| //===-- Collection of utils for implementing wide char functions --*-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_SUPPORT_WCTYPE_UTILS_H |
| #define LLVM_LIBC_SRC_SUPPORT_WCTYPE_UTILS_H |
| |
| #include "src/__support/CPP/optional.h" |
| #include "src/__support/macros/attributes.h" // LIBC_INLINE |
| |
| #define __need_wint_t |
| #define __need_wchar_t |
| #include <stddef.h> // needed for wint_t and wchar_t |
| |
| namespace __llvm_libc { |
| namespace internal { |
| |
| // ------------------------------------------------------ |
| // Rationale: Since these classification functions are |
| // called in other functions, we will avoid the overhead |
| // of a function call by inlining them. |
| // ------------------------------------------------------ |
| |
| LIBC_INLINE cpp::optional<int> wctob(wint_t c) { |
| // This needs to be translated to EOF at the callsite. This is to avoid |
| // including stdio.h in this file. |
| if (c > 127 || c < 0) |
| return cpp::nullopt; |
| return static_cast<int>(c); |
| } |
| |
| LIBC_INLINE cpp::optional<wint_t> btowc(int c) { |
| if (c > 127 || c < 0) |
| return cpp::nullopt; |
| return static_cast<wint_t>(c); |
| } |
| |
| } // namespace internal |
| } // namespace __llvm_libc |
| |
| #endif // LLVM_LIBC_SRC_SUPPORT_WCTYPE_UTILS_H |