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Whole document tree                   strstream.cc Go to the documentation of this file. // strstream definitions -*- C++ -*- // Copyright (C) 2001 Free Software Foundation // // This file is part of GNU CC. // // GNU CC 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. // // GNU CC 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 GNU CC; 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. /* * 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.h> #include <algorithm> #include <new> #include <stdlib.h> #include <string.h> #include <limits.h> namespace std { // strstreambuf constructor, destructor. 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 = 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) : _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) : _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) : _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) : _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) : _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) : _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) { if (_M_dynamic) _M_frozen = frozenflag; } char* strstreambuf::str() { freeze(true); return eback(); } int strstreambuf::pcount() const { 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 = max(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); pbump(old_size); if (reposition_get) setg(buf, buf + old_get_offset, buf + 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 == static_cast<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()); pbump(off); } else { setp(pbase(), epptr()); 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) { 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); } } } //---------------------------------------------------------------------- // Class istrstream 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 { return const_cast<strstreambuf*>(&_M_buf); } char* istrstream::str() { return _M_buf.str(); } //---------------------------------------------------------------------- // Class ostrstream 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 { return const_cast<strstreambuf*>(&_M_buf); } void ostrstream::freeze(bool freezeflag) { _M_buf.freeze(freezeflag); } char* ostrstream::str() { return _M_buf.str(); } int ostrstream::pcount() const { return _M_buf.pcount(); } //---------------------------------------------------------------------- // Class strstream 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 { return const_cast<strstreambuf*>(&_M_buf); } void strstream::freeze(bool freezeflag) { _M_buf.freeze(freezeflag); } int strstream::pcount() const { return _M_buf.pcount(); } char* strstream::str() { return _M_buf.str(); } } // namespace std // Local Variables: // mode:C++ // End: