27 lines · cpp
1//===-- Implementation of isxdigit-----------------------------------------===//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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/ctype/isxdigit.h"10 11#include "src/__support/CPP/limits.h"12#include "src/__support/common.h"13#include "src/__support/ctype_utils.h"14#include "src/__support/macros/config.h"15 16namespace LIBC_NAMESPACE_DECL {17 18LLVM_LIBC_FUNCTION(int, isxdigit, (int c)) {19 if (c < 0 || c > cpp::numeric_limits<unsigned char>::max())20 return 0;21 const char ch = static_cast<char>(c);22 return static_cast<int>(internal::isalnum(ch) &&23 internal::b36_char_to_int(ch) < 16);24}25 26} // namespace LIBC_NAMESPACE_DECL27