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Editing: char_traits.h

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

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
// 2006, 2007, 2008, 2009
// 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file char_traits.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

//
// ISO C++ 14882: 21  Strings library
//

#ifndef _CHAR_TRAITS_H
#define _CHAR_TRAITS_H 1

#pragma GCC system_header

#include <bits/stl_algobase.h>  // std::copy, std::fill_n
#include <bits/postypes.h>      // For streampos
#include <cwchar>               // For WEOF, wmemmove, wmemset, etc.

#ifndef _GLIBCXX_STDIO_MACROS
# include <cstdio>              // For EOF
# define _CHAR_TRAITS_EOF EOF
#else
# define _CHAR_TRAITS_EOF (-1)
#endif

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

/**
   *  @brief  Mapping from character type to associated types.
   *
   *  @note This is an implementation class for the generic version
   *  of char_traits.  It defines int_type, off_type, pos_type, and
   *  state_type.  By default these are unsigned long, streamoff,
   *  streampos, and mbstate_t.  Users who need a different set of
   *  types, but who don't need to change the definitions of any function
   *  defined in char_traits, can specialize __gnu_cxx::_Char_types
   *  while leaving __gnu_cxx::char_traits alone. */
  template<typename _CharT>
    struct _Char_types
    {
      typedef unsigned long   int_type;
      typedef std::streampos  pos_type;
      typedef std::streamoff  off_type;
      typedef std::mbstate_t  state_type;
    };

/**
   *  @brief  Base class used to implement std::char_traits.
   *
   *  @note For any given actual character type, this definition is
   *  probably wrong.  (Most of the member functions are likely to be
   *  right, but the int_type and state_type typedefs, and the eof()
   *  member function, are likely to be wrong.)  The reason this class
   *  exists is so users can specialize it.  Classes in namespace std
   *  may not be specialized for fundamental types, but classes in
   *  namespace __gnu_cxx may be.
   *
   *  See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt05ch13s03.html
   *  for advice on how to make use of this class for "unusual" character
   *  types. Also, check out include/ext/pod_char_traits.h.  
   */
  template<typename _CharT>
    struct char_traits
    {
      typedef _CharT                                    char_type;
      typedef typename _Char_types<_CharT>::int_type    int_type;
      typedef typename _Char_types<_CharT>::pos_type    pos_type;
      typedef typename _Char_types<_CharT>::off_type    off_type;
      typedef typename _Char_types<_CharT>::state_type  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, std::size_t __n);

static std::size_t
      length(const char_type* __s);

static const char_type*
      find(const char_type* __s, std::size_t __n, const char_type& __a);

static char_type*
      move(char_type* __s1, const char_type* __s2, std::size_t __n);

static char_type*
      copy(char_type* __s1, const char_type* __s2, std::size_t __n);

static char_type*
      assign(char_type* __s, std::size_t __n, char_type __a);

static char_type
      to_char_type(const int_type& __c)
      { return static_cast<char_type>(__c); }

static int_type
      to_int_type(const char_type& __c)
      { return static_cast<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<int_type>(_CHAR_TRAITS_EOF); }

static int_type
      not_eof(const int_type& __c)
      { return !eq_int_type(__c, eof()) ? __c : to_int_type(char_type()); }
    };

template<typename _CharT>
    int
    char_traits<_CharT>::
    compare(const char_type* __s1, const char_type* __s2, std::size_t __n)
    {
      for (std::size_t __i = 0; __i < __n; ++__i)
	if (lt(__s1[__i], __s2[__i]))
	  return -1;
	else if (lt(__s2[__i], __s1[__i]))
	  return 1;
      return 0;
    }

template<typename _CharT>
    std::size_t
    char_traits<_CharT>::
    length(const char_type* __p)
    {
      std::size_t __i = 0;
      while (!eq(__p[__i], char_type()))
        ++__i;
      return __i;
    }

template<typename _CharT>
    const typename char_traits<_CharT>::char_type*
    char_traits<_CharT>::
    find(const char_type* __s, std::size_t __n, const char_type& __a)
    {
      for (std::size_t __i = 0; __i < __n; ++__i)
        if (eq(__s[__i], __a))
          return __s + __i;
      return 0;
    }

template<typename _CharT>
    typename char_traits<_CharT>::char_type*
    char_traits<_CharT>::
    move(char_type* __s1, const char_type* __s2, std::size_t __n)
    {
      return static_cast<_CharT*>(__builtin_memmove(__s1, __s2,
						    __n * sizeof(char_type)));
    }

template<typename _CharT>
    typename char_traits<_CharT>::char_type*
    char_traits<_CharT>::
    copy(char_type* __s1, const char_type* __s2, std::size_t __n)
    {
      // NB: Inline std::copy so no recursive dependencies.
      std::copy(__s2, __s2 + __n, __s1);
      return __s1;
    }

template<typename _CharT>
    typename char_traits<_CharT>::char_type*
    char_traits<_CharT>::
    assign(char_type* __s, std::size_t __n, char_type __a)
    {
      // NB: Inline std::fill_n so no recursive dependencies.
      std::fill_n(__s, __n, __a);
      return __s;
    }

_GLIBCXX_END_NAMESPACE

_GLIBCXX_BEGIN_NAMESPACE(std)

// 21.1
  /**
   *  @brief  Basis for explicit traits specializations.
   *
   *  @note  For any given actual character type, this definition is
   *  probably wrong.  Since this is just a thin wrapper around
   *  __gnu_cxx::char_traits, it is possible to achieve a more
   *  appropriate definition by specializing __gnu_cxx::char_traits.
   *
   *  See http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt05ch13s03.html
   *  for advice on how to make use of this class for "unusual" character
   *  types. Also, check out include/ext/pod_char_traits.h.
  */
  template<class _CharT>
    struct char_traits : public __gnu_cxx::char_traits<_CharT>
    { };

/// 21.1.3.1  char_traits specializations
  template<>
    struct char_traits<char>
    {
      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 __builtin_memcmp(__s1, __s2, __n); }

static size_t
      length(const char_type* __s)
      { return __builtin_strlen(__s); }

static const char_type*
      find(const char_type* __s, size_t __n, const char_type& __a)
      { return static_cast<const char_type*>(__builtin_memchr(__s, __a, __n)); }

static char_type*
      move(char_type* __s1, const char_type* __s2, size_t __n)
      { return static_cast<char_type*>(__builtin_memmove(__s1, __s2, __n)); }

static char_type*
      copy(char_type* __s1, const char_type* __s2, size_t __n)
      { return static_cast<char_type*>(__builtin_memcpy(__s1, __s2, __n)); }

static char_type*
      assign(char_type* __s, size_t __n, char_type __a)
      { return static_cast<char_type*>(__builtin_memset(__s, __a, __n)); }

static char_type
      to_char_type(const int_type& __c)
      { return static_cast<char_type>(__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<int_type>(static_cast<unsigned char>(__c)); }

static bool
      eq_int_type(const int_type& __c1, const int_type& __c2)
      { return __c1 == __c2; }

static int_type
      eof()
      { return static_cast<int_type>(_CHAR_TRAITS_EOF); }

static int_type
      not_eof(const int_type& __c)
      { return (__c == eof()) ? 0 : __c; }
  };

#ifdef _GLIBCXX_USE_WCHAR_T
  /// 21.1.3.2  char_traits specializations
  template<>
    struct char_traits<wchar_t>
    {
      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, size_t __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<int_type>(WEOF); }

static int_type
      not_eof(const int_type& __c)
      { return eq_int_type(__c, eof()) ? 0 : __c; }
  };
#endif //_GLIBCXX_USE_WCHAR_T

_GLIBCXX_END_NAMESPACE

#if (defined(__GXX_EXPERIMENTAL_CXX0X__) \
     && defined(_GLIBCXX_USE_C99_STDINT_TR1))

#include <cstdint>

_GLIBCXX_BEGIN_NAMESPACE(std)

template<>
    struct char_traits<char16_t>
    {
      typedef char16_t          char_type;
      typedef uint_least16_t    int_type;
      typedef streamoff         off_type;
      typedef u16streampos      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)
      {
	for (size_t __i = 0; __i < __n; ++__i)
	  if (lt(__s1[__i], __s2[__i]))
	    return -1;
	  else if (lt(__s2[__i], __s1[__i]))
	    return 1;
	return 0;
      }

static size_t
      length(const char_type* __s)
      {
	size_t __i = 0;
	while (!eq(__s[__i], char_type()))
	  ++__i;
	return __i;
      }

static const char_type*
      find(const char_type* __s, size_t __n, const char_type& __a)
      {
	for (size_t __i = 0; __i < __n; ++__i)
	  if (eq(__s[__i], __a))
	    return __s + __i;
	return 0;
      }

static char_type*
      move(char_type* __s1, const char_type* __s2, size_t __n)
      {
	return (static_cast<char_type*>
		(__builtin_memmove(__s1, __s2, __n * sizeof(char_type))));
      }

static char_type*
      copy(char_type* __s1, const char_type* __s2, size_t __n)
      {
	return (static_cast<char_type*>
		(__builtin_memcpy(__s1, __s2, __n * sizeof(char_type))));
      }

static char_type*
      assign(char_type* __s, size_t __n, char_type __a)
      {
	for (size_t __i = 0; __i < __n; ++__i)
	  assign(__s[__i], __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<int_type>(-1); }

static int_type
      not_eof(const int_type& __c)
      { return eq_int_type(__c, eof()) ? 0 : __c; }
    };

template<>
    struct char_traits<char32_t>
    {
      typedef char32_t          char_type;
      typedef uint_least32_t    int_type;
      typedef streamoff         off_type;
      typedef u32streampos      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 size_t
      length(const char_type* __s)
      {
	size_t __i = 0;
	while (!eq(__s[__i], char_type()))
	  ++__i;
	return __i;
      }

static char_type*
      move(char_type* __s1, const char_type* __s2, size_t __n)
      {
	return (static_cast<char_type*>
		(__builtin_memmove(__s1, __s2, __n * sizeof(char_type))));
      }

static char_type*
      copy(char_type* __s1, const char_type* __s2, size_t __n)
      { 
	return (static_cast<char_type*>
		(__builtin_memcpy(__s1, __s2, __n * sizeof(char_type))));
      }

static char_type*
      assign(char_type* __s, size_t __n, char_type __a)
      {
	for (size_t __i = 0; __i < __n; ++__i)
	  assign(__s[__i], __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<int_type>(-1); }

static int_type
      not_eof(const int_type& __c)
      { return eq_int_type(__c, eof()) ? 0 : __c; }
    };

_GLIBCXX_END_NAMESPACE

#endif

#undef _CHAR_TRAITS_EOF

#endif // _CHAR_TRAITS_H

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