changes

src/g2cfile.c

@@ -1116,8 +1116,8 @@ read_metadata(int g2cid)
         LOG((6, "file_pos %ld", file_pos));
     }
 
-    /* If we run out of messages, that's success. */
-    if (ret == G2C_ENOMSG)
+    /* If we read some messages, then run out, that's success. */
+    if (ret == G2C_ENOMSG && msg_num)
         ret = G2C_NOERROR;
 
 #ifdef LOGGING

tests/run_index_tests.sh

@@ -9,9 +9,12 @@ set -e
 echo ""
 echo "*** Running g2c_index test"
 
-# Read GRIB1 index.
+# Create an index for a GRIB2 file.
 ../utils/g2c_index -v data/gdaswave.t00z.wcoast.0p16.f000.grib2 gdaswave.t00z.wcoast.0p16.f000.grib2.idx
 
+# Summarize the index data.
+../utils/g2c_degrib2 -v gdaswave.t00z.wcoast.0p16.f000.grib2.idx gdaswave.t00z.wcoast.0p16.f000.grib2.idx.degrib2
+
 # Check against expected output.
 #diff -w g2c_degrib2_gdaswave.t00z.wcoast.0p16.f000.grib2.degrib2 data/ref_gdaswave.degrib2.txt
 

utils/g2c_degrib2.c

@@ -62,6 +62,13 @@ main(int argc, char **argv)
             break;
     }
 
+    /* If we didn't get 2 files, error. */
+    if (p != 2)
+    {
+	printf("Two filenames must be provided, for input and output.\n");
+	return G2C_ERROR;
+    }
+
     /* Yammer on and on. */
     if (verbose)
         printf("g2c_degrib2 %s summarizing %s into %s.\n", G2C_VERSION, path[0], path[1]);