LPRng Reference Manual: 3 May 2004 (For LPRng-3.8.27)
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# 21.3. Message Format

Each message is encoded as a URI escaped string. That is, non-alphanumeric characters are encoded as the 3 character sequence %xx, where xx is the hexadecimal value of the character. The message has the format key=value, where key indicates the message type. For example:

        dump=host=h4.private%0aprinter=t1%0aprocess=1613%0a
        update_time=1999-03-23-20:32:17.148%0a\
        value=queue=holdall 0%25250aprinting_aborted=0x0%25250a\
        printing_disabled=0x0%25250aspooling_disabled=\
        0x0%25250a%250a%0a

The following keys are used:

1. dump A status dump of the current contents of a print queue.

Each message has a set of headers and a value. For example, the decoded dump message from the previous section would be:

        host=h4.private
        printer=t1
        process=1613
        update_time=1999-03-23-20:32:17.148
        value=queue=holdall 0%250aprinting_aborted=0x0%250a\
        printing_disabled=0x0%250aspooling_disabled=0x0%250a%0a

Each line consists of a key and a value. The host key indicates the host name, printer is the print queue, process is the process which generated the report or action, update_time is the time at which the report was generated, and value is the value of the report.

The decoded value of the above report is:

        queue='holdall 0%0aprinting_aborted=0x0%0aprinting_disabled=0x0%0a\
        spooling_disabled=0x0%0a

The queue key provides the current value of the queue control file.

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