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-exception
6//
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 room
34 if (dstlen + i < dstlen + dstsize)
35 dst[dstlen + i] = L'\0';
36 return returnval;
37}
38
39} // namespace LIBC_NAMESPACE_DECL
40

source code of libc/src/wchar/wcslcat.cpp