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 LIBC_NAMESPACE { 16 17 LLVM_LIBC_FUNCTION(char *, strncat, 18 (char *__restrict dest, const char *__restrict src, 19 size_t count)) { 20 size_t src_length = internal::string_length(src); 21 size_t copy_amount = src_length > count ? count : src_length; 22 size_t dest_length = internal::string_length(dest); 23 LIBC_NAMESPACE::strncpy(dest + dest_length, src, copy_amount); 24 dest[dest_length + copy_amount] = '\0'; 25 return dest; 26 } 27 28 } // namespace LIBC_NAMESPACE 29