| 1 | //===-- Implementation of lsearch -------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/search/lsearch.h" |
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| 10 | #include "src/__support/CPP/cstddef.h" // cpp::byte |
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| 11 | #include "src/__support/common.h" |
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| 12 | #include "src/__support/macros/config.h" |
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| 13 | #include "src/__support/memory_size.h" |
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| 14 | #include "src/string/memory_utils/inline_memcpy.h" |
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| 15 | |
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| 16 | namespace LIBC_NAMESPACE_DECL { |
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| 17 | LLVM_LIBC_FUNCTION(void *, lsearch, |
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| 18 | (const void *key, void *base, size_t *nmemb, size_t size, |
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| 19 | int (*compar)(const void *, const void *))) { |
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| 20 | if (key == nullptr || base == nullptr || nmemb == nullptr || |
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| 21 | compar == nullptr) |
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| 22 | return nullptr; |
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| 23 | |
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| 24 | size_t byte_len = 0; |
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| 25 | if (internal::mul_overflow(*nmemb, size, &byte_len)) |
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| 26 | return nullptr; |
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| 27 | |
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| 28 | const cpp::byte *next = reinterpret_cast<const cpp::byte *>(base); |
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| 29 | const cpp::byte *end = next + byte_len; |
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| 30 | for (; next < end; next += size) |
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| 31 | if (compar(key, next) == 0) |
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| 32 | return const_cast<cpp::byte *>(next); |
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| 33 | |
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| 34 | *nmemb += 1; |
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| 35 | inline_memcpy(const_cast<cpp::byte *>(end), key, size); |
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| 36 | return const_cast<cpp::byte *>(end); |
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| 37 | } |
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| 38 | |
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| 39 | } // namespace LIBC_NAMESPACE_DECL |
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| 40 | |
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