acs_mail_lite::utils::build_subject (private)

 acs_mail_lite::utils::build_subject [ -charset charset ] subject

Defined in packages/acs-mail-lite/tcl/utils-procs.tcl

Encode the subject, using quoted-printable, of an email message and trim long lines. Depending on the available mime package version, it uses either the mime::word_encode proc to do it or local code (word_encode is buggy in mime < 1.5.2 ) A purely tcllib based version would be [mime::word_encode utf-8 quoted-printable $subject] but that would miss the safety-belt for newline handling

Switches:

-charset

(defaults to "UTF-8") (optional)

Parameters:

subject

Partial Call Graph (max 5 caller/called nodes):

Testcases:

No testcase defined.

Source code:

    set charset [string toupper $charset]
    set charset_code [ns_encodingforcharset $charset]

    # maxlen for each line
    # 69 = 76 - 7 where 7 is for "=?"+"?Q?+"?="
    set maxlen [expr {69 - [string length $charset]}]

    #
    # Make sure, the subject line does not have surrounding white
    # space/new lines
    #
    set subject [string trim $subject]

    if {[regsub -all -- {[\r\n]} $subject " " s]} {
        ad_log warning "subject line contains line breaks (replaced by space): '$subject' -> '$s'"
        set subject $s
    }

    #
    # set up variables for loop
    #
    set result ""
    set line ""
    set i 0

    set subject_length [string length $subject]
    while { $i < $subject_length } {
        set chunk [string index $subject $i]

        # encode that chunk
        set chunk [encoding convertto $charset_code "$chunk"]
        if { $chunk eq "\x3F" } {
            # ER: workaround (kludge!) for tcllib error
            set chunk "=3F"
        } else {
            set chunk [mime::qp_encode "$chunk" 1 0]
        }

        set newline $line
        append newline $chunk

        if { [string length $newline] <= $maxlen } {
            append line $chunk
        } else {
            append result "=?$charset?Q?$line?=\n "
            set line $chunk
        }
        incr i
    }
    if { $line ne "" } {
        append result "=?$charset?Q?$line?="
    }

    return $result

XQL Not present:

Generic, PostgreSQL, Oracle