| /*-*- 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/>. |
| ***/ |
| |
| |
| 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; |
| } |