[Bug localedata/19575] New: Status of GB18030 tables

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19575

            Bug ID: 19575
           Summary: Status of GB18030 tables
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: localedata
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: libc-locales at sourceware dot org
  Target Milestone: ---
             Flags: security-

In this commit:

commit 60cc4a18e6a2c865e250609a3021fa4ff2b57650
Author: Andreas Schwab <schwab@linux-m68k.org>
Date:   Mon Feb 6 13:30:45 2012 +0100

    Complete GB18030 charmap

Andreas updated the localedata/charmaps/GB18030 with additional mappings.  The
provenance of those is unclear.  They do not agree with the mapping table here:

http://source.icu-project.org/repos/icu/data/trunk/charset/data/xml/gb-18030-2000.xml

The difference is related to this choice in the glibc charmap

% <UE78D>     /xa6/xd9         <Private Use>
% <UE78E>     /xa6/xda         <Private Use>
% <UE78F>     /xa6/xdb         <Private Use>
% <UE790>     /xa6/xdc         <Private Use>
% <UE791>     /xa6/xdd         <Private Use>
% <UE792>     /xa6/xde         <Private Use>
% <UE793>     /xa6/xdf         <Private Use>
% <UE794>     /xa6/xec         <Private Use>
% <UE795>     /xa6/xed         <Private Use>
% <UE796>     /xa6/xf3         <Private Use>

versus:

<UFE10>     /xa6/xd9         PRESENTATION FORM FOR VERTICAL COMMA
<UFE11>     /xa6/xdb         PRESENTATION FORM FOR VERTICAL IDEOGRAPHIC COMMA
<UFE12>     /xa6/xda         PRESENTATION FORM FOR VERTICAL IDEOGRAPHIC FULL
STOP
<UFE13>     /xa6/xdc         PRESENTATION FORM FOR VERTICAL COLON
<UFE14>     /xa6/xdd         PRESENTATION FORM FOR VERTICAL SEMICOLON
<UFE15>     /xa6/xde         PRESENTATION FORM FOR VERTICAL EXCLAMATION MARK
<UFE16>     /xa6/xdf         PRESENTATION FORM FOR VERTICAL QUESTION MARK
<UFE17>     /xa6/xec         PRESENTATION FORM FOR VERTICAL LEFT WHITE
LENTICULAR BRACKET
<UFE18>     /xa6/xed         PRESENTATION FORM FOR VERTICAL RIGHT WHITE
LENTICULAR BRAKCET
<UFE19>     /xa6/xf3         PRESENTATION FORM FOR VERTICAL HORIZONTAL ELLIPSIS

It is not clear to me which one is correct.  Emacs chooses the <UE78D>
mappings, too.

Maybe the mapping changed over time, or there are conflicting practices.  Even
if it's a Private Use codepoint on the Unicode site, there should be a definite
mapping.

Further references:

http://www.unicode.org/mail-arch/unicode-ml/y2002-m07/0555.html
http://www.unicode.org/mail-arch/unicode-ml/y2003-m04/0277.html

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