| // Copyright 2021 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #include <stdint.h> |
| |
| #include <ktl/align.h> |
| #include <ktl/byte.h> |
| |
| // This has to be defined as std:: rather than ktl:: because we are providing a |
| // definition to replace libc++'s, to which ktl::align is aliased. |
| void* std::align(size_t alignment, size_t size, void*& ptr, size_t& space) { |
| if (size > space) { |
| return nullptr; |
| } |
| uintptr_t addr = reinterpret_cast<uintptr_t>(ptr); |
| uintptr_t aligned_addr = (addr + alignment - 1) & -alignment; |
| size_t skipped = aligned_addr - addr; |
| if (skipped > space - size) { |
| return nullptr; |
| } |
| ptr = reinterpret_cast<void*>(aligned_addr); |
| space -= skipped; |
| return ptr; |
| } |
