CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DIRLISTONLY, long listonly);
For POP3 a parameter of 1 tells the library to list the email message or messages on the POP3 server. This can be used to change the default behavior of libcurl, when combined with a URL that contains a message ID, to perform a "scan listing" which can then be used to determine the size of an email.
Note: For FTP this causes a NLST command to be sent to the FTP server. Beware that some FTP servers list only files in their response to NLST; they might not include subdirectories and symbolic links.
Setting this option to 1 also implies a directory listing even if the URL doesn't end with a slash, which otherwise is necessary.
Do NOT use this option if you also use CURLOPT_WILDCARDMATCH(3) as it will effectively break that feature then.
CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/"); /* list only */ curl_easy_setopt(curl, CURLOPT_DIRLISTONLY, 1L); ret = curl_easy_perform(curl); curl_easy_cleanup(curl); }