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qpkg: added James S. Plank's red-black trees

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Werner Almesberger 2010-11-19 19:17:47 -03:00
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CFLAGS = -Wall -Wshadow -g
CFLAGS = -Wall -Wshadow -g -O
# -O, so that we get data flow analysis, which helps to find more bugs
#LDFLAGS=-pg
OBJS = gobble.o id.o prereq.o qpkg.o
OBJS = gobble.o id.o prereq.o qpkg.o jrb.o jval.o
all: qpkg

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Libraries for fields, doubly-linked lists and red-black trees.
Copyright (C) 2001 James S. Plank
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------
Please see http://www.cs.utk.edu/~plank/plank/classes/cs360/360/notes/Libfdr/
for instruction on how to use this library.
Jim Plank
plank@cs.utk.edu
http://www.cs.utk.edu/~plank
Associate Professor
Department of Computer Science
University of Tennessee
203 Claxton Complex
1122 Volunteer Blvd.
Knoxville, TN 37996-3450
865-974-4397
Fax: 865-974-4404

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/*
Libraries for fields, doubly-linked lists and red-black trees.
Copyright (C) 2001 James S. Plank
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------
Please see http://www.cs.utk.edu/~plank/plank/classes/cs360/360/notes/Libfdr/
for instruction on how to use this library.
Jim Plank
plank@cs.utk.edu
http://www.cs.utk.edu/~plank
Associate Professor
Department of Computer Science
University of Tennessee
203 Claxton Complex
1122 Volunteer Blvd.
Knoxville, TN 37996-3450
865-974-4397
Fax: 865-974-4404
*/
/* Revision 1.2. Jim Plank */
/* Original code by Jim Plank (plank@cs.utk.edu) */
/* modified for THINK C 6.0 for Macintosh by Chris Bartley */
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "jrb.h"
static void mk_new_int(JRB l, JRB r, JRB p, int il);
static JRB lprev(JRB n);
static JRB rprev(JRB n);
static void recolor(JRB n);
static void single_rotate(JRB y, int l);
static void jrb_print_tree(JRB t, int level);
static void jrb_iprint_tree(JRB t, int level);
#define isred(n) (n->red)
#define isblack(n) (!isred(n))
#define isleft(n) (n->left)
#define isright(n) (!isleft(n))
#define isint(n) (n->internal)
#define isext(n) (!isint(n))
#define ishead(n) (n->roothead & 2)
#define isroot(n) (n->roothead & 1)
#define getlext(n) ((struct jrb_node *)(n->key.v))
#define setlext(node, val) node->key.v = (void *) (val)
#define getrext(n) ((struct jrb_node *)(n->val.v))
#define setrext(node, value) node->val.v = (void *) (value)
#define setred(n) n->red = 1
#define setblack(n) n->red = 0
#define setleft(n) n->left = 1
#define setright(n) n->left = 0
#define sethead(n) (n->roothead |= 2)
#define setroot(n) (n->roothead |= 1)
#define setint(n) n->internal = 1
#define setext(n) n->internal = 0
#define setnormal(n) n->roothead = 0
#define sibling(n) ((isleft(n)) ? n->parent->blink : n->parent->flink)
static void insert(JRB item, JRB list) /* Inserts to the end of a list */
{
JRB last_node;
last_node = list->blink;
list->blink = item;
last_node->flink = item;
item->blink = last_node;
item->flink = list;
}
static void delete_item(JRB item) /* Deletes an arbitrary iterm */
{
item->flink->blink = item->blink;
item->blink->flink = item->flink;
}
#define mk_new_ext(new, kkkey, vvval) {\
new = (JRB) malloc(sizeof(struct jrb_node));\
new->val = vvval;\
new->key = kkkey;\
setext(new);\
setblack(new);\
setnormal(new);\
}
static void mk_new_int(JRB l, JRB r, JRB p, int il)
{
JRB newnode;
newnode = (JRB) malloc(sizeof(struct jrb_node));
setint(newnode);
setred(newnode);
setnormal(newnode);
newnode->flink = l;
newnode->blink = r;
newnode->parent = p;
setlext(newnode, l);
setrext(newnode, r);
l->parent = newnode;
r->parent = newnode;
setleft(l);
setright(r);
if (ishead(p)) {
p->parent = newnode;
setroot(newnode);
} else if (il) {
setleft(newnode);
p->flink = newnode;
} else {
setright(newnode);
p->blink = newnode;
}
recolor(newnode);
}
JRB lprev(JRB n)
{
if (ishead(n)) return n;
while (!isroot(n)) {
if (isright(n)) return n->parent;
n = n->parent;
}
return n->parent;
}
JRB rprev(JRB n)
{
if (ishead(n)) return n;
while (!isroot(n)) {
if (isleft(n)) return n->parent;
n = n->parent;
}
return n->parent;
}
JRB make_jrb(void)
{
JRB head;
head = (JRB) malloc (sizeof(struct jrb_node));
head->flink = head;
head->blink = head;
head->parent = head;
head->key.s = "";
sethead(head);
return head;
}
JRB jrb_find_gte_str(JRB n, char *key, int *fnd)
{
int cmp;
*fnd = 0;
if (!ishead(n)) {
fprintf(stderr, "jrb_find_gte_str called on non-head %p\n", n);
exit(1);
}
if (n->parent == n) return n;
cmp = strcmp(key, n->blink->key.s);
if (cmp == 0) {
*fnd = 1;
return n->blink;
}
if (cmp > 0) return n;
else n = n->parent;
while (1) {
if (isext(n)) return n;
cmp = strcmp(key, getlext(n)->key.s);
if (cmp == 0) {
*fnd = 1;
return getlext(n);
}
if (cmp < 0) n = n->flink ; else n = n->blink;
}
}
JRB jrb_find_str(JRB n, char *key)
{
int fnd;
JRB j;
j = jrb_find_gte_str(n, key, &fnd);
if (fnd) return j; else return NULL;
}
JRB jrb_find_gte_int(JRB n, int ikey, int *fnd)
{
*fnd = 0;
if (!ishead(n)) {
fprintf(stderr, "jrb_find_gte_int called on non-head %p\n", n);
exit(1);
}
if (n->parent == n) return n;
if (ikey == n->blink->key.i) {
*fnd = 1;
return n->blink;
}
if (ikey > n->blink->key.i) return n;
else n = n->parent;
while (1) {
if (isext(n)) return n;
if (ikey == getlext(n)->key.i) {
*fnd = 1;
return getlext(n);
}
n = (ikey < getlext(n)->key.i) ? n->flink : n->blink;
}
}
JRB jrb_find_int(JRB n, int ikey)
{
int fnd;
JRB j;
j = jrb_find_gte_int(n, ikey, &fnd);
if (fnd) return j; else return NULL;
}
JRB jrb_find_gte_dbl(JRB n, double dkey, int *fnd)
{
*fnd = 0;
if (!ishead(n)) {
fprintf(stderr, "jrb_find_gte_dbl called on non-head %p\n", n);
exit(1);
}
if (n->parent == n) return n;
if (dkey == n->blink->key.d) {
*fnd = 1;
return n->blink;
}
if (dkey > n->blink->key.d) return n;
else n = n->parent;
while (1) {
if (isext(n)) return n;
if (dkey == getlext(n)->key.d) {
*fnd = 1;
return getlext(n);
}
n = (dkey < getlext(n)->key.d) ? n->flink : n->blink;
}
}
JRB jrb_find_dbl(JRB n, double dkey)
{
int fnd;
JRB j;
j = jrb_find_gte_dbl(n, dkey, &fnd);
if (fnd) return j; else return NULL;
}
JRB jrb_find_gte_gen(JRB n, Jval key,int (*fxn)(Jval, Jval), int *fnd)
{
int cmp;
*fnd = 0;
if (!ishead(n)) {
fprintf(stderr, "jrb_find_gte_str called on non-head %p\n", n);
exit(1);
}
if (n->parent == n) return n;
cmp = (*fxn)(key, n->blink->key);
if (cmp == 0) {
*fnd = 1;
return n->blink;
}
if (cmp > 0) return n;
else n = n->parent;
while (1) {
if (isext(n)) return n;
cmp = (*fxn)(key, getlext(n)->key);
if (cmp == 0) {
*fnd = 1;
return getlext(n);
}
if (cmp < 0) n = n->flink ; else n = n->blink;
}
}
JRB jrb_find_gen(JRB n, Jval key, int (*fxn)(Jval, Jval))
{
int fnd;
JRB j;
j = jrb_find_gte_gen(n, key, fxn, &fnd);
if (fnd) return j; else return NULL;
}
static JRB jrb_insert_b(JRB n, Jval key, Jval val)
{
JRB newleft, newright, newnode, p;
if (ishead(n)) {
if (n->parent == n) { /* Tree is empty */
mk_new_ext(newnode, key, val);
insert(newnode, n);
n->parent = newnode;
newnode->parent = n;
setroot(newnode);
return newnode;
} else {
mk_new_ext(newright, key, val);
insert(newright, n);
newleft = newright->blink;
setnormal(newleft);
mk_new_int(newleft, newright, newleft->parent, isleft(newleft));
p = rprev(newright);
if (!ishead(p)) setlext(p, newright);
return newright;
}
} else {
mk_new_ext(newleft, key, val);
insert(newleft, n);
setnormal(n);
mk_new_int(newleft, n, n->parent, isleft(n));
p = lprev(newleft);
if (!ishead(p)) setrext(p, newleft);
return newleft;
}
}
static void recolor(JRB n)
{
JRB p, gp, s;
int done = 0;
while(!done) {
if (isroot(n)) {
setblack(n);
return;
}
p = n->parent;
if (isblack(p)) return;
if (isroot(p)) {
setblack(p);
return;
}
gp = p->parent;
s = sibling(p);
if (isred(s)) {
setblack(p);
setred(gp);
setblack(s);
n = gp;
} else {
done = 1;
}
}
/* p's sibling is black, p is red, gp is black */
if ((isleft(n) == 0) == (isleft(p) == 0)) {
single_rotate(gp, isleft(n));
setblack(p);
setred(gp);
} else {
single_rotate(p, isleft(n));
single_rotate(gp, isleft(n));
setblack(n);
setred(gp);
}
}
static void single_rotate(JRB y, int l)
{
int rl = 0 /* for gcc */, ir;
JRB x, yp;
ir = isroot(y);
yp = y->parent;
if (!ir) {
rl = isleft(y);
}
if (l) {
x = y->flink;
y->flink = x->blink;
setleft(y->flink);
y->flink->parent = y;
x->blink = y;
setright(y);
} else {
x = y->blink;
y->blink = x->flink;
setright(y->blink);
y->blink->parent = y;
x->flink = y;
setleft(y);
}
x->parent = yp;
y->parent = x;
if (ir) {
yp->parent = x;
setnormal(y);
setroot(x);
} else {
if (rl) {
yp->flink = x;
setleft(x);
} else {
yp->blink = x;
setright(x);
}
}
}
void jrb_delete_node(JRB n)
{
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 (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;
/* 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);
}
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;
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);
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;
}
}
}
void jrb_print_tree(JRB t, int level)
{
int i;
if (ishead(t) && t->parent == t) {
printf("tree %p is empty\n", t);
} else if (ishead(t)) {
printf("Head: %p. Root = %p\n", t, t->parent);
jrb_print_tree(t->parent, 0);
} else {
if (isext(t)) {
for (i = 0; i < level; i++) putchar(' ');
printf("Ext node %p: %c,%c: p=%p, k=%s\n",
t, isred(t)?'R':'B', isleft(t)?'l':'r', t->parent, t->key.s);
} else {
jrb_print_tree(t->flink, level+2);
jrb_print_tree(t->blink, level+2);
for (i = 0; i < level; i++) putchar(' ');
printf("Int node %p: %c,%c: l=%p, r=%p, p=%p, lr=(%s,%s)\n",
t, isred(t)?'R':'B', isleft(t)?'l':'r', t->flink,
t->blink,
t->parent, getlext(t)->key.s, getrext(t)->key.s);
}
}
}
void jrb_iprint_tree(JRB t, int level)
{
int i;
if (ishead(t) && t->parent == t) {
printf("tree %p is empty\n", t);
} else if (ishead(t)) {
printf("Head: %p. Root = %p, < = %p, > = %p\n",
t, t->parent, t->blink, t->flink);
jrb_iprint_tree(t->parent, 0);
} else {
if (isext(t)) {
for (i = 0; i < level; i++) putchar(' ');
printf("Ext node %p: %c,%c: p=%p, <=%p, >=%p k=%d\n",
t, isred(t)?'R':'B', isleft(t)?'l':'r', t->parent,
t->blink, t->flink, t->key.i);
} else {
jrb_iprint_tree(t->flink, level+2);
jrb_iprint_tree(t->blink, level+2);
for (i = 0; i < level; i++) putchar(' ');
printf("Int node %p: %c,%c: l=%p, r=%p, p=%p, lr=(%d,%d)\n",
t, isred(t)?'R':'B', isleft(t)?'l':'r', t->flink,
t->blink,
t->parent, getlext(t)->key.i, getrext(t)->key.i);
}
}
}
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 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;
}
void jrb_free_tree(JRB n)
{
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);
}
Jval jrb_val(JRB n)
{
return n->val;
}
#if 0
static JRB jrb_insert_a(JRB nd, Jval key, Jval val)
{
return jrb_insert_b(nd->flink, key, val);
}
#endif
JRB jrb_insert_str(JRB tree, char *key, Jval val)
{
Jval k;
int fnd;
k.s = key;
return jrb_insert_b(jrb_find_gte_str(tree, key, &fnd), k, val);
}
JRB jrb_insert_int(JRB tree, int ikey, Jval val)
{
Jval k;
int fnd;
k.i = ikey;
return jrb_insert_b(jrb_find_gte_int(tree, ikey, &fnd), k, val);
}
JRB jrb_insert_dbl(JRB tree, double dkey, Jval val)
{
Jval k;
int fnd;
k.d = dkey;
return jrb_insert_b(jrb_find_gte_dbl(tree, dkey, &fnd), k, val);
}
JRB jrb_insert_gen(JRB tree, Jval key, Jval val,
int (*func)(Jval, Jval))
{
int fnd;
return jrb_insert_b(jrb_find_gte_gen(tree, key, func, &fnd), key, val);
}

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/*
Libraries for fields, doubly-linked lists and red-black trees.
Copyright (C) 2001 James S. Plank
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------
Please see http://www.cs.utk.edu/~plank/plank/classes/cs360/360/notes/Libfdr/
for instruction on how to use this library.
Jim Plank
plank@cs.utk.edu
http://www.cs.utk.edu/~plank
Associate Professor
Department of Computer Science
University of Tennessee
203 Claxton Complex
1122 Volunteer Blvd.
Knoxville, TN 37996-3450
865-974-4397
Fax: 865-974-4404
*/
#ifndef _JRB_H_
#define _JRB_H_
#include "jval.h"
/* Main jrb_node. You only ever use the fields
flink
blink
k.key or k.ikey
v.val
*/
typedef struct jrb_node {
unsigned char red;
unsigned char internal;
unsigned char left;
unsigned char roothead; /* (bit 1 is root, bit 2 is head) */
struct jrb_node *flink;
struct jrb_node *blink;
struct jrb_node *parent;
Jval key;
Jval val;
} *JRB;
extern JRB make_jrb(void); /* Creates a new rb-tree */
/* Creates a node with key key and val val and inserts it into the tree.
jrb_insert uses strcmp() as comparison funcion. jrb_inserti uses <>=,
jrb_insertg uses func() */
extern JRB jrb_insert_str(JRB tree, char *key, Jval val);
extern JRB jrb_insert_int(JRB tree, int ikey, Jval val);
extern JRB jrb_insert_dbl(JRB tree, double dkey, Jval val);
extern JRB jrb_insert_gen(JRB tree, Jval key, Jval val, int (*func)(Jval,Jval));
/* returns an external node in t whose value is equal k. Returns NULL if
there is no such node in the tree */
extern JRB jrb_find_str(JRB root, char *key);
extern JRB jrb_find_int(JRB root, int ikey);
extern JRB jrb_find_dbl(JRB root, double dkey);
extern JRB jrb_find_gen(JRB root, Jval, int (*func)(Jval, Jval));
/* returns an external node in t whose value is equal
k or whose value is the smallest value greater than k. Sets found to
1 if the key was found, and 0 otherwise. */
extern JRB jrb_find_gte_str(JRB root, char *key, int *found);
extern JRB jrb_find_gte_int(JRB root, int ikey, int *found);
extern JRB jrb_find_gte_dbl(JRB root, double dkey, int *found);
extern JRB jrb_find_gte_gen(JRB root, Jval key,
int (*func)(Jval, Jval), int *found);
/* Creates a node with key key and val val and inserts it into the
tree before/after node nd. Does not check to ensure that you are
keeping the correct order */
extern void jrb_delete_node(JRB node); /* Deletes and frees a node (but
not the key or val) */
extern void jrb_free_tree(JRB root); /* Deletes and frees an entire tree */
extern Jval jrb_val(JRB node); /* Returns node->v.val -- this is to shut
lint up */
extern int jrb_nblack(JRB n); /* returns # of black nodes in path from
n to the root */
int jrb_plength(JRB n); /* returns the # of nodes in path from
n to the root */
#define jrb_first(n) ((n)->flink)
#define jrb_last(n) ((n)->blink)
#define jrb_next(n) ((n)->flink)
#define jrb_prev(n) ((n)->blink)
#define jrb_empty(t) ((t)->flink == (t))
#ifndef jrb_nil
#define jrb_nil(t) (t)
#endif
#define jrb_traverse(ptr, lst) \
for(ptr = jrb_first(lst); ptr != jrb_nil(lst); ptr = jrb_next(ptr))
#define jrb_rtraverse(ptr, lst) \
for(ptr = jrb_last(lst); ptr != jrb_nil(lst); ptr = jrb_prev(ptr))
#endif

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/*
Libraries for fields, doubly-linked lists and red-black trees.
Copyright (C) 2001 James S. Plank
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------
Please see http://www.cs.utk.edu/~plank/plank/classes/cs360/360/notes/Libfdr/
for instruction on how to use this library.
Jim Plank
plank@cs.utk.edu
http://www.cs.utk.edu/~plank
Associate Professor
Department of Computer Science
University of Tennessee
203 Claxton Complex
1122 Volunteer Blvd.
Knoxville, TN 37996-3450
865-974-4397
Fax: 865-974-4404
*/
#include <stdio.h>
#include <string.h>
#include "jval.h"
Jval JNULL;
Jval new_jval_i(int i) {
Jval j;
j.i = i;
return j;
}
Jval new_jval_l(long l) {
Jval j;
j.l = l;
return j;
}
Jval new_jval_f(float f) {
Jval j;
j.f = f;
return j;
}
Jval new_jval_d(double d) {
Jval j;
j.d = d;
return j;
}
Jval new_jval_v(void *v) {
Jval j;
j.v = v;
return j;
}
Jval new_jval_s(char *s) {
Jval j;
j.s = s;
return j;
}
Jval new_jval_c(char c) {
Jval j;
j.c = c;
return j;
}
Jval new_jval_uc(unsigned char uc) {
Jval j;
j.uc = uc;
return j;
}
Jval new_jval_sh(short sh) {
Jval j;
j.sh = sh;
return j;
}
Jval new_jval_ush(unsigned short ush) {
Jval j;
j.ush = ush;
return j;
}
Jval new_jval_ui(unsigned int i) {
Jval j;
j.i = i;
return j;
}
Jval new_jval_iarray(int i0, int i1) {
Jval j;
j.iarray[0] = i0;
j.iarray[1] = i1;
return j;
}
Jval new_jval_farray(float f0, float f1) {
Jval j;
j.farray[0] = f0;
j.farray[1] = f1;
return j;
}
Jval new_jval_carray_nt(char *carray) {
Jval j;
int i;
for (i = 0; i < 8 && carray[i] != '\0'; i++) {
j.carray[i] = carray[i];
}
if (i < 8) j.carray[i] = carray[i];
return j;
}
Jval new_jval_carray_nnt(char *carray) {
Jval j;
memcpy(j.carray, carray, 8);
return j;
}
int jval_i(Jval j) {
return j.i;
}
long jval_l(Jval j) {
return j.l;
}
float jval_f(Jval j) {
return j.f;
}
double jval_d(Jval j) {
return j.d;
}
void *jval_v(Jval j) {
return j.v;
}
char *jval_s(Jval j) {
return j.s;
}
char jval_c(Jval j) {
return j.c;
}
unsigned char jval_uc(Jval j) {
return j.uc;
}
short jval_sh(Jval j) {
return j.sh;
}
unsigned short jval_ush(Jval j) {
return j.ush;
}
unsigned int jval_ui(Jval j) {
return j.ui;
}
int *jval_iarray(Jval j) {
return j.iarray;
}
float *jval_farray(Jval j) {
return j.farray;
}
char *jval_carray(Jval j) {
return j.carray;
}

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/*
Libraries for fields, doubly-linked lists and red-black trees.
Copyright (C) 2001 James S. Plank
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
---------------------------------------------------------------------------
Please see http://www.cs.utk.edu/~plank/plank/classes/cs360/360/notes/Libfdr/
for instruction on how to use this library.
Jim Plank
plank@cs.utk.edu
http://www.cs.utk.edu/~plank
Associate Professor
Department of Computer Science
University of Tennessee
203 Claxton Complex
1122 Volunteer Blvd.
Knoxville, TN 37996-3450
865-974-4397
Fax: 865-974-4404
*/
#ifndef _JVAL_H_
#define _JVAL_H_
/* The Jval -- a type that can hold any 8-byte type */
typedef union {
int i;
long l;
float f;
double d;
void *v;
char *s;
char c;
unsigned char uc;
short sh;
unsigned short ush;
unsigned int ui;
int iarray[2];
float farray[2];
char carray[8];
unsigned char ucarray[8];
} Jval;
extern Jval new_jval_i(int);
extern Jval new_jval_l(long);
extern Jval new_jval_f(float);
extern Jval new_jval_d(double);
extern Jval new_jval_v(void *);
extern Jval new_jval_s(char *);
extern Jval new_jval_c(char);
extern Jval new_jval_uc(unsigned char);
extern Jval new_jval_sh(short);
extern Jval new_jval_ush(unsigned short);
extern Jval new_jval_ui(unsigned int);
extern Jval new_jval_iarray(int, int);
extern Jval new_jval_farray(float, float);
extern Jval new_jval_carray_nt(char *); /* Carray is null terminated */
extern Jval new_jval_carray_nnt(char *); /* Carray is not null terminated */
/* For ucarray -- use carray, because it uses memcpy */
extern Jval JNULL;
extern int jval_i(Jval);
extern long jval_l(Jval);
extern float jval_f(Jval);
extern double jval_d(Jval);
extern void *jval_v(Jval);
extern char *jval_s(Jval);
extern char jval_c(Jval);
extern unsigned char jval_uc(Jval);
extern short jval_sh(Jval);
extern unsigned short jval_ush(Jval);
extern unsigned int jval_ui(Jval);
extern int *jval_iarray(Jval);
extern float *jval_farray(Jval);
extern char *jval_carray(Jval);
#endif