Function dynbuf_init

internal/cbm/sqlite_writer.c:295–299

} DynBuf;

static void dynbuf_init(DynBuf *b) {
    b->data = NULL;
    b->len = 0;
    b->cap = 0;
}

static bool dynbuf_ensure(DynBuf *b, int needed) {
    if (b->len + needed <= b->cap) {