Am 02.12.2024 um 18:01 schrieb Roland Mainz via Cygwin:
On Wed, Nov 27, 2024 at 1:49 AM Brian Inglis via Cygwin
<cygwin@cygwin.com> wrote:
On 2024-11-26 17:08, Roland Mainz via Cygwin wrote:
Cygwin 3.5.4/Win10/64bit, the following program prints a '?' where I
would expect a '€' (EURO) symbol:
---- snip ----
printf '#include <stdio.h>\n#include <wchar.h>\n#include
<io.h>\n#include <fcntl.h>\n#include <locale.h>\nint main(int ac, char
*av[]) { setlocale(LC_ALL, ""); printf("%%S\\n", L"hello € world");
return 0; }\n' >x.c && clang -target x86_64-pc-windows-gnu -Wall x.c
-o x.exe && ./x.exe
hello ? world
---- snip ----
My hope was that - because Win32 uses UTF-16 for |wchar_t| - that the
EURO symbol can be displayed on any locale/code page which supports
the EURO symbol, but somehow I always get a '?'.
Does anyone know what I am doing wrong ?
$ grep -aw EURO ~/src/charsets/unicode-symbols.txt
₠ U+20A0 EURO-CURRENCY SIGN
€ U+20AC EURO SIGN
💶 U+1F4B6 BANKNOTE WITH EURO SIGN
What is your terminal locale and charset?
LC_ALL=en_US.UTF-8.
But it turns out my issue is a bit UCRT-specific:
It seems UCRT |printf()| is not able to print wide-char values in all
locales/codepages - instead I have to use |wprintf()| and
|_setmode(_fileno(stdout), _O_WTEXT);|.
Unfortunate side-effect is that putting stdout/stderr in wide-char
mode makes any attempt to do a single-char |printf()| fail with an
assert.
This is not UCRT-specific, same on cygwin. It works if you drop the
-target x86_64-pc-windows-gnu
Cygwin's native stdio doesn't have that limitation.
But now I am a bit cursing because of this little issue from
https://learn.microsoft.com/en-us/cpp/c-runtime-library/format-specification-syntax-printf-and-wprintf-functions?view=msvc-170
---- snip ----
... For historical reasons, the wprintf functions use c and s to refer
to wchar_t characters, and C and S specify narrow characters. ...
---- snip ----
... but it turns out that at least in UCRT you can |#define
_CRT_STDIO_ISO_WIDE_SPECIFIERS 1| to fix this.
Question is in which Windows or Visual Studio version added this feature...
----
Bye,
Roland
--
Problem reports: https://cygwin.com/problems.html
FAQ: https://cygwin.com/faq/
Documentation: https://cygwin.com/docs.html
Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
