//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:       Buffer library                                                //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2019 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K 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 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K 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 OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#include <lib/buf.h>

//
// Erases buf's content
// Can be given as a flusher
//
error_t bemptybuf(Buffer_t *buf)
{
    buf->wp = buf->rp = buf->buf;
    buf->lastLF = 0;
    
    return EOK;
}

//
// Flushes a buffer, returns EBADF when not possible
//
error_t BFlushBuf(Buffer_t *buf)
{
    error_t rc;

    if (!buf) return EINVAL;
    if (buf->flags & (BF_EOF|BF_ERR)) {
        return EENDF;
    }
    if (!buf->flusher) {
        return EBADF;
    }

    ExAcquireLock(&buf->lock);
    rc = buf->flusher(buf);
    ExReleaseLock(&buf->lock);

    return rc;
}