1 // strstream definitions -*- C++ -*-
3 // Copyright (C) 2001, 2002, 2003, 2005, 2009 Free Software Foundation
5 // This file is part of the GNU ISO C++ Library. This library is free
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7 // terms of the GNU General Public License as published by the
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
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18 // 3.1, as published by the Free Software Foundation.
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27 * Silicon Graphics Computer Systems, Inc.
29 * Permission to use, copy, modify, distribute and sell this software
30 * and its documentation for any purpose is hereby granted without fee,
31 * provided that the above copyright notice appear in all copies and
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38 // Implementation of the classes in header <strstream>.
39 // WARNING: The classes defined in <strstream> are DEPRECATED. This
40 // header is defined in section D.7.1 of the C++ standard, and it
41 // MAY BE REMOVED in a future standard revision. You should use the
42 // header <sstream> instead.
51 _GLIBCXX_BEGIN_NAMESPACE(std)
53 strstreambuf::strstreambuf(streamsize initial_capacity)
54 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(true),
55 _M_frozen(false), _M_constant(false)
57 streamsize n = std::max(initial_capacity, streamsize(16));
59 char* buf = _M_alloc(n);
67 strstreambuf::strstreambuf(void* (*alloc_f)(size_t), void (*free_f)(void*))
68 : _Base(), _M_alloc_fun(alloc_f), _M_free_fun(free_f), _M_dynamic(true),
69 _M_frozen(false), _M_constant(false)
73 char* buf = _M_alloc(n);
81 strstreambuf::strstreambuf(char* get, streamsize n, char* put) throw ()
82 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
83 _M_frozen(false), _M_constant(false)
84 { _M_setup(get, put, n); }
86 strstreambuf::strstreambuf(signed char* get, streamsize n, signed char* put) throw ()
87 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
88 _M_frozen(false), _M_constant(false)
89 { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); }
91 strstreambuf::strstreambuf(unsigned char* get, streamsize n,
92 unsigned char* put) throw ()
93 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
94 _M_frozen(false), _M_constant(false)
95 { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); }
97 strstreambuf::strstreambuf(const char* get, streamsize n) throw ()
98 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
99 _M_frozen(false), _M_constant(true)
100 { _M_setup(const_cast<char*>(get), 0, n); }
102 strstreambuf::strstreambuf(const signed char* get, streamsize n) throw ()
103 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
104 _M_frozen(false), _M_constant(true)
105 { _M_setup(reinterpret_cast<char*>(const_cast<signed char*>(get)), 0, n); }
107 strstreambuf::strstreambuf(const unsigned char* get, streamsize n) throw ()
108 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false),
109 _M_frozen(false), _M_constant(true)
110 { _M_setup(reinterpret_cast<char*>(const_cast<unsigned char*>(get)), 0, n); }
112 strstreambuf::~strstreambuf()
114 if (_M_dynamic && !_M_frozen)
119 strstreambuf::freeze(bool frozenflag) throw ()
122 _M_frozen = frozenflag;
126 strstreambuf::str() throw ()
133 strstreambuf::pcount() const throw ()
134 { return pptr() ? pptr() - pbase() : 0; }
136 strstreambuf::int_type
137 strstreambuf::overflow(int_type c)
139 if (c == traits_type::eof())
140 return traits_type::not_eof(c);
142 // Try to expand the buffer.
143 if (pptr() == epptr() && _M_dynamic && !_M_frozen && !_M_constant)
145 ptrdiff_t old_size = epptr() - pbase();
146 ptrdiff_t new_size = std::max(ptrdiff_t(2 * old_size), ptrdiff_t(1));
148 char* buf = _M_alloc(new_size);
151 memcpy(buf, pbase(), old_size);
152 char* old_buffer = pbase();
153 bool reposition_get = false;
154 ptrdiff_t old_get_offset;
157 reposition_get = true;
158 old_get_offset = gptr() - eback();
161 setp(buf, buf + new_size);
165 setg(buf, buf + old_get_offset, buf +
166 std::max(old_get_offset, old_size));
172 if (pptr() != epptr())
179 return traits_type::eof();
182 strstreambuf::int_type
183 strstreambuf::pbackfail(int_type c)
185 if (gptr() != eback())
187 if (c == _Traits::eof())
190 return _Traits::not_eof(c);
192 else if (c == _Traits::to_int_type(gptr()[-1]))
197 else if (!_M_constant)
204 return _Traits::eof();
207 strstreambuf::int_type
208 strstreambuf::underflow()
210 if (gptr() == egptr() && pptr() && pptr() > egptr())
211 setg(eback(), gptr(), pptr());
213 if (gptr() != egptr())
214 return (unsigned char) *gptr();
216 return _Traits::eof();
219 basic_streambuf<char, char_traits<char> >*
220 strstreambuf::setbuf(char*, streamsize)
223 strstreambuf::pos_type
224 strstreambuf::seekoff(off_type off, ios_base::seekdir dir,
225 ios_base::openmode mode)
230 if ((mode & (ios_base::in | ios_base::out))
231 == (ios_base::in | ios_base::out) &&
232 (dir == ios_base::beg || dir == ios_base::end))
233 do_get = do_put = true;
234 else if (mode & ios_base::in)
236 else if (mode & ios_base::out)
239 // !gptr() is here because, according to D.7.1 paragraph 4, the seekable
240 // area is undefined if there is no get area.
241 if ((!do_get && !do_put) || (do_put && !pptr()) || !gptr())
242 return pos_type(off_type(-1));
244 char* seeklow = eback();
245 char* seekhigh = epptr() ? epptr() : egptr();
254 newoff = seekhigh - seeklow;
257 newoff = do_put ? pptr() - seeklow : gptr() - seeklow;
260 return pos_type(off_type(-1));
264 if (off < 0 || off > seekhigh - seeklow)
265 return pos_type(off_type(-1));
269 if (seeklow + off < pbase())
271 setp(seeklow, epptr());
276 setp(pbase(), epptr());
277 pbump(off - (pbase() - seeklow));
282 if (off <= egptr() - seeklow)
283 setg(seeklow, seeklow + off, egptr());
284 else if (off <= pptr() - seeklow)
285 setg(seeklow, seeklow + off, pptr());
287 setg(seeklow, seeklow + off, epptr());
289 return pos_type(newoff);
292 strstreambuf::pos_type
293 strstreambuf::seekpos(pos_type pos, ios_base::openmode mode)
294 { return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode); }
297 strstreambuf::_M_alloc(size_t n)
300 return static_cast<char*>(_M_alloc_fun(n));
306 strstreambuf::_M_free(char* p)
318 strstreambuf::_M_setup(char* get, char* put, streamsize n) throw ()
322 size_t N = n > 0 ? size_t(n) : n == 0 ? strlen(get) : size_t(INT_MAX);
330 setg(get, get, get + N);
334 istrstream::istrstream(char* s)
335 : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0)
336 { basic_ios<char>::init(&_M_buf); }
338 istrstream::istrstream(const char* s)
339 : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0)
340 { basic_ios<char>::init(&_M_buf); }
342 istrstream::istrstream(char* s, streamsize n)
343 : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n)
344 { basic_ios<char>::init(&_M_buf); }
346 istrstream::istrstream(const char* s, streamsize n)
347 : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n)
348 { basic_ios<char>::init(&_M_buf); }
350 istrstream::~istrstream() { }
353 istrstream::rdbuf() const throw ()
354 { return const_cast<strstreambuf*>(&_M_buf); }
357 istrstream::str() throw ()
358 { return _M_buf.str(); }
360 ostrstream::ostrstream()
361 : basic_ios<char>(), basic_ostream<char>(0), _M_buf()
362 { basic_ios<char>::init(&_M_buf); }
364 ostrstream::ostrstream(char* s, int n, ios_base::openmode mode)
365 : basic_ios<char>(), basic_ostream<char>(0),
366 _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s)
367 { basic_ios<char>::init(&_M_buf); }
369 ostrstream::~ostrstream() {}
372 ostrstream::rdbuf() const throw ()
373 { return const_cast<strstreambuf*>(&_M_buf); }
376 ostrstream::freeze(bool freezeflag) throw ()
377 { _M_buf.freeze(freezeflag); }
380 ostrstream::str() throw ()
381 { return _M_buf.str(); }
384 ostrstream::pcount() const throw ()
385 { return _M_buf.pcount(); }
387 strstream::strstream()
388 : basic_ios<char>(), basic_iostream<char>(0), _M_buf()
389 { basic_ios<char>::init(&_M_buf); }
391 strstream::strstream(char* s, int n, ios_base::openmode mode)
392 : basic_ios<char>(), basic_iostream<char>(0),
393 _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s)
394 { basic_ios<char>::init(&_M_buf); }
396 strstream::~strstream() { }
399 strstream::rdbuf() const throw ()
400 { return const_cast<strstreambuf*>(&_M_buf); }
403 strstream::freeze(bool freezeflag) throw ()
404 { _M_buf.freeze(freezeflag); }
407 strstream::pcount() const throw ()
408 { return _M_buf.pcount(); }
411 strstream::str() throw ()
412 { return _M_buf.str(); }
414 _GLIBCXX_END_NAMESPACE