For UTF-8 string that are nul terminated, strlen() will return the length, in bytes, of that string.
Perhaps. But perhaps not.
UTF-8 is very much variable length and as such, it can return incorrect length because some characters span several bytes. Unicode is a tricky topic.
Originally Posted by Adak
io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
Originally Posted by Salem
You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.
Outside of your DOS world, your header file is meaningless.