mirror of
git://projects.qi-hardware.com/wernermisc.git
synced 2024-11-22 14:42:49 +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
142
qpkg/jrb.c
142
qpkg/jrb.c
@ -59,9 +59,9 @@ static void single_rotate(JRB y, int l);
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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 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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@ -72,7 +72,8 @@ static void single_rotate(JRB y, int l);
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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 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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@ -86,19 +87,20 @@ static void insert(JRB item, JRB list) /* Inserts to the end of a list */
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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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}
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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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@ -134,29 +136,35 @@ static void mk_new_int(JRB l, JRB r, JRB p, int il)
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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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if (ishead(n))
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return n;
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while (!isroot(n)) {
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if (isright(n)) return n->parent;
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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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if (ishead(n))
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return n;
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while (!isroot(n)) {
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if (isleft(n)) return n->parent;
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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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head = (JRB) malloc (sizeof(struct jrb_node));
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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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@ -165,6 +173,7 @@ JRB make_jrb(void)
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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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@ -175,34 +184,46 @@ JRB jrb_find_gte(JRB n, const void *key,
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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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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) return n;
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else n = n->parent;
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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)) return n;
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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) n = n->flink ; else n = n->blink;
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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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j = jrb_find_gte(n, key, fxn, &fnd);
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if (fnd) return j; else return NULL;
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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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@ -220,9 +241,11 @@ static JRB jrb_insert_b(JRB n, void *key, void *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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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)) setlext(p, 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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@ -231,11 +254,13 @@ static JRB jrb_insert_b(JRB n, void *key, void *val)
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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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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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@ -249,7 +274,8 @@ static void recolor(JRB n)
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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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@ -281,6 +307,7 @@ static void recolor(JRB n)
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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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@ -288,9 +315,8 @@ static void single_rotate(JRB y, int l)
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ir = isroot(y);
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yp = y->parent;
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if (!ir) {
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if (!ir)
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rl = isleft(y);
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}
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if (l) {
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x = y->flink;
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@ -325,6 +351,7 @@ static void single_rotate(JRB y, int l)
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}
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}
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void jrb_delete_node(JRB n)
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{
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JRB s, p, gp;
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@ -335,7 +362,8 @@ void jrb_delete_node(JRB n)
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exit(1);
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}
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if (ishead(n)) {
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fprintf(stderr, "Cannot delete the head of an jrb_tree: %p\n", n);
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fprintf(stderr,
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"Cannot delete the head of an jrb_tree: %p\n", n);
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exit(1);
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}
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delete_item(n); /* Delete it from the list */
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@ -369,22 +397,27 @@ void jrb_delete_node(JRB n)
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if (isext(s)) { /* Update proper rext and lext values */
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p = lprev(s);
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if (!ishead(p)) setrext(p, s);
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if (!ishead(p))
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setrext(p, s);
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p = rprev(s);
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if (!ishead(p)) setlext(p, s);
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if (!ishead(p))
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setlext(p, s);
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} else if (isblack(s)) {
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fprintf(stderr, "DELETION PROB -- sib is black, internal\n");
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exit(1);
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} else {
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p = lprev(s);
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if (!ishead(p)) setrext(p, s->flink);
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if (!ishead(p))
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setrext(p, s->flink);
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p = rprev(s);
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if (!ishead(p)) setlext(p, s->blink);
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if (!ishead(p))
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setlext(p, s->blink);
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setblack(s);
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return;
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}
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if (ir) return;
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if (ir)
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return;
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/* Recolor */
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@ -395,7 +428,8 @@ void jrb_delete_node(JRB n)
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isblack(s->flink) && isblack(s->blink)) {
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setred(s);
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n = p;
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if (isroot(n)) return;
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if (isroot(n))
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return;
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p = n->parent;
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s = sibling(n);
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}
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@ -407,25 +441,31 @@ void jrb_delete_node(JRB n)
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s = sibling(n);
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}
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{ JRB x, z; char il;
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{
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JRB x, z; char il;
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if (isext(s)) {
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fprintf(stderr, "DELETION ERROR: sibling not internal\n");
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fprintf(stderr,
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"DELETION ERROR: sibling not internal\n");
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exit(1);
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}
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il = isleft(n);
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x = il ? s->flink : s->blink ;
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x = il ? s->flink : s->blink;
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z = sibling(x);
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if (isred(z)) { /* Rotation 2.3f */
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single_rotate(p, !il);
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setblack(z);
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if (isred(p)) setred(s); else setblack(s);
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if (isred(p))
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setred(s);
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else
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setblack(s);
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setblack(p);
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} else if (isblack(x)) { /* Recoloring only (2.3c) */
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if (isred(s) || isblack(p)) {
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fprintf(stderr, "DELETION ERROR: 2.3c not quite right\n");
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fprintf(stderr,
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"DELETION ERROR: 2.3c not quite right\n");
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exit(1);
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}
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setblack(p);
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@ -446,11 +486,14 @@ void jrb_delete_node(JRB n)
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}
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}
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int jrb_nblack(JRB n)
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{
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int nb;
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if (ishead(n) || isint(n)) {
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fprintf(stderr, "ERROR: jrb_nblack called on a non-external node %p\n", n);
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fprintf(stderr,
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"ERROR: jrb_nblack called on a non-external node %p\n", n);
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exit(1);
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}
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nb = 0;
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@ -461,41 +504,48 @@ int jrb_nblack(JRB n)
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return nb;
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}
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int jrb_plength(JRB n)
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{
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int pl;
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if (ishead(n) || isint(n)) {
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fprintf(stderr, "ERROR: jrb_plength called on a non-external node %p\n", n);
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fprintf(stderr,
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"ERROR: jrb_plength called on a non-external node %p\n", n);
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exit(1);
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}
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pl = 0;
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while(!ishead(n)) {
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while (!ishead(n)) {
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pl++;
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n = n->parent;
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}
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return pl;
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}
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void jrb_free_tree(JRB n)
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{
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if (!ishead(n)) {
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fprintf(stderr, "ERROR: Rb_free_tree called on a non-head node\n");
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fprintf(stderr,
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"ERROR: Rb_free_tree called on a non-head node\n");
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exit(1);
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}
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while(jrb_first(n) != jrb_nil(n)) {
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while(jrb_first(n) != jrb_nil(n))
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jrb_delete_node(jrb_first(n));
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}
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free(n);
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}
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void *jrb_val(JRB n)
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{
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return n->val;
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}
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JRB jrb_insert(JRB tree, void *key, void *val,
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int (*func)(const void *, const void *))
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int (*func)(const void *a, const void *b))
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{
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int fnd;
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