Fork#39687: wcsrtombs with NULL dest pointer doesn't ignore len parameter
Open Date: 2019-10-19 17:38
Last Update: 2020-03-19 22:04
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/39687
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Last Changes/Comment on this Ticket:
2020-03-19 22:04 Updated by: keith
Comment:
I've identified a further issue, this time with the mingwrt-5.3 implementation
of mbsrtowcs(); if the cumulative count of wide characters stored reaches
exactly one less than the nominated buffer length, and conversion of the next
multibyte character results in a surrogate pair, this is stored anyway, causing
a buffer overrun by one wide character. This too, is now corrected in the
repository, for inclusion in mingwrt-5.3.1.
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Ticket Status:
Reporter: gallickgunner
Owner: keith
Type: Issues
Status: Open [Owner assigned]
Priority: 5 - Medium
MileStone: (None)
Component: WSL
Severity: 5 - Medium
Resolution: None
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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 :)
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