mirror of
git://projects.qi-hardware.com/wernermisc.git
synced 2024-12-22 12:25:11 +02:00
qpkg/jrb.c: major whitespace readjustment (converted from GNU to K&R style)
This commit is contained in:
Werner Almesberger
parent
dec07f359a
commit
009f56c927
748
qpkg/jrb.c
748
qpkg/jrb.c
@ -51,453 +51,503 @@ static JRB rprev(JRB n);
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static void recolor(JRB n);
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static void single_rotate(JRB y, int l);
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#define isred(n) (n->red)
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#define isblack(n) (!isred(n))
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#define isleft(n) (n->left)
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#define isright(n) (!isleft(n))
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#define isint(n) (n->internal)
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#define isext(n) (!isint(n))
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#define ishead(n) (n->roothead & 2)
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#define isroot(n) (n->roothead & 1)
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#define getlext(n) ((struct jrb_node *)(n->key))
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#define isred(n) (n->red)
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#define isblack(n) (!isred(n))
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#define isleft(n) (n->left)
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#define isright(n) (!isleft(n))
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#define isint(n) (n->internal)
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#define isext(n) (!isint(n))
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#define ishead(n) (n->roothead & 2)
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#define isroot(n) (n->roothead & 1)
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#define getlext(n) ((struct jrb_node *) (n->key))
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#define setlext(node, val) node->key = (void *) (val)
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#define getrext(n) ((struct jrb_node *)(n->val))
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#define getrext(n) ((struct jrb_node *) (n->val))
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#define setrext(node, value) node->val = (void *) (value)
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#define setred(n) n->red = 1
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#define setblack(n) n->red = 0
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#define setleft(n) n->left = 1
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#define setright(n) n->left = 0
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#define sethead(n) (n->roothead |= 2)
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#define setroot(n) (n->roothead |= 1)
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#define setint(n) n->internal = 1
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#define setext(n) n->internal = 0
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#define setnormal(n) n->roothead = 0
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#define sibling(n) ((isleft(n)) ? n->parent->blink : n->parent->flink)
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#define setred(n) n->red = 1
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#define setblack(n) n->red = 0
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#define setleft(n) n->left = 1
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#define setright(n) n->left = 0
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#define sethead(n) (n->roothead |= 2)
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#define setroot(n) (n->roothead |= 1)
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#define setint(n) n->internal = 1
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#define setext(n) n->internal = 0
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#define setnormal(n) n->roothead = 0
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#define sibling(n) (isleft(n) ? n->parent->blink : n->parent->flink)
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static void insert(JRB item, JRB list) /* Inserts to the end of a list */
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{
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JRB last_node;
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JRB last_node;
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last_node = list->blink;
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last_node = list->blink;
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list->blink = item;
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last_node->flink = item;
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item->blink = last_node;
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item->flink = list;
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list->blink = item;
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last_node->flink = item;
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item->blink = last_node;
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item->flink = list;
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}
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static void delete_item(JRB item) /* Deletes an arbitrary iterm */
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{
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item->flink->blink = item->blink;
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item->blink->flink = item->flink;
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item->flink->blink = item->blink;
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item->blink->flink = item->flink;
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}
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#define mk_new_ext(new, kkkey, vvval) {\
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new = (JRB) malloc(sizeof(struct jrb_node));\
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new->val = vvval;\
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new->key = kkkey;\
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setext(new);\
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setblack(new);\
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setnormal(new);\
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#define mk_new_ext(new, kkkey, vvval) { \
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new = (JRB) malloc(sizeof(struct jrb_node)); \
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new->val = vvval; \
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new->key = kkkey; \
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setext(new); \
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setblack(new); \
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setnormal(new); \
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}
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static void mk_new_int(JRB l, JRB r, JRB p, int il)
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{
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JRB newnode;
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JRB newnode;
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newnode = (JRB) malloc(sizeof(struct jrb_node));
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setint(newnode);
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setred(newnode);
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setnormal(newnode);
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newnode->flink = l;
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newnode->blink = r;
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newnode->parent = p;
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setlext(newnode, l);
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setrext(newnode, r);
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l->parent = newnode;
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r->parent = newnode;
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setleft(l);
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setright(r);
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if (ishead(p)) {
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p->parent = newnode;
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setroot(newnode);
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} else if (il) {
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setleft(newnode);
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p->flink = newnode;
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} else {
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setright(newnode);
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p->blink = newnode;
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}
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recolor(newnode);
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newnode = (JRB) malloc(sizeof(struct jrb_node));
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setint(newnode);
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setred(newnode);
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setnormal(newnode);
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newnode->flink = l;
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newnode->blink = r;
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newnode->parent = p;
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setlext(newnode, l);
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setrext(newnode, r);
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l->parent = newnode;
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r->parent = newnode;
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setleft(l);
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setright(r);
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if (ishead(p)) {
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p->parent = newnode;
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setroot(newnode);
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} else if (il) {
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setleft(newnode);
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p->flink = newnode;
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} else {
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setright(newnode);
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p->blink = newnode;
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}
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recolor(newnode);
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}
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JRB lprev(JRB n)
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{
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if (ishead(n)) return n;
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while (!isroot(n)) {
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if (isright(n)) return n->parent;
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n = n->parent;
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}
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return n->parent;
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if (ishead(n))
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return n;
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while (!isroot(n)) {
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if (isright(n))
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return n->parent;
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n = n->parent;
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}
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return n->parent;
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}
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JRB rprev(JRB n)
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{
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if (ishead(n)) return n;
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while (!isroot(n)) {
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if (isleft(n)) return n->parent;
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n = n->parent;
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}
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return n->parent;
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if (ishead(n))
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return n;
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while (!isroot(n)) {
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if (isleft(n))
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return n->parent;
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n = n->parent;
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}
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return n->parent;
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}
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JRB make_jrb(void)
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{
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JRB head;
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JRB head;
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head = (JRB) malloc (sizeof(struct jrb_node));
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head->flink = head;
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head->blink = head;
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head->parent = head;
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head->key = NULL;
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sethead(head);
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return head;
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head = (JRB) malloc(sizeof(struct jrb_node));
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head->flink = head;
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head->blink = head;
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head->parent = head;
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head->key = NULL;
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sethead(head);
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return head;
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}
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JRB jrb_find_gte(JRB n, const void *key,
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int (*fxn)(const void *, const void *), int *fnd)
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{
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int cmp;
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int cmp;
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*fnd = 0;
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if (!ishead(n)) {
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fprintf(stderr, "jrb_find_gte_str called on non-head %p\n", n);
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exit(1);
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}
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if (n->parent == n) return n;
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cmp = (*fxn)(key, n->blink->key);
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if (cmp == 0) {
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*fnd = 1;
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return n->blink;
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}
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if (cmp > 0) return n;
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else n = n->parent;
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while (1) {
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if (isext(n)) return n;
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cmp = (*fxn)(key, getlext(n)->key);
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if (cmp == 0) {
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*fnd = 1;
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return getlext(n);
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}
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if (cmp < 0) n = n->flink ; else n = n->blink;
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}
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*fnd = 0;
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if (!ishead(n)) {
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fprintf(stderr, "jrb_find_gte_str called on non-head %p\n", n);
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exit(1);
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}
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if (n->parent == n)
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return n;
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cmp = (*fxn)(key, n->blink->key);
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if (cmp == 0) {
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*fnd = 1;
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return n->blink;
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}
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if (cmp > 0)
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return n;
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else
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n = n->parent;
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while (1) {
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if (isext(n))
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return n;
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cmp = (*fxn)(key, getlext(n)->key);
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if (cmp == 0) {
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*fnd = 1;
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return getlext(n);
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}
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if (cmp < 0)
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n = n->flink;
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else
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n = n->blink;
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}
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}
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JRB jrb_find(JRB n, const void *key, int (*fxn)(const void *, const void *))
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{
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int fnd;
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JRB j;
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int fnd;
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JRB j;
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j = jrb_find_gte(n, key, fxn, &fnd);
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if (fnd) return j; else return NULL;
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j = jrb_find_gte(n, key, fxn, &fnd);
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if (fnd)
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return j;
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else
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return NULL;
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}
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static JRB jrb_insert_b(JRB n, void *key, void *val)
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{
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JRB newleft, newright, newnode, p;
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JRB newleft, newright, newnode, p;
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if (ishead(n)) {
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if (n->parent == n) { /* Tree is empty */
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mk_new_ext(newnode, key, val);
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insert(newnode, n);
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n->parent = newnode;
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newnode->parent = n;
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setroot(newnode);
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return newnode;
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} else {
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mk_new_ext(newright, key, val);
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insert(newright, n);
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newleft = newright->blink;
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setnormal(newleft);
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mk_new_int(newleft, newright, newleft->parent, isleft(newleft));
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p = rprev(newright);
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if (!ishead(p)) setlext(p, newright);
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return newright;
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}
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} else {
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mk_new_ext(newleft, key, val);
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insert(newleft, n);
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setnormal(n);
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mk_new_int(newleft, n, n->parent, isleft(n));
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p = lprev(newleft);
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if (!ishead(p)) setrext(p, newleft);
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return newleft;
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}
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if (ishead(n)) {
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if (n->parent == n) { /* Tree is empty */
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mk_new_ext(newnode, key, val);
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insert(newnode, n);
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n->parent = newnode;
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newnode->parent = n;
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setroot(newnode);
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return newnode;
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} else {
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mk_new_ext(newright, key, val);
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insert(newright, n);
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newleft = newright->blink;
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setnormal(newleft);
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mk_new_int(newleft, newright, newleft->parent,
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isleft(newleft));
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p = rprev(newright);
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if (!ishead(p))
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setlext(p, newright);
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return newright;
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}
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} else {
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mk_new_ext(newleft, key, val);
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insert(newleft, n);
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setnormal(n);
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mk_new_int(newleft, n, n->parent, isleft(n));
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p = lprev(newleft);
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if (!ishead(p))
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setrext(p, newleft);
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return newleft;
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}
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}
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static void recolor(JRB n)
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{
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JRB p, gp, s;
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int done = 0;
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JRB p, gp, s;
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int done = 0;
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while(!done) {
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if (isroot(n)) {
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setblack(n);
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return;
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}
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while(!done) {
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if (isroot(n)) {
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setblack(n);
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return;
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}
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p = n->parent;
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p = n->parent;
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if (isblack(p)) return;
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if (isblack(p))
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return;
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if (isroot(p)) {
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setblack(p);
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return;
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}
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if (isroot(p)) {
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setblack(p);
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return;
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}
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gp = p->parent;
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s = sibling(p);
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if (isred(s)) {
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setblack(p);
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setred(gp);
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setblack(s);
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n = gp;
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} else {
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done = 1;
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}
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}
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/* p's sibling is black, p is red, gp is black */
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gp = p->parent;
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s = sibling(p);
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if (isred(s)) {
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setblack(p);
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setred(gp);
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setblack(s);
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n = gp;
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} else {
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done = 1;
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}
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}
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/* p's sibling is black, p is red, gp is black */
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if ((isleft(n) == 0) == (isleft(p) == 0)) {
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single_rotate(gp, isleft(n));
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setblack(p);
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setred(gp);
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} else {
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single_rotate(p, isleft(n));
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single_rotate(gp, isleft(n));
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setblack(n);
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setred(gp);
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}
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if ((isleft(n) == 0) == (isleft(p) == 0)) {
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single_rotate(gp, isleft(n));
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setblack(p);
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setred(gp);
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} else {
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single_rotate(p, isleft(n));
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single_rotate(gp, isleft(n));
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setblack(n);
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setred(gp);
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}
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}
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static void single_rotate(JRB y, int l)
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{
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int rl = 0 /* for gcc */, ir;
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JRB x, yp;
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int rl = 0 /* for gcc */, ir;
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JRB x, yp;
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ir = isroot(y);
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yp = y->parent;
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if (!ir) {
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rl = isleft(y);
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}
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ir = isroot(y);
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yp = y->parent;
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if (!ir)
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rl = isleft(y);
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if (l) {
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x = y->flink;
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y->flink = x->blink;
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setleft(y->flink);
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y->flink->parent = y;
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x->blink = y;
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setright(y);
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} else {
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x = y->blink;
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y->blink = x->flink;
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setright(y->blink);
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y->blink->parent = y;
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x->flink = y;
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setleft(y);
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}
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if (l) {
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x = y->flink;
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y->flink = x->blink;
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setleft(y->flink);
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y->flink->parent = y;
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x->blink = y;
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setright(y);
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} else {
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x = y->blink;
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y->blink = x->flink;
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setright(y->blink);
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y->blink->parent = y;
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x->flink = y;
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setleft(y);
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}
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x->parent = yp;
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y->parent = x;
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if (ir) {
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yp->parent = x;
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setnormal(y);
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setroot(x);
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} else {
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if (rl) {
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yp->flink = x;
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setleft(x);
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} else {
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yp->blink = x;
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setright(x);
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}
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}
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x->parent = yp;
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y->parent = x;
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if (ir) {
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yp->parent = x;
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setnormal(y);
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setroot(x);
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} else {
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if (rl) {
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yp->flink = x;
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setleft(x);
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} else {
|
||||
yp->blink = x;
|
||||
setright(x);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
void jrb_delete_node(JRB n)
|
||||
{
|
||||
JRB s, p, gp;
|
||||
char ir;
|
||||
JRB s, p, gp;
|
||||
char ir;
|
||||
|
||||
if (isint(n)) {
|
||||
fprintf(stderr, "Cannot delete an internal node: %p\n", n);
|
||||
exit(1);
|
||||
}
|
||||
if (ishead(n)) {
|
||||
fprintf(stderr, "Cannot delete the head of an jrb_tree: %p\n", n);
|
||||
exit(1);
|
||||
}
|
||||
delete_item(n); /* Delete it from the list */
|
||||
p = n->parent; /* The only node */
|
||||
if (isroot(n)) {
|
||||
p->parent = p;
|
||||
free(n);
|
||||
return;
|
||||
}
|
||||
s = sibling(n); /* The only node after deletion */
|
||||
if (isroot(p)) {
|
||||
s->parent = p->parent;
|
||||
s->parent->parent = s;
|
||||
setroot(s);
|
||||
free(p);
|
||||
free(n);
|
||||
return;
|
||||
}
|
||||
gp = p->parent; /* Set parent to sibling */
|
||||
s->parent = gp;
|
||||
if (isleft(p)) {
|
||||
gp->flink = s;
|
||||
setleft(s);
|
||||
} else {
|
||||
gp->blink = s;
|
||||
setright(s);
|
||||
}
|
||||
ir = isred(p);
|
||||
free(p);
|
||||
free(n);
|
||||
if (isint(n)) {
|
||||
fprintf(stderr, "Cannot delete an internal node: %p\n", n);
|
||||
exit(1);
|
||||
}
|
||||
if (ishead(n)) {
|
||||
fprintf(stderr,
|
||||
"Cannot delete the head of an jrb_tree: %p\n", n);
|
||||
exit(1);
|
||||
}
|
||||
delete_item(n); /* Delete it from the list */
|
||||
p = n->parent; /* The only node */
|
||||
if (isroot(n)) {
|
||||
p->parent = p;
|
||||
free(n);
|
||||
return;
|
||||
}
|
||||
s = sibling(n); /* The only node after deletion */
|
||||
if (isroot(p)) {
|
||||
s->parent = p->parent;
|
||||
s->parent->parent = s;
|
||||
setroot(s);
|
||||
free(p);
|
||||
free(n);
|
||||
return;
|
||||
}
|
||||
gp = p->parent; /* Set parent to sibling */
|
||||
s->parent = gp;
|
||||
if (isleft(p)) {
|
||||
gp->flink = s;
|
||||
setleft(s);
|
||||
} else {
|
||||
gp->blink = s;
|
||||
setright(s);
|
||||
}
|
||||
ir = isred(p);
|
||||
free(p);
|
||||
free(n);
|
||||
|
||||
if (isext(s)) { /* Update proper rext and lext values */
|
||||
p = lprev(s);
|
||||
if (!ishead(p)) setrext(p, s);
|
||||
p = rprev(s);
|
||||
if (!ishead(p)) setlext(p, s);
|
||||
} else if (isblack(s)) {
|
||||
fprintf(stderr, "DELETION PROB -- sib is black, internal\n");
|
||||
exit(1);
|
||||
} else {
|
||||
p = lprev(s);
|
||||
if (!ishead(p)) setrext(p, s->flink);
|
||||
p = rprev(s);
|
||||
if (!ishead(p)) setlext(p, s->blink);
|
||||
setblack(s);
|
||||
return;
|
||||
}
|
||||
if (isext(s)) { /* Update proper rext and lext values */
|
||||
p = lprev(s);
|
||||
if (!ishead(p))
|
||||
setrext(p, s);
|
||||
p = rprev(s);
|
||||
if (!ishead(p))
|
||||
setlext(p, s);
|
||||
} else if (isblack(s)) {
|
||||
fprintf(stderr, "DELETION PROB -- sib is black, internal\n");
|
||||
exit(1);
|
||||
} else {
|
||||
p = lprev(s);
|
||||
if (!ishead(p))
|
||||
setrext(p, s->flink);
|
||||
p = rprev(s);
|
||||
if (!ishead(p))
|
||||
setlext(p, s->blink);
|
||||
setblack(s);
|
||||
return;
|
||||
}
|
||||
|
||||
if (ir) return;
|
||||
if (ir)
|
||||
return;
|
||||
|
||||
/* Recolor */
|
||||
/* Recolor */
|
||||
|
||||
n = s;
|
||||
p = n->parent;
|
||||
s = sibling(n);
|
||||
while(isblack(p) && isblack(s) && isint(s) &&
|
||||
isblack(s->flink) && isblack(s->blink)) {
|
||||
setred(s);
|
||||
n = p;
|
||||
if (isroot(n)) return;
|
||||
p = n->parent;
|
||||
s = sibling(n);
|
||||
}
|
||||
n = s;
|
||||
p = n->parent;
|
||||
s = sibling(n);
|
||||
while(isblack(p) && isblack(s) && isint(s) &&
|
||||
isblack(s->flink) && isblack(s->blink)) {
|
||||
setred(s);
|
||||
n = p;
|
||||
if (isroot(n))
|
||||
return;
|
||||
p = n->parent;
|
||||
s = sibling(n);
|
||||
}
|
||||
|
||||
if (isblack(p) && isred(s)) { /* Rotation 2.3b */
|
||||
single_rotate(p, isright(n));
|
||||
setred(p);
|
||||
setblack(s);
|
||||
s = sibling(n);
|
||||
}
|
||||
if (isblack(p) && isred(s)) { /* Rotation 2.3b */
|
||||
single_rotate(p, isright(n));
|
||||
setred(p);
|
||||
setblack(s);
|
||||
s = sibling(n);
|
||||
}
|
||||
|
||||
{ JRB x, z; char il;
|
||||
{
|
||||
JRB x, z; char il;
|
||||
|
||||
if (isext(s)) {
|
||||
fprintf(stderr, "DELETION ERROR: sibling not internal\n");
|
||||
exit(1);
|
||||
}
|
||||
if (isext(s)) {
|
||||
fprintf(stderr,
|
||||
"DELETION ERROR: sibling not internal\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
il = isleft(n);
|
||||
x = il ? s->flink : s->blink ;
|
||||
z = sibling(x);
|
||||
il = isleft(n);
|
||||
x = il ? s->flink : s->blink;
|
||||
z = sibling(x);
|
||||
|
||||
if (isred(z)) { /* Rotation 2.3f */
|
||||
single_rotate(p, !il);
|
||||
setblack(z);
|
||||
if (isred(p)) setred(s); else setblack(s);
|
||||
setblack(p);
|
||||
} else if (isblack(x)) { /* Recoloring only (2.3c) */
|
||||
if (isred(s) || isblack(p)) {
|
||||
fprintf(stderr, "DELETION ERROR: 2.3c not quite right\n");
|
||||
exit(1);
|
||||
}
|
||||
setblack(p);
|
||||
setred(s);
|
||||
return;
|
||||
} else if (isred(p)) { /* 2.3d */
|
||||
single_rotate(s, il);
|
||||
single_rotate(p, !il);
|
||||
setblack(x);
|
||||
setred(s);
|
||||
return;
|
||||
} else { /* 2.3e */
|
||||
single_rotate(s, il);
|
||||
single_rotate(p, !il);
|
||||
setblack(x);
|
||||
return;
|
||||
}
|
||||
}
|
||||
if (isred(z)) { /* Rotation 2.3f */
|
||||
single_rotate(p, !il);
|
||||
setblack(z);
|
||||
if (isred(p))
|
||||
setred(s);
|
||||
else
|
||||
setblack(s);
|
||||
setblack(p);
|
||||
} else if (isblack(x)) { /* Recoloring only (2.3c) */
|
||||
if (isred(s) || isblack(p)) {
|
||||
fprintf(stderr,
|
||||
"DELETION ERROR: 2.3c not quite right\n");
|
||||
exit(1);
|
||||
}
|
||||
setblack(p);
|
||||
setred(s);
|
||||
return;
|
||||
} else if (isred(p)) { /* 2.3d */
|
||||
single_rotate(s, il);
|
||||
single_rotate(p, !il);
|
||||
setblack(x);
|
||||
setred(s);
|
||||
return;
|
||||
} else { /* 2.3e */
|
||||
single_rotate(s, il);
|
||||
single_rotate(p, !il);
|
||||
setblack(x);
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
int jrb_nblack(JRB n)
|
||||
{
|
||||
int nb;
|
||||
if (ishead(n) || isint(n)) {
|
||||
fprintf(stderr, "ERROR: jrb_nblack called on a non-external node %p\n", n);
|
||||
exit(1);
|
||||
}
|
||||
nb = 0;
|
||||
while(!ishead(n)) {
|
||||
if (isblack(n)) nb++;
|
||||
n = n->parent;
|
||||
}
|
||||
return nb;
|
||||
int nb;
|
||||
|
||||
if (ishead(n) || isint(n)) {
|
||||
fprintf(stderr,
|
||||
"ERROR: jrb_nblack called on a non-external node %p\n", n);
|
||||
exit(1);
|
||||
}
|
||||
nb = 0;
|
||||
while(!ishead(n)) {
|
||||
if (isblack(n)) nb++;
|
||||
n = n->parent;
|
||||
}
|
||||
return nb;
|
||||
}
|
||||
|
||||
|
||||
int jrb_plength(JRB n)
|
||||
{
|
||||
int pl;
|
||||
if (ishead(n) || isint(n)) {
|
||||
fprintf(stderr, "ERROR: jrb_plength called on a non-external node %p\n", n);
|
||||
exit(1);
|
||||
}
|
||||
pl = 0;
|
||||
while(!ishead(n)) {
|
||||
pl++;
|
||||
n = n->parent;
|
||||
}
|
||||
return pl;
|
||||
int pl;
|
||||
|
||||
if (ishead(n) || isint(n)) {
|
||||
fprintf(stderr,
|
||||
"ERROR: jrb_plength called on a non-external node %p\n", n);
|
||||
exit(1);
|
||||
}
|
||||
pl = 0;
|
||||
while (!ishead(n)) {
|
||||
pl++;
|
||||
n = n->parent;
|
||||
}
|
||||
return pl;
|
||||
}
|
||||
|
||||
|
||||
void jrb_free_tree(JRB n)
|
||||
{
|
||||
if (!ishead(n)) {
|
||||
fprintf(stderr, "ERROR: Rb_free_tree called on a non-head node\n");
|
||||
exit(1);
|
||||
}
|
||||
if (!ishead(n)) {
|
||||
fprintf(stderr,
|
||||
"ERROR: Rb_free_tree called on a non-head node\n");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
while(jrb_first(n) != jrb_nil(n)) {
|
||||
jrb_delete_node(jrb_first(n));
|
||||
}
|
||||
free(n);
|
||||
while(jrb_first(n) != jrb_nil(n))
|
||||
jrb_delete_node(jrb_first(n));
|
||||
|
||||
free(n);
|
||||
}
|
||||
|
||||
|
||||
void *jrb_val(JRB n)
|
||||
{
|
||||
return n->val;
|
||||
return n->val;
|
||||
}
|
||||
|
||||
|
||||
JRB jrb_insert(JRB tree, void *key, void *val,
|
||||
int (*func)(const void *, const void *))
|
||||
int (*func)(const void *a, const void *b))
|
||||
{
|
||||
int fnd;
|
||||
int fnd;
|
||||
|
||||
return jrb_insert_b(jrb_find_gte(tree, key, func, &fnd), key, val);
|
||||
return jrb_insert_b(jrb_find_gte(tree, key, func, &fnd), key, val);
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user