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//===-- Implementation of lsearch -------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "src/search/lsearch.h"
#include "src/__support/CPP/cstddef.h" // cpp::byte
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/__support/memory_size.h"
#include "src/string/memory_utils/inline_memcpy.h"
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(void *, lsearch,
(const void *key, void *base, size_t *nmemb, size_t size,
int (*compar)(const void *, const void *))) {
if (key == nullptr || base == nullptr || nmemb == nullptr ||
compar == nullptr)
return nullptr;
size_t byte_len = 0;
if (internal::mul_overflow(*nmemb, size, &byte_len))
return nullptr;
const cpp::byte *next = reinterpret_cast<const cpp::byte *>(base);
const cpp::byte *end = next + byte_len;
for (; next < end; next += size)
if (compar(key, next) == 0)
return const_cast<cpp::byte *>(next);
*nmemb += 1;
inline_memcpy(const_cast<cpp::byte *>(end), key, size);
return const_cast<cpp::byte *>(end);
}
} // namespace LIBC_NAMESPACE_DECL
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