[Bug libc/29913] iconv(3) is not POSIX compliant, and does not conform to linux man-pages manual

["rrt at sc3d dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29913

--- Comment #8 from Reuben Thomas <rrt at sc3d dot org> ---
(In reply to Bruno Haible from comment #4)
> 
> According to my interpretation of the man page (and I wrote that man page
> originally), "An invalid multibyte sequence is encountered in the input" may
> also - depending on the implementation - include the case of input that
> cannot be meaningfully converted, neither in a reversible nor in a
> nonreversible way.

Sorry, but this is an unwarranted interpretation. It's unreasonable without
extra explanation to expect the reader to recognize that "invalid" refers to
the wider context of the conversion. The fact that it says "invalid multibyte
sequence" reinforces this impression: if your interpretation were correct, then
iconv would not be expected to return EILSEQ when a single-byte sequence was
not translatable, only when a multibyte sequence is untranslatable.

I'll file a separate bug about the documentation. The glibc manual also, as far
as I can see, does not document the actual (useful!) behaviour.

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