msvcrt: Change the way how localtime/gmtime buffer is stored in __thread_data.

dlls/msvcrt/main.c

@@ -73,6 +73,7 @@ static inline void msvcrt_free_tls_mem(void)
     HeapFree(GetProcessHeap(),0,tls->wasctime_buffer);
     HeapFree(GetProcessHeap(),0,tls->strerror_buffer);
     HeapFree(GetProcessHeap(),0,tls->wcserror_buffer);
+    HeapFree(GetProcessHeap(),0,tls->time_buffer);
     free_locinfo(tls->locinfo);
     free_mbcinfo(tls->mbcinfo);
   }

dlls/msvcrt/msvcrt.h

@@ -172,7 +172,7 @@ struct __thread_data {
     void                           *unk2[4];
     char                           *asctime_buffer;     /* buffer for asctime */
     MSVCRT_wchar_t                 *wasctime_buffer;    /* buffer for wasctime */
-    struct MSVCRT_tm                time_buffer;        /* buffer for localtime/gmtime */
+    struct MSVCRT_tm               *time_buffer;        /* buffer for localtime/gmtime */
     char                           *efcvt_buffer;       /* buffer for ecvt/fcvt */
     int                             unk3[2];
     void                           *unk4[4];

dlls/msvcrt/time.c

@@ -212,10 +212,13 @@ struct MSVCRT_tm* CDECL MSVCRT__localtime64(const MSVCRT___time64_t* secs)
     }
 
     data = msvcrt_get_thread_data();
-    unix_tm_to_msvcrt( &data->time_buffer, tm );
+    if(!data->time_buffer)
+        data->time_buffer = MSVCRT_malloc(sizeof(struct MSVCRT_tm));
+
+    unix_tm_to_msvcrt( data->time_buffer, tm );
     _munlock(_TIME_LOCK);
 
-    return &data->time_buffer;
+    return data->time_buffer;
 }
 
 /*********************************************************************
@@ -344,9 +347,12 @@ struct MSVCRT_tm* CDECL MSVCRT__gmtime64(const MSVCRT___time64_t *secs)
 {
     thread_data_t * const data = msvcrt_get_thread_data();
 
-    if(MSVCRT__gmtime64_s(&data->time_buffer, secs))
+    if(!data->time_buffer)
+        data->time_buffer = MSVCRT_malloc(sizeof(struct MSVCRT_tm));
+
+    if(MSVCRT__gmtime64_s(data->time_buffer, secs))
         return NULL;
-    return &data->time_buffer;
+    return data->time_buffer;
 }
 
 /*********************************************************************