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//===-- 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
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