Return a valid target when adding to linkmap if it exists

linkmap.c

@@ -39,6 +39,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
+#include <sys/syslimits.h>
 
 haggis_bucket* haggis_bucket_init(ino_t inode, uint64_t hash, char * path) {
     haggis_bucket *bucket;
@@ -58,12 +59,18 @@ void haggis_bucket_deinit(haggis_bucket *nod) {
     free(nod);
 }
 
-void haggis_bucket_append(haggis_bucket *head, haggis_bucket *tail) {
+char* haggis_bucket_search_append(haggis_bucket *head, haggis_bucket *tail) {
+    char* target;
 
     while (head->next != NULL) {
+        if (head->key.val == tail->key.val) {
+            target = strndup(head->path, PATH_MAX - 1);
+            return target;
+        }
         head = head->next;
     }
     head->next = tail;
+    return NULL;
 }
 
 haggis_linkmap* haggis_linkmap_init() {
@@ -131,7 +138,7 @@ char* haggis_linkmap_get_or_add(haggis_linkmap *map, ino_t inode, char * path) {
     } else {
         b = haggis_bucket_init(key.val, hash, path);
         if (b == NULL) return NULL;
-        haggis_bucket_append(&map->buckets[idx], b);
+        target = haggis_bucket_search_append(&map->buckets[idx], b);
     }
     return target;
 }