#include "pmode.h"

long __pascal filecopy (WORD dst, WORD src, long size)
{
  REGSTRUCT rs;
  WORD len;
  long sizeout = 0;
  int r;

  rs.flags = rs.sp = rs.ss = 0;
  rsDS(rs) = (DWORD)_lowbufptr + database >> 4;
  rsDX(rs) = (DWORD)_lowbufptr + database & 15;

  while (size)
  {
    rsCX(rs) = len = min (size, _lowbuflen);
    rsBX(rs) = src;
    rsAH(rs) = 0x3f;

    if ((r = xlt_simrmint (0x21, &rs, 0)) < 0)
      return r;

    if (rs.flags & fCF)
      return rs.eax | 0xffff0000;

    if (!(rsCX (rs) = rsAX (rs)))
      break;

    rsBX(rs) = dst;
    rsAH(rs) = 0x40;

    if ((r = xlt_simrmint (0x21, &rs, 0)) < 0)
      return r;

    if (rs.flags & fCF)
      return rs.eax | 0xffff0000;

    sizeout += rsAX (rs);
    size -= rsAX(rs);

    if (rsAX (rs) != len)
      break;
  }

  return sizeout;
}