src/add-ons/kernel/file_systems/googlefs/ringbuff.h

   1 /*
   2  * Copyright 2004-2008, François Revol, <revol@free.fr>.
   3  * Distributed under the terms of the MIT License.
   4  */
   5 #ifndef _RINGBUFF_H
   6 #define _RINGBUFF_H
   7
   8 struct ring_buffer {
   9         size_t size;
  10         size_t current; /* index of next byte to read */
  11         size_t avail;   /* number of bytes in */
  12         unsigned char data[0];
  13 };
  14
  15 void rb_init(struct ring_buffer *rb, size_t size);
  16 void rb_clear(struct ring_buffer *rb);
  17 size_t rb_can_write(struct ring_buffer *rb);
  18 size_t rb_can_read(struct ring_buffer *rb);
  19 size_t rb_write(struct ring_buffer *rb, void *data, size_t len);
  20 size_t rb_read(struct ring_buffer *rb, void *data, size_t len);
  21
  22 #endif