Escape any non-printable chars in a string
text_strn:string(input:string,len:long,quoted:long)
input
the string to escape
len
maximum length of string to return (0 implies MAXSTRINGLEN)
quoted
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.