lib/input.h

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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/>.
//

#ifndef LIB_INPUT_H
#define LIB_INPUT_H

#include <lib/ac/stddef.h>
#include <boost/shared_ptr.hpp>
#include <lib/source_location.h>

class input
{
public:
    typedef boost::shared_ptr<input> pointer;

    virtual ~input();

    static const int eof = -1;

    int
    get(void)
    {
        if (pos >= avail)
            return underflow();
        unsigned char c = buf[pos++];
        if (c == '\n')
            ++relative_line_number;
        return c;
    }

    void unget(int c);

    source_location get_source_location(void);

    bool read_one_line(source_location &line_locn, rcstring &line);

protected:
    input();

    static int count_newlines(const void *data, size_t data_size);

private:
    int underflow(void);

    unsigned char *buf;

    size_t buf_allocated;

    size_t pos;

    size_t avail;

    long relative_line_number;

    virtual size_t read_inner(source_location &data_locn, void *data,
        size_t data_size) = 0;

    source_location buf_locn;

    void refill(void);

    input(const input &rhs);

    input &operator=(const input &rhs);
};

// vim: set ts=8 sw=4 et :
#endif // LIB_INPUT_H