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-rw-r--r--backend/dvi/mdvi-lib/list.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/backend/dvi/mdvi-lib/list.c b/backend/dvi/mdvi-lib/list.c
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+++ 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;
+}