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https://gitlab.com/gnuwget/wget2.git
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130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
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* Copyright(c) 2013 Tim Ruehsen
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* Copyright(c) 2015-2018 Free Software Foundation, Inc.
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*
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* This file is part of libwget.
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*
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* Libwget is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Libwget is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libwget. If not, see <https://www.gnu.org/licenses/>.
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*
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*
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* Example for HTML parsing using libwget
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*
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* Changelog
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* 03.01.2014 Tim Ruehsen created
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*
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* Demonstrate how to extract URIs from HTML files using callback functions.
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* We don't care about character encoding in this example.
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*
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*/
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#include <unistd.h>
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#include <wget.h>
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static void html_parse_localfile(const char *fname)
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{
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char *data, *data_allocated;
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size_t len;
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if ((data_allocated = data = wget_read_file(fname, &len))) {
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const char *encoding = NULL;
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if ((unsigned char)data[0] == 0xFE && (unsigned char)data[1] == 0xFF) {
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// Big-endian UTF-16
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encoding = "UTF-16BE";
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// adjust behind BOM, ignore trailing single byte
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data += 2;
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len -= 2;
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} else if ((unsigned char)data[0] == 0xFF && (unsigned char)data[1] == 0xFE) {
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// Little-endian UTF-16
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encoding = "UTF-16LE";
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// adjust behind BOM
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data += 2;
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len -= 2;
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} else if ((unsigned char)data[0] == 0xEF && (unsigned char)data[1] == 0xBB && (unsigned char)data[2] == 0xBF) {
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// UTF-8
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encoding = "UTF-8";
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// adjust behind BOM
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data += 3;
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len -= 3;
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}
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if (encoding)
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printf("URI encoding '%s' set by BOM\n", encoding);
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if (!wget_strncasecmp_ascii(encoding, "UTF-16", 6)) {
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size_t n;
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char *utf8;
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len -= len & 1; // ignore single trailing byte, else charset conversion fails
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if (wget_memiconv(encoding, data, len, "UTF-8", &utf8, &n) == 0) {
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printf("Convert non-ASCII encoding '%s' to UTF-8\n", encoding);
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wget_xfree(data_allocated);
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data_allocated = data = utf8;
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} else {
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printf("Failed to convert non-ASCII encoding '%s' to UTF-8, skip parsing\n", encoding);
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return;
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}
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}
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wget_html_parsed_result_t *res = wget_html_get_urls_inline(data, NULL, NULL);
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if (encoding) {
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if (res->encoding && wget_strcasecmp_ascii(encoding, res->encoding))
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printf("Encoding '%s' as stated in document has been ignored\n", encoding);
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}
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for (int it = 0; it < wget_vector_size(res->uris); it++) {
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wget_html_parsed_url_t *html_url = wget_vector_get(res->uris, it);
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wget_string_t *url = &html_url->url;
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printf(" %s.%s '%.*s'\n", html_url->dir, html_url->attr, (int) url->len, url->p);
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}
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wget_xfree(data_allocated);
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wget_html_free_urls_inline(&res);
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}
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}
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int main(int argc, const char *const *argv)
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{
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/*
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wget_global_init(
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WGET_DEBUG_STREAM, stderr,
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WGET_ERROR_STREAM, stderr,
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WGET_INFO_STREAM, stdout,
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NULL);
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*/
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if (!isatty(STDIN_FILENO)) {
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// read HTML data from STDIN
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html_parse_localfile("-");
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} else {
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// parse CSS files given as arguments
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int argpos;
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for (argpos = 1; argpos < argc; argpos++) {
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printf("%s:\n", argv[argpos]);
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// use '-' as filename for STDIN
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html_parse_localfile(argv[argpos]);
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}
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}
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return 0;
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}
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