initial import of 386bsd-0.1 sources

1 files changed, 115 insertions, 0 deletions

diff --git a/atc/list.c b/atc/list.c
new file mode 100644
index 00000000..8da9da2f
--- /dev/null
+++ b/atc/list.c
@@ -0,0 +1,115 @@
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Ed James.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 1987 by Ed James, UC Berkeley.  All rights reserved.
+ *
+ * Copy permission is hereby granted provided that this notice is
+ * retained on all partial or complete copies.
+ *
+ * For more info on this and all of my stuff, mail edjames@berkeley.edu.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)list.c	5.2 (Berkeley) 4/30/90";
+#endif /* not lint */
+
+#include "include.h"
+
+PLANE	*
+newplane()
+{
+	return ((PLANE *) calloc(1, sizeof (PLANE)));
+}
+
+append(l, p)
+	LIST	*l;
+	PLANE	*p;
+{
+	PLANE 	*q = NULL, *r = NULL;
+
+	if (l->head == NULL) {
+		p->next = p->prev = NULL;
+		l->head = l->tail = p;
+	} else {
+		q = l -> head;
+
+		while (q != NULL && q->plane_no < p->plane_no) {
+			r = q;
+			q = q -> next;
+		}
+
+		if (q) {
+			if (r) {
+				p->prev = r;
+				r->next = p;
+				p->next = q;
+				q->prev = p;
+			} else {
+				p->next = q;
+				p->prev = NULL;
+				q->prev = p;
+				l->head = p;
+			}
+		} else {
+			l->tail->next = p;
+			p->next = NULL;
+			p->prev = l->tail;
+			l->tail = p;
+		}
+	}
+}
+
+delete(l, p)
+	LIST	*l;
+	PLANE	*p;
+{
+	if (l->head == NULL)
+		loser(p, "deleted a non-existant plane! Get help!");
+	
+	if (l->head == p && l->tail == p)
+		l->head = l->tail = NULL;
+	else if (l->head == p) {
+		l->head = p->next;
+		l->head->prev = NULL;
+	} else if (l->tail == p) {
+		l->tail = p->prev;
+		l->tail->next = NULL;
+	} else {
+		p->prev->next = p->next;
+		p->next->prev = p->prev;
+	}
+}