af7c8c475a
ref: - https://man7.org/linux/man-pages/man3/lsearch.3.html - https://pubs.opengroup.org/onlinepubs/009696699/functions/lsearch.html
36 lines
1.2 KiB
C++
36 lines
1.2 KiB
C++
//===-- Implementation of lfind ---------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/search/lfind.h"
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#include "src/__support/CPP/cstddef.h" // cpp::byte
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#include "src/__support/common.h"
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#include "src/__support/macros/config.h"
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#include "src/__support/memory_size.h"
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namespace LIBC_NAMESPACE_DECL {
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LLVM_LIBC_FUNCTION(void *, lfind,
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(const void *key, const void *base, size_t *nmemb,
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size_t size, int (*compar)(const void *, const void *))) {
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if (key == nullptr || base == nullptr || nmemb == nullptr ||
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compar == nullptr)
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return nullptr;
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size_t byte_len = 0;
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if (internal::mul_overflow(*nmemb, size, &byte_len))
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return nullptr;
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const cpp::byte *next = reinterpret_cast<const cpp::byte *>(base);
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const cpp::byte *end = next + byte_len;
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for (; next < end; next += size)
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if (compar(key, next) == 0)
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return const_cast<cpp::byte *>(next);
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return nullptr;
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}
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} // namespace LIBC_NAMESPACE_DECL
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