gistfile1.c

#include <stdio.h>
#include <curl/curl.h>

int main (char** argv, int argc) {
  CURL *curl;
  CURLcode res;
  char* url = NULL;
  double filesize;
 
  curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "sftp://localhost/Users/XXX/test.txt");
    curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);

    curl_easy_setopt(curl, CURLOPT_USERNAME, "XXX");
    curl_easy_setopt(curl, CURLOPT_SSH_PUBLIC_KEYFILE, "XXX");
    curl_easy_setopt(curl, CURLOPT_SSH_PRIVATE_KEYFILE, "XXX");
 
    /* Perform the request, res will get the return code */ 
    res = curl_easy_perform(curl);
    /* Check for errors */ 
    if(res != CURLE_OK)
      fprintf(stderr, "curl_easy_perform() failed: %s\n",
              curl_easy_strerror(res));

    curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &url);
    curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &filesize);
    printf("URL: %s\n", url);
    printf("FILESIZE: %0.0f\n", filesize);

    /* always cleanup */ 
    curl_easy_cleanup(curl);
  }
  return 0;
}