/* Use time zone TZ to compute mktime (TM). */
time_t
mktime_z (timezone_t tz, struct tm *tm)
{
if (!tz)
return timegm (tm);
else
{
timezone_t old_tz = set_tz (tz);
if (old_tz)
{
time_t t = mktime (tm);
#if HAVE_TM_ZONE || HAVE_TZNAME
time_t badtime = -1;
struct tm tm_1;
if ((t != badtime
|| (localtime_r (&t, &tm_1) && equal_tm (tm, &tm_1)))
&& !save_abbr (tz, tm))
t = badtime;
#endif
if (revert_tz (old_tz))
return t;
}
return -1;
}
}
/* Use time zone TZ to compute localtime_r (T, TM). */
struct tm *
localtime_rz (timezone_t tz, time_t const *t, struct tm *tm)
{
if (!tz)
return gmtime_r (t, tm);
else
{
timezone_t old_tz = set_tz (tz);
if (old_tz)
{
bool abbr_saved = localtime_r (t, tm) && save_abbr (tz, tm);
if (revert_tz (old_tz) && abbr_saved)
return tm;
}
return NULL;
}
}
/* Use time zone TZ to compute localtime_r (T, TM). */
struct tm *
localtime_rz (timezone_t tz, time_t const *t, struct tm *tm)
{
if (!tz)
return gmtime_r (t, tm);
else
{
timezone_t old_tz = set_tz (tz);
if (old_tz)
{
tm = localtime_r (t, tm);
if (tm && !save_abbr (tz, tm))
tm = NULL;
if (revert_tz (old_tz))
return tm;
}
return NULL;
}
}
