src/truncate.c

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/*
     This file is part of PlibC.
     (C) 2005 Nils Durner (and other contributing authors)

           This library is free software; you can redistribute it and/or
           modify it under the terms of the GNU Lesser General Public
           License as published by the Free Software Foundation; either
           version 2.1 of the License, or (at your option) any later version.
        
           This library is distributed in the hope that it will be useful,
           but WITHOUT ANY WARRANTY; without even the implied warranty of
           MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
           Lesser General Public License for more details.
        
           You should have received a copy of the GNU Lesser General Public
           License along with this library; if not, write to the Free Software
           Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "plibc_private.h"

int truncate(const char *fname, int distance)
{
  int i;
  HANDLE hFile;
  char pszFile[_MAX_PATH + 1];
  long lRet;

  errno = 0;

  if ((lRet = plibc_conv_to_win_path(fname, pszFile)) != ERROR_SUCCESS)
  {
    SetErrnoFromWinError(lRet);
    return -1;
  }

  i = -1;
  hFile = CreateFile(pszFile, GENERIC_READ | GENERIC_WRITE,
                     FILE_SHARE_READ | FILE_SHARE_WRITE,
                     NULL, OPEN_EXISTING,
                     FILE_ATTRIBUTE_NORMAL | FILE_FLAG_RANDOM_ACCESS, NULL);
  if(hFile != INVALID_HANDLE_VALUE)
  {
    if(SetFilePointer(hFile, distance, NULL, FILE_BEGIN) != 0xFFFFFFFF)
    {
      if(SetEndOfFile(hFile))
        i = 0;
    }
    CloseHandle(hFile);
  }

  return i;
}

/* end of truncate.c */

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