On Thu, 7 Aug 2025, Yoshimasa Ohno via curl-library wrote:

In the application, I am trying to specify the retrieval range in CURLOPT_RANGE and write incoming data through CURLOPT_WRITEFUNCTION.

As far as I can tell, the callback to CURLOPT_WRITEFUNCTION doesn't seem to pass over data outside the range specified by CURLOPT_RANGE. Is this a coincidence? Or is it designed that way?

It is designed that way. You ask for a range, you get that range.

Since the FTP protocol does not have a range specification (end-of-range specification) mechanism, we expect that the libcurl side is designed to ignore out-of-range data.

curl makes sure to deliver what the user asks for! FTP has a command to instruct the server where to start reading from, and then curl stops reading at the end of the range. Easy peacy!

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