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Date: Sat, 15 Nov 2014 12:29:14 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] implement a private state for the uchar.h
functions
On Sun, Nov 09, 2014 at 11:18:08AM +0100, Jens Gustedt wrote:
> The C standard is imperative on that:
>
> 7.28.1 ... If ps is a null pointer, each function uses its own internal
> mbstate_t object instead, which is initialized at program startup to
> the initial conversion state;
>
> and these functions are also not supposed to implicitly use the state of
> the wchar.h functions:
>
> 7.29.6.3 ... The implementation behaves as if no library function calls
> these functions with a null pointer for ps.
>
> Previously this resulted in two bugs.
>
> - The functions c16rtomb and mbrtoc16 would crash when called with ps
> set to null.
>
> - The functions c32rtomb and mbrtoc32 used the private states of wcrtomb
> and mbrtowc, respectively, which they are not allowed to do.
One small correction: wcrtomb has no state, and c32rtomb does not need
any either.
Rich
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