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//===-- Reader definition 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_READER_H
#define LLVM_LIBC_SRC_STDIO_SCANF_CORE_READER_H
#include "src/stdio/scanf_core/file_reader.h"
#include "src/stdio/scanf_core/string_reader.h"
#include <stddef.h>
namespace __llvm_libc {
namespace scanf_core {
enum class ReaderType { String, File };
class Reader final {
union {
StringReader *string_reader;
FileReader *file_reader;
};
const ReaderType reader_type;
size_t cur_chars_read = 0;
public:
Reader(StringReader *init_string_reader)
: string_reader(init_string_reader), reader_type(ReaderType::String) {}
Reader(FileReader *init_file_reader)
: file_reader(init_file_reader), reader_type(ReaderType::File) {}
// This returns the next character from the input and advances it by one
// character. When it hits the end of the string or file it returns '\0' to
// signal to stop parsing.
char getc();
// This moves the input back by one character, placing c into the buffer if
// this is a file reader, else c is ignored.
void ungetc(char c);
size_t chars_read() { return cur_chars_read; }
bool has_error();
};
} // namespace scanf_core
} // namespace __llvm_libc
#endif // LLVM_LIBC_SRC_STDIO_SCANF_CORE_READER_H
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