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Interesting to compare this to the Hello World that's now possible with WASI and its fd_write function:

Here is the Hello World example for WASI in headerless C using clang. A little bit more code but also more general.

slen() returns 1 more than it should, or is it meant to include the '\0'?

Yes, you are right. This function should behave as the ordinary strlen function. Fixed.

Thanks for this, I hadn't seen it before. That example is much better commented and documented than mine.