quickjs-tart

quickjs-based runtime for wallet-core logic
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href_extractor.c (2700B)

      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) Daniel Stenberg, <daniel@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.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  * SPDX-License-Identifier: curl
     22  *
     23  ***************************************************************************/
     24 
     25 /* <DESC>
     26  * Uses the "Streaming HTML parser" to extract the href pieces in a streaming
     27  * manner from a downloaded HTML.
     28  * </DESC>
     29  */
     30 /*
     31  * The HTML parser is found at https://github.com/arjunc77/htmlstreamparser
     32  */
     33 
     34 #include <stdio.h>
     35 #include <curl/curl.h>
     36 #include <htmlstreamparser.h>
     37 
     38 
     39 static size_t write_callback(void *buffer, size_t size, size_t nmemb,
     40                              void *hsp)
     41 {
     42   size_t realsize = size * nmemb, p;
     43   for(p = 0; p < realsize; p++) {
     44     html_parser_char_parse(hsp, ((char *)buffer)[p]);
     45     if(html_parser_cmp_tag(hsp, "a", 1))
     46       if(html_parser_cmp_attr(hsp, "href", 4))
     47         if(html_parser_is_in(hsp, HTML_VALUE_ENDED)) {
     48           html_parser_val(hsp)[html_parser_val_length(hsp)] = '\0';
     49           printf("%s\n", html_parser_val(hsp));
     50         }
     51   }
     52   return realsize;
     53 }
     54 
     55 int main(int argc, char *argv[])
     56 {
     57   char tag[1], attr[4], val[128];
     58   CURL *curl;
     59   HTMLSTREAMPARSER *hsp;
     60 
     61   if(argc != 2) {
     62     printf("Usage: %s URL\n", argv[0]);
     63     return EXIT_FAILURE;
     64   }
     65 
     66   curl = curl_easy_init();
     67 
     68   hsp = html_parser_init();
     69 
     70   html_parser_set_tag_to_lower(hsp, 1);
     71   html_parser_set_attr_to_lower(hsp, 1);
     72   html_parser_set_tag_buffer(hsp, tag, sizeof(tag));
     73   html_parser_set_attr_buffer(hsp, attr, sizeof(attr));
     74   html_parser_set_val_buffer(hsp, val, sizeof(val)-1);
     75 
     76   curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
     77   curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
     78   curl_easy_setopt(curl, CURLOPT_WRITEDATA, hsp);
     79   curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
     80 
     81   curl_easy_perform(curl);
     82 
     83   curl_easy_cleanup(curl);
     84 
     85   html_parser_cleanup(hsp);
     86 
     87   return EXIT_SUCCESS;
     88 }