1 files changed, 120 insertions, 0 deletions
diff --git a/backend/dvi/mdvi-lib/list.c b/backend/dvi/mdvi-lib/list.c
new file mode 100644
index 00000000..eb73a178
--- /dev/null
+++ b/backend/dvi/mdvi-lib/list.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2000, Matias Atria
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+#include "common.h"
+
+void	listh_init(ListHead *head)
+{
+	head->head = head->tail = NULL;
+	head->count = 0;
+}
+
+void	listh_prepend(ListHead *head, List *list)
+{
+	list->prev = NULL;
+	list->next = head->head;
+	if(head->head)
+		head->head->prev = list;
+	head->head = list;
+	if(!head->tail)
+		head->tail = list;
+	head->count++;
+}
+
+void	listh_append(ListHead *head, List *list)
+{
+	list->next = NULL;
+	list->prev = head->tail;
+	if(head->tail)
+		head->tail->next = list;
+	else
+		head->head = list;
+	head->tail = list;
+	head->count++;
+}
+
+void	listh_add_before(ListHead *head, List *at, List *list)
+{
+	if(at == head->head || head->head == NULL)
+		listh_prepend(head, list);
+	else {
+		list->next = at;
+		list->prev = at->prev;
+		at->prev = list;
+		head->count++;
+	}
+}
+
+void	listh_add_after(ListHead *head, List *at, List *list)
+{
+	if(at == head->tail || !head->tail)
+		listh_append(head, list);
+	else {
+		list->prev = at;
+		list->next = at->next;
+		at->next = list;
+		head->count++;
+	}
+}
+
+void	listh_remove(ListHead *head, List *list)
+{
+	if(list == head->head) {
+		head->head = list->next;
+		if(head->head)
+			head->head->prev = NULL;
+	} else if(list == head->tail) {
+		head->tail = list->prev;
+		if(head->tail)
+			head->tail->next = NULL;
+	} else {
+		list->next->prev = list->prev;
+		list->prev->next = list->next;
+	}
+	if(--head->count == 0)
+		head->head = head->tail = NULL;
+}
+
+void	listh_concat(ListHead *h1, ListHead *h2)
+{
+	if(h2->head == NULL)
+		; /* do nothing */
+	else if(h1->tail == NULL)
+		h1->head = h2->head;
+	else {
+		h1->tail->next = h2->head;
+		h2->head->prev = h1->tail;
+	}
+	h1->tail = h2->tail;
+	h1->count += h2->count;
+}
+
+void	listh_catcon(ListHead *h1, ListHead *h2)
+{
+	if(h2->head == NULL)
+		; /* do nothing */
+	else if(h1->head == NULL)
+		h1->tail = h2->tail;
+	else {
+		h1->head->prev = h2->tail;
+		h2->tail->next = h1->head;
+	}
+	h1->head = h2->head;
+	h1->count += h2->count;
+}