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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 2012 - 2016, Daniel Stenberg, <daniel (at) haxx.se>, et al.
      9  *
     10  * This software is licensed as described in the file COPYING, which
     11  * you should have received as part of this distribution. The terms
     12  * are also available at https://curl.haxx.se/docs/copyright.html.
     13  *
     14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
     15  * copies of the Software, and permit persons to whom the Software is
     16  * furnished to do so, under the terms of the COPYING file.
     17  *
     18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
     19  * KIND, either express or implied.
     20  *
     21  ***************************************************************************/
     22 
     23 /* <DESC>
     24  * Uses the "Streaming HTML parser" to extract the href pieces in a streaming
     25  * manner from a downloaded HTML.
     26  * </DESC>
     27  */
     28 /*
     29  * The HTML parser is found at http://code.google.com/p/htmlstreamparser/
     30  */
     31 
     32 #include <stdio.h>
     33 #include <curl/curl.h>
     34 #include <htmlstreamparser.h>
     35 
     36 
     37 static size_t write_callback(void *buffer, size_t size, size_t nmemb,
     38                              void *hsp)
     39 {
     40   size_t realsize = size * nmemb, p;
     41   for(p = 0; p < realsize; p++) {
     42     html_parser_char_parse(hsp, ((char *)buffer)[p]);
     43     if(html_parser_cmp_tag(hsp, "a", 1))
     44       if(html_parser_cmp_attr(hsp, "href", 4))
     45         if(html_parser_is_in(hsp, HTML_VALUE_ENDED)) {
     46           html_parser_val(hsp)[html_parser_val_length(hsp)] = '\0';
     47           printf("%s\n", html_parser_val(hsp));
     48         }
     49   }
     50   return realsize;
     51 }
     52 
     53 int main(int argc, char *argv[])
     54 {
     55   char tag[1], attr[4], val[128];
     56   CURL *curl;
     57   HTMLSTREAMPARSER *hsp;
     58 
     59   if(argc != 2) {
     60     printf("Usage: %s URL\n", argv[0]);
     61     return EXIT_FAILURE;
     62   }
     63 
     64   curl = curl_easy_init();
     65 
     66   hsp = html_parser_init();
     67 
     68   html_parser_set_tag_to_lower(hsp, 1);
     69   html_parser_set_attr_to_lower(hsp, 1);
     70   html_parser_set_tag_buffer(hsp, tag, sizeof(tag));
     71   html_parser_set_attr_buffer(hsp, attr, sizeof(attr));
     72   html_parser_set_val_buffer(hsp, val, sizeof(val)-1);
     73 
     74   curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
     75   curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
     76   curl_easy_setopt(curl, CURLOPT_WRITEDATA, hsp);
     77   curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
     78 
     79   curl_easy_perform(curl);
     80 
     81   curl_easy_cleanup(curl);
     82 
     83   html_parser_cleanup(hsp);
     84 
     85   return EXIT_SUCCESS;
     86 }
     87