/*
** The first parameter (pDef) is a function implementation. The
** second parameter (pExpr) is the first argument to this function.
** If pExpr is a column in a virtual table, then let the virtual
** table implementation have an opportunity to overload the function.
**
** This routine is used to allow virtual table implementations to
** overload MATCH, LIKE, GLOB, and REGEXP operators.
**
** Return either the pDef argument (indicating no change) or a
** new FuncDef structure that is marked as ephemeral using the
** SQLITE_FUNC_EPHEM flag.
*/
FuncDef *sqlite3VtabOverloadFunction(
sqlite3 *db, /* Database connection for reporting malloc problems */
FuncDef *pDef, /* Function to possibly overload */
int nArg, /* Number of arguments to the function */
Expr *pExpr /* First argument to the function */
){
Table *pTab;
sqlite3_vtab *pVtab;
sqlite3_module *pMod;
void (*xSFunc)(sqlite3_context*,int,sqlite3_value**) = 0;
void *pArg = 0;
FuncDef *pNew;
int rc = 0;
char *zLowerName;
unsigned char *z;
/* Check to see the left operand is a column in a virtual table */
if( NEVER(pExpr==0) ) return pDef;
if( pExpr->op!=TK_COLUMN ) return pDef;
pTab = pExpr->pTab;
if( NEVER(pTab==0) ) return pDef;
if( (pTab->tabFlags & TF_Virtual)==0 ) return pDef;
pVtab = sqlite3GetVTable(db, pTab)->pVtab;
assert( pVtab!=0 );
assert( pVtab->pModule!=0 );
pMod = (sqlite3_module *)pVtab->pModule;
if( pMod->xFindFunction==0 ) return pDef;
/* Call the xFindFunction method on the virtual table implementation
** to see if the implementation wants to overload this function
*/
zLowerName = sqlite3DbStrDup(db, pDef->zName);
if( zLowerName ){
for(z=(unsigned char*)zLowerName; *z; z++){
*z = sqlite3UpperToLower[*z];
}
rc = pMod->xFindFunction(pVtab, nArg, zLowerName, &xSFunc, &pArg);
sqlite3DbFree(db, zLowerName);
}
if( rc==0 ){
return pDef;
}
/* Create a new ephemeral function definition for the overloaded
** function */
pNew = sqlite3DbMallocZero(db, sizeof(*pNew)
+ sqlite3Strlen30(pDef->zName) + 1);
if( pNew==0 ){
return pDef;
}
*pNew = *pDef;
pNew->zName = (const char*)&pNew[1];
memcpy((char*)&pNew[1], pDef->zName, sqlite3Strlen30(pDef->zName)+1);
pNew->xSFunc = xSFunc;
pNew->pUserData = pArg;
pNew->funcFlags |= SQLITE_FUNC_EPHEM;
return pNew;
}
/*
** Create a temporary file name in zBuf. zBuf must be big enough to
** hold at pVfs->mxPathname characters.
*/
static int getTempname(int nBuf, char *zBuf ){
static const unsigned char zChars[] =
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789";
int i, j;
char zTempPathBuf[3];
PSZ zTempPath = (PSZ)&zTempPathBuf;
if( sqlite3_temp_directory ){
zTempPath = sqlite3_temp_directory;
}else{
if( DosScanEnv( (PSZ)"TEMP", &zTempPath ) ){
if( DosScanEnv( (PSZ)"TMP", &zTempPath ) ){
if( DosScanEnv( (PSZ)"TMPDIR", &zTempPath ) ){
ULONG ulDriveNum = 0, ulDriveMap = 0;
DosQueryCurrentDisk( &ulDriveNum, &ulDriveMap );
sprintf( (char*)zTempPath, "%c:", (char)( 'A' + ulDriveNum - 1 ) );
}
}
}
}
/* Strip off a trailing slashes or backslashes, otherwise we would get *
* multiple (back)slashes which causes DosOpen() to fail. *
* Trailing spaces are not allowed, either. */
j = sqlite3Strlen30(zTempPath);
while( j > 0 && ( zTempPath[j-1] == '\\' || zTempPath[j-1] == '/'
|| zTempPath[j-1] == ' ' ) ){
j--;
}
zTempPath[j] = '\0';
if( !sqlite3_temp_directory ){
char *zTempPathUTF = convertCpPathToUtf8( zTempPath );
sqlite3_snprintf( nBuf-30, zBuf,
"%s\\"SQLITE_TEMP_FILE_PREFIX, zTempPathUTF );
free( zTempPathUTF );
}else{
sqlite3_snprintf( nBuf-30, zBuf,
"%s\\"SQLITE_TEMP_FILE_PREFIX, zTempPath );
}
j = sqlite3Strlen30( zBuf );
sqlite3_randomness( 20, &zBuf[j] );
for( i = 0; i < 20; i++, j++ ){
zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
}
zBuf[j] = 0;
OSTRACE2( "TEMP FILENAME: %s\n", zBuf );
return SQLITE_OK;
}
/*
** Evaluate a view and store its result in an ephemeral table. The
** pWhere argument is an optional WHERE clause that restricts the
** set of rows in the view that are to be added to the ephemeral table.
*/
void sqlite3MaterializeView(
Parse *pParse, /* Parsing context */
Table *pView, /* View definition */
Expr *pWhere, /* Optional WHERE clause to be added */
int iCur /* Cursor number for ephemerial table */
){
SelectDest dest;
Select *pDup;
sqlite3 *db = pParse->db;
pDup = sqlite3SelectDup(db, pView->pSelect);
if( pWhere ){
SrcList *pFrom;
Token viewName;
pWhere = sqlite3ExprDup(db, pWhere);
viewName.z = (u8*)pView->zName;
viewName.n = (unsigned int)sqlite3Strlen30((const char*)viewName.z);
pFrom = sqlite3SrcListAppendFromTerm(pParse, 0, 0, 0, &viewName, pDup, 0,0);
pDup = sqlite3SelectNew(pParse, 0, pFrom, pWhere, 0, 0, 0, 0, 0, 0);
}
sqlite3SelectDestInit(&dest, SRT_EphemTab, iCur);
sqlite3Select(pParse, pDup, &dest);
sqlite3SelectDelete(db, pDup);
}
static void roundFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
int n = 0;
double r;
char *zBuf;
assert( argc==1 || argc==2 );
if( argc==2 ){
if( SQLITE_NULL==sqlite3_value_type(argv[1]) ) return;
n = sqlite3_value_int(argv[1]);
if( n>30 ) n = 30;
if( n<0 ) n = 0;
}
if( sqlite3_value_type(argv[0])==SQLITE_NULL ) return;
r = sqlite3_value_double(argv[0]);
/* If Y==0 and X will fit in a 64-bit int,
** handle the rounding directly,
** otherwise use printf.
*/
if( n==0 && r>=0 && r<LARGEST_INT64-1 ){
r = (double)((sqlite_int64)(r+0.5));
}else if( n==0 && r<0 && (-r)<LARGEST_INT64-1 ){
r = -(double)((sqlite_int64)((-r)+0.5));
}else{
zBuf = sqlite3_mprintf("%.*f",n,r);
if( zBuf==0 ){
sqlite3_result_error_nomem(context);
return;
}
sqlite3AtoF(zBuf, &r, sqlite3Strlen30(zBuf), SQLITE_UTF8);
sqlite3_free(zBuf);
}
sqlite3_result_double(context, r);
}
/*
** This function is invoked by the vdbe to call the xCreate method
** of the virtual table named zTab in database iDb.
**
** If an error occurs, *pzErr is set to point an an English language
** description of the error and an SQLITE_XXX error code is returned.
** In this case the caller must call sqlite3DbFree(db, ) on *pzErr.
*/
int sqlite3VtabCallCreate(sqlite3 *db, int iDb, const char *zTab, char **pzErr){
int rc = SQLITE_OK;
Table *pTab;
Module *pMod;
const char *zMod;
pTab = sqlite3FindTable(db, zTab, db->aDb[iDb].zName);
assert( pTab && (pTab->tabFlags & TF_Virtual)!=0 && !pTab->pVTable );
/* Locate the required virtual table module */
zMod = pTab->azModuleArg[0];
pMod = (Module*)sqlite3HashFind(&db->aModule, zMod, sqlite3Strlen30(zMod));
/* If the module has been registered and includes a Create method,
** invoke it now. If the module has not been registered, return an
** error. Otherwise, do nothing.
*/
if( !pMod ){
*pzErr = sqlite3MPrintf(db, "no such module: %s", zMod);
rc = SQLITE_ERROR;
}else{
rc = vtabCallConstructor(db, pTab, pMod, pMod->pModule->xCreate, pzErr);
}
/* Justification of ALWAYS(): The xConstructor method is required to
** create a valid sqlite3_vtab if it returns SQLITE_OK. */
if( rc==SQLITE_OK && ALWAYS(sqlite3GetVTable(db, pTab)) ){
rc = addToVTrans(db, sqlite3GetVTable(db, pTab));
}
return rc;
}
/*
** This function is invoked by the parser to call the xConnect() method
** of the virtual table pTab. If an error occurs, an error code is returned
** and an error left in pParse.
**
** This call is a no-op if table pTab is not a virtual table.
*/
int sqlite3VtabCallConnect(Parse *pParse, Table *pTab){
sqlite3 *db = pParse->db;
const char *zMod;
Module *pMod;
int rc;
assert( pTab );
if( (pTab->tabFlags & TF_Virtual)==0 || sqlite3GetVTable(db, pTab) ){
return SQLITE_OK;
}
/* Locate the required virtual table module */
zMod = pTab->azModuleArg[0];
pMod = (Module*)sqlite3HashFind(&db->aModule, zMod, sqlite3Strlen30(zMod));
if( !pMod ){
const char *zModule = pTab->azModuleArg[0];
sqlite3ErrorMsg(pParse, "no such module: %s", zModule);
rc = SQLITE_ERROR;
}else{
char *zErr = 0;
rc = vtabCallConstructor(db, pTab, pMod, pMod->pModule->xConnect, &zErr);
if( rc!=SQLITE_OK ){
sqlite3ErrorMsg(pParse, "%s", zErr);
}
sqlite3DbFree(db, zErr);
}
return rc;
}
/*
** Add MEM_Str to the set of representations for the given Mem. Numbers
** are converted using sqlite3_snprintf(). Converting a BLOB to a string
** is a no-op.
**
** Existing representations MEM_Int and MEM_Real are *not* invalidated.
**
** A MEM_Null value will never be passed to this function. This function is
** used for converting values to text for returning to the user (i.e. via
** sqlite3_value_text()), or for ensuring that values to be used as btree
** keys are strings. In the former case a NULL pointer is returned the
** user and the later is an internal programming error.
*/
int sqlite3VdbeMemStringify(Mem *pMem, int enc){
int rc = SQLITE_OK;
int fg = pMem->flags;
const int nByte = 32;
assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
assert( !(fg&MEM_Zero) );
assert( !(fg&(MEM_Str|MEM_Blob)) );
assert( fg&(MEM_Int|MEM_Real) );
assert( (pMem->flags&MEM_RowSet)==0 );
assert( EIGHT_BYTE_ALIGNMENT(pMem) );
if( sqlite3VdbeMemGrow(pMem, nByte, 0) ){
return SQLITE_NOMEM;
}
/* For a Real or Integer, use sqlite3_mprintf() to produce the UTF-8
** string representation of the value. Then, if the required encoding
** is UTF-16le or UTF-16be do a translation.
**
** FIX ME: It would be better if sqlite3_snprintf() could do UTF-16.
*/
if( fg & MEM_Int ){
sqlite3_snprintf(nByte, pMem->z, "%lld", pMem->u.i);
}else{
assert( fg & MEM_Real );
sqlite3_snprintf(nByte, pMem->z, "%!.15g", pMem->r);
}
pMem->n = sqlite3Strlen30(pMem->z);
pMem->enc = SQLITE_UTF8;
pMem->flags |= MEM_Str|MEM_Term;
sqlite3VdbeChangeEncoding(pMem, enc);
return rc;
}
/*
** Parameter zName is the name of a table that is about to be altered
** (either with ALTER TABLE ... RENAME TO or ALTER TABLE ... ADD COLUMN).
** If the table is a system table, this function leaves an error message
** in pParse->zErr (system tables may not be altered) and returns non-zero.
**
** Or, if zName is not a system table, zero is returned.
*/
static int isSystemTable(Parse *pParse, const char *zName){
if( sqlite3Strlen30(zName)>6 && 0==sqlite3StrNICmp(zName, "sqlite_", 7) ){
sqlite3ErrorMsg(pParse, "table %s may not be altered", zName);
return 1;
}
return 0;
}
/*
** Check to see if virtual tale module pMod can be have an eponymous
** virtual table instance. If it can, create one if one does not already
** exist. Return non-zero if the eponymous virtual table instance exists
** when this routine returns, and return zero if it does not exist.
**
** An eponymous virtual table instance is one that is named after its
** module, and more importantly, does not require a CREATE VIRTUAL TABLE
** statement in order to come into existance. Eponymous virtual table
** instances always exist. They cannot be DROP-ed.
**
** Any virtual table module for which xConnect and xCreate are the same
** method can have an eponymous virtual table instance.
*/
int sqlite3VtabEponymousTableInit(Parse *pParse, Module *pMod){
const sqlite3_module *pModule = pMod->pModule;
Table *pTab;
char *zErr = 0;
int nName;
int rc;
sqlite3 *db = pParse->db;
if( pMod->pEpoTab ) return 1;
if( pModule->xCreate!=0 && pModule->xCreate!=pModule->xConnect ) return 0;
nName = sqlite3Strlen30(pMod->zName) + 1;
pTab = sqlite3DbMallocZero(db, sizeof(Table) + nName);
if( pTab==0 ) return 0;
pMod->pEpoTab = pTab;
pTab->zName = (char*)&pTab[1];
memcpy(pTab->zName, pMod->zName, nName);
pTab->nRef = 1;
pTab->pSchema = db->aDb[0].pSchema;
pTab->tabFlags |= TF_Virtual;
pTab->nModuleArg = 0;
pTab->iPKey = -1;
addModuleArgument(db, pTab, sqlite3DbStrDup(db, pTab->zName));
addModuleArgument(db, pTab, 0);
addModuleArgument(db, pTab, sqlite3DbStrDup(db, pTab->zName));
rc = vtabCallConstructor(db, pTab, pMod, pModule->xConnect, &zErr);
if( rc ){
sqlite3ErrorMsg(pParse, "%s", zErr);
sqlite3DbFree(db, zErr);
sqlite3VtabEponymousTableClear(db, pMod);
return 0;
}
return 1;
}
/*
** This function is called to drop a trigger from the database schema.
**
** This may be called directly from the parser and therefore identifies
** the trigger by name. The sqlite3DropTriggerPtr() routine does the
** same job as this routine except it takes a pointer to the trigger
** instead of the trigger name.
**/
void sqlite3DropTrigger(Parse *pParse, SrcList *pName, int noErr){
Trigger *pTrigger = 0;
int i;
const char *zDb;
const char *zName;
int nName;
sqlite3 *db = pParse->db;
if( db->mallocFailed ) goto drop_trigger_cleanup;
if( SQLITE_OK!=sqlite3ReadSchema(pParse) ){
goto drop_trigger_cleanup;
}
assert( pName->nSrc==1 );
zDb = pName->a[0].zDatabase;
zName = pName->a[0].zName;
nName = sqlite3Strlen30(zName);
for(i=OMIT_TEMPDB; i<db->nDb; i++){
int j = (i<2) ? i^1 : i; /* Search TEMP before MAIN */
if( zDb && sqlite3StrICmp(db->aDb[j].zName, zDb) ) continue;
pTrigger = sqlite3HashFind(&(db->aDb[j].pSchema->trigHash), zName, nName);
if( pTrigger ) break;
}
if( !pTrigger ){
if( !noErr ){
sqlite3ErrorMsg(pParse, "no such trigger: %S", pName, 0);
}
goto drop_trigger_cleanup;
}
sqlite3DropTriggerPtr(pParse, pTrigger);
drop_trigger_cleanup:
sqlite3SrcListDelete(db, pName);
}
/*
** Construct and install a Module object for a virtual table. When this
** routine is called, it is guaranteed that all appropriate locks are held
** and the module is not already part of the connection.
*/
Module *sqlite3VtabCreateModule(
sqlite3 *db, /* Database in which module is registered */
const char *zName, /* Name assigned to this module */
const sqlite3_module *pModule, /* The definition of the module */
void *pAux, /* Context pointer for xCreate/xConnect */
void (*xDestroy)(void *) /* Module destructor function */
){
Module *pMod;
int nName = sqlite3Strlen30(zName);
pMod = (Module *)sqlite3DbMallocRawNN(db, sizeof(Module) + nName + 1);
if( pMod ){
Module *pDel;
char *zCopy = (char *)(&pMod[1]);
memcpy(zCopy, zName, nName+1);
pMod->zName = zCopy;
pMod->pModule = pModule;
pMod->pAux = pAux;
pMod->xDestroy = xDestroy;
pMod->pEpoTab = 0;
pDel = (Module *)sqlite3HashInsert(&db->aModule,zCopy,(void*)pMod);
assert( pDel==0 || pDel==pMod );
if( pDel ){
sqlite3OomFault(db);
sqlite3DbFree(db, pDel);
pMod = 0;
}
}
return pMod;
}
/*
** pExpr points to an expression which implements a function. If
** it is appropriate to apply the LIKE optimization to that function
** then set aWc[0] through aWc[2] to the wildcard characters and
** return TRUE. If the function is not a LIKE-style function then
** return FALSE.
*/
int sqlite3IsLikeFunction(sqlite3 *db, Expr *pExpr, int *pIsNocase, char *aWc){
FuncDef *pDef;
if( pExpr->op!=TK_FUNCTION
|| !pExpr->x.pList
|| pExpr->x.pList->nExpr!=2
){
return 0;
}
assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
pDef = sqlite3FindFunction(db, pExpr->u.zToken,
sqlite3Strlen30(pExpr->u.zToken),
2, SQLITE_UTF8, 0);
if( NEVER(pDef==0) || (pDef->flags & SQLITE_FUNC_LIKE)==0 ){
return 0;
}
/* The memcpy() statement assumes that the wildcard characters are
** the first three statements in the compareInfo structure. The
** asserts() that follow verify that assumption
*/
memcpy(aWc, pDef->pUserData, 3);
assert( (char*)&likeInfoAlt == (char*)&likeInfoAlt.matchAll );
assert( &((char*)&likeInfoAlt)[1] == (char*)&likeInfoAlt.matchOne );
assert( &((char*)&likeInfoAlt)[2] == (char*)&likeInfoAlt.matchSet );
*pIsNocase = (pDef->flags & SQLITE_FUNC_CASE)==0;
return 1;
}
/*
** Remove a trigger from the hash tables of the sqlite* pointer.
*/
void sqlite3UnlinkAndDeleteTrigger(sqlite3 *db, int iDb, const char *zName){
Trigger *pTrigger;
int nName = sqlite3Strlen30(zName);
pTrigger = sqlite3HashInsert(&(db->aDb[iDb].pSchema->trigHash),
zName, nName, 0);
if( pTrigger ){
Table *pTable = tableOfTrigger(pTrigger);
assert( pTable!=0 );
if( pTable->pTrigger == pTrigger ){
pTable->pTrigger = pTrigger->pNext;
}else{
Trigger *cc = pTable->pTrigger;
while( cc ){
if( cc->pNext == pTrigger ){
cc->pNext = cc->pNext->pNext;
break;
}
cc = cc->pNext;
}
assert(cc);
}
sqlite3DeleteTrigger(db, pTrigger);
db->flags |= SQLITE_InternChanges;
}
}
/*
** Expression p should encode a floating point value between 1.0 and 0.0.
** Return 1024 times this value. Or return -1 if p is not a floating point
** value between 1.0 and 0.0.
*/
static int exprProbability(Expr *p){
double r = -1.0;
if( p->op!=TK_FLOAT ) return -1;
sqlite3AtoF(p->u.zToken, &r, sqlite3Strlen30(p->u.zToken), SQLITE_UTF8);
assert( r>=0.0 );
if( r>1.0 ) return -1;
return (int)(r*1000.0);
}
/*
** Set the LIKEOPT flag on the 2-argument function with the given name.
*/
static void setLikeOptFlag(sqlite3 *db, const char *zName, u8 flagVal){
FuncDef *pDef;
pDef = sqlite3FindFunction(db, zName, sqlite3Strlen30(zName),
2, SQLITE_UTF8, 0);
if( ALWAYS(pDef) ){
pDef->flags = flagVal;
}
}
/*
** Hash and comparison functions when the mode is SQLITE_HASH_STRING
*/
static int strHash(const void *pKey, int nKey){
const char *z = (const char *)pKey;
int h = 0;
if( nKey<=0 ) nKey = sqlite3Strlen30(z);
while( nKey > 0 ){
h = (h<<3) ^ h ^ sqlite3UpperToLower[(unsigned char)*z++];
nKey--;
}
return h & 0x7fffffff;
}
/*
** Given the name of a compile-time option, return true if that option
** was used and false if not.
**
** The name can optionally begin with "SQLITE_" but the "SQLITE_" prefix
** is not required for a match.
*/
int sqlite3_compileoption_used(const char *zOptName){
int i, n;
if( sqlite3StrNICmp(zOptName, "SQLITE_", 7)==0 ) zOptName += 7;
n = sqlite3Strlen30(zOptName);
/* Since ArraySize(azCompileOpt) is normally in single digits, a
** linear search is adequate. No need for a binary search. */
for(i=0; i<ArraySize(azCompileOpt); i++){
if( (sqlite3StrNICmp(zOptName, azCompileOpt[i], n)==0)
&& ( (azCompileOpt[i][n]==0) || (azCompileOpt[i][n]=='=') ) ) return 1;
}
return 0;
}
/*
** Make a copy of a string in memory obtained from sqliteMalloc(). These
** functions call sqlite3MallocRaw() directly instead of sqliteMalloc(). This
** is because when memory debugging is turned on, these two functions are
** called via macros that record the current file and line number in the
** ThreadData structure.
*/
char *sqlite3DbStrDup(sqlite3 *db, const char *z){
char *zNew;
size_t n;
if( z==0 ){
return 0;
}
n = sqlite3Strlen30(z) + 1;
assert( (n&0x7fffffff)==n );
zNew = sqlite3DbMallocRaw(db, (int)n);
if( zNew ){
memcpy(zNew, z, n);
}
return zNew;
}
/*
** Remove a trigger from the hash tables of the sqlite* pointer.
*/
void sqlite3UnlinkAndDeleteTrigger(sqlite3 *db, int iDb, const char *zName){
Hash *pHash = &(db->aDb[iDb].pSchema->trigHash);
Trigger *pTrigger;
pTrigger = sqlite3HashInsert(pHash, zName, sqlite3Strlen30(zName), 0);
if( ALWAYS(pTrigger) ){
if( pTrigger->pSchema==pTrigger->pTabSchema ){
Table *pTab = tableOfTrigger(pTrigger);
Trigger **pp;
for(pp=&pTab->pTrigger; *pp!=pTrigger; pp=&((*pp)->pNext));
*pp = (*pp)->pNext;
}
sqlite3DeleteTrigger(db, pTrigger);
db->flags |= SQLITE_InternChanges;
}
}
/*
** This routine is called if the collation factory fails to deliver a
** collation function in the best encoding but there may be other versions
** of this collation function (for other text encodings) available. Use one
** of these instead if they exist. Avoid a UTF-8 <-> UTF-16 conversion if
** possible.
*/
static int synthCollSeq(sqlite3 *db, CollSeq *pColl){
CollSeq *pColl2;
char *z = pColl->zName;
int n = sqlite3Strlen30(z);
int i;
static const u8 aEnc[] = { SQLITE_UTF16BE, SQLITE_UTF16LE, SQLITE_UTF8 };
for(i=0; i<3; i++){
pColl2 = sqlite3FindCollSeq(db, aEnc[i], z, n, 0);
if( pColl2->xCmp!=0 ){
memcpy(pColl, pColl2, sizeof(CollSeq));
pColl->xDel = 0; /* Do not copy the destructor */
return SQLITE_OK;
}
}
return SQLITE_ERROR;
}
/*
** Insert a new FuncDef into a FuncDefHash hash table.
*/
void sqlite3FuncDefInsert(
FuncDefHash *pHash, /* The hash table into which to insert */
FuncDef *pDef /* The function definition to insert */
){
FuncDef *pOther;
int nName = sqlite3Strlen30(pDef->zName);
u8 c1 = (u8)pDef->zName[0];
int h = (sqlite3UpperToLower[c1] + nName) % ArraySize(pHash->a);
pOther = functionSearch(pHash, h, pDef->zName, nName);
if( pOther ){
pDef->pNext = pOther->pNext;
pOther->pNext = pDef;
}else{
pDef->pNext = 0;
pDef->pHash = pHash->a[h];
pHash->a[h] = pDef;
}
}
/*
** Attempt to parse the given string into a julian day number. Return
** the number of errors.
**
** The following are acceptable forms for the input string:
**
** YYYY-MM-DD HH:MM:SS.FFF +/-HH:MM
** DDDD.DD
** now
**
** In the first form, the +/-HH:MM is always optional. The fractional
** seconds extension (the ".FFF") is optional. The seconds portion
** (":SS.FFF") is option. The year and date can be omitted as long
** as there is a time string. The time string can be omitted as long
** as there is a year and date.
*/
static int parseDateOrTime(
sqlite3_context *context,
const char *zDate,
DateTime *p
){
double r;
if( parseYyyyMmDd(zDate,p)==0 ){
return 0;
}else if( parseHhMmSs(zDate, p)==0 ){
return 0;
}else if( sqlite3StrICmp(zDate,"now")==0){
return setDateTimeToCurrent(context, p);
}else if( sqlite3AtoF(zDate, &r, sqlite3Strlen30(zDate), SQLITE_UTF8) ){
p->iJD = (sqlite3_int64)(r*86400000.0 + 0.5);
p->validJD = 1;
return 0;
}
return 1;
}
/*
** Convert the pStep->target token into a SrcList and return a pointer
** to that SrcList.
**
** This routine adds a specific database name, if needed, to the target when
** forming the SrcList. This prevents a trigger in one database from
** referring to a target in another database. An exception is when the
** trigger is in TEMP in which case it can refer to any other database it
** wants.
*/
static SrcList *targetSrcList(
Parse *pParse, /* The parsing context */
TriggerStep *pStep /* The trigger containing the target token */
){
Token sDb; /* Dummy database name token */
int iDb; /* Index of the database to use */
SrcList *pSrc; /* SrcList to be returned */
iDb = sqlite3SchemaToIndex(pParse->db, pStep->pTrig->pSchema);
if( iDb==0 || iDb>=2 ){
assert( iDb<pParse->db->nDb );
sDb.z = (u8*)pParse->db->aDb[iDb].zName;
sDb.n = sqlite3Strlen30((char*)sDb.z);
pSrc = sqlite3SrcListAppend(pParse->db, 0, &sDb, &pStep->target);
} else {
pSrc = sqlite3SrcListAppend(pParse->db, 0, &pStep->target, 0);
}
return pSrc;
}
/*
** Transform a UTF-8 integer literal, in either decimal or hexadecimal,
** into a 64-bit signed integer. This routine accepts hexadecimal literals,
** whereas sqlite3Atoi64() does not.
**
** Returns:
**
** 0 Successful transformation. Fits in a 64-bit signed integer.
** 1 Integer too large for a 64-bit signed integer or is malformed
** 2 Special case of 9223372036854775808
*/
int sqlite3DecOrHexToI64(const char *z, i64 *pOut){
#ifndef SQLITE_OMIT_HEX_INTEGER
if( z[0]=='0'
&& (z[1]=='x' || z[1]=='X')
&& sqlite3Isxdigit(z[2])
){
u64 u = 0;
int i, k;
for(i=2; z[i]=='0'; i++){}
for(k=i; sqlite3Isxdigit(z[k]); k++){
u = u*16 + sqlite3HexToInt(z[k]);
}
memcpy(pOut, &u, 8);
return (z[k]==0 && k-i<=16) ? 0 : 1;
}else
#endif /* SQLITE_OMIT_HEX_INTEGER */
{
return sqlite3Atoi64(z, pOut, sqlite3Strlen30(z), SQLITE_UTF8);
}
}
/*
** The actual function that does the work of creating a new module.
** This function implements the sqlite3_create_module() and
** sqlite3_create_module_v2() interfaces.
*/
static int createModule(
sqlite3 *db, /* Database in which module is registered */
const char *zName, /* Name assigned to this module */
const sqlite3_module *pModule, /* The definition of the module */
void *pAux, /* Context pointer for xCreate/xConnect */
void (*xDestroy)(void *) /* Module destructor function */
){
int rc = SQLITE_OK;
int nName;
sqlite3_mutex_enter(db->mutex);
nName = sqlite3Strlen30(zName);
if( sqlite3HashFind(&db->aModule, zName) ){
rc = SQLITE_MISUSE_BKPT;
}else{
Module *pMod;
pMod = (Module *)sqlite3DbMallocRaw(db, sizeof(Module) + nName + 1);
if( pMod ){
Module *pDel;
char *zCopy = (char *)(&pMod[1]);
memcpy(zCopy, zName, nName+1);
pMod->zName = zCopy;
pMod->pModule = pModule;
pMod->pAux = pAux;
pMod->xDestroy = xDestroy;
pMod->pEpoTab = 0;
pDel = (Module *)sqlite3HashInsert(&db->aModule,zCopy,(void*)pMod);
assert( pDel==0 || pDel==pMod );
if( pDel ){
db->mallocFailed = 1;
sqlite3DbFree(db, pDel);
}
}
}
rc = sqlite3ApiExit(db, rc);
if( rc!=SQLITE_OK && xDestroy ) xDestroy(pAux);
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Given the name of a compile-time option, return true if that option
** was used and false if not.
**
** The name can optionally begin with "SQLITE_" but the "SQLITE_" prefix
** is not required for a match.
*/
int sqlite3_compileoption_used(const char *zOptName){
int i, n;
#if SQLITE_ENABLE_API_ARMOR
if( zOptName==0 ){
(void)SQLITE_MISUSE_BKPT;
return 0;
}
#endif
if( sqlite3StrNICmp(zOptName, "SQLITE_", 7)==0 ) zOptName += 7;
n = sqlite3Strlen30(zOptName);
/* Since ArraySize(azCompileOpt) is normally in single digits, a
** linear search is adequate. No need for a binary search. */
for(i=0; i<ArraySize(azCompileOpt); i++){
if( sqlite3StrNICmp(zOptName, azCompileOpt[i], n)==0
&& sqlite3IsIdChar((unsigned char)azCompileOpt[i][n])==0
){
return 1;
}
}
return 0;
}
/*
** Insert a new FuncDef into a FuncDefHash hash table.
*/
void sqlite3InsertBuiltinFuncs(
FuncDef *aDef, /* List of global functions to be inserted */
int nDef /* Length of the apDef[] list */
){
int i;
for(i=0; i<nDef; i++){
FuncDef *pOther;
const char *zName = aDef[i].zName;
int nName = sqlite3Strlen30(zName);
int h = (zName[0] + nName) % SQLITE_FUNC_HASH_SZ;
assert( zName[0]>='a' && zName[0]<='z' );
pOther = functionSearch(h, zName);
if( pOther ){
assert( pOther!=&aDef[i] && pOther->pNext!=&aDef[i] );
aDef[i].pNext = pOther->pNext;
pOther->pNext = &aDef[i];
}else{
aDef[i].pNext = 0;
aDef[i].u.pHash = sqlite3BuiltinFunctions.a[h];
sqlite3BuiltinFunctions.a[h] = &aDef[i];
}
}
}
/*
** The actual function that does the work of creating a new module.
** This function implements the sqlite3_create_module() and
** sqlite3_create_module_v2() interfaces.
*/
static int createModule(
sqlite3 *db, /* Database in which module is registered */
const char *zName, /* Name assigned to this module */
const sqlite3_module *pModule, /* The definition of the module */
void *pAux, /* Context pointer for xCreate/xConnect */
void (*xDestroy)(void *) /* Module destructor function */
){
int rc, nName;
Module *pMod;
sqlite3_mutex_enter(db->mutex);
nName = sqlite3Strlen30(zName);
pMod = (Module *)sqlite3DbMallocRaw(db, sizeof(Module) + nName + 1);
if( pMod ){
Module *pDel;
char *zCopy = (char *)(&pMod[1]);
memcpy(zCopy, zName, nName+1);
pMod->zName = zCopy;
pMod->pModule = pModule;
pMod->pAux = pAux;
pMod->xDestroy = xDestroy;
pDel = (Module *)sqlite3HashInsert(&db->aModule, zCopy, nName, (void*)pMod);
if( pDel && pDel->xDestroy ){
pDel->xDestroy(pDel->pAux);
}
sqlite3DbFree(db, pDel);
if( pDel==pMod ){
db->mallocFailed = 1;
}
sqlite3ResetInternalSchema(db, 0);
}else if( xDestroy ){
xDestroy(pAux);
}
rc = sqlite3ApiExit(db, SQLITE_OK);
sqlite3_mutex_leave(db->mutex);
return rc;
}
/*
** Locate and return an entry from the db.aCollSeq hash table. If the entry
** specified by zName and nName is not found and parameter 'create' is
** true, then create a new entry. Otherwise return NULL.
**
** Each pointer stored in the sqlite3.aCollSeq hash table contains an
** array of three CollSeq structures. The first is the collation sequence
** prefferred for UTF-8, the second UTF-16le, and the third UTF-16be.
**
** Stored immediately after the three collation sequences is a copy of
** the collation sequence name. A pointer to this string is stored in
** each collation sequence structure.
*/
static CollSeq *findCollSeqEntry(
sqlite3 *db, /* Database connection */
const char *zName, /* Name of the collating sequence */
int create /* Create a new entry if true */
){
CollSeq *pColl;
int nName = sqlite3Strlen30(zName);
pColl = sqlite3HashFind(&db->aCollSeq, zName, nName);
if( 0==pColl && create ){
pColl = sqlite3DbMallocZero(db, 3*sizeof(*pColl) + nName + 1 );
if( pColl ){
CollSeq *pDel = 0;
pColl[0].zName = (char*)&pColl[3];
pColl[0].enc = SQLITE_UTF8;
pColl[1].zName = (char*)&pColl[3];
pColl[1].enc = SQLITE_UTF16LE;
pColl[2].zName = (char*)&pColl[3];
pColl[2].enc = SQLITE_UTF16BE;
memcpy(pColl[0].zName, zName, nName);
pColl[0].zName[nName] = 0;
pDel = sqlite3HashInsert(&db->aCollSeq, pColl[0].zName, nName, pColl);
/* If a malloc() failure occurred in sqlite3HashInsert(), it will
** return the pColl pointer to be deleted (because it wasn't added
** to the hash table).
*/
assert( pDel==0 || pDel==pColl );
if( pDel!=0 ){
db->mallocFailed = 1;
sqlite3DbFree(db, pDel);
pColl = 0;
}
}
}
return pColl;
}
/*
** Free all memory associated with foreign key definitions attached to
** table pTab. Remove the deleted foreign keys from the Schema.fkeyHash
** hash table.
*/
void sqlite3FkDelete(sqlite3 *db, Table *pTab){
FKey *pFKey; /* Iterator variable */
FKey *pNext; /* Copy of pFKey->pNextFrom */
assert( db==0 || sqlite3SchemaMutexHeld(db, 0, pTab->pSchema) );
for(pFKey=pTab->pFKey; pFKey; pFKey=pNext){
/* Remove the FK from the fkeyHash hash table. */
if( !db || db->pnBytesFreed==0 ){
if( pFKey->pPrevTo ){
pFKey->pPrevTo->pNextTo = pFKey->pNextTo;
}else{
void *p = (void *)pFKey->pNextTo;
const char *z = (p ? pFKey->pNextTo->zTo : pFKey->zTo);
sqlite3HashInsert(&pTab->pSchema->fkeyHash, z, sqlite3Strlen30(z), p);
}
if( pFKey->pNextTo ){
pFKey->pNextTo->pPrevTo = pFKey->pPrevTo;
}
}
/* EV: R-30323-21917 Each foreign key constraint in SQLite is
** classified as either immediate or deferred.
*/
assert( pFKey->isDeferred==0 || pFKey->isDeferred==1 );
/* Delete any triggers created to implement actions for this FK. */
#ifndef SQLITE_OMIT_TRIGGER
fkTriggerDelete(db, pFKey->apTrigger[0]);
fkTriggerDelete(db, pFKey->apTrigger[1]);
#endif
pNext = pFKey->pNextFrom;
sqlite3DbFree(db, pFKey);
}
}
