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Handle block boundaries in utf8_to_utf16
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cd2b99032f
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@ -158,8 +158,7 @@ FMT_FUNC void report_error(format_func func, int error_code,
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FMT_FUNC void fwrite_fully(const void* ptr, size_t size, size_t count,
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FILE* stream) {
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size_t written = std::fwrite(ptr, size, count, stream);
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if (written < count)
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FMT_THROW(system_error(errno, "cannot write to file"));
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if (written < count) FMT_THROW(system_error(errno, "cannot write to file"));
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}
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} // namespace internal
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@ -1272,7 +1271,7 @@ template <> struct formatter<internal::bigint> {
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};
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FMT_FUNC internal::utf8_to_utf16::utf8_to_utf16(string_view s) {
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for (auto p = s.data(), end = p + s.size(); p != end;) {
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auto transcode = [this](const char* p) {
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auto cp = uint32_t();
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auto error = 0;
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p = utf8_decode(p, &cp, &error);
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@ -1284,6 +1283,17 @@ FMT_FUNC internal::utf8_to_utf16::utf8_to_utf16(string_view s) {
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buffer_.push_back(static_cast<wchar_t>(0xD800 + (cp >> 10)));
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buffer_.push_back(static_cast<wchar_t>(0xDC00 + (cp & 0x3FF)));
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}
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return p;
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};
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auto p = s.data();
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const size_t block_size = 4; // utf8_decode always reads blocks of 4 chars.
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if (s.size() >= block_size) {
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for (auto end = p + s.size() - block_size + 1; p < end;) p = transcode(p);
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}
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if (auto num_chars_left = s.data() + s.size() - p) {
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char buf[4] = {};
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memcpy(buf, p, num_chars_left);
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transcode(buf);
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}
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buffer_.push_back(0);
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}
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@ -408,6 +408,8 @@ TEST(UtilTest, UTF8ToUTF16) {
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EXPECT_EQ(L"\xD801\xDC37", fmt::internal::utf8_to_utf16("𐐷").str());
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EXPECT_THROW_MSG(fmt::internal::utf8_to_utf16("\xc3\x28"), std::runtime_error,
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"invalid utf8");
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EXPECT_THROW_MSG(fmt::internal::utf8_to_utf16(fmt::string_view("л", 1)),
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std::runtime_error, "invalid utf8");
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}
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TEST(UtilTest, UTF8ToUTF16EmptyString) {
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