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3787 lines (3521 loc) · 115 KB
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/*
** 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.
**
*************************************************************************
** A TCL Interface to SQLite. Append this file to sqlite3.c and
** compile the whole thing to build a TCL-enabled version of SQLite.
**
** Compile-time options:
**
** -DTCLSH=1 Add a "main()" routine that works as a tclsh.
**
** -DSQLITE_TCLMD5 When used in conjuction with -DTCLSH=1, add
** four new commands to the TCL interpreter for
** generating MD5 checksums: md5, md5file,
** md5-10x8, and md5file-10x8.
**
** -DSQLITE_TEST When used in conjuction with -DTCLSH=1, add
** hundreds of new commands used for testing
** SQLite. This option implies -DSQLITE_TCLMD5.
*/
#include "tcl.h"
#include <errno.h>
/*
** Some additional include files are needed if this file is not
** appended to the amalgamation.
*/
#ifndef SQLITE_AMALGAMATION
# include "sqlite3.h"
# include <stdlib.h>
# include <string.h>
# include <assert.h>
typedef unsigned char u8;
#endif
#include <ctype.h>
/*
* Windows needs to know which symbols to export. Unix does not.
* BUILD_sqlite should be undefined for Unix.
*/
#ifdef BUILD_sqlite
#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLEXPORT
#endif /* BUILD_sqlite */
#define NUM_PREPARED_STMTS 10
#define MAX_PREPARED_STMTS 100
/* Forward declaration */
typedef struct SqliteDb SqliteDb;
/*
** New SQL functions can be created as TCL scripts. Each such function
** is described by an instance of the following structure.
*/
typedef struct SqlFunc SqlFunc;
struct SqlFunc {
Tcl_Interp *interp; /* The TCL interpret to execute the function */
Tcl_Obj *pScript; /* The Tcl_Obj representation of the script */
SqliteDb *pDb; /* Database connection that owns this function */
int useEvalObjv; /* True if it is safe to use Tcl_EvalObjv */
char *zName; /* Name of this function */
SqlFunc *pNext; /* Next function on the list of them all */
};
/*
** New collation sequences function can be created as TCL scripts. Each such
** function is described by an instance of the following structure.
*/
typedef struct SqlCollate SqlCollate;
struct SqlCollate {
Tcl_Interp *interp; /* The TCL interpret to execute the function */
char *zScript; /* The script to be run */
SqlCollate *pNext; /* Next function on the list of them all */
};
/*
** Prepared statements are cached for faster execution. Each prepared
** statement is described by an instance of the following structure.
*/
typedef struct SqlPreparedStmt SqlPreparedStmt;
struct SqlPreparedStmt {
SqlPreparedStmt *pNext; /* Next in linked list */
SqlPreparedStmt *pPrev; /* Previous on the list */
sqlite3_stmt *pStmt; /* The prepared statement */
int nSql; /* chars in zSql[] */
const char *zSql; /* Text of the SQL statement */
int nParm; /* Size of apParm array */
Tcl_Obj **apParm; /* Array of referenced object pointers */
};
typedef struct IncrblobChannel IncrblobChannel;
/*
** There is one instance of this structure for each SQLite database
** that has been opened by the SQLite TCL interface.
**
** If this module is built with SQLITE_TEST defined (to create the SQLite
** testfixture executable), then it may be configured to use either
** sqlite3_prepare_v2() or sqlite3_prepare() to prepare SQL statements.
** If SqliteDb.bLegacyPrepare is true, sqlite3_prepare() is used.
*/
struct SqliteDb {
sqlite3 *db; /* The "real" database structure. MUST BE FIRST */
Tcl_Interp *interp; /* The interpreter used for this database */
char *zBusy; /* The busy callback routine */
char *zCommit; /* The commit hook callback routine */
char *zTrace; /* The trace callback routine */
char *zProfile; /* The profile callback routine */
char *zProgress; /* The progress callback routine */
char *zAuth; /* The authorization callback routine */
int disableAuth; /* Disable the authorizer if it exists */
char *zNull; /* Text to substitute for an SQL NULL value */
SqlFunc *pFunc; /* List of SQL functions */
Tcl_Obj *pUpdateHook; /* Update hook script (if any) */
Tcl_Obj *pRollbackHook; /* Rollback hook script (if any) */
Tcl_Obj *pWalHook; /* WAL hook script (if any) */
Tcl_Obj *pUnlockNotify; /* Unlock notify script (if any) */
SqlCollate *pCollate; /* List of SQL collation functions */
int rc; /* Return code of most recent sqlite3_exec() */
Tcl_Obj *pCollateNeeded; /* Collation needed script */
SqlPreparedStmt *stmtList; /* List of prepared statements*/
SqlPreparedStmt *stmtLast; /* Last statement in the list */
int maxStmt; /* The next maximum number of stmtList */
int nStmt; /* Number of statements in stmtList */
IncrblobChannel *pIncrblob;/* Linked list of open incrblob channels */
int nStep, nSort, nIndex; /* Statistics for most recent operation */
int nTransaction; /* Number of nested [transaction] methods */
#ifdef SQLITE_TEST
int bLegacyPrepare; /* True to use sqlite3_prepare() */
#endif
};
struct IncrblobChannel {
sqlite3_blob *pBlob; /* sqlite3 blob handle */
SqliteDb *pDb; /* Associated database connection */
int iSeek; /* Current seek offset */
Tcl_Channel channel; /* Channel identifier */
IncrblobChannel *pNext; /* Linked list of all open incrblob channels */
IncrblobChannel *pPrev; /* Linked list of all open incrblob channels */
};
/*
** Compute a string length that is limited to what can be stored in
** lower 30 bits of a 32-bit signed integer.
*/
static int strlen30(const char *z){
const char *z2 = z;
while( *z2 ){ z2++; }
return 0x3fffffff & (int)(z2 - z);
}
#ifndef SQLITE_OMIT_INCRBLOB
/*
** Close all incrblob channels opened using database connection pDb.
** This is called when shutting down the database connection.
*/
static void closeIncrblobChannels(SqliteDb *pDb){
IncrblobChannel *p;
IncrblobChannel *pNext;
for(p=pDb->pIncrblob; p; p=pNext){
pNext = p->pNext;
/* Note: Calling unregister here call Tcl_Close on the incrblob channel,
** which deletes the IncrblobChannel structure at *p. So do not
** call Tcl_Free() here.
*/
Tcl_UnregisterChannel(pDb->interp, p->channel);
}
}
/*
** Close an incremental blob channel.
*/
static int incrblobClose(ClientData instanceData, Tcl_Interp *interp){
IncrblobChannel *p = (IncrblobChannel *)instanceData;
int rc = sqlite3_blob_close(p->pBlob);
sqlite3 *db = p->pDb->db;
/* Remove the channel from the SqliteDb.pIncrblob list. */
if( p->pNext ){
p->pNext->pPrev = p->pPrev;
}
if( p->pPrev ){
p->pPrev->pNext = p->pNext;
}
if( p->pDb->pIncrblob==p ){
p->pDb->pIncrblob = p->pNext;
}
/* Free the IncrblobChannel structure */
Tcl_Free((char *)p);
if( rc!=SQLITE_OK ){
Tcl_SetResult(interp, (char *)sqlite3_errmsg(db), TCL_VOLATILE);
return TCL_ERROR;
}
return TCL_OK;
}
/*
** Read data from an incremental blob channel.
*/
static int incrblobInput(
ClientData instanceData,
char *buf,
int bufSize,
int *errorCodePtr
){
IncrblobChannel *p = (IncrblobChannel *)instanceData;
int nRead = bufSize; /* Number of bytes to read */
int nBlob; /* Total size of the blob */
int rc; /* sqlite error code */
nBlob = sqlite3_blob_bytes(p->pBlob);
if( (p->iSeek+nRead)>nBlob ){
nRead = nBlob-p->iSeek;
}
if( nRead<=0 ){
return 0;
}
rc = sqlite3_blob_read(p->pBlob, (void *)buf, nRead, p->iSeek);
if( rc!=SQLITE_OK ){
*errorCodePtr = rc;
return -1;
}
p->iSeek += nRead;
return nRead;
}
/*
** Write data to an incremental blob channel.
*/
static int incrblobOutput(
ClientData instanceData,
CONST char *buf,
int toWrite,
int *errorCodePtr
){
IncrblobChannel *p = (IncrblobChannel *)instanceData;
int nWrite = toWrite; /* Number of bytes to write */
int nBlob; /* Total size of the blob */
int rc; /* sqlite error code */
nBlob = sqlite3_blob_bytes(p->pBlob);
if( (p->iSeek+nWrite)>nBlob ){
*errorCodePtr = EINVAL;
return -1;
}
if( nWrite<=0 ){
return 0;
}
rc = sqlite3_blob_write(p->pBlob, (void *)buf, nWrite, p->iSeek);
if( rc!=SQLITE_OK ){
*errorCodePtr = EIO;
return -1;
}
p->iSeek += nWrite;
return nWrite;
}
/*
** Seek an incremental blob channel.
*/
static int incrblobSeek(
ClientData instanceData,
long offset,
int seekMode,
int *errorCodePtr
){
IncrblobChannel *p = (IncrblobChannel *)instanceData;
switch( seekMode ){
case SEEK_SET:
p->iSeek = offset;
break;
case SEEK_CUR:
p->iSeek += offset;
break;
case SEEK_END:
p->iSeek = sqlite3_blob_bytes(p->pBlob) + offset;
break;
default: assert(!"Bad seekMode");
}
return p->iSeek;
}
static void incrblobWatch(ClientData instanceData, int mode){
/* NO-OP */
}
static int incrblobHandle(ClientData instanceData, int dir, ClientData *hPtr){
return TCL_ERROR;
}
static Tcl_ChannelType IncrblobChannelType = {
"incrblob", /* typeName */
TCL_CHANNEL_VERSION_2, /* version */
incrblobClose, /* closeProc */
incrblobInput, /* inputProc */
incrblobOutput, /* outputProc */
incrblobSeek, /* seekProc */
0, /* setOptionProc */
0, /* getOptionProc */
incrblobWatch, /* watchProc (this is a no-op) */
incrblobHandle, /* getHandleProc (always returns error) */
0, /* close2Proc */
0, /* blockModeProc */
0, /* flushProc */
0, /* handlerProc */
0, /* wideSeekProc */
};
/*
** Create a new incrblob channel.
*/
static int createIncrblobChannel(
Tcl_Interp *interp,
SqliteDb *pDb,
const char *zDb,
const char *zTable,
const char *zColumn,
sqlite_int64 iRow,
int isReadonly
){
IncrblobChannel *p;
sqlite3 *db = pDb->db;
sqlite3_blob *pBlob;
int rc;
int flags = TCL_READABLE|(isReadonly ? 0 : TCL_WRITABLE);
/* This variable is used to name the channels: "incrblob_[incr count]" */
static int count = 0;
char zChannel[64];
rc = sqlite3_blob_open(db, zDb, zTable, zColumn, iRow, !isReadonly, &pBlob);
if( rc!=SQLITE_OK ){
Tcl_SetResult(interp, (char *)sqlite3_errmsg(pDb->db), TCL_VOLATILE);
return TCL_ERROR;
}
p = (IncrblobChannel *)Tcl_Alloc(sizeof(IncrblobChannel));
p->iSeek = 0;
p->pBlob = pBlob;
sqlite3_snprintf(sizeof(zChannel), zChannel, "incrblob_%d", ++count);
p->channel = Tcl_CreateChannel(&IncrblobChannelType, zChannel, p, flags);
Tcl_RegisterChannel(interp, p->channel);
/* Link the new channel into the SqliteDb.pIncrblob list. */
p->pNext = pDb->pIncrblob;
p->pPrev = 0;
if( p->pNext ){
p->pNext->pPrev = p;
}
pDb->pIncrblob = p;
p->pDb = pDb;
Tcl_SetResult(interp, (char *)Tcl_GetChannelName(p->channel), TCL_VOLATILE);
return TCL_OK;
}
#else /* else clause for "#ifndef SQLITE_OMIT_INCRBLOB" */
#define closeIncrblobChannels(pDb)
#endif
/*
** Look at the script prefix in pCmd. We will be executing this script
** after first appending one or more arguments. This routine analyzes
** the script to see if it is safe to use Tcl_EvalObjv() on the script
** rather than the more general Tcl_EvalEx(). Tcl_EvalObjv() is much
** faster.
**
** Scripts that are safe to use with Tcl_EvalObjv() consists of a
** command name followed by zero or more arguments with no [...] or $
** or {...} or ; to be seen anywhere. Most callback scripts consist
** of just a single procedure name and they meet this requirement.
*/
static int safeToUseEvalObjv(Tcl_Interp *interp, Tcl_Obj *pCmd){
/* We could try to do something with Tcl_Parse(). But we will instead
** just do a search for forbidden characters. If any of the forbidden
** characters appear in pCmd, we will report the string as unsafe.
*/
const char *z;
int n;
z = Tcl_GetStringFromObj(pCmd, &n);
while( n-- > 0 ){
int c = *(z++);
if( c=='$' || c=='[' || c==';' ) return 0;
}
return 1;
}
/*
** Find an SqlFunc structure with the given name. Or create a new
** one if an existing one cannot be found. Return a pointer to the
** structure.
*/
static SqlFunc *findSqlFunc(SqliteDb *pDb, const char *zName){
SqlFunc *p, *pNew;
int i;
pNew = (SqlFunc*)Tcl_Alloc( sizeof(*pNew) + strlen30(zName) + 1 );
pNew->zName = (char*)&pNew[1];
for(i=0; zName[i]; i++){ pNew->zName[i] = tolower(zName[i]); }
pNew->zName[i] = 0;
for(p=pDb->pFunc; p; p=p->pNext){
if( strcmp(p->zName, pNew->zName)==0 ){
Tcl_Free((char*)pNew);
return p;
}
}
pNew->interp = pDb->interp;
pNew->pDb = pDb;
pNew->pScript = 0;
pNew->pNext = pDb->pFunc;
pDb->pFunc = pNew;
return pNew;
}
/*
** Free a single SqlPreparedStmt object.
*/
static void dbFreeStmt(SqlPreparedStmt *pStmt){
#ifdef SQLITE_TEST
if( sqlite3_sql(pStmt->pStmt)==0 ){
Tcl_Free((char *)pStmt->zSql);
}
#endif
sqlite3_finalize(pStmt->pStmt);
Tcl_Free((char *)pStmt);
}
/*
** Finalize and free a list of prepared statements
*/
static void flushStmtCache(SqliteDb *pDb){
SqlPreparedStmt *pPreStmt;
SqlPreparedStmt *pNext;
for(pPreStmt = pDb->stmtList; pPreStmt; pPreStmt=pNext){
pNext = pPreStmt->pNext;
dbFreeStmt(pPreStmt);
}
pDb->nStmt = 0;
pDb->stmtLast = 0;
pDb->stmtList = 0;
}
/*
** TCL calls this procedure when an sqlite3 database command is
** deleted.
*/
static void DbDeleteCmd(void *db){
SqliteDb *pDb = (SqliteDb*)db;
flushStmtCache(pDb);
closeIncrblobChannels(pDb);
sqlite3_close(pDb->db);
while( pDb->pFunc ){
SqlFunc *pFunc = pDb->pFunc;
pDb->pFunc = pFunc->pNext;
assert( pFunc->pDb==pDb );
Tcl_DecrRefCount(pFunc->pScript);
Tcl_Free((char*)pFunc);
}
while( pDb->pCollate ){
SqlCollate *pCollate = pDb->pCollate;
pDb->pCollate = pCollate->pNext;
Tcl_Free((char*)pCollate);
}
if( pDb->zBusy ){
Tcl_Free(pDb->zBusy);
}
if( pDb->zTrace ){
Tcl_Free(pDb->zTrace);
}
if( pDb->zProfile ){
Tcl_Free(pDb->zProfile);
}
if( pDb->zAuth ){
Tcl_Free(pDb->zAuth);
}
if( pDb->zNull ){
Tcl_Free(pDb->zNull);
}
if( pDb->pUpdateHook ){
Tcl_DecrRefCount(pDb->pUpdateHook);
}
if( pDb->pRollbackHook ){
Tcl_DecrRefCount(pDb->pRollbackHook);
}
if( pDb->pWalHook ){
Tcl_DecrRefCount(pDb->pWalHook);
}
if( pDb->pCollateNeeded ){
Tcl_DecrRefCount(pDb->pCollateNeeded);
}
Tcl_Free((char*)pDb);
}
/*
** This routine is called when a database file is locked while trying
** to execute SQL.
*/
static int DbBusyHandler(void *cd, int nTries){
SqliteDb *pDb = (SqliteDb*)cd;
int rc;
char zVal[30];
sqlite3_snprintf(sizeof(zVal), zVal, "%d", nTries);
rc = Tcl_VarEval(pDb->interp, pDb->zBusy, " ", zVal, (char*)0);
if( rc!=TCL_OK || atoi(Tcl_GetStringResult(pDb->interp)) ){
return 0;
}
return 1;
}
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
/*
** This routine is invoked as the 'progress callback' for the database.
*/
static int DbProgressHandler(void *cd){
SqliteDb *pDb = (SqliteDb*)cd;
int rc;
assert( pDb->zProgress );
rc = Tcl_Eval(pDb->interp, pDb->zProgress);
if( rc!=TCL_OK || atoi(Tcl_GetStringResult(pDb->interp)) ){
return 1;
}
return 0;
}
#endif
#ifndef SQLITE_OMIT_TRACE
/*
** This routine is called by the SQLite trace handler whenever a new
** block of SQL is executed. The TCL script in pDb->zTrace is executed.
*/
static void DbTraceHandler(void *cd, const char *zSql){
SqliteDb *pDb = (SqliteDb*)cd;
Tcl_DString str;
Tcl_DStringInit(&str);
Tcl_DStringAppend(&str, pDb->zTrace, -1);
Tcl_DStringAppendElement(&str, zSql);
Tcl_Eval(pDb->interp, Tcl_DStringValue(&str));
Tcl_DStringFree(&str);
Tcl_ResetResult(pDb->interp);
}
#endif
#ifndef SQLITE_OMIT_TRACE
/*
** This routine is called by the SQLite profile handler after a statement
** SQL has executed. The TCL script in pDb->zProfile is evaluated.
*/
static void DbProfileHandler(void *cd, const char *zSql, sqlite_uint64 tm){
SqliteDb *pDb = (SqliteDb*)cd;
Tcl_DString str;
char zTm[100];
sqlite3_snprintf(sizeof(zTm)-1, zTm, "%lld", tm);
Tcl_DStringInit(&str);
Tcl_DStringAppend(&str, pDb->zProfile, -1);
Tcl_DStringAppendElement(&str, zSql);
Tcl_DStringAppendElement(&str, zTm);
Tcl_Eval(pDb->interp, Tcl_DStringValue(&str));
Tcl_DStringFree(&str);
Tcl_ResetResult(pDb->interp);
}
#endif
/*
** This routine is called when a transaction is committed. The
** TCL script in pDb->zCommit is executed. If it returns non-zero or
** if it throws an exception, the transaction is rolled back instead
** of being committed.
*/
static int DbCommitHandler(void *cd){
SqliteDb *pDb = (SqliteDb*)cd;
int rc;
rc = Tcl_Eval(pDb->interp, pDb->zCommit);
if( rc!=TCL_OK || atoi(Tcl_GetStringResult(pDb->interp)) ){
return 1;
}
return 0;
}
static void DbRollbackHandler(void *clientData){
SqliteDb *pDb = (SqliteDb*)clientData;
assert(pDb->pRollbackHook);
if( TCL_OK!=Tcl_EvalObjEx(pDb->interp, pDb->pRollbackHook, 0) ){
Tcl_BackgroundError(pDb->interp);
}
}
/*
** This procedure handles wal_hook callbacks.
*/
static int DbWalHandler(
void *clientData,
sqlite3 *db,
const char *zDb,
int nEntry
){
int ret = SQLITE_OK;
Tcl_Obj *p;
SqliteDb *pDb = (SqliteDb*)clientData;
Tcl_Interp *interp = pDb->interp;
assert(pDb->pWalHook);
p = Tcl_DuplicateObj(pDb->pWalHook);
Tcl_IncrRefCount(p);
Tcl_ListObjAppendElement(interp, p, Tcl_NewStringObj(zDb, -1));
Tcl_ListObjAppendElement(interp, p, Tcl_NewIntObj(nEntry));
if( TCL_OK!=Tcl_EvalObjEx(interp, p, 0)
|| TCL_OK!=Tcl_GetIntFromObj(interp, Tcl_GetObjResult(interp), &ret)
){
Tcl_BackgroundError(interp);
}
Tcl_DecrRefCount(p);
return ret;
}
#if defined(SQLITE_TEST) && defined(SQLITE_ENABLE_UNLOCK_NOTIFY)
static void setTestUnlockNotifyVars(Tcl_Interp *interp, int iArg, int nArg){
char zBuf[64];
sprintf(zBuf, "%d", iArg);
Tcl_SetVar(interp, "sqlite_unlock_notify_arg", zBuf, TCL_GLOBAL_ONLY);
sprintf(zBuf, "%d", nArg);
Tcl_SetVar(interp, "sqlite_unlock_notify_argcount", zBuf, TCL_GLOBAL_ONLY);
}
#else
# define setTestUnlockNotifyVars(x,y,z)
#endif
#ifdef SQLITE_ENABLE_UNLOCK_NOTIFY
static void DbUnlockNotify(void **apArg, int nArg){
int i;
for(i=0; i<nArg; i++){
const int flags = (TCL_EVAL_GLOBAL|TCL_EVAL_DIRECT);
SqliteDb *pDb = (SqliteDb *)apArg[i];
setTestUnlockNotifyVars(pDb->interp, i, nArg);
assert( pDb->pUnlockNotify);
Tcl_EvalObjEx(pDb->interp, pDb->pUnlockNotify, flags);
Tcl_DecrRefCount(pDb->pUnlockNotify);
pDb->pUnlockNotify = 0;
}
}
#endif
static void DbUpdateHandler(
void *p,
int op,
const char *zDb,
const char *zTbl,
sqlite_int64 rowid
){
SqliteDb *pDb = (SqliteDb *)p;
Tcl_Obj *pCmd;
assert( pDb->pUpdateHook );
assert( op==SQLITE_INSERT || op==SQLITE_UPDATE || op==SQLITE_DELETE );
pCmd = Tcl_DuplicateObj(pDb->pUpdateHook);
Tcl_IncrRefCount(pCmd);
Tcl_ListObjAppendElement(0, pCmd, Tcl_NewStringObj(
( (op==SQLITE_INSERT)?"INSERT":(op==SQLITE_UPDATE)?"UPDATE":"DELETE"), -1));
Tcl_ListObjAppendElement(0, pCmd, Tcl_NewStringObj(zDb, -1));
Tcl_ListObjAppendElement(0, pCmd, Tcl_NewStringObj(zTbl, -1));
Tcl_ListObjAppendElement(0, pCmd, Tcl_NewWideIntObj(rowid));
Tcl_EvalObjEx(pDb->interp, pCmd, TCL_EVAL_DIRECT);
Tcl_DecrRefCount(pCmd);
}
static void tclCollateNeeded(
void *pCtx,
sqlite3 *db,
int enc,
const char *zName
){
SqliteDb *pDb = (SqliteDb *)pCtx;
Tcl_Obj *pScript = Tcl_DuplicateObj(pDb->pCollateNeeded);
Tcl_IncrRefCount(pScript);
Tcl_ListObjAppendElement(0, pScript, Tcl_NewStringObj(zName, -1));
Tcl_EvalObjEx(pDb->interp, pScript, 0);
Tcl_DecrRefCount(pScript);
}
/*
** This routine is called to evaluate an SQL collation function implemented
** using TCL script.
*/
static int tclSqlCollate(
void *pCtx,
int nA,
const void *zA,
int nB,
const void *zB
){
SqlCollate *p = (SqlCollate *)pCtx;
Tcl_Obj *pCmd;
pCmd = Tcl_NewStringObj(p->zScript, -1);
Tcl_IncrRefCount(pCmd);
Tcl_ListObjAppendElement(p->interp, pCmd, Tcl_NewStringObj(zA, nA));
Tcl_ListObjAppendElement(p->interp, pCmd, Tcl_NewStringObj(zB, nB));
Tcl_EvalObjEx(p->interp, pCmd, TCL_EVAL_DIRECT);
Tcl_DecrRefCount(pCmd);
return (atoi(Tcl_GetStringResult(p->interp)));
}
/*
** This routine is called to evaluate an SQL function implemented
** using TCL script.
*/
static void tclSqlFunc(sqlite3_context *context, int argc, sqlite3_value**argv){
SqlFunc *p = sqlite3_user_data(context);
Tcl_Obj *pCmd;
int i;
int rc;
if( argc==0 ){
/* If there are no arguments to the function, call Tcl_EvalObjEx on the
** script object directly. This allows the TCL compiler to generate
** bytecode for the command on the first invocation and thus make
** subsequent invocations much faster. */
pCmd = p->pScript;
Tcl_IncrRefCount(pCmd);
rc = Tcl_EvalObjEx(p->interp, pCmd, 0);
Tcl_DecrRefCount(pCmd);
}else{
/* If there are arguments to the function, make a shallow copy of the
** script object, lappend the arguments, then evaluate the copy.
**
** By "shallow" copy, we mean a only the outer list Tcl_Obj is duplicated.
** The new Tcl_Obj contains pointers to the original list elements.
** That way, when Tcl_EvalObjv() is run and shimmers the first element
** of the list to tclCmdNameType, that alternate representation will
** be preserved and reused on the next invocation.
*/
Tcl_Obj **aArg;
int nArg;
if( Tcl_ListObjGetElements(p->interp, p->pScript, &nArg, &aArg) ){
sqlite3_result_error(context, Tcl_GetStringResult(p->interp), -1);
return;
}
pCmd = Tcl_NewListObj(nArg, aArg);
Tcl_IncrRefCount(pCmd);
for(i=0; i<argc; i++){
sqlite3_value *pIn = argv[i];
Tcl_Obj *pVal;
/* Set pVal to contain the i'th column of this row. */
switch( sqlite3_value_type(pIn) ){
case SQLITE_BLOB: {
int bytes = sqlite3_value_bytes(pIn);
pVal = Tcl_NewByteArrayObj(sqlite3_value_blob(pIn), bytes);
break;
}
case SQLITE_INTEGER: {
sqlite_int64 v = sqlite3_value_int64(pIn);
if( v>=-2147483647 && v<=2147483647 ){
pVal = Tcl_NewIntObj((int)v);
}else{
pVal = Tcl_NewWideIntObj(v);
}
break;
}
case SQLITE_FLOAT: {
double r = sqlite3_value_double(pIn);
pVal = Tcl_NewDoubleObj(r);
break;
}
case SQLITE_NULL: {
pVal = Tcl_NewStringObj(p->pDb->zNull, -1);
break;
}
default: {
int bytes = sqlite3_value_bytes(pIn);
pVal = Tcl_NewStringObj((char *)sqlite3_value_text(pIn), bytes);
break;
}
}
rc = Tcl_ListObjAppendElement(p->interp, pCmd, pVal);
if( rc ){
Tcl_DecrRefCount(pCmd);
sqlite3_result_error(context, Tcl_GetStringResult(p->interp), -1);
return;
}
}
if( !p->useEvalObjv ){
/* Tcl_EvalObjEx() will automatically call Tcl_EvalObjv() if pCmd
** is a list without a string representation. To prevent this from
** happening, make sure pCmd has a valid string representation */
Tcl_GetString(pCmd);
}
rc = Tcl_EvalObjEx(p->interp, pCmd, TCL_EVAL_DIRECT);
Tcl_DecrRefCount(pCmd);
}
if( rc && rc!=TCL_RETURN ){
sqlite3_result_error(context, Tcl_GetStringResult(p->interp), -1);
}else{
Tcl_Obj *pVar = Tcl_GetObjResult(p->interp);
int n;
u8 *data;
const char *zType = (pVar->typePtr ? pVar->typePtr->name : "");
char c = zType[0];
if( c=='b' && strcmp(zType,"bytearray")==0 && pVar->bytes==0 ){
/* Only return a BLOB type if the Tcl variable is a bytearray and
** has no string representation. */
data = Tcl_GetByteArrayFromObj(pVar, &n);
sqlite3_result_blob(context, data, n, SQLITE_TRANSIENT);
}else if( c=='b' && strcmp(zType,"boolean")==0 ){
Tcl_GetIntFromObj(0, pVar, &n);
sqlite3_result_int(context, n);
}else if( c=='d' && strcmp(zType,"double")==0 ){
double r;
Tcl_GetDoubleFromObj(0, pVar, &r);
sqlite3_result_double(context, r);
}else if( (c=='w' && strcmp(zType,"wideInt")==0) ||
(c=='i' && strcmp(zType,"int")==0) ){
Tcl_WideInt v;
Tcl_GetWideIntFromObj(0, pVar, &v);
sqlite3_result_int64(context, v);
}else{
data = (unsigned char *)Tcl_GetStringFromObj(pVar, &n);
sqlite3_result_text(context, (char *)data, n, SQLITE_TRANSIENT);
}
}
}
#ifndef SQLITE_OMIT_AUTHORIZATION
/*
** This is the authentication function. It appends the authentication
** type code and the two arguments to zCmd[] then invokes the result
** on the interpreter. The reply is examined to determine if the
** authentication fails or succeeds.
*/
static int auth_callback(
void *pArg,
int code,
const char *zArg1,
const char *zArg2,
const char *zArg3,
const char *zArg4
){
char *zCode;
Tcl_DString str;
int rc;
const char *zReply;
SqliteDb *pDb = (SqliteDb*)pArg;
if( pDb->disableAuth ) return SQLITE_OK;
switch( code ){
case SQLITE_COPY : zCode="SQLITE_COPY"; break;
case SQLITE_CREATE_INDEX : zCode="SQLITE_CREATE_INDEX"; break;
case SQLITE_CREATE_TABLE : zCode="SQLITE_CREATE_TABLE"; break;
case SQLITE_CREATE_TEMP_INDEX : zCode="SQLITE_CREATE_TEMP_INDEX"; break;
case SQLITE_CREATE_TEMP_TABLE : zCode="SQLITE_CREATE_TEMP_TABLE"; break;
case SQLITE_CREATE_TEMP_TRIGGER: zCode="SQLITE_CREATE_TEMP_TRIGGER"; break;
case SQLITE_CREATE_TEMP_VIEW : zCode="SQLITE_CREATE_TEMP_VIEW"; break;
case SQLITE_CREATE_TRIGGER : zCode="SQLITE_CREATE_TRIGGER"; break;
case SQLITE_CREATE_VIEW : zCode="SQLITE_CREATE_VIEW"; break;
case SQLITE_DELETE : zCode="SQLITE_DELETE"; break;
case SQLITE_DROP_INDEX : zCode="SQLITE_DROP_INDEX"; break;
case SQLITE_DROP_TABLE : zCode="SQLITE_DROP_TABLE"; break;
case SQLITE_DROP_TEMP_INDEX : zCode="SQLITE_DROP_TEMP_INDEX"; break;
case SQLITE_DROP_TEMP_TABLE : zCode="SQLITE_DROP_TEMP_TABLE"; break;
case SQLITE_DROP_TEMP_TRIGGER : zCode="SQLITE_DROP_TEMP_TRIGGER"; break;
case SQLITE_DROP_TEMP_VIEW : zCode="SQLITE_DROP_TEMP_VIEW"; break;
case SQLITE_DROP_TRIGGER : zCode="SQLITE_DROP_TRIGGER"; break;
case SQLITE_DROP_VIEW : zCode="SQLITE_DROP_VIEW"; break;
case SQLITE_INSERT : zCode="SQLITE_INSERT"; break;
case SQLITE_PRAGMA : zCode="SQLITE_PRAGMA"; break;
case SQLITE_READ : zCode="SQLITE_READ"; break;
case SQLITE_SELECT : zCode="SQLITE_SELECT"; break;
case SQLITE_TRANSACTION : zCode="SQLITE_TRANSACTION"; break;
case SQLITE_UPDATE : zCode="SQLITE_UPDATE"; break;
case SQLITE_ATTACH : zCode="SQLITE_ATTACH"; break;
case SQLITE_DETACH : zCode="SQLITE_DETACH"; break;
case SQLITE_ALTER_TABLE : zCode="SQLITE_ALTER_TABLE"; break;
case SQLITE_REINDEX : zCode="SQLITE_REINDEX"; break;
case SQLITE_ANALYZE : zCode="SQLITE_ANALYZE"; break;
case SQLITE_CREATE_VTABLE : zCode="SQLITE_CREATE_VTABLE"; break;
case SQLITE_DROP_VTABLE : zCode="SQLITE_DROP_VTABLE"; break;
case SQLITE_FUNCTION : zCode="SQLITE_FUNCTION"; break;
case SQLITE_SAVEPOINT : zCode="SQLITE_SAVEPOINT"; break;
default : zCode="????"; break;
}
Tcl_DStringInit(&str);
Tcl_DStringAppend(&str, pDb->zAuth, -1);
Tcl_DStringAppendElement(&str, zCode);
Tcl_DStringAppendElement(&str, zArg1 ? zArg1 : "");
Tcl_DStringAppendElement(&str, zArg2 ? zArg2 : "");
Tcl_DStringAppendElement(&str, zArg3 ? zArg3 : "");
Tcl_DStringAppendElement(&str, zArg4 ? zArg4 : "");
rc = Tcl_GlobalEval(pDb->interp, Tcl_DStringValue(&str));
Tcl_DStringFree(&str);
zReply = rc==TCL_OK ? Tcl_GetStringResult(pDb->interp) : "SQLITE_DENY";
if( strcmp(zReply,"SQLITE_OK")==0 ){
rc = SQLITE_OK;
}else if( strcmp(zReply,"SQLITE_DENY")==0 ){
rc = SQLITE_DENY;
}else if( strcmp(zReply,"SQLITE_IGNORE")==0 ){
rc = SQLITE_IGNORE;
}else{
rc = 999;
}
return rc;
}
#endif /* SQLITE_OMIT_AUTHORIZATION */
/*
** This routine reads a line of text from FILE in, stores
** the text in memory obtained from malloc() and returns a pointer
** to the text. NULL is returned at end of file, or if malloc()
** fails.
**
** The interface is like "readline" but no command-line editing
** is done.
**
** copied from shell.c from '.import' command
*/
static char *local_getline(char *zPrompt, FILE *in){
char *zLine;
int nLine;
int n;
nLine = 100;
zLine = malloc( nLine );
if( zLine==0 ) return 0;
n = 0;
while( 1 ){
if( n+100>nLine ){
nLine = nLine*2 + 100;
zLine = realloc(zLine, nLine);
if( zLine==0 ) return 0;
}
if( fgets(&zLine[n], nLine - n, in)==0 ){
if( n==0 ){
free(zLine);
return 0;
}
zLine[n] = 0;
break;
}
while( zLine[n] ){ n++; }
if( n>0 && zLine[n-1]=='\n' ){
n--;
zLine[n] = 0;
break;
}
}
zLine = realloc( zLine, n+1 );
return zLine;
}
/*
** This function is part of the implementation of the command:
**
** $db transaction [-deferred|-immediate|-exclusive] SCRIPT
**
** It is invoked after evaluating the script SCRIPT to commit or rollback
** the transaction or savepoint opened by the [transaction] command.
*/
static int DbTransPostCmd(
ClientData data[], /* data[0] is the Sqlite3Db* for $db */
Tcl_Interp *interp, /* Tcl interpreter */
int result /* Result of evaluating SCRIPT */
){
static const char *azEnd[] = {
"RELEASE _tcl_transaction", /* rc==TCL_ERROR, nTransaction!=0 */
"COMMIT", /* rc!=TCL_ERROR, nTransaction==0 */
"ROLLBACK TO _tcl_transaction ; RELEASE _tcl_transaction",
"ROLLBACK" /* rc==TCL_ERROR, nTransaction==0 */
};
SqliteDb *pDb = (SqliteDb*)data[0];
int rc = result;
const char *zEnd;
pDb->nTransaction--;