libc/src/string/strlcat.cpp

   1 //===-- Implementation of strlcat -----------------------------------------===//
   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/strlcat.h"
  10 #include "src/string/string_utils.h"
  11
  12 #include "src/__support/common.h"
  13
  14 namespace __llvm_libc {
  15
  16 LLVM_LIBC_FUNCTION(size_t, strlcat,
  17                    (char *__restrict dst, const char *__restrict src,
  18                     size_t size)) {
  19   char *new_dst = reinterpret_cast<char *>(internal::find_first_character(
  20       reinterpret_cast<unsigned char *>(dst), 0, size));
  21   if (!new_dst)
  22     return size + internal::string_length(src);
  23   size_t first_len = new_dst - dst;
  24   return first_len + internal::strlcpy(new_dst, src, size - first_len);
  25 }
  26
  27 } // namespace __llvm_libc