libc/src/stdlib/strtoul.cpp

   1 //===-- Implementation of strtoul -----------------------------------------===//
   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/stdlib/strtoul.h"
  10 #include "src/__support/common.h"
  11 #include "src/__support/str_to_integer.h"
  12 #include "src/errno/libc_errno.h"
  13
  14 namespace LIBC_NAMESPACE {
  15
  16 LLVM_LIBC_FUNCTION(unsigned long, strtoul,
  17                    (const char *__restrict str, char **__restrict str_end,
  18                     int base)) {
  19   auto result = internal::strtointeger<unsigned long>(str, base);
  20   if (result.has_error())
  21     libc_errno = result.error;
  22
  23   if (str_end != nullptr)
  24     *str_end = const_cast<char *>(str + result.parsed_len);
  25
  26   return result;
  27 }
  28
  29 } // namespace LIBC_NAMESPACE