Cleanup ha_checktype() and redundant variables.

libmysqld/lib_sql.cc:
  Removing *_skip variables
sql/ha_berkeley.cc:
  Removing *_skip variables
sql/ha_berkeley.h:
  Removing *_skip variables
sql/ha_innodb.cc:
  Removing *_skip variables
sql/ha_innodb.h:
  Removing *_skip variables
sql/ha_isam.cc:
  Removing *_skip variables
sql/ha_isam.h:
  Removing *_skip variables
sql/handler.cc:
  Removing *_skip variables
  Cleanup ha_checktype()
sql/mysqld.cc:
  Removing *_skip variables
sql/sql_show.cc:
  Removing *_skip variables

libmysqld/lib_sql.cc

@@ -419,7 +419,7 @@ int init_embedded_server(int argc, char **argv, char **groups)
 
   if (
 #ifdef HAVE_BERKELEY_DB
-      !berkeley_skip ||
+      (have_berkeley_db == SHOW_OPTION_YES) ||
 #endif
       (flush_time && flush_time != ~(ulong) 0L))
   {

sql/ha_berkeley.cc

@@ -72,7 +72,7 @@
 #define STATUS_BDB_ANALYZE	4
 
 const char *ha_berkeley_ext=".db";
-bool berkeley_skip=0,berkeley_shared_data=0;
+bool berkeley_shared_data=0;
 u_int32_t berkeley_init_flags= DB_PRIVATE | DB_RECOVER, berkeley_env_flags=0,
           berkeley_lock_type=DB_LOCK_DEFAULT;
 ulong berkeley_cache_size, berkeley_log_buffer_size, berkeley_log_file_size=0;

sql/ha_berkeley.h

@@ -170,7 +170,7 @@ class ha_berkeley: public handler
   uint8 table_cache_type() { return HA_CACHE_TBL_TRANSACT; }
 };
 
-extern bool berkeley_skip, berkeley_shared_data;
+extern bool berkeley_shared_data;
 extern u_int32_t berkeley_init_flags,berkeley_env_flags, berkeley_lock_type,
                  berkeley_lock_types[];
 extern ulong berkeley_cache_size, berkeley_max_lock, berkeley_log_buffer_size;

sql/ha_innodb.cc

@@ -80,7 +80,6 @@ extern "C" {
 #define HA_INNOBASE_ROWS_IN_TABLE 10000 /* to get optimization right */
 #define HA_INNOBASE_RANGE_COUNT	  100
 
-bool 	innodb_skip 		= 0;
 uint 	innobase_init_flags 	= 0;
 ulong 	innobase_cache_size 	= 0;
 
@@ -4758,7 +4757,7 @@ innodb_show_status(
 
         DBUG_ENTER("innodb_show_status");
 
-        if (innodb_skip) {
+        if (have_innodb != SHOW_OPTION_YES) {
                 my_message(ER_NOT_SUPPORTED_YET,
           "Cannot call SHOW INNODB STATUS because skip-innodb is defined",
                            MYF(0));

sql/ha_innodb.h

@@ -190,7 +190,6 @@ class ha_innobase: public handler
         uint8 table_cache_type() { return HA_CACHE_TBL_ASKTRANSACT; }
 };
 
-extern bool innodb_skip;
 extern uint innobase_init_flags, innobase_lock_type;
 extern uint innobase_flush_log_at_trx_commit;
 extern ulong innobase_cache_size;

sql/ha_isam.cc

@@ -34,7 +34,6 @@
 ** isam tables
 *****************************************************************************/
 
-bool isam_skip;
 
 const char **ha_isam::bas_ext() const
 { static const char *ext[]= { ".ISM",".ISD", NullS }; return ext; }

sql/ha_isam.h

@@ -82,4 +82,3 @@ class ha_isam: public handler
 			     enum thr_lock_type lock_type);
 };
 
-extern bool isam_skip;

sql/handler.cc

@@ -120,34 +120,21 @@ const char *ha_get_storage_engine(enum db_type db_type)
 
 enum db_type ha_checktype(enum db_type database_type)
 {
+  show_table_type_st *types;
+  for (types= sys_table_types; types->type; types++)
+  {
+    if ((database_type == types->db_type) && 
+	(SHOW_OPTION_YES == *types->value))
+      return database_type;
+  }
+
   switch (database_type) {
-#ifdef HAVE_BERKELEY_DB
-  case DB_TYPE_BERKELEY_DB:
-    if (berkeley_skip) break;
-    return (database_type);
-#endif
-#ifdef HAVE_INNOBASE_DB
-  case DB_TYPE_INNODB:
-    if (innodb_skip) break;
-    return (database_type);
-#endif
 #ifndef NO_HASH
   case DB_TYPE_HASH:
-#endif
-#ifdef HAVE_ISAM
-  case DB_TYPE_ISAM:
-    if (isam_skip) break;
     return (database_type);
-  case DB_TYPE_MRG_ISAM:
-    return (isam_skip ? DB_TYPE_MRG_MYISAM : database_type);
-#else
+#endif
   case DB_TYPE_MRG_ISAM:
     return (DB_TYPE_MRG_MYISAM);
-#endif
-  case DB_TYPE_HEAP:
-  case DB_TYPE_MYISAM:
-  case DB_TYPE_MRG_MYISAM:
-    return (database_type);			/* Database exists on system */
   default:
     break;
   }
@@ -165,7 +152,8 @@ handler *get_new_handler(TABLE *table, enum db_type db_type)
 {
   switch (db_type) {
 #ifndef NO_HASH
-  return new ha_hash(table);
+  case DB_TYPE_HASH:
+    return new ha_hash(table);
 #endif
 #ifdef HAVE_ISAM
   case DB_TYPE_MRG_ISAM:
@@ -203,30 +191,32 @@ handler *get_new_handler(TABLE *table, enum db_type db_type)
 
 int ha_init()
 {
+  int error= 0;
 #ifdef HAVE_BERKELEY_DB
-  if (!berkeley_skip)
+  if (have_berkeley_db == SHOW_OPTION_YES)
   {
-    int error;
-    if ((error=berkeley_init()))
-      return error;
-    if (!berkeley_skip)				// If we couldn't use handler
-      opt_using_transactions=1;
+    if (berkeley_init())
+    {
+      have_berkeley_db= SHOW_OPTION_DISABLED;	// If we couldn't use handler
+      error= 1;
+    }
     else
-      have_berkeley_db=SHOW_OPTION_DISABLED;
+      opt_using_transactions=1;
   }
 #endif
 #ifdef HAVE_INNOBASE_DB
-  if (!innodb_skip)
+  if (have_innodb == SHOW_OPTION_YES)
   {
     if (innobase_init())
-      return -1;
-    if (!innodb_skip)				// If we couldn't use handler
-      opt_using_transactions=1;
+    {
+      have_innodb= SHOW_OPTION_DISABLED;	// If we couldn't use handler
+      error= 1;
+    }
     else
-      have_innodb=SHOW_OPTION_DISABLED;
+      opt_using_transactions=1;
   }
 #endif
-  return 0;
+  return error;
 }
 
 	/* close, flush or restart databases */
@@ -246,11 +236,11 @@ int ha_panic(enum ha_panic_function flag)
   error|=mi_panic(flag);
   error|=myrg_panic(flag);
 #ifdef HAVE_BERKELEY_DB
-  if (!berkeley_skip)
+  if (have_berkeley_db == SHOW_OPTION_YES)
     error|=berkeley_end();
 #endif
 #ifdef HAVE_INNOBASE_DB
-  if (!innodb_skip)
+  if (have_innodb == SHOW_OPTION_YES)
     error|=innobase_end();
 #endif
   return error;
@@ -259,7 +249,7 @@ int ha_panic(enum ha_panic_function flag)
 void ha_drop_database(char* path)
 {
 #ifdef HAVE_INNOBASE_DB
-  if (!innodb_skip)
+  if (have_innodb == SHOW_OPTION_YES)
     innobase_drop_database(path);
 #endif
 }
@@ -267,7 +257,7 @@ void ha_drop_database(char* path)
 void ha_close_connection(THD* thd)
 {
 #ifdef HAVE_INNOBASE_DB
-  if (!innodb_skip)
+  if (have_innodb == SHOW_OPTION_YES)
     innobase_close_connection(thd);
 #endif
 }
@@ -632,11 +622,13 @@ bool ha_flush_logs()
 {
   bool result=0;
 #ifdef HAVE_BERKELEY_DB
-  if (!berkeley_skip && berkeley_flush_logs())
+  if ((have_berkeley_db == SHOW_OPTION_YES) && 
+      berkeley_flush_logs())
     result=1;
 #endif
 #ifdef HAVE_INNOBASE_DB
-  if (!innodb_skip && innobase_flush_logs())
+  if ((have_innodb == SHOW_OPTION_YES) && 
+      innobase_flush_logs())
     result=1;
 #endif
   return result;

sql/mysqld.cc

@@ -2362,7 +2362,7 @@ static void create_maintenance_thread()
 {
   if (
 #ifdef HAVE_BERKELEY_DB
-      !berkeley_skip ||
+      (have_berkeley_db == SHOW_OPTION_YES) ||
 #endif
       (flush_time && flush_time != ~(ulong) 0L))
   {
@@ -5532,43 +5532,25 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
   case OPT_BDB:
 #ifdef HAVE_BERKELEY_DB
     if (opt_bdb)
-    {
-      berkeley_skip=0;
       have_berkeley_db=SHOW_OPTION_YES;
-    }
     else
-    {
-      berkeley_skip=1;
       have_berkeley_db=SHOW_OPTION_DISABLED;
-    }
 #endif
     break;
   case OPT_ISAM:
 #ifdef HAVE_ISAM
     if (opt_isam)
-    {
-      isam_skip=0;
       have_isam= SHOW_OPTION_YES;
-    }
     else
-    {
-      isam_skip=1;
       have_isam= SHOW_OPTION_DISABLED;
-    }
 #endif
     break;
   case OPT_INNODB:
 #ifdef HAVE_INNOBASE_DB
     if (opt_innodb)
-    {
-      innodb_skip=0;
       have_innodb=SHOW_OPTION_YES;
-    }
     else
-    {
-      innodb_skip=1;
       have_innodb=SHOW_OPTION_DISABLED;
-    }
 #endif
     break;
   case OPT_INNODB_DATA_FILE_PATH:

sql/sql_show.cc

@@ -921,7 +921,7 @@ mysqld_show_logs(THD *thd)
     DBUG_RETURN(1);
 
 #ifdef HAVE_BERKELEY_DB
-  if (!berkeley_skip && berkeley_show_logs(protocol))
+  if ((have_berkeley_db == SHOW_OPTION_YES) && berkeley_show_logs(protocol))
     DBUG_RETURN(-1);
 #endif