[Bug 296764] iconv_open() accepts but does not implement //NON_IDENTICAL_DISCARD

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296764

            Bug ID: 296764
           Summary: iconv_open() accepts but does not implement
                    //NON_IDENTICAL_DISCARD
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: michael@orlitzky.com

FreeBSD's iconv_open() will accept any of the magic //SUFFIX indicators
appended to the destination codeset and discards all but //IGNORE:

https://cgit.freebsd.org/src/tree/lib/libc/iconv/bsd_iconv.c#n60

As the codeset names themselves are implementation-defined, this is usually not
a problem, because your implementation defines them to do nothing :)

POSIX 2024 however specifies a new suffix, //NON_IDENTICAL_DISCARD:

https://pubs.opengroup.org/onlinepubs/9799919799/functions/iconv_open.html

As a result, accepting but not implementing that particular suffix may lead to
confusion. It is probably better to return EINVAL from iconv_open() in that
case, to indicate that the suffix is "unrecognized or not supported."

The iconv(3) man page refers to an older version of POSIX, so the documentation
and implementation are not in error, but sooner or later people are going to
start using this suffix and be surprised. A strcmp and return EINVAL would make
it not your problem.

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