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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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 https://curl.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/* <DESC>
* Uses the "Streaming HTML parser" to extract the href pieces in a streaming
* manner from a downloaded HTML.
* </DESC>
*/
/*
* The HTML parser is found at https://github.com/arjunc77/htmlstreamparser
*/
#include <stdio.h>
#include <curl/curl.h>
#include <htmlstreamparser.h>
static size_t write_callback(void *buffer, size_t size, size_t nmemb,
void *hsp)
{
size_t realsize = size * nmemb, p;
for(p = 0; p < realsize; p++) {
html_parser_char_parse(hsp, ((char *)buffer)[p]);
if(html_parser_cmp_tag(hsp, "a", 1))
if(html_parser_cmp_attr(hsp, "href", 4))
if(html_parser_is_in(hsp, HTML_VALUE_ENDED)) {
html_parser_val(hsp)[html_parser_val_length(hsp)] = '\0';
printf("%s\n", html_parser_val(hsp));
}
}
return realsize;
}
int main(int argc, char *argv[])
{
char tag[1], attr[4], val[128];
CURL *curl;
HTMLSTREAMPARSER *hsp;
if(argc != 2) {
printf("Usage: %s URL\n", argv[0]);
return EXIT_FAILURE;
}
curl = curl_easy_init();
hsp = html_parser_init();
html_parser_set_tag_to_lower(hsp, 1);
html_parser_set_attr_to_lower(hsp, 1);
html_parser_set_tag_buffer(hsp, tag, sizeof(tag));
html_parser_set_attr_buffer(hsp, attr, sizeof(attr));
html_parser_set_val_buffer(hsp, val, sizeof(val)-1);
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, hsp);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_perform(curl);
curl_easy_cleanup(curl);
html_parser_cleanup(hsp);
return EXIT_SUCCESS;
}