monetary_members.cc

gcc-you can use this code to learn something about gcc, and inquire further into linux,

// std::moneypunct implementation details, GNU version -*- C++ -*-

// Copyright (C) 2001, 2002 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: 22.2.6.3.2  moneypunct virtual functions
//

// Written by Benjamin Kosnik <[e-mail]>

#include <locale>
#include <bits/c++locale_internal.h>

namespace std
{
  // Construct and return valid pattern consisting of some combination of:
  // space none symbol sign value
  money_base::pattern
  money_base::_S_construct_pattern(char __precedes, char __space, char __posn)
  { 
    pattern __ret;

    // This insanely complicated routine attempts to construct a valid
    // pattern for use with monyepunct. A couple of invariants:

    // if (__precedes) symbol -> value
    // else value -> symbol
    
    // if (__space) space
    // else none

    // none == never first
    // space never first or last

    // Any elegant implementations of this are welcome.
    switch (__posn)
      {
      case 0:
      case 1:
	// 1 The sign precedes the value and symbol.
	if (__space)
	  {
	    // Pattern starts with sign.
	    if (__precedes)
	      {
		__ret.field[1] = symbol;
		__ret.field[2] = space;
		__ret.field[3] = value;
	      }
	    else
	      {
		__ret.field[1] = value;
		__ret.field[2] = space;
		__ret.field[3] = symbol;
	      }
	    __ret.field[0] = sign;
	  }
	else
	  {
	    // Pattern starts with sign and ends with none.
	    if (__precedes)
	      {
		__ret.field[1] = symbol;
		__ret.field[2] = value;
	      }
	    else
	      {
		__ret.field[1] = value;
		__ret.field[2] = symbol;
	      }
	    __ret.field[0] = sign;
	    __ret.field[3] = none;
	  }
	break;
      case 2:
	// 2 The sign follows the value and symbol.
	if (__space)
	  {
	    // Pattern either ends with sign.
	    if (__precedes)
	      {
		__ret.field[0] = symbol;
		__ret.field[1] = space;
		__ret.field[2] = value;
	      }
	    else
	      {
		__ret.field[0] = value;
		__ret.field[1] = space;
		__ret.field[2] = symbol;
	      }
	    __ret.field[3] = sign;
	  }
	else
	  {
	    // Pattern ends with sign then none.
	    if (__precedes)
	      {
		__ret.field[0] = symbol;
		__ret.field[1] = value;
	      }
	    else
	      {
		__ret.field[0] = value;
		__ret.field[1] = symbol;
	      }
	    __ret.field[2] = sign;
	    __ret.field[3] = none;
	  }
	break;
      case 3:
	// 3 The sign immediately precedes the symbol.
	if (__space)
	  {
	    // Have space.
	    if (__precedes)
	      {
		__ret.field[0] = sign;
		__ret.field[1] = symbol;
		__ret.field[2] = space;
		__ret.field[3] = value;
	      }
	    else
	      {
		__ret.field[0] = value;
		__ret.field[1] = space;
		__ret.field[2] = sign;
		__ret.field[3] = symbol;
	      }
	  }
	else
	  {
	    // Have none.
	    if (__precedes)
	      {
		__ret.field[0] = sign;
		__ret.field[1] = symbol;
		__ret.field[2] = value;
	      }
	    else
	      {
		__ret.field[0] = value;
		__ret.field[1] = sign;
		__ret.field[2] = symbol;
	      }
	    __ret.field[3] = none;
	  }
	break;
      case 4:
	// 4 The sign immediately follows the symbol. 
	if (__space)
	  {
	    // Have space.
	    if (__precedes)
	      {
		__ret.field[0] = symbol;
		__ret.field[1] = sign;
		__ret.field[2] = space;
		__ret.field[3] = value;
	      }
	    else
	      {
		__ret.field[0] = value;
		__ret.field[1] = space;
		__ret.field[2] = symbol;
		__ret.field[3] = sign;
	      }
	  }
	else
	  {
	    // Have none.
	    if (__precedes)
	      {
		__ret.field[0] = symbol;
		__ret.field[1] = sign;
		__ret.field[2] = value;
	      }
	    else
	      {
		__ret.field[0] = value;
		__ret.field[1] = symbol;
		__ret.field[2] = sign;
	      }
	    __ret.field[3] = none;
	  }
	break;
      default:
	;
      }
    return __ret;
  }

  template<> 
    void
    moneypunct<char, true>::_M_initialize_moneypunct(__c_locale __cloc, 
						     const char*)
    {
      if (!__cloc)
	{
	  // "C" locale
	  _M_decimal_point = '.';
	  _M_thousands_sep = ',';
	  _M_grouping = "";
	  _M_curr_symbol = "";
	  _M_positive_sign = "";
	  _M_negative_sign = "";
	  _M_frac_digits = 0;
	  _M_pos_format = money_base::_S_default_pattern;
	  _M_neg_format = money_base::_S_default_pattern;
	}
      else
	{
	  // Named locale.
	  _M_decimal_point = *(__nl_langinfo_l(__MON_DECIMAL_POINT, __cloc));
	  _M_thousands_sep = *(__nl_langinfo_l(__MON_THOUSANDS_SEP, __cloc));
	  _M_grouping = __nl_langinfo_l(__MON_GROUPING, __cloc);
	  _M_positive_sign = __nl_langinfo_l(__POSITIVE_SIGN, __cloc);

	  char __nposn = *(__nl_langinfo_l(__INT_N_SIGN_POSN, __cloc));
	  if (!__nposn)
	    _M_negative_sign = "()";
	  else
	    _M_negative_sign = __nl_langinfo_l(__NEGATIVE_SIGN, __cloc);

	  // _Intl == true
	  _M_curr_symbol = __nl_langinfo_l(__INT_CURR_SYMBOL, __cloc);
	  _M_frac_digits = *(__nl_langinfo_l(__INT_FRAC_DIGITS, __cloc));
	  char __pprecedes = *(__nl_langinfo_l(__INT_P_CS_PRECEDES, __cloc));
	  char __pspace = *(__nl_langinfo_l(__INT_P_SEP_BY_SPACE, __cloc));
	  char __pposn = *(__nl_langinfo_l(__INT_P_SIGN_POSN, __cloc));
	  _M_pos_format = _S_construct_pattern(__pprecedes, __pspace, __pposn);
	  char __nprecedes = *(__nl_langinfo_l(__INT_N_CS_PRECEDES, __cloc));
	  char __nspace = *(__nl_langinfo_l(__INT_N_SEP_BY_SPACE, __cloc));
	  _M_neg_format = _S_construct_pattern(__nprecedes, __nspace, __nposn);
	}
    }

  template<> 
    void
    moneypunct<char, false>::_M_initialize_moneypunct(__c_locale __cloc, 
						      const char*)
    {
      if (!__cloc)
	{
	  // "C" locale
	  _M_decimal_point = '.';
	  _M_thousands_sep = ',';
	  _M_grouping = "";
	  _M_curr_symbol = "";
	  _M_positive_sign = "";
	  _M_negative_sign = "";
	  _M_frac_digits = 0;
	  _M_pos_format = money_base::_S_default_pattern;
	  _M_neg_format = money_base::_S_default_pattern;
	}
      else
	{
	  // Named locale.
	  _M_decimal_point = *(__nl_langinfo_l(__MON_DECIMAL_POINT, __cloc));
	  _M_thousands_sep = *(__nl_langinfo_l(__MON_THOUSANDS_SEP, __cloc));
	  _M_grouping = __nl_langinfo_l(__MON_GROUPING, __cloc);
	  _M_positive_sign = __nl_langinfo_l(__POSITIVE_SIGN, __cloc);

	  char __nposn = *(__nl_langinfo_l(__N_SIGN_POSN, __cloc));
	  if (!__nposn)
	    _M_negative_sign = "()";
	  else
	    _M_negative_sign = __nl_langinfo_l(__NEGATIVE_SIGN, __cloc);

	  // _Intl == false
	  _M_curr_symbol = __nl_langinfo_l(__CURRENCY_SYMBOL, __cloc);
	  _M_frac_digits = *(__nl_langinfo_l(__FRAC_DIGITS, __cloc));
	  char __pprecedes = *(__nl_langinfo_l(__P_CS_PRECEDES, __cloc));
	  char __pspace = *(__nl_langinfo_l(__P_SEP_BY_SPACE, __cloc));
	  char __pposn = *(__nl_langinfo_l(__P_SIGN_POSN, __cloc));
	  _M_pos_format = _S_construct_pattern(__pprecedes, __pspace, __pposn);
	  char __nprecedes = *(__nl_langinfo_l(__N_CS_PRECEDES, __cloc));
	  char __nspace = *(__nl_langinfo_l(__N_SEP_BY_SPACE, __cloc));
	  _M_neg_format = _S_construct_pattern(__nprecedes, __nspace, __nposn);
	}
    }

  template<> 
    moneypunct<char, true>::~moneypunct()
    { }

  template<> 
    moneypunct<char, false>::~moneypunct()
    { }

#ifdef _GLIBCPP_USE_WCHAR_T
  template<> 
    void
    moneypunct<wchar_t, true>::_M_initialize_moneypunct(__c_locale __cloc, 
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
							const char*)
#else
							const char* __name)
#endif
    {
      if (!__cloc)
	{
	  // "C" locale
	  _M_decimal_point = L'.';
	  _M_thousands_sep = L',';
	  _M_grouping = "";
	  _M_curr_symbol = L"";
	  _M_positive_sign = L"";
	  _M_negative_sign = L"";
	  _M_frac_digits = 0;
	  _M_pos_format = money_base::_S_default_pattern;
	  _M_neg_format = money_base::_S_default_pattern;
	}
      else
	{
	  // Named locale.
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
	  __c_locale __old = __uselocale(__cloc);
#else
	  // Switch to named locale so that mbsrtowcs will work.
	  char* __old = strdup(setlocale(LC_ALL, NULL));
	  setlocale(LC_ALL, __name);
#endif

	  _M_decimal_point = static_cast<wchar_t>(((union { const char *__s; unsigned int __w; }){ __s: __nl_langinfo_l(_NL_NUMERIC_DECIMAL_POINT_WC, __cloc)}).__w);

	  _M_thousands_sep = static_cast<wchar_t>(((union { const char *__s; unsigned int __w; }){ __s: __nl_langinfo_l(_NL_NUMERIC_THOUSANDS_SEP_WC, __cloc)}).__w);
	  _M_grouping = __nl_langinfo_l(GROUPING, __cloc);

	  const char* __cpossign = __nl_langinfo_l(__POSITIVE_SIGN, __cloc);
	  const char* __cnegsign = __nl_langinfo_l(__NEGATIVE_SIGN, __cloc);
	  const char* __ccurr = __nl_langinfo_l(__INT_CURR_SYMBOL, __cloc);

	  mbstate_t __state;
	  size_t __len = strlen(__cpossign);
	  if (__len)
	    {
	      ++__len;
	      memset(&__state, 0, sizeof(mbstate_t));
	      wchar_t* __wcs = new wchar_t[__len];
	      mbsrtowcs(__wcs, &__cpossign, __len, &__state);
	      _M_positive_sign = __wcs;
	    }
	  else
	    _M_positive_sign = L"";

	  char __nposn = *(__nl_langinfo_l(__INT_N_SIGN_POSN, __cloc));
	  __len = strlen(__cnegsign);
	  if (!__nposn)
	    _M_negative_sign = L"()";
	  else if (__len)
	    { 
	      ++__len;
	      memset(&__state, 0, sizeof(mbstate_t));
	      wchar_t* __wcs = new wchar_t[__len];
	      mbsrtowcs(__wcs, &__cnegsign, __len, &__state);
	      _M_negative_sign = __wcs;
	    }
	  else
	    _M_negative_sign = L"";

	  // _Intl == true.
	  __len = strlen(__ccurr);
	  if (__len)
	    {
	      ++__len;
	      memset(&__state, 0, sizeof(mbstate_t));
	      wchar_t* __wcs = new wchar_t[__len];
	      mbsrtowcs(__wcs, &__ccurr, __len, &__state);
	      _M_curr_symbol = __wcs;
	    }
	  else
	    _M_curr_symbol = L"";

	  _M_frac_digits = *(__nl_langinfo_l(__INT_FRAC_DIGITS, __cloc));
	  char __pprecedes = *(__nl_langinfo_l(__INT_P_CS_PRECEDES, __cloc));
	  char __pspace = *(__nl_langinfo_l(__INT_P_SEP_BY_SPACE, __cloc));
	  char __pposn = *(__nl_langinfo_l(__INT_P_SIGN_POSN, __cloc));
	  _M_pos_format = _S_construct_pattern(__pprecedes, __pspace, __pposn);
	  char __nprecedes = *(__nl_langinfo_l(__INT_N_CS_PRECEDES, __cloc));
	  char __nspace = *(__nl_langinfo_l(__INT_N_SEP_BY_SPACE, __cloc));
	  _M_neg_format = _S_construct_pattern(__nprecedes, __nspace, __nposn);

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
	  __uselocale(__old);
#else
	  setlocale(LC_ALL, __old);
	  free(__old);
#endif
	}
    }

  template<> 
    void
    moneypunct<wchar_t, false>::_M_initialize_moneypunct(__c_locale __cloc,
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) 
							 const char*)
#else
							 const char* __name)
#endif
    {
      if (!__cloc)
	{
	  // "C" locale
	  _M_decimal_point = L'.';
	  _M_thousands_sep = L',';
	  _M_grouping = "";
	  _M_curr_symbol = L"";
	  _M_positive_sign = L"";
	  _M_negative_sign = L"";
	  _M_frac_digits = 0;
	  _M_pos_format = money_base::_S_default_pattern;
	  _M_neg_format = money_base::_S_default_pattern;
	}
      else
	{
	  // Named locale.
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
	  __c_locale __old = __uselocale(__cloc);
#else
	  // Switch to named locale so that mbsrtowcs will work.
	  char* __old = strdup(setlocale(LC_ALL, NULL));
	  setlocale(LC_ALL, __name);
#endif

	  _M_decimal_point = static_cast<wchar_t>(((union { const char *__s; unsigned int __w; }){ __s: __nl_langinfo_l(_NL_NUMERIC_DECIMAL_POINT_WC, __cloc)}).__w);
	  _M_thousands_sep = static_cast<wchar_t>(((union { const char *__s; unsigned int __w; }){ __s: __nl_langinfo_l(_NL_NUMERIC_THOUSANDS_SEP_WC, __cloc)}).__w);
	  _M_grouping = __nl_langinfo_l(GROUPING, __cloc);

	  const char* __cpossign = __nl_langinfo_l(__POSITIVE_SIGN, __cloc);
	  const char* __cnegsign = __nl_langinfo_l(__NEGATIVE_SIGN, __cloc);
	  const char* __ccurr = __nl_langinfo_l(__CURRENCY_SYMBOL, __cloc);

	  mbstate_t __state;
	  size_t __len;
	  __len = strlen(__cpossign);
	  if (__len)
	    {
	      ++__len;
	      memset(&__state, 0, sizeof(mbstate_t));
	      wchar_t* __wcs = new wchar_t[__len];
	      mbsrtowcs(__wcs, &__cpossign, __len, &__state);
	      _M_positive_sign = __wcs;
	    }
	  else
	    _M_positive_sign = L"";

	  char __nposn = *(__nl_langinfo_l(__N_SIGN_POSN, __cloc));
	  __len = strlen(__cnegsign);
	  if (!__nposn)
	    _M_negative_sign = L"()";
	  else if (__len)
	    { 
	      ++__len;
	      memset(&__state, 0, sizeof(mbstate_t));
	      wchar_t* __wcs = new wchar_t[__len];
	      mbsrtowcs(__wcs, &__cnegsign, __len, &__state);
	      _M_negative_sign = __wcs;
	    }
	  else
	    _M_negative_sign = L"";

	  // _Intl == true.
	  __len = strlen(__ccurr);
	  if (__len)
	    {
	      ++__len;
	      memset(&__state, 0, sizeof(mbstate_t));
	      wchar_t* __wcs = new wchar_t[__len];
	      mbsrtowcs(__wcs, &__ccurr, __len, &__state);
	      _M_curr_symbol = __wcs;
	    }
	  else
	    _M_curr_symbol = L"";

	  _M_frac_digits = *(__nl_langinfo_l(__FRAC_DIGITS, __cloc));
	  char __pprecedes = *(__nl_langinfo_l(__P_CS_PRECEDES, __cloc));
	  char __pspace = *(__nl_langinfo_l(__P_SEP_BY_SPACE, __cloc));
	  char __pposn = *(__nl_langinfo_l(__P_SIGN_POSN, __cloc));
	  _M_pos_format = _S_construct_pattern(__pprecedes, __pspace, __pposn);
	  char __nprecedes = *(__nl_langinfo_l(__N_CS_PRECEDES, __cloc));
	  char __nspace = *(__nl_langinfo_l(__N_SEP_BY_SPACE, __cloc));
	  _M_neg_format = _S_construct_pattern(__nprecedes, __nspace, __nposn);

#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2)
	  __uselocale(__old);
#else
	  setlocale(LC_ALL, __old);
	  free(__old);
#endif
	}
    }

  template<> 
    moneypunct<wchar_t, true>::~moneypunct()
    {
      if (wcslen(_M_positive_sign))
	delete [] _M_positive_sign;
      if (wcslen(_M_negative_sign) && (wcscmp(_M_negative_sign, L"()") != 0))
	delete [] _M_negative_sign;
      if (wcslen(_M_curr_symbol))
	delete [] _M_curr_symbol;
    }

  template<> 
    moneypunct<wchar_t, false>::~moneypunct()
    {
      if (wcslen(_M_positive_sign))
	delete [] _M_positive_sign;
      if (wcslen(_M_negative_sign) && (wcscmp(_M_negative_sign, L"()") != 0))
	delete [] _M_negative_sign;
      if (wcslen(_M_curr_symbol))
	delete [] _M_curr_symbol;
    }
#endif
}