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Diffstat (limited to 'time/tzfile.c')
-rw-r--r--time/tzfile.c63
1 files changed, 54 insertions, 9 deletions
diff --git a/time/tzfile.c b/time/tzfile.c
index 7c72aad..1bce14c 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -16,11 +16,12 @@
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-#include <stdlib.h>
+#include <assert.h>
+#include <limits.h>
#include <stdio.h>
-#include <time.h>
+#include <stdlib.h>
#include <string.h>
-#include <limits.h>
+#include <time.h>
#include <unistd.h>
#define NOID
@@ -172,7 +173,7 @@ __tzfile_read (const char *file)
if (num_transitions > 0)
{
- transitions = (time_t *) malloc (num_transitions * sizeof(time_t));
+ transitions = (time_t *) malloc (num_transitions * sizeof (time_t));
if (transitions == NULL)
goto lose;
type_idxs = (unsigned char *) malloc (num_transitions);
@@ -219,7 +220,7 @@ __tzfile_read (const char *file)
processed when sizeof (time_t) > 4. */
i = num_transitions;
while (i-- > 0)
- transitions[i] = decode ((char *) transitions + i*4);
+ transitions[i] = decode ((char *) transitions + i * 4);
}
for (i = 0; i < num_types; ++i)
@@ -270,12 +271,36 @@ __tzfile_read (const char *file)
fclose (f);
+ /* First "register" all timezone names. */
+ for (i = 0; i < num_types; ++i)
+ (void) __tzstring (&zone_names[types[i].idx]);
+
/* Find the standard and daylight time offsets used by the rule file.
We choose the offsets in the types of each flavor that are
transitioned to earliest in time. */
+ __tzname[0] = NULL;
__tzname[1] = NULL;
- for (i = 0; i < num_types; ++i)
- __tzname[types[i].isdst] = __tzstring (&zone_names[types[i].idx]);
+ for (i = num_transitions; i > 0; )
+ {
+ int type = type_idxs[--i];
+ int dst = types[type].isdst;
+ int idx = types[type].idx;
+
+ if (__tzname[dst] == NULL)
+ {
+ __tzname[dst] = __tzstring (&zone_names[idx]);
+
+ if (__tzname[1 - dst] != NULL)
+ break;
+ }
+ }
+ if (__tzname[0] == NULL)
+ {
+ /* This should only happen if there are no transition rules.
+ In this case there should be only one single type. */
+ assert (num_types == 1);
+ __tzname[0] = __tzstring (zone_names);
+ }
if (__tzname[1] == NULL)
__tzname[1] = __tzname[0];
@@ -438,9 +463,29 @@ __tzfile_compute (time_t timer, int use_localtime,
struct ttinfo *info = find_transition (timer);
__daylight = rule_stdoff != rule_dstoff;
__timezone = -rule_stdoff;
+ __tzname[0] = NULL;
__tzname[1] = NULL;
- for (i = 0; i < num_types; ++i)
- __tzname[types[i].isdst] = __tzstring (&zone_names[types[i].idx]);
+ for (i = num_transitions; i > 0; )
+ {
+ int type = type_idxs[--i];
+ int dst = types[type].isdst;
+ int idx = types[type].idx;
+
+ if (__tzname[dst] == NULL)
+ {
+ __tzname[dst] = __tzstring (&zone_names[idx]);
+
+ if (__tzname[1 - dst] != NULL)
+ break;
+ }
+ }
+ if (__tzname[0] == NULL)
+ {
+ /* This should only happen if there are no transition rules.
+ In this case there should be only one single type. */
+ assert (num_types == 1);
+ __tzname[0] = __tzstring (zone_names);
+ }
if (__tzname[1] == NULL)
/* There is no daylight saving time. */
__tzname[1] = __tzname[0];