posix/lib/psxdll/unistd/write.c

   1 /* $Id: write.c,v 1.3 2002/03/21 22:46:30 hyperion Exp $
   2  */
   3 /*
   4  * COPYRIGHT:   See COPYING in the top level directory
   5  * PROJECT:     ReactOS POSIX+ Subsystem
   6  * FILE:        subsys/psx/lib/psxdll/unistd/write.c
   7  * PURPOSE:     Write on a file
   8  * PROGRAMMER:  KJK::Hyperion <noog@libero.it>
   9  * UPDATE HISTORY:
  10  *              15/02/2002: Created
  11  *              21/03/2002: Implemented write() (KJK::Hyperion <noog@libero.it>)
  12  */
  13
  14 #include <ddk/ntddk.h>
  15 #include <fcntl.h>
  16 #include <unistd.h>
  17 #include <sys/types.h>
  18 #include <psx/debug.h>
  19 #include <psx/errno.h>
  20 #include <psx/fdtable.h>
  21
  22 ssize_t write(int fildes, const void *buf, size_t nbyte)
  23 {
  24  __fildes_t      fdDescriptor;
  25  NTSTATUS        nErrCode;
  26  IO_STATUS_BLOCK isbStatus;
  27
  28  if(nbyte == 0)
  29   return (0);
  30
  31  if(fcntl(fildes, F_GETALL, &fdDescriptor) == -1)
  32   return (0);
  33
  34  if((fdDescriptor.OpenFlags && O_APPEND) == O_APPEND)
  35  {
  36   TODO("move file pointer to the end");
  37  }
  38
  39  nErrCode = NtWriteFile
  40  (
  41   fdDescriptor.FileHandle,
  42   NULL,
  43   NULL,
  44   NULL,
  45   &isbStatus,
  46   (PVOID)buf,
  47   nbyte,
  48   NULL,
  49   NULL
  50  );
  51
  52  if(!NT_SUCCESS(nErrCode))
  53  {
  54   errno = __status_to_errno(nErrCode);
  55   return (0);
  56  }
  57
  58  return (isbStatus.Information);
  59 }
  60
  61 /* EOF */
  62