36 lines · cpp
1//===-- Implementation of lfind ---------------------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/search/lfind.h"10#include "src/__support/CPP/cstddef.h" // cpp::byte11#include "src/__support/common.h"12#include "src/__support/macros/config.h"13#include "src/__support/memory_size.h"14 15namespace LIBC_NAMESPACE_DECL {16LLVM_LIBC_FUNCTION(void *, lfind,17 (const void *key, const void *base, size_t *nmemb,18 size_t size, int (*compar)(const void *, const void *))) {19 if (key == nullptr || base == nullptr || nmemb == nullptr ||20 compar == nullptr)21 return nullptr;22 23 size_t byte_len = 0;24 if (internal::mul_overflow(*nmemb, size, &byte_len))25 return nullptr;26 27 const cpp::byte *next = reinterpret_cast<const cpp::byte *>(base);28 const cpp::byte *end = next + byte_len;29 for (; next < end; next += size)30 if (compar(key, next) == 0)31 return const_cast<cpp::byte *>(next);32 return nullptr;33}34 35} // namespace LIBC_NAMESPACE_DECL36