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1//===-- Shared Converter Utilities for printf -------------------*- 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_SRC_STDIO_PRINTF_CORE_CONVERTER_UTILS_H10#define LLVM_LIBC_SRC_STDIO_PRINTF_CORE_CONVERTER_UTILS_H11 12#include "src/__support/CPP/limits.h"13#include "src/__support/macros/config.h"14#include "src/stdio/printf_core/core_structs.h"15 16#include <inttypes.h>17#include <stddef.h>18 19namespace LIBC_NAMESPACE_DECL {20namespace printf_core {21 22LIBC_INLINE uintmax_t apply_length_modifier(uintmax_t num,23 LengthSpec length_spec) {24 auto [lm, bw] = length_spec;25 switch (lm) {26 case LengthModifier::none:27 return num & cpp::numeric_limits<unsigned int>::max();28 case LengthModifier::l:29 return num & cpp::numeric_limits<unsigned long>::max();30 case LengthModifier::ll:31 case LengthModifier::L:32 return num & cpp::numeric_limits<unsigned long long>::max();33 case LengthModifier::h:34 return num & cpp::numeric_limits<unsigned short>::max();35 case LengthModifier::hh:36 return num & cpp::numeric_limits<unsigned char>::max();37 case LengthModifier::z:38 return num & cpp::numeric_limits<size_t>::max();39 case LengthModifier::t:40 // We don't have unsigned ptrdiff so uintptr_t is used, since we need an41 // unsigned type and ptrdiff is usually the same size as a pointer.42 static_assert(sizeof(ptrdiff_t) == sizeof(uintptr_t));43 return num & cpp::numeric_limits<uintptr_t>::max();44 case LengthModifier::j:45 return num; // j is intmax, so no mask is necessary.46 case LengthModifier::w:47 case LengthModifier::wf: {48 uintmax_t mask;49 if (bw == 0) {50 mask = 0;51 } else if (bw < sizeof(uintmax_t) * CHAR_BIT) {52 mask = (static_cast<uintmax_t>(1) << bw) - 1;53 } else {54 mask = UINTMAX_MAX;55 }56 return num & mask;57 }58 }59 __builtin_unreachable();60}61 62#define RET_IF_RESULT_NEGATIVE(func) \63 { \64 int result = (func); \65 if (result < 0) \66 return result; \67 }68 69// This is used to represent which direction the number should be rounded.70enum class RoundDirection { Up, Down, Even };71 72} // namespace printf_core73} // namespace LIBC_NAMESPACE_DECL74 75#endif // LLVM_LIBC_SRC_STDIO_PRINTF_CORE_CONVERTER_UTILS_H76