On Monday 17 November 2025 22:06:40 Martin Storsjö wrote: > On Mon, 17 Nov 2025, Pali Rohár wrote: > > > On Monday 17 November 2025 17:13:56 Martin Storsjö wrote: > > > On Sat, 25 Oct 2025, Pali Rohár wrote: > > > > > > > Format %Z takes pointer to ANSI_STRING or UNICODE_STRING based on the > > > > wideness of format. > > > > > > > > In this mingw-w64 implementation (same as in UCRT) the uppercase format > > > > %Z > > > > has the same default wideness as uppercase format %S when no h, l or w > > > > modifier is specified. > > > > > > > > Format %Z is supported by crtdll, msvcrt and UCRT libraries. There are > > > > some > > > > differences between individual CRT versions regarding the wide > > > > wprintf(%lZ), > > > > narrow printf(%Z/%lZ) and whether nul chars in ANSI_STRING are accepted > > > > by > > > > wprintf or not. In mingw-w64 for compatibility reasons are accepted. > > > > > > The last sentence, "In mingw-w64 for compatibility reasons are accepted." > > > seems like it is missing something, in order to make sense. > > > > Ah, right, there is missing "they" (nul chars). Should be "they are > > accepted". > > > > > > diff --git a/mingw-w64-crt/stdio/mingw_pformat.c > > > > b/mingw-w64-crt/stdio/mingw_pformat.c > > > > index bdc7eba2a573..ded916c9a2bc 100644 > > > > --- a/mingw-w64-crt/stdio/mingw_pformat.c > > > > +++ b/mingw-w64-crt/stdio/mingw_pformat.c > > > > @@ -66,6 +66,7 @@ > > > > #include <limits.h> > > > > #include <locale.h> > > > > #include <wchar.h> > > > > +#include <ntdef.h> > > > > > > > > #ifdef __ENABLE_DFP > > > > #ifndef __STDC_WANT_DEC_FP__ > > > > @@ -2558,6 +2559,64 @@ __pformat (int flags, void *dest, int max, const > > > > APICHAR *fmt, va_list argv) > > > > */ > > > > __pformat_puts( va_arg( argv, char * ), &stream ); > > > > goto format_scan; > > > > + > > > > + case 'Z': > > > > + /* > > > > + * The logic for `%Z` length modifier is quite complicated. > > > > + * > > > > + * for printf: > > > > + * `%Z` - UNICODE_STRING for UCRT; ANSI_STRING for > > > > crtdll,msvcrt10,msvcrt,msvcr80-msvcr120 > > > > + * `%hZ` - ANSI_STRING > > > > + * `%lZ` - UNICODE_STRING for UCRT; ANSI_STRING for > > > > crtdll,msvcrt10,msvcrt,msvcr80-msvcr120 > > > > + * `%wZ` - UNICODE_STRING > > > > + * > > > > + * for wprintf: > > > > + * `%Z` - ANSI_STRING > > > > + * `%hZ` - ANSI_STRING > > > > + * `%lZ` - UNICODE_STRING for UCRT; ANSI_STRING for > > > > crtdll,msvcrt10,msvcrt,msvcr80-msvcr120 > > > > + * `%wZ` - UNICODE_STRING > > > > + * > > > > + * There are some other changes between versions regarding > > > > nul chars. > > > > + * - msvcrt since Vista, msvcr80+ and UCRT do not accept > > > > nul chars in ANSI_STRING for wprintf. They stop at nul char and returns > > > > -1. > > > > + * - crtdll, msvcrt10 and msvcrt before Vista accept nul > > > > char in ANSI_STRING for wprintf, but ANSI_STRING content after nul char > > > > is discarded. > > > > > > This explanation doesn't feel like it makes sense to me. If it accepts the > > > nul char, the wouldn't it also proceed after that? So do you say that it > > > includes the single nul char in the output, but nothing after it? While > > > the > > > logical thing would be to either stop at the nul (not outputting it) or > > > include everything? > > > > I used term "accept" whether wprintf will continue or immediately > > returns -1. I think that this was the main confusing here. > > No, the main confusion here is that some of the sentences here are > contradicting themselves. The core of the confusion is above: > > "crtdll, msvcrt10 and msvcrt before Vista accept nul char in ANSI_STRING for > wprintf, but ANSI_STRING content after nul char is discarded." > > Here you describe two different behaviours for ANSI_STRING. Do you mean one > behaviour for ANSI_STRING and one for UNICODE_STRING? > > // Martin
Ok, I will to rephrase that sentence: crtdll, msvcrt10 and msvcrt before Vista accept ANSI_STRING with nul chars in wprintf call, but the first nul char and everything after it in the ANSI_STRING content is ignored and not printed by wprintf at all. _______________________________________________ Mingw-w64-public mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
