// Copyright (C) 1999,2000 Bruce Guenter <bruceg@em.ca>

//

// 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 of the License, 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 "fdbuf.h"

#include <errno.h>

#include <unistd.h>

bool fdobuf::seek(unsigned o)

{

  if(flags)

    return false;

  lock();

  unsigned buf_start = offset;

  unsigned buf_end = offset + buflength;

  if(o >= buf_start && o < buf_end) {

    bufpos = o - buf_start;

  }

  else {

    if(!nflush(false)) {

      unlock();

      return false;

    }

    if(lseek(fd, o, SEEK_SET) != (off_t)o) {

      errnum = errno;

      flags |= flag_error;

      unlock();

      return false;

    }

    offset = o;

  }

  count = 0;

  unlock();

  return true;

}