diff --git a/cf b/cf
index 1d123b52d..48edb83e3 100644
--- a/cf
+++ b/cf
@@ -1,6 +1,6 @@
 #!/bin/bash
 #NB=1
-#DB=1
+DB=1
 #X=-x
 
 #FAST=1
diff --git a/libdap2/daputil.c b/libdap2/daputil.c
index 97d47b0cf..db743078e 100644
--- a/libdap2/daputil.c
+++ b/libdap2/daputil.c
@@ -567,7 +567,8 @@ getlimitnumber(const char* limit)
     case 'K': case 'k': multiplier = KILOBYTE; break;
     default: break;
     }
-    sscanf(limit,"%lu",&lu);
+    if(sscanf(limit,"%lu",&lu) != 1)
+	return 0;
     return (lu*multiplier);
 }
 
diff --git a/libdap2/dceparse.c b/libdap2/dceparse.c
index b9588f9bd..c7572e757 100644
--- a/libdap2/dceparse.c
+++ b/libdap2/dceparse.c
@@ -128,14 +128,17 @@ range(DCEparsestate* state, Object sfirst, Object sstride, Object slast)
 
     /* Note: that incoming arguments are strings; we must convert to size_t;
        but we do know they are legal integers or NULL */
-    sscanf((char*)sfirst,"%lu",&first); /* always defined */
-    if(slast != NULL)
-        sscanf((char*)slast,"%lu",&last);
-    else
+    if(sscanf((char*)sfirst,"%lu",&first) != 1) /* always defined */
+	return NULL;
+    if(slast != NULL) {
+        if(sscanf((char*)slast,"%lu",&last) != 1)
+	    return NULL;
+    } else
 	last = first;
-    if(sstride != NULL)
-        sscanf((char*)sstride,"%lu",&stride);
-    else
+    if(sstride != NULL) {
+        if(sscanf((char*)sstride,"%lu",&stride) != 1)
+	    return NULL;
+    } else
 	stride = 1; /* default */
 
     if(stride == 0)
@@ -158,7 +161,8 @@ Object
 range1(DCEparsestate* state, Object rangenumber)
 {
     int range = -1;
-    sscanf((char*)rangenumber,"%u",&range);
+    if(sscanf((char*)rangenumber,"%u",&range) != 1)
+	range = -1;
     if(range < 0) {
     	dceerror(state,"Illegal range index");
     }
@@ -199,7 +203,8 @@ array_indices(DCEparsestate* state, Object list0, Object indexno)
     long long start = -1;
     NClist* list = (NClist*)list0;
     if(list == NULL) list = nclistnew();
-    sscanf((char*)indexno,"%lld",&start);
+    if(sscanf((char*)indexno,"%lld",&start) != 1)
+	start = -1;
     if(start < 0) {
     	dceerror(state,"Illegal array index");
 	start = 1;
diff --git a/libdispatch/nchashmap.c b/libdispatch/nchashmap.c
index 36c0af05e..169fabd86 100644
--- a/libdispatch/nchashmap.c
+++ b/libdispatch/nchashmap.c
@@ -2090,7 +2090,7 @@ printhashmap(NC_hashmap* hm)
 	NC_hentry e = hm->table[i];
 	if(e.flags == ACTIVE) {
 	    fprintf(stderr,"[%ld] flags=ACTIVE hashkey=%lu data=%p keysize=%u key=(%llu)|%s|\n",
-		(unsigned long)i,(unsigned long)e.hashkey,(void*)e.data,(unsigned)e.keysize,(unsigned long long)e.key,e.key);
+		(unsigned long)i,(unsigned long)e.hashkey,(void*)e.data,(unsigned)e.keysize,(unsigned long long)(uintptr_t)e.key,e.key);
 	    running = 0;
 	} else if(e.flags == DELETED) {
 	    fprintf(stderr,"[%ld] flags=DELETED hashkey=%lu\n",
diff --git a/libhdf5/hdf5file.c b/libhdf5/hdf5file.c
index 870560685..b68934150 100644
--- a/libhdf5/hdf5file.c
+++ b/libhdf5/hdf5file.c
@@ -226,7 +226,9 @@ nc4_close_netcdf4_file(NC_FILE_INFO_T *h5, int abort, int extractmem)
 exit:
    /* Free the nc4_info struct; above code should have reclaimed
       everything else */
+
    if (!retval)
+
       free(h5);
    return retval;
 }
diff --git a/nc_test4/tst_filter.sh b/nc_test4/tst_filter.sh
index 6e2201dc9..36df9dbde 100755
--- a/nc_test4/tst_filter.sh
+++ b/nc_test4/tst_filter.sh
@@ -101,7 +101,7 @@ echo "*** Testing dynamic filters using nccopy"
 rm -f ./unfiltered.nc ./filtered.nc ./tmp.nc ./filtered.dump ./tst_filter.txt
 ${NCGEN} -4 -lb -o unfiltered.nc ${srcdir}/unfiltered.cdl
 echo "	*** Testing simple filter application"
-${NCCOPY} -F "/g/var,307,9,4" unfiltered.nc filtered.nc
+${NCCOPY} -M0 -F "/g/var,307,9,4" unfiltered.nc filtered.nc
 ${NCDUMP} -s filtered.nc > ./tst_filter.txt
 # Remove irrelevant -s output
 sclean ./tst_filter.txt ./filtered.dump
@@ -119,7 +119,7 @@ echo "	*** Pass: pass-thru of filters"
 
 echo "	*** Testing -F none"
 rm -f ./tst_filter.txt ./tst_filter2.txt ./tst_filter.nc
-${NCCOPY} -F none ./filtered.nc ./tst_filter.nc
+${NCCOPY} -M0 -F none ./filtered.nc ./tst_filter.nc
 ${NCDUMP} -s tst_filter.nc > ./tst_filter.txt
 sed -e '/_Filter/p' -e d < ./tst_filter.txt >./tst_filter2.txt
 test ! -s tst_filter2.txt
@@ -127,7 +127,7 @@ echo "	*** Pass: -F none"
 
 echo "	*** Testing -F var,none "
 rm -f ./tst_filter.txt ./tst_filter.nc
-${NCCOPY} -F "/g/var,none" ./filtered.nc ./tst_filter.nc
+${NCCOPY} -M0 -F "/g/var,none" ./filtered.nc ./tst_filter.nc
 ${NCDUMP} -s tst_filter.nc > ./tst_filter.txt
 sed -e '/_Filter/p' -e d < ./tst_filter.txt >tst_filter2.txt
 test ! -s tst_filter2.txt
diff --git a/ncdump/nccopy.c b/ncdump/nccopy.c
index 914da437b..ec9e0d9d3 100644
--- a/ncdump/nccopy.c
+++ b/ncdump/nccopy.c
@@ -2133,6 +2133,8 @@ main(int argc, char**argv)
             if(level >= 0)
               nc_set_log_level(level);
             }
+#else
+	    error("-L specified, but logging support not enabled");
 #endif
             break;
 	case 'F': /* optional filter spec for a specified variable */
@@ -2154,9 +2156,13 @@ main(int argc, char**argv)
 #else
 	    error("-F requires netcdf-4");
 #endif
+	    break;
 	case 'M': /* set min chunk size */
 #ifdef USE_NETCDF4
-	    option_min_chunk_bytes = atol(optarg);
+	    if(optarg == NULL)
+		option_min_chunk_bytes = -1;
+	    else
+	        option_min_chunk_bytes = atol(optarg);
 	    if(option_min_chunk_bytes < 0)
 		error("-M value must be non-negative integer");
 	    break;
diff --git a/ncdump/ocprint.c b/ncdump/ocprint.c
index f2ffdb88a..215ef4329 100644
--- a/ncdump/ocprint.c
+++ b/ncdump/ocprint.c
@@ -217,7 +217,7 @@ main(int argc, char **argv)
 	    break;
         case 'D': {
 	    int c0;
-	    if(strlen(optarg) == 0) usage("missing -D argument");
+	    if(optarg == NULL || strlen(optarg) == 0) usage("missing -D argument");
 	    c0 = optarg[0];
 	    if(c0 >= '0' && c0 <= '9') {/* debug level */
 		ocopt.debug.debuglevel = atoi(optarg); break;
@@ -245,6 +245,8 @@ main(int argc, char **argv)
 
 	case 'o':
             if(ocopt.output != NULL) fclose(ocopt.output);
+	    if(optarg == NULL)
+		usage("-o does not specify a file name");
 	    ocopt.output = fopen(optarg,"w");
             if(ocopt.output == NULL)
 		usage("-o file not writeable");
@@ -255,6 +257,8 @@ main(int argc, char **argv)
 	    break;
 
 	case 'p':
+	    if(optarg == NULL)
+		usage("-p does not specify an argument");
 	    if(strcasecmp(optarg,"das")==0) ocopt.optdas=1;
 	    else if(strcasecmp(optarg,"dds")==0) ocopt.optdds=1;
 	    else if(strcasecmp(optarg,"data")==0) ocopt.optdatadds=1;
@@ -280,7 +284,8 @@ main(int argc, char **argv)
     if(ocopt.logging) {
 	ncloginit();
 	ncsetlogging(1);
-	nclogopen(NULL);
+	if(!nclogopen(NULL))
+	    fprintf(stderr,"Failed to open logging output\n");
     }
 
     argc -= optind;
@@ -479,10 +484,7 @@ processdata(OCflags flags)
     if(ocopt.optdatadds) {
         ocstat = oc_fetch(link,ocopt.url->query,OCDATADDS,flags,&dataddsroot);
         if(ocstat) {
-            if(ocopt.url->query)
-                fprintf(stderr,"Cannot read DATADDS: %s\n",ocopt.surl);
-            else
-                fprintf(stderr,"Cannot read DATADDS: %s\n",ocopt.surl);
+            fprintf(stderr,"Cannot read DATADDS: %s\n",ocopt.surl);
             exit(1);
         }
         if(ocopt.debug.dumpdds)
@@ -556,8 +558,8 @@ printdata_container(OClink link, OCdatanode datanode, NCbytes* buffer, int istop
 	pushstack(field);
         FAIL(printdata_indices(link,field,buffer,istoplevel));
 	popstack();
-	oc_data_free(link,field);
-	if(stat != OC_NOERR) break;
+	if(oc_data_free(link,field) != OC_NOERR)
+	    break;
     }
     return stat;
 }
@@ -997,7 +999,7 @@ dumpdatanode(OClink link, OCdatanode datanode, size_t count, void* memory, NCbyt
     OCtype atomtype;
     OCtype octype;
     NCbytes* path = NULL;
-    char* name;
+    char* name = NULL;
     char id[1024];
     char tmp[1024];
     struct DUMPPATH* entry = NULL;
diff --git a/oc2/dapparse.c b/oc2/dapparse.c
index b7d479f63..c77579bf9 100644
--- a/oc2/dapparse.c
+++ b/oc2/dapparse.c
@@ -103,7 +103,7 @@ dap_unrecognizedresponse(DAPparsestate* state)
     unsigned int httperr = 0;
     int i;
     char iv[32];
-    sscanf(state->lexstate->input,"%u ",&httperr);
+    (void)sscanf(state->lexstate->input,"%u ",&httperr);
     sprintf(iv,"%u",httperr);
     state->lexstate->next = state->lexstate->input;
     /* Limit the amount of input to prevent runaway */