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| 1 | //===-- Reader definition 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_READER_H |
| 10 | #define LLVM_LIBC_SRC_STDIO_SCANF_CORE_READER_H |
| 11 | |
| 12 | #include "src/__support/macros/attributes.h" // For LIBC_INLINE |
| 13 | #include "src/__support/macros/config.h" |
| 14 | |
| 15 | #include <stddef.h> |
| 16 | |
| 17 | namespace LIBC_NAMESPACE_DECL { |
| 18 | namespace scanf_core { |
| 19 | |
| 20 | template <typename Derived> class Reader { |
| 21 | size_t cur_chars_read = 0; |
| 22 | |
| 23 | public: |
| 24 | // This returns the next character from the input and advances it by one |
| 25 | // character. When it hits the end of the string or file it returns '\0' to |
| 26 | // signal to stop parsing. |
| 27 | LIBC_INLINE char getc() { |
| 28 | ++cur_chars_read; |
| 29 | return static_cast<Derived *>(this)->getc(); |
| 30 | } |
| 31 | |
| 32 | // This moves the input back by one character, placing c into the buffer if |
| 33 | // this is a file reader, else c is ignored. |
| 34 | LIBC_INLINE void ungetc(int c) { |
| 35 | --cur_chars_read; |
| 36 | static_cast<Derived *>(this)->ungetc(c); |
| 37 | } |
| 38 | |
| 39 | LIBC_INLINE size_t chars_read() { return cur_chars_read; } |
| 40 | }; |
| 41 | |
| 42 | } // namespace scanf_core |
| 43 | } // namespace LIBC_NAMESPACE_DECL |
| 44 | |
| 45 | #endif // LLVM_LIBC_SRC_STDIO_SCANF_CORE_READER_H |
| 46 |
Warning: This file is not a C or C++ file. It does not have highlighting.