/*
 * wnix, a Unix-like operating system for WebAssembly applications.
 * Copyright (C) 2025  Xavier Del Campo Romero
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include <devfs.h>
#include <devfs/ops.h>
#include <devfs/types.h>
#include <fs/fs.h>
#include <errno.h>

int devfs_read_nb(const struct fs_read *const fr)
{
    struct fs_fd *const fd = fr->fd;
    const struct fs_mp *const mp = &fd->mp;
    const struct inode *const inode = fd->inode.memi;
    const struct devfs_ops *const o = devfs_ops(mp->prv, inode->name);

    if (!o)
    {
        errno = ENOENT;
        return -1;
    }

    const struct drv_event_ops *const ops = &o->ops;

    return ops->read_nb(ops->p, fr->buf, fr->n);
}
