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1.1 root 1: /*
2: * Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
3: *
4: * Copy permission is hereby granted provided that this notice is
5: * retained on all partial or complete copies.
6: *
7: * For more info on this and all of my stuff, mail [email protected].
8: */
9:
10: #include "include.h"
11:
12: PLANE *
13: newplane()
14: {
15: return ((PLANE *) calloc(1, sizeof (PLANE)));
16: }
17:
18: append(l, p)
19: LIST *l;
20: PLANE *p;
21: {
22: PLANE *q = NULL, *r = NULL;
23:
24: if (l->head == NULL) {
25: p->next = p->prev = NULL;
26: l->head = l->tail = p;
27: } else {
28: q = l -> head;
29:
30: while (q != NULL && q->plane_no < p->plane_no) {
31: r = q;
32: q = q -> next;
33: }
34:
35: if (q) {
36: if (r) {
37: p->prev = r;
38: r->next = p;
39: p->next = q;
40: q->prev = p;
41: } else {
42: p->next = q;
43: p->prev = NULL;
44: q->prev = p;
45: l->head = p;
46: }
47: } else {
48: l->tail->next = p;
49: p->next = NULL;
50: p->prev = l->tail;
51: l->tail = p;
52: }
53: }
54: }
55:
56: delete(l, p)
57: LIST *l;
58: PLANE *p;
59: {
60: if (l->head == NULL)
61: loser(p, "deleted a non-existant plane! Get help!");
62:
63: if (l->head == p && l->tail == p)
64: l->head = l->tail = NULL;
65: else if (l->head == p) {
66: l->head = p->next;
67: l->head->prev = NULL;
68: } else if (l->tail == p) {
69: l->tail = p->prev;
70: l->tail->next = NULL;
71: } else {
72: p->prev->next = p->next;
73: p->next->prev = p->prev;
74: }
75: }
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