/**
* \brief Remove input plugin from supportedCollectors tag
*
* \param info tool configuration
* \return 0 on success
*/
int remove_supported(conf_info_t *info)
{
int i;
xmlNodePtr children1;
xmlXPathObjectPtr xpath_obj_file = eval_xpath(info, TAG_SUPPORTED);
if (!xpath_obj_file) {
return 1;
}
for (i = 0; i < xpath_obj_file->nodesetval->nodeNr; i++) {
children1 = xpath_obj_file->nodesetval->nodeTab[i]->children;
while (children1) {
if ((!strncmp ((char*) children1->name, "name", strlen ("name") + 1))
&& (!xmlStrncmp (children1->children->content, (xmlChar *) info->name, xmlStrlen ((xmlChar *)info->name) + 1))) {
/* element found*/
xmlUnlinkNode(children1);
xmlFreeNode(children1);
return 0;
}
children1 = children1->next;
}
}
return 0;
}
int main(int argc, char *argv[]) {
char userpwd[USERPWD_LENGTH];
char *cache_data, *new_cache_data, *cache_ptr, *cache_file_path, *screen_name;
size_t cache_size, old_cache_size;
long cache_space;
config *cfg;
CURL *curl;
CURLcode res;
long response_code;
memory friends_xml = {NULL, 0};
xmlDocPtr doc;
xmlXPathObjectPtr xpath_result;
xmlNodeSetPtr nodeset;
FILE* cache_file;
unsigned int i, length;
/* load configuration */
cfg = parse_config();
if(!cfg)
COMPLAIN_AND_EXIT("Error: Could not load or parse configuration. Make sure that the " \
"configuration file exists, is readable and contains the necessary " \
"information (see the README for more information).\n");
SNPRINTF(userpwd, USERPWD_LENGTH, "%s:%s", cfg->username, cfg->password);
free(cfg);
/* retrieve friends XML */
curl = curl_easy_init();
if (curl) {
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_to_memory);
curl_easy_setopt(curl, CURLOPT_USERAGENT, USERAGENT_HEADER);
curl_easy_setopt(curl, CURLOPT_URL, TWITTER_FRIENDS_URL);
curl_easy_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_easy_setopt(curl, CURLOPT_USERPWD, userpwd);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &friends_xml);
res = curl_easy_perform(curl);
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
curl_easy_cleanup(curl);
if (!friends_xml.memory)
COMPLAIN_AND_EXIT("Error: Received no data from Twitter.\n");
if (res != CURLE_OK) {
free(friends_xml.memory);
COMPLAIN_AND_EXIT("(Twitter) Error: %s\n", curl_easy_strerror(res));
}
if (!(response_code == OK || response_code == NOT_MODIFIED)) {
free(friends_xml.memory);
COMPLAIN_AND_EXIT("(Twitter) Error: %s (#%lu)\n", response_message(response_code), response_code);
}
/* parse friends XML */
doc = xmlParseMemory(friends_xml.memory, friends_xml.size);
free(friends_xml.memory);
if (!doc)
COMPLAIN_AND_EXIT("Error: Unable to parse Twitter's XML response.\n");
xpath_result = eval_xpath(doc, (xmlChar*) "//screen_name");
if (!xpath_result) {
xmlFreeDoc(doc);
xmlCleanupParser();
return 0; // no data to process - should perhaps empty cache
}
nodeset = xpath_result->nodesetval;
cache_size = nodeset->nodeNr*15; // assuming each screen name being avg. 15 chars long
cache_space = cache_size;
cache_data = malloc(cache_size);
cache_ptr = cache_data;
/* prepare data for writing */
for (i = 0; i < nodeset->nodeNr; i++) {
screen_name = (char*)xmlNodeListGetString(doc, nodeset->nodeTab[i]->xmlChildrenNode, 1);
length = strlen(screen_name) + 2;
cache_space -= length;
if (cache_space <= 0) {
old_cache_size = cache_size;
cache_size = MAX(cache_size*2, cache_size + length);
cache_space = cache_space + (cache_size - old_cache_size);
new_cache_data = realloc(cache_data, cache_size);
if (!new_cache_data) {
free(cache_data);
xmlXPathFreeObject(xpath_result);
xmlFreeDoc(doc);
xmlCleanupParser();
COMPLAIN_AND_EXIT("Error: Could not allocate memory.\n");
}
cache_ptr = new_cache_data + (cache_ptr - cache_data);
cache_data = new_cache_data;
}
if (i == 0) {
strncpy(cache_ptr, screen_name, length - 1);
cache_ptr += length-2;
} else {
SNPRINTF(cache_ptr, length, " %s", screen_name);
cache_ptr += length-1;
}
free(screen_name);
}
xmlXPathFreeObject(xpath_result);
xmlFreeDoc(doc);
xmlCleanupParser();
*cache_ptr = '\0';
/* write data to cache file */
cache_file_path = get_absolute_path(CACHE_FILENAME);
cache_file = fopen(cache_file_path, "w+");
if (!cache_file)
COMPLAIN_AND_EXIT("Error: Could not open cache file (%s)\n", strerror(errno));
fputs(cache_data, cache_file);
fclose(cache_file);
free(cache_file_path);
}
return 0;
}
