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