libc/src/string/allocating_string_utils.h

   1 //===-- Allocating string utils ---------------------------------*- C++ -*-===//
   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 #ifndef LIBC_SRC_STRING_ALLOCATING_STRING_UTILS_H
  10 #define LIBC_SRC_STRING_ALLOCATING_STRING_UTILS_H
  11
  12 #include "src/__support/CPP/new.h"
  13 #include "src/__support/CPP/optional.h"
  14 #include "src/__support/macros/config.h"
  15 #include "src/string/memory_utils/memcpy_implementations.h" // For string_length
  16 #include "src/string/string_utils.h"
  17
  18 #include <stddef.h> // For size_t
  19
  20 namespace __llvm_libc {
  21 namespace internal {
  22
  23 LIBC_INLINE cpp::optional<char *> strdup(const char *src) {
  24   if (src == nullptr)
  25     return cpp::nullopt;
  26   size_t len = string_length(src) + 1;
  27   AllocChecker ac;
  28   char *newstr = new (ac) char[len];
  29   if (!ac)
  30     return cpp::nullopt;
  31   inline_memcpy(newstr, src, len);
  32   return newstr;
  33 }
  34
  35 } // namespace internal
  36 } // namespace __llvm_libc
  37
  38 #endif