Whitespace changes only: Remove trailing whitespace

[pspp] / src / math / interaction.c

diff --git a/src/math/interaction.c b/src/math/interaction.c
index 706092476ec2b3bb8f3f391de37338ffe2ccdbed..ee5b2bf034e1c407d386b4792baaaeb9ad01cd0f 100644 (file)
--- a/src/math/interaction.c
+++ b/src/math/interaction.c
@@ -34,10 +34,10 @@
 
   Interaction is commutative.  That means, that from a mathematical point of
   view,  the order of the variables is irrelevant.  However, for display
-  purposes, and for matching with an interaction's value the order is 
+  purposes, and for matching with an interaction's value the order is
   pertinent.
-  
-  Therefore, when using these functions, make sure the orders of variables 
+
+  Therefore, when using these functions, make sure the orders of variables
   and values match when appropriate.
 */
 
@@ -106,7 +106,7 @@ interaction_is_proper_subset (const struct interaction *x, const struct interact
 }
 
 /*
-  Do the variables in X->VARS constitute a 
+  Do the variables in X->VARS constitute a
   subset (proper or otherwise) of the variables in Y->VARS?
  */
 bool
@@ -132,7 +132,7 @@ interaction_is_subset (const struct interaction *x, const struct interaction *y)
        }
     }
 
-  /* If ALL the members of X were also found in Y, then this must be a subset */    
+  /* If ALL the members of X were also found in Y, then this must be a subset */
   if (n >= x->n_vars)
     return true;
 
@@ -146,11 +146,14 @@ void
 interaction_dump (const struct interaction *i)
 {
   int v = 0;
-  printf ("%s", var_get_name (i->vars[v]));
-  for (v = 1; v < i->n_vars; ++v)
+  if ( i->n_vars == 0)
     {
-      printf (" * %s", var_get_name (i->vars[v]));
+      printf ("(empty)\n");
+      return;
     }
+  printf ("%s", var_get_name (i->vars[v]));
+  for (v = 1; v < i->n_vars; ++v)
+    printf (" * %s", var_get_name (i->vars[v]));
   printf ("\n");
 }