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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
//
//===----------------------------------------------------------------------===//
#include "src/stdio/scanf_core/reader.h"
#include <stddef.h>
namespace LIBC_NAMESPACE {
namespace scanf_core {
void Reader::ungetc(char c) {
--cur_chars_read;
if (rb != nullptr && rb->buff_cur > 0) {
// While technically c should be written back to the buffer, in scanf we
// always write the character that was already there. Additionally, the
// buffer is most likely to contain a string that isn't part of a file,
// which may not be writable.
--(rb->buff_cur);
return;
}
stream_ungetc(static_cast<int>(c), input_stream);
}
} // namespace scanf_core
} // namespace LIBC_NAMESPACE
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