Prevent UB on memcpy and floating point conversions

- add `memcpy_no_ub` that accepts null pointers for 0 count
- prevent 0 length allocation in `js_worker_postMessage`
- use safer test for `int` value in `JS_NewFloat64`,
  `JS_ToArrayLengthFree` and `js_typed_array_indexOf`

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/quickjs/libbf.c b/lib/quickjs/libbf.c
index a7d36c28..7f497a85 100644
--- a/lib/quickjs/libbf.c
+++ b/lib/quickjs/libbf.c
@@ -311,7 +311,7 @@ int bf_set(bf_t *r, const bf_t *a)
     }
     r->sign = a->sign;
     r->expn = a->expn;
-    memcpy(r->tab, a->tab, a->len * sizeof(limb_t));
+    memcpy_no_ub(r->tab, a->tab, a->len * sizeof(limb_t));
     return 0;
 }