netCDF: don't decode timevalue if timeunits is missing.

ChangeLog

-2019-05-23  Uwe Schulzweida
+2019-06-11  Uwe Schulzweida
 
         * using CGRIBEX library version 1.9.3
 	* Version 1.9.7 released
 
+2019-05-26  Uwe Schulzweida
+
+	* netCDF: don't decode timevalue if timeunits is missing
+
 2019-05-17  Uwe Schulzweida
 
 	* vlistInqVarLongname: return CDI_MAX_NAME chars (bug fix)

src/basetime.c

@@ -14,6 +14,7 @@ void basetimeInit(basetime_t *basetime)
       basetime->ncdimid       = CDI_UNDEFID;
       basetime->ncvarboundsid = CDI_UNDEFID;
       basetime->leadtimeid    = CDI_UNDEFID;
+      basetime->lunits        = false;
       basetime->lwrf          = false;
       basetime->timevar_cache = NULL;
     }

src/basetime.h

@@ -19,6 +19,7 @@ typedef struct {
   int   ncdimid;
   int   ncvarboundsid;
   int   leadtimeid;
+  bool  lunits;
   bool  lwrf;     // true for time axis in WRF format
   timecache_t *timevar_cache;
 }

src/stream_cdf_i.c

@@ -3992,6 +3992,7 @@ int cdfInqContents(stream_t *streamptr)
   int nctimevarid = streamptr->basetime.ncvarid;
 
   if (nctimevarid != CDI_UNDEFID && (!time_has_units || streamptr->basetime.lwrf)) ncvars[nctimevarid].units[0] = 0;
+  if (nctimevarid != CDI_UNDEFID && time_has_units) streamptr->basetime.lunits = true;
 
   if ( time_has_units )
     {
@@ -4001,6 +4002,7 @@ int cdfInqContents(stream_t *streamptr)
         {
           nctimevarid = CDI_UNDEFID;
           streamptr->basetime.ncvarid = CDI_UNDEFID;
+          streamptr->basetime.lunits = false;
         }
 
       if ( leadtime_id != CDI_UNDEFID && taxis->type == TAXIS_RELATIVE )
@@ -4179,7 +4181,7 @@ int cdfInqTimestep(stream_t * streamptr, int tsID)
       double timevalue = tsID;
 
       int nctimevarid = streamptr->basetime.ncvarid;
-      if ( nctimevarid != CDI_UNDEFID )
+      if (nctimevarid != CDI_UNDEFID && streamptr->basetime.lunits)
 	{
 	  int fileID = streamptr->fileID;
 	  size_t index = (size_t)tsID;