--- /dev/null
+// String based streams -*- C++ -*-
+
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+// 2006, 2008, 2009, 2010, 2011 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 include/sstream
+ * This is a Standard C++ Library header.
+ */
+
+//
+// ISO C++ 14882: 27.7 String-based streams
+//
+
+#ifndef _GLIBCXX_SSTREAM
+#define _GLIBCXX_SSTREAM 1
+
+#pragma GCC system_header
+
+#include <istream>
+#include <ostream>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ // [27.7.1] template class basic_stringbuf
+ /**
+ * @brief The actual work of input and output (for std::string).
+ * @ingroup io
+ *
+ * This class associates either or both of its input and output sequences
+ * with a sequence of characters, which can be initialized from, or made
+ * available as, a @c std::basic_string. (Paraphrased from [27.7.1]/1.)
+ *
+ * For this class, open modes (of type @c ios_base::openmode) have
+ * @c in set if the input sequence can be read, and @c out set if the
+ * output sequence can be written.
+ */
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
+ {
+ public:
+ // Types:
+ typedef _CharT char_type;
+ typedef _Traits traits_type;
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 251. basic_stringbuf missing allocator_type
+ typedef _Alloc allocator_type;
+ typedef typename traits_type::int_type int_type;
+ typedef typename traits_type::pos_type pos_type;
+ typedef typename traits_type::off_type off_type;
+
+ typedef basic_streambuf<char_type, traits_type> __streambuf_type;
+ typedef basic_string<char_type, _Traits, _Alloc> __string_type;
+ typedef typename __string_type::size_type __size_type;
+
+ protected:
+ /// Place to stash in || out || in | out settings for current stringbuf.
+ ios_base::openmode _M_mode;
+
+ // Data Members:
+ __string_type _M_string;
+
+ public:
+ // Constructors:
+ /**
+ * @brief Starts with an empty string buffer.
+ * @param __mode Whether the buffer can read, or write, or both.
+ *
+ * The default constructor initializes the parent class using its
+ * own default ctor.
+ */
+ explicit
+ basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)
+ : __streambuf_type(), _M_mode(__mode), _M_string()
+ { }
+
+ /**
+ * @brief Starts with an existing string buffer.
+ * @param __str A string to copy as a starting buffer.
+ * @param __mode Whether the buffer can read, or write, or both.
+ *
+ * This constructor initializes the parent class using its
+ * own default ctor.
+ */
+ explicit
+ basic_stringbuf(const __string_type& __str,
+ ios_base::openmode __mode = ios_base::in | ios_base::out)
+ : __streambuf_type(), _M_mode(), _M_string(__str.data(), __str.size())
+ { _M_stringbuf_init(__mode); }
+
+ // Get and set:
+ /**
+ * @brief Copying out the string buffer.
+ * @return A copy of one of the underlying sequences.
+ *
+ * <em>If the buffer is only created in input mode, the underlying
+ * character sequence is equal to the input sequence; otherwise, it
+ * is equal to the output sequence.</em> [27.7.1.2]/1
+ */
+ __string_type
+ str() const
+ {
+ __string_type __ret;
+ if (this->pptr())
+ {
+ // The current egptr() may not be the actual string end.
+ if (this->pptr() > this->egptr())
+ __ret = __string_type(this->pbase(), this->pptr());
+ else
+ __ret = __string_type(this->pbase(), this->egptr());
+ }
+ else
+ __ret = _M_string;
+ return __ret;
+ }
+
+ /**
+ * @brief Setting a new buffer.
+ * @param __s The string to use as a new sequence.
+ *
+ * Deallocates any previous stored sequence, then copies @a s to
+ * use as a new one.
+ */
+ void
+ str(const __string_type& __s)
+ {
+ // Cannot use _M_string = __s, since v3 strings are COW.
+ _M_string.assign(__s.data(), __s.size());
+ _M_stringbuf_init(_M_mode);
+ }
+
+ protected:
+ // Common initialization code goes here.
+ void
+ _M_stringbuf_init(ios_base::openmode __mode)
+ {
+ _M_mode = __mode;
+ __size_type __len = 0;
+ if (_M_mode & (ios_base::ate | ios_base::app))
+ __len = _M_string.size();
+ _M_sync(const_cast<char_type*>(_M_string.data()), 0, __len);
+ }
+
+ virtual streamsize
+ showmanyc()
+ {
+ streamsize __ret = -1;
+ if (_M_mode & ios_base::in)
+ {
+ _M_update_egptr();
+ __ret = this->egptr() - this->gptr();
+ }
+ return __ret;
+ }
+
+ virtual int_type
+ underflow();
+
+ virtual int_type
+ pbackfail(int_type __c = traits_type::eof());
+
+ virtual int_type
+ overflow(int_type __c = traits_type::eof());
+
+ /**
+ * @brief Manipulates the buffer.
+ * @param __s Pointer to a buffer area.
+ * @param __n Size of @a __s.
+ * @return @c this
+ *
+ * If no buffer has already been created, and both @a __s and @a __n are
+ * non-zero, then @c __s is used as a buffer; see
+ * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html
+ * for more.
+ */
+ virtual __streambuf_type*
+ setbuf(char_type* __s, streamsize __n)
+ {
+ if (__s && __n >= 0)
+ {
+ // This is implementation-defined behavior, and assumes
+ // that an external char_type array of length __n exists
+ // and has been pre-allocated. If this is not the case,
+ // things will quickly blow up.
+
+ // Step 1: Destroy the current internal array.
+ _M_string.clear();
+
+ // Step 2: Use the external array.
+ _M_sync(__s, __n, 0);
+ }
+ return this;
+ }
+
+ virtual pos_type
+ seekoff(off_type __off, ios_base::seekdir __way,
+ ios_base::openmode __mode = ios_base::in | ios_base::out);
+
+ virtual pos_type
+ seekpos(pos_type __sp,
+ ios_base::openmode __mode = ios_base::in | ios_base::out);
+
+ // Internal function for correctly updating the internal buffer
+ // for a particular _M_string, due to initialization or re-sizing
+ // of an existing _M_string.
+ void
+ _M_sync(char_type* __base, __size_type __i, __size_type __o);
+
+ // Internal function for correctly updating egptr() to the actual
+ // string end.
+ void
+ _M_update_egptr()
+ {
+ const bool __testin = _M_mode & ios_base::in;
+ if (this->pptr() && this->pptr() > this->egptr())
+ {
+ if (__testin)
+ this->setg(this->eback(), this->gptr(), this->pptr());
+ else
+ this->setg(this->pptr(), this->pptr(), this->pptr());
+ }
+ }
+
+ // Works around the issue with pbump, part of the protected
+ // interface of basic_streambuf, taking just an int.
+ void
+ _M_pbump(char_type* __pbeg, char_type* __pend, off_type __off);
+ };
+
+
+ // [27.7.2] Template class basic_istringstream
+ /**
+ * @brief Controlling input for std::string.
+ * @ingroup io
+ *
+ * This class supports reading from objects of type std::basic_string,
+ * using the inherited functions from std::basic_istream. To control
+ * the associated sequence, an instance of std::basic_stringbuf is used,
+ * which this page refers to as @c sb.
+ */
+ template<typename _CharT, typename _Traits, typename _Alloc>
+ class basic_istringstream : public basic_istream<_CharT, _Traits>
+ {
+ public:
+ // Types:
+ typedef _CharT char_type;
+ typedef _Traits traits_type;
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 251. basic_stringbuf missing allocator_type
+ typedef _Alloc allocator_type;
+ typedef typename traits_type::int_type int_type;
+ typedef typename traits_type::pos_type pos_type;
+ typedef typename traits_type::off_type off_type;
+
+ // Non-standard types:
+ typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
+ typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
+ typedef basic_istream<char_type, traits_type> __istream_type;
+
+ private:
+ __stringbuf_type _M_stringbuf;
+
+ public:
+ // Constructors:
+ /**
+ * @brief Default constructor starts with an empty string buffer.
+ * @param __mode Whether the buffer can read, or write, or both.
+ *
+ * @c ios_base::in is automatically included in @a __mode.
+ *
+ * Initializes @c sb using @c __mode|in, and passes @c &sb to the base
+ * class initializer. Does not allocate any buffer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ explicit
+ basic_istringstream(ios_base::openmode __mode = ios_base::in)
+ : __istream_type(), _M_stringbuf(__mode | ios_base::in)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief Starts with an existing string buffer.
+ * @param __str A string to copy as a starting buffer.
+ * @param __mode Whether the buffer can read, or write, or both.
+ *
+ * @c ios_base::in is automatically included in @a mode.
+ *
+ * Initializes @c sb using @a str and @c mode|in, and passes @c &sb
+ * to the base class initializer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ explicit
+ basic_istringstream(const __string_type& __str,
+ ios_base::openmode __mode = ios_base::in)
+ : __istream_type(), _M_stringbuf(__str, __mode | ios_base::in)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief The destructor does nothing.
+ *
+ * The buffer is deallocated by the stringbuf object, not the
+ * formatting stream.
+ */
+ ~basic_istringstream()
+ { }
+
+ // Members:
+ /**
+ * @brief Accessing the underlying buffer.
+ * @return The current basic_stringbuf buffer.
+ *
+ * This hides both signatures of std::basic_ios::rdbuf().
+ */
+ __stringbuf_type*
+ rdbuf() const
+ { return const_cast<__stringbuf_type*>(&_M_stringbuf); }
+
+ /**
+ * @brief Copying out the string buffer.
+ * @return @c rdbuf()->str()
+ */
+ __string_type
+ str() const
+ { return _M_stringbuf.str(); }
+
+ /**
+ * @brief Setting a new buffer.
+ * @param __s The string to use as a new sequence.
+ *
+ * Calls @c rdbuf()->str(s).
+ */
+ void
+ str(const __string_type& __s)
+ { _M_stringbuf.str(__s); }
+ };
+
+
+ // [27.7.3] Template class basic_ostringstream
+ /**
+ * @brief Controlling output for std::string.
+ * @ingroup io
+ *
+ * This class supports writing to objects of type std::basic_string,
+ * using the inherited functions from std::basic_ostream. To control
+ * the associated sequence, an instance of std::basic_stringbuf is used,
+ * which this page refers to as @c sb.
+ */
+ template <typename _CharT, typename _Traits, typename _Alloc>
+ class basic_ostringstream : public basic_ostream<_CharT, _Traits>
+ {
+ public:
+ // Types:
+ typedef _CharT char_type;
+ typedef _Traits traits_type;
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 251. basic_stringbuf missing allocator_type
+ typedef _Alloc allocator_type;
+ typedef typename traits_type::int_type int_type;
+ typedef typename traits_type::pos_type pos_type;
+ typedef typename traits_type::off_type off_type;
+
+ // Non-standard types:
+ typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
+ typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
+ typedef basic_ostream<char_type, traits_type> __ostream_type;
+
+ private:
+ __stringbuf_type _M_stringbuf;
+
+ public:
+ // Constructors/destructor:
+ /**
+ * @brief Default constructor starts with an empty string buffer.
+ * @param __mode Whether the buffer can read, or write, or both.
+ *
+ * @c ios_base::out is automatically included in @a mode.
+ *
+ * Initializes @c sb using @c mode|out, and passes @c &sb to the base
+ * class initializer. Does not allocate any buffer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ explicit
+ basic_ostringstream(ios_base::openmode __mode = ios_base::out)
+ : __ostream_type(), _M_stringbuf(__mode | ios_base::out)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief Starts with an existing string buffer.
+ * @param __str A string to copy as a starting buffer.
+ * @param __mode Whether the buffer can read, or write, or both.
+ *
+ * @c ios_base::out is automatically included in @a mode.
+ *
+ * Initializes @c sb using @a str and @c mode|out, and passes @c &sb
+ * to the base class initializer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ explicit
+ basic_ostringstream(const __string_type& __str,
+ ios_base::openmode __mode = ios_base::out)
+ : __ostream_type(), _M_stringbuf(__str, __mode | ios_base::out)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief The destructor does nothing.
+ *
+ * The buffer is deallocated by the stringbuf object, not the
+ * formatting stream.
+ */
+ ~basic_ostringstream()
+ { }
+
+ // Members:
+ /**
+ * @brief Accessing the underlying buffer.
+ * @return The current basic_stringbuf buffer.
+ *
+ * This hides both signatures of std::basic_ios::rdbuf().
+ */
+ __stringbuf_type*
+ rdbuf() const
+ { return const_cast<__stringbuf_type*>(&_M_stringbuf); }
+
+ /**
+ * @brief Copying out the string buffer.
+ * @return @c rdbuf()->str()
+ */
+ __string_type
+ str() const
+ { return _M_stringbuf.str(); }
+
+ /**
+ * @brief Setting a new buffer.
+ * @param __s The string to use as a new sequence.
+ *
+ * Calls @c rdbuf()->str(s).
+ */
+ void
+ str(const __string_type& __s)
+ { _M_stringbuf.str(__s); }
+ };
+
+
+ // [27.7.4] Template class basic_stringstream
+ /**
+ * @brief Controlling input and output for std::string.
+ * @ingroup io
+ *
+ * This class supports reading from and writing to objects of type
+ * std::basic_string, using the inherited functions from
+ * std::basic_iostream. To control the associated sequence, an instance
+ * of std::basic_stringbuf is used, which this page refers to as @c sb.
+ */
+ template <typename _CharT, typename _Traits, typename _Alloc>
+ class basic_stringstream : public basic_iostream<_CharT, _Traits>
+ {
+ public:
+ // Types:
+ typedef _CharT char_type;
+ typedef _Traits traits_type;
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 251. basic_stringbuf missing allocator_type
+ typedef _Alloc allocator_type;
+ typedef typename traits_type::int_type int_type;
+ typedef typename traits_type::pos_type pos_type;
+ typedef typename traits_type::off_type off_type;
+
+ // Non-standard Types:
+ typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
+ typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
+ typedef basic_iostream<char_type, traits_type> __iostream_type;
+
+ private:
+ __stringbuf_type _M_stringbuf;
+
+ public:
+ // Constructors/destructors
+ /**
+ * @brief Default constructor starts with an empty string buffer.
+ * @param __m Whether the buffer can read, or write, or both.
+ *
+ * Initializes @c sb using the mode from @c __m, and passes @c
+ * &sb to the base class initializer. Does not allocate any
+ * buffer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ explicit
+ basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
+ : __iostream_type(), _M_stringbuf(__m)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief Starts with an existing string buffer.
+ * @param __str A string to copy as a starting buffer.
+ * @param __m Whether the buffer can read, or write, or both.
+ *
+ * Initializes @c sb using @a __str and @c __m, and passes @c &sb
+ * to the base class initializer.
+ *
+ * That's a lie. We initialize the base class with NULL, because the
+ * string class does its own memory management.
+ */
+ explicit
+ basic_stringstream(const __string_type& __str,
+ ios_base::openmode __m = ios_base::out | ios_base::in)
+ : __iostream_type(), _M_stringbuf(__str, __m)
+ { this->init(&_M_stringbuf); }
+
+ /**
+ * @brief The destructor does nothing.
+ *
+ * The buffer is deallocated by the stringbuf object, not the
+ * formatting stream.
+ */
+ ~basic_stringstream()
+ { }
+
+ // Members:
+ /**
+ * @brief Accessing the underlying buffer.
+ * @return The current basic_stringbuf buffer.
+ *
+ * This hides both signatures of std::basic_ios::rdbuf().
+ */
+ __stringbuf_type*
+ rdbuf() const
+ { return const_cast<__stringbuf_type*>(&_M_stringbuf); }
+
+ /**
+ * @brief Copying out the string buffer.
+ * @return @c rdbuf()->str()
+ */
+ __string_type
+ str() const
+ { return _M_stringbuf.str(); }
+
+ /**
+ * @brief Setting a new buffer.
+ * @param __s The string to use as a new sequence.
+ *
+ * Calls @c rdbuf()->str(s).
+ */
+ void
+ str(const __string_type& __s)
+ { _M_stringbuf.str(__s); }
+ };
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#include <bits/sstream.tcc>
+
+#endif /* _GLIBCXX_SSTREAM */
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