0,0 → 1,417 |
// strstream definitions -*- C++ -*- |
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// Copyright (C) 2001-2013 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. |
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// 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. |
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// 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. |
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// 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/>. |
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/* |
* 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. |
*/ |
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// 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. |
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#include <strstream> |
#include <algorithm> |
#include <new> |
#include <stdlib.h> |
#include <string.h> |
#include <limits.h> |
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namespace std _GLIBCXX_VISIBILITY(default) |
{ |
_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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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)); |
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char* buf = _M_alloc(n); |
if (buf) |
{ |
setp(buf, buf + n); |
setg(buf, buf, buf); |
} |
} |
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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; |
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char* buf = _M_alloc(n); |
if (buf) |
{ |
setp(buf, buf + n); |
setg(buf, buf, buf); |
} |
} |
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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); } |
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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); } |
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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); } |
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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); } |
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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); } |
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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); } |
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strstreambuf::~strstreambuf() |
{ |
if (_M_dynamic && !_M_frozen) |
_M_free(eback()); |
} |
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void |
strstreambuf::freeze(bool frozenflag) throw () |
{ |
if (_M_dynamic) |
_M_frozen = frozenflag; |
} |
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char* |
strstreambuf::str() throw () |
{ |
freeze(true); |
return eback(); |
} |
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int |
strstreambuf::pcount() const throw () |
{ return pptr() ? pptr() - pbase() : 0; } |
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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)); |
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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(); |
} |
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setp(buf, buf + new_size); |
__safe_pbump(old_size); |
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if (reposition_get) |
setg(buf, buf + old_get_offset, buf + |
std::max(old_get_offset, old_size)); |
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_M_free(old_buffer); |
} |
} |
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if (pptr() != epptr()) |
{ |
*pptr() = c; |
pbump(1); |
return c; |
} |
else |
return traits_type::eof(); |
} |
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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(); |
} |
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strstreambuf::int_type |
strstreambuf::underflow() |
{ |
if (gptr() == egptr() && pptr() && pptr() > egptr()) |
setg(eback(), gptr(), pptr()); |
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if (gptr() != egptr()) |
return (unsigned char) *gptr(); |
else |
return _Traits::eof(); |
} |
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basic_streambuf<char, char_traits<char> >* |
strstreambuf::setbuf(char*, streamsize) |
{ return this; } |
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strstreambuf::pos_type |
strstreambuf::seekoff(off_type off, ios_base::seekdir dir, |
ios_base::openmode mode) |
{ |
bool do_get = false; |
bool do_put = false; |
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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; |
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// !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)); |
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char* seeklow = eback(); |
char* seekhigh = epptr() ? epptr() : egptr(); |
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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)); |
} |
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off += newoff; |
if (off < 0 || off > seekhigh - seeklow) |
return pos_type(off_type(-1)); |
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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); |
} |
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strstreambuf::pos_type |
strstreambuf::seekpos(pos_type pos, ios_base::openmode mode) |
{ return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode); } |
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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; |
} |
} |
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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); |
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if (put) |
{ |
setg(get, get, put); |
setp(put, put + N); |
} |
else |
setg(get, get, get + N); |
} |
} |
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istrstream::istrstream(char* s) |
: basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0) |
{ basic_ios<char>::init(&_M_buf); } |
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istrstream::istrstream(const char* s) |
: basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0) |
{ basic_ios<char>::init(&_M_buf); } |
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istrstream::istrstream(char* s, streamsize n) |
: basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n) |
{ basic_ios<char>::init(&_M_buf); } |
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istrstream::istrstream(const char* s, streamsize n) |
: basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n) |
{ basic_ios<char>::init(&_M_buf); } |
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istrstream::~istrstream() { } |
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strstreambuf* |
istrstream::rdbuf() const throw () |
{ return const_cast<strstreambuf*>(&_M_buf); } |
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char* |
istrstream::str() throw () |
{ return _M_buf.str(); } |
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ostrstream::ostrstream() |
: basic_ios<char>(), basic_ostream<char>(0), _M_buf() |
{ basic_ios<char>::init(&_M_buf); } |
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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); } |
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ostrstream::~ostrstream() {} |
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strstreambuf* |
ostrstream::rdbuf() const throw () |
{ return const_cast<strstreambuf*>(&_M_buf); } |
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void |
ostrstream::freeze(bool freezeflag) throw () |
{ _M_buf.freeze(freezeflag); } |
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char* |
ostrstream::str() throw () |
{ return _M_buf.str(); } |
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int |
ostrstream::pcount() const throw () |
{ return _M_buf.pcount(); } |
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strstream::strstream() |
: basic_ios<char>(), basic_iostream<char>(0), _M_buf() |
{ basic_ios<char>::init(&_M_buf); } |
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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); } |
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strstream::~strstream() { } |
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strstreambuf* |
strstream::rdbuf() const throw () |
{ return const_cast<strstreambuf*>(&_M_buf); } |
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void |
strstream::freeze(bool freezeflag) throw () |
{ _M_buf.freeze(freezeflag); } |
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int |
strstream::pcount() const throw () |
{ return _M_buf.pcount(); } |
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char* |
strstream::str() throw () |
{ return _M_buf.str(); } |
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_GLIBCXX_END_NAMESPACE_VERSION |
} // namespace |