38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
//===-- Implementation of wcsncmp -----------------------------------------===//
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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/wchar/wcsncmp.h"
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#include "hdr/types/size_t.h"
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#include "hdr/types/wchar_t.h"
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#include "src/__support/common.h"
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#include "src/__support/macros/null_check.h"
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namespace LIBC_NAMESPACE_DECL {
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LLVM_LIBC_FUNCTION(int, wcsncmp,
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(const wchar_t *left, const wchar_t *right, size_t n)) {
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LIBC_CRASH_ON_NULLPTR(left);
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LIBC_CRASH_ON_NULLPTR(right);
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if (n == 0)
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return 0;
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auto comp = [](wchar_t l, wchar_t r) -> int { return l - r; };
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for (; n > 1; --n, ++left, ++right) {
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wchar_t lc = *left;
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if (!comp(lc, '\0') || comp(lc, *right))
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break;
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}
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return comp(*reinterpret_cast<const wchar_t *>(left),
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*reinterpret_cast<const wchar_t *>(right));
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}
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} // namespace LIBC_NAMESPACE_DECL
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