function::text_strn.3stap man page
function::text_strn — Escape any non-printable chars in a string
the string to escape
maximum length of string to return (0 implies MAXSTRINGLEN)
put double quotes around the string. If input string is truncated it will have “...” after the second quote
This function accepts a string of designated length, and any ASCII characters that are not printable are replaced by the corresponding escape sequence in the returned string.