I just meant to add a bit of info to an already excellent overview, not to detract from it. Yes, most of the rest of the section is about unrelated pitfalls. T

I just meant to add a bit of info to an already excellent overview, not to detract from it. Yes, most of the rest of the section is about unrelated pitfalls. The non-ASCII use-case is something that's often forgotten these days, and until you mentioned it here there was no indication in the document that you were aware of it. I.e. the section discusses "non-English" non-8-bit languages etc. But the most basic use of ctype.h is e.g. checking if something is in the 0-9a-zA-Z range for the purposes of a basic parser, and you can't do that portably in C without ctype.h, or effectively writing your own ctype.h implementation.