[Bug locale/31859] New: Transliteration rules with two input characters like "ḌḌ" "DDH" do not work.

["maiku.fabian at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31859

            Bug ID: 31859
           Summary: Transliteration rules with two input characters like
                    "ḌḌ" "DDH" do not work.
           Product: glibc
           Version: 2.39
            Status: NEW
          Severity: normal
          Priority: P2
         Component: locale
          Assignee: unassigned at sourceware dot org
          Reporter: maiku.fabian at gmail dot com
  Target Milestone: ---

See: https://sourceware.org/pipermail/libc-alpha/2024-May/156769.html

If transliteration rules like this:

translit_start
"ḌḌ" "DDH"
"ḍḍ" "ddh"
"Ḍḍ" "Ddh"
translit_en

are used in the LC_CTYPE section of a locale, they don’t work.

These are in our new scn_IT locale, but commented out for the moment because
they do not work.

If localedata/locales/translit_combining is not changed, the rules for the
single characters Ḍ U+01E0C and ḍ U+1E0D from translit_combining did always win
when I tested, the longer input sequences "ḌḌ", "ḍḍ", and "Ḍḍ" were never used.

But when I commented out these short single characters transliteration rules in
translit_combining like this:

diff --git a/localedata/locales/translit_combining
b/localedata/locales/translit_combining
index ce2f19eee1..6f879d9caf 100644
--- a/localedata/locales/translit_combining
+++ b/localedata/locales/translit_combining
@@ -2486,9 +2486,9 @@ translit_start
 % LATIN SMALL LETTER D WITH DOT ABOVE
 <U1E0B> <U0064>
 % LATIN CAPITAL LETTER D WITH DOT BELOW
-<U1E0C> <U0044>
+%<U1E0C> <U0044>
 % LATIN SMALL LETTER D WITH DOT BELOW
-<U1E0D> <U0064>
+%<U1E0D> <U0064>
 % LATIN CAPITAL LETTER D WITH LINE BELOW
 <U1E0E> <U0044>
 % LAT


then

bash-5.2# echo 'ḌḌ'|iconv -f UTF-8 -t ASCII//translit
^C
bash-5.2#

uses 100% CPU and never stops until I stop it with Control-C.

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