// Copyright 2023 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

#include "pw_allocator/libc_allocator.h"

#include <algorithm>
#include <cstddef>
#include <cstdlib>
#include <cstring>

namespace pw::allocator {

void* LibCAllocator::DoAllocate(Layout layout) {
  // TODO: b/301930507 - `aligned_alloc` is not portable. Return null for larger
  // allocations for now.
  return layout.alignment() <= alignof(std::max_align_t)
             ? std::malloc(layout.size())
             : nullptr;
}

void LibCAllocator::DoDeallocate(void* ptr) { std::free(ptr); }

void* LibCAllocator::DoReallocate(void* ptr, Layout new_layout) {
  // TODO: b/301930507 - `aligned_alloc` is not portable. Return null for larger
  // allocations for now.
  return new_layout.alignment() <= alignof(std::max_align_t)
             ? std::realloc(ptr, new_layout.size())
             : nullptr;
}

LibCAllocator& GetLibCAllocator() {
  static LibCAllocator kInstance;
  return kInstance;
}

}  // namespace pw::allocator