[Bug 1048324] Reference to perl (5.18.1-288.fc20.x86_64) utf8 string is Invalid Argument to open

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1048324

Petr Pisar <ppisar at redhat.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |CLOSED
                URL|                            |https://rt.perl.org//Public
                   |                            |/Bug/Display.html?id=109828
         Resolution|---                         |NOTABUG
        Last Closed|                            |2014-01-07 09:33:51



--- Comment #1 from Petr Pisar <ppisar at redhat.com> ---
The truth comes when running the code with enabled warnings:

# perl -we 'my $s = qq{\x{2019}}; open(my $f, q{<}, \$s) or die $!' 2>&1 |
splain
Strings with code points over 0xFF may not be mapped into in-memory file
        handles (#1)
    (W utf8) You tried to open a reference to a scalar for read or append
    where the scalar contained code points over 0xFF.  In-memory files
    model on-disk files and can only contain bytes.

This is result of

commit b38d579d7e4fdb6e4abade72630ea777d8c509d9
Author: Tony Cook <tony at develop-help.com>
Date:   Fri Jan 25 09:56:01 2013 +1100

    handle reading from a SVf_UTF8 scalar

    if the scalar can be downgradable, it is downgraded and the read succeeds.

    Otherwise the read fails, producing a warning if enabled and setting
    errno/$! to EINVAL.

which comes from perl bug report
<https://rt.perl.org//Public/Bug/Display.html?id=109828>.

The overall conclusion is that file consists always of bytes.

If you don't agree, please open a request at upstream
<https://rt.perl.org/Public/>.

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