Summarizing our discussion, I made the following changes in the attached
files:
1. Code style was fixed.
2. The 'ftp' part was removed. Current options:
CURLOPT_SOURCE_HOST
CURLOPT_SOURCE_PORT
CURLOPT_SOURCE_USERPWD
CURLOPT_SOURCE_PATH
3. Configurable PASV/PORT connection for source/target host. New option:
CURLOPT_PASV_HOST - Indicates whether source or target host is passive.
0 - target host, 1 - source host
There is a small problem when switching passive to be a source host:
Due to FTP limitation, STOR/APPE command performed in parallel to RETR
command (RETR side is passive now and can't respond). It caused to
create an empty file on the target host when there is no file on the
source host - the error returned after STOR/APPE command was performed.
4. Curl_debug() provides the same data for both callbacks.
5. There are no memory leaks according to README.memoryleak approach.

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