bugText Extractor TXR - Bugs: bug #34653, :upcase and :downcase filters use...


bug #34653: :upcase and :downcase filters use inadequate C functions towupper and towlower.

Submitted by:  Kaz Kylheku <kkylheku>
Submitted on:  Tue 25 Oct 2011 07:41:44 PM UTC  
Category:  None Severity:  3 - Normal
Item Group:  Correctness Status:  Confirmed
Privacy:  Public Assigned to:  None
Originator Name:  Open/Closed:  Open
Component Version:  040 Operating System:  None
Fixed Release:  None Planned Release:  None
Architecture:  All ABI:  All

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Tue 25 Oct 2011 07:41:44 PM UTC, original submission:  

The C functions towupper and towlower can only be counted on to transform the English characters. Any other behavior is implementation dependent and influenced by locale, which brings in messy environment variables and portability issues. Txr's behavior should not be influenced by such committee-designed garbage.

We need upper and lower casing functions that simply work for the entire Unicode, across the scripts of all languages in which there is such a concept of case.

(For instance, perhaps Japanese hiragana might be mapped to katakana and vice versa, since katakana serves as a sort of alternate case, much like "block letters" in Latin-derived writing systems.)

Kaz Kylheku <kkylheku>
Project Administrator


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