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//===-- Core Structures for scanf ------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC_STDIO_SCANF_CORE_CORE_STRUCTS_H
#define LLVM_LIBC_SRC_STDIO_SCANF_CORE_CORE_STRUCTS_H
#include "src/__support/CPP/bitset.h"
#include "src/__support/CPP/string_view.h"
#include "src/__support/macros/config.h"
#include <inttypes.h>
#include <stddef.h>
namespace LIBC_NAMESPACE_DECL {
namespace scanf_core {
// These length modifiers match the length modifiers in the format string, which
// is why they are formatted differently from the rest of the file.
enum class LengthModifier { hh, h, l, ll, j, z, t, L, NONE };
enum FormatFlags : uint8_t {
NONE = 0x00,
NO_WRITE = 0x01, // *
ALLOCATE = 0x02, // m
};
struct FormatSection {
bool has_conv;
cpp::string_view raw_string;
// Format Specifier Values
FormatFlags flags = FormatFlags::NONE;
LengthModifier length_modifier = LengthModifier::NONE;
int max_width = -1;
// output_ptr is nullptr if and only if the NO_WRITE flag is set.
void *output_ptr = nullptr;
char conv_name;
cpp::bitset<256> scan_set;
LIBC_INLINE bool operator==(const FormatSection &other) {
if (has_conv != other.has_conv)
return false;
if (raw_string != other.raw_string)
return false;
if (has_conv) {
if (!((static_cast<uint8_t>(flags) ==
static_cast<uint8_t>(other.flags)) &&
(max_width == other.max_width) &&
(length_modifier == other.length_modifier) &&
(conv_name == other.conv_name)))
return false;
// If the pointers are used, then they should be equal. If the NO_WRITE
// flag is set or the conversion is %, then the pointers are not used.
// If the pointers are used and they are not equal, return false.
if (!(((flags & FormatFlags::NO_WRITE) != 0) || (conv_name == '%') ||
(output_ptr == other.output_ptr)))
return false;
if (conv_name == '[')
return scan_set == other.scan_set;
}
return true;
}
};
enum ErrorCodes : int {
// This is the value to be returned by conversions when no error has occurred.
READ_OK = 0,
// These are the scanf return values for when an error has occurred. They are
// all negative, and should be distinct.
FILE_READ_ERROR = -1,
FILE_STATUS_ERROR = -2,
MATCHING_FAILURE = -3,
ALLOCATION_FAILURE = -4,
};
} // namespace scanf_core
} // namespace LIBC_NAMESPACE_DECL
#endif // LLVM_LIBC_SRC_STDIO_SCANF_CORE_CORE_STRUCTS_H
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