WL#1324 table name to file name encoding

- Encoding itself, implemented as a charset
  "filename". Originally planned to use '.'
  as an escape character, but now changed to '@'
  for two reasons: "ls" does not return
  file names starting with '.' considering them
  as a kind of hidden files; some platforms
  do not allow several dots in a file name.
- replacing many calls of my_snprintf() and
  strnxmov() to the new build_table_filename().
- Adding MY_APPEND_EXT mysys flag, to append
  an extention rather that replace it.
- Replacing all numeric constants in fn_format
  flag arguments to their mysys definitions, e.g.
  MY_UNPACK_FILENAME,
- Predictability in several function/methods:
  when a table name can appear with or withot .frm
  extension. Some functions/methods were changed
  so accept names strictly with .frm, other - strictly
  without .frm extensions. Several DBUG_ASSERTs were
  added to check whether an extension is passed.
Many files:
  table name to file name encoding
mysql_priv.h:
  Prototypes for new table name encoding tools.
ctype-utf8.c:
  Implementing "filename" charset for
  table name to file name encoding.
row0mysql.c:
  Fixing table name prefix.
mf_format.c:
  Adding MY_APPEND_EXT processing.
Many files:
  Fixing tests.
my_sys.h:
  Adding new flag to append rather than replace an extension.
m_ctype.h:
  Adding "filename" charset definition.


include/m_ctype.h:
  Adding "filename" charset definition.
include/my_sys.h:
  Adding new flag to append rather than replace an extension.
mysql-test/t/alter_table.test:
  Fixing tests.
mysql-test/t/create.test:
  Fixing tests.
mysql-test/t/show_check.test:
  Fixing tests.
mysql-test/r/alter_table.result:
  Fixing tests.
mysql-test/r/create.result:
  Fixing tests.
mysql-test/r/mysqldump.result:
  Fixing tests.
mysys/mf_format.c:
  Adding MY_APPEND_EXT processing.
sql/discover.cc:
  table name to file name encoding
sql/ha_berkeley.cc:
  table name to file name encoding
sql/ha_innodb.cc:
  table name to file name encoding
sql/ha_myisam.cc:
  table name to file name encoding
sql/ha_myisammrg.cc:
  table name to file name encoding
sql/ha_ndbcluster.cc:
  table name to file name encoding
sql/ha_partition.cc:
  table name to file name encoding
sql/handler.cc:
  table name to file name encoding.
sql/init.cc:
  table name to file name encoding
sql/mysqld.cc:
  table name to file name encoding
sql/parse_file.cc:
  table name to file name encoding
sql/sql_acl.cc:
  table name to file name encoding
sql/sql_base.cc:
  table name to file name encoding
sql/sql_db.cc:
  table name to file name encoding
sql/sql_delete.cc:
  table name to file name encoding
sql/sql_rename.cc:
  table name to file name encoding
sql/sql_show.cc:
  table name to file name encoding
sql/sql_table.cc:
  table name to file name encoding
sql/sql_trigger.cc:
  table name to file name encoding
sql/sql_view.cc:
  table name to file name encoding
sql/strfunc.cc:
  table name to file name encoding
sql/table.cc:
  table name to file name encoding
sql/unireg.cc:
  table name to file name encoding
storage/innobase/row/row0mysql.c:
  Fixing table name prefix.
  ,
storage/myisam/mi_create.c:
  table name to file name encoding
storage/myisam/mi_delete_table.c:
  table name to file name encoding
storage/myisam/mi_open.c:
  table name to file name encoding
storage/myisam/mi_rename.c:
  table name to file name encoding
strings/ctype-utf8.c:
  Implementing "filename" charset for
  table name to file name encoding.
sql/mysql_priv.h:
  Prototypes for new table name encoding tools.
storage/myisammrg/myrg_create.c:
  table name to file name encoding
storage/myisammrg/myrg_open.c:
  table name to file name encoding

sql/sql_delete.cc

@@ -837,6 +837,7 @@ bool mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok)
   char path[FN_REFLEN];
   TABLE *table;
   bool error;
+  uint path_length;
   DBUG_ENTER("mysql_truncate");
 
   bzero((char*) &create_info,sizeof(create_info));
@@ -867,9 +868,8 @@ bool mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok)
     goto end;
   }
 
-  (void) sprintf(path,"%s/%s/%s%s",mysql_data_home,table_list->db,
-		 table_list->table_name,reg_ext);
-  fn_format(path, path, "", "", MY_UNPACK_FILENAME);
+  path_length= build_table_filename(path, sizeof(path), table_list->db,
+                                    table_list->table_name, reg_ext);
 
   if (!dont_send_ok)
   {
@@ -889,7 +889,8 @@ bool mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok)
       DBUG_RETURN(TRUE);
   }
 
-  *fn_ext(path)=0;				// Remove the .frm extension
+  // Remove the .frm extension
+  *(path + path_length - reg_ext_length)= '\0';
   error= ha_create_table(thd, path, table_list->db, table_list->table_name,
                          &create_info, 1);
   query_cache_invalidate3(thd, table_list, 0);