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https://issues.apache.org/jira/browse/PROTON-2248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17154911#comment-17154911
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Andrew Stitcher commented on PROTON-2248:
-----------------------------------------

Given this is internal documentation - I'd rather suspect this is a doc error.

However we need to check all the uses of the 'S and 's' codes just to be sure 
they are correct in effect.

> [Proton-c] Codec pn_data_vfill() method has symbol and string types 
> interchanged.
> ---------------------------------------------------------------------------------
>
>                 Key: PROTON-2248
>                 URL: https://issues.apache.org/jira/browse/PROTON-2248
>             Project: Qpid Proton
>          Issue Type: Bug
>            Reporter: Kim van der Riet
>            Priority: Major
>
> TheĀ *{{pn_data_vfill()}}* method in codec.c:571 has the symbol and string 
> types interchanged. The function documentation states:
> {noformat}
> /* Format codes:
>    code: AMQP-type (arguments)
>    ...
>    S: symbol (char*)
>    s: string (char*)
>    ...
>  */
> {noformat}
> but uses these the other way around, ie {{s}} for symbol and {{S}} for string:
> {noformat}
>           if (code == 'S') {
>             err = pn_data_put_string(data, pn_bytes(size, start));
>           } else {
>             err = pn_data_put_symbol(data, pn_bytes(size, start));
>           }
> {noformat}
> Guidance is needed on whether to fix the reversal and keep the stated codes, 
> or reverse the codes.



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