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Fixed sized integers are useful in two situations (that I can think of); if you're interfacing with a language that doesn't use the same integer size as your C compiler, or if you're relying on integers being a certain width (maybe you're casting between integers and non-integers, or writing a certain number of bytes to a binary file).

I doubt either of these situations come up when dealing with line sizes in a text editor.

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And a third situation: Writing device drivers interfacing with hardware registers of specific sizes, although you should use `{u}int_least<N>_t` for that, to give the compiler some leeway with alignment.

There are many cases where using fixed size types can save a significant amount of memory (and your application is constrained by memory on some platform) or CPU time (design to minimize cache misses happens all the time in high performance applications like games).

Neither of these situations is happening in a text editor application though.

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