added Option -H to do not append to netCDF history global attribute

ChangeLog

@@ -3,6 +3,10 @@
 	* using CDI library version 1.6.4
 	* Version 1.6.4 released
 
+2014-03-10  Uwe Schulzweida
+
+	* added Option -H to do not append to netCDF "history" global attribute
+
 2014-03-03  Uwe Schulzweida
 
 	* Zonstat: bug fix if input stream contains only zonal data

NEWS

 CDO NEWS
 --------
 
+Version 1.6.4 (20 May 2014):
+
+   New features:
+     * Option -H: Do not append to netCDF "history" global attribute
+
 Version 1.6.3 (18 February 2014):
 
    New features:

src/cdo.c

@@ -87,6 +87,7 @@ int cdoCheckDatarange    = FALSE;
 
 int cdoColor             = FALSE;
 int cdoDiag              = FALSE;
+int cdoAppendHistory     = TRUE;
 int cdoDisableHistory    = FALSE;
 int cdoCompType          = COMPRESS_NONE;  // compression type
 int cdoCompLevel         = 0;              // compression level
@@ -201,6 +202,7 @@ void cdo_usage(void)
   fprintf(stderr, "    -g <grid>      Set default grid name or file. Available grids: \n");
   fprintf(stderr, "                   n<N>, t<RES>, tl<RES>, global_<DXY>, r<NX>x<NY>, g<NX>x<NY>, gme<NI>, lon=<LON>/lat=<LAT>\n");
   fprintf(stderr, "    -h             Help information for the operators\n");
+  fprintf(stderr, "    -H             Do not append to netCDF \"history\" global attribute\n");
   /*
   fprintf(stderr, "    -i <inst>      Institution name/file\n");
   fprintf(stderr, "                   Predefined instituts: ");
@@ -1085,7 +1087,7 @@ void parse_options(int argc, char *argv[])
 {
   int c;
 
-  while ( (c = cdoGetopt(argc, argv, "f:b:e:P:p:g:i:k:l:m:n:t:D:z:aBCcdhLMOQRrsSTuVvWXZ")) != -1 )
+  while ( (c = cdoGetopt(argc, argv, "f:b:e:P:p:g:i:k:l:m:n:t:D:z:aBCcdhHLMOQRrsSTuVvWXZ")) != -1 )
     {
       switch (c)
 	{
@@ -1137,6 +1139,9 @@ void parse_options(int argc, char *argv[])
 	case 'h':	
 	  Help = 1;
 	  break;
+	case 'H':	
+	  cdoAppendHistory = FALSE;
+	  break;
 	case 'i':
 	  defineInstitution(cdoOptarg);
 	  break;

src/history.c

@@ -77,29 +77,40 @@ void cdoInqHistory(int fileID)
 }
 
 
-void cdoDefHistory(int fileID, char *histstring)
+void cdoDefHistory(int fileID, char* histstring)
 {
-  char *history = NULL;
+  char* strtimeptr = NULL;
+  char* history = NULL;
   size_t historysize = 0;
-  char *strtimeptr;
+  extern int cdoAppendHistory;
   extern int cdoDisableHistory;
 
-  strtimeptr = get_strtimeptr();
-  
-  historysize = ghistorysize+strlen(strtimeptr)+strlen(histstring)+2;
-  history = malloc(historysize);
+  if ( !cdoDisableHistory ) historysize += ghistorysize;
+
+  if ( cdoAppendHistory )
+    {
+      strtimeptr = get_strtimeptr();
+      historysize += strlen(strtimeptr)+strlen(histstring)+2;
+    }
+
+  if ( historysize ) history = malloc(historysize);
 
-  strcpy(history, strtimeptr);
-  strcat(history, histstring);
+  if ( cdoAppendHistory )
+    {
+      strcpy(history, strtimeptr);
+      strcat(history, histstring);
+    }
 
-  if ( cdoDisableHistory == FALSE )
+  if ( !cdoDisableHistory )
     if ( ghistory )
       {
-	strcat(history, "\n");
+	if ( cdoAppendHistory ) strcat(history, "\n");
 	strcat(history, ghistory);
       }
-
-  streamDefHistory(fileID, strlen(history), history);
   
-  free(history);
+  if ( historysize )
+    {
+      streamDefHistory(fileID, strlen(history), history);
+      free(history);
+    }
 }