=> R0 = 3
R1 = pointer to address to read string from
R2 = length of output string (maximum of 255, <3 is undefined)
<= R0, R2 preserved
R1 = pointer to character after the inputs terminator
R3 = pointer to output string (up to 255 chars)
This call copies a string, truncating the right-hand side and appending an ellipsis (...) if its longer than the specified size.
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