Fix the load-extension mechanism so that tests build with or without it.

This check-in also includes prototypes for the new sqlite3_limit()
interface, but no implementation. (CVS 4892)

FossilOrigin-Name: bee38c2dda50592fef5fedab01311d5486240b95

manifest

@@ -1,5 +1,5 @@
-C Fix\sbuild\swhether\scompiling\swith\sor\swithout\sauto-extension\senabled\s(CVS\s4891)
+C Fix\sthe\sload-extension\smechanism\sso\sthat\stests\sbuild\swith\sor\swithout\sit.\nThis\scheck-in\salso\sincludes\sprototypes\sfor\sthe\snew\ssqlite3_limit()\ninterface,\sbut\sno\simplementation.\s(CVS\s4892)
-D 2008-03-19T23:52:35
+D 2008-03-20T00:32:20
 F Makefile.arm-wince-mingw32ce-gcc ac5f7b2cef0cd850d6f755ba6ee4ab961b1fadf7
 F Makefile.in 90256feffbc822b56e4ad0ebaa62f5871c8f0334
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -104,7 +104,7 @@ F src/insert.c 358c80592c20a61a8d5b4a127215b5e25de652f4
 F src/journal.c 807bed7a158979ac8d63953e1774e8d85bff65e2
 F src/legacy.c cb1939fdeb91ea88fb44fbd2768a10e14bc44650
 F src/limits.h 71ab25f17e35e0a9f3f6f234b8ed49cc56731d35
-F src/loadext.c 841cf403aa17b9f81655575ea1319bfa256906ad
+F src/loadext.c f26b22f7c84153c9d5dbd7c240848823c6e6b6dc
 F src/main.c bb31f65f7b1870825a4c9a31f19354d566b7633c
 F src/malloc.c 60e392a4c12c839517f9b0db7b995f825444fb35
 F src/md5.c c5fdfa5c2593eaee2e32a5ce6c6927c986eaf217
@@ -139,9 +139,9 @@ F src/random.c 8b6ab5418cf0f4dde551730825d67da1457c2b3c
 F src/select.c d0a1e01a2a6c05bd60324e843c7e4581d3605950
 F src/server.c 087b92a39d883e3fa113cae259d64e4c7438bc96
 F src/shell.c 22297fffa6f00a6c6d44020fa13b1184a1bb372d
-F src/sqlite.h.in d8acd2881bdd1def5dfcc280ebc86a60f248ba0b
+F src/sqlite.h.in c82088b99b3262c017ddadc14d45b2d5877cbeae
 F src/sqlite3ext.h faacd0e6a81aabee0861c6d7883c9172e74ef5b3
-F src/sqliteInt.h e7596d5491f65aafe00c0f63f41aedf2a8e007a3
+F src/sqliteInt.h ed823fb087e57a09762bc1f4e0935761a8d57c7b
 F src/sqliteLimit.h ee4430f88f69bf63527967bb35ca52af7b0ccb1e
 F src/table.c 2c48c575dd59b3a6c5c306bc55f51a9402cf429a
 F src/tclsqlite.c d42912617d4734b8f9195416badf5b27e512ded2
@@ -624,7 +624,7 @@ F www/tclsqlite.tcl 8be95ee6dba05eabcd27a9d91331c803f2ce2130
 F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
 F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
 F www/whentouse.tcl fc46eae081251c3c181bd79c5faef8195d7991a5
-P 41d6ca31acbc0bd8555e5487ba3b695db5c9a81a
+P 7b9682c65f545b09d410173cf282f7c4f4438097
-R 693688e3ad80e102aa500e44231d652a
+R 76d2140ea564d8c5d493dbf1333aa75b
-U mlcreech
+U drh
-Z 7c18fbe1ac8b3b0218100603a8bf0e3e
+Z b969d76f2e36df97ac59ac53a61f759c

manifest.uuid

@@ -1 +1 @@
-7b9682c65f545b09d410173cf282f7c4f4438097
+bee38c2dda50592fef5fedab01311d5486240b95

src/loadext.c

@@ -436,13 +436,15 @@ int sqlite3_enable_load_extension(sqlite3 *db, int onoff){
   return SQLITE_OK;
 }
 
-#endif /* SQLITE_OMIT_LOADEXTENSION */
+#endif /* SQLITE_OMIT_LOAD_EXTENSION */
 
 /*
-** The following code is added regardless of whether or not extension
+** The auto-extension code added regardless of whether or not extension
-** loading is supported.
+** loading is supported.  We need a dummy sqlite3Apis pointer for that
+** code if regular extension loading is not available.  This is that
+** dummy pointer.
 */
-#ifdef SQLITE_OMIT_LOAD_EXTENSTION
+#ifdef SQLITE_OMIT_LOAD_EXTENSION
 const sqlite3_api_routines sqlite3Apis = { 0 };
 #endif
 
@@ -501,9 +503,6 @@ void sqlite3_reset_auto_extension(void){
   sqlite3_mutex_leave(mutex);
 }
 
-
-#ifndef SQLITE_OMIT_LOAD_EXTENSION
-
 /*
 ** Load all automatic extensions.
 */
@@ -539,5 +538,3 @@ int sqlite3AutoLoadExtensions(sqlite3 *db){
   }
   return rc;
 }
-
-#endif /* SQLITE_OMIT_LOADEXTENSION */

src/sqlite.h.in

@@ -30,7 +30,7 @@
 ** the version number) and changes its name to "sqlite3.h" as
 ** part of the build process.
 **
-** @(#) $Id: sqlite.h.in,v 1.294 2008/03/19 21:45:51 drh Exp $
+** @(#) $Id: sqlite.h.in,v 1.295 2008/03/20 00:32:20 drh Exp $
 */
 #ifndef _SQLITE3_H_
 #define _SQLITE3_H_
@@ -2155,6 +2155,68 @@ const void *sqlite3_errmsg16(sqlite3*);
 */
 typedef struct sqlite3_stmt sqlite3_stmt;
 
+/*
+** CAPI3REF: Run-time Limits {F12760}
+**
+** This interface allows the size of various constructs to be limited
+** on a connection by connection basis.  The first parameter is the
+** [database connection] whose limit is to be set or queried.  The
+** second parameter is one of the [limit categories] that define a
+** class of constructs to be size limited.  The third parameter is the
+** new limit for that construct.  The function returns the old limit.
+**
+** If the new limit is a negative number, the limit is unchanged.
+** If the new limit is zero, the construct becomes unlimited.  Actually,
+** there is a hard upper bound on the size of all constructs that
+** is determined at compile-time.  For the limit category of 
+** SQLITE_LIMIT_XYZ the hard upper bound is the compile-time
+** constant SQLITE_MAX_XYZ.  Attempts to increase a limit above its
+** hard upper bound are silently truncated.
+**
+** This interface is currently considered experimental and is subject
+** to change or removal without prior notice.
+**
+** INVARIANTS:
+**
+** {F12763} A successful call to [sqlite3_limit(D,C,V)] where V is
+**          positive changes the
+**          limit on the size of construct C in [database connetion] D
+**          to the lessor of V and the hard upper bound on the size
+**          of C that is set at compile-time.
+**
+** {F12763} A successful call to [sqlite3_limit(D,C,V)] where V is zero
+**          changes the limit on the size of construct C in
+**          [database connetion] D to be the hard upper bound on the size
+**          of C that is set at compile-time.
+**
+** {F12766} A successful call to [sqlite3_limit(D,C,V)] where V is negative
+**          leaves the state of [database connection] D unchanged.
+**
+** {F12769} A successful call to [sqlite3_limit(D,C,V)] returns the
+**          value of the limit on the size of construct C in
+**          in [database connetion] D as it was prior to the call.
+*/
+int sqlite3_limit(sqlite3*, int id, int newVal);
+
+/*
+** CAPI3REF: Run-Time Limit Categories {F12790}
+** KEYWORDS: {limit category} {limit categories}
+** 
+** These constants define various aspects of a [database connection]
+** that can be limited in size by calls to [sqlite3_limit()].
+*/
+#define SQLITE_LIMIT_LENGTH                    0
+#define SQLITE_LIMIT_SQL_LENGTH                1
+#define SQLITE_LIMIT_COLUMN                    2
+#define SQLITE_LIMIT_EXPR_DEPTH                3
+#define SQLITE_LIMIT_COMPOUND_SELECT           4
+#define SQLITE_LIMIT_VDBE_OP                   5
+#define SQLITE_LIMIT_FUNCTION_ARG              6
+#define SQLITE_LIMIT_ATTACHED                  7
+#define SQLITE_LIMIT_PAGE_COUNT                8
+#define SQLITE_LIMIT_LIKE_PATTERN_LENGTH       9
+#define SQLITE_LIMIT_VARIABLE_NUMBER          10
+
 /*
 ** CAPI3REF: Compiling An SQL Statement {F13010}
 **

src/sqliteInt.h

@@ -11,7 +11,7 @@
 *************************************************************************
 ** Internal interface definitions for SQLite.
 **
-** @(#) $Id: sqliteInt.h,v 1.674 2008/03/19 14:15:35 drh Exp $
+** @(#) $Id: sqliteInt.h,v 1.675 2008/03/20 00:32:20 drh Exp $
 */
 #ifndef _SQLITEINT_H_
 #define _SQLITEINT_H_
@@ -531,6 +531,11 @@ struct Schema {
 #define DB_UnresetViews    0x0002  /* Some views have defined column names */
 #define DB_Empty           0x0004  /* The file is empty (length 0 bytes) */
 
+/*
+** The number of different kinds of things that can be limited
+** using the sqlite3_limit() interface.
+*/
+#define SQLITE_N_LIMIT (SQLITE_LIMIT_VARIABLE_NUMBER+1)
 
 /*
 ** Each database is an instance of the following structure.
@@ -578,6 +583,7 @@ struct sqlite3 {
   int nChange;                  /* Value returned by sqlite3_changes() */
   int nTotalChange;             /* Value returned by sqlite3_total_changes() */
   sqlite3_mutex *mutex;         /* Connection mutex */
+  int aLimit[SQLITE_N_LIMIT];   /* Limits */
   struct sqlite3InitInfo {      /* Information used during initialization */
     int iDb;                    /* When back is being initialized */
     int newTnum;                /* Rootpage of table being initialized */
@@ -2064,12 +2070,11 @@ void *sqlite3ParserAlloc(void*(*)(size_t));
 void sqlite3ParserFree(void*, void(*)(void*));
 void sqlite3Parser(void*, int, Token, Parse*);
 
+int sqlite3AutoLoadExtensions(sqlite3*);
 #ifndef SQLITE_OMIT_LOAD_EXTENSION
   void sqlite3CloseExtensions(sqlite3*);
-  int sqlite3AutoLoadExtensions(sqlite3*);
 #else
 # define sqlite3CloseExtensions(X)
-# define sqlite3AutoLoadExtensions(X)  SQLITE_OK
 #endif
 
 #ifndef SQLITE_OMIT_SHARED_CACHE