Initialize all fields of struct tm used by wxDateTime::Format().

Passing not fully initialized struct tm to strftime() results in Valgrind
errors and possible nastiness, see #12455.

Simply use memset() to set all fields of this system-dependent struct to 0
initially.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65494 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/common/datetimefmt.cpp b/src/common/datetimefmt.cpp
index bf920165252fc7c7bf71a74fd65a8664864c4288..7095fde8566ecbca67635ab2706f27d18ee5636f 100644 (file)
--- a/src/common/datetimefmt.cpp
+++ b/src/common/datetimefmt.cpp
@@ -374,12 +374,11 @@ wxString wxDateTime::Format(const wxString& formatp, const TimeZone& tz) const
 
     // used for calls to strftime() when we only deal with time
     struct tm tmTimeOnly;
+    memset(&tmTimeOnly, 0, sizeof(tmTimeOnly));
     tmTimeOnly.tm_hour = tm.hour;
     tmTimeOnly.tm_min = tm.min;
     tmTimeOnly.tm_sec = tm.sec;
-    tmTimeOnly.tm_wday = 0;
-    tmTimeOnly.tm_yday = 0;
-    tmTimeOnly.tm_mday = 1;         // any date will do
+    tmTimeOnly.tm_mday = 1;         // any date will do, use 1976-01-01
     tmTimeOnly.tm_mon = 0;
     tmTimeOnly.tm_year = 76;
     tmTimeOnly.tm_isdst = 0;        // no DST, we adjust for tz ourselves