1//===-- Implementation of strncat -----------------------------------------===//
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/string/strncat.h"
10#include "src/__support/macros/config.h"
11#include "src/__support/macros/null_check.h"
12#include "src/string/string_utils.h"
13
14#include "src/__support/common.h"
15
16namespace LIBC_NAMESPACE_DECL {
17
18LLVM_LIBC_FUNCTION(char *, strncat,
19 (char *__restrict dest, const char *__restrict src,
20 size_t count)) {
21 if (count) {
22 LIBC_CRASH_ON_NULLPTR(dest);
23 LIBC_CRASH_ON_NULLPTR(src);
24 }
25 size_t dest_length = internal::string_length(dest);
26 size_t i;
27 for (i = 0; i < count && src[i] != '\0'; ++i)
28 dest[dest_length + i] = src[i];
29
30 dest[dest_length + i] = '\0';
31 return dest;
32}
33
34} // namespace LIBC_NAMESPACE_DECL
35

source code of libc/src/string/strncat.cpp