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-rw-r--r--libc/misc/time/time.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/libc/misc/time/time.c b/libc/misc/time/time.c
index 5cef91787..f43bb8a3c 100644
--- a/libc/misc/time/time.c
+++ b/libc/misc/time/time.c
@@ -118,6 +118,15 @@
* Make lookup_tzname() static (as it should have been).
* Have strftime() get timezone information from the passed struct
* for the %z and %Z conversions when using struct tm extensions.
+ *
+ * Jul 24, 2004
+ * Fix 2 bugs in strftime related to glibc struct tm extensions.
+ * 1) Need to negate tm_gmtoff field value when used. (bug 336).
+ * 2) Deal with NULL ptr case for tm_zone field, which was causing
+ * segfaults in both the NIST/PCTS tests and the Python 2.4.1
+ * self-test suite.
+ * NOTE: We set uninitialized timezone names to "???", and this
+ * differs (intentionally) from glibc's behavior.
*/
#define _GNU_SOURCE
@@ -1066,7 +1075,7 @@ size_t __XL(strftime)(char *__restrict s, size_t maxsize,
#define RSP_TZUNLOCK ((void) 0)
#define RSP_TZNAME timeptr->tm_zone
-#define RSP_GMT_OFFSET timeptr->tm_gmtoff
+#define RSP_GMT_OFFSET (-timeptr->tm_gmtoff)
#else
@@ -1084,6 +1093,20 @@ size_t __XL(strftime)(char *__restrict s, size_t maxsize,
if (*p == 'Z') {
o = RSP_TZNAME;
+#ifdef __UCLIBC_HAS_TM_EXTENSIONS__
+ /* Sigh... blasted glibc extensions. Of course we can't
+ * count on the pointer being valid. Best we can do is
+ * handle NULL, which looks to be all that glibc does.
+ * At least that catches the memset() with 0 case.
+ * NOTE: We handle this case differently than glibc!
+ * It uses system timezone name (based on tm_isdst) in this
+ * case... although it always seems to use the embedded
+ * tm_gmtoff value. What we'll do instead is treat the
+ * timezone name as unknown/invalid and return "???". */
+ if (!o) {
+ o = "???";
+ }
+#endif
assert(o != NULL);
#if 0
if (!o) { /* PARANOIA */