Remove cbuf

All uses have been replaced by VecDeque.

app/tests/test_cbuf.c

@@ -1,78 +0,0 @@
-#include "common.h"
-
-#include <assert.h>
-#include <string.h>
-
-#include "util/cbuf.h"
-
-struct int_queue CBUF(int, 32);
-
-static void test_cbuf_empty(void) {
-    struct int_queue queue;
-    cbuf_init(&queue);
-
-    assert(cbuf_is_empty(&queue));
-
-    bool push_ok = cbuf_push(&queue, 42);
-    assert(push_ok);
-    assert(!cbuf_is_empty(&queue));
-
-    int item;
-    bool take_ok = cbuf_take(&queue, &item);
-    assert(take_ok);
-    assert(cbuf_is_empty(&queue));
-
-    bool take_empty_ok = cbuf_take(&queue, &item);
-    assert(!take_empty_ok); // the queue is empty
-}
-
-static void test_cbuf_full(void) {
-    struct int_queue queue;
-    cbuf_init(&queue);
-
-    assert(!cbuf_is_full(&queue));
-
-    // fill the queue
-    for (int i = 0; i < 32; ++i) {
-        bool ok = cbuf_push(&queue, i);
-        assert(ok);
-    }
-    bool ok = cbuf_push(&queue, 42);
-    assert(!ok); // the queue if full
-
-    int item;
-    bool take_ok = cbuf_take(&queue, &item);
-    assert(take_ok);
-    assert(!cbuf_is_full(&queue));
-}
-
-static void test_cbuf_push_take(void) {
-    struct int_queue queue;
-    cbuf_init(&queue);
-
-    bool push1_ok = cbuf_push(&queue, 42);
-    assert(push1_ok);
-
-    bool push2_ok = cbuf_push(&queue, 35);
-    assert(push2_ok);
-
-    int item;
-
-    bool take1_ok = cbuf_take(&queue, &item);
-    assert(take1_ok);
-    assert(item == 42);
-
-    bool take2_ok = cbuf_take(&queue, &item);
-    assert(take2_ok);
-    assert(item == 35);
-}
-
-int main(int argc, char *argv[]) {
-    (void) argc;
-    (void) argv;
-
-    test_cbuf_empty();
-    test_cbuf_full();
-    test_cbuf_push_take();
-    return 0;
-}