charring.c

Go to the documentation of this file.

#include "charring.h"
#include <stdlib.h>


CharRingBuf *CharRing_new(int16_t len)
{
    CharRingBuf *buffer = calloc(1, sizeof(*buffer));
    buffer->len = len;
    buffer->buf = calloc(buffer->len, sizeof(buffer->buf));

    return buffer;
}


void CharRing_free(CharRingBuf *b)
{
    free(b->buf);
    free(b);
}


void CharRing_putchar(CharRingBuf *b, char c)
{
    if (CharRing_full(b)) {
        /* buffer is full, read out char to make room */
        CharRing_getchar(b);
    }
    b->buf[b->head] = c;
    b->head++;
    b->head %= b->len;
    b->count++;
}


char CharRing_getchar(CharRingBuf *b)
{
    char c = 0;
    if (CharRing_available(b)) {
        c = b->buf[b->tail];
        b->tail++;
        b->tail %= b->len;
        b->count--;
    }
    return c;
}