/ curl Public
make pingpong's sendf() use dynbuf #6004
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Curl_pp_vsendfuse a dynbuf for the send buffer, we avoid frequent malloc/realloc/free series. Test case 100 (FTP dir list PASV) does 7 fewer memory allocation calls after this in my test setup (132 => 125), curl 7.72.0 needed 140 calls for this.
Test case 103 makes 9 less now (130). Down from 149 in 7.72.0.
This PR adds
Curl_dyn_vaddfto the dynbuf API to make this possible.