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| 1 | //===-- Core Structures for scanf ------------------------------*- 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_SRC_STDIO_SCANF_CORE_CORE_STRUCTS_H |
| 10 | #define LLVM_LIBC_SRC_STDIO_SCANF_CORE_CORE_STRUCTS_H |
| 11 | |
| 12 | #include "src/__support/CPP/bitset.h" |
| 13 | #include "src/__support/CPP/string_view.h" |
| 14 | #include "src/__support/macros/config.h" |
| 15 | |
| 16 | #include <inttypes.h> |
| 17 | #include <stddef.h> |
| 18 | |
| 19 | namespace LIBC_NAMESPACE_DECL { |
| 20 | namespace scanf_core { |
| 21 | |
| 22 | // These length modifiers match the length modifiers in the format string, which |
| 23 | // is why they are formatted differently from the rest of the file. |
| 24 | enum class LengthModifier { hh, h, l, ll, j, z, t, L, NONE }; |
| 25 | |
| 26 | enum FormatFlags : uint8_t { |
| 27 | NONE = 0x00, |
| 28 | NO_WRITE = 0x01, // * |
| 29 | ALLOCATE = 0x02, // m |
| 30 | }; |
| 31 | |
| 32 | struct FormatSection { |
| 33 | bool has_conv; |
| 34 | |
| 35 | cpp::string_view raw_string; |
| 36 | |
| 37 | // Format Specifier Values |
| 38 | FormatFlags flags = FormatFlags::NONE; |
| 39 | LengthModifier length_modifier = LengthModifier::NONE; |
| 40 | int max_width = -1; |
| 41 | |
| 42 | // output_ptr is nullptr if and only if the NO_WRITE flag is set. |
| 43 | void *output_ptr = nullptr; |
| 44 | |
| 45 | char conv_name; |
| 46 | |
| 47 | cpp::bitset<256> scan_set; |
| 48 | |
| 49 | LIBC_INLINE bool operator==(const FormatSection &other) { |
| 50 | if (has_conv != other.has_conv) |
| 51 | return false; |
| 52 | |
| 53 | if (raw_string != other.raw_string) |
| 54 | return false; |
| 55 | |
| 56 | if (has_conv) { |
| 57 | if (!((static_cast<uint8_t>(flags) == |
| 58 | static_cast<uint8_t>(other.flags)) && |
| 59 | (max_width == other.max_width) && |
| 60 | (length_modifier == other.length_modifier) && |
| 61 | (conv_name == other.conv_name))) |
| 62 | return false; |
| 63 | |
| 64 | // If the pointers are used, then they should be equal. If the NO_WRITE |
| 65 | // flag is set or the conversion is %, then the pointers are not used. |
| 66 | // If the pointers are used and they are not equal, return false. |
| 67 | |
| 68 | if (!(((flags & FormatFlags::NO_WRITE) != 0) || (conv_name == '%') || |
| 69 | (output_ptr == other.output_ptr))) |
| 70 | return false; |
| 71 | |
| 72 | if (conv_name == '[') |
| 73 | return scan_set == other.scan_set; |
| 74 | } |
| 75 | return true; |
| 76 | } |
| 77 | }; |
| 78 | |
| 79 | enum ErrorCodes : int { |
| 80 | // This is the value to be returned by conversions when no error has occurred. |
| 81 | READ_OK = 0, |
| 82 | // These are the scanf return values for when an error has occurred. They are |
| 83 | // all negative, and should be distinct. |
| 84 | FILE_READ_ERROR = -1, |
| 85 | FILE_STATUS_ERROR = -2, |
| 86 | MATCHING_FAILURE = -3, |
| 87 | ALLOCATION_FAILURE = -4, |
| 88 | }; |
| 89 | } // namespace scanf_core |
| 90 | } // namespace LIBC_NAMESPACE_DECL |
| 91 | |
| 92 | #endif // LLVM_LIBC_SRC_STDIO_SCANF_CORE_CORE_STRUCTS_H |
| 93 |
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