37 lines · cpp
1//===-- Implementation of wcsncmp -----------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/wchar/wcsncmp.h"10 11#include "hdr/types/size_t.h"12#include "hdr/types/wchar_t.h"13#include "src/__support/common.h"14#include "src/__support/macros/null_check.h"15 16namespace LIBC_NAMESPACE_DECL {17 18LLVM_LIBC_FUNCTION(int, wcsncmp,19 (const wchar_t *left, const wchar_t *right, size_t n)) {20 LIBC_CRASH_ON_NULLPTR(left);21 LIBC_CRASH_ON_NULLPTR(right);22 23 if (n == 0)24 return 0;25 26 auto comp = [](wchar_t l, wchar_t r) -> int { return l - r; };27 28 for (; n > 1; --n, ++left, ++right) {29 wchar_t lc = *left;30 if (!comp(lc, '\0') || comp(lc, *right))31 break;32 }33 return comp(*left, *right);34}35 36} // namespace LIBC_NAMESPACE_DECL37