arm9/source/types/circbuf.c


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#include "circbuf.h"


// Read a byte from a circular buffer, or zero if the buffer is empty.
u8 circbuf_read(CircBuf *buf) {
    if (buf->front != buf->back) {
        return buf->mem[buf->front++];
    } else {
        return 0;
    }
}

// Write a byte to a circular buffer if the buffer is not full.
void circbuf_write(CircBuf *buf, u8 byte) {
    if (((buf->back+1)&0xff) != buf->front) {
        buf->mem[buf->back++] = byte;
    }
}

// Clear a circular buffer.
void circbuf_clear(CircBuf *buf) {
    buf->front = 0;
    buf->back = 0;
}