Basic function to macro

[DGvMDjzh]

I want to turn this simple function into a macro.
Can anyone help me out?

unsigned int Len(const char* s) {
 unsigned int i;
 for(i = 0; s[i] != '\0'; i++);
 return i;
}

[Peter87]

What is the advantage of using a macro when you can use a function?

[Duthomhas]

Forced inlining in C.

Even then, you are wasting your time. Just use strlen(), which is highly optimized for your PC.