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Date: Tue, 13 Jun 2023 01:09:26 +0200
From: Bruno Haible <bruno@...sp.org>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: 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
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