1ca5fd003f
We use "typedef struct Ring Ring" with camel-case for internal objects. So rename "struct ring" to "Ring".
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*-*- 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>
|
|
|
|
typedef struct Ring Ring;
|
|
|
|
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(Ring *r);
|
|
|
|
/* flush buffer, free allocated data and reset to initial state */
|
|
void ring_clear(Ring *r);
|
|
|
|
/* get pointers to buffer data and their length */
|
|
size_t ring_peek(Ring *r, struct iovec *vec);
|
|
|
|
/* copy data into external linear buffer */
|
|
size_t ring_copy(Ring *r, void *buf, size_t size);
|
|
|
|
/* push data to the end of the buffer */
|
|
int ring_push(Ring *r, const void *u8, size_t size);
|
|
|
|
/* pull data from the front of the buffer */
|
|
void ring_pull(Ring *r, size_t size);
|
|
|
|
/* return size of occupied buffer in bytes */
|
|
static inline size_t ring_get_size(Ring *r)
|
|
{
|
|
return r->used;
|
|
}
|