IOIFCStreamBuffer.cpp

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#include "blocxx/BLOCXX_config.h"
#include "blocxx/IOIFCStreamBuffer.hpp"
#include <cstring> // for strcmp

namespace BLOCXX_NAMESPACE
{

namespace
{
   IOIFCStreamBuffer::EDirectionFlag directionToEnum(const char* direction)
   {
      if (strcmp(direction, "in") == 0)
      {
         return IOIFCStreamBuffer::E_IN;
      }
      if (strcmp(direction, "out") == 0)
      {
         return IOIFCStreamBuffer::E_OUT;
      }
      return IOIFCStreamBuffer::E_IN_OUT;
   }
}

IOIFCStreamBuffer::IOIFCStreamBuffer(IOIFC* dev, int bufSize,
   const char* direction)
   : BaseStreamBuffer(directionToEnum(direction), bufSize)
   , m_dev(dev)
   , m_tied_buf(0)
   , m_error_action(IOIFC::E_RETURN_ON_ERROR)
{
}
IOIFCStreamBuffer::IOIFCStreamBuffer(IOIFC* dev, EDirectionFlag direction, int bufSize)
   : BaseStreamBuffer(direction, bufSize)
   , m_dev(dev)
   , m_tied_buf(0)
   , m_error_action(IOIFC::E_RETURN_ON_ERROR)
{
}
IOIFCStreamBuffer::~IOIFCStreamBuffer()
{
   try
   {
      sync();
   }
   catch (...)
   {
   }
}
std::streambuf * IOIFCStreamBuffer::tie(std::streambuf * tied_buf)
{
   std::streambuf * retval = m_tied_buf;
   m_tied_buf = tied_buf;
   return retval;
}
void IOIFCStreamBuffer::setErrorAction(IOIFC::ErrorAction error_action)
{
   m_error_action = error_action;
}

int
IOIFCStreamBuffer::buffer_from_device(char* c, int n)
{
   if (m_tied_buf)
   {
      m_tied_buf->pubsync();
   }
   return m_dev->read(c, n, m_error_action);
}
int
IOIFCStreamBuffer::buffer_to_device(const char* c, int n)
{
   while (n > 0)
   {
      int cnt = m_dev->write(c, n, m_error_action);
      if (cnt == -1) // failure
      {
         return -1;
      }
      c += cnt;
      n -= cnt;
   }
   return 0;
}

void
IOIFCStreamBuffer::reset()
{ 
   initBuffers(); 
}

} // end namespace BLOCXX_NAMESPACE