ringbuf.c

#include <rtdm/rtdm.h>
#include <rtdm/rtdm_driver.h>

#include "ringbuf.h"

void ringBufS_init (ringBufS *_this)
{
    /*****
      The following clears:
        -> buf
        -> head
        -> tail
        -> count
      and sets head = tail
    ***/
    memset (_this, 0, sizeof (*_this));

    _this->buf = rtdm_malloc(RBUF_SIZE);
}

void  ringBufS_free  (ringBufS *_this){
	rtdm_free(_this->buf);
}

int ringBufS_empty (ringBufS *_this)
{
    return (0==_this->count);
}

int ringBufS_full (ringBufS *_this)
{
    return (_this->count >= RBUF_SIZE);
}

char ringBufS_get (ringBufS *_this)
{
    char c;

    if (_this->count>0)
    {
      c           = _this->buf[_this->tail];
      _this->tail = (_this->tail+1) % RBUF_SIZE;
      --_this->count;
    }
    else
    {
      c = -1;
    }

    return (c);
}

void ringBufS_put (ringBufS *_this, const char c)
{
    if (_this->count < RBUF_SIZE)
    {
      _this->buf[_this->head] = c;
      _this->head = (_this->head + 1) % RBUF_SIZE;
      ++_this->count;
    }
}

void ringBufS_flush (ringBufS *_this, const int clearBuffer)
{
  _this->count  = 0;
  _this->head   = 0;
  _this->tail   = 0;
  if (clearBuffer)
  {
    memset (_this->buf, 0, sizeof (_this->buf));
  }
}