[libc-commits] [libc] [libc] fuzz test for heap_sort (PR #100826)

[via libc-commits]

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@@ -0,0 +1,53 @@
+//===-- heap_sort_fuzz.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// Fuzzing test for llvm-libc heap_sort implementation.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/stdlib/heap_sort.h"
+#include <stdint.h>
+
+static int int_compare(const void *l, const void *r) {
+  int li = *reinterpret_cast<const int *>(l);
+  int ri = *reinterpret_cast<const int *>(r);
+  if (li == ri)
+    return 0;
+  else if (li > ri)
+    return 1;
+  else
+    return -1;
+}
+
+namespace LIBC_NAMESPACE_DECL {
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
----------------
overmighty wrote:

You shouldn't use the `__llvm_libc_*` namespace directly, we have the `LIBC_NAMESPACE_DECL` macro for declaring things in the LLVM libc namespace, and the `LIBC_NAMESPACE` macro for using things from the namespace.

This works:

```cpp
  auto arr = LIBC_NAMESPACE::internal::Array(
      reinterpret_cast<uint8_t *>(array), array_size, sizeof(int), int_compare);

  LIBC_NAMESPACE::internal::heap_sort(arr);
```

https://github.com/llvm/llvm-project/pull/100826