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/*
* Karl Palsson <karlp@tweak.net.au>
* Considered to be released under your choice of:
* MIT/ISC/Apache2/BSD2Clause/GPLv2
* If you're looking for elegant compact performance you've come to the wrong
* place hombre.
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#include <stdbool.h>
#include <stdint.h>
struct ringb {
volatile unsigned int idx_r;
volatile unsigned int idx_w;
uint8_t *buf;
int buf_len;
};
/**
* Load up a ring buffer. Always suceeds
* @param ring struct saving state, provided by the user
* @param buf where the data will be kept
* @param len size of buf in in elements.
*/
void ringb_init(struct ringb *ring, uint8_t *buf, int len);
/**
* push data in
* @param ring
* @param c
* @return true if space was available
*/
bool ringb_put(struct ringb *ring, uint8_t c);
/**
* pull data out
* @param ring
* @return -1 for no data, uint8_t range for valid.
*/
int ringb_get(struct ringb *ring);
/**
* Toss data and reset to empty
* @param ring
*/
void ringb_flush(struct ringb *ring);
int ringb_depth(struct ringb *ring);
#ifdef __cplusplus
}
#endif
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