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* utf8_width() performance improvementsLukas Fleischer2011-07-021-39/+50
| | | | | | | | | * Sort character width lookup table by character ranges. * Use binary search instead of linear search for UTF-8 character width lookups which will speed up utf8_width() (O(log n) instead of O(n)). Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
* Add basic UTF-8 helper functionsLukas Fleischer2011-06-291-0/+333
Add utf8_width() and utf8_strwidth() which can be used to calculate the display width of a single character or a string, respectively. A lookup table is used to spot double width characters, as well as composing characters. There currently isn't any code to deal with ambigious characters. Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>