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options/ansi: Implement gmtime() and gmtime_r()

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This commit is contained in:
Alexander van der Grinten 2019-04-01 19:12:36 +02:00
parent 72152b74e4
commit 0a7b9b244f
1 changed files with 52 additions and 27 deletions
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79
options/ansi/generic/time-stubs.cpp
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@ -39,19 +39,17 @@ char *ctime(const time_t *timer){
__ensure(!"Not implemented");
__builtin_unreachable();
}
struct tm *gmtime(const time_t *timer) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
struct tm *gmtime_r(const time_t *__restrict timer,
struct tm *__restrict result) {
__ensure(!"Not implemented");
__builtin_unreachable();
}
struct tm *localtime(const time_t *t) {
struct tm *gmtime(const time_t *unix_gmt) {
static thread_local struct tm per_thread_tm;
return localtime_r(t, &per_thread_tm);
return gmtime_r(unix_gmt, &per_thread_tm);
}
struct tm *localtime(const time_t *unix_gmt) {
static thread_local struct tm per_thread_tm;
return localtime_r(unix_gmt, &per_thread_tm);
}
size_t strftime(char *__restrict dest, size_t max_size,
const char *__restrict format, const struct tm *__restrict tm) {
auto c = format;
@ -297,7 +295,7 @@ struct[[gnu::packed]] ttinfo {
// Looks up the local time rules for a given
// UNIX GMT timestamp (seconds since 1970 GMT, ignoring leap seconds).
int unix_local_from_gmt(time_t gmt_time, time_t *offset, bool *dst) {
int unix_local_from_gmt(time_t unix_gmt, time_t *offset, bool *dst) {
static file_window window{"/etc/localtime"};
tzfile tzfile_time;
@ -327,7 +325,7 @@ int unix_local_from_gmt(time_t gmt_time, time_t *offset, bool *dst) {
memcpy(&ttime, reinterpret_cast<char *>(window.get()) + sizeof(tzfile)
+ i * sizeof(int32_t), sizeof(int32_t));
ttime = bswap_32(ttime);
if(ttime > gmt_time) {
if(ttime > unix_gmt) {
__ensure(i);
index = i - 1;
break;
@ -354,7 +352,34 @@ int unix_local_from_gmt(time_t gmt_time, time_t *offset, bool *dst) {
} //anonymous namespace
struct tm *localtime_r(const time_t *gmt_time, struct tm *tm) {
struct tm *gmtime_r(const time_t *unix_gmt, struct tm *res) {
int year;
unsigned int month;
unsigned int day;
unsigned int weekday;
unsigned int yday;
time_t unix_local = *unix_gmt;
int days_since_epoch = unix_local / (60*60*24);
civil_from_days(days_since_epoch, &year, &month, &day);
weekday_from_days(days_since_epoch, &weekday);
yearday_from_date(year, month, day, &yday);
res->tm_sec = unix_local % 60;
res->tm_min = (unix_local / 60) % 60;
res->tm_hour = (unix_local / (60*60)) % 24;
res->tm_mday = day;
res->tm_mon = month - 1;
res->tm_year = year - 1900;
res->tm_wday = weekday;
res->tm_yday = yday - 1;
res->tm_isdst = -1;
return res;
}
struct tm *localtime_r(const time_t *unix_gmt, struct tm *res) {
int year;
unsigned int month;
unsigned int day;
@ -364,25 +389,25 @@ struct tm *localtime_r(const time_t *gmt_time, struct tm *tm) {
time_t offset = 0;
bool dst;
// TODO: Set errno if the conversion fails.
if(unix_local_from_gmt(*gmt_time, &offset, &dst))
if(unix_local_from_gmt(*unix_gmt, &offset, &dst))
__ensure(!"Error parsing /etc/localtime");
time_t tz_time = *gmt_time + offset;
time_t unix_local = *unix_gmt + offset;
int days_since_epoch = tz_time / (60*60*24);
int days_since_epoch = unix_local / (60*60*24);
civil_from_days(days_since_epoch, &year, &month, &day);
weekday_from_days(days_since_epoch, &weekday);
yearday_from_date(year, month, day, &yday);
tm->tm_sec = tz_time % 60;
tm->tm_min = (tz_time / 60) % 60;
tm->tm_hour = (tz_time / (60*60)) % 24;
tm->tm_mday = day;
tm->tm_mon = month - 1;
tm->tm_year = year - 1900;
tm->tm_wday = weekday;
tm->tm_yday = yday - 1;
tm->tm_isdst = -1;
res->tm_sec = unix_local % 60;
res->tm_min = (unix_local / 60) % 60;
res->tm_hour = (unix_local / (60*60)) % 24;
res->tm_mday = day;
res->tm_mon = month - 1;
res->tm_year = year - 1900;
res->tm_wday = weekday;
res->tm_yday = yday - 1;
res->tm_isdst = -1;
return tm;
return res;
}