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// Character Traits for use by standard string and iostream -*- C++ -*-

// Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library 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; either version 2, or (at your option)

// any later version.

// This library 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 library; see the file COPYING.  If not, write to the Free

// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,

// USA.

// As a special exception, you may use this file as part of a free software

// library without restriction.  Specifically, if other files instantiate

// templates or use macros or inline functions from this file, or you compile

// this file and link it with other files to produce an executable, this

// file does not by itself cause the resulting executable to be covered by

// the GNU General Public License.  This exception does not however

// invalidate any other reasons why the executable file might be covered by

// the GNU General Public License.

//

// ISO C++ 14882: 21  Strings library

//

#ifndef _CPP_BITS_CHAR_TRAITS_H

#define _CPP_BITS_CHAR_TRAITS_H 1

#pragma GCC system_header

#include  	// For memmove, memset, memchr

#include  		// For streampos

namespace std

{

  // 21.1.2 Basis for explicit _Traits specialization

  // NB: That for any given actual character type this definition is

  // probably wrong.

  template

    struct char_traits

    {

      typedef _CharT 		char_type;

      // Unsigned as wint_t in unsigned.

      typedef unsigned long  	int_type;

      typedef streampos 	pos_type;

      typedef streamoff 	off_type;

      typedef mbstate_t 	state_type;

      static void

      assign(char_type& __c1, const char_type& __c2)

      { __c1 = __c2; }

      static bool

      eq(const char_type& __c1, const char_type& __c2)

      { return __c1 == __c2; }

      static bool

      lt(const char_type& __c1, const char_type& __c2)

      { return __c1 < __c2; }

      static int

      compare(const char_type* __s1, const char_type* __s2, size_t __n)

      {

	for (size_t __i = 0; __i < __n; ++__i)

	  if (!eq(__s1[__i], __s2[__i]))

	    return lt(__s1[__i], __s2[__i]) ? -1 : 1;

	return 0;

      }

      static size_t

      length(const char_type* __s)

      {

	const char_type* __p = __s;

	while (*__p) ++__p;

	return (__p - __s);

      }

      static const char_type*

      find(const char_type* __s, size_t __n, const char_type& __a)

      {

	for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)

	  if (*__p == __a) return __p;

	return 0;

      }

      static char_type*

      move(char_type* __s1, const char_type* __s2, size_t __n)

      { return (char_type*) memmove(__s1, __s2, __n * sizeof(char_type)); }

      static char_type*

      copy(char_type* __s1, const char_type* __s2, size_t __n)

      { return (char_type*) memcpy(__s1, __s2, __n * sizeof(char_type)); }

      static char_type*

      assign(char_type* __s, size_t __n, char_type __a)

      {

	for (char_type* __p = __s; __p < __s + __n; ++__p)

	  assign(*__p, __a);

        return __s;

      }

      static char_type

      to_char_type(const int_type& __c)

      { return char_type(__c); }

      static int_type

      to_int_type(const char_type& __c) { return int_type(__c); }

      static bool

      eq_int_type(const int_type& __c1, const int_type& __c2)

      { return __c1 == __c2; }

      static int_type

      eof() { return static_cast(-1); }

      static int_type

      not_eof(const int_type& __c)

      { return eq_int_type(__c, eof()) ? int_type(0) : __c; }

    };

  // 21.1.4  char_traits specializations

  template<>

    struct char_traits

    {

      typedef char 		char_type;

      typedef int 	        int_type;

      typedef streampos 	pos_type;

      typedef streamoff 	off_type;

      typedef mbstate_t 	state_type;

      static void

      assign(char_type& __c1, const char_type& __c2)

      { __c1 = __c2; }

      static bool

      eq(const char_type& __c1, const char_type& __c2)

      { return __c1 == __c2; }

      static bool

      lt(const char_type& __c1, const char_type& __c2)

      { return __c1 < __c2; }

      static int

      compare(const char_type* __s1, const char_type* __s2, size_t __n)

      { return memcmp(__s1, __s2, __n); }

      static size_t

      length(const char_type* __s)

      { return strlen(__s); }

      static const char_type*

      find(const char_type* __s, size_t __n, const char_type& __a)

      { return static_cast(memchr(__s, __a, __n)); }

      static char_type*

      move(char_type* __s1, const char_type* __s2, size_t __n)

      { return static_cast(memmove(__s1, __s2, __n)); }

      static char_type*

      copy(char_type* __s1, const char_type* __s2, size_t __n)

      {  return static_cast(memcpy(__s1, __s2, __n)); }

      static char_type*

      assign(char_type* __s, size_t __n, char_type __a)

      { return static_cast(memset(__s, __a, __n)); }

      static char_type

      to_char_type(const int_type& __c)

      { return static_cast(__c); }

      // To keep both the byte 0xff and the eof symbol 0xffffffff

      // from ending up as 0xffffffff.

      static int_type

      to_int_type(const char_type& __c)

      { return static_cast(static_cast(__c)); }

      static bool

      eq_int_type(const int_type& __c1, const int_type& __c2)

      { return __c1 == __c2; }

      static int_type

      eof() { return static_cast(EOF); }

      static int_type

      not_eof(const int_type& __c)

      { return (__c == eof()) ? 0 : __c; }

  };

#ifdef _GLIBCPP_USE_WCHAR_T

  template<>

    struct char_traits

    {

      typedef wchar_t 		char_type;

      typedef wint_t 		int_type;

      typedef streamoff 	off_type;

      typedef wstreampos 	pos_type;

      typedef mbstate_t 	state_type;

      static void

      assign(char_type& __c1, const char_type& __c2)

      { __c1 = __c2; }

      static bool

      eq(const char_type& __c1, const char_type& __c2)

      { return __c1 == __c2; }

      static bool

      lt(const char_type& __c1, const char_type& __c2)

      { return __c1 < __c2; }

      static int

      compare(const char_type* __s1, const char_type* __s2, size_t __n)

      { return wmemcmp(__s1, __s2, __n); }

      static size_t

      length(const char_type* __s)

      { return wcslen(__s); }

      static const char_type*

      find(const char_type* __s, size_t __n, const char_type& __a)

      { return wmemchr(__s, __a, __n); }

      static char_type*

      move(char_type* __s1, const char_type* __s2, int_type __n)

      { return wmemmove(__s1, __s2, __n); }

      static char_type*

      copy(char_type* __s1, const char_type* __s2, size_t __n)

      { return wmemcpy(__s1, __s2, __n); }

      static char_type*

      assign(char_type* __s, size_t __n, char_type __a)

      { return wmemset(__s, __a, __n); }

      static char_type

      to_char_type(const int_type& __c) { return char_type(__c); }

      static int_type

      to_int_type(const char_type& __c) { return int_type(__c); }

      static bool

      eq_int_type(const int_type& __c1, const int_type& __c2)

      { return __c1 == __c2; }

      static int_type

      eof() { return static_cast(WEOF); }

      static int_type

      not_eof(const int_type& __c)

      { return eq_int_type(__c, eof()) ? 0 : __c; }

  };

#endif //_GLIBCPP_USE_WCHAR_T

  template

    struct _Char_traits_match

    {

      _CharT _M_c;

      _Char_traits_match(_CharT const& __c) : _M_c(__c) { }

      bool

      operator()(_CharT const& __a) { return _Traits::eq(_M_c, __a); }

    };

} // namespace std

#endif