X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=util.c;h=a91d1bdc329d151ee9dad33ec7c1df34fd15c3ee;hb=644f831b887f220651fc651852cb4b668eae705c;hp=98c40c68a13e89d317992678da38c8361a617ea9;hpb=ee556f1413d9da165fd6ea74f0bf4039ab28da0d;p=wmpus

diff --git a/util.c b/util.c
index 98c40c6..a91d1bd 100644
--- a/util.c
+++ b/util.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
 
 #include "util.h"
 
@@ -10,10 +11,34 @@ list_t *list_insert(list_t *next, void *data)
 	node->next = next;
 	node->prev = next ? next->prev : NULL;
 	if (node->next) node->next->prev = node;
-	if (node->prev) node->next->next = node;
+	if (node->prev) node->prev->next = node;
 	return node;
 }
 
+void list_insert_after(list_t *prev, void *data)
+{
+	// prev must be valid,
+	// as we cannot return the original list head
+	list_t *node = new0(list_t);
+	node->data = data;
+	node->prev = prev;
+	node->next = prev->next;
+	prev->next = node;
+	if (node->next) node->next->prev = node;
+}
+
+list_t *list_append(list_t *head, void *data)
+{
+	list_t *last = head;
+	while (last->next)
+		last = last->next;
+	list_t *node = new0(list_t);
+	node->data = data;
+	node->prev = last;
+	if (last) last->next = node;
+	return last ? head : node;
+}
+
 list_t *list_remove(list_t *head, list_t *node)
 {
 	list_t *next = node->next;
@@ -32,6 +57,15 @@ int list_length(list_t *node)
 	return len;
 }
 
-void list_move(list_t *node, int offset)
+/* Misc */
+int error(char *fmt, ...)
 {
+	va_list ap;
+	va_start(ap, fmt);
+	fprintf(stderr, "Error: ");
+	vfprintf(stderr, fmt, ap);
+	fprintf(stderr, "\n");
+	va_end(ap);
+	exit(1);
+	return 0;
 }