// FILE_IO.cpp
// FILE_IO.cpp,v 4.14 1999/07/03 18:26:15 schmidt Exp

#define ACE_BUILD_DLL
#include "ace/FILE_IO.h"

#if defined (ACE_LACKS_INLINE_FUNCTIONS)
#include "ace/FILE_IO.i"
#endif

ACE_RCSID(ace, FILE_IO, "FILE_IO.cpp,v 4.14 1999/07/03 18:26:15 schmidt Exp")

ACE_ALLOC_HOOK_DEFINE(ACE_FILE_IO)

void
ACE_FILE_IO::dump (void) const
{
  ACE_TRACE ("ACE_FILE_IO::dump");

  ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
  this->addr_.dump ();
  ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
}

// Simple-minded do nothing constructor.

ACE_FILE_IO::ACE_FILE_IO (void)
{
  ACE_TRACE ("ACE_FILE_IO::ACE_FILE_IO");
}

// Send N char *ptrs and int lengths.  Note that the char *'s precede
// the ints (basically, an varargs version of writev).  The count N is
// the *total* number of trailing arguments, *not* a couple of the
// number of tuple pairs!

ssize_t
ACE_FILE_IO::send (size_t n, ...) const
{
  ACE_TRACE ("ACE_FILE_IO::send");
  va_list argp;  
  size_t  total_tuples = n / 2;
  iovec *iovp;
#if defined (ACE_HAS_ALLOCA)
  iovp = (iovec *) alloca (total_tuples * sizeof (iovec));
#else
  ACE_NEW_RETURN (iovp,
                  iovec[total_tuples],
                  -1);
#endif /* !defined (ACE_HAS_ALLOCA) */

  va_start (argp, n);

  for (size_t i = 0; i < total_tuples; i++)
    {
      iovp[i].iov_base = va_arg (argp, char *);
      iovp[i].iov_len  = va_arg (argp, int);
    }

  ssize_t result = ACE_OS::writev (this->get_handle (), 
                                   iovp,
                                   total_tuples);
#if !defined (ACE_HAS_ALLOCA)
  delete [] iovp;
#endif /* !defined (ACE_HAS_ALLOCA) */
  va_end (argp);
  return result;
}

// This is basically an interface to ACE_OS::readv, that doesn't use
// the struct iovec explicitly.  The ... can be passed as an arbitrary
// number of (char *ptr, int len) tuples.  However, the count N is the
// *total* number of trailing arguments, *not* a couple of the number
// of tuple pairs!

ssize_t
ACE_FILE_IO::recv (size_t n, ...) const
{
  ACE_TRACE ("ACE_FILE_IO::recv");
  va_list argp;  
  size_t total_tuples = n / 2;
  iovec *iovp;
#if defined (ACE_HAS_ALLOCA)
  iovp = (iovec *) alloca (total_tuples * sizeof (iovec));
#else
  ACE_NEW_RETURN (iovp,
                  iovec[total_tuples],
                  -1);
#endif /* !defined (ACE_HAS_ALLOCA) */

  va_start (argp, n);

  for (size_t i = 0; i < total_tuples; i++)
    {
      iovp[i].iov_base = va_arg (argp, char *);
      iovp[i].iov_len  = va_arg (argp, int);
    }

  ssize_t result = ACE_OS::readv (this->get_handle (),
                                  iovp, 
                                  total_tuples);
#if !defined (ACE_HAS_ALLOCA)
  delete [] iovp;
#endif /* !defined (ACE_HAS_ALLOCA) */
  va_end (argp);
  return result;
}

// Allows a client to read from a file without having to provide a
// buffer to read.  This method determines how much data is in the
// file, allocates a buffer of this size, reads in the data, and
// returns the number of bytes read.

ssize_t
ACE_FILE_IO::recvv (iovec *io_vec)
{
  ACE_TRACE ("ACE_FILE_IO::recvv");

  io_vec->iov_base = 0;
  long length = ACE_OS::filesize (this->get_handle ());

  if (length > 0)
    {
      ACE_NEW_RETURN (io_vec->iov_base,
                      char[length],
                      -1);
      io_vec->iov_len = this->recv_n (io_vec->iov_base,
                                      length);
      return io_vec->iov_len;
    }
  else
    return length;
}
