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normal.cc

/*
 *    tardy - a tar post-processor
 *    Copyright (C) 1998, 1999, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    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, USA.
 *
 * MANIFEST: functions to manipulate file input normals
 */

#include <ac/unistd.h>
#include <ac/fcntl.h>
#include <file/input/normal.h>


00028 file_input_normal::~file_input_normal()
{
      if (fd >= 0 && ::close(fd))
            nfatal("close");
}


00035 file_input_normal::file_input_normal()
      : fn(), fd(-1)
{
      fatal("default constructor is private (bug)");
}


00042 file_input_normal::file_input_normal(const char *arg)
      : fn(arg), fd(-1)
{
      fd = ::open(arg, O_RDONLY);
      if (fd < 0)
            nfatal("cannot open");
}


00051 file_input_normal::file_input_normal(const file_input_normal &arg)
      : fn(arg.fn), fd(-1)
{
      fd = dup(arg.fd);
      if (fd < 0)
            arg.nfatal("dup");
}


file_input_normal &
00061 file_input_normal::operator = (const file_input_normal &arg)
{
      if (fd >= 0 && close(fd))
            nfatal("close");
      fn = arg.fn;
      fd = dup(arg.fd);
      if (fd < 0)
            arg.nfatal("dup");
      return *this;
}


int
00074 file_input_normal::read(void *buffer, int maximum_length)
      const
{
      int nbytes = ::read(fd, buffer, maximum_length);
      if (nbytes < 0)
            nfatal("read");
      return nbytes;
}


const char *
00085 file_input_normal::filename()
      const
{
      return fn;
}

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