[MinGW-Notify] [mingw] #39687: wcsrtombs with NULL dest pointer doesn't ignore len parameter

Back to archive index
MinGW Notification List mingw****@lists*****
Sun Nov 10 07:01:04 JST 2019

#39687: wcsrtombs with NULL dest pointer doesn't ignore len parameter

  Open Date: 2019-10-19 17:38
Last Update: 2019-11-09 22:01

URL for this Ticket:
RSS feed for this Ticket:


Last Changes/Comment on this Ticket:
2019-11-09 22:01 Updated by: keith


I've attached a tentative patch, which goes at least part of the way towards
resolving this issue. When I run my previous test case under wine-4.18, on my
Manjaro Linux box, I see:

$ mingw32-g++ tc39687.cc
$ LC_CTYPE="en_GB.65001" ./a.exe | cat
Locale: English_United Kingdom.Multibyte string: A wstring-ß水𝄋
Length, including '\0': 20

which is consistent with the behaviour I observe from my original (native) GNU/
Linux test.

(Note that I have to give the LC_CTYPE spec in a mixed Linux/Microsoft format,
because wine's use of libfontconfig raises complaints about a Microsoft-style
language_region part, but not the .codeset part, which I do, currently, need to
give as a Microsoft codepage number; the output from wine is piped through cat
because wine, itself, garbles the display of non-ASCII UTF-8 code points, when
the output is direct to the UTF-8 encoded terminal, whereas cat reads the
correctly formatted UTF-8 output stream, and subsequently displays it

Ticket Status:

      Reporter: gallickgunner
         Owner: keith
          Type: Issues
        Status: Open [Owner assigned]
      Priority: 5 - Medium
     MileStone: (None)
     Component: WSL
      Severity: 5 - Medium
    Resolution: None

Ticket details:

I'm using MinGW-gcc-6.3.0. The wcsrtombs() function as mentioned in the docs on
cppreference should return the number of bytes that would have been written to
src. However it doesn't do so on my end. It seems the implementation doesn't
ignore the length parameter when dest is passed as NULL? A similar issue was
reported and presumably fixed for the Mingw-w64 on the sourceforge site
Currently working around by passing INT_MAX as the length parameter, so it
finishes within the limit and returns the size.

I apologize in advance if this is just an issue from my end or if any other
info is missing. First time submitting a ticket :)

Ticket information of MinGW - Minimalist GNU for Windows project
MinGW - Minimalist GNU for Windows Project is hosted on OSDN

Project URL: https://osdn.net/projects/mingw/
OSDN: https://osdn.net

URL for this Ticket:
RSS feed for this Ticket:

More information about the MinGW-Notify mailing list
Back to archive index