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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | #pragma once | |
4 | ||
5 | /*** | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2014 David Herrmann <dh.herrmann@gmail.com> | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
11 | under the terms of the GNU Lesser General Public License as published by | |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | Lesser General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU Lesser General Public License | |
21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
22 | ***/ | |
23 | ||
60f067b4 | 24 | |
5eef597e MP |
25 | typedef struct Ring Ring; |
26 | ||
27 | struct Ring { | |
60f067b4 JS |
28 | uint8_t *buf; /* buffer or NULL */ |
29 | size_t size; /* actual size of @buf */ | |
30 | size_t start; /* start position of ring */ | |
31 | size_t used; /* number of actually used bytes */ | |
32 | }; | |
33 | ||
34 | /* flush buffer so it is empty again */ | |
5eef597e | 35 | void ring_flush(Ring *r); |
60f067b4 JS |
36 | |
37 | /* flush buffer, free allocated data and reset to initial state */ | |
5eef597e | 38 | void ring_clear(Ring *r); |
60f067b4 JS |
39 | |
40 | /* get pointers to buffer data and their length */ | |
5eef597e | 41 | size_t ring_peek(Ring *r, struct iovec *vec); |
60f067b4 JS |
42 | |
43 | /* copy data into external linear buffer */ | |
5eef597e | 44 | size_t ring_copy(Ring *r, void *buf, size_t size); |
60f067b4 JS |
45 | |
46 | /* push data to the end of the buffer */ | |
5eef597e | 47 | int ring_push(Ring *r, const void *u8, size_t size); |
60f067b4 JS |
48 | |
49 | /* pull data from the front of the buffer */ | |
5eef597e | 50 | void ring_pull(Ring *r, size_t size); |
60f067b4 JS |
51 | |
52 | /* return size of occupied buffer in bytes */ | |
d9dfd233 | 53 | static inline size_t ring_get_size(Ring *r) { |
60f067b4 JS |
54 | return r->used; |
55 | } |