TwoTerm/cpp/OutputChannel.cpp

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/*
* OutputChannel.cpp
* 2Term
*
* Created by Kelvin Sherlock on 7/7/2010.
* Copyright 2010 __MyCompanyName__. All rights reserved.
*
*/
#include "OutputChannel.h"
#include <unistd.h>
#include <fcntl.h>
#include <cstring>
#include <cerrno>
bool OutputChannel::write(uint8_t c)
{
return write(&c, 1);
}
bool OutputChannel::write(const char *str)
{
return write(str, std::strlen(str));
}
bool OutputChannel::write(const void *vp, size_t size)
{
if (!size) return true;
for (unsigned i = 0; ;)
{
ssize_t s = ::write(_fd, vp, size);
if (s < 0)
{
switch (errno)
{
case EAGAIN:
case EINTR:
if (++i < 3) break;
default:
_error = errno;
// throw?
return false;
}
}
else if (size == s)
{
return true;
}
else if (s == 0)
{
if (++i == 3)
{
_error = EIO;
return false;
}
}
else
{
size -= s;
vp = (uint8_t *)vp + s;
if (size == 0) return true;
}
}
return false;
}