There is no such one thing as "breaking lines" in Unicode. There are a thousand slightly different ways to do it, in every single locale. That is explicit in th

There is no such one thing as "breaking lines" in Unicode. There are a thousand slightly different ways to do it, in every single locale. That is explicit in the introduction to the first beast you linked yourself... And assuming that a spec (especially a super-complex one, that moreover constantly evolves), is devoid of ambiguities, and makes every implementation behave in the same way, or even that every implementation implements the largest part of it, is being a tad idealistic. Sometimes it's all about common sense. For most tasks I will happily continue using strchr or my manual loop and be done with it, thanks.