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-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef LLVM_LIBC_UTILS_UNITTEST_SIMPLE_STRING_CONV_H
10 #define LLVM_LIBC_UTILS_UNITTEST_SIMPLE_STRING_CONV_H
11 
12 #include "src/__support/CPP/TypeTraits.h"
13 
14 #include <string>
15 
16 namespace __llvm_libc {
17 
18 // Return the first N hex digits of an integer as a string in upper case.
19 template <typename T>
20 cpp::EnableIfType<cpp::IsIntegral<T>::Value, std::string>
21 int_to_hex(T X, size_t Length = sizeof(T) * 2) {
22   std::string s(Length, '0');
23 
24   for (auto it = s.rbegin(), end = s.rend(); it != end; ++it, X >>= 4) {
25     unsigned char Mod = static_cast<unsigned char>(X) & 15;
26     *it = (Mod < 10 ? '0' + Mod : 'a' + Mod - 10);
27   }
28 
29   return s;
30 }
31 
32 } // namespace __llvm_libc
33 
34 #endif // LLVM_LIBC_UTILS_UNITTEST_SIMPLE_STRING_CONV_H
35