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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/__support/macros/attributes.h" // For LIBC_INLINE
#include "src/__support/macros/config.h"
#include <stddef.h>
namespace LIBC_NAMESPACE_DECL {
namespace scanf_core {
template <typename Derived> class Reader {
size_t cur_chars_read = 0;
public:
// 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.
LIBC_INLINE char getc() {
++cur_chars_read;
return static_cast<Derived *>(this)->getc();
}
// This moves the input back by one character, placing c into the buffer if
// this is a file reader, else c is ignored.
LIBC_INLINE void ungetc(int c) {
--cur_chars_read;
static_cast<Derived *>(this)->ungetc(c);
}
LIBC_INLINE size_t chars_read() { return cur_chars_read; }
};
} // namespace scanf_core
} // namespace LIBC_NAMESPACE_DECL
#endif // LLVM_LIBC_SRC_STDIO_SCANF_CORE_READER_H
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