#include "circ_buf.h"

void buffer_init(volatile circular_buffer_t* b){
    b->count = 0;
    b->head = 0;
    b->tail = 0;
}

uint8_t buffer_is_full(volatile circular_buffer_t* b){
    return b->count == BUFFER_SIZE;
}

uint8_t buffer_is_empty(volatile circular_buffer_t* b){
    return b->count == 0;
}

uint8_t buffer_enqueue(volatile circular_buffer_t* b, char c){
    if(buffer_is_full(b))
        return 0;
    b->data[b->head] = c;
    b->head = (b->head+1)%BUFFER_SIZE;
    b->count++;
    return 1;
}

uint8_t buffer_dequeue(volatile circular_buffer_t* b, char* c){
    if(buffer_is_empty(b))
        return 0;
    *c = b->data[b->tail];
    b->tail = (b->tail+1)%BUFFER_SIZE;
    b->count--;
    return 1;
}