Remove cbuf

All uses have been replaced by VecDeque.

app/src/util/cbuf.h

@@ -1,52 +0,0 @@
-// generic circular buffer (bounded queue) implementation
-#ifndef SC_CBUF_H
-#define SC_CBUF_H
-
-#include "common.h"
-
-#include <stdbool.h>
-#include <unistd.h>
-
-// To define a circular buffer type of 20 ints:
-//     struct cbuf_int CBUF(int, 20);
-//
-// data has length CAP + 1 to distinguish empty vs full.
-#define CBUF(TYPE, CAP) { \
-    TYPE data[(CAP) + 1]; \
-    size_t head; \
-    size_t tail; \
-}
-
-#define cbuf_size_(PCBUF) \
-    (sizeof((PCBUF)->data) / sizeof(*(PCBUF)->data))
-
-#define cbuf_is_empty(PCBUF) \
-    ((PCBUF)->head == (PCBUF)->tail)
-
-#define cbuf_is_full(PCBUF) \
-    (((PCBUF)->head + 1) % cbuf_size_(PCBUF) == (PCBUF)->tail)
-
-#define cbuf_init(PCBUF) \
-    (void) ((PCBUF)->head = (PCBUF)->tail = 0)
-
-#define cbuf_push(PCBUF, ITEM) \
-    ({ \
-        bool ok = !cbuf_is_full(PCBUF); \
-        if (ok) { \
-            (PCBUF)->data[(PCBUF)->head] = (ITEM); \
-            (PCBUF)->head = ((PCBUF)->head + 1) % cbuf_size_(PCBUF); \
-        } \
-        ok; \
-    })
-
-#define cbuf_take(PCBUF, PITEM) \
-    ({ \
-        bool ok = !cbuf_is_empty(PCBUF); \
-        if (ok) { \
-            *(PITEM) = (PCBUF)->data[(PCBUF)->tail]; \
-            (PCBUF)->tail = ((PCBUF)->tail + 1) % cbuf_size_(PCBUF); \
-        } \
-        ok; \
-    })
-
-#endif