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authorcvs2git <rtems-devel@rtems.org>2007-08-07 16:14:18 +0000
committercvs2git <rtems-devel@rtems.org>2007-08-07 16:14:18 +0000
commit2c55da25b90fc7c7a59464a90d2c322bbc5047b5 (patch)
tree63d296b347fe8c6ab28ba28e6489f792404625ee /avl-1.4.0/avl.html
parent66d25567fe424bb55fde088f3d45e9ed044400c1 (diff)
This commit was manufactured by cvs2svn to create tag 'rtems-addon-rtems-addon-packages-4-7-99-2
packages-4-7-99-2'. 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/base/version.c ncurses-5.2/ncurses/base/vsscanf.c ncurses-5.2/ncurses/base/wresize.c ncurses-5.2/ncurses/curses.priv.h ncurses-5.2/ncurses/fifo_defs.h ncurses-5.2/ncurses/llib-lncurses ncurses-5.2/ncurses/modules ncurses-5.2/ncurses/tinfo/MKcaptab.awk ncurses-5.2/ncurses/tinfo/MKfallback.sh ncurses-5.2/ncurses/tinfo/MKnames.awk ncurses-5.2/ncurses/tinfo/README ncurses-5.2/ncurses/tinfo/access.c ncurses-5.2/ncurses/tinfo/add_tries.c ncurses-5.2/ncurses/tinfo/alloc_entry.c ncurses-5.2/ncurses/tinfo/alloc_ttype.c ncurses-5.2/ncurses/tinfo/captoinfo.c ncurses-5.2/ncurses/tinfo/comp_error.c ncurses-5.2/ncurses/tinfo/comp_expand.c ncurses-5.2/ncurses/tinfo/comp_hash.c ncurses-5.2/ncurses/tinfo/comp_parse.c ncurses-5.2/ncurses/tinfo/comp_scan.c ncurses-5.2/ncurses/tinfo/doalloc.c ncurses-5.2/ncurses/tinfo/free_ttype.c ncurses-5.2/ncurses/tinfo/getenv_num.c ncurses-5.2/ncurses/tinfo/home_terminfo.c ncurses-5.2/ncurses/tinfo/init_keytry.c ncurses-5.2/ncurses/tinfo/keys.list 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 2007-08-07 16:14:17 UTC Joel Sherrill <joel.sherrill@OARcorp.com> '2007-08-07 Joel Sherrill <joel.sherrill@OARcorp.com>': ChangeLog RTEMS_Makefiles/Makefile.bfd RTEMS_Makefiles/Makefile.libtecla RTEMS_Makefiles/Makefile.ncurses RTEMS_Makefiles/Makefile.ncurses-5.3 RTEMS_Makefiles/Makefile.readline-4.3 RTEMS_Makefiles/Makefile.zlib SUPPORT VERSION bit bit_bfd libtecla-1.4.1/CHANGES libtecla-1.4.1/INSTALL libtecla-1.4.1/LICENSE.TERMS libtecla-1.4.1/Makefile libtecla-1.4.1/Makefile.in libtecla-1.4.1/Makefile.rules libtecla-1.4.1/Makefile.stub libtecla-1.4.1/PORTING libtecla-1.4.1/README libtecla-1.4.1/RELEASE.NOTES libtecla-1.4.1/config.guess libtecla-1.4.1/config.sub libtecla-1.4.1/configure libtecla-1.4.1/configure.in libtecla-1.4.1/cplfile.c libtecla-1.4.1/cplfile.h libtecla-1.4.1/cplmatch.c libtecla-1.4.1/demo.c libtecla-1.4.1/demo2.c libtecla-1.4.1/direader.c libtecla-1.4.1/direader.h libtecla-1.4.1/enhance.c libtecla-1.4.1/expand.c libtecla-1.4.1/freelist.c libtecla-1.4.1/freelist.h libtecla-1.4.1/getline.c libtecla-1.4.1/getline.h libtecla-1.4.1/hash.c libtecla-1.4.1/hash.h libtecla-1.4.1/history.c libtecla-1.4.1/history.h libtecla-1.4.1/homedir.c libtecla-1.4.1/homedir.h libtecla-1.4.1/html/changes.html libtecla-1.4.1/html/cpl_complete_word.html libtecla-1.4.1/html/ef_expand_file.html libtecla-1.4.1/html/enhance.html libtecla-1.4.1/html/gl_get_line.html libtecla-1.4.1/html/index.html libtecla-1.4.1/html/libtecla.html libtecla-1.4.1/html/pca_lookup_file.html libtecla-1.4.1/html/release.html libtecla-1.4.1/install-sh libtecla-1.4.1/keytab.c libtecla-1.4.1/keytab.h libtecla-1.4.1/libtecla.h libtecla-1.4.1/libtecla.map libtecla-1.4.1/man3/cfc_file_start.3 libtecla-1.4.1/man3/cfc_literal_escapes.3 libtecla-1.4.1/man3/cfc_set_check_fn.3 libtecla-1.4.1/man3/cpl_add_completion.3 libtecla-1.4.1/man3/cpl_complete_word.3 libtecla-1.4.1/man3/cpl_file_completions.3 libtecla-1.4.1/man3/cpl_last_error.3 libtecla-1.4.1/man3/cpl_list_completions.3 libtecla-1.4.1/man3/cpl_record_error.3 libtecla-1.4.1/man3/del_CplFileConf.3 libtecla-1.4.1/man3/del_ExpandFile.3 libtecla-1.4.1/man3/del_GetLine.3 libtecla-1.4.1/man3/del_PathCache.3 libtecla-1.4.1/man3/del_PcaPathConf.3 libtecla-1.4.1/man3/del_WordCompletion.3 libtecla-1.4.1/man3/ef_expand_file.3 libtecla-1.4.1/man3/ef_last_error.3 libtecla-1.4.1/man3/ef_list_expansions.3 libtecla-1.4.1/man3/enhance.3 libtecla-1.4.1/man3/gl_change_terminal.3 libtecla-1.4.1/man3/gl_clear_history.3 libtecla-1.4.1/man3/gl_configure_getline.3 libtecla-1.4.1/man3/gl_customize_completion.3 libtecla-1.4.1/man3/gl_echo_mode.3 libtecla-1.4.1/man3/gl_get_line.3 libtecla-1.4.1/man3/gl_group_history.3 libtecla-1.4.1/man3/gl_ignore_signal.3 libtecla-1.4.1/man3/gl_last_signal.3 libtecla-1.4.1/man3/gl_limit_history.3 libtecla-1.4.1/man3/gl_load_history.3 libtecla-1.4.1/man3/gl_lookup_history.3 libtecla-1.4.1/man3/gl_prompt_style.3 libtecla-1.4.1/man3/gl_range_of_history.3 libtecla-1.4.1/man3/gl_resize_history.3 libtecla-1.4.1/man3/gl_save_history.3 libtecla-1.4.1/man3/gl_show_history.3 libtecla-1.4.1/man3/gl_size_of_history.3 libtecla-1.4.1/man3/gl_state_of_history.3 libtecla-1.4.1/man3/gl_terminal_size.3 libtecla-1.4.1/man3/gl_toggle_history.3 libtecla-1.4.1/man3/gl_trap_signal.3 libtecla-1.4.1/man3/gl_watch_fd.3 libtecla-1.4.1/man3/libtecla.3 libtecla-1.4.1/man3/libtecla_version.3 libtecla-1.4.1/man3/new_CplFileConf.3 libtecla-1.4.1/man3/new_ExpandFile.3 libtecla-1.4.1/man3/new_GetLine.3 libtecla-1.4.1/man3/new_PathCache.3 libtecla-1.4.1/man3/new_PcaPathConf.3 libtecla-1.4.1/man3/new_WordCompletion.3 libtecla-1.4.1/man3/pca_last_error.3 libtecla-1.4.1/man3/pca_lookup_file.3 libtecla-1.4.1/man3/pca_path_completions.3 libtecla-1.4.1/man3/pca_scan_path.3 libtecla-1.4.1/man3/pca_set_check_fn.3 libtecla-1.4.1/man3/ppc_file_start.3 libtecla-1.4.1/man3/ppc_literal_escapes.3 libtecla-1.4.1/pathutil.c libtecla-1.4.1/pathutil.h libtecla-1.4.1/pcache.c libtecla-1.4.1/stringrp.c libtecla-1.4.1/stringrp.h libtecla-1.4.1/strngmem.c libtecla-1.4.1/strngmem.h libtecla-1.4.1/update_html libtecla-1.4.1/update_version libtecla-1.4.1/version.c ncurses-5.3/config.sub ncurses-5.3/misc/run_tic.sh 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+<HTML>
+<HEAD>
+<!-- This HTML file has been created by texi2html 1.54
+ from ./avl.texinfo on 6 October 1999 -->
+
+<TITLE>libavl manual</TITLE>
+
+</HEAD>
+<BODY>
+<H1>libavl</H1>
+<H2>A library for manipulation of balanced binary trees</H2>
+<ADDRESS>Ben Pfaff</ADDRESS>
+<P>
+<P><HR><P>
+<H1>Table of Contents</H1>
+<UL>
+<LI><A NAME="TOC1" HREF="avl.html#SEC1">Introduction to balanced binary trees</A>
+<LI><A NAME="TOC2" HREF="avl.html#SEC2">Introduction to threaded trees</A>
+<LI><A NAME="TOC3" HREF="avl.html#SEC3">Types</A>
+<LI><A NAME="TOC4" HREF="avl.html#SEC4">Functions</A>
+<LI><A NAME="TOC5" HREF="avl.html#SEC5">Tree Creation</A>
+<LI><A NAME="TOC6" HREF="avl.html#SEC6">Insertion and Deletion</A>
+<LI><A NAME="TOC7" HREF="avl.html#SEC7">Searching</A>
+<LI><A NAME="TOC8" HREF="avl.html#SEC8">Iteration</A>
+<LI><A NAME="TOC9" HREF="avl.html#SEC9">Conversion</A>
+<LI><A NAME="TOC10" HREF="avl.html#SEC10">Author</A>
+<LI><A NAME="TOC11" HREF="avl.html#SEC11">Index</A>
+</UL>
+<P><HR><P>
+
+
+<H1><A NAME="SEC1" HREF="avl.html#TOC1">Introduction to balanced binary trees</A></H1>
+
+<P>
+<A NAME="IDX1"></A>
+Consider some techniques that can be used to find a particular item in a
+data set. Typical methods include sequential searching, digital
+searching, hash tables, and binary searching.
+
+</P>
+<P>
+Sequential searching is simple, but slow (O(n)). Digital searching
+requires that the entire data set be known in advance, and memory
+efficient implementations are slow.
+
+</P>
+<P>
+Hash tables are fast (O(1)) for static data sets, but they can be
+wasteful of memory. It can be difficult to choose an effective hash
+function. Some hash tables variants also make deletion an expensive
+operation.
+
+</P>
+<P>
+<A NAME="IDX2"></A>
+Binary search techniques work almost as quickly (O(log(n)) on an ordered
+table, or on a binary tree. Binary trees also allow easy iteration over
+the data in the tree in sorted order. With hash tables it is necessary
+to sort the data before iterating, and after sorting the data is no
+longer in hash form.
+
+</P>
+<P>
+Binary trees are efficient for insertion, deletion, and searching, if
+data are inserted in random order. But, if data are inserted in order
+using a naive algorithm, binary search degenerates to sequential search.
+
+</P>
+<P>
+<A NAME="IDX3"></A>
+<A NAME="IDX4"></A>
+<A NAME="IDX5"></A>
+In turn, this problem can be solved by <STRONG>rebalancing</STRONG> the tree after
+each insertion or deletion. In rebalancing, nodes are rearranged via
+transformations called <STRONG>rotations</STRONG> using an algorithm that tends to
+minimize the tree's height.
+
+</P>
+<P>
+There are several schemes for rebalancing binary trees. The two most
+common types of balanced tree are <STRONG>AVL trees</STRONG> and <STRONG>red-black
+trees</STRONG>. libavl implements both types:
+
+</P>
+
+<UL>
+<LI>
+
+<A NAME="IDX6"></A>
+<A NAME="IDX7"></A>
+AVL trees, invented by Russian mathematicians G. M. Adel'son-Velskii and
+E. M. Landis, ensure that, for each node, the difference in height
+between its subtrees (the <STRONG>balance factor</STRONG>) is not greater than 1.
+
+<LI>
+
+Red-black trees, invented by R. Bayer and studied at length by
+L. J. Guibas and R. Sedgewick, assign each node of a tree a color (red
+or black), and specify a set of rules governing how red and black nodes
+may be arranged.
+</UL>
+
+<P>
+The table below presents a comparison among unbalanced binary trees, AVL
+trees, and red-black trees. In the table, <VAR>n</VAR> is the number of
+nodes in the tree and <VAR>h</VAR> is the tree's height before the
+operation. <STRONG>lg</STRONG> is the base-2 logarithm function.
+
+</P>
+<TABLE>
+
+<TR>Operation
+<BR>
+<TR>
+<TD> Binary Tree
+<TD> AVL Tree
+<TD> Red-Black Tree
+
+<BR>
+<TR>Time per insertion or deletion
+<BR>
+<TR>
+<TD> O(<VAR>h</VAR>)
+<TD> O(lg <VAR>n</VAR>)
+<TD> O(lg <VAR>n</VAR>)
+
+<BR>
+<TR>Time for insertion of <VAR>k</VAR> nodes having sequential values
+<BR>
+<TR>
+<TD> O(<VAR>k</VAR>^2)
+<TD> O(<VAR>n</VAR> lg <VAR>n</VAR>)
+<TD> O(<VAR>n</VAR> lg <VAR>n</VAR>)
+
+<BR>
+<TR>Time for insertion of <VAR>k</VAR> nodes having random values
+<BR>
+<TR>
+<TD> O(<VAR>n</VAR> lg <VAR>n</VAR>)
+<TD> O(<VAR>n</VAR> lg <VAR>n</VAR>)
+<TD> O(<VAR>n</VAR> lg <VAR>n</VAR>)
+
+<BR>
+<TR>Maximum number of rotations per insertion
+<BR>
+<TR>
+<TD> 0
+<TD> 1
+<TD> lg <VAR>n</VAR>
+
+<BR>
+<TR>Maximum number of rotations per deletion
+<BR>
+<TR>
+<TD> 0
+<TD> lg <VAR>n</VAR>
+<TD> lg <VAR>n</VAR>
+
+<BR>
+<TR>Maximum <VAR>h</VAR> as a function of <VAR>n</VAR>
+<BR>
+<TR>
+<TD> <VAR>n</VAR>
+<TD> 1.44 lg (<VAR>n</VAR> + 2) - .328
+<TD> 2 lg (<VAR>n</VAR> + 1)
+
+<BR>
+<TR>Minimum <VAR>n</VAR> as a function of <VAR>h</VAR>
+<BR>
+<TR>
+<TD> <VAR>h</VAR>
+<TD> 2^((<VAR>h</VAR> + .328) / 1.44) - 2
+<TD> 2^(<VAR>h</VAR> / 2) - 1
+</TABLE>
+
+There are alternatives to AVL trees that share some of their properties.
+For instance, skip lists, 2-3 trees, and splay trees all allow O(log(n))
+insertion and deletion. The main disadvantage of these methods is that
+their operations are not as well documented in the literature.
+
+
+
+<H1><A NAME="SEC2" HREF="avl.html#TOC2">Introduction to threaded trees</A></H1>
+
+<P>
+<STRONG>Threading</STRONG> is a clever method that simplifies binary tree
+traversal.
+
+</P>
+<P>
+Nodes in a unthreaded binary tree that have zero or one subnodes have
+two or one null subnode pointers, respectively. In a threaded binary
+tree, a left child pointer that would otherwise be null is used to point
+to the node's inorder<A NAME="DOCF1" HREF="avl.html#FOOT1">(1)</A>
+predecessor, and in a null right child pointer points to its inorder
+successor.
+
+</P>
+<P>
+In a threaded tree, it is always possible to find the next node and the
+previous node of a node, given only a pointer to the node in question.
+In an unthreaded tree, it's also necessary to have a list of the nodes
+between the node in question and root of the tree.
+
+</P>
+<P>
+Advantages of a threaded tree compared to an unthreaded one include:
+
+</P>
+
+<UL>
+<LI>
+
+Faster traversal and less memory usage during traversal, since no stack
+need be maintained.
+
+<LI>
+
+Greater generality, since one can go from a node to its successor or
+predecessor given only the node, simplifying algorithms that require
+moving forward and backward in a tree.
+</UL>
+
+<P>
+Some disadvantages of threaded trees are:
+
+</P>
+
+<UL>
+<LI>
+
+Slower insertion and deletion, since threads need to be maintained. In
+somes cases, this can be alleviated by constructing the tree as an
+unthreaded tree, then threading it with a special libavl function.
+
+<LI>
+
+In theory, threaded trees need two extra bits per node to indicate
+whether each child pointer points to an ordinary node or the node's
+successor/predecessor node. In libavl, however, these bits are stored
+in a byte that is used for structure alignment padding in unthreaded
+binary trees, so no extra storage is used.
+</UL>
+
+<P>
+A <STRONG>right-threaded binary tree</STRONG> is similar to a threaded binary tree,
+but threads are only maintained on the right side of each node. This
+allows for traversal to the right (toward larger values) but not to the
+left (toward smaller values). Right-threaded trees are convenient when
+the properties of a threaded tree are desirable, but traversal in
+reverse sort order is not necessary. Not threading the left links saves
+time in insertions and deletions.
+
+</P>
+<P>
+Left-threaded binary trees also exist, but they are not implemented by
+libavl. The same effect can be obtained by sorting the tree in the
+opposite order.
+
+</P>
+
+
+<H1><A NAME="SEC3" HREF="avl.html#TOC3">Types</A></H1>
+
+<P>
+The following types are defined and used by libavl:
+
+</P>
+<P>
+<DL>
+<DT><U>Data Type:</U> <B>avl_tree</B>
+<DD><A NAME="IDX8"></A>
+<DT><U>Data Type:</U> <B>avlt_tree</B>
+<DD><A NAME="IDX9"></A>
+<DT><U>Data Type:</U> <B>avltr_tree</B>
+<DD><A NAME="IDX10"></A>
+<DT><U>Data Type:</U> <B>rb_tree</B>
+<DD><A NAME="IDX11"></A>
+These are the data types used to represent a tree. Although they are
+defined in the libavl header files, it should never be necessary to
+access them directly. Instead, all accesses should take place through
+libavl functions.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Data Type:</U> <B>avl_node</B>
+<DD><A NAME="IDX12"></A>
+<DT><U>Data Type:</U> <B>avlt_node</B>
+<DD><A NAME="IDX13"></A>
+<DT><U>Data Type:</U> <B>avltr_node</B>
+<DD><A NAME="IDX14"></A>
+<DT><U>Data Type:</U> <B>rb_node</B>
+<DD><A NAME="IDX15"></A>
+These are the data types used to represent individual nodes in a tree.
+Similar cautions apply as with <CODE>avl_tree</CODE> structures.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Data Type:</U> <B>avl_traverser</B>
+<DD><A NAME="IDX16"></A>
+<DT><U>Data Type:</U> <B>avlt_traverser</B>
+<DD><A NAME="IDX17"></A>
+<DT><U>Data Type:</U> <B>avltr_traverser</B>
+<DD><A NAME="IDX18"></A>
+<DT><U>Data Type:</U> <B>rb_traverser</B>
+<DD><A NAME="IDX19"></A>
+These are the data types used by the <CODE>avl_traverse</CODE> family of
+functions to iterate across the tree. Again, these are opaque
+structures.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Data Type:</U> <B>avl_comparison_func</B>
+<DD><A NAME="IDX20"></A>
+Every tree must have an ordering defined by a function of this type. It
+must have the following signature:
+
+</P>
+
+<PRE>
+int <VAR>compare</VAR> (const void *<VAR>a</VAR>, const void *<VAR>b</VAR>, void *<VAR>param</VAR>)
+</PRE>
+
+<P>
+The return value is expected to be like that returned by <CODE>strcmp</CODE>
+in the standard C library: negative if <VAR>a</VAR> &#60; <VAR>b</VAR>, zero if
+<VAR>a</VAR> = <VAR>b</VAR>, positive if <VAR>a</VAR> &#62; <VAR>b</VAR>. <VAR>param</VAR> is an
+arbitrary value defined by the user when the tree was created.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Data Type:</U> <B>avl_node_func</B>
+<DD><A NAME="IDX21"></A>
+This is a class of function called to perform an operation on a data
+item. Functions of this type have the following signature:
+
+</P>
+
+<PRE>
+void <VAR>operate</VAR> (void *<VAR>data</VAR>, void *<VAR>param</VAR>)
+</PRE>
+
+<P>
+<VAR>data</VAR> is the data item and <VAR>param</VAR> is an arbitrary user-defined
+value set when the tree was created.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Data Type:</U> <B>avl_copy_func</B>
+<DD><A NAME="IDX22"></A>
+
+</P>
+<P>
+This is a class of function called to make a new copy of a node's data.
+Functions of this type have the following signature:
+
+</P>
+
+<PRE>
+void *<VAR>copy</VAR> (void *<VAR>data</VAR>, void *<VAR>param</VAR>)
+</PRE>
+
+<P>
+The function should return a new copy of <VAR>data</VAR>. <VAR>param</VAR> is an
+arbitrary user-defined value set when the tree was created.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Macro:</U> <B>AVL_MAX_HEIGHT</B>
+<DD><A NAME="IDX23"></A>
+This macro defines the maximum height of an AVL tree that can be handled
+by functions that maintain a stack of nodes descended. The default
+value is 32, which allows for AVL trees with a maximum number of nodes
+between 5,704,880 and 4,294,967,295, depending on order of insertion.
+This macro may be defined by the user before including any AVL tree
+header file, in which case libavl will honor that value.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Macro:</U> <B>RB_MAX_HEIGHT</B>
+<DD><A NAME="IDX24"></A>
+This macro defines the maximum height of an AVL tree that can be handled
+by functions that maintain a stack of nodes descended. The default
+value is 32, which allows for red-black trees with a maximum number of
+nodes of at least 65535. This macro may be defined by the user before
+including the red-black tree header file, in which case libavl will
+honor that value.
+</DL>
+
+</P>
+
+
+<H1><A NAME="SEC4" HREF="avl.html#TOC4">Functions</A></H1>
+
+<P>
+<A NAME="IDX25"></A>
+<A NAME="IDX26"></A>
+<A NAME="IDX27"></A>
+libavl is four libraries in one:
+
+</P>
+
+<UL>
+<LI>
+
+An unthreaded AVL tree library.
+
+<LI>
+
+A threaded AVL tree library.
+
+<LI>
+
+A right-threaded AVL tree library.
+
+<LI>
+
+A red-black tree library.
+</UL>
+
+<P>
+Identifiers in these libraries are prefixed by <CODE>avl_</CODE>,
+<CODE>avlt_</CODE>, <CODE>avltr_</CODE>, and <CODE>rb_</CODE>, with corresponding header
+files <TT>`avl.h'</TT>, <TT>`avlt.h'</TT>, <TT>`avltr.h'</TT>, and <TT>`rb.h'</TT>,
+respectively. The functions that they declare are defined in the
+<TT>`.c'</TT> files with the same names.
+
+</P>
+<P>
+Most tree functions are implemented in all three libraries, but
+threading allows more generality of operation. So, the threaded and
+right-threaded libraries offer a few additional functions for finding
+the next or previous node from a given node. In addition, they offer
+functions for converting trees from threaded or right-threaded
+representations to unthreaded, and vice versa.<A NAME="DOCF2" HREF="avl.html#FOOT2">(2)</A>
+
+</P>
+
+
+<H1><A NAME="SEC5" HREF="avl.html#TOC5">Tree Creation</A></H1>
+
+<P>
+These functions deal with creation and destruction of AVL trees.
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> avl_tree * <B>avl_create</B> <I>(avl_comparison_func <VAR>compare</VAR>, void *<VAR>param</VAR>)</I>
+<DD><A NAME="IDX28"></A>
+<DT><U>Function:</U> avlt_tree * <B>avlt_create</B> <I>(avlt_comparison_func <VAR>compare</VAR>, void *<VAR>param</VAR>)</I>
+<DD><A NAME="IDX29"></A>
+<DT><U>Function:</U> avltr_tree * <B>avltr_create</B> <I>(avltr_comparison_func <VAR>compare</VAR>, void *<VAR>param</VAR>)</I>
+<DD><A NAME="IDX30"></A>
+<DT><U>Function:</U> rb_tree * <B>rb_create</B> <I>(avl_comparison_func <VAR>compare</VAR>, void *<VAR>param</VAR>)</I>
+<DD><A NAME="IDX31"></A>
+Create a new, empty tree with comparison function <VAR>compare</VAR>.
+Arbitrary user data <VAR>param</VAR> is saved so that it can be passed to
+user callback functions.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void <B>avl_destroy</B> <I>(avl_tree *<VAR>tree</VAR>, avl_node_func <VAR>free</VAR>)</I>
+<DD><A NAME="IDX32"></A>
+<DT><U>Function:</U> void <B>avlt_destroy</B> <I>(avlt_tree *<VAR>tree</VAR>, avl_node_func <VAR>free</VAR>)</I>
+<DD><A NAME="IDX33"></A>
+<DT><U>Function:</U> void <B>avltr_destroy</B> <I>(avltr_tree *<VAR>tree</VAR>, avl_node_func <VAR>free</VAR>)</I>
+<DD><A NAME="IDX34"></A>
+<DT><U>Function:</U> void <B>rb_destroy</B> <I>(rb_tree *<VAR>tree</VAR>, avl_node_func <VAR>free</VAR>)</I>
+<DD><A NAME="IDX35"></A>
+Destroys <VAR>tree</VAR>, releasing all of its storage. If <VAR>free</VAR> is
+non-null, then it is called for every node in postorder before that node
+is freed.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void <B>avl_free</B> <I>(avl_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX36"></A>
+<DT><U>Function:</U> void <B>avlt_free</B> <I>(avlt_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX37"></A>
+<DT><U>Function:</U> void <B>avltr_free</B> <I>(avltr_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX38"></A>
+<DT><U>Function:</U> void <B>rb_free</B> <I>(rb_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX39"></A>
+Destroys <VAR>tree</VAR>, releasing all of its storage. The data in each
+node is freed with a call to the standard C library function
+<CODE>free</CODE>.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> avl_tree * <B>avl_copy</B> <I>(const avl_tree *<VAR>tree</VAR>, avl_copy_func <VAR>copy</VAR>)</I>
+<DD><A NAME="IDX40"></A>
+<DT><U>Function:</U> avlt_tree * <B>avl_copy</B> <I>(const avlt_tree *<VAR>tree</VAR>, avl_copy_func <VAR>copy</VAR>)</I>
+<DD><A NAME="IDX41"></A>
+<DT><U>Function:</U> avltr_tree * <B>avl_copy</B> <I>(const avltr_tree *<VAR>tree</VAR>, avl_copy_func <VAR>copy</VAR>)</I>
+<DD><A NAME="IDX42"></A>
+<DT><U>Function:</U> rb_tree * <B>rb_copy</B> <I>(const rb_tree *<VAR>tree</VAR>, avl_copy_func <VAR>copy</VAR>)</I>
+<DD><A NAME="IDX43"></A>
+Copies the contents of <VAR>tree</VAR> into a new tree, and returns the new
+tree. If <VAR>copy</VAR> is non-null, then it is called to make a new copy
+of each node's data; otherwise, the node data is copied verbatim into
+the new tree.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> int <B>avl_count</B> <I>(const avl_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX44"></A>
+<DT><U>Function:</U> int <B>avlt_count</B> <I>(const avlt_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX45"></A>
+<DT><U>Function:</U> int <B>avltr_count</B> <I>(const avltr_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX46"></A>
+<DT><U>Function:</U> int <B>rb_count</B> <I>(const rb_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX47"></A>
+Returns the number of nodes in <VAR>tree</VAR>.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>xmalloc</B> <I>(size_t <VAR>size</VAR>)</I>
+<DD><A NAME="IDX48"></A>
+This is not a function defined by libavl. Instead, it is a function
+that the user program can define. It must allocate <VAR>size</VAR> bytes
+using <CODE>malloc</CODE> and return it. It can handle out-of-memory errors
+however it chooses, but it may not ever return a null pointer.
+
+</P>
+<P>
+If there is an <CODE>xmalloc</CODE> function defined for use by libavl, the
+source files (<TT>`avl.c'</TT>, <TT>`avlt.c'</TT>, <TT>`avltr.c'</TT>, <TT>`rb.c'</TT>)
+must be compiled with <CODE>HAVE_XMALLOC</CODE> defined. Otherwise, the
+library will use its internal static <CODE>xmalloc</CODE>, which handles
+out-of-memory errors by printing a message <SAMP>`virtual memory
+exhausted'</SAMP> to stderr and terminating the program with exit code
+<CODE>EXIT_FAILURE</CODE>.
+</DL>
+
+</P>
+
+
+<H1><A NAME="SEC6" HREF="avl.html#TOC6">Insertion and Deletion</A></H1>
+
+<P>
+These function insert nodes, delete nodes, and search for nodes in
+trees.
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void ** <B>avl_probe</B> <I>(avl_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX49"></A>
+<DT><U>Function:</U> void ** <B>avlt_probe</B> <I>(avlt_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX50"></A>
+<DT><U>Function:</U> void ** <B>avltr_probe</B> <I>(avltr_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX51"></A>
+<DT><U>Function:</U> void ** <B>rb_probe</B> <I>(rb_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX52"></A>
+These are the workhorse functions for tree insertion. They search
+<VAR>tree</VAR> for a node with data matching <VAR>data</VAR>. If found, a
+pointer to the matching data is returned. Otherwise, a new node is
+created for <VAR>data</VAR>, and a pointer to that data is returned. In
+either case, the pointer returned can be changed by the user, but the
+key data used by the tree's comparison must not be changed<A NAME="DOCF3" HREF="avl.html#FOOT3">(3)</A>.
+
+</P>
+<P>
+It is usually easier to use one of the <CODE>avl_insert</CODE> or
+<CODE>avl_replace</CODE> functions instead of <CODE>avl_probe</CODE> directly.
+
+</P>
+<P>
+<STRONG>Please note:</STRONG> It's not a particularly good idea to insert a null
+pointer as a data item into a tree, because several libavl functions
+return a null pointer to indicate failure. You can sometimes avoid a
+problem by using functions that return a pointer to a pointer instead of
+a plain pointer. Also be wary of this when casting an arithmetic type
+to a void pointer for insertion--on typical architectures, 0's become
+null pointers when this is done.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>avl_insert</B> <I>(avl_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX53"></A>
+<DT><U>Function:</U> void * <B>avlt_insert</B> <I>(avlt_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX54"></A>
+<DT><U>Function:</U> void * <B>avltr_insert</B> <I>(avltr_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX55"></A>
+<DT><U>Function:</U> void * <B>rb_insert</B> <I>(rb_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX56"></A>
+If a node with data matching <VAR>data</VAR> exists in <VAR>tree</VAR>, returns
+the matching data item. Otherwise, inserts <VAR>data</VAR> into <VAR>tree</VAR>
+and returns a null pointer.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void <B>avl_force_insert</B> <I>(avl_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX57"></A>
+<DT><U>Function:</U> void <B>avlt_force_insert</B> <I>(avlt_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX58"></A>
+<DT><U>Function:</U> void <B>avltr_force_insert</B> <I>(avltr_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX59"></A>
+<DT><U>Function:</U> void <B>rb_force_insert</B> <I>(rb_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX60"></A>
+Inserts <VAR>data</VAR> into <VAR>tree</VAR>. If a node with data matching
+<VAR>data</VAR> exists in <VAR>tree</VAR>, aborts the program with an assertion
+violation. This function is implemented as a macro; if it is used, the
+standard C header <CODE>assert.h</CODE> must also be included. If macro
+<CODE>NDEBUG</CODE> is defined when a libavl header is included, these
+functions are short-circuited to a direct call to <CODE>avl_insert</CODE>,
+and no check is performed.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>avl_replace</B> <I>(avl_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX61"></A>
+<DT><U>Function:</U> void * <B>avlt_replace</B> <I>(avlt_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX62"></A>
+<DT><U>Function:</U> void * <B>avltr_replace</B> <I>(avltr_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX63"></A>
+<DT><U>Function:</U> void * <B>rb_replace</B> <I>(rb_tree *<VAR>tree</VAR>, void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX64"></A>
+If a node with data matching <VAR>data</VAR>, such that the comparison
+function returns 0, exists in <VAR>tree</VAR>, replaces the node's data with
+<VAR>data</VAR> and returns the node's former contents. Otherwise, inserts
+<VAR>data</VAR> into <VAR>tree</VAR> and returns a null pointer.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>avl_delete</B> <I>(avl_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX65"></A>
+<DT><U>Function:</U> void * <B>avlt_delete</B> <I>(avlt_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX66"></A>
+<DT><U>Function:</U> void * <B>avltr_delete</B> <I>(avltr_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX67"></A>
+<DT><U>Function:</U> void * <B>rb_delete</B> <I>(rb_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX68"></A>
+Searches <VAR>tree</VAR> for a node with data matching <VAR>data</VAR>. If found,
+the node is deleted and its data is returned. Otherwise, returns a null
+pointer.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>avl_force_delete</B> <I>(avl_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX69"></A>
+<DT><U>Function:</U> void * <B>avlt_force_delete</B> <I>(avlt_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX70"></A>
+<DT><U>Function:</U> void * <B>avltr_force_delete</B> <I>(avltr_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX71"></A>
+<DT><U>Function:</U> void * <B>rb_force_delete</B> <I>(rb_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX72"></A>
+Deletes a node with data matching <VAR>data</VAR> from <VAR>tree</VAR>. If no
+matching node is found, aborts the program with an assertion violation.
+If macro <CODE>NDEBUG</CODE> is declared when a libavl header is included,
+these functions are short-circuited to a direct call to
+<CODE>avl_delete</CODE>, and no check is performed.
+</DL>
+
+</P>
+
+
+<H1><A NAME="SEC7" HREF="avl.html#TOC7">Searching</A></H1>
+
+<P>
+These function search a tree for an item without making an insertion or
+a deletion.
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>avl_find</B> <I>(avl_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX73"></A>
+<DT><U>Function:</U> void ** <B>avlt_find</B> <I>(avlt_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX74"></A>
+<DT><U>Function:</U> void ** <B>avltr_find</B> <I>(avltr_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX75"></A>
+<DT><U>Function:</U> void * <B>rb_find</B> <I>(rb_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX76"></A>
+Searches <VAR>tree</VAR> for a node with data matching <VAR>data</VAR>, If found,
+returns the node's data (for threaded and right-threaded trees, a
+pointer to the node's data). Otherwise, returns a null pointer.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>avl_find_close</B> <I>(avl_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX77"></A>
+<DT><U>Function:</U> void ** <B>avlt_find_close</B> <I>(avlt_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX78"></A>
+<DT><U>Function:</U> void ** <B>avltr_find_close</B> <I>(avltr_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX79"></A>
+<DT><U>Function:</U> void * <B>rb_find_close</B> <I>(rb_tree *<VAR>tree</VAR>, const void *<VAR>data</VAR>)</I>
+<DD><A NAME="IDX80"></A>
+Searches <VAR>tree</VAR> for a node with data matching <VAR>data</VAR>. If found,
+returns the node's data (for threaded and right-threaded trees, a
+pointer to the node's data). If no matching item is found, then it
+finds a node whose data is "close" to <VAR>data</VAR>; either the node
+closest in value to <VAR>data</VAR>, or the node either before or after the
+node with the closest value. Returns a null pointer if the tree does
+not contain any nodes.
+</DL>
+
+</P>
+
+
+<H1><A NAME="SEC8" HREF="avl.html#TOC8">Iteration</A></H1>
+
+<P>
+These functions allow the caller to iterate across the items in a tree.
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void <B>avl_walk</B> <I>(const avl_tree *<VAR>tree</VAR>, avl_node_func <VAR>operate</VAR>, void *<VAR>param</VAR>)</I>
+<DD><A NAME="IDX81"></A>
+<DT><U>Function:</U> void <B>avlt_walk</B> <I>(const avlt_tree *<VAR>tree</VAR>, avl_node_func <VAR>operate</VAR>, void *<VAR>param</VAR>)</I>
+<DD><A NAME="IDX82"></A>
+<DT><U>Function:</U> void <B>avltr_walk</B> <I>(const avltr_tree *<VAR>tree</VAR>, avl_node_func <VAR>operate</VAR>, void *<VAR>param</VAR>)</I>
+<DD><A NAME="IDX83"></A>
+<DT><U>Function:</U> void <B>rb_walk</B> <I>(const rb_tree *<VAR>tree</VAR>, avl_node_func <VAR>operate</VAR>, void *<VAR>param</VAR>)</I>
+<DD><A NAME="IDX84"></A>
+Walks through all the nodes in <VAR>tree</VAR>, and calls function
+<VAR>operate</VAR> for each node in inorder. <VAR>param</VAR> overrides the value
+passed to <CODE>avl_create</CODE> (and family) for this operation only.
+<VAR>operate</VAR> must not change the key data in the nodes in a way that
+would reorder the data values or cause two values to become equal.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>avl_traverse</B> <I>(const avl_tree *<VAR>tree</VAR>, avl_traverser *<VAR>trav</VAR>)</I>
+<DD><A NAME="IDX85"></A>
+<DT><U>Function:</U> void * <B>avlt_traverse</B> <I>(const avlt_tree *<VAR>tree</VAR>, avlt_traverser *<VAR>trav</VAR>)</I>
+<DD><A NAME="IDX86"></A>
+<DT><U>Function:</U> void * <B>avltr_traverse</B> <I>(const avltr_tree *<VAR>tree</VAR>, avltr_traverser *<VAR>trav</VAR>)</I>
+<DD><A NAME="IDX87"></A>
+<DT><U>Function:</U> void * <B>rb_traverse</B> <I>(const rb_tree *<VAR>tree</VAR>, rb_traverser *<VAR>trav</VAR>)</I>
+<DD><A NAME="IDX88"></A>
+Returns each of <VAR>tree</VAR>'s nodes' data values in sequence, then a null
+pointer to indicate the last item. <VAR>trav</VAR> must be initialized
+before the first call, either in a declaration like that below, or using
+one of the functions below.
+
+</P>
+
+<PRE>
+avl_traverser trav = AVL_TRAVERSER_INIT;
+</PRE>
+
+<P>
+Each <CODE>avl_traverser</CODE> (and family) is a separate, independent
+iterator.
+
+</P>
+<P>
+For threaded and right-threaded trees, <CODE>avlt_next</CODE> or
+<CODE>avltr_next</CODE>, respectively, are faster and more memory-efficient
+than <CODE>avlt_traverse</CODE> or <CODE>avltr_traverse</CODE>.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void * <B>avl_init_traverser</B> <I>(avl_traverser *<VAR>trav</VAR>)</I>
+<DD><A NAME="IDX89"></A>
+<DT><U>Function:</U> void * <B>avlt_init_traverser</B> <I>(avlt_traverser *<VAR>trav</VAR>)</I>
+<DD><A NAME="IDX90"></A>
+<DT><U>Function:</U> void * <B>avltr_init_traverser</B> <I>(avltr_traverser *<VAR>trav</VAR>)</I>
+<DD><A NAME="IDX91"></A>
+<DT><U>Function:</U> void * <B>rb_init_traverser</B> <I>(rb_traverser *<VAR>trav</VAR>)</I>
+<DD><A NAME="IDX92"></A>
+Initializes the specified tree traverser structure. After this function
+is called, the next call to the corresponding <CODE>*_traverse</CODE> function
+will return the smallest value in the appropriate tree.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void ** <B>avlt_next</B> <I>(const avlt_tree *<VAR>tree</VAR>, void **<VAR>data</VAR>)</I>
+<DD><A NAME="IDX93"></A>
+<DT><U>Function:</U> void ** <B>avltr_next</B> <I>(const avltr_tree *<VAR>tree</VAR>, void **<VAR>data</VAR>)</I>
+<DD><A NAME="IDX94"></A>
+<VAR>data</VAR> must be a null pointer or a pointer to a data item in AVL
+tree <VAR>tree</VAR>. Returns a pointer to the next data item after
+<VAR>data</VAR> in <VAR>tree</VAR> in inorder (this is the first item if
+<VAR>data</VAR> is a null pointer), or a null pointer if <VAR>data</VAR> was the
+last item in <VAR>tree</VAR>.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> void ** <B>avltr_prev</B> <I>(const avltr_tree *<VAR>tree</VAR>, void **<VAR>data</VAR>)</I>
+<DD><A NAME="IDX95"></A>
+<VAR>data</VAR> must be a null pointer or a pointer to a data item in AVL
+tree <VAR>tree</VAR>. Returns a pointer to the previous data item before
+<VAR>data</VAR> in <VAR>tree</VAR> in inorder (this is the last, or greatest
+valued, item if <VAR>data</VAR> is a null pointer), or a null pointer if
+<VAR>data</VAR> was the first item in <VAR>tree</VAR>.
+</DL>
+
+</P>
+
+
+<H1><A NAME="SEC9" HREF="avl.html#TOC9">Conversion</A></H1>
+
+<P>
+<DL>
+<DT><U>Function:</U> avlt_tree * <B>avlt_thread</B> <I>(avl_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX96"></A>
+<DT><U>Function:</U> avltr_tree * <B>avltr_thread</B> <I>(avl_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX97"></A>
+Adds symmetric threads or right threads, respectively, to unthreaded AVL
+tree <VAR>tree</VAR> and returns a pointer to <VAR>tree</VAR> cast to the
+appropriate type. After one of these functions is called, threaded or
+right-threaded functions, as appropriate, must be used with <VAR>tree</VAR>;
+unthreaded functions may not be used.
+</DL>
+
+</P>
+<P>
+<DL>
+<DT><U>Function:</U> avl_tree * <B>avlt_unthread</B> <I>(avlt_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX98"></A>
+<DT><U>Function:</U> avl_tree * <B>avltr_unthread</B> <I>(avltr_tree *<VAR>tree</VAR>)</I>
+<DD><A NAME="IDX99"></A>
+Cuts all threads in threaded or right-threaded, respectively, AVL tree
+<VAR>tree</VAR> and returns a pointer to <VAR>tree</VAR> cast to <CODE>avl_tree
+*</CODE>. After one of these functions is called, unthreaded functions must
+be used with <VAR>tree</VAR>; threaded or right-threaded functions may not be
+used.
+</DL>
+
+</P>
+
+
+<H1><A NAME="SEC10" HREF="avl.html#TOC10">Author</A></H1>
+
+<P>
+<A NAME="IDX100"></A>
+<A NAME="IDX101"></A>
+<A NAME="IDX102"></A>
+<A NAME="IDX103"></A>
+libavl was written by Ben Pfaff <A HREF="mailto:blp@gnu.org"><TT>blp@gnu.org</TT></A>.
+
+</P>
+<P>
+libavl's generic tree algorithms and AVL algorithms are based on those
+found in Donald Knuth's venerable <CITE>Art of Computer Programming</CITE>
+series from Addison-Wesley, primarily Volumes 1 and 3. libavl's
+red-black tree algorithms are based on those found in Cormen et al.,
+<CITE>Introduction to Algorithms</CITE>, 2nd ed., from MIT Press.
+
+</P>
+
+
+<H1><A NAME="SEC11" HREF="avl.html#TOC11">Index</A></H1>
+
+<P>
+<H2>a</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX7">Adel'son-Velskii, G. M.</A>
+<LI><A HREF="avl.html#IDX103"><CITE>Art of Computer Programming</CITE></A>
+<LI><A HREF="avl.html#IDX101">author</A>
+<LI><A HREF="avl.html#IDX4">AVL tree</A>
+<LI><A HREF="avl.html#IDX20">avl_comparison_func</A>
+<LI><A HREF="avl.html#IDX40">avl_copy</A>, <A HREF="avl.html#IDX41">avl_copy</A>, <A HREF="avl.html#IDX42">avl_copy</A>
+<LI><A HREF="avl.html#IDX22">avl_copy_func</A>
+<LI><A HREF="avl.html#IDX44">avl_count</A>
+<LI><A HREF="avl.html#IDX28">avl_create</A>
+<LI><A HREF="avl.html#IDX65">avl_delete</A>
+<LI><A HREF="avl.html#IDX32">avl_destroy</A>
+<LI><A HREF="avl.html#IDX73">avl_find</A>
+<LI><A HREF="avl.html#IDX77">avl_find_close</A>
+<LI><A HREF="avl.html#IDX69">avl_force_delete</A>
+<LI><A HREF="avl.html#IDX57">avl_force_insert</A>
+<LI><A HREF="avl.html#IDX36">avl_free</A>
+<LI><A HREF="avl.html#IDX89">avl_init_traverser</A>
+<LI><A HREF="avl.html#IDX53">avl_insert</A>
+<LI><A HREF="avl.html#IDX23">AVL_MAX_HEIGHT</A>
+<LI><A HREF="avl.html#IDX12">avl_node</A>
+<LI><A HREF="avl.html#IDX21">avl_node_func</A>
+<LI><A HREF="avl.html#IDX49">avl_probe</A>
+<LI><A HREF="avl.html#IDX61">avl_replace</A>
+<LI><A HREF="avl.html#IDX85">avl_traverse</A>
+<LI><A HREF="avl.html#IDX16">avl_traverser</A>
+<LI><A HREF="avl.html#IDX8">avl_tree</A>
+<LI><A HREF="avl.html#IDX81">avl_walk</A>
+<LI><A HREF="avl.html#IDX45">avlt_count</A>
+<LI><A HREF="avl.html#IDX29">avlt_create</A>
+<LI><A HREF="avl.html#IDX66">avlt_delete</A>
+<LI><A HREF="avl.html#IDX33">avlt_destroy</A>
+<LI><A HREF="avl.html#IDX74">avlt_find</A>
+<LI><A HREF="avl.html#IDX78">avlt_find_close</A>
+<LI><A HREF="avl.html#IDX70">avlt_force_delete</A>
+<LI><A HREF="avl.html#IDX58">avlt_force_insert</A>
+<LI><A HREF="avl.html#IDX37">avlt_free</A>
+<LI><A HREF="avl.html#IDX90">avlt_init_traverser</A>
+<LI><A HREF="avl.html#IDX54">avlt_insert</A>
+<LI><A HREF="avl.html#IDX93">avlt_next</A>
+<LI><A HREF="avl.html#IDX13">avlt_node</A>
+<LI><A HREF="avl.html#IDX50">avlt_probe</A>
+<LI><A HREF="avl.html#IDX62">avlt_replace</A>
+<LI><A HREF="avl.html#IDX96">avlt_thread</A>
+<LI><A HREF="avl.html#IDX86">avlt_traverse</A>
+<LI><A HREF="avl.html#IDX17">avlt_traverser</A>
+<LI><A HREF="avl.html#IDX9">avlt_tree</A>
+<LI><A HREF="avl.html#IDX98">avlt_unthread</A>
+<LI><A HREF="avl.html#IDX82">avlt_walk</A>
+<LI><A HREF="avl.html#IDX46">avltr_count</A>
+<LI><A HREF="avl.html#IDX30">avltr_create</A>
+<LI><A HREF="avl.html#IDX67">avltr_delete</A>
+<LI><A HREF="avl.html#IDX34">avltr_destroy</A>
+<LI><A HREF="avl.html#IDX75">avltr_find</A>
+<LI><A HREF="avl.html#IDX79">avltr_find_close</A>
+<LI><A HREF="avl.html#IDX71">avltr_force_delete</A>
+<LI><A HREF="avl.html#IDX59">avltr_force_insert</A>
+<LI><A HREF="avl.html#IDX38">avltr_free</A>
+<LI><A HREF="avl.html#IDX91">avltr_init_traverser</A>
+<LI><A HREF="avl.html#IDX55">avltr_insert</A>
+<LI><A HREF="avl.html#IDX94">avltr_next</A>
+<LI><A HREF="avl.html#IDX14">avltr_node</A>
+<LI><A HREF="avl.html#IDX95">avltr_prev</A>
+<LI><A HREF="avl.html#IDX51">avltr_probe</A>
+<LI><A HREF="avl.html#IDX63">avltr_replace</A>
+<LI><A HREF="avl.html#IDX97">avltr_thread</A>
+<LI><A HREF="avl.html#IDX87">avltr_traverse</A>
+<LI><A HREF="avl.html#IDX18">avltr_traverser</A>
+<LI><A HREF="avl.html#IDX10">avltr_tree</A>
+<LI><A HREF="avl.html#IDX99">avltr_unthread</A>
+<LI><A HREF="avl.html#IDX83">avltr_walk</A>
+</DIR>
+<H2>b</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX2">binary tree</A>
+</DIR>
+<H2>h</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX1">hash table</A>
+</DIR>
+<H2>k</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX102">Knuth, Donald Ervin</A>
+</DIR>
+<H2>l</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX6">Landis, E. M.</A>
+</DIR>
+<H2>p</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX100">Pfaff, Benjamin Levy</A>
+</DIR>
+<H2>r</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX43">rb_copy</A>
+<LI><A HREF="avl.html#IDX47">rb_count</A>
+<LI><A HREF="avl.html#IDX31">rb_create</A>
+<LI><A HREF="avl.html#IDX68">rb_delete</A>
+<LI><A HREF="avl.html#IDX35">rb_destroy</A>
+<LI><A HREF="avl.html#IDX76">rb_find</A>
+<LI><A HREF="avl.html#IDX80">rb_find_close</A>
+<LI><A HREF="avl.html#IDX72">rb_force_delete</A>
+<LI><A HREF="avl.html#IDX60">rb_force_insert</A>
+<LI><A HREF="avl.html#IDX39">rb_free</A>
+<LI><A HREF="avl.html#IDX92">rb_init_traverser</A>
+<LI><A HREF="avl.html#IDX56">rb_insert</A>
+<LI><A HREF="avl.html#IDX24">RB_MAX_HEIGHT</A>
+<LI><A HREF="avl.html#IDX15">rb_node</A>
+<LI><A HREF="avl.html#IDX52">rb_probe</A>
+<LI><A HREF="avl.html#IDX64">rb_replace</A>
+<LI><A HREF="avl.html#IDX88">rb_traverse</A>
+<LI><A HREF="avl.html#IDX19">rb_traverser</A>
+<LI><A HREF="avl.html#IDX11">rb_tree</A>
+<LI><A HREF="avl.html#IDX84">rb_walk</A>
+<LI><A HREF="avl.html#IDX5">rebalancing</A>
+<LI><A HREF="avl.html#IDX3">red-black tree</A>
+<LI><A HREF="avl.html#IDX27">right threads</A>
+</DIR>
+<H2>t</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX26">threads</A>
+</DIR>
+<H2>u</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX25">unthreaded</A>
+</DIR>
+<H2>x</H2>
+<DIR>
+<LI><A HREF="avl.html#IDX48">xmalloc</A>
+</DIR>
+
+</P>
+<P><HR><P>
+<H1>Footnotes</H1>
+<H3><A NAME="FOOT1" HREF="avl.html#DOCF1">(1)</A></H3>
+<P>In tree traversal, <STRONG>inorder</STRONG> refers
+to visiting the nodes in their sorted order from smallest to largest.
+<H3><A NAME="FOOT2" HREF="avl.html#DOCF2">(2)</A></H3>
+<P>In general, you
+should build the sort of tree that you need to use, but occasionally it
+is useful to convert between tree types.
+<H3><A NAME="FOOT3" HREF="avl.html#DOCF3">(3)</A></H3>
+<P>It
+can be changed if this would not change the ordering of the nodes in the
+tree; i.e., if this would not cause the data in the node to be less than
+or equal to the previous node's data or greater than or equal to the
+next node's data.
+<P><HR><P>
+This document was generated on 6 October 1999 using the
+<A HREF="http://wwwcn.cern.ch/dci/texi2html/">texi2html</A>
+translator version 1.51a.</P>
+</BODY>
+</HTML>