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authorcvs2git <rtems-devel@rtems.org>2004-10-18 18:12:41 +0000
committercvs2git <rtems-devel@rtems.org>2004-10-18 18:12:41 +0000
commit22da040d92279fccfb52be0dfd7c31c002f0e6be (patch)
tree5d8d7914192c1c17146306a75c9ae9be90c4a5a6 /avl-1.4.0/rb.c
parent66d25567fe424bb55fde088f3d45e9ed044400c1 (diff)
This commit was manufactured by cvs2svn to create tag 'rtems-addon-rtems-addon-packages-4-6-2
packages-4-6-2'. Sprout from ncurses-gnu 2002-12-19 15:34:54 UTC Eric Norum <WENorum@lbl.gov> 'Latest ncurses add-on' Cherrypick from addons 2002-06-28 21:58:41 UTC Eric Norum <WENorum@lbl.gov> 'Useful add-on libraries': README RTEMS_Makefiles/Makefile.avl RTEMS_Makefiles/Makefile.common RTEMS_Makefiles/Makefile.site avl-1.4.0/AUTHORS avl-1.4.0/COPYING avl-1.4.0/ChangeLog avl-1.4.0/INSTALL avl-1.4.0/Makefile.am avl-1.4.0/Makefile.in avl-1.4.0/NEWS avl-1.4.0/README avl-1.4.0/THANKS avl-1.4.0/TODO avl-1.4.0/aclocal.m4 avl-1.4.0/avl.c avl-1.4.0/avl.h avl-1.4.0/avl.html avl-1.4.0/avl.info avl-1.4.0/avl.texinfo avl-1.4.0/avl.text avl-1.4.0/avlt.c avl-1.4.0/avlt.h avl-1.4.0/avltr.c avl-1.4.0/avltr.h avl-1.4.0/configure avl-1.4.0/configure.in avl-1.4.0/install-sh avl-1.4.0/missing avl-1.4.0/mkinstalldirs avl-1.4.0/rb.c avl-1.4.0/rb.h avl-1.4.0/texinfo.tex avl-1.4.0/thread-test.c examples/avl/BuildTests.sh examples/avl/Makefile examples/avl/README examples/avl/init.c examples/ncurses/BuildTests.sh 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ncurses-5.2/ncurses/tinfo/lib_acs.c ncurses-5.2/ncurses/tinfo/lib_baudrate.c ncurses-5.2/ncurses/tinfo/lib_cur_term.c ncurses-5.2/ncurses/tinfo/lib_data.c ncurses-5.2/ncurses/tinfo/lib_has_cap.c ncurses-5.2/ncurses/tinfo/lib_kernel.c ncurses-5.2/ncurses/tinfo/lib_longname.c ncurses-5.2/ncurses/tinfo/lib_napms.c ncurses-5.2/ncurses/tinfo/lib_options.c ncurses-5.2/ncurses/tinfo/lib_print.c ncurses-5.2/ncurses/tinfo/lib_raw.c ncurses-5.2/ncurses/tinfo/lib_setup.c ncurses-5.2/ncurses/tinfo/lib_termcap.c ncurses-5.2/ncurses/tinfo/lib_termname.c ncurses-5.2/ncurses/tinfo/lib_tgoto.c ncurses-5.2/ncurses/tinfo/lib_ti.c ncurses-5.2/ncurses/tinfo/lib_tparm.c ncurses-5.2/ncurses/tinfo/lib_tputs.c ncurses-5.2/ncurses/tinfo/lib_ttyflags.c ncurses-5.2/ncurses/tinfo/make_keys.c ncurses-5.2/ncurses/tinfo/name_match.c ncurses-5.2/ncurses/tinfo/parse_entry.c ncurses-5.2/ncurses/tinfo/read_entry.c ncurses-5.2/ncurses/tinfo/read_termcap.c ncurses-5.2/ncurses/tinfo/setbuf.c ncurses-5.2/ncurses/tinfo/strings.c ncurses-5.2/ncurses/tinfo/write_entry.c ncurses-5.2/ncurses/trace/README ncurses-5.2/ncurses/trace/lib_trace.c ncurses-5.2/ncurses/trace/lib_traceatr.c ncurses-5.2/ncurses/trace/lib_tracebits.c ncurses-5.2/ncurses/trace/lib_tracechr.c ncurses-5.2/ncurses/trace/lib_tracedmp.c ncurses-5.2/ncurses/trace/lib_tracemse.c ncurses-5.2/ncurses/trace/trace_buf.c ncurses-5.2/ncurses/trace/trace_tries.c ncurses-5.2/ncurses/trace/trace_xnames.c ncurses-5.2/ncurses/tty/MKexpanded.sh ncurses-5.2/ncurses/tty/hardscroll.c ncurses-5.2/ncurses/tty/hashmap.c ncurses-5.2/ncurses/tty/lib_mvcur.c ncurses-5.2/ncurses/tty/lib_tstp.c ncurses-5.2/ncurses/tty/lib_twait.c ncurses-5.2/ncurses/tty/lib_vidattr.c ncurses-5.2/ncurses/tty/tty_display.h ncurses-5.2/ncurses/tty/tty_input.h ncurses-5.2/ncurses/tty/tty_update.c ncurses-5.2/panel/Makefile.in ncurses-5.2/panel/headers ncurses-5.2/panel/llib-lpanel ncurses-5.2/panel/modules ncurses-5.2/panel/p_above.c ncurses-5.2/panel/p_below.c ncurses-5.2/panel/p_bottom.c ncurses-5.2/panel/p_delete.c ncurses-5.2/panel/p_hidden.c ncurses-5.2/panel/p_hide.c ncurses-5.2/panel/p_move.c ncurses-5.2/panel/p_new.c ncurses-5.2/panel/p_replace.c ncurses-5.2/panel/p_show.c ncurses-5.2/panel/p_top.c ncurses-5.2/panel/p_update.c ncurses-5.2/panel/p_user.c ncurses-5.2/panel/p_win.c ncurses-5.2/panel/panel.c ncurses-5.2/panel/panel.h ncurses-5.2/panel/panel.priv.h ncurses-5.2/progs/MKtermsort.sh ncurses-5.2/progs/Makefile.in ncurses-5.2/progs/capconvert ncurses-5.2/progs/clear.c ncurses-5.2/progs/clear.sh ncurses-5.2/progs/dump_entry.c ncurses-5.2/progs/dump_entry.h ncurses-5.2/progs/infocmp.c ncurses-5.2/progs/modules ncurses-5.2/progs/progs.priv.h ncurses-5.2/progs/tic.c ncurses-5.2/progs/toe.c ncurses-5.2/progs/tput.c ncurses-5.2/progs/tset.c ncurses-5.2/sysdeps/unix/sysv/linux/Makefile ncurses-5.2/sysdeps/unix/sysv/linux/alpha/configure ncurses-5.2/sysdeps/unix/sysv/linux/configure ncurses-5.2/sysdeps/unix/sysv/linux/edit_man.sed ncurses-5.2/sysdeps/unix/sysv/linux/edit_man.sh ncurses-5.2/sysdeps/unix/sysv/linux/run_tic.sh ncurses-5.2/tack/COPYING ncurses-5.2/tack/HISTORY ncurses-5.2/tack/Makefile.in ncurses-5.2/tack/README ncurses-5.2/tack/ansi.c ncurses-5.2/tack/charset.c ncurses-5.2/tack/color.c ncurses-5.2/tack/control.c ncurses-5.2/tack/crum.c ncurses-5.2/tack/edit.c ncurses-5.2/tack/fun.c ncurses-5.2/tack/init.c ncurses-5.2/tack/menu.c ncurses-5.2/tack/modes.c ncurses-5.2/tack/modules ncurses-5.2/tack/output.c ncurses-5.2/tack/pad.c ncurses-5.2/tack/scan.c ncurses-5.2/tack/sync.c ncurses-5.2/tack/sysdep.c ncurses-5.2/tack/tack.1 ncurses-5.2/tack/tack.c ncurses-5.2/tack/tack.h ncurses-5.2/tar-copy.sh ncurses-5.2/test/Makefile.in ncurses-5.2/test/README ncurses-5.2/test/blue.c ncurses-5.2/test/bs.6 ncurses-5.2/test/bs.c ncurses-5.2/test/cardfile.c ncurses-5.2/test/cardfile.dat ncurses-5.2/test/configure ncurses-5.2/test/configure.in ncurses-5.2/test/ditto.c ncurses-5.2/test/dots.c ncurses-5.2/test/filter.c ncurses-5.2/test/firework.c ncurses-5.2/test/firstlast.c ncurses-5.2/test/gdc.6 ncurses-5.2/test/gdc.c ncurses-5.2/test/hanoi.c ncurses-5.2/test/hashtest.c ncurses-5.2/test/keynames.c ncurses-5.2/test/knight.c ncurses-5.2/test/lrtest.c ncurses-5.2/test/modules ncurses-5.2/test/ncurses.c ncurses-5.2/test/ncurses_tst.hin ncurses-5.2/test/newdemo.c ncurses-5.2/test/railroad.c ncurses-5.2/test/rain.c ncurses-5.2/test/tclock.c ncurses-5.2/test/test.priv.h ncurses-5.2/test/testaddch.c ncurses-5.2/test/testcurs.c ncurses-5.2/test/testscanw.c ncurses-5.2/test/tracemunch ncurses-5.2/test/view.c ncurses-5.2/test/worm.c ncurses-5.2/test/xmas.c Cherrypick from master 2004-10-18 18:12:40 UTC Joel Sherrill <joel.sherrill@OARcorp.com> '2004-10-18 Joel Sherrill <joel@OARcorp.com>': ChangeLog RTEMS_Makefiles/Makefile.bfd RTEMS_Makefiles/Makefile.libtecla RTEMS_Makefiles/Makefile.ncurses RTEMS_Makefiles/Makefile.ncurses-5.3 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readline-4.3/complete.c readline-4.3/config.h.in readline-4.3/configure readline-4.3/configure.in readline-4.3/display.c readline-4.3/doc/Makefile.in readline-4.3/doc/hist.texinfo readline-4.3/doc/history.3 readline-4.3/doc/hstech.texinfo readline-4.3/doc/hsuser.texinfo readline-4.3/doc/manvers.texinfo readline-4.3/doc/readline.3 readline-4.3/doc/rlman.texinfo readline-4.3/doc/rltech.texinfo readline-4.3/doc/rluser.texinfo readline-4.3/doc/rluserman.texinfo readline-4.3/doc/texi2dvi readline-4.3/doc/texi2html readline-4.3/doc/texinfo.tex readline-4.3/emacs_keymap.c readline-4.3/examples/Inputrc readline-4.3/examples/Makefile.in readline-4.3/examples/excallback.c readline-4.3/examples/fileman.c readline-4.3/examples/histexamp.c readline-4.3/examples/manexamp.c readline-4.3/examples/readlinebuf.h readline-4.3/examples/rl.c readline-4.3/examples/rlcat.c readline-4.3/examples/rlfe.c readline-4.3/examples/rltest.c readline-4.3/examples/rlversion.c readline-4.3/funmap.c readline-4.3/histexpand.c readline-4.3/histfile.c readline-4.3/histlib.h readline-4.3/history.c readline-4.3/history.h readline-4.3/histsearch.c readline-4.3/input.c readline-4.3/isearch.c readline-4.3/keymaps.c readline-4.3/keymaps.h readline-4.3/kill.c readline-4.3/macro.c readline-4.3/mbutil.c readline-4.3/misc.c readline-4.3/nls.c readline-4.3/parens.c readline-4.3/posixdir.h readline-4.3/posixjmp.h readline-4.3/posixstat.h readline-4.3/readline.c readline-4.3/readline.h readline-4.3/rlconf.h readline-4.3/rldefs.h readline-4.3/rlmbutil.h readline-4.3/rlprivate.h readline-4.3/rlshell.h readline-4.3/rlstdc.h readline-4.3/rltty.c readline-4.3/rltty.h readline-4.3/rltypedefs.h readline-4.3/rlwinsize.h readline-4.3/savestring.c readline-4.3/search.c readline-4.3/shell.c readline-4.3/shlib/Makefile.in readline-4.3/signals.c readline-4.3/support/config.guess readline-4.3/support/config.sub readline-4.3/support/install.sh readline-4.3/support/mkdirs readline-4.3/support/mkdist readline-4.3/support/shlib-install readline-4.3/support/shobj-conf readline-4.3/support/wcwidth.c readline-4.3/tcap.h readline-4.3/terminal.c readline-4.3/text.c readline-4.3/tilde.c readline-4.3/tilde.h readline-4.3/undo.c readline-4.3/util.c readline-4.3/vi_keymap.c readline-4.3/vi_mode.c readline-4.3/xmalloc.c readline-4.3/xmalloc.h readline-doc-4.3/MANIFEST.doc readline-doc-4.3/doc/history.0 readline-doc-4.3/doc/history.dvi readline-doc-4.3/doc/history.html readline-doc-4.3/doc/history.info readline-doc-4.3/doc/history.ps readline-doc-4.3/doc/history_3.ps readline-doc-4.3/doc/readline.0 readline-doc-4.3/doc/readline.dvi readline-doc-4.3/doc/readline.html readline-doc-4.3/doc/readline.info readline-doc-4.3/doc/readline.ps readline-doc-4.3/doc/readline_3.ps readline-doc-4.3/doc/rluserman.dvi readline-doc-4.3/doc/rluserman.html readline-doc-4.3/doc/rluserman.info readline-doc-4.3/doc/rluserman.ps rtemsNfs-1.1/ChangeLog rtemsNfs-1.1/LICENSE rtemsNfs-1.1/Makefile rtemsNfs-1.1/README 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zlib-1.1.4/contrib/asm386/zlibvc.dsw zlib-1.1.4/contrib/asm586/README.586 zlib-1.1.4/contrib/asm586/match.S zlib-1.1.4/contrib/asm686/README.686 zlib-1.1.4/contrib/asm686/match.S zlib-1.1.4/contrib/delphi/zlib.mak zlib-1.1.4/contrib/delphi/zlibdef.pas zlib-1.1.4/contrib/delphi2/d_zlib.bpr zlib-1.1.4/contrib/delphi2/d_zlib.cpp zlib-1.1.4/contrib/delphi2/readme.txt zlib-1.1.4/contrib/delphi2/zlib.bpg zlib-1.1.4/contrib/delphi2/zlib.bpr zlib-1.1.4/contrib/delphi2/zlib.cpp zlib-1.1.4/contrib/delphi2/zlib.pas zlib-1.1.4/contrib/delphi2/zlib32.bpr zlib-1.1.4/contrib/delphi2/zlib32.cpp zlib-1.1.4/contrib/iostream/test.cpp zlib-1.1.4/contrib/iostream/zfstream.cpp zlib-1.1.4/contrib/iostream/zfstream.h zlib-1.1.4/contrib/iostream2/zstream.h zlib-1.1.4/contrib/iostream2/zstream_test.cpp zlib-1.1.4/contrib/minizip/ChangeLogUnzip zlib-1.1.4/contrib/minizip/Makefile zlib-1.1.4/contrib/minizip/miniunz.c zlib-1.1.4/contrib/minizip/minizip.c zlib-1.1.4/contrib/minizip/readme.txt zlib-1.1.4/contrib/minizip/unzip.c zlib-1.1.4/contrib/minizip/unzip.def zlib-1.1.4/contrib/minizip/unzip.h zlib-1.1.4/contrib/minizip/zip.c zlib-1.1.4/contrib/minizip/zip.def zlib-1.1.4/contrib/minizip/zip.h zlib-1.1.4/contrib/minizip/zlibvc.def zlib-1.1.4/contrib/minizip/zlibvc.dsp zlib-1.1.4/contrib/minizip/zlibvc.dsw zlib-1.1.4/contrib/untgz/Makefile zlib-1.1.4/contrib/untgz/makefile.w32 zlib-1.1.4/contrib/untgz/untgz.c zlib-1.1.4/contrib/visual-basic.txt zlib-1.1.4/crc32.c zlib-1.1.4/deflate.c zlib-1.1.4/deflate.h zlib-1.1.4/descrip.mms zlib-1.1.4/example.c zlib-1.1.4/gzio.c zlib-1.1.4/infblock.c zlib-1.1.4/infblock.h zlib-1.1.4/infcodes.c zlib-1.1.4/infcodes.h zlib-1.1.4/inffast.c zlib-1.1.4/inffast.h zlib-1.1.4/inffixed.h zlib-1.1.4/inflate.c zlib-1.1.4/inftrees.c zlib-1.1.4/inftrees.h zlib-1.1.4/infutil.c zlib-1.1.4/infutil.h zlib-1.1.4/maketree.c zlib-1.1.4/minigzip.c zlib-1.1.4/msdos/Makefile.b32 zlib-1.1.4/msdos/Makefile.bor zlib-1.1.4/msdos/Makefile.dj2 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Diffstat (limited to 'avl-1.4.0/rb.c')
-rw-r--r--avl-1.4.0/rb.c1083
1 files changed, 1083 insertions, 0 deletions
diff --git a/avl-1.4.0/rb.c b/avl-1.4.0/rb.c
new file mode 100644
index 0000000..b0ec05d
--- /dev/null
+++ b/avl-1.4.0/rb.c
@@ -0,0 +1,1083 @@
+/* libavl - manipulates AVL trees.
+ Copyright (C) 1998, 1999 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ This program 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA.
+
+ The author may be contacted at <pfaffben@pilot.msu.edu> on the
+ Internet, or as Ben Pfaff, 12167 Airport Rd, DeWitt MI 48820, USA
+ through more mundane means. */
+
+/* This is file rb.c in libavl. */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+#if SELF_TEST
+#include <limits.h>
+#include <time.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "rb.h"
+
+#if !PSPP && !__GCC__
+#define inline
+#endif
+
+#if __GNUC__ >= 2
+#define unused __attribute__ ((unused))
+#else
+#define unused
+#endif
+
+#ifdef HAVE_XMALLOC
+void *xmalloc (size_t);
+#else /* !HAVE_XMALLOC */
+/* Allocates SIZE bytes of space using malloc(). Aborts if out of
+ memory. */
+static void *
+xmalloc (size_t size)
+{
+ void *vp;
+
+ if (size == 0)
+ return NULL;
+ vp = malloc (size);
+
+ assert (vp != NULL);
+ if (vp == NULL)
+ {
+ fprintf (stderr, "virtual memory exhausted\n");
+ exit (EXIT_FAILURE);
+ }
+ return vp;
+}
+#endif /* !HAVE_XMALLOC */
+
+/* Creates a red-black tree in arena OWNER (which can be NULL). The
+ arena is owned by the caller, not by the red-black tree. CMP is a
+ order function for the data to be stored in the tree. PARAM is
+ arbitrary data that becomes an argument to the comparison
+ function. */
+rb_tree *
+rb_create (MAYBE_ARENA avl_comparison_func cmp, void *param)
+{
+ rb_tree *tree;
+
+ assert (cmp != NULL);
+ tree = xmalloc (sizeof (rb_tree));
+
+ tree->root.link[0] = NULL;
+ tree->root.link[1] = NULL;
+ tree->cmp = cmp;
+ tree->count = 0;
+ tree->param = param;
+
+ return tree;
+}
+
+/* Destroy tree TREE. Function FREE_FUNC is called for every node in
+ the tree as it is destroyed.
+
+ No effect if the tree has an arena owner and free_func is NULL.
+ The caller owns the arena and must destroy it itself.
+
+ Do not attempt to reuse the tree after it has been freed. Create a
+ new one. */
+void
+rb_destroy (rb_tree *tree, avl_node_func free_func)
+{
+ assert (tree != NULL);
+
+ {
+ /* Uses Knuth's Algorithm 2.3.1T as modified in exercise 13
+ (postorder traversal). */
+
+ /* T1. */
+ rb_node *an[RB_MAX_HEIGHT]; /* Stack A: nodes. */
+ unsigned long ab = 0; /* Stack A: bits. */
+ int ap = 0; /* Stack A: height. */
+ rb_node *p = tree->root.link[0];
+
+ for (;;)
+ {
+ /* T2. */
+ while (p != NULL)
+ {
+ /* T3. */
+ ab &= ~(1ul << ap);
+ an[ap++] = p;
+ p = p->link[0];
+ }
+
+ /* T4. */
+ for (;;)
+ {
+ if (ap == 0)
+ goto done;
+
+ p = an[--ap];
+ if ((ab & (1ul << ap)) == 0)
+ {
+ ab |= (1ul << ap++);
+ p = p->link[1];
+ break;
+ }
+
+ if (free_func)
+ free_func (p->data, tree->param);
+ free (p);
+ }
+ }
+ }
+
+ done:
+ free (tree);
+}
+
+/* rb_destroy() with FREE_FUNC hardcoded as free(). */
+void
+rb_free (rb_tree *tree)
+{
+ rb_destroy (tree, (avl_node_func) free);
+}
+
+/* Return the number of nodes in TREE. */
+int
+rb_count (const rb_tree *tree)
+{
+ assert (tree != NULL);
+ return tree->count;
+}
+
+/* Copy the contents of TREE to a new tree in arena OWNER. If COPY is
+ non-NULL, then each data item is passed to function COPY, and the
+ return values are inserted into the new tree; otherwise, the items
+ are copied verbatim from the old tree to the new tree. Returns the
+ new tree. */
+rb_tree *
+rb_copy (MAYBE_ARENA const rb_tree *tree, avl_copy_func copy)
+{
+ /* This is a combination of Knuth's Algorithm 2.3.1C (copying a
+ binary tree) and Algorithm 2.3.1T as modified by exercise 12
+ (preorder traversal). */
+
+ rb_tree *new_tree;
+
+ /* PT1. */
+ const rb_node *pa[RB_MAX_HEIGHT]; /* Stack PA: nodes. */
+ const rb_node **pp = pa; /* Stack PA: stack pointer. */
+ const rb_node *p = &tree->root;
+
+ /* QT1. */
+ rb_node *qa[RB_MAX_HEIGHT]; /* Stack QA: nodes. */
+ rb_node **qp = qa; /* Stack QA: stack pointer. */
+ rb_node *q;
+
+ assert (tree != NULL);
+ new_tree = rb_create (tree->cmp, tree->param);
+ new_tree->count = tree->count;
+ q = &new_tree->root;
+
+ for (;;)
+ {
+ /* C4. */
+ if (p->link[0] != NULL)
+ {
+ rb_node *r = xmalloc (sizeof (rb_node));
+ r->link[0] = r->link[1] = NULL;
+ q->link[0] = r;
+ }
+
+ /* C5: Find preorder successors of P and Q. */
+ goto start;
+ for (;;)
+ {
+ /* PT2. */
+ while (p != NULL)
+ {
+ goto escape;
+ start:
+ /* PT3. */
+ *pp++ = p;
+ *qp++ = q;
+ p = p->link[0];
+ q = q->link[0];
+ }
+
+ /* PT4. */
+ if (pp == pa)
+ {
+ assert (qp == qa);
+ return new_tree;
+ }
+
+ p = *--pp;
+ q = *--qp;
+
+ /* PT5. */
+ p = p->link[1];
+ q = q->link[1];
+ }
+ escape:
+
+ /* C2. */
+ if (p->link[1])
+ {
+ rb_node *r = xmalloc (sizeof (rb_node));
+ r->link[0] = r->link[1] = NULL;
+ q->link[1] = r;
+ }
+
+ /* C3. */
+ q->color = p->color;
+ if (copy == NULL)
+ q->data = p->data;
+ else
+ q->data = copy (p->data, tree->param);
+ }
+}
+
+/* Walk tree TREE in inorder, calling WALK_FUNC at each node. Passes
+ PARAM to WALK_FUNC. */
+void
+rb_walk (const rb_tree *tree, avl_node_func walk_func, void *param)
+{
+ /* Uses Knuth's algorithm 2.3.1T (inorder traversal). */
+ assert (tree && walk_func);
+
+ {
+ /* T1. */
+ const rb_node *an[RB_MAX_HEIGHT]; /* Stack A: nodes. */
+ const rb_node **ap = an; /* Stack A: stack pointer. */
+ const rb_node *p = tree->root.link[0];
+
+ for (;;)
+ {
+ /* T2. */
+ while (p != NULL)
+ {
+ /* T3. */
+ *ap++ = p;
+ p = p->link[0];
+ }
+
+ /* T4. */
+ if (ap == an)
+ return;
+ p = *--ap;
+
+ /* T5. */
+ walk_func (p->data, param);
+ p = p->link[1];
+ }
+ }
+}
+
+/* Each call to this function for a given TREE and TRAV return the
+ next item in the tree in inorder. Initialize the first element of
+ TRAV (init) to 0 before calling the first time. Returns NULL when
+ out of elements. */
+void *
+rb_traverse (const rb_tree *tree, rb_traverser *trav)
+{
+ assert (tree && trav);
+
+ /* Uses Knuth's algorithm 2.3.1T (inorder traversal). */
+ if (trav->init == 0)
+ {
+ /* T1. */
+ trav->init = 1;
+ trav->nstack = 0;
+ trav->p = tree->root.link[0];
+ }
+ else
+ /* T5. */
+ trav->p = trav->p->link[1];
+
+ for (;;)
+ {
+ /* T2. */
+ while (trav->p != NULL)
+ {
+ /* T3. */
+ trav->stack[trav->nstack++] = trav->p;
+ trav->p = trav->p->link[0];
+ }
+
+ /* T4. */
+ if (trav->nstack == 0)
+ {
+ trav->init = 0;
+ return NULL;
+ }
+ trav->p = trav->stack[--trav->nstack];
+
+ /* T5. */
+ return trav->p->data;
+ }
+}
+
+/* Search TREE for an item matching ITEM. If found, returns a pointer
+ to the address of the item. If none is found, ITEM is inserted
+ into the tree, and a pointer to the address of ITEM is returned.
+ In either case, the pointer returned can be changed by the caller,
+ or the returned data item can be directly edited, but the key data
+ in the item must not be changed. */
+void **
+rb_probe (rb_tree *tree, void *item)
+{
+ /* Algorithm based on RB-Insert from section 14.3 of _Introduction
+ to Algorithms_, Cormen et al., MIT Press 1990, ISBN
+ 0-262-03141-8. */
+
+ rb_node *ap[RB_MAX_HEIGHT]; /* Stack A: Nodes. */
+ char ad[RB_MAX_HEIGHT]; /* Stack A: Directions. */
+ int ak = 1; /* Stack A: Pointer. */
+
+ rb_node *t, *x, *y, *n;
+
+ assert (tree != NULL);
+ t = &tree->root;
+ x = t->link[0];
+
+ if (x == NULL)
+ {
+ tree->count++;
+ assert (tree->count == 1);
+ x = t->link[0] = xmalloc (sizeof (rb_node));
+ x->data = item;
+ x->link[0] = x->link[1] = NULL;
+ x->color = RB_BLACK;
+ return &x->data;
+ }
+
+ ad[0] = 0;
+ ap[0] = &tree->root;
+
+ for (;;)
+ {
+ int diff = tree->cmp (item, x->data, tree->param);
+
+ if (diff < 0)
+ {
+ ap[ak] = x;
+ ad[ak++] = 0;
+ y = x->link[0];
+ if (y == NULL)
+ {
+ n = x = x->link[0] = xmalloc (sizeof (rb_node));
+ break;
+ }
+ }
+ else if (diff > 0)
+ {
+ ap[ak] = x;
+ ad[ak++] = 1;
+ y = x->link[1];
+ if (y == NULL)
+ {
+ n = x = x->link[1] = xmalloc (sizeof (rb_node));
+ break;
+ }
+ }
+ else
+ return &x->data;
+
+ x = y;
+ }
+
+ tree->count++;
+ x->data = item;
+ x->link[0] = x->link[1] = NULL;
+ x->color = RB_RED;
+
+ for (;;)
+ {
+ if (ak < 3 || ap[ak - 1]->color != RB_RED)
+ break;
+
+ if (ad[ak - 2] == 0)
+ {
+ y = ap[ak - 2]->link[1];
+ if (y != NULL && y->color == RB_RED)
+ {
+ /* Case 1. */
+ ap[ak - 1]->color = y->color = RB_BLACK;
+ ap[ak - 2]->color = RB_RED;
+ ak -= 2;
+ }
+ else
+ {
+ if (ad[ak - 1] == 1)
+ {
+ /* Case 2. */
+ x = ap[ak - 1];
+ y = x->link[1];
+ x->link[1] = y->link[0];
+ y->link[0] = x;
+ ap[ak - 2]->link[0] = y;
+ }
+ else
+ y = ap[ak - 1];
+
+ /* Case 3. */
+ x = ap[ak - 2];
+ x->color = RB_RED;
+ y->color = RB_BLACK;
+
+ x->link[0] = y->link[1];
+ y->link[1] = x;
+ ap[ak - 3]->link[(int) ad[ak - 3]] = y;
+
+ break;
+ }
+ }
+ else
+ {
+ y = ap[ak - 2]->link[0];
+ if (y != NULL && y->color == RB_RED)
+ {
+ /* Case 1. */
+ ap[ak - 1]->color = y->color = RB_BLACK;
+ ap[ak - 2]->color = RB_RED;
+ ak -= 2;
+ }
+ else
+ {
+ if (ad[ak - 1] == 0)
+ {
+ /* Case 2. */
+ x = ap[ak - 1];
+ y = x->link[0];
+ x->link[0] = y->link[1];
+ y->link[1] = x;
+ ap[ak - 2]->link[1] = y;
+ }
+ else
+ y = ap[ak - 1];
+
+ /* Case 3. */
+ x = ap[ak - 2];
+ x->color = RB_RED;
+ y->color = RB_BLACK;
+
+ x->link[1] = y->link[0];
+ y->link[0] = x;
+ ap[ak - 3]->link[(int) ad[ak - 3]] = y;
+ break;
+ }
+ }
+ }
+
+ tree->root.link[0]->color = RB_BLACK;
+
+ return &n->data;
+}
+
+/* Search TREE for an item matching ITEM, and return it if found. */
+void *
+rb_find (const rb_tree *tree, const void *item)
+{
+ const rb_node *p;
+
+ assert (tree != NULL);
+ for (p = tree->root.link[0]; p; )
+ {
+ int diff = tree->cmp (item, p->data, tree->param);
+
+ if (diff < 0)
+ p = p->link[0];
+ else if (diff > 0)
+ p = p->link[1];
+ else
+ return p->data;
+ }
+
+ return NULL;
+}
+
+/* Search TREE for an item close to the value of ITEM, and return it.
+ This function will return a null pointer only if TREE is empty. */
+void *
+rb_find_close (const rb_tree *tree, const void *item)
+{
+ const rb_node *p;
+
+ assert (tree != NULL);
+ p = tree->root.link[0];
+ if (p == NULL)
+ return NULL;
+
+ for (;;)
+ {
+ int diff = tree->cmp (item, p->data, tree->param);
+ int t;
+
+ if (diff < 0)
+ t = 0;
+ else if (diff > 0)
+ t = 1;
+ else
+ return p->data;
+
+ if (p->link[t])
+ p = p->link[t];
+ else
+ return p->data;
+ }
+}
+
+/* Searches red-black tree TREE for an item matching ITEM. If found,
+ the item is removed from the tree and the actual item found is
+ returned to the caller. If no item matching ITEM exists in the
+ tree, returns NULL. */
+void *
+rb_delete (rb_tree *tree, const void *item)
+{
+ /* Algorithm based on RB-Delete and RB-Delete-Fixup from section
+ 14.4 of _Introduction to Algorithms_, Cormen et al., MIT Press
+ 1990, ISBN 0-262-03141-8. */
+
+ rb_node *pa[RB_MAX_HEIGHT]; /* Stack P: Nodes. */
+ char a[RB_MAX_HEIGHT]; /* Stack P: Bits. */
+ int k = 1; /* Stack P: Pointer. */
+
+ rb_node *w, *x, *y, *z;
+
+ assert (tree != NULL);
+
+ a[0] = 0;
+ pa[0] = &tree->root;
+ z = tree->root.link[0];
+ for (;;)
+ {
+ int diff;
+
+ if (z == NULL)
+ return NULL;
+
+ diff = tree->cmp (item, z->data, tree->param);
+ if (diff == 0)
+ break;
+
+ pa[k] = z;
+ if (diff < 0)
+ {
+ z = z->link[0];
+ a[k] = 0;
+ }
+ else if (diff > 0)
+ {
+ z = z->link[1];
+ a[k] = 1;
+ }
+ k++;
+ }
+ tree->count--;
+
+ item = z->data;
+
+ /* RB-Delete: Line 1. */
+ if (z->link[0] == NULL || z->link[1] == NULL)
+ {
+ /* Line 2. */
+ y = z;
+
+ /* Lines 4-6. */
+ if (y->link[0] != NULL)
+ x = y->link[0];
+ else
+ x = y->link[1];
+
+ pa[k - 1]->link[(int) a[k - 1]] = x;
+ }
+ else
+ {
+ pa[k] = z;
+ a[k++] = 1;
+
+ /* Line 3. */
+ y = z->link[1];
+ while (y->link[0])
+ {
+ pa[k] = y;
+ a[k++] = 0;
+ y = y->link[0];
+ }
+
+ /* Lines 4-6. */
+ x = y->link[1];
+
+ /* Lines 13-15. */
+ z->data = y->data;
+ pa[k - 1]->link[(int) a[k - 1]] = x;
+ }
+
+ /* Line 16. */
+ if (y->color == RB_RED)
+ {
+ free (y);
+ return (void *) item;
+ }
+
+ free (y);
+
+ /* Numbers below are line numbers from RB-Delete-Fixup. */
+ while (k > 1 && (x == NULL || x->color == RB_BLACK)) /* 1 */
+ {
+ if (a[k - 1] == 0) /* 2 */
+ {
+ w = pa[k - 1]->link[1]; /* 3 */
+
+ if (w->color == RB_RED) /* 4 */
+ {
+ /* Case 1. */
+ w->color = RB_BLACK; /* 5 */
+ pa[k - 1]->color = RB_RED; /* 6 */
+
+ pa[k - 1]->link[1] = w->link[0]; /* 7 */
+ w->link[0] = pa[k - 1];
+ pa[k - 2]->link[(int) a[k - 2]] = w;
+
+ pa[k] = pa[k - 1];
+ a[k] = 0;
+ pa[k - 1] = w;
+ k++;
+
+ w = pa[k - 1]->link[1]; /* 8 */
+ }
+
+ if ((w->link[0] == NULL || w->link[0]->color == RB_BLACK) /* 9 */
+ && (w->link[1] == NULL || w->link[1]->color == RB_BLACK))
+ {
+ /* Case 2. */
+ w->color = RB_RED; /* 10 */
+
+ x = pa[k - 1]; /* 11 */
+ k--;
+ }
+ else
+ {
+ if (w->link[1] == NULL || w->link[1]->color == RB_BLACK) /* 12 */
+ {
+ /* Case 3. */
+ w->link[0]->color = RB_BLACK; /* 13 */
+ w->color = RB_RED; /* 14 */
+
+ y = w->link[0]; /* 15 */
+ w->link[0] = y->link[1];
+ y->link[1] = w;
+
+ w = pa[k - 1]->link[1] = y; /* 16 */
+ }
+
+ /* Case 4. */
+ w->color = pa[k - 1]->color; /* 17 */
+ pa[k - 1]->color = RB_BLACK; /* 18 */
+ w->link[1]->color = RB_BLACK; /* 19 */
+
+ pa[k - 1]->link[1] = w->link[0]; /* 20 */
+ w->link[0] = pa[k - 1];
+ pa[k - 2]->link[(int) a[k - 2]] = w;
+
+ x = tree->root.link[0]; /* 21 */
+ break;
+ }
+ }
+ else
+ {
+ w = pa[k - 1]->link[0];
+ if (w->color == RB_RED)
+ {
+ /* Case 1. */
+ w->color = RB_BLACK;
+ pa[k - 1]->color = RB_RED;
+
+ pa[k - 1]->link[0] = w->link[1];
+ w->link[1] = pa[k - 1];
+ pa[k - 2]->link[(int) a[k - 2]] = w;
+
+ pa[k] = pa[k - 1];
+ a[k] = 1;
+ pa[k - 1] = w;
+ k++;
+
+ w = pa[k - 1]->link[0];
+ }
+
+ if ((w->link[0] == NULL || w->link[0]->color == RB_BLACK)
+ && (w->link[1] == NULL || w->link[1]->color == RB_BLACK))
+ {
+ /* Case 2. */
+ w->color = RB_RED;
+ x = pa[k - 1];
+ k--;
+ }
+ else
+ {
+ if (w->link[0] == NULL || w->link[0]->color == RB_BLACK)
+ {
+ /* Case 3. */
+ w->link[1]->color = RB_BLACK;
+ w->color = RB_RED;
+
+ y = w->link[1];
+ w->link[1] = y->link[0];
+ y->link[0] = w;
+
+ w = pa[k - 1]->link[0] = y;
+ }
+
+ /* Case 4. */
+ w->color = pa[k - 1]->color;
+ pa[k - 1]->color = RB_BLACK;
+ w->link[0]->color = RB_BLACK;
+
+ pa[k - 1]->link[0] = w->link[1];
+ w->link[1] = pa[k - 1];
+ pa[k - 2]->link[(int) a[k - 2]] = w;
+
+ x = tree->root.link[0];
+ break;
+ }
+ }
+ }
+
+ if (x != NULL)
+ x->color = RB_BLACK; /* 23 */
+
+ return (void *) item;
+}
+
+/* Inserts ITEM into TREE. Returns NULL if the item was inserted,
+ otherwise a pointer to the duplicate item. */
+void *
+rb_insert (rb_tree *tree, void *item)
+{
+ void **p;
+
+ assert (tree != NULL);
+
+ p = rb_probe (tree, item);
+ return (*p == item) ? NULL : *p;
+}
+
+/* If ITEM does not exist in TREE, inserts it and returns NULL. If a
+ matching item does exist, it is replaced by ITEM and the item
+ replaced is returned. The caller is responsible for freeing the
+ item returned. */
+void *
+rb_replace (rb_tree *tree, void *item)
+{
+ void **p;
+
+ assert (tree != NULL);
+
+ p = rb_probe (tree, item);
+ if (*p == item)
+ return NULL;
+ else
+ {
+ void *r = *p;
+ *p = item;
+ return r;
+ }
+}
+
+/* Delete ITEM from TREE when you know that ITEM must be in TREE. For
+ debugging purposes. */
+void *
+(rb_force_delete) (rb_tree *tree, void *item)
+{
+ void *found = rb_delete (tree, item);
+ assert (found != NULL);
+ return found;
+}
+
+#if SELF_TEST
+
+/* Used to flag delayed aborting. */
+int done = 0;
+
+/* Print the structure of node NODE of a red-black tree, which is
+ LEVEL levels from the top of the tree. Uses different delimiters
+ to visually distinguish levels. */
+void
+print_structure (rb_node *node, int level)
+{
+ char lc[] = "([{<`/";
+ char rc[] = ")]}>'\\";
+
+ assert (level <= 10);
+
+ if (node == NULL)
+ {
+ printf (" nil");
+ fflush (stdout);
+ return;
+ }
+ printf (" %c%d%c",
+ lc[level % 6], (int) node->data,
+ node->color == RB_BLACK ? 'b' : 'r');
+ fflush (stdout);
+ if (node->link[0] || node->link[1])
+ print_structure (node->link[0], level + 1);
+ if (node->link[1])
+ print_structure (node->link[1], level + 1);
+ printf ("%c", rc[level % 6]);
+ fflush (stdout);
+}
+
+/* Compare two integers A and B and return a strcmp()-type result. */
+int
+compare_ints (const void *a, const void *b, void *param unused)
+{
+ return ((int) a) - ((int) b);
+}
+
+/* Print the value of integer A. */
+void
+print_int (void *a, void *param unused)
+{
+ printf (" %d", (int) a);
+}
+
+/* Linearly print contents of TREE. */
+void
+print_contents (rb_tree *tree)
+{
+ rb_walk (tree, print_int, NULL);
+ printf ("\n");
+}
+
+/* Examine NODE in a red-black tree. *COUNT is increased by the
+ number of nodes in the tree, including the current one. Returns
+ the number of black nodes (including this node) in a path from this
+ node to any leaf. */
+int
+recurse_tree (rb_node *node, int *count, int ge, int le)
+{
+ if (node)
+ {
+ const int d = (int) node->data;
+ int nl = 1;
+ int nr = 1;
+
+ (*count)++;
+
+ if (!(d >= ge) || !(d <= le))
+ {
+ printf (" Node %d is out of order in the tree.\n", d);
+ done = 1;
+ }
+
+ if (node->link[0])
+ nl = recurse_tree (node->link[0], count, ge, d - 1);
+ if (node->link[1])
+ nr = recurse_tree (node->link[1], count, d + 1, le);
+
+ if (node->color != RB_RED && node->color != RB_BLACK)
+ {
+ printf (" Node %d is neither red nor black (%d).\n", d, node->color);
+ done = 1;
+ }
+
+ if (node->color == RB_RED
+ && node->link[0] && node->link[0]->color == RB_RED)
+ {
+ printf (" Red node %d has red left child %d\n",
+ d, (int) node->link[0]->data);
+ done = 1;
+ }
+
+ if (node->color == RB_RED
+ && node->link[1] && node->link[1]->color == RB_RED)
+ {
+ printf (" Red node %d has red right child %d\n",
+ d, (int) node->link[1]->data);
+ done = 1;
+ }
+
+ if (nl != nr)
+ {
+ printf (" Node %d has two different black-heights: left bh=%d, "
+ "right bh=%d\n", d, nl, nr);
+ done = 1;
+ }
+
+ return (node->color == RB_BLACK) + nl;
+ }
+ else return 1;
+}
+
+/* Check that everything about TREE is kosher. */
+void
+verify_tree (rb_tree *tree)
+{
+ int count = 0;
+ recurse_tree (tree->root.link[0], &count, INT_MIN, INT_MAX);
+ if (count != tree->count)
+ {
+ printf (" Tree has %d nodes, but tree count is %d.\n",
+ count, tree->count);
+ done = 1;
+ }
+ if (done)
+ abort ();
+}
+
+/* Arrange the N elements of ARRAY in random order. */
+void
+shuffle (int *array, int n)
+{
+ int i;
+
+ for (i = 0; i < n; i++)
+ {
+ int j = i + rand () % (n - i);
+ int t = array[j];
+ array[j] = array[i];
+ array[i] = t;
+ }
+}
+
+/* Compares red-black trees rooted at A and B, making sure that they
+ are identical. */
+void
+compare_trees (rb_node *a, rb_node *b)
+{
+ if (a == NULL || b == NULL)
+ {
+ assert (a == NULL && b == NULL);
+ return;
+ }
+ if (a->data != b->data || a->color != b->color
+ || ((a->link[0] != NULL) ^ (b->link[0] != NULL))
+ || ((a->link[1] != NULL) ^ (b->link[1] != NULL)))
+ {
+ printf (" Copied nodes differ: %d b=%d a->color=%d b->color=%d a:",
+ (int) a->data, (int) b->data, a->color, b->color);
+ if (a->link[0])
+ printf ("l");
+ if (a->link[1])
+ printf ("r");
+ printf (" b:");
+ if (b->link[0])
+ printf ("l");
+ if (b->link[1])
+ printf ("r");
+ printf ("\n");
+ abort ();
+ }
+ if (a->link[0] != NULL)
+ compare_trees (a->link[0], b->link[0]);
+ if (a->link[1] != NULL)
+ compare_trees (a->link[1], b->link[1]);
+}
+
+/* Simple stress test procedure for the red-black tree routines. Does
+ the following:
+
+ * Generate a random number seed. By default this is generated from
+ the current time. You can also pass a seed value on the command
+ line if you want to test the same case. The seed value is
+ displayed.
+
+ * Create a tree and insert the integers from 0 up to TREE_SIZE - 1
+ into it, in random order. Verify the tree structure after each
+ insertion.
+
+ * Remove each integer from the tree, in a different random order.
+ After each deletion, verify the tree structure; also, make a copy
+ of the tree into a new tree, verify the copy and compare it to the
+ original, then destroy the copy.
+
+ * Destroy the tree, increment the random seed value, and start over.
+
+ If you make any modifications to the red-black tree routines, then
+ you might want to insert some calls to print_structure() at
+ strategic places in order to be able to see what's really going on.
+ Also, memory debuggers like Checker or Purify are very handy. */
+#define TREE_SIZE 16
+#define N_ITERATIONS 1024
+int
+main (int argc, char **argv)
+{
+ int array[TREE_SIZE];
+ int seed;
+ int iteration;
+
+ if (argc == 2)
+ seed = atoi (argv[1]);
+ else
+ seed = time (0) * 257 % 32768;
+
+ fputs ("Testing rb...\n", stdout);
+
+ for (iteration = 1; iteration <= N_ITERATIONS; iteration++)
+ {
+ rb_tree *tree;
+ int i;
+
+ printf ("Iteration %4d/%4d: seed=%5d", iteration, N_ITERATIONS, seed);
+ fflush (stdout);
+
+ srand (seed++);
+
+ for (i = 0; i < TREE_SIZE; i++)
+ array[i] = i;
+ shuffle (array, TREE_SIZE);
+
+ tree = rb_create (compare_ints, NULL);
+ for (i = 0; i < TREE_SIZE; i++)
+ rb_force_insert (tree, (void *) (array[i]));
+ verify_tree (tree);
+
+ shuffle (array, TREE_SIZE);
+ for (i = 0; i < TREE_SIZE; i++)
+ {
+ rb_tree *copy;
+
+ rb_delete (tree, (void *) (array[i]));
+ verify_tree (tree);
+
+ copy = rb_copy (tree, NULL);
+ verify_tree (copy);
+ compare_trees (tree->root.link[0], copy->root.link[0]);
+ rb_destroy (copy, NULL);
+
+ if (i % 128 == 0)
+ {
+ putchar ('.');
+ fflush (stdout);
+ }
+ }
+ fputs (" good.\n", stdout);
+
+ rb_destroy (tree, NULL);
+ }
+
+ return 0;
+}
+#endif /* SELF_TEST */
+
+/*
+ Local variables:
+ compile-command: "gcc -DSELF_TEST=1 -W -Wall -I. -o ./rb-test rb.c"
+ End:
+*/