From: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Date: Thu, 1 Dec 2011 17:27:42 +0000 (-0200)
Subject: Add kmod_list_remove_n_latest()
X-Git-Tag: v1~158
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=62be799554c468b483afdda36f6e9903662aab23;p=thirdparty%2Fkmod.git

Add kmod_list_remove_n_latest()
---

diff --git a/libkmod/libkmod-list.c b/libkmod/libkmod-list.c
index d74d66df..d9caba0e 100644
--- a/libkmod/libkmod-list.c
+++ b/libkmod/libkmod-list.c
@@ -138,6 +138,34 @@ struct kmod_list *kmod_list_remove_data(struct kmod_list *list,
 	return container_of(node, struct kmod_list, node);
 }
 
+/*
+ * n must be greater to or equal the number of elements (we don't check the
+ * condition
+ */
+struct kmod_list *kmod_list_remove_n_latest(struct kmod_list *list,
+							unsigned int n)
+{
+	struct kmod_list *l;
+	unsigned int i;
+
+	/*
+	 * Get last element, remove all appended elments and if list became
+	 * empty, set return pointer to NULL
+	 */
+	l = kmod_list_prev(list, list);
+	if (l == NULL)
+		l = list;
+
+	for (i = 0; i < n; i++)
+		l = kmod_list_remove(l);
+
+	/* If list became empty, save it*/
+	if (l == NULL)
+		list = NULL;
+
+	return list;
+}
+
 KMOD_EXPORT struct kmod_list *kmod_list_prev(struct kmod_list *list,
 							struct kmod_list *curr)
 {
diff --git a/libkmod/libkmod-private.h b/libkmod/libkmod-private.h
index 55626f2f..af1c93eb 100644
--- a/libkmod/libkmod-private.h
+++ b/libkmod/libkmod-private.h
@@ -51,7 +51,8 @@ struct kmod_list *kmod_list_prepend(struct kmod_list *list, void *data) __must_c
 struct kmod_list *kmod_list_remove(struct kmod_list *list);
 struct kmod_list *kmod_list_remove_data(struct kmod_list *list,
 					const void *data) __must_check;
-
+struct kmod_list *kmod_list_remove_n_latest(struct kmod_list *list,
+						unsigned int n) __must_check;
 
 /* libkmod.c */
 const char *kmod_get_dirname(struct kmod_ctx *ctx) __attribute__((nonnull(1)));