2009/5/12 Corinna Vinschen: >> Trouble is, there's the thorny issue of the "CJK Ambiguous Width" >> category of characters, which consists of things like Greek and >> Cyrillic letters as well as line drawing symbols. Those have a width >> of 1 in Western use, yet with CJK fonts they have a width of 2. That's >> why Markus Kuhn's code includes the mk_wcswidth_cjk() variant. > > We should use the standard variation alone, imho.
I'm not sure that CJK users would be happy with that. See MinTTY issue 88 for my misguided attempts to dismiss this as a legacy issue: http://code.google.com/p/mintty/issues/detail?id=88 In comment 8 on that, "deenheart" mentioned that he was working on a fix for wcwidth(). I don't know what he had in mind, but I'd suspect something based on an environment variable setting. > And we need some workaround for UTF-16 systems like Cygwin. > Unfortunately, surrogate pairs only work well as part of a string, not > as standalone chars. So wcwidth would return -1 for each single char, > but wcswidth could be tweaked to handle them gracefully. Looking at the ranges in wcwidth.c, it might be possible to decide the width of a surrogate pair based on the high surrogate only, and then treat the low surrogate as a combining character with length 0. Andy -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
