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

["steffen at sdaoden dot eu" <sourceware-bugzilla@sourceware.org>]

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

            Bug ID: 29913
           Summary: iconv(3) is not POSIX compliant, and does not conform
                    to linux man-pages manual
           Product: glibc
           Version: 2.36
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: steffen at sdaoden dot eu
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Disclaimer: i have reported this in the past but the issue was closed.

The problem is that without //TRANSLIT GNU iconv(3) fails to perform the

  If iconv( ) encounters a character in the input buffer that is valid, but for
which an identical character does not exist in the target codeset, iconv( )
shall perform an implementation-defined conversion on this character.

POSIX iconv(3) (Vol. 2: System Interfaces, Issue 7) requirement.
Instead GNU libc returns EILSEQ which is wrong as POSIX defined EILSEQ only for

  [EILSEQ] Input conversion stopped due to an input byte that does not belong
to the input codeset.

The Linux man-pages 6.01 manual (2022‐10‐09) says the same.  But GNU libc
_does_ fail for EILSEQ without //TRANSLIT even if the input is valid UTF-8.
As can be seen by running this (shortened variant of a config test program).
I say "Bye!" already here, and hope it gets fixed!

#include <string.h>
#include <errno.h>
#include <stdio.h>
#include <iconv.h>
int main(void){
        char inb[16], oub[16], *inbp, *oubp;
        iconv_t id;
        size_t inl, oul;
        int rv;

        memcpy(inbp = inb, "\341\203\276", sizeof("\341\203\276"));
        inl = sizeof("\341\203\276") -1;
        oul = sizeof oub;
        oubp = oub;

        rv = 1;
        if((id = iconv_open("us-ascii"/*//TRANSLIT"*/, "utf-8")) ==
(iconv_t)-1)
                goto jleave;

        rv = 14;
        if(iconv(id, &inbp, &inl, &oubp, &oul) == (size_t)-1)
{
fprintf(stderr, "error %s %d==%d\n",strerror(errno),errno,errno==EILSEQ);
                goto jleave;
}

fprintf(stderr, "bummer\n");
jleave:
        if(id != (iconv_t)-1)
                iconv_close(id);

        return rv;
}

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