40 lines · cpp
1//===-- Implementation of lsearch -------------------------------*- 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/lsearch.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#include "src/string/memory_utils/inline_memcpy.h"15 16namespace LIBC_NAMESPACE_DECL {17LLVM_LIBC_FUNCTION(void *, lsearch,18 (const void *key, void *base, size_t *nmemb, size_t size,19 int (*compar)(const void *, const void *))) {20 if (key == nullptr || base == nullptr || nmemb == nullptr ||21 compar == nullptr)22 return nullptr;23 24 size_t byte_len = 0;25 if (internal::mul_overflow(*nmemb, size, &byte_len))26 return nullptr;27 28 const cpp::byte *next = reinterpret_cast<const cpp::byte *>(base);29 const cpp::byte *end = next + byte_len;30 for (; next < end; next += size)31 if (compar(key, next) == 0)32 return const_cast<cpp::byte *>(next);33 34 *nmemb += 1;35 inline_memcpy(const_cast<cpp::byte *>(end), key, size);36 return const_cast<cpp::byte *>(end);37}38 39} // namespace LIBC_NAMESPACE_DECL40