( !sqlite3GlobalConfig.isMallocInit ){ rc = sqlite3MallocInit(); } if( rc==SQLITE_OK ){ sqlite3GlobalConfig.isMallocInit = 1; if( !sqlite3GlobalConfig.pInitMutex ){ sqlite3GlobalConfig.pInitMutex = sqlite3MutexAlloc(SQLITE_MUTEX_RECURSIVE); if( sqlite3GlobalConfig.bCoreMutex && !sqlite3GlobalConfig.pInitMutex ){ rc = SQLITE_NOMEM_BKPT; } } } if( rc==SQLITE_OK ){ sqlite3GlobalConfig.nRefInitMutex++; } sqlite3_mutex_leave(pMaster); /* If rc is not SQLITE_OK at this point, then either the malloc ** subsystem could not be initialized or the system failed to allocate ** the pInitMutex mutex. Return an error in either case. */ if( rc!=SQLITE_OK ){ return rc; } /* Do the rest of the initialization under the recursive mutex so ** that we will be able to handle recursive calls into ** sqlite3_initialize(). The recursive calls normally come through ** sqlite3_os_init() when it invokes sqlite3_vfs_register(), but other ** recursive calls might also be possible. ** ** IMPLEMENTATION-OF: R-00140-37445 SQLite automatically serializes calls ** to the xInit method, so the xInit method need not be threadsafe. ** ** The following mutex is what serializes access to the appdef pcache xInit ** methods. The sqlite3_pcache_methods.xInit() all is embedded in the ** call to sqlite3PcacheInitialize(). */ sqlite3_mutex_enter(sqlite3GlobalConfig.pInitMutex); if( sqlite3GlobalConfig.isInit==0 && sqlite3GlobalConfig.inProgress==0 ){ sqlite3GlobalConfig.inProgress = 1; #ifdef SQLITE_ENABLE_SQLLOG { extern void sqlite3_init_sqllog(void); sqlite3_init_sqllog(); } #endif memset(&sqlite3BuiltinFunctions, 0, sizeof(sqlite3BuiltinFunctions)); sqlite3RegisterBuiltinFunctions(); if( sqlite3GlobalConfig.isPCacheInit==0 ){ rc = sqlite3PcacheInitialize(); } if( rc==SQLITE_OK ){ sqlite3GlobalConfig.isPCacheInit = 1; rc = sqlite3OsInit(); } if( rc==SQLITE_OK ){ sqlite3PCacheBufferSetup( sqlite3GlobalConfig.pPage, sqlite3GlobalConfig.szPage, sqlite3GlobalConfig.nPage); sqlite3GlobalConfig.isInit = 1; #ifdef SQLITE_EXTRA_INIT bRunExtraInit = 1; #endif } sqlite3GlobalConfig.inProgress = 0; } sqlite3_mutex_leave(sqlite3GlobalConfig.pInitMutex); /* Go back under the static mutex and clean up the recursive ** mutex to prevent a resource leak. */ sqlite3_mutex_enter(pMaster); sqlite3GlobalConfig.nRefInitMutex--; if( sqlite3GlobalConfig.nRefInitMutex<=0 ){ assert( sqlite3GlobalConfig.nRefInitMutex==0 ); sqlite3_mutex_free(sqlite3GlobalConfig.pInitMutex); sqlite3GlobalConfig.pInitMutex = 0; } sqlite3_mutex_leave(pMaster); /* The following is just a sanity check to make sure SQLite has ** been compiled correctly. It is important to run this code, but ** we don't want to run it too often and soak up CPU cycles for no ** reason. So we run it once during initialization. */ #ifndef NDEBUG #ifndef SQLITE_OMIT_FLOATING_POINT /* This section of code's only "output" is via assert() statements. */ if ( rc==SQLITE_OK ){ u64 x = (((u64)1)<<63)-1; double y; assert(sizeof(x)==8); assert(sizeof(x)==sizeof(y)); memcpy(&y, &x, 8); assert( sqlite3IsNaN(y) ); } #endif #endif /* Do extra initialization steps requested by the SQLITE_EXTRA_INIT ** compile-time option. */ #ifdef SQLITE_EXTRA_INIT if( bRunExtraInit ){ int SQLITE_EXTRA_INIT(const char*); rc = SQLITE_EXTRA_INIT(0); } #endif return rc; } /* ** Undo the effects of sqlite3_initialize(). Must not be called while ** there are outstanding database connections or memory allocations or ** while any part of SQLite is otherwise in use in any thread. This ** routine is not threadsafe. But it is safe to invoke this routine ** on when SQLite is already shut down. If SQLite is already shut down ** when this routine is invoked, then this routine is a harmless no-op. */ int sqlite3_shutdown(void){ #ifdef SQLITE_OMIT_WSD int rc = sqlite3_wsd_init(4096, 24); if( rc!=SQLITE_OK ){ return rc; } #endif if( sqlite3GlobalConfig.isInit ){ #ifdef SQLITE_EXTRA_SHUTDOWN void SQLITE_EXTRA_SHUTDOWN(void); SQLITE_EXTRA_SHUTDOWN(); #endif sqlite3_os_end(); sqlite3_reset_auto_extension(); sqlite3GlobalConfig.isInit = 0; } if( sqlite3GlobalConfig.isPCacheInit ){ sqlite3PcacheShutdown(); sqlite3GlobalConfig.isPCacheInit = 0; } if( sqlite3GlobalConfig.isMallocInit ){ sqlite3MallocEnd(); sqlite3GlobalConfig.isMallocInit = 0; #ifndef SQLITE_OMIT_SHUTDOWN_DIRECTORIES /* The heap subsystem has now been shutdown and these values are supposed ** to be NULL or point to memory that was obtained from sqlite3_malloc(), ** which would rely on that heap subsystem; therefore, make sure these ** values cannot refer to heap memory that was just invalidated when the ** heap subsystem was shutdown. This is only done if the current call to ** this function resulted in the heap subsystem actually being shutdown. */ sqlite3_data_directory = 0; sqlite3_temp_directory = 0; #endif } if( sqlite3GlobalConfig.isMutexInit ){ sqlite3MutexEnd(); sqlite3GlobalConfig.isMutexInit = 0; } return SQLITE_OK; } /* ** This API allows applications to modify the global configuration of ** the SQLite library at run-time. ** ** This routine should only be called when there are no outstanding ** database connections or memory allocations. This routine is not ** threadsafe. Failure to heed these warnings can lead to unpredictable ** behavior. */ int sqlite3_config(int op, ...){ va_list ap; int rc = SQLITE_OK; /* sqlite3_config() shall return SQLITE_MISUSE if it is invoked while ** the SQLite library is in use. */ if( sqlite3GlobalConfig.isInit ) return SQLITE_MISUSE_BKPT; va_start(ap, op); switch( op ){ /* Mutex configuration options are only available in a threadsafe ** compile. */ #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-54466-46756 */ case SQLITE_CONFIG_SINGLETHREAD: { /* EVIDENCE-OF: R-02748-19096 This option sets the threading mode to ** Single-thread. */ sqlite3GlobalConfig.bCoreMutex = 0; /* Disable mutex on core */ sqlite3GlobalConfig.bFullMutex = 0; /* Disable mutex on connections */ break; } #endif #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-20520-54086 */ case SQLITE_CONFIG_MULTITHREAD: { /* EVIDENCE-OF: R-14374-42468 This option sets the threading mode to ** Multi-thread. */ sqlite3GlobalConfig.bCoreMutex = 1; /* Enable mutex on core */ sqlite3GlobalConfig.bFullMutex = 0; /* Disable mutex on connections */ break; } #endif #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-59593-21810 */ case SQLITE_CONFIG_SERIALIZED: { /* EVIDENCE-OF: R-41220-51800 This option sets the threading mode to ** Serialized. */ sqlite3GlobalConfig.bCoreMutex = 1; /* Enable mutex on core */ sqlite3GlobalConfig.bFullMutex = 1; /* Enable mutex on connections */ break; } #endif #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-63666-48755 */ case SQLITE_CONFIG_MUTEX: { /* Specify an alternative mutex implementation */ sqlite3GlobalConfig.mutex = *va_arg(ap, sqlite3_mutex_methods*); break; } #endif #if defined(SQLITE_THREADSAFE) && SQLITE_THREADSAFE>0 /* IMP: R-14450-37597 */ case SQLITE_CONFIG_GETMUTEX: { /* Retrieve the current mutex implementation */ *va_arg(ap, sqlite3_mutex_methods*) = sqlite3GlobalConfig.mutex; break; } #endif case SQLITE_CONFIG_MALLOC: { /* EVIDENCE-OF: R-55594-21030 The SQLITE_CONFIG_MALLOC option takes a ** single argument which is a pointer to an instance of the ** sqlite3_mem_methods structure. The argument specifies alternative ** low-level memory allocation routines to be used in place of the memory ** allocation routines built into SQLite. */ sqlite3GlobalConfig.m = *va_arg(ap, sqlite3_mem_methods*); break; } case SQLITE_CONFIG_GETMALLOC: { /* EVIDENCE-OF: R-51213-46414 The SQLITE_CONFIG_GETMALLOC option takes a ** single argument which is a pointer to an instance of the ** sqlite3_mem_methods structure. The sqlite3_mem_methods structure is ** filled with the currently defined memory allocation routines. */ if( sqlite3GlobalConfig.m.xMalloc==0 ) sqlite3MemSetDefault(); *va_arg(ap, sqlite3_mem_methods*) = sqlite3GlobalConfig.m; break; } case SQLITE_CONFIG_MEMSTATUS: { /* EVIDENCE-OF: R-61275-35157 The SQLITE_CONFIG_MEMSTATUS option takes ** single argument of type int, interpreted as a boolean, which enables ** or disables the collection of memory allocation statistics. */ sqlite3GlobalConfig.bMemstat = va_arg(ap, int); break; } case SQLITE_CONFIG_SCRATCH: { /* EVIDENCE-OF: R-08404-60887 There are three arguments to ** SQLITE_CONFIG_SCRATCH: A pointer an 8-byte aligned memory buffer from ** which the scratch allocations will be drawn, the size of each scratch ** allocation (sz), and the maximum number of scratch allocations (N). */ sqlite3GlobalConfig.pScratch = va_arg(ap, void*); sqlite3GlobalConfig.szScratch = va_arg(ap, int); sqlite3GlobalConfig.nScratch = va_arg(ap, int); break; } case SQLITE_CONFIG_PAGECACHE: { /* EVIDENCE-OF: R-18761-36601 There are three arguments to ** SQLITE_CONFIG_PAGECACHE: A pointer to 8-byte aligned memory (pMem), ** the size of each page cache line (sz), and the number of cache lines ** (N). */ sqlite3GlobalConfig.pPage = va_arg(ap, void*); sqlite3GlobalConfig.szPage = va_arg(ap, int); sqlite3GlobalConfig.nPage = va_arg(ap, int); break; } case SQLITE_CONFIG_PCACHE_HDRSZ: { /* EVIDENCE-OF: R-39100-27317 The SQLITE_CONFIG_PCACHE_HDRSZ option takes ** a single parameter which is a pointer to an integer and writes into ** that integer the number of extra bytes per page required for each page ** in SQLITE_CONFIG_PAGECACHE. */ *va_arg(ap, int*) = sqlite3HeaderSizeBtree() + sqlite3HeaderSizePcache() + sqlite3HeaderSizePcache1(); break; } case SQLITE_CONFIG_PCACHE: { /* no-op */ break; } case SQLITE_CONFIG_GETPCACHE: { /* now an error */ rc = SQLITE_ERROR; break; } case SQLITE_CONFIG_PCACHE2: { /* EVIDENCE-OF: R-63325-48378 The SQLITE_CONFIG_PCACHE2 option takes a ** single argument which is a pointer to an sqlite3_pcache_methods2 ** object. This object specifies the interface to a custom page cache ** implementation. */ sqlite3GlobalConfig.pcache2 = *va_arg(ap, sqlite3_pcache_methods2*); break; } case SQLITE_CONFIG_GETPCACHE2: { /* EVIDENCE-OF: R-22035-46182 The SQLITE_CONFIG_GETPCACHE2 option takes a ** single argument which is a pointer to an sqlite3_pcache_methods2 ** object. SQLite copies of the current page cache implementation into ** that object. */ if( sqlite3GlobalConfig.pcache2.xInit==0 ){ sqlite3PCacheSetDefault(); } *va_arg(ap, sqlite3_pcache_methods2*) = sqlite3GlobalConfig.pcache2; break; } /* EVIDENCE-OF: R-06626-12911 The SQLITE_CONFIG_HEAP option is only ** available if SQLite is compiled with either SQLITE_ENABLE_MEMSYS3 or ** SQLITE_ENABLE_MEMSYS5 and returns SQLITE_ERROR if invoked otherwise. */ #if defined(SQLITE_ENABLE_MEMSYS3) || defined(SQLITE_ENABLE_MEMSYS5) case SQLITE_CONFIG_HEAP: { /* EVIDENCE-OF: R-19854-42126 There are three arguments to ** SQLITE_CONFIG_HEAP: An 8-byte aligned pointer to the memory, the ** number of bytes in the memory buffer, and the minimum allocation size. */ sqlite3GlobalConfig.pHeap = va_arg(ap, void*); sqlite3GlobalConfig.nHeap = va_arg(ap, int); sqlite3GlobalConfig.mnReq = va_arg(ap, int); if( sqlite3GlobalConfig.mnReq<1 ){ sqlite3GlobalConfig.mnReq = 1; }else if( sqlite3GlobalConfig.mnReq>(1<<12) ){ /* cap min request size at 2^12 */ sqlite3GlobalConfig.mnReq = (1<<12); } if( sqlite3GlobalConfig.pHeap==0 ){ /* EVIDENCE-OF: R-49920-60189 If the first pointer (the memory pointer) ** is NULL, then SQLite reverts to using its default memory allocator ** (the system malloc() implementation), undoing any prior invocation of ** SQLITE_CONFIG_MALLOC. ** ** Setting sqlite3GlobalConfig.m to all zeros will cause malloc to ** revert to its default implementation when sqlite3_initialize() is run */ memset(&sqlite3GlobalConfig.m, 0, sizeof(sqlite3GlobalConfig.m)); }else{ /* EVIDENCE-OF: R-61006-08918 If the memory pointer is not NULL then the ** alternative memory allocator is engaged to handle all of SQLites ** memory allocation needs. */ #ifdef SQLITE_ENABLE_MEMSYS3 sqlite3GlobalConfig.m = *sqlite3MemGetMemsys3(); #endif #ifdef SQLITE_ENABLE_MEMSYS5 sqlite3GlobalConfig.m = *sqlite3MemGetMemsys5(); #endif } break; } #endif case SQLITE_CONFIG_LOOKASIDE: { sqlite3GlobalConfig.szLookaside = va_arg(ap, int); sqlite3GlobalConfig.nLookaside = va_arg(ap, int); break; } /* Record a pointer to the logger function and its first argument. ** The default is NULL. Logging is disabled if the function pointer is ** NULL. */ case SQLITE_CONFIG_LOG: { /* MSVC is picky about pulling func ptrs from va lists. ** http://support.microsoft.com/kb/47961 ** sqlite3GlobalConfig.xLog = va_arg(ap, void(*)(void*,int,const char*)); */ typedef void(*LOGFUNC_t)(void*,int,const char*); sqlite3GlobalConfig.xLog = va_arg(ap, LOGFUNC_t); sqlite3GlobalConfig.pLogArg = va_arg(ap, void*); break; } /* EVIDENCE-OF: R-55548-33817 The compile-time setting for URI filenames ** can be changed at start-time using the ** sqlite3_config(SQLITE_CONFIG_URI,1) or ** sqlite3_config(SQLITE_CONFIG_URI,0) configuration calls. */ case SQLITE_CONFIG_URI: { /* EVIDENCE-OF: R-25451-61125 The SQLITE_CONFIG_URI option takes a single ** argument of type int. If non-zero, then URI handling is globally ** enabled. If the parameter is zero, then URI handling is globally ** disabled. */ sqlite3GlobalConfig.bOpenUri = va_arg(ap, int); break; } case SQLITE_CONFIG_COVERING_INDEX_SCAN: { /* EVIDENCE-OF: R-36592-02772 The SQLITE_CONFIG_COVERING_INDEX_SCAN ** option takes a single integer argument which is interpreted as a ** boolean in order to enable or disable the use of covering indices for ** full table scans in the query optimizer. */ sqlite3GlobalConfig.bUseCis = va_arg(ap, int); break; } #ifdef SQLITE_ENABLE_SQLLOG case SQLITE_CONFIG_SQLLOG: { typedef void(*SQLLOGFUNC_t)(void*, sqlite3*, const char*, int); sqlite3GlobalConfig.xSqllog = va_arg(ap, SQLLOGFUNC_t); sqlite3GlobalConfig.pSqllogArg = va_arg(ap, void *); break; } #endif case SQLITE_CONFIG_MMAP_SIZE: { /* EVIDENCE-OF: R-58063-38258 SQLITE_CONFIG_MMAP_SIZE takes two 64-bit ** integer (sqlite3_int64) values that are the default mmap size limit ** (the default setting for PRAGMA mmap_size) and the maximum allowed ** mmap size limit. */ sqlite3_int64 szMmap = va_arg(ap, sqlite3_int64); sqlite3_int64 mxMmap = va_arg(ap, sqlite3_int64); /* EVIDENCE-OF: R-53367-43190 If either argument to this option is ** negative, then that argument is changed to its compile-time default. ** ** EVIDENCE-OF: R-34993-45031 The maximum allowed mmap size will be ** silently truncated if necessary so that it does not exceed the ** compile-time maximum mmap size set by the SQLITE_MAX_MMAP_SIZE ** compile-time option. */ if( mxMmap<0 || mxMmap>SQLITE_MAX_MMAP_SIZE ){ mxMmap = SQLITE_MAX_MMAP_SIZE; } if( szMmap<0 ) szMmap = SQLITE_DEFAULT_MMAP_SIZE; if( szMmap>mxMmap) szMmap = mxMmap; sqlite3GlobalConfig.mxMmap = mxMmap; sqlite3GlobalConfig.szMmap = szMmap; break; } #if SQLITE_OS_WIN && defined(SQLITE_WIN32_MALLOC) /* IMP: R-04780-55815 */ case SQLITE_CONFIG_WIN32_HEAPSIZE: { /* EVIDENCE-OF: R-34926-03360 SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit ** unsigned integer value that specifies the maximum size of the created ** heap. */ sqlite3GlobalConfig.nHeap = va_arg(ap, int); break; } #endif case SQLITE_CONFIG_PMASZ: { sqlite3GlobalConfig.szPma = va_arg(ap, unsigned int); break; } case SQLITE_CONFIG_STMTJRNL_SPILL: { sqlite3GlobalConfig.nStmtSpill = va_arg(ap, int); break; } default: { rc = SQLITE_ERROR; break; } } va_end(ap); return rc; } /* ** Set up the lookaside buffers for a database connection. ** Return SQLITE_OK on success. ** If lookaside is already active, return SQLITE_BUSY. ** ** The sz parameter is the number of bytes in each lookaside slot. ** The cnt parameter is the number of slots. If pStart is NULL the ** space for the lookaside memory is obtained from sqlite3_malloc(). ** If pStart is not NULL then it is sz*cnt bytes of memory to use for ** the lookaside memory. */ static int setupLookaside(sqlite3 *db, void *pBuf, int sz, int cnt){ #ifndef SQLITE_OMIT_LOOKASIDE void *pStart; if( db->lookaside.nOut ){ return SQLITE_BUSY; } /* Free any existing lookaside buffer for this handle before ** allocating a new one so we don't have to have space for ** both at the same time. */ if( db->lookaside.bMalloced ){ sqlite3_free(db->lookaside.pStart); } /* The size of a lookaside slot after ROUNDDOWN8 needs to be larger ** than a pointer to be useful. */ sz = ROUNDDOWN8(sz); /* IMP: R-33038-09382 */ if( sz<=(int)sizeof(LookasideSlot*) ) sz = 0; if( cnt<0 ) cnt = 0; if( sz==0 || cnt==0 ){ sz = 0; pStart = 0; }else if( pBuf==0 ){ sqlite3BeginBenignMalloc(); pStart = sqlite3Malloc( sz*cnt ); /* IMP: R-61949-35727 */ sqlite3EndBenignMalloc(); if( pStart ) cnt = sqlite3MallocSize(pStart)/sz; }else{ pStart = pBuf; } db->lookaside.pStart = pStart; db->lookaside.pFree = 0; db->lookaside.sz = (u16)sz; if( pStart ){ int i; LookasideSlot *p; assert( sz > (int)sizeof(LookasideSlot*) ); p = (LookasideSlot*)pStart; for(i=cnt-1; i>=0; i--){ p->pNext = db->lookaside.pFree; db->lookaside.pFree = p; p = (LookasideSlot*)&((u8*)p)[sz]; } db->lookaside.pEnd = p; db->lookaside.bDisable = 0; db->lookaside.bMalloced = pBuf==0 ?1:0; }else{ db->lookaside.pStart = db; db->lookaside.pEnd = db; db->lookaside.bDisable = 1; db->lookaside.bMalloced = 0; } #endif /* SQLITE_OMIT_LOOKASIDE */ return SQLITE_OK; } /* ** Return the mutex associated with a database connection. */ sqlite3_mutex *sqlite3_db_mutex(sqlite3 *db){ #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ){ (void)SQLITE_MISUSE_BKPT; return 0; } #endif return db->mutex; } /* ** Free up as much memory as we can from the given database ** connection. */ int sqlite3_db_release_memory(sqlite3 *db){ int i; #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; #endif sqlite3_mutex_enter(db->mutex); sqlite3BtreeEnterAll(db); for(i=0; i<db->nDb; i++){ Btree *pBt = db->aDb[i].pBt; if( pBt ){ Pager *pPager = sqlite3BtreePager(pBt); sqlite3PagerShrink(pPager); } } sqlite3BtreeLeaveAll(db); sqlite3_mutex_leave(db->mutex); return SQLITE_OK; } /* ** Flush any dirty pages in the pager-cache for any attached database ** to disk. */ int sqlite3_db_cacheflush(sqlite3 *db){ int i; int rc = SQLITE_OK; int bSeenBusy = 0; #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ) return SQLITE_MISUSE_BKPT; #endif sqlite3_mutex_enter(db->mutex); sqlite3BtreeEnterAll(db); for(i=0; rc==SQLITE_OK && i<db->nDb; i++){ Btree *pBt = db->aDb[i].pBt; if( pBt && sqlite3BtreeIsInTrans(pBt) ){ Pager *pPager = sqlite3BtreePager(pBt); rc = sqlite3PagerFlush(pPager); if( rc==SQLITE_BUSY ){ bSeenBusy = 1; rc = SQLITE_OK; } } } sqlite3BtreeLeaveAll(db); sqlite3_mutex_leave(db->mutex); return ((rc==SQLITE_OK && bSeenBusy) ? SQLITE_BUSY : rc); } /* ** Configuration settings for an individual database connection */ int sqlite3_db_config(sqlite3 *db, int op, ...){ va_list ap; int rc; va_start(ap, op); switch( op ){ case SQLITE_DBCONFIG_MAINDBNAME: { /* IMP: R-06824-28531 */ /* IMP: R-36257-52125 */ db->aDb[0].zDbSName = va_arg(ap,char*); rc = SQLITE_OK; break; } case SQLITE_DBCONFIG_LOOKASIDE: { void *pBuf = va_arg(ap, void*); /* IMP: R-26835-10964 */ int sz = va_arg(ap, int); /* IMP: R-47871-25994 */ int cnt = va_arg(ap, int); /* IMP: R-04460-53386 */ rc = setupLookaside(db, pBuf, sz, cnt); break; } default: { static const struct { int op; /* The opcode */ u32 mask; /* Mask of the bit in sqlite3.flags to set/clear */ } aFlagOp[] = { { SQLITE_DBCONFIG_ENABLE_FKEY, SQLITE_ForeignKeys }, { SQLITE_DBCONFIG_ENABLE_TRIGGER, SQLITE_EnableTrigger }, { SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER, SQLITE_Fts3Tokenizer }, { SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION, SQLITE_LoadExtension }, { SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE, SQLITE_NoCkptOnClose }, { SQLITE_DBCONFIG_ENABLE_QPSG, SQLITE_EnableQPSG }, }; unsigned int i; rc = SQLITE_ERROR; /* IMP: R-42790-23372 */ for(i=0; i<ArraySize(aFlagOp); i++){ if( aFlagOp[i].op==op ){ int onoff = va_arg(ap, int); int *pRes = va_arg(ap, int*); int oldFlags = db->flags; if( onoff>0 ){ db->flags |= aFlagOp[i].mask; }else if( onoff==0 ){ db->flags &= ~aFlagOp[i].mask; } if( oldFlags!=db->flags ){ sqlite3ExpirePreparedStatements(db); } if( pRes ){ *pRes = (db->flags & aFlagOp[i].mask)!=0; } rc = SQLITE_OK; break; } } break; } } va_end(ap); return rc; } /* ** Return true if the buffer z[0..n-1] contains all spaces. */ static int allSpaces(const char *z, int n){ while( n>0 && z[n-1]==' ' ){ n--; } return n==0; } /* ** This is the default collating function named "BINARY" which is always ** available. ** ** If the padFlag argument is not NULL then space padding at the end ** of strings is ignored. This implements the RTRIM collation. */ static int binCollFunc( void *padFlag, int nKey1, const void *pKey1, int nKey2, const void *pKey2 ){ int rc, n; n = nKey1<nKey2 ? nKey1 : nKey2; /* EVIDENCE-OF: R-65033-28449 The built-in BINARY collation compares ** strings byte by byte using the memcmp() function from the standard C ** library. */ assert( pKey1 && pKey2 ); rc = memcmp(pKey1, pKey2, n); if( rc==0 ){ if( padFlag && allSpaces(((char*)pKey1)+n, nKey1-n) && allSpaces(((char*)pKey2)+n, nKey2-n) ){ /* EVIDENCE-OF: R-31624-24737 RTRIM is like BINARY except that extra ** spaces at the end of either string do not change the result. In other ** words, strings will compare equal to one another as long as they ** differ only in the number of spaces at the end. */ }else{ rc = nKey1 - nKey2; } } return rc; } /* ** Another built-in collating sequence: NOCASE. ** ** This collating sequence is intended to be used for "case independent ** comparison". SQLite's knowledge of upper and lower case equivalents ** extends only to the 26 characters used in the English language. ** ** At the moment there is only a UTF-8 implementation. */ static int nocaseCollatingFunc( void *NotUsed, int nKey1, const void *pKey1, int nKey2, const void *pKey2 ){ int r = sqlite3StrNICmp( (const char *)pKey1, (const char *)pKey2, (nKey1<nKey2)?nKey1:nKey2); UNUSED_PARAMETER(NotUsed); if( 0==r ){ r = nKey1-nKey2; } return r; } /* ** Return the ROWID of the most recent insert */ sqlite_int64 sqlite3_last_insert_rowid(sqlite3 *db){ #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ){ (void)SQLITE_MISUSE_BKPT; return 0; } #endif return db->lastRowid; } /* ** Set the value returned by the sqlite3_last_insert_rowid() API function. */ void sqlite3_set_last_insert_rowid(sqlite3 *db, sqlite3_int64 iRowid){ #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ){ (void)SQLITE_MISUSE_BKPT; return; } #endif sqlite3_mutex_enter(db->mutex); db->lastRowid = iRowid; sqlite3_mutex_leave(db->mutex); } /* ** Return the number of changes in the most recent call to sqlite3_exec(). */ int sqlite3_changes(sqlite3 *db){ #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ){ (void)SQLITE_MISUSE_BKPT; return 0; } #endif return db->nChange; } /* ** Return the number of changes since the database handle was opened. */ int sqlite3_total_changes(sqlite3 *db){ #ifdef SQLITE_ENABLE_API_ARMOR if( !sqlite3SafetyCheckOk(db) ){ (void)SQLITE_MISUSE_BKPT; return 0; } #endif return db->nTotalChange; } /* ** Close all open savepoints. This function only manipulates fields of the ** database handle object, it does not close any savepoints that may be open ** at the b-tree/pager level. */ void sqlite3CloseSavepoints(sqlite3 *db){ while( db->pSavepoint ){ Savepoint *pTmp = db->pSavepoint; db->pSavepoint = pTmp->pNext; sqlite3DbFree(db, pTmp); } db->nSavepoint = 0; db->nStatement = 0; db->isTransactionSavepoint = 0; } /* ** Invoke the destructor function associated with FuncDef p, if any. Except, ** if this is not the last copy of the function, do not invoke it. Multiple ** copies of a single function are created when create_function() is called ** with SQLITE_ANY as the encoding. */ static void functionDestroy(sqlite3 *db, FuncDef *p){ FuncDestructor *pDestructor = p->u.pDestructor; if( pDestructor ){ pDestructor->nRef--; if( pDestructor->nRef==0 ){ pDestructor->xDestroy(pDestructor->pUserData); sqlite3DbFree(db, pDestructor); |
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