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Added synchronization with the main storage device before direct recording #3668

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Added synchronization with the main storage device before direct recording #3668

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8dbae41
refactoring
Roman-Koshelev Oct 2, 2023
4fe961f
add buffer flush before direct write
Roman-Koshelev Oct 3, 2023
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16 changes: 7 additions & 9 deletions include/fmt/format-inl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -73,9 +73,8 @@ FMT_FUNC void report_error(format_func func, int error_code,
}

// A wrapper around fwrite that throws on error.
inline void fwrite_fully(const void* ptr, size_t size, size_t count,
FILE* stream) {
size_t written = std::fwrite(ptr, size, count, stream);
inline void fwrite_fully(const void* ptr, size_t count, FILE* stream) {
size_t written = std::fwrite(ptr, 1, count, stream);
if (written < count)
FMT_THROW(system_error(errno, FMT_STRING("cannot write to file")));
}
Expand Down Expand Up @@ -1433,13 +1432,12 @@ extern "C" __declspec(dllimport) int __stdcall WriteConsoleW( //
void*, const void*, dword, dword*, void*);

FMT_FUNC bool write_console(std::FILE* f, string_view text) {
auto fd = _fileno(f);
int fd = _fileno(f);
if (!_isatty(fd)) return false;
std::fflush(f);
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@dimztimz dimztimz Oct 25, 2023 •
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Adding fflush here is not correct. This function write_console() is called either from the C stream print() or the C++ iostream print(). In the latter case, fflush should not be called at all, instead the ostream flush should be invoked.

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This flush is indeed redundant for iostream but in the future please report issues like these once to avoid too much notification noise.

auto u16 = utf8_to_utf16(text);
auto written = dword();
return WriteConsoleW(reinterpret_cast<void*>(_get_osfhandle(fd)), u16.c_str(),
static_cast<uint32_t>(u16.size()), &written,
nullptr) != 0;
static_cast<dword>(u16.size()), nullptr, nullptr) != 0;
}
#endif

Expand All @@ -1448,12 +1446,12 @@ FMT_FUNC bool write_console(std::FILE* f, string_view text) {
FMT_FUNC void vprint_mojibake(std::FILE* f, string_view fmt, format_args args) {
auto buffer = memory_buffer();
detail::vformat_to(buffer, fmt, args);
fwrite_fully(buffer.data(), 1, buffer.size(), f);
fwrite_fully(buffer.data(), buffer.size(), f);
}
#endif

FMT_FUNC void print(std::FILE* f, string_view text) {
if (!write_console(f, text)) fwrite_fully(text.data(), 1, text.size(), f);
if (!write_console(f, text)) fwrite_fully(text.data(), text.size(), f);
}
} // namespace detail

Expand Down
11 changes: 6 additions & 5 deletions include/fmt/ostream.h
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Expand Up @@ -38,24 +38,25 @@ auto get_file(std::filebuf&) -> FILE*;
#endif

inline bool write_ostream_unicode(std::ostream& os, fmt::string_view data) {
FILE* c_file = nullptr;
#if FMT_MSC_VERSION
if (auto* buf = dynamic_cast<std::filebuf*>(os.rdbuf()))
if (FILE* f = get_file(*buf)) return write_console(f, data);
c_file = get_file(*buf);
#elif defined(_WIN32) && defined(__GLIBCXX__)
auto* rdbuf = os.rdbuf();
FILE* c_file;
if (auto* sfbuf = dynamic_cast<__gnu_cxx::stdio_sync_filebuf<char>*>(rdbuf))
c_file = sfbuf->file();
else if (auto* fbuf = dynamic_cast<__gnu_cxx::stdio_filebuf<char>*>(rdbuf))
c_file = fbuf->file();
else
return false;
if (c_file) return write_console(c_file, data);
#else
ignore_unused(os, data);
ignore_unused(os);
#endif
return false;
if (!c_file) return false;
return write_console(c_file, data);
}

inline bool write_ostream_unicode(std::wostream&,
fmt::basic_string_view<wchar_t>) {
return false;
Expand Down