This procedure is defined in the server but not documented via ad_proc or proc_doc and may be intended as a private interface.
The procedure is defined as:
proc base64::ADD {x} {
# The line length check is always done before appending so
# that we don't get an extra newline if the output is a
# multiple of $maxlen chars long.
upvar 1 maxlen maxlen length length result result wrapchar wrapchar
if {$maxlen && $length >= $maxlen} {
append result $wrapchar
set length 0
}
append result $x
incr length
return
}
