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