~drizzle-trunk/drizzle/development

/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "mysys_priv.h"

#include <m_string.h>

/*

  List of file names that causes problem on windows

  NOTE that one can also not have file names of type CON.TXT

  NOTE: it is important to keep "CLOCK$" on the first place,

  we skip it in check_if_legal_tablename.

*/

static const char *reserved_names[]=

{

  "CLOCK$",

  "CON", "PRN", "AUX", "NUL",

  "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",

  "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",

  NullS

};

#define MAX_RESERVED_NAME_LENGTH 6

/*

  Looks up a null-terminated string in a list,

  case insensitively.

  SYNOPSIS

    str_list_find()

    list        list of items

    str         item to find

  RETURN

    0  ok

    1  reserved file name

*/

static int str_list_find(const char **list, const char *str)

{

  const char **name;

  for (name= list; *name; name++)

  {

    if (!my_strcasecmp(&my_charset_latin1, *name, str))

      return 1;

  }

  return 0;

}

/*

  A map for faster reserved_names lookup,

  helps to avoid loops in many cases.

  1 - can be the first letter

  2 - can be the second letter

  4 - can be the third letter

*/

static char reserved_map[256]=

{

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /*  !"#$%&'()*+,-./ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0123456789:;<=>? */

  0,1,0,1,0,0,0,0,0,0,0,0,7,4,5,2, /* @ABCDEFGHIJKLMNO */

  3,0,2,0,4,2,0,0,4,0,0,0,0,0,0,0, /* PQRSTUVWXYZ[\]^_ */

  0,1,0,1,0,0,0,0,0,0,0,0,7,4,5,2, /* 
bcdefghijklmno */

  3,0,2,0,4,2,0,0,4,0,0,0,0,0,0,0, /* pqrstuvwxyz{|}~. */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* ................ */

  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0  /* ................ */

};

/*

  Check if a table name may cause problems

  SYNOPSIS

    check_if_legal_tablename

    name 	Table name (without any extensions)

  DESCRIPTION

    We don't check 'CLOCK$' because dollar sign is encoded as @0024,

    making table file name 'CLOCK@0024', which is safe.

    This is why we start lookup from the second element

    (i.e. &reserver_name[1])

  RETURN

    0  ok

    1  reserved file name

*/

int check_if_legal_tablename(const char *name)

{

  DBUG_ENTER("check_if_legal_tablename");

  DBUG_RETURN((reserved_map[(uchar) name[0]] & 1) &&

              (reserved_map[(uchar) name[1]] & 2) &&

              (reserved_map[(uchar) name[2]] & 4) &&

              str_list_find(&reserved_names[1], name));

}