char* GetLinksByTag(char* htmlcontent, char* url, char * tag_name, char * attribute)
{
// Buffers for the stream parser.
char tag[8];
char attr[20];
char val[1024];
// Links string.
char* links = malloc(1);
size_t links_length = 0;
size_t i; // Loop iterator
char* base = malloc(strlen(url) + 1);
strcpy(base, url);
// Initialize the parser
HTMLSTREAMPARSER *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);
links[0] = '\0';
const size_t document_size = strlen(htmlcontent);
const size_t tag_length = strlen(tag_name);
const size_t attr_length = strlen(attribute);
// Loop over document
for (i = 0; i < document_size; i++) {
html_parser_char_parse(hsp, htmlcontent[i]);
// Detect different html base
if (html_parser_cmp_tag(hsp, "base", 4) && html_parser_cmp_attr(hsp, "href", 4) && html_parser_is_in(hsp, HTML_VALUE_ENDED)) {
html_parser_val(hsp)[html_parser_val_length(hsp)] = '\0';
base = realloc(base, strlen(html_parser_val(hsp)) + 1);
strcpy(base, html_parser_val(hsp));
}
if (html_parser_cmp_tag(hsp, tag_name, tag_length)) {
if (html_parser_cmp_attr(hsp, attribute, attr_length)) {
if (html_parser_is_in(hsp, HTML_VALUE_ENDED)) {
html_parser_val(hsp)[html_parser_val_length(hsp)] = '\0';
char* link = FormatLink(base, html_parser_val(hsp));
// Plus 1 byte for the newline
size_t link_length = strlen(link) + 1;
// Plus 1 byte for the null terminator
links = realloc(links, links_length + link_length + 1);
strcat(links, link);
strcat(links, "\n");
links_length += link_length;
free(link);
}
}
}
}
/*release the hsp*/
html_parser_cleanup(hsp);
free(base);
return links;
}
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;
}