mirror of
https://github.com/classilla/tenfourfox.git
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392 lines
10 KiB
C++
392 lines
10 KiB
C++
/*
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* Copyright (c) 1999
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* Silicon Graphics Computer Systems, Inc.
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*
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* Copyright (c) 1999
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* Boris Fomitchev
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*
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* This material is provided "as is", with absolutely no warranty expressed
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* or implied. Any use is at your own risk.
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*
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* Permission to use or copy this software for any purpose is hereby granted
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* without fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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*/
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// Implementation of the classes in header <strstream>.
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// WARNING: The classes defined in <strstream> are DEPRECATED. This
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// header is defined in section D.7.1 of the C++ standard, and it
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// MAY BE REMOVED in a future standard revision. You should use the
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// header <sstream> instead.
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#include "stlport_prefix.h"
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#include <strstream>
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#include <algorithm>
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#include <limits>
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_STLP_BEGIN_NAMESPACE
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// strstreambuf constructor, destructor.
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strstreambuf::strstreambuf(streamsize initial_capacity)
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: _M_alloc_fun(0), _M_free_fun(0),
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_M_dynamic(true), _M_frozen(false), _M_constant(false) {
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size_t n = (sizeof(streamsize) > sizeof(size_t)) ? __STATIC_CAST(size_t, (min)(__STATIC_CAST(streamsize, (numeric_limits<size_t>::max)()),
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(max)(initial_capacity, streamsize(16))))
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: __STATIC_CAST(size_t, (max)(initial_capacity, streamsize(16)));
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char* buf = _M_alloc(n);
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if (buf) {
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setp(buf, buf + n);
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setg(buf, buf, buf);
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}
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}
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strstreambuf::strstreambuf(__alloc_fn alloc_f, __free_fn free_f)
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: _M_alloc_fun(alloc_f), _M_free_fun(free_f),
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_M_dynamic(true), _M_frozen(false), _M_constant(false) {
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size_t n = 16;
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char* buf = _M_alloc(n);
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if (buf) {
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setp(buf, buf + n);
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setg(buf, buf, buf);
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}
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}
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strstreambuf::strstreambuf(char* get, streamsize n, char* put)
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: _M_alloc_fun(0), _M_free_fun(0),
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_M_dynamic(false), _M_frozen(false), _M_constant(false) {
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_M_setup(get, put, n);
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}
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strstreambuf::strstreambuf(signed char* get, streamsize n, signed char* put)
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: _M_alloc_fun(0), _M_free_fun(0),
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_M_dynamic(false), _M_frozen(false), _M_constant(false) {
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_M_setup(__REINTERPRET_CAST(char*,get), __REINTERPRET_CAST(char*,put), n);
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}
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strstreambuf::strstreambuf(unsigned char* get, streamsize n,
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unsigned char* put)
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: _M_alloc_fun(0), _M_free_fun(0),
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_M_dynamic(false), _M_frozen(false), _M_constant(false) {
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_M_setup(__REINTERPRET_CAST(char*,get), __REINTERPRET_CAST(char*,put), n);
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}
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strstreambuf::strstreambuf(const char* get, streamsize n)
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: _M_alloc_fun(0), _M_free_fun(0),
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_M_dynamic(false), _M_frozen(false), _M_constant(true) {
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_M_setup(__CONST_CAST(char*,get), 0, n);
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}
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strstreambuf::strstreambuf(const signed char* get, streamsize n)
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: _M_alloc_fun(0), _M_free_fun(0),
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_M_dynamic(false), _M_frozen(false), _M_constant(true) {
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_M_setup(__REINTERPRET_CAST(char*, __CONST_CAST(signed char*,get)), 0, n);
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}
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strstreambuf::strstreambuf(const unsigned char* get, streamsize n)
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: _M_alloc_fun(0), _M_free_fun(0),
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_M_dynamic(false), _M_frozen(false), _M_constant(true) {
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_M_setup(__REINTERPRET_CAST(char*, __CONST_CAST(unsigned char*,get)), 0, n);
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}
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strstreambuf::~strstreambuf() {
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if (_M_dynamic && !_M_frozen)
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_M_free(eback());
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}
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void strstreambuf::freeze(bool frozenflag) {
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if (_M_dynamic)
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_M_frozen = frozenflag;
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}
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char* strstreambuf::str() {
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freeze(true);
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return eback();
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}
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int strstreambuf::pcount() const {
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return int(pptr() ? pptr() - pbase() : 0);
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}
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strstreambuf::int_type strstreambuf::overflow(int_type c) {
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if (c == traits_type::eof())
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return traits_type::not_eof(c);
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// Try to expand the buffer.
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if (pptr() == epptr() && _M_dynamic && !_M_frozen && !_M_constant) {
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ptrdiff_t old_size = epptr() - pbase();
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ptrdiff_t new_size = (max)(2 * old_size, ptrdiff_t(1));
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char* buf = _M_alloc(new_size);
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if (buf) {
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memcpy(buf, pbase(), old_size);
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char* old_buffer = pbase();
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bool reposition_get = false;
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ptrdiff_t old_get_offset;
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if (gptr() != 0) {
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reposition_get = true;
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old_get_offset = gptr() - eback();
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}
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setp(buf, buf + new_size);
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pbump((int)old_size);
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if (reposition_get)
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setg(buf, buf + old_get_offset, buf + (max)(old_get_offset, old_size));
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_M_free(old_buffer);
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}
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}
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if (pptr() != epptr()) {
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*pptr() = traits_type::to_char_type(c);
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pbump(1);
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return c;
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}
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else
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return traits_type::eof();
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}
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strstreambuf::int_type strstreambuf::pbackfail(int_type c) {
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if (gptr() != eback()) {
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if (c == traits_type::eof()) {
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gbump(-1);
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return traits_type::not_eof(c);
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}
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else if (c == gptr()[-1]) {
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gbump(-1);
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return c;
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}
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else if (!_M_constant) {
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gbump(-1);
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*gptr() = traits_type::to_char_type(c);
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return c;
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}
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}
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return traits_type::eof();
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}
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strstreambuf::int_type strstreambuf::underflow() {
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if (gptr() == egptr() && pptr() && pptr() > egptr())
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setg(eback(), gptr(), pptr());
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if (gptr() != egptr())
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return (unsigned char) *gptr();
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else
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return _Traits::eof();
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}
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basic_streambuf<char, char_traits<char> >*
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strstreambuf::setbuf(char*, streamsize) {
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return this;
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}
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strstreambuf::pos_type
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strstreambuf::seekoff(off_type off,
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ios_base::seekdir dir, ios_base::openmode mode) {
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bool do_get = false;
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bool do_put = false;
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if ((mode & (ios_base::in | ios_base::out)) ==
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(ios_base::in | ios_base::out) &&
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(dir == ios_base::beg || dir == ios_base::end))
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do_get = do_put = true;
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else if (mode & ios_base::in)
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do_get = true;
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else if (mode & ios_base::out)
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do_put = true;
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// !gptr() is here because, according to D.7.1 paragraph 4, the seekable
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// area is undefined if there is no get area.
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if ((!do_get && !do_put) || (do_put && !pptr()) || !gptr())
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return pos_type(off_type(-1));
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char* seeklow = eback();
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char* seekhigh = epptr() ? epptr() : egptr();
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off_type newoff;
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switch(dir) {
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case ios_base::beg:
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newoff = 0;
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break;
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case ios_base::end:
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newoff = seekhigh - seeklow;
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break;
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case ios_base::cur:
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newoff = do_put ? pptr() - seeklow : gptr() - seeklow;
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break;
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default:
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return pos_type(off_type(-1));
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}
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off += newoff;
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if (off < 0 || off > seekhigh - seeklow)
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return pos_type(off_type(-1));
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if (do_put) {
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if (seeklow + __STATIC_CAST(ptrdiff_t, off) < pbase()) {
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setp(seeklow, epptr());
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pbump((int)off);
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}
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else {
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setp(pbase(), epptr());
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pbump((int)(off - (pbase() - seeklow)));
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}
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}
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if (do_get) {
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if (off <= egptr() - seeklow)
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setg(seeklow, seeklow + __STATIC_CAST(ptrdiff_t, off), egptr());
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else if (off <= pptr() - seeklow)
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setg(seeklow, seeklow + __STATIC_CAST(ptrdiff_t, off), pptr());
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else
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setg(seeklow, seeklow + __STATIC_CAST(ptrdiff_t, off), epptr());
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}
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return pos_type(newoff);
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}
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strstreambuf::pos_type
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strstreambuf::seekpos(pos_type pos, ios_base::openmode mode) {
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return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode);
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}
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char* strstreambuf::_M_alloc(size_t n) {
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if (_M_alloc_fun)
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return __STATIC_CAST(char*,_M_alloc_fun(n));
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else
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return new char[n];
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}
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void strstreambuf::_M_free(char* p) {
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if (p) {
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if (_M_free_fun)
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_M_free_fun(p);
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else
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delete[] p;
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}
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}
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void strstreambuf::_M_setup(char* get, char* put, streamsize n) {
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if (get) {
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size_t N = n > 0 ? size_t(n) : n == 0 ? strlen(get) : size_t(INT_MAX);
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if (put) {
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setg(get, get, get + N);
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setp(put, put + N);
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}
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else {
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setg(get, get, get + N);
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}
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}
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}
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//----------------------------------------------------------------------
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// Class istrstream
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istrstream::istrstream(char* s)
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: basic_istream<char, char_traits<char> >(0), _M_buf(s, 0) {
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this->init(&_M_buf);
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}
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istrstream::istrstream(const char* s)
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: basic_istream<char, char_traits<char> >(0), _M_buf(s, 0) {
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this->init(&_M_buf);
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}
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istrstream::istrstream(char* s, streamsize n)
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: basic_istream<char, char_traits<char> >(0), _M_buf(s, n) {
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this->init(&_M_buf);
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}
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istrstream::istrstream(const char* s, streamsize n)
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: basic_istream<char, char_traits<char> >(0), _M_buf(s, n) {
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this->init(&_M_buf);
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}
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istrstream::~istrstream() {}
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strstreambuf* istrstream::rdbuf() const {
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return __CONST_CAST(strstreambuf*,&_M_buf);
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}
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char* istrstream::str() { return _M_buf.str(); }
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//----------------------------------------------------------------------
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// Class ostrstream
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ostrstream::ostrstream()
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: basic_ostream<char, char_traits<char> >(0), _M_buf() {
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basic_ios<char, char_traits<char> >::init(&_M_buf);
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}
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ostrstream::ostrstream(char* s, int n, ios_base::openmode mode)
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: basic_ostream<char, char_traits<char> >(0),
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_M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s) {
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basic_ios<char, char_traits<char> >::init(&_M_buf);
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}
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ostrstream::~ostrstream() {}
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strstreambuf* ostrstream::rdbuf() const {
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return __CONST_CAST(strstreambuf*,&_M_buf);
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}
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void ostrstream::freeze(bool freezeflag) {
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_M_buf.freeze(freezeflag);
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}
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char* ostrstream::str() {
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return _M_buf.str();
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}
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int ostrstream::pcount() const {
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return _M_buf.pcount();
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}
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//----------------------------------------------------------------------
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// Class strstream
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strstream::strstream()
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: basic_iostream<char, char_traits<char> >(0), _M_buf() {
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basic_ios<char, char_traits<char> >::init(&_M_buf);
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}
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strstream::strstream(char* s, int n, ios_base::openmode mode)
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: basic_iostream<char, char_traits<char> >(0),
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_M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s) {
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basic_ios<char, char_traits<char> >::init(&_M_buf);
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}
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strstream::~strstream() {}
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strstreambuf* strstream::rdbuf() const {
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return __CONST_CAST(strstreambuf*,&_M_buf);
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}
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void strstream::freeze(bool freezeflag) {
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_M_buf.freeze(freezeflag);
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}
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int strstream::pcount() const {
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return _M_buf.pcount();
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}
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char* strstream::str() {
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return _M_buf.str();
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}
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_STLP_END_NAMESPACE
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// Local Variables:
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// mode:C++
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// End:
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