Assignment about professionally Programming a library

Assignment1/diff.c

@@ -0,0 +1,48 @@
+#include <stdlib.h>
+
+/*Step 5 : */
+
+/*Return 0 if ds1 and ds2 are clones,
+ * else return -1*/
+int
+diff (void *root1,    /*pointer to Data structure 1*/
+      void *root2,    /*pointer to data structure 2*/
+      void *(*iterator(void *)), /*Iterator function callback*/
+      int comparator(void *, void *),
+      void *(*get_app_data(void *))){  /*Comparison function callback*/
+
+      /*Write your code here*/
+        
+      void *data1;
+      void *data2;
+
+      void *temp1 = root1 , *temp2 = root2;
+
+      if( !root1 && root2 )
+          return -1;
+      else if( root1 && !root2 )
+          return -1;
+
+      if( comparator(get_app_data(temp1),get_app_data(temp2)))
+          return -1;
+
+      while( temp1 != NULL && temp2 != NULL ){
+
+            data1 =get_app_data(temp1);
+            data2 = get_app_data(temp2);
+
+            if( comparator(data1,data2) == -1 ){
+                return -1;
+            }
+
+            temp1 = iterator(temp1);
+            temp2 = iterator(temp2);
+      }
+
+      if( temp1 == NULL && temp2 != NULL )
+          return -1;
+      else if( temp1 != NULL && temp2 == NULL )
+          return -1;
+
+      return 0;
+}