1 files changed, 18 insertions, 15 deletions

diff --git a/6.5/hash.c b/6.5/hash.c
index 1e29bd7..cd9cf73 100644
--- a/6.5/hash.c
+++ b/6.5/hash.c
@@ -60,21 +60,24 @@ struct nlist *install(struct nlist *hashtab[], uint32_t hashsize,
 
 void undef(struct nlist *hashtab[], uint32_t hashsize, char *name)
 {
-	struct nlist *cur, *last;
-	uint32_t hashval = hash(name, hashsize);
-
-	for (cur = hashtab[hashval], last = NULL; cur !=NULL; last = cur,
-	     cur = cur->next) {
-		if (!strcmp(cur->name, name)) {
-			if (last == NULL)
-				hashtab[hashval] = cur->next;
-			else
-				last->next = cur->next;
-
-			cur->next = NULL;
-			nlfree(cur);
-			return;
-		}
+	struct nlist *np, *prev;
+	uint32_t h;
+
+	prev = NULL;
+	h = hash(name, hashsize);
+	for (np = hashtab[h]; np != NULL; prev = np, np = np->next)
+		if (!strcmp(name, np->name))
+			break;
+
+	if (np != NULL) {
+		if (prev == NULL)
+			hashtab[h] = np->next;
+		else
+			prev->next = np->next;
+
+		np->next = NULL;
+		nlfree(np);
+		return;
 	}
 }