libexplain/iocontrol/request_by_number.c

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/*
 * libexplain - Explain errno values returned by libc functions
 * Copyright (C) 2009, 2010, 2013 Peter Miller
 * Written by Peter Miller <pmiller@opensource.org.au>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <libexplain/ac/sys/ioctl.h>
#include <libexplain/iocontrol/generic.h>
#include <libexplain/iocontrol/table.h>


const explain_iocontrol_t *
explain_iocontrol_find_by_number(int fildes, int request,
    const void *data)
{
    const explain_iocontrol_t *const *tpp;
    const explain_iocontrol_t *const *end;

    end = explain_iocontrol_table + explain_iocontrol_table_size;
    for (tpp = explain_iocontrol_table; tpp < end; ++tpp)
    {
        const explain_iocontrol_t *tp;

        tp = *tpp;
        if
        (
            request == tp->number
        &&
            (tp->print_name || tp->name)
        &&
            (
                !tp->disambiguate
            ||
                0 == tp->disambiguate(fildes, request, data)
            )
        )
        {
            return tp;
        }
    }
    return &explain_iocontrol_generic;
}


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