Take care not to leave a zombie attached database if the attachment fails

due to an encoding mismatch.  Update attach logic to always use dynamically
allocated error message strings. (CVS 6573)

FossilOrigin-Name: a6cb4002ada311b56fa2b7430b98b9a0fa698a01

manifest

@@ -1,5 +1,5 @@
-C Remove\salways-true\stests\sfrom\sattach.c.\s\sIn\sbtree.c,\salways\stest\sthe\sreturn\nfrom\ssqlite3PagerSetPagesize()\ssince\sit\smight\sreturn\sSQLITE_NOMEM.\s(CVS\s6572)
-D 2009-04-30T01:22:41
+C Take\scare\snot\sto\sleave\sa\szombie\sattached\sdatabase\sif\sthe\sattachment\sfails\ndue\sto\san\sencoding\smismatch.\s\sUpdate\sattach\slogic\sto\salways\suse\sdynamically\nallocated\serror\smessage\sstrings.\s(CVS\s6573)
+D 2009-04-30T05:19:04
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in 583e87706abc3026960ed759aff6371faf84c211
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -101,7 +101,7 @@ F sqlite3.1 6be1ad09113570e1fc8dcaff84c9b0b337db5ffc
 F sqlite3.pc.in ae6f59a76e862f5c561eb32a380228a02afc3cad
 F src/alter.c 8ab5824bde0a03dae5829f61557ab7c72757000a
 F src/analyze.c e239496cfb5394ac8867f1c112905ddab8d01cd9
-F src/attach.c b3bc7d3c63426abebc28866a62ed317d9a207895
+F src/attach.c 38e6ad955ac54be32d2daa55fffdfbdc7cd01ace
 F src/auth.c c8b2ab5c8bad4bd90ed7c294694f48269162c627
 F src/backup.c 0082d0e5a63f04e88faee0dff0a7d63d3e92a78d
 F src/bitvec.c ef370407e03440b0852d05024fb016b14a471d3d
@@ -725,7 +725,7 @@ F tool/speedtest16.c c8a9c793df96db7e4933f0852abb7a03d48f2e81
 F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
-P 71756dc870910665ef5fdbc7343bc3eedbe3ce65
-R deffbd686d1897bfec739f5ed6ad0e41
+P 8bf60b24ffcf6ac15f41eaa7f976b810e0c66734
+R 32e5b87554b74f04442dc5abc482ed4a
 U drh
-Z b2a0488e881b8258a5c5a932a53fd373
+Z f244ab0788ad7a9d214fdf73c2314ea5

manifest.uuid

@@ -1 +1 @@
-8bf60b24ffcf6ac15f41eaa7f976b810e0c66734
+a6cb4002ada311b56fa2b7430b98b9a0fa698a01

src/attach.c

@@ -11,7 +11,7 @@
 *************************************************************************
 ** This file contains code used to implement the ATTACH and DETACH commands.
 **
-** $Id: attach.c,v 1.85 2009/04/30 01:22:41 drh Exp $
+** $Id: attach.c,v 1.86 2009/04/30 05:19:04 drh Exp $
 */
 #include "sqliteInt.h"
 
@@ -74,7 +74,6 @@ static void attachFunc(
   const char *zFile;
   Db *aNew;
   char *zErrDyn = 0;
-  char zErr[128];
 
   UNUSED_PARAMETER(NotUsed);
 
@@ -90,23 +89,20 @@ static void attachFunc(
   **     * Specified database name already being used.
   */
   if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
-    sqlite3_snprintf(
-      sizeof(zErr), zErr, "too many attached databases - max %d", 
+    zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d", 
       db->aLimit[SQLITE_LIMIT_ATTACHED]
     );
     goto attach_error;
   }
   if( !db->autoCommit ){
-    sqlite3_snprintf(sizeof(zErr), zErr,
-                     "cannot ATTACH database within transaction");
+    zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction");
     goto attach_error;
   }
   for(i=0; i<db->nDb; i++){
     char *z = db->aDb[i].zName;
     assert( z && zName );
     if( sqlite3StrICmp(z, zName)==0 ){
-      sqlite3_snprintf(sizeof(zErr), zErr, 
-                       "database %s is already in use", zName);
+      zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
       goto attach_error;
     }
   }
@@ -139,9 +135,9 @@ static void attachFunc(
     if( !aNew->pSchema ){
       rc = SQLITE_NOMEM;
     }else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){
-      sqlite3_snprintf(sizeof(zErr), zErr, 
+      zErrDyn = sqlite3MPrintf(db, 
         "attached databases must use the same text encoding as main database");
-      goto attach_error;
+      rc = SQLITE_ERROR;
     }
     pPager = sqlite3BtreePager(aNew->pBt);
     sqlite3PagerLockingMode(pPager, db->dfltLockMode);
@@ -204,9 +200,9 @@ static void attachFunc(
     db->nDb = iDb;
     if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
       db->mallocFailed = 1;
-      sqlite3_snprintf(sizeof(zErr),zErr, "out of memory");
-    }else{
-      sqlite3_snprintf(sizeof(zErr),zErr, "unable to open database: %s", zFile);
+      zErrDyn = sqlite3MPrintf(db, "out of memory");
+    }else if( zErrDyn==0 ){
+      zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile);
     }
     goto attach_error;
   }
@@ -218,9 +214,6 @@ attach_error:
   if( zErrDyn ){
     sqlite3_result_error(context, zErrDyn, -1);
     sqlite3DbFree(db, zErrDyn);
-  }else{
-    zErr[sizeof(zErr)-1] = 0;
-    sqlite3_result_error(context, zErr, -1);
   }
   if( rc ) sqlite3_result_error_code(context, rc);
 }
@@ -412,7 +405,7 @@ int sqlite3FixInit(
 ){
   sqlite3 *db;
 
-  if( iDb<0 || iDb==1 ) return 0;
+  if( NEVER(iDb<0) || iDb==1 ) return 0;
   db = pParse->db;
   assert( db->nDb>iDb );
   pFix->pParse = pParse;
@@ -444,7 +437,7 @@ int sqlite3FixSrcList(
   const char *zDb;
   struct SrcList_item *pItem;
 
-  if( pList==0 ) return 0;
+  if( NEVER(pList==0) ) return 0;
   zDb = pFix->zDb;
   for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
     if( pItem->zDatabase==0 ){