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authorManuel Novoa III <mjn3@codepoet.org>2003-11-02 07:39:27 +0000
committerManuel Novoa III <mjn3@codepoet.org>2003-11-02 07:39:27 +0000
commita30a999bb02478243fe4c0b3d012596c5398dfdd (patch)
tree7ed8a27492588c82bef1e74c993de2751e405974 /libc/misc/time/time.c
parentd8fe0f7534a6b52549992238c061e4e7a5b319ab (diff)
Hopefully fix the struct tm extension problem once and for all.
Also fix a dst-related bug which caused the use of uninitialized data.
Diffstat (limited to 'libc/misc/time/time.c')
-rw-r--r--libc/misc/time/time.c87
1 files changed, 65 insertions, 22 deletions
diff --git a/libc/misc/time/time.c b/libc/misc/time/time.c
index e2dadc211..5bda87039 100644
--- a/libc/misc/time/time.c
+++ b/libc/misc/time/time.c
@@ -97,8 +97,8 @@
* Bug reported by Arne Bernin <arne@alamut.de> in regards to freeswan.
*
* July 27, 2003 Adjust the struct tm extension field support.
- * Change __tm_tzone back to a ptr and add the __tm_tzname[] buffer for
- * __tm_tzone to point to. This gets around complaints from g++.
+ * Change __tm_zone back to a ptr and add the __tm_tzname[] buffer for
+ * __tm_zone to point to. This gets around complaints from g++.
* Who knows... it might even fix the PPC timezone init problem.
*
* July 29, 2003 Fix a bug in mktime behavior when tm_isdst was -1.
@@ -119,6 +119,13 @@
* unambiguous (not falling in the dst<->st transition region) both
* uClibc and glibc should produce the same result for mktime.
*
+ * Oct 31, 2003 Kill the seperate __tm_zone and __tm_tzname[] and which
+ * doesn't work if you want the memcpy the struct. Sigh... I didn't
+ * think about that. So now, when the extensions are enabled, we
+ * malloc space when necessary and keep the timezone names in a linked
+ * list.
+ *
+ * Fix a dst-related bug which resulted in use of uninitialized data.
*/
#define _GNU_SOURCE
@@ -512,6 +519,47 @@ struct tm *localtime(const time_t *timer)
/**********************************************************************/
#ifdef L_localtime_r
+#ifdef __UCLIBC_HAS_TM_EXTENSIONS__
+
+struct ll_tzname_item;
+
+typedef struct ll_tzname_item {
+ struct ll_tzname_item *next;
+ char tzname[TZNAME_MAX+1];
+} ll_tzname_item_t;
+
+static ll_tzname_item_t ll_tzname[] = {
+ { ll_tzname + 1, "UTC" }, /* Always 1st. */
+ { NULL, "???" } /* Always 2nd. (invalid or out-of-memory) */
+};
+
+const char *lookup_tzname(const char *key)
+{
+ ll_tzname_item_t *p;
+
+ for (p=ll_tzname ; p ; p=p->next) {
+ if (!strcmp(p->tzname, key)) {
+ return p->tzname;
+ }
+ }
+
+ /* Hmm... a new name. */
+ if (strnlen(key, TZNAME_MAX+1) < TZNAME_MAX+1) { /* Verify legal length */
+ if ((p = malloc(sizeof(ll_tzname_item_t))) != NULL) {
+ /* Insert as 3rd item in the list. */
+ p->next = ll_tzname[1].next;
+ ll_tzname[1].next = p;
+ strcpy(p->tzname, key);
+ return p->tzname;
+ }
+ }
+
+ /* Either invalid or couldn't alloc. */
+ return ll_tzname[1].tzname;
+}
+
+#endif /* __UCLIBC_HAS_TM_EXTENSIONS__ */
+
static const unsigned char day_cor[] = { /* non-leap */
31, 31, 34, 34, 35, 35, 36, 36, 36, 37, 37, 38, 38
/* 0, 0, 3, 3, 4, 4, 5, 5, 5, 6, 6, 7, 7 */
@@ -618,10 +666,9 @@ struct tm *localtime_r(register const time_t *__restrict timer,
result->tm_isdst = dst;
#ifdef __UCLIBC_HAS_TM_EXTENSIONS__
result->tm_gmtoff = - _time_tzinfo[dst].gmt_offset;
- result->tm_zone = result->__tm_tzname;
- strcpy(result->__tm_tzname, _time_tzinfo[dst].tzname);
+ result->tm_zone = lookup_tzname(_time_tzinfo[dst].tzname);
#endif /* __UCLIBC_HAS_TM_EXTENSIONS__ */
- } while ((++dst < 2) && (result->tm_isdst = tm_isdst(result)) != 0);
+ } while ((++dst < 2) && ((result->tm_isdst = tm_isdst(result)) != 0));
TZUNLOCK;
@@ -1698,13 +1745,8 @@ void tzset(void)
#ifdef __UCLIBC_HAS_TZ_CACHING__
*oldval = 0; /* Set oldval to an empty string. */
#endif /* __UCLIBC_HAS_TZ_CACHING__ */
- _time_tzinfo[0].gmt_offset = 0L;
- s = _time_tzinfo[0].tzname;
- *s = 'U';
- *++s = 'T';
- *++s = 'C';
- *++s =
- *_time_tzinfo[1].tzname = 0;
+ memset(_time_tzinfo, 0, 2*sizeof(rule_struct));
+ strcpy(_time_tzinfo[0].tzname, UTC);
goto DONE;
}
@@ -1774,6 +1816,7 @@ void tzset(void)
new_rules[count].gmt_offset = off;
if (!count) {
+ new_rules[1].gmt_offset = off; /* Shouldn't be needed... */
if (*e) {
++count;
goto LOOP;
@@ -1889,6 +1932,10 @@ static const unsigned char days[] = {
29,
};
+#ifdef __UCLIBC_HAS_TM_EXTENSIONS__
+static const char utc_string[] = "UTC";
+#endif
+
/* Notes:
* If time_t is 32 bits, then no overflow is possible.
* It time_t is > 32 bits, this needs to be adjusted to deal with overflow.
@@ -2018,14 +2065,7 @@ struct tm *_time_t2tm(const time_t *__restrict timer,
p[4] = 0; /* result[8] .. tm_isdst */
#ifdef __UCLIBC_HAS_TM_EXTENSIONS__
result->tm_gmtoff = 0;
- result->tm_zone = result->__tm_tzname;
- {
- register char *s = result->__tm_tzname;
- *s = 'U';
- *++s = 'T';
- *++s = 'C';
- *++s = 0;
- }
+ result->tm_zone = utc_string;
#endif /* __UCLIBC_HAS_TM_EXTENSIONS__ */
return result;
@@ -2064,8 +2104,11 @@ time_t _time_mktime(struct tm *timeptr, int store_on_success)
memcpy(p, timeptr, sizeof(struct tm));
- if ((default_dst = p[8]) < 0) {
- default_dst = 1; /* Assume advancing */
+ if ((default_dst = p[8]) < 0) { /* Try to determing if dst? */
+ default_dst = 1; /* Assume advancing. */
+ if (!_time_tzinfo[1].tzname[0]) { /* Oops... no dst. */
+ default_dst = p[8] = 0;
+ }
}
d = 400;