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| 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_TEST_UNITTEST_STRINGUTILS_H |
| 10 | #define LLVM_LIBC_TEST_UNITTEST_STRINGUTILS_H |
| 11 | |
| 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 | |
| 17 | namespace LIBC_NAMESPACE_DECL { |
| 18 | |
| 19 | // Return the first N hex digits of an integer as a string in upper case. |
| 20 | template <typename T> |
| 21 | cpp::enable_if_t<cpp::is_integral_v<T> || is_big_int_v<T>, cpp::string> |
| 22 | int_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_DECL |
| 37 | |
| 38 | #endif // LLVM_LIBC_TEST_UNITTEST_STRINGUTILS_H |
| 39 |
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