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#include "ringb.h"
void ringb_init(struct ringb *ring, uint8_t *buf, int len)
{
ring->buf_len = len;
ring->buf = buf;
ring->idx_r = 0;
ring->idx_w = 0;
}
int ringb_get(struct ringb *ring) {
#if 1
int rval;
if (ring->idx_r != ring->idx_w) {
rval = ring->buf[ring->idx_r];
ring->idx_r = (ring->idx_r + 1) % ring->buf_len;
return rval;
}
return -1;
#else
if (((ring->idx_w - ring->idx_r) % ring->buf_len) >= 0) {
int rval = ring->buf[ring->idx_r];
ring->idx_r = (ring->idx_r + 1) % ring->buf_len;
return rval;
} else {
return -1;
}
#endif
}
bool ringb_put(struct ringb *ring, uint8_t c) {
#if 1
unsigned int next = (ring->idx_w + 1) % ring->buf_len;
if (next != ring->idx_r) {
ring->buf[ring->idx_w] = c;
ring->idx_w = next;
return true;
}
return false;
#else
if (((ring->idx_w - ring->idx_r) % ring->buf_len) == 0) {
return false;
}
ring->buf[ring->idx_w] = c;
ring->idx_w = (ring->idx_w + 1) % ring->buf_len;
return true;
#endif
}
void ringb_flush(struct ringb *ring) {
ring->idx_r = 0;
ring->idx_w = 0;
}
int ringb_depth(struct ringb *ring) {
return ((unsigned int)(ring->idx_w - ring->idx_r) % ring->buf_len);
}
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