Making old tables seen with "#mysql50#" prefix,

which makes it possible to run RENAME TABLE
  on old tables when upgrading from 5.0.
  TODO: A stored procedure to rename all tables and
  databases with old name format into new format,
  it will simplify upgrade.
sql_table.cc:
  Making old tables seen with "#mysql50#" prefix.
  Adding warning into .err log when an old name is found.
sql_show.cc:
  Skip non-directories before filename_to_tablename
  call, to avoid unnecessary warnings.
strfunc.cc:
  Adding "error" argument to strconvert()
mysql_priv.h:
  Adding "error" agrument to strconvert()

sql/mysql_priv.h

@@ -1504,20 +1504,11 @@ char *fn_rext(char *name);
 
 /* Conversion functions */
 uint strconvert(CHARSET_INFO *from_cs, const char *from,
-                CHARSET_INFO *to_cs, char *to, uint to_length);
+                CHARSET_INFO *to_cs, char *to, uint to_length, uint *errors);
+uint filename_to_tablename(const char *from, char *to, uint to_length);
+uint tablename_to_filename(const char *from, char *to, uint to_length);
 uint build_table_filename(char *buff, size_t bufflen, const char *db,
                           const char *table, const char *ext);
-inline uint filename_to_tablename(const char *from, char *to, uint to_length)
-{
-  return strconvert(&my_charset_filename, from,
-                    system_charset_info, to, to_length);
-}
-inline uint tablename_to_filename(const char *from, char *to, uint to_length)
-{
-  return strconvert(system_charset_info, from,
-                    &my_charset_filename, to, to_length);
-}
-
 /* from hostname.cc */
 struct in_addr;
 my_string ip_to_hostname(struct in_addr *in,uint *errors);

sql/sql_show.cc

@@ -437,9 +437,10 @@ mysql_find_files(THD *thd,List<char> *files, const char *db,const char *path,
                continue;
        }
 #endif
+      if (!MY_S_ISDIR(file->mystat->st_mode))
+        continue;
       VOID(filename_to_tablename(file->name, uname, sizeof(uname)));
-      if (!MY_S_ISDIR(file->mystat->st_mode) ||
+      if (wild && wild_compare(uname, wild, 0))
-          (wild && wild_compare(uname, wild, 0)))
         continue;
       file->name= uname;
     }

sql/sql_table.cc

@@ -102,6 +102,38 @@ static bool abort_and_upgrade_lock(THD *thd, TABLE *table, const char *db,
   DBUG_RETURN(FALSE);
 }
 
+
+#define MYSQL50_TABLE_NAME_PREFIX         "#mysql50#"
+#define MYSQL50_TABLE_NAME_PREFIX_LENGTH  9
+
+uint filename_to_tablename(const char *from, char *to, uint to_length)
+{
+  uint errors, res= strconvert(&my_charset_filename, from,
+                               system_charset_info,  to, to_length, &errors);
+  if (errors) // Old 5.0 name
+  {
+    res= strxnmov(to, to_length, MYSQL50_TABLE_NAME_PREFIX,  from, NullS) - to;
+    sql_print_error("Invalid (old?) table or database name '%s'", from);
+    /*
+      TODO: add a stored procedure for fix table and database names,
+      and mention its name in error log.
+    */
+  }
+  return res;
+}
+
+
+uint tablename_to_filename(const char *from, char *to, uint to_length)
+{
+  uint errors;
+  if (from[0] && !strncmp(from, MYSQL50_TABLE_NAME_PREFIX,
+                          MYSQL50_TABLE_NAME_PREFIX_LENGTH))
+    return my_snprintf(to, to_length, "%s", from + 9);
+  return strconvert(system_charset_info, from,
+                    &my_charset_filename, to, to_length, &errors);
+}
+
+
 /*
   Creates path to a file: mysql_data_dir/db/table.ext
 

sql/strfunc.cc

@@ -258,7 +258,7 @@ uint check_word(TYPELIB *lib, const char *val, const char *end,
 
 
 uint strconvert(CHARSET_INFO *from_cs, const char *from,
-                CHARSET_INFO *to_cs, char *to, uint to_length)
+                CHARSET_INFO *to_cs, char *to, uint to_length, uint *errors)
 {
   int cnvres;
   my_wc_t wc;
@@ -308,6 +308,7 @@ outp:
       break;
   }
   *to= '\0';
+  *errors= error_count;
   return (uint32) (to - to_start);
 
 }