/* $Id: tempfile.C,v 1.1 1999/09/28 02:40:22 dm Exp $ */

/*
 *
 * Copyright (C) 1999 David Mazieres (dm@uun.org)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2, or (at
 * your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 */

#include "tempfile.h"

tempfile::tempfile (const str &p, mode_t mode)
  : err (0), path (p)
{
  if (path) {
    fd = open (path, O_CREAT|O_EXCL|O_WRONLY, mode);
    if (fd < 0)
      err = errno;
  }
  else {
    fd = -1;
    err = EINVAL;
  }
}

void
tempfile::destroy ()
{
  if (fd >= 0) {
    close (fd);
    unlink (path);
  }
  fd = -1;
}

void
tempfile::flush (bool force)
{
  if (err)
    buf.tosuio ()->clear ();
  else if ((force || buf.tosuio ()->resid () >= 8192)
	   && buf.tosuio ()->output (fd) < 0) {
    err = errno;
    destroy ();
  }
  else if (force && buf.tosuio ()->resid ()) {
    err = EAGAIN;
    destroy ();
  }
}

bool
tempfile::rename (str dest)
{
  flush (true);
  int oerr = err;
  err = EINVAL;
  if (oerr) {
    destroy ();
    errno = oerr;
    return false;
  }

  int ofd = fd;
  fd = -1;
  if (fsync (ofd) < 0) {
    int saved_errno = errno;
    close (ofd);
    unlink (path);
    errno = saved_errno;
    return false;
  }

  if (close (ofd) < 0 || ::rename (path, dest) < 0) {
    int saved_errno = errno;
    unlink (path);
    errno = saved_errno;
    return false;
  }
  return true;
}