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.

1 files changed, 14 insertions, 2 deletions

diff --git a/sql/parse_file.cc b/sql/parse_file.cc
index fe82054c528..0b2bfe83b6f 100644
--- a/sql/parse_file.cc
+++ b/sql/parse_file.cc
@@ -226,8 +226,20 @@ sql_create_definition_file(const LEX_STRING *dir, const LEX_STRING *file_name,
   DBUG_PRINT("enter", ("Dir: %s, file: %s, base 0x%lx",
 		       dir->str, file_name->str, (ulong) base));
 
-  fn_format(path, file_name->str, dir->str, 0, MY_UNPACK_FILENAME);
-  path_end= strlen(path);
+  if (dir)
+  {
+    fn_format(path, file_name->str, dir->str, 0, MY_UNPACK_FILENAME);
+    path_end= strlen(path);
+  }
+  else
+  {
+    /*
+      if not dir is passed, it means file_name is a full path,
+      including dir name, file name itself, and an extension,
+      and with unpack_filename() executed over it.
+    */    
+    path_end= strxnmov(path, FN_REFLEN, file_name->str, NullS) - path;
+  }
 
   // temporary file name
   path[path_end]='~';