text: /***************************************************************************
   *                                  _   _ ____  _
   *  Project                     ___| | | |  _ \| |
   *                             / __| | | | |_) | |
   *                            | (__| |_| |  _ <| |___
   *                             \___|\___/|_| \_\_____|
   *
   * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
   *
   * This software is licensed as described in the file COPYING, which
   * you should have received as part of this distribution. The terms
   * are also available at http://curl.haxx.se/docs/copyright.html.
   *
   * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   * copies of the Software, and permit persons to whom the Software is
   * furnished to do so, under the terms of the COPYING file.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ***************************************************************************/
  #include <curl/curl.h>
  #include <stdio.h>
  
  struct callback_data {
    FILE *output;
  };
  
  static long file_is_coming(struct curl_fileinfo *finfo,
                             struct callback_data *data,
                             int remains);
  
  static long file_is_downloaded(struct callback_data *data);
  
  static size_t write_it(char *buff, size_t size, size_t nmemb,
                         void *cb_data);
  
  int main(int argc, char **argv)
  {
    int rc = CURLE_OK;
  
    /* curl easy handle */
    CURL *handle;
  
    /* help data */
    struct callback_data data = { 0 };
  
    /* global initialization */
    rc = curl_global_init(CURL_GLOBAL_ALL);
    if(rc)
      return rc;
  
    /* initialization of easy handle */
    handle = curl_easy_init();
    if(!handle) {
      curl_global_cleanup();
      return CURLE_OUT_OF_MEMORY;
    }
  
    /* turn on wildcard matching */
    curl_easy_setopt(handle, CURLOPT_WILDCARDMATCH, 1L);
  
    /* callback is called before download of concrete file started */
    curl_easy_setopt(handle, CURLOPT_CHUNK_BGN_FUNCTION, file_is_coming);
  
    /* callback is called after data from the file have been transferred */
    curl_easy_setopt(handle, CURLOPT_CHUNK_END_FUNCTION, file_is_downloaded);
  
    /* this callback will write contents into files */
    curl_easy_setopt(handle, CURLOPT_WRITEFUNCTION, write_it);
  
    /* put transfer data into callbacks */
    curl_easy_setopt(handle, CURLOPT_CHUNK_DATA, &data);
    curl_easy_setopt(handle, CURLOPT_WRITEDATA, &data);
  
    /* curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L); */
  
    /* set an URL containing wildcard pattern (only in the last part) */
    if(argc == 2)
      curl_easy_setopt(handle, CURLOPT_URL, argv[1]);
    else
      curl_easy_setopt(handle, CURLOPT_URL, "ftp://example.com/test/*");
  
    /* and start transfer! */
    rc = curl_easy_perform(handle);
  
    curl_easy_cleanup(handle);
    curl_global_cleanup();
    return rc;
  }
  
  static long file_is_coming(struct curl_fileinfo *finfo,
                             struct callback_data *data,
                             int remains)
  {
    printf("%3d %40s %10luB ", remains, finfo->filename,
           (unsigned long)finfo->size);
  
    switch(finfo->filetype) {
    case CURLFILETYPE_DIRECTORY:
      printf(" DIR\n");
      break;
    case CURLFILETYPE_FILE:
      printf("FILE ");
      break;
    default:
      printf("OTHER\n");
      break;
    }
  
    if(finfo->filetype == CURLFILETYPE_FILE) {
      /* do not transfer files >= 50B */
      if(finfo->size > 50) {
        printf("SKIPPED\n");
        return CURL_CHUNK_BGN_FUNC_SKIP;
      }
  
      data->output = fopen(finfo->filename, "w");
      if(!data->output) {
        return CURL_CHUNK_BGN_FUNC_FAIL;
      }
    }
  
    return CURL_CHUNK_BGN_FUNC_OK;
  }
  
  static long file_is_downloaded(struct callback_data *data)
  {
    if(data->output) {
      printf("DOWNLOADED\n");
      fclose(data->output);
      data->output = 0x0;
    }
    return CURL_CHUNK_END_FUNC_OK;
  }
  
  static size_t write_it(char *buff, size_t size, size_t nmemb,
                         void *cb_data)
  {
    struct callback_data *data = cb_data;
    size_t written = 0;
    if(data->output)
      written = fwrite(buff, size, nmemb, data->output);
    else
      /* listing output */
      written = fwrite(buff, size, nmemb, stdout);
    return written;
  }
  