Simulink: Passing strings to s-functions

As of R2019b, you can't pass a string (e.g. a file path) to an s-function via string constant block. You can convert a string to an ASCII value array, pass it to s-function, and inside the s-function convert the array back to string. Note that this means you are limited to the ASCII table of characters. You can use the following function to construct string from s-function input: