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LibC: Implement {f,}getwc()
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3b281baf75
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5 changed files with 207 additions and 130 deletions
59
Userland/Libraries/LibC/wstdio.cpp
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59
Userland/Libraries/LibC/wstdio.cpp
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/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Assertions.h>
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#include <AK/StringBuilder.h>
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#include <AK/Types.h>
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#include <bits/stdio_file_implementation.h>
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#include <errno.h>
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#include <stdio.h>
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#include <wchar.h>
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static_assert(AssertSize<wchar_t, sizeof(u32)>());
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extern "C" {
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wint_t fgetwc(FILE* stream)
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{
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VERIFY(stream);
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Array<u8, 4> underlying;
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auto underlying_bytes = underlying.span();
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size_t encoded_length = 0;
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size_t bytes_read = 0;
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do {
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size_t nread = fread(underlying_bytes.offset_pointer(bytes_read), 1, 1, stream);
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if (nread != 1) {
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errno = EILSEQ;
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return WEOF;
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}
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++bytes_read;
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if (bytes_read == 1) {
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if (underlying[0] >> 7 == 0) {
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encoded_length = 1;
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} else if (underlying[0] >> 5 == 6) {
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encoded_length = 2;
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} else if (underlying[0] >> 4 == 0xe) {
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encoded_length = 3;
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} else if (underlying[0] >> 3 == 0x1e) {
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encoded_length = 4;
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} else {
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errno = EILSEQ;
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return WEOF;
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}
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}
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} while (bytes_read < encoded_length);
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wchar_t code_point;
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auto read_bytes = mbrtowc(&code_point, bit_cast<char const*>(underlying.data()), encoded_length, nullptr);
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VERIFY(read_bytes == encoded_length);
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return code_point;
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}
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wint_t getwc(FILE* stream)
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{
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return fgetwc(stream);
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}
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}
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