lib/input/file.cc

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//
// nis-util - NIS Administration Utilities
// Copyright (C) 2012 Peter Miller
//
// 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, see <http://www.gnu.org/licenses/>.
//

#include <lib/ac/fcntl.h>
#include <libexplain/close.h>
#include <libexplain/open.h>
#include <libexplain/read.h>

#include <lib/input/file.h>
#include <lib/input/stdin.h>


input_file::~input_file()
{
    if (fd >= 0)
    {
        if (fd != 0)
            explain_close_or_die(fd);
        fd = -1;
    }
}


input_file::input_file(const rcstring &a_filename) :
    filename(a_filename),
    line_number(1),
    fd(explain_open_or_die(a_filename.c_str(), O_RDONLY, 0))
{
    assert(fd >= 0);
}


input::pointer
input_file::create(const rcstring &filename)
{
    if (input_stdin::candidate(filename))
        return input_stdin::create();
    return pointer(new input_file(filename));
}


size_t
input_file::read_inner(source_location &data_locn, void *data, size_t data_size)
{
    if (fd < 0)
        return 0;
    data_locn = source_location(filename, line_number);
    size_t nbytes = explain_read_or_die(fd, data, data_size);
    line_number += count_newlines(data, nbytes);
    return nbytes;
}


// vim: set ts=8 sw=4 et :