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Improvements to the SQLITE_MISUSE detection logic. Also added test cases

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for this logic, including the new test file "misuse.test". (CVS 559)

FossilOrigin-Name: f42907ce457e012592f8c043dc6c915e87258b35
This commit is contained in:
drh
2002-05-10 13:14:07 +00:00
parent 247be43d60
commit c22bd47d55
16 changed files with 437 additions and 111 deletions
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82
src/util.c
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@@ -14,7 +14,7 @@
** This file contains functions for allocating memory, comparing
** strings, and stuff like that.
**
** $Id: util.c,v 1.42 2002/05/10 05:44:56 drh Exp $
** $Id: util.c,v 1.43 2002/05/10 13:14:07 drh Exp $
*/
#include "sqliteInt.h"
#include <stdarg.h>
@@ -1069,35 +1069,57 @@ sqliteLikeCompare(const unsigned char *zPattern, const unsigned char *zString){
}
/*
** Return a static string that describes the kind of error specified in the
** argument.
** Change the sqlite.magic from SQLITE_MAGIC_OPEN to SQLITE_MAGIC_BUSY.
** Return an error (non-zero) if the magic was not SQLITE_MAGIC_OPEN
** when this routine is called.
**
** This routine is a attempt to detect if two threads use the
** same sqlite* pointer at the same time. There is a race
** condition so it is possible that the error is not detected.
** But usually the problem will be seen. The result will be an
** error which can be used to debugging the application that is
** using SQLite incorrectly.
*/
const char *sqlite_error_string(int rc){
const char *z;
switch( rc ){
case SQLITE_OK: z = "not an error"; break;
case SQLITE_ERROR: z = "SQL logic error or missing database"; break;
case SQLITE_INTERNAL: z = "internal SQLite implementation flaw"; break;
case SQLITE_PERM: z = "access permission denied"; break;
case SQLITE_ABORT: z = "callback requested query abort"; break;
case SQLITE_BUSY: z = "database is locked"; break;
case SQLITE_LOCKED: z = "database table is locked"; break;
case SQLITE_NOMEM: z = "out of memory"; break;
case SQLITE_READONLY: z = "attempt to write a readonly database"; break;
case SQLITE_INTERRUPT: z = "interrupted"; break;
case SQLITE_IOERR: z = "disk I/O error"; break;
case SQLITE_CORRUPT: z = "database disk image is malformed"; break;
case SQLITE_NOTFOUND: z = "table or record not found"; break;
case SQLITE_FULL: z = "database is full"; break;
case SQLITE_CANTOPEN: z = "unable to open database file"; break;
case SQLITE_PROTOCOL: z = "database locking protocol failure"; break;
case SQLITE_EMPTY: z = "table contains no data"; break;
case SQLITE_SCHEMA: z = "database schema has changed"; break;
case SQLITE_TOOBIG: z = "too much data for one table row"; break;
case SQLITE_CONSTRAINT: z = "constraint failed"; break;
case SQLITE_MISMATCH: z = "datatype mismatch"; break;
case SQLITE_MISUSE: z = "SQLite library used incorrectly"; break;
default: z = "unknown error"; break;
int sqliteSafetyOn(sqlite *db){
if( db->magic==SQLITE_MAGIC_OPEN ){
db->magic = SQLITE_MAGIC_BUSY;
return 0;
}else{
db->magic = SQLITE_MAGIC_ERROR;
db->flags |= SQLITE_Interrupt;
return 1;
}
return z;
}
/*
** Change the magic from SQLITE_MAGIC_BUSY to SQLITE_MAGIC_OPEN.
** Return an error (non-zero) if the magic was not SQLITE_MAGIC_BUSY
** when this routine is called.
*/
int sqliteSafetyOff(sqlite *db){
if( db->magic==SQLITE_MAGIC_BUSY ){
db->magic = SQLITE_MAGIC_OPEN;
return 0;
}else{
db->magic = SQLITE_MAGIC_ERROR;
db->flags |= SQLITE_Interrupt;
return 1;
}
}
/*
** Check to make sure we are not currently executing an sqlite_exec().
** If we are currently in an sqlite_exec(), return true and set
** sqlite.magic to SQLITE_MAGIC_ERROR. This will cause a complete
** shutdown of the database.
**
** This routine is used to try to detect when API routines are called
** at the wrong time or in the wrong sequence.
*/
int sqliteSafetyCheck(sqlite *db){
if( db->recursionDepth ){
db->magic = SQLITE_MAGIC_ERROR;
return 1;
}
return 0;
}