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#include "rssparser.h"
#include <cstring>
#include <ctime>
#include <libxml/tree.h>
#include "utils.h"
namespace rsspp {
std::string RssParser::w3cdtf_to_rfc822(const std::string& w3cdtf)
{
if (w3cdtf.empty()) {
return "";
}
struct tm stm;
memset(&stm, 0, sizeof(stm));
stm.tm_mday = 1;
char* ptr = strptime(w3cdtf.c_str(), "%Y", &stm);
if (ptr != nullptr) {
ptr = strptime(ptr, "-%m", &stm);
} else {
return "";
}
if (ptr != nullptr) {
ptr = strptime(ptr, "-%d", &stm);
}
if (ptr != nullptr) {
ptr = strptime(ptr, "T%H", &stm);
}
if (ptr != nullptr) {
ptr = strptime(ptr, ":%M", &stm);
}
if (ptr != nullptr) {
ptr = strptime(ptr, ":%S", &stm);
}
int offs = 0;
if (ptr != nullptr) {
if (ptr[0] == '+' || ptr[0] == '-') {
unsigned int hour, min;
if (sscanf(ptr + 1, "%02u:%02u", &hour, &min) == 2) {
offs = 60 * 60 * hour + 60 * min;
if (ptr[0] == '+') {
offs = -offs;
}
stm.tm_gmtoff = offs;
}
} else if (ptr[0] == 'Z') {
stm.tm_gmtoff = 0;
}
}
// tm_isdst will force mktime to consider DST, like localtime(), but
// then the offset will be zeroed out, since that was manually added
// https://github.com/akrennmair/newsbeuter/issues/369
stm.tm_isdst = -1;
const time_t local_time = mktime(&stm);
if (local_time == -1) {
return "";
}
const time_t gmttime = local_time + offs;
return newsboat::utils::mt_strf_localtime("%a, %d %b %Y %H:%M:%S +0000",
gmttime);
}
} // namespace rsspp
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