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Date: Mon, 12 Jun 2023 22:53:24 +0200
From: Bruno Haible <bruno@...sp.org>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: swprintf %lc directive does not work for some wide characters
Rich Felker wrote:
> Per my reading of the specification, this is not a bug but is the
> expected behavior.
>
> In addition, all forms of fwprintf() shall fail if:
>
> [EILSEQ]
> A wide-character code that does not correspond to a valid
> character has been detected.
From my reading of ISO C, it's a bug. Namely, in ISO C 23 ยง 7.31.2.3
the error conditions are specified as
"The swprintf function returns the number of wide characters written
in the array, not counting the terminating null wide character,
or a negative value if
an encoding error occurred
or if n or more wide characters were requested to be written."
In swprintf, where "the wint_t argument converted to wchar_t" is written
and the output is to a wchar_t[], no "encoding error" should be possible.
That's obvious. The "encoding errors" occur in %c and %s directives,
AFAIU, not in %lc and %ls directives.
Bruno
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