40 lines · cpp
1//===-- Implementation of wcslcat -----------------------------------------===//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/wcslcat.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#include "src/string/string_utils.h"16 17namespace LIBC_NAMESPACE_DECL {18 19LLVM_LIBC_FUNCTION(size_t, wcslcat,20 (wchar_t *__restrict dst, const wchar_t *__restrict src,21 size_t dstsize)) {22 const size_t dstlen = internal::string_length(dst);23 const size_t srclen = internal::string_length(src);24 int limit = static_cast<int>(dstsize - dstlen - 1);25 size_t returnval = (dstsize < dstlen ? dstsize : dstlen) + srclen;26 if (limit < 0)27 return returnval;28 int i = 0;29 for (; i < limit && src[i] != L'\0'; ++i) {30 dst[dstlen + i] = src[i];31 }32 33 // appending null terminator if there is room34 if (dstlen + i < dstlen + dstsize)35 dst[dstlen + i] = L'\0';36 return returnval;37}38 39} // namespace LIBC_NAMESPACE_DECL40