David Robillard
47a41c0d4d
git-svn-id: svn://localhost/ardour2/trunk@2791 d708f5d6-7413-0410-9779-e7cbd77b26cf
403 lines
9.9 KiB
C++
403 lines
9.9 KiB
C++
/* Copyright (C) 2004 The glibmm Development Team
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, 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
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the Free
|
|
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include "fdstream.h"
|
|
|
|
#include <glibmm/main.h>
|
|
|
|
fdstreambuf::fdstreambuf()
|
|
{
|
|
reset();
|
|
}
|
|
|
|
fdstreambuf::fdstreambuf(int fd, bool manage)
|
|
{
|
|
create_iochannel(fd, manage);
|
|
}
|
|
|
|
fdstreambuf::~fdstreambuf()
|
|
{
|
|
sync();
|
|
}
|
|
|
|
void fdstreambuf::reset()
|
|
{
|
|
setg(putback_buffer + 1, putback_buffer + 1, putback_buffer + 1);
|
|
error_condition.error = false;
|
|
}
|
|
|
|
void fdstreambuf::create_iochannel(int fd, bool manage)
|
|
{
|
|
sync();
|
|
reset();
|
|
|
|
if(fd >= 0)
|
|
{
|
|
iochannel_ = Glib::IOChannel::create_from_fd(fd);
|
|
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
iochannel_->set_encoding("");
|
|
#else
|
|
std::auto_ptr<Glib::Error> ex;
|
|
iochannel_->set_encoding("", ex);
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
|
|
iochannel_->set_buffered(true);
|
|
iochannel_->set_close_on_unref(manage);
|
|
}
|
|
}
|
|
|
|
void fdstreambuf::detach_fd()
|
|
{
|
|
iochannel_->set_close_on_unref(false);
|
|
}
|
|
|
|
void fdstreambuf::connect(const sigc::slot<bool, Glib::IOCondition>& callback,
|
|
Glib::IOCondition condition)
|
|
{
|
|
Glib::signal_io().connect(callback, iochannel_, condition);
|
|
}
|
|
|
|
fdstream_error fdstreambuf::get_error() const
|
|
{
|
|
return error_condition;
|
|
}
|
|
|
|
// the standard requires sync to return 0 for success and -1 for error
|
|
int fdstreambuf::sync()
|
|
{
|
|
if (!iochannel_)
|
|
return -1;
|
|
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
try
|
|
{
|
|
iochannel_->flush();
|
|
}
|
|
catch(Glib::IOChannelError& io_error)
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = io_error.code();
|
|
return -1;
|
|
}
|
|
#else
|
|
std::auto_ptr<Glib::Error> io_error;
|
|
iochannel_->flush(io_error);
|
|
if(io_error.get())
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = (Glib::IOChannelError::Code)io_error->code();
|
|
return -1;
|
|
}
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
|
|
return 0;
|
|
}
|
|
|
|
void fdstreambuf::close_iochannel()
|
|
{
|
|
iochannel_->set_close_on_unref(false);
|
|
reset();
|
|
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
try
|
|
{
|
|
iochannel_->close(true);
|
|
}
|
|
catch(Glib::IOChannelError& io_error)
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = io_error.code();
|
|
}
|
|
#else
|
|
std::auto_ptr<Glib::Error> io_error;
|
|
iochannel_->close(true, io_error);
|
|
if(io_error.get())
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = (Glib::IOChannelError::Code)io_error->code();
|
|
}
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
|
|
}
|
|
|
|
// the standard requires this to return either the character
|
|
// written on overflow or traits_type::eof() (= EOF with char_type == char)
|
|
fdstreambuf::traits_type::int_type fdstreambuf::overflow(int_type c)
|
|
{
|
|
if(!traits_type::eq_int_type(c, traits_type::eof()))
|
|
{
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
try
|
|
{
|
|
gsize result = 0;
|
|
char write_char = c;
|
|
iochannel_->write(&write_char, 1, result);
|
|
}
|
|
catch(Glib::IOChannelError& io_error)
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = io_error.code();
|
|
return traits_type::eof();
|
|
}
|
|
#else
|
|
std::auto_ptr<Glib::Error> io_error;
|
|
gsize result = 0;
|
|
char write_char = c;
|
|
iochannel_->write(&write_char, 1, result, io_error);
|
|
if(io_error.get())
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = (Glib::IOChannelError::Code)io_error->code();
|
|
return traits_type::eof();;
|
|
}
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
}
|
|
return traits_type::not_eof(c);
|
|
}
|
|
|
|
// the standard requires this to return the number of characters written
|
|
// (which will be 0 for stream failure - it is not correct to return EOF)
|
|
std::streamsize fdstreambuf::xsputn(const char* source, std::streamsize num)
|
|
{
|
|
gsize result = 0;
|
|
|
|
// the documentation for Glib::IOChannel indicates that Glib::IOChannel::write()
|
|
// will only do a short write in the event of stream failure, so there is no
|
|
// need to check result and have a second bite (byte) at it as would be
|
|
// necessary with Unix write()
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
try
|
|
{
|
|
iochannel_->write(source, num, result);
|
|
}
|
|
catch(Glib::IOChannelError& io_error)
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = io_error.code();
|
|
result = 0;
|
|
}
|
|
#else
|
|
std::auto_ptr<Glib::Error> io_error;
|
|
iochannel_->write(source, num, result, io_error);
|
|
if(io_error.get())
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = (Glib::IOChannelError::Code)io_error->code();
|
|
result = 0;
|
|
}
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
|
|
return result;
|
|
}
|
|
|
|
// the standard requires this to return the first character available
|
|
// on underflow or traits_type::eof() (= EOF with char_type == char)
|
|
fdstreambuf::traits_type::int_type fdstreambuf::underflow()
|
|
{
|
|
if(gptr() < egptr())
|
|
return traits_type::to_int_type(*gptr());
|
|
|
|
// copy the character in bump position (if any) to putback position
|
|
if(gptr() - eback())
|
|
*putback_buffer = *(gptr() - 1);
|
|
|
|
// now insert a character into the bump position
|
|
gsize result = 0;
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
try
|
|
{
|
|
iochannel_->read(putback_buffer + 1, 1, result);
|
|
}
|
|
catch(Glib::IOChannelError& io_error)
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = io_error.code();
|
|
return traits_type::eof();
|
|
}
|
|
#else
|
|
std::auto_ptr<Glib::Error> io_error;
|
|
iochannel_->read(putback_buffer + 1, 1, result, io_error);
|
|
if(io_error.get())
|
|
{
|
|
error_condition.error = true;
|
|
error_condition.code = (Glib::IOChannelError::Code)io_error->code();
|
|
return traits_type::eof();
|
|
}
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
|
|
// some other error - is this possible? In case it is, cater for it
|
|
if (result == 0)
|
|
return traits_type::eof();
|
|
|
|
// reset buffer pointers
|
|
setg(putback_buffer,
|
|
putback_buffer + 1,
|
|
putback_buffer + 2);
|
|
|
|
// return character in bump/peek position
|
|
return traits_type::to_int_type(*gptr()); // == *(putback_buffer + 1)
|
|
}
|
|
|
|
// the standard requires this to return the number of characters fetched
|
|
// (which will be 0 for stream failure - it is not correct to return EOF)
|
|
std::streamsize fdstreambuf::xsgetn(char* dest, std::streamsize num)
|
|
{
|
|
std::streamsize chars_read = 0;
|
|
|
|
// available would normally be 0, but could be up to 2 if there
|
|
// have been putbacks or a peek and a putback
|
|
std::streamsize available = egptr() - gptr();
|
|
|
|
// if num is less than or equal to the characters already in the
|
|
// putback buffer, extract from buffer
|
|
if (num <= available)
|
|
{
|
|
traits_type::copy(dest, gptr(), num);
|
|
gbump(num);
|
|
chars_read = num;
|
|
}
|
|
else
|
|
{
|
|
// first copy out putback buffer
|
|
if (available)
|
|
{
|
|
traits_type::copy(dest, gptr(), available);
|
|
chars_read = available;
|
|
}
|
|
|
|
// read up to everything else we need with Glib::IOChannel::read()
|
|
gsize result = 0;
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
try
|
|
{
|
|
#else
|
|
std::auto_ptr<Glib::Error> io_error;
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
do
|
|
{
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
iochannel_->read(dest + chars_read,
|
|
num - chars_read,
|
|
result);
|
|
#else
|
|
iochannel_->read(dest + chars_read,
|
|
num - chars_read,
|
|
result, io_error);
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
|
|
if (result > 0)
|
|
chars_read += result;
|
|
}
|
|
while (result > 0 && result < static_cast<gsize>(num - chars_read));
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
}
|
|
catch(Glib::IOChannelError& io_error)
|
|
#else
|
|
if(io_error.get())
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
{
|
|
error_condition.error = true;
|
|
|
|
#ifdef GLIBMM_EXCEPTIONS_ENABLED
|
|
error_condition.code = io_error.code();
|
|
#else
|
|
error_condition.code = (Glib::IOChannelError::Code)io_error->code();
|
|
#endif //GLIBMM_EXCEPTIONS_ENABLED
|
|
return chars_read;
|
|
}
|
|
|
|
if(chars_read)
|
|
{
|
|
// now mimic extraction of all characters by sbumpc() by putting
|
|
// two characters into the buffer (if available) and resetting the
|
|
// buffer pointers
|
|
int putback_count = 0;
|
|
if(chars_read >= 2)
|
|
{
|
|
*putback_buffer = *(dest + (chars_read - 2));
|
|
putback_count = 2;
|
|
}
|
|
else
|
|
{ // if we have reached here then we have only fetched
|
|
// one character and it must have been read with
|
|
// Glib::IOChannel::read() and not taken from the
|
|
// putback buffer - otherwise we would have ended
|
|
// at the first if block in this method
|
|
// - and this also means that gptr() == egptr()
|
|
if(gptr() - eback())
|
|
{
|
|
*putback_buffer = *(gptr() - 1);
|
|
putback_count = 2;
|
|
}
|
|
else putback_count = 1;
|
|
}
|
|
|
|
*(putback_buffer + 1) = *(dest + (chars_read - 1));
|
|
|
|
// reset buffer pointers
|
|
this->setg(putback_buffer + (2 - putback_count),
|
|
putback_buffer + 2,
|
|
putback_buffer + 2);
|
|
}
|
|
}
|
|
return chars_read;
|
|
}
|
|
|
|
fdstream::fdstream(int fd, bool manage)
|
|
: std::istream(0),
|
|
std::ostream(0),
|
|
buf(fd, manage)
|
|
{
|
|
std::istream::rdbuf(&buf);
|
|
std::ostream::rdbuf(&buf);
|
|
}
|
|
|
|
fdstream::fdstream()
|
|
: std::istream(0),
|
|
std::ostream(0)
|
|
{
|
|
std::istream::rdbuf(&buf);
|
|
std::ostream::rdbuf(&buf);
|
|
}
|
|
|
|
void fdstream::attach(int fd, bool manage)
|
|
{
|
|
buf.create_iochannel(fd, manage);
|
|
}
|
|
|
|
void fdstream::detach()
|
|
{
|
|
buf.detach_fd();
|
|
}
|
|
|
|
void fdstream::close()
|
|
{
|
|
buf.close_iochannel();
|
|
}
|
|
|
|
void fdstream::connect(const sigc::slot<bool, Glib::IOCondition>& callback,
|
|
Glib::IOCondition condition)
|
|
{
|
|
buf.connect(callback, condition);
|
|
}
|
|
|
|
fdstream_error fdstream::get_error() const
|
|
{
|
|
return buf.get_error();
|
|
}
|