X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Flist%2Flist.c;h=29dc30ba195876690eba54cac576336cb1461a41;hp=fad40cb80b3e00938ead3ecbe96c415c55a3973d;hb=ac9d55d8c5af9697be8c4dd4f27de61e3cb8bf95;hpb=22ffb884ca6a5f16517e49e051d8fb5a22e5049d

diff --git a/ccan/list/list.c b/ccan/list/list.c
index fad40cb8..29dc30ba 100644
--- a/ccan/list/list.c
+++ b/ccan/list/list.c
@@ -1,7 +1,22 @@
+/* Licensed under LGPLv2.1+ - see LICENSE file for details */
 #include <stdio.h>
 #include <stdlib.h>
 #include "list.h"
 
+static void *corrupt(const char *abortstr,
+		     const struct list_node *head,
+		     const struct list_node *node,
+		     unsigned int count)
+{
+	if (abortstr) {
+		fprintf(stderr,
+			"%s: prev corrupt in node %p (%u) of %p\n",
+			abortstr, node, count, head);
+		abort();
+	}
+	return NULL;
+}
+
 struct list_node *list_check_node(const struct list_node *node,
 				  const char *abortstr)
 {
@@ -10,31 +25,18 @@ struct list_node *list_check_node(const struct list_node *node,
 
 	for (p = node, n = node->next; n != node; p = n, n = n->next) {
 		count++;
-		if (n->prev != p) {
-			if (!abortstr)
-				return NULL;
-			fprintf(stderr,
-				"%s: prev corrupt in node %p (%u) of %p\n",
-				abortstr, n, count, node);
-			abort();
-		}
+		if (n->prev != p)
+			return corrupt(abortstr, node, n, count);
 	}
+	/* Check prev on head node. */
+	if (node->prev != p)
+		return corrupt(abortstr, node, node, 0);
+
 	return (struct list_node *)node;
 }
 
 struct list_head *list_check(const struct list_head *h, const char *abortstr)
 {
-	if (h->n.next == &h->n) {
-		if (h->n.prev != &h->n) {
-			if (!abortstr)
-				return NULL;
-			fprintf(stderr, "%s: prev corrupt in empty %p\n",
-				abortstr, h);
-			abort();
-		}
-		return (struct list_head *)h;
-	}
-
 	if (!list_check_node(&h->n, abortstr))
 		return NULL;
 	return (struct list_head *)h;