/*-*- 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; }