| 1 | //===-- Implementation of mbtowc -----------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/wchar/mbtowc.h" |
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| 10 | |
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| 11 | #include "hdr/types/size_t.h" |
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| 12 | #include "hdr/types/wchar_t.h" |
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| 13 | #include "src/__support/common.h" |
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| 14 | #include "src/__support/libc_errno.h" |
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| 15 | #include "src/__support/macros/config.h" |
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| 16 | #include "src/__support/wchar/mbrtowc.h" |
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| 17 | #include "src/__support/wchar/mbstate.h" |
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| 18 | |
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| 19 | namespace LIBC_NAMESPACE_DECL { |
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| 20 | |
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| 21 | LLVM_LIBC_FUNCTION(int, mbtowc, |
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| 22 | (wchar_t *__restrict pwc, const char *__restrict s, |
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| 23 | size_t n)) { |
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| 24 | // returns 0 since UTF-8 encoding is not state-dependent |
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| 25 | if (s == nullptr) |
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| 26 | return 0; |
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| 27 | internal::mbstate internal_mbstate; |
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| 28 | // temp ptr to use if pwc is nullptr |
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| 29 | wchar_t buf[1]; |
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| 30 | auto ret = |
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| 31 | internal::mbrtowc(pwc == nullptr ? buf : pwc, s, n, &internal_mbstate); |
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| 32 | if (!ret.has_value() || static_cast<int>(ret.value()) == -2) { |
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| 33 | // Encoding failure |
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| 34 | libc_errno = EILSEQ; |
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| 35 | return -1; |
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| 36 | } |
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| 37 | return static_cast<int>(ret.value()); |
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| 38 | } |
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| 39 | |
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| 40 | } // namespace LIBC_NAMESPACE_DECL |
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| 41 | |
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