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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#pragma once
/***
This file is part of systemd.
Copyright 2014 David Herrmann <dh.herrmann@gmail.com>
systemd 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 2.1 of the License, or
(at your option) any later version.
systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <sys/uio.h>
struct ring {
uint8_t *buf; /* buffer or NULL */
size_t size; /* actual size of @buf */
size_t start; /* start position of ring */
size_t used; /* number of actually used bytes */
};
/* flush buffer so it is empty again */
void ring_flush(struct ring *r);
/* flush buffer, free allocated data and reset to initial state */
void ring_clear(struct ring *r);
/* get pointers to buffer data and their length */
size_t ring_peek(struct ring *r, struct iovec *vec);
/* copy data into external linear buffer */
size_t ring_copy(struct ring *r, void *buf, size_t size);
/* push data to the end of the buffer */
int ring_push(struct ring *r, const void *u8, size_t size);
/* pull data from the front of the buffer */
void ring_pull(struct ring *r, size_t size);
/* return size of occupied buffer in bytes */
static inline size_t ring_get_size(struct ring *r)
{
return r->used;
}
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