| //===-- Implementation of mblen -------------------------------------------===// |
| // |
| // 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/wchar/mblen.h" |
| |
| #include "hdr/types/size_t.h" |
| #include "src/__support/common.h" |
| #include "src/__support/libc_errno.h" |
| #include "src/__support/macros/config.h" |
| #include "src/__support/wchar/mbrtowc.h" |
| #include "src/__support/wchar/mbstate.h" |
| |
| namespace LIBC_NAMESPACE_DECL { |
| |
| LLVM_LIBC_FUNCTION(int, mblen, (const char *s, size_t n)) { |
| // returns 0 since UTF-8 encoding is not state-dependent |
| if (s == nullptr) |
| return 0; |
| internal::mbstate internal_mbstate; |
| auto ret = internal::mbrtowc(nullptr, s, n, &internal_mbstate); |
| if (!ret.has_value() || static_cast<int>(ret.value()) == -2) { |
| // Encoding failure |
| if (!ret.has_value()) |
| libc_errno = EILSEQ; |
| return -1; |
| } |
| return static_cast<int>(ret.value()); |
| } |
| |
| } // namespace LIBC_NAMESPACE_DECL |
