_num_get.c

来自「stl的源码」· C语言 代码 · 共 624 行 · 第 1/2 页

bool _STLP_CALL
__copy_digits(_InputIter& __first, _InputIter __last,
              __iostring& __v, const _CharT* __digits) {
  bool __ok = false;

  for ( ; __first != __last; ++__first) {
    _CharT __c = *__first;
    if (__get_fdigit(__c, __digits)) {
      __v.push_back((char)__c);
      __ok = true;
    }
    else
      break;
  }
  return __ok;
}

template <class _InputIter, class _CharT>
bool _STLP_CALL
__copy_grouped_digits(_InputIter& __first, _InputIter __last,
                      __iostring& __v, const _CharT * __digits,
                      _CharT __sep, const string& __grouping,
                      bool& __grouping_ok) {
  bool __ok = false;
  char __group_sizes[64];
  char*__group_sizes_end = __group_sizes;
  char __current_group_size = 0;

  for ( ; __first != __last; ++__first) {
    _CharT __c = *__first;
    bool __tmp = __get_fdigit_or_sep(__c, __sep, __digits);
    if (__tmp) {
      if (__c == ',') {
        *__group_sizes_end++ = __current_group_size;
        __current_group_size = 0;
      }
      else {
        __ok = true;
        __v.push_back((char)__c);
        ++__current_group_size;
      }
    }
    else
      break;
  }

  if (__group_sizes_end != __group_sizes)
    *__group_sizes_end++ = __current_group_size;
  __grouping_ok = __valid_grouping(__group_sizes, __group_sizes_end, __grouping.data(), __grouping.data() + __grouping.size());
  return __ok;
}


template <class _InputIter, class _CharT>
bool _STLP_CALL
__read_float(__iostring& __buf, _InputIter& __in_ite, _InputIter& __end,
             const ctype<_CharT> &__ct, const numpunct<_CharT> &__numpunct) {
  // Create a string, copying characters of the form
  // [+-]? [0-9]* .? [0-9]* ([eE] [+-]? [0-9]+)?

  string __grouping = __numpunct.grouping();
  bool __digits_before_dot /* = false */;
  bool __digits_after_dot = false;
  bool __ok;

  bool   __grouping_ok = true;

  _CharT __dot = __numpunct.decimal_point();
  _CharT __sep = __numpunct.thousands_sep();

  _CharT __digits[10];
  _CharT __xplus;
  _CharT __xminus;

  _CharT __pow_e;
  _CharT __pow_E;

  _Initialize_get_float(__ct, __xplus, __xminus, __pow_e, __pow_E, __digits);

  // Get an optional sign
  __in_ite = __copy_sign(__in_ite, __end, __buf, __xplus, __xminus);

  // Get an optional string of digits.
  if (!__grouping.empty())
    __digits_before_dot = __copy_grouped_digits(__in_ite, __end, __buf, __digits,
                                                __sep, __grouping, __grouping_ok);
  else
    __digits_before_dot = __copy_digits(__in_ite, __end, __buf, __digits);

  // Get an optional decimal point, and an optional string of digits.
  if (__in_ite != __end && *__in_ite == __dot) {
    __buf.push_back('.');
    ++__in_ite;
    __digits_after_dot = __copy_digits(__in_ite, __end, __buf, __digits);
  }

  // There have to be some digits, somewhere.
  __ok = __digits_before_dot || __digits_after_dot;

  // Get an optional exponent.
  if (__ok && __in_ite != __end && (*__in_ite == __pow_e || *__in_ite == __pow_E)) {
    __buf.push_back('e');
    ++__in_ite;
    __in_ite = __copy_sign(__in_ite, __end, __buf, __xplus, __xminus);
    __ok = __copy_digits(__in_ite, __end, __buf, __digits);
    // If we have an exponent then the sign
    // is optional but the digits aren't.
  }

  return __ok;
}

template <class _InputIter, class _Float, class _CharT>
_InputIter _STLP_CALL
__do_get_float(_InputIter& __in_ite, _InputIter& __end, ios_base& __str,
               ios_base::iostate& __err, _Float& __val, _CharT* /*__pc*/) {
  locale __loc = __str.getloc();
  const ctype<_CharT> &__ctype = use_facet<ctype<_CharT> >(__loc);
  const numpunct<_CharT> &__numpunct = use_facet<numpunct<_CharT> >(__loc);

  __iostring __buf ;
  bool __ok = __read_float(__buf, __in_ite, __end, __ctype, __numpunct);
  if (__ok) {
    __string_to_float(__buf, __val);
    __err = ios_base::goodbit;
  }
  else {
    __err = ios_base::failbit;
  }
  if (__in_ite == __end)
    __err |= ios_base::eofbit;
  return __in_ite;
}

template <class _InputIter, class _CharT>
_InputIter _STLP_CALL
__do_get_alphabool(_InputIter& __in_ite, _InputIter& __end, ios_base& __str,
                   ios_base::iostate& __err, bool& __x, _CharT* /*__pc*/) {
  const numpunct<_CharT>& __np = use_facet<numpunct<_CharT> >(__str.getloc());
  const basic_string<_CharT, char_traits<_CharT>, allocator<_CharT> > __truename  = __np.truename();
  const basic_string<_CharT, char_traits<_CharT>, allocator<_CharT> > __falsename = __np.falsename();
  bool __true_ok  = true;
  bool __false_ok = true;

  size_t __n = 0;
  for ( ; __in_ite != __end; ++__in_ite) {
    _CharT __c = *__in_ite;
    __true_ok  = __true_ok  && (__c == __truename[__n]);
    __false_ok = __false_ok && (__c == __falsename[__n]);
    ++__n;

    if ((!__true_ok && !__false_ok) ||
        (__true_ok  && __n >= __truename.size()) ||
        (__false_ok && __n >= __falsename.size())) {
      ++__in_ite;
      break;
    }
  }
  if (__true_ok  && __n < __truename.size())  __true_ok  = false;
  if (__false_ok && __n < __falsename.size()) __false_ok = false;

  if (__true_ok || __false_ok) {
    __err = ios_base::goodbit;
    __x = __true_ok;
  }
  else
    __err = ios_base::failbit;

  if (__in_ite == __end)
    __err |= ios_base::eofbit;

  return __in_ite;
}

_STLP_MOVE_TO_STD_NAMESPACE

//
// num_get<>, num_put<>
//

template <class _CharT, class _InputIterator>
locale::id num_get<_CharT, _InputIterator>::id;

#if !defined (_STLP_NO_BOOL)
template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end,
                                    ios_base& __s, ios_base::iostate& __err, bool& __x) const {
  if (__s.flags() & ios_base::boolalpha) {
    return _STLP_PRIV __do_get_alphabool(__in_ite, __end, __s, __err, __x, (_CharT*)0);
  }
  else {
    long __lx;
    _InputIter __tmp = _STLP_PRIV __do_get_integer(__in_ite, __end, __s, __err, __lx, (_CharT*)0 );
    if (!(__err & ios_base::failbit)) {
      if (__lx == 0)
        __x = false;
      else if (__lx == 1)
        __x = true;
      else
        __err |= ios_base::failbit;
    }
    return __tmp;
  }
}
#endif

#if defined (_STLP_FIX_LIBRARY_ISSUES)
template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err, short& __val) const
{ return _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err, int& __val) const
{ return _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

#endif

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err, long& __val) const
{ return _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    unsigned short& __val) const
{ return _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    unsigned int& __val) const
{ return _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    unsigned long& __val) const
{ return _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    float& __val) const
{ return _STLP_PRIV __do_get_float(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    double& __val) const
{ return _STLP_PRIV __do_get_float(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

#if !defined (_STLP_NO_LONG_DOUBLE)
template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    long double& __val) const
{ return _STLP_PRIV __do_get_float(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }
#endif

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    void*& __p) const {
#if defined (_STLP_LONG_LONG) && !defined (__MRC__)    //*ty 12/07/2001 - MrCpp can not cast from long long to void*
  unsigned _STLP_LONG_LONG __val;
#else
  unsigned long __val;
#endif
  iter_type __tmp = _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 );
  if (!(__err & ios_base::failbit))
    __p = __REINTERPRET_CAST(void*, __val);
  return __tmp;
}

#if defined (_STLP_LONG_LONG)
template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    _STLP_LONG_LONG& __val) const
{ return _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }

template <class _CharT, class _InputIter>
_InputIter
num_get<_CharT, _InputIter>::do_get(_InputIter __in_ite, _InputIter __end, ios_base& __str,
                                    ios_base::iostate& __err,
                                    unsigned _STLP_LONG_LONG& __val) const
{ return _STLP_PRIV __do_get_integer(__in_ite, __end, __str, __err, __val, (_CharT*)0 ); }
#endif

_STLP_END_NAMESPACE

#endif /* _STLP_NUMERIC_FACETS_C */

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// mode:C++
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