32 lines · cpp
1//===-- Implementation of wcsncpy -----------------------------------------===//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/wcsncpy.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/config.h"15 16namespace LIBC_NAMESPACE_DECL {17 18LLVM_LIBC_FUNCTION(wchar_t *, wcsncpy,19 (wchar_t *__restrict s1, const wchar_t *__restrict s2,20 size_t n)) {21 size_t i = 0;22 // Copy up until \0 is found.23 for (; i < n && s2[i] != L'\0'; ++i)24 s1[i] = s2[i];25 // When s2 is shorter than n, append \0.26 for (; i < n; ++i)27 s1[i] = L'\0';28 return s1;29}30 31} // namespace LIBC_NAMESPACE_DECL32