LJ::text_trim — truncate string according to requirements on byte length, char length, or both. "char length" means number of UTF-8 characters if $LJ::UNICODE is set, or the same thing as byte length otherwise.
LJ::text_trim(text, byte_max, char_max);
text. the string to trim
byte_max. maximum allowed length in bytes; if 0, there's no restriction
char_max. maximum allowed length in chars; if 0, there's no restriction
cgi-bin/ljlib.pl
the truncated string.