/*
 * libexplain - Explain errno values returned by libc functions
 * Copyright (C) 2009, 2011 Peter Miller
 *
 * 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/uio.h>

#include <libexplain/buffer/iovec.h>
#include <libexplain/buffer/pointer.h>
#include <libexplain/buffer/size_t.h>
#include <libexplain/is_efault.h>


void
explain_buffer_iovec(explain_string_buffer_t *sb, const struct iovec *data,
    int data_size)
{
    int                 j;

    if
    (
        data_size <= 0
    ||
        explain_is_efault_pointer(data, data_size * sizeof(*data))
    )
    {
        explain_buffer_pointer(sb, data);
        return;
    }

    if (data_size > 1)
        explain_string_buffer_putc(sb, '{');
    for (j = 0; j < data_size; ++j)
    {
        const struct iovec *p;

        p = data + j;
        if (j)
            explain_string_buffer_puts(sb, ", ");
        explain_string_buffer_puts(sb, "{ ");
        explain_buffer_pointer(sb, p->iov_base);
        explain_string_buffer_puts(sb, ", ");
        explain_buffer_size_t(sb, p->iov_len);
        explain_string_buffer_puts(sb, " }");
    }
    if (data_size > 1)
        explain_string_buffer_putc(sb, '}');
}
