39 lines · c
1//===-- String utils for matchers -------------------------------*- 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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_LIBC_TEST_UNITTEST_STRINGUTILS_H10#define LLVM_LIBC_TEST_UNITTEST_STRINGUTILS_H11 12#include "src/__support/CPP/string.h"13#include "src/__support/CPP/type_traits.h"14#include "src/__support/big_int.h"15#include "src/__support/macros/config.h"16 17namespace LIBC_NAMESPACE_DECL {18 19// Return the first N hex digits of an integer as a string in upper case.20template <typename T>21cpp::enable_if_t<cpp::is_integral_v<T> || is_big_int_v<T>, cpp::string>22int_to_hex(T value, size_t length = sizeof(T) * 2) {23 cpp::string s(length, '0');24 25 constexpr char HEXADECIMALS[16] = {'0', '1', '2', '3', '4', '5', '6', '7',26 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};27 for (size_t i = 0; i < length; i += 2, value >>= 8) {28 unsigned char mod = static_cast<unsigned char>(value) & 0xFF;29 s[length - i] = HEXADECIMALS[mod & 0x0F];30 s[length - (i + 1)] = HEXADECIMALS[mod & 0x0F];31 }32 33 return "0x" + s;34}35 36} // namespace LIBC_NAMESPACE_DECL37 38#endif // LLVM_LIBC_TEST_UNITTEST_STRINGUTILS_H39