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/string/string_utils.h" 12 #include "src/string/strncpy.h" 13 14 #include "src/__support/common.h" 15 16 namespace LIBC_NAMESPACE_DECL { 17 18 LLVM_LIBC_FUNCTION(char *, strncat, 19 (char *__restrict dest, const char *__restrict src, 20 size_t count)) { 21 size_t src_length = internal::string_length(src); 22 size_t copy_amount = src_length > count ? count : src_length; 23 size_t dest_length = internal::string_length(dest); 24 LIBC_NAMESPACE::strncpy(dest + dest_length, src, copy_amount); 25 dest[dest_length + copy_amount] = '\0'; 26 return dest; 27 } 28 29 } // namespace LIBC_NAMESPACE_DECL 30