CURLOPT_ERRORBUFFER.3: Improve example

.nf

curl = curl_easy_init();

if(curl) {

  char error[CURL_ERROR_SIZE]

  CURLcode res;

  char errbuf[CURL_ERROR_SIZE];

  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

  /* provide a buffer to store errors in */

  curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, error);

  curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);

  /* Perform the request */

  curl_easy_perform(curl);

  /* set the error buffer as empty before performing a request */

  errbuf[0] = 0;

  /* perform the request */

  res = curl_easy_perform(curl);

  /* if the request did not complete correctly, show the error information.

  if no detailed error information was written to errbuf show the more generic

  information from curl_easy_strerror instead.

  */

  if(res != CURLE_OK) {

    size_t len = strlen(errbuf);

    fprintf(stderr, "\nlibcurl: (%d) ", res);

    if(len)

      fprintf(stderr, "%s%s", errbuf, ((errbuf[len - 1] != '\n') ? "\n" : ""));

    else

      fprintf(stderr, "%s\n", curl_easy_strerror(res));

  }

}

.fi

.SH AVAILABILITY