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+// strstream definitions -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2005, 2009, 2010, 2011
+// Free Software Foundation
+//
+// 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/>.
+
+/*
+ * Copyright (c) 1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ */
+
+// Implementation of the classes in header <strstream>.
+// WARNING: The classes defined in <strstream> are DEPRECATED. This
+// header is defined in section D.7.1 of the C++ standard, and it
+// MAY BE REMOVED in a future standard revision. You should use the
+// header <sstream> instead.
+
+#include <strstream>
+#include <algorithm>
+#include <new>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ strstreambuf::strstreambuf(streamsize initial_capacity)
+ : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(true),
+ _M_frozen(false), _M_constant(false)
+ {
+ streamsize n = std::max(initial_capacity, streamsize(16));
+
+ char* buf = _M_alloc(n);
+ if (buf)
+ {
+ setp(buf, buf + n);
+ setg(buf, buf, buf);
+ }
+ }
+
+ strstreambuf::strstreambuf(void* (*alloc_f)(size_t), void (*free_f)(void*))
+ : _Base(), _M_alloc_fun(alloc_f), _M_free_fun(free_f), _M_dynamic(true),
+ _M_frozen(false), _M_constant(false)
+ {
+ streamsize n = 16;
+
+ char* buf = _M_alloc(n);
+ if (buf)
+ {
+ setp(buf, buf + n);
+ setg(buf, buf, buf);
+ }
+ }
+
+ strstreambuf::strstreambuf(char* get, streamsize n, char* put) throw ()
+ : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
+ _M_frozen(false), _M_constant(false)
+ { _M_setup(get, put, n); }
+
+ strstreambuf::strstreambuf(signed char* get, streamsize n, signed char* put) throw ()
+ : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
+ _M_frozen(false), _M_constant(false)
+ { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); }
+
+ strstreambuf::strstreambuf(unsigned char* get, streamsize n,
+ unsigned char* put) throw ()
+ : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
+ _M_frozen(false), _M_constant(false)
+ { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); }
+
+ strstreambuf::strstreambuf(const char* get, streamsize n) throw ()
+ : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
+ _M_frozen(false), _M_constant(true)
+ { _M_setup(const_cast<char*>(get), 0, n); }
+
+ strstreambuf::strstreambuf(const signed char* get, streamsize n) throw ()
+ : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
+ _M_frozen(false), _M_constant(true)
+ { _M_setup(reinterpret_cast<char*>(const_cast<signed char*>(get)), 0, n); }
+
+ strstreambuf::strstreambuf(const unsigned char* get, streamsize n) throw ()
+ : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
+ _M_frozen(false), _M_constant(true)
+ { _M_setup(reinterpret_cast<char*>(const_cast<unsigned char*>(get)), 0, n); }
+
+ strstreambuf::~strstreambuf()
+ {
+ if (_M_dynamic && !_M_frozen)
+ _M_free(eback());
+ }
+
+ void
+ strstreambuf::freeze(bool frozenflag) throw ()
+ {
+ if (_M_dynamic)
+ _M_frozen = frozenflag;
+ }
+
+ char*
+ strstreambuf::str() throw ()
+ {
+ freeze(true);
+ return eback();
+ }
+
+ int
+ strstreambuf::pcount() const throw ()
+ { return pptr() ? pptr() - pbase() : 0; }
+
+ strstreambuf::int_type
+ strstreambuf::overflow(int_type c)
+ {
+ if (c == traits_type::eof())
+ return traits_type::not_eof(c);
+
+ // Try to expand the buffer.
+ if (pptr() == epptr() && _M_dynamic && !_M_frozen && !_M_constant)
+ {
+ ptrdiff_t old_size = epptr() - pbase();
+ ptrdiff_t new_size = std::max(ptrdiff_t(2 * old_size), ptrdiff_t(1));
+
+ char* buf = _M_alloc(new_size);
+ if (buf)
+ {
+ memcpy(buf, pbase(), old_size);
+ char* old_buffer = pbase();
+ bool reposition_get = false;
+ ptrdiff_t old_get_offset;
+ if (gptr() != 0)
+ {
+ reposition_get = true;
+ old_get_offset = gptr() - eback();
+ }
+
+ setp(buf, buf + new_size);
+ __safe_pbump(old_size);
+
+ if (reposition_get)
+ setg(buf, buf + old_get_offset, buf +
+ std::max(old_get_offset, old_size));
+
+ _M_free(old_buffer);
+ }
+ }
+
+ if (pptr() != epptr())
+ {
+ *pptr() = c;
+ pbump(1);
+ return c;
+ }
+ else
+ return traits_type::eof();
+ }
+
+ strstreambuf::int_type
+ strstreambuf::pbackfail(int_type c)
+ {
+ if (gptr() != eback())
+ {
+ if (c == _Traits::eof())
+ {
+ gbump(-1);
+ return _Traits::not_eof(c);
+ }
+ else if (c == _Traits::to_int_type(gptr()[-1]))
+ { // KLUDGE
+ gbump(-1);
+ return c;
+ }
+ else if (!_M_constant)
+ {
+ gbump(-1);
+ *gptr() = c;
+ return c;
+ }
+ }
+ return _Traits::eof();
+ }
+
+ strstreambuf::int_type
+ strstreambuf::underflow()
+ {
+ if (gptr() == egptr() && pptr() && pptr() > egptr())
+ setg(eback(), gptr(), pptr());
+
+ if (gptr() != egptr())
+ return (unsigned char) *gptr();
+ else
+ return _Traits::eof();
+ }
+
+ basic_streambuf<char, char_traits<char> >*
+ strstreambuf::setbuf(char*, streamsize)
+ { return this; }
+
+ strstreambuf::pos_type
+ strstreambuf::seekoff(off_type off, ios_base::seekdir dir,
+ ios_base::openmode mode)
+ {
+ bool do_get = false;
+ bool do_put = false;
+
+ if ((mode & (ios_base::in | ios_base::out))
+ == (ios_base::in | ios_base::out) &&
+ (dir == ios_base::beg || dir == ios_base::end))
+ do_get = do_put = true;
+ else if (mode & ios_base::in)
+ do_get = true;
+ else if (mode & ios_base::out)
+ do_put = true;
+
+ // !gptr() is here because, according to D.7.1 paragraph 4, the seekable
+ // area is undefined if there is no get area.
+ if ((!do_get && !do_put) || (do_put && !pptr()) || !gptr())
+ return pos_type(off_type(-1));
+
+ char* seeklow = eback();
+ char* seekhigh = epptr() ? epptr() : egptr();
+
+ off_type newoff;
+ switch (dir)
+ {
+ case ios_base::beg:
+ newoff = 0;
+ break;
+ case ios_base::end:
+ newoff = seekhigh - seeklow;
+ break;
+ case ios_base::cur:
+ newoff = do_put ? pptr() - seeklow : gptr() - seeklow;
+ break;
+ default:
+ return pos_type(off_type(-1));
+ }
+
+ off += newoff;
+ if (off < 0 || off > seekhigh - seeklow)
+ return pos_type(off_type(-1));
+
+ if (do_put)
+ {
+ if (seeklow + off < pbase())
+ {
+ setp(seeklow, epptr());
+ __safe_pbump(off);
+ }
+ else
+ {
+ setp(pbase(), epptr());
+ __safe_pbump(off - (pbase() - seeklow));
+ }
+ }
+ if (do_get)
+ {
+ if (off <= egptr() - seeklow)
+ setg(seeklow, seeklow + off, egptr());
+ else if (off <= pptr() - seeklow)
+ setg(seeklow, seeklow + off, pptr());
+ else
+ setg(seeklow, seeklow + off, epptr());
+ }
+ return pos_type(newoff);
+ }
+
+ strstreambuf::pos_type
+ strstreambuf::seekpos(pos_type pos, ios_base::openmode mode)
+ { return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode); }
+
+ char*
+ strstreambuf::_M_alloc(size_t n)
+ {
+ if (_M_alloc_fun)
+ return static_cast<char*>(_M_alloc_fun(n));
+ else
+ return new char[n];
+ }
+
+ void
+ strstreambuf::_M_free(char* p)
+ {
+ if (p)
+ {
+ if (_M_free_fun)
+ _M_free_fun(p);
+ else
+ delete[] p;
+ }
+ }
+
+ void
+ strstreambuf::_M_setup(char* get, char* put, streamsize n) throw ()
+ {
+ if (get)
+ {
+ size_t N = n > 0 ? size_t(n) : n == 0 ? strlen(get) : size_t(INT_MAX);
+
+ if (put)
+ {
+ setg(get, get, put);
+ setp(put, put + N);
+ }
+ else
+ setg(get, get, get + N);
+ }
+ }
+
+ istrstream::istrstream(char* s)
+ : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0)
+ { basic_ios<char>::init(&_M_buf); }
+
+ istrstream::istrstream(const char* s)
+ : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0)
+ { basic_ios<char>::init(&_M_buf); }
+
+ istrstream::istrstream(char* s, streamsize n)
+ : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n)
+ { basic_ios<char>::init(&_M_buf); }
+
+ istrstream::istrstream(const char* s, streamsize n)
+ : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n)
+ { basic_ios<char>::init(&_M_buf); }
+
+ istrstream::~istrstream() { }
+
+ strstreambuf*
+ istrstream::rdbuf() const throw ()
+ { return const_cast<strstreambuf*>(&_M_buf); }
+
+ char*
+ istrstream::str() throw ()
+ { return _M_buf.str(); }
+
+ ostrstream::ostrstream()
+ : basic_ios<char>(), basic_ostream<char>(0), _M_buf()
+ { basic_ios<char>::init(&_M_buf); }
+
+ ostrstream::ostrstream(char* s, int n, ios_base::openmode mode)
+ : basic_ios<char>(), basic_ostream<char>(0),
+ _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s)
+ { basic_ios<char>::init(&_M_buf); }
+
+ ostrstream::~ostrstream() {}
+
+ strstreambuf*
+ ostrstream::rdbuf() const throw ()
+ { return const_cast<strstreambuf*>(&_M_buf); }
+
+ void
+ ostrstream::freeze(bool freezeflag) throw ()
+ { _M_buf.freeze(freezeflag); }
+
+ char*
+ ostrstream::str() throw ()
+ { return _M_buf.str(); }
+
+ int
+ ostrstream::pcount() const throw ()
+ { return _M_buf.pcount(); }
+
+ strstream::strstream()
+ : basic_ios<char>(), basic_iostream<char>(0), _M_buf()
+ { basic_ios<char>::init(&_M_buf); }
+
+ strstream::strstream(char* s, int n, ios_base::openmode mode)
+ : basic_ios<char>(), basic_iostream<char>(0),
+ _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s)
+ { basic_ios<char>::init(&_M_buf); }
+
+ strstream::~strstream() { }
+
+ strstreambuf*
+ strstream::rdbuf() const throw ()
+ { return const_cast<strstreambuf*>(&_M_buf); }
+
+ void
+ strstream::freeze(bool freezeflag) throw ()
+ { _M_buf.freeze(freezeflag); }
+
+ int
+ strstream::pcount() const throw ()
+ { return _M_buf.pcount(); }
+
+ char*
+ strstream::str() throw ()
+ { return _M_buf.str(); }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
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