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Add an option to avoid wchar APIs on Windows #3636

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Sep 17, 2023
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Add an option to avoid wchar APIs on Windows #3636

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6 changes: 4 additions & 2 deletions include/fmt/format-inl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@
# include <locale>
#endif

#ifdef _WIN32
#if defined(_WIN32) && !defined(FMT_WINDOWS_NO_WCHAR)
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Can this be detected automatically e.g. via some predefined macro or __has_include(<io.h>)?

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@glebm glebm Sep 17, 2023 •
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Done.

It can't always be detected automatically but I've added the 2 cases where it can (missing <io.h> on xbox, or defined WINVER on properly configured Windows projects). Even when it can't be detected automatically, one can always add_definitions(FMT_WINDOWS_NO_WCHAR) in the fmt subproject, so that's not a problem.

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@vitaut vitaut Sep 17, 2023 •
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I was hoping that it will be less messy but thanks for the effort =). It is particularly weird to have this tested in fmt/core.h which explicitly avoids wchar_t. Let's go back to requiring the user to define FMT_WINDOWS_NO_WCHAR, just without the CMake config option.

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Done!

image

# include <io.h> // _isatty
#endif

Expand Down Expand Up @@ -1426,7 +1426,7 @@ FMT_FUNC std::string vformat(string_view fmt, format_args args) {
}

namespace detail {
#ifndef _WIN32
#if !defined(_WIN32) || defined(FMT_WINDOWS_NO_WCHAR)
FMT_FUNC bool write_console(std::FILE*, string_view) { return false; }
#else
using dword = conditional_t<sizeof(long) == 4, unsigned long, unsigned>;
Expand All @@ -1441,7 +1441,9 @@ FMT_FUNC bool write_console(std::FILE* f, string_view text) {
return WriteConsoleW(reinterpret_cast<void*>(_get_osfhandle(fd)), u16.c_str(),
static_cast<uint32_t>(u16.size()), &written, nullptr) != 0;
}
#endif

#ifdef _WIN32
// Print assuming legacy (non-Unicode) encoding.
FMT_FUNC void vprint_mojibake(std::FILE* f, string_view fmt, format_args args) {
auto buffer = memory_buffer();
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2 changes: 1 addition & 1 deletion test/format-impl-test.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -351,7 +351,7 @@ TEST(format_impl_test, write_dragon_even) {
if (!FMT_MSC_VERSION) EXPECT_EQ(s, "33554450");
}

#ifdef _WIN32
#if defined(_WIN32) && !defined(FMT_WINDOWS_NO_WCHAR)
# include <windows.h>

TEST(format_impl_test, write_console_signature) {
Expand Down