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From: Bruno Haible <bruno@clisp.org>
To: Rich Felker <dalias@libc.org>
Cc: musl@lists.openwall.com
Date: Tue, 13 Jun 2023 01:09:26 +0200
Message-ID: <2776403.6YUMPnJmAY@nimes>
In-Reply-To: <20230612211336.GD4163@brightrain.aerifal.cx>
References: <16376867.hlxOUv9cDv@nimes> <20230612210159.GC4163@brightrain.aerifal.cx> <20230612211336.GD4163@brightrain.aerifal.cx>
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Subject: Re: [musl] swprintf cannot handle the character 0xff

Rich Felker wrote:
> However, for wide printf:
> 
>     c
>     If no l (ell) qualifier is present, the int argument shall be
>     converted to a wide character as if by calling the btowc()
>     function and the resulting wide character shall be written.
> 
> There's no specification of what happens if btowc fails here, but
> passing EOF to btowc is required to fail and return WEOF.

Possibly. But in the test program that I provided, I pass 255, not
-1 (= EOF).

It's well-known that the preferred way to convert a 'char' to 'int'
is not by direct assigment/cast, but by casting to 'unsigned char'.
That's well-known from [f]getc(), the <ctype.h> functions, etc.
You don't need to particularly care about programmers who pass
'\xff' to a function that expects an 'int'.

Bruno