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/string/string_utils.h"
11 #include "src/string/strncpy.h"
12 
13 #include "src/__support/common.h"
14 
15 namespace __llvm_libc {
16 
17 LLVM_LIBC_FUNCTION(char *, strncat,
18                    (char *__restrict dest, const char *__restrict src,
19                     size_t count)) {
20   size_t srcLength = internal::string_length(src);
21   size_t copyAmount = srcLength > count ? count : srcLength;
22   size_t destLength = internal::string_length(dest);
23   __llvm_libc::strncpy(dest + destLength, src, copyAmount);
24   dest[destLength + copyAmount] = '\0';
25   return dest;
26 }
27 
28 } // namespace __llvm_libc
29