libc: Fix mktime returns an uncorrect time in empty TZ case
The mktime API returned an uncorrect time when TZ is set as empty.
A timezone UTC/GMT+0 should be implied in the empty case. However
mktime keeps previous information about timezone. If mktime was called
with a timezone which has DST before, the "defaulttype" member of
"state" structure wouldn't be 0. Then it would be used next time,
even though UTC/GMT+0 doesn't have DST.
Added initialization of the "defaulttype" in the empty TZ case.
Change-Id: Ic480c63c548c05444134e0aefb30a7b380e3f40b
diff --git a/libc/tzcode/localtime.c b/libc/tzcode/localtime.c
index 28d13f4..29f605c 100644
--- a/libc/tzcode/localtime.c
+++ b/libc/tzcode/localtime.c
@@ -1257,6 +1257,7 @@
lclptr->ttis[0].tt_gmtoff = 0;
lclptr->ttis[0].tt_abbrind = 0;
(void) strcpy(lclptr->chars, gmt);
+ lclptr->defaulttype = 0;
} else if (tzload(name, lclptr, TRUE) != 0)
if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0)
(void) gmtload(lclptr);