Date: Sun, 10 May 2015 09:42:30 -0400 From: Rich Felker <dalias@...c.org> To: 罗勇刚(Yonggang Luo) <luoyonggang@...il.com> Cc: John Sully <john@...uare.ca>, Karsten Blees <blees@...n.de>, musl@...ts.openwall.com, dplakosh@...t.org, austin-group-l@...ngroup.org, hsutter@...rosoft.com, Clang Dev <cfe-dev@...uiuc.edu>, James McNellis <james@...esmcnellis.com> Subject: Re: Re: [cfe-dev] Is that getting wchar_t to be 32bit on win32 a good idea for compatible with Unix world by implement posix layer on win32 API? On Sun, May 10, 2015 at 08:31:54PM +0800, 罗勇刚(Yonggang Luo) wrote: > For example, the open function exist both in msvcrt and posix, > int open(const char *path, int oflag, ...); > > But in msvcrt, the path is ANSI encoding, and in posix, path is utf8 encoding, > > So if we need to developing a cross-platform application, On Win32, > the open function should not be used. > But in fact, there is no openw(const wchar*path) API in posix or Win32, > So we need to re-implement open function on win32 with the same API, > and convert to > the wchar_t version of Window 32 API, _wopen, > That's would be a chaos for those developers want to use open function > in both posix and win32. I assumed you were already planning for your POSIX layer an open function which takes a UTF-8 string and converts it transparently to whatever encoding (i.e. UTF-16) the underlying Windows operations need. If you don't have that, then you're a step behind even Cygwin and significantly behind midipix in terms of the ability to provide a POSIX+Unicode environment that can run existing POSIX-targeted applications unmodified. Anyone wanting Unicode filename support would have to fill their codebase with Windows-specific openw() calls, which is basically the same situation you have now on Windows. > And if we turn the wchar_t to be 32 bit on win32, > first, posix still have no wide version of open function > second, to implement open function on win32, we need to consider the > fact wchar_t is 32bit now, and should re-use the exist _wopen in > a different way and all other exist wide version of Win32 API. I don't follow what you're saying here. Rich
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