--- /dev/null
+*.a
+*.la
+*.lo
+*.log
+*.m4
+*.o
+*.stamp
+*.swp
+*.trs
+*~
+
+/.config.args
+/.libs/
+/*.tar.xz
+/Makefile
+/Makefile.in
+/autom4te.cache/
+/aclocal.m4
+/build-aux/
+/config.h
+/config.h.in
+/config.log
+/config.status
+/configure
+/libtool
+!/m4/attributes.m4
+/src/.deps/
+/src/.dirstamp
+/stamp-*
+/test-api
+/test-basic
--- /dev/null
+" 'set exrc' in ~/.vimrc will read .vimrc from the current directory
+set tabstop=8
+set shiftwidth=8
+set expandtab
--- /dev/null
+ GNU LESSER GENERAL PUBLIC LICENSE
+ Version 2.1, February 1999
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+ library `Frob' (a library for tweaking knobs) written by James Random Hacker.
+
+ <signature of Ty Coon>, 1 April 1990
+ Ty Coon, President of Vice
+
+That's all there is to it!
--- /dev/null
+# ------------------------------------------------------------------------------
+# main
+
+ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
+AM_MAKEFLAGS = --no-print-directory
+AUTOMAKE_OPTIONS = color-tests parallel-tests
+
+GCC_COLORS ?= 'ooh, shiny!'
+export GCC_COLORS
+
+SUBDIRS = .
+
+# remove targets if the command fails
+.DELETE_ON_ERROR:
+
+# keep intermediate files
+.SECONDARY:
+
+# Keep the test-suite.log and Makefile around at all times
+.PRECIOUS: $(TEST_SUITE_LOG) Makefile
+
+CLEANFILES = $(BUILT_SOURCES)
+DISTCLEANFILES =
+EXTRA_DIST =
+BUILT_SOURCES =
+lib_LTLIBRARIES =
+noinst_LTLIBRARIES =
+bin_PROGRAMS =
+noinst_PROGRAMS =
+check_PROGRAMS =
+TESTS =
+default_tests =
+
+AM_CPPFLAGS = \
+ -include $(top_builddir)/config.h \
+ -I $(top_srcdir)/src \
+ -I $(top_builddir)/src \
+ $(OUR_CPPFLAGS)
+
+AM_CFLAGS = $(OUR_CFLAGS)
+AM_LDFLAGS = $(OUR_LDFLAGS)
+
+# ------------------------------------------------------------------------------
+# libcrbtree-private (used for our tests, which access internal data)
+
+noinst_LTLIBRARIES += \
+ libcrbtree-private.la
+
+libcrbtree_private_la_SOURCES = \
+ src/crbtree.h \
+ src/crbtree-private.h \
+ src/crbtree.c
+
+libcrbtree_private_la_CFLAGS = \
+ $(AM_CFLAGS)
+
+libcrbtree_private_la_CPPFLAGS = \
+ $(AM_CPPFLAGS) \
+ -UNDEBUG
+
+libcrbtree_private_la_LDFLAGS = \
+ $(AM_LDFLAGS)
+
+# ------------------------------------------------------------------------------
+# libcrbtree
+
+lib_LTLIBRARIES += \
+ libcrbtree.la
+
+libcrbtree_la_SOURCES = \
+ $(libcrbtree_private_la_SOURCES)
+
+libcrbtree_la_CFLAGS = \
+ $(AM_CFLAGS)
+
+libcrbtree_la_CPPFLAGS = \
+ $(AM_CPPFLAGS)
+
+libcrbtree_la_LDFLAGS = \
+ $(AM_LDFLAGS) \
+ -version-info $(LIBCRBTREE_CURRENT):$(LIBCRBTREE_REVISION):$(LIBCRBTREE_AGE) \
+ -Wl,--version-script=$(top_srcdir)/src/libcrbtree.sym
+
+# ------------------------------------------------------------------------------
+# test-api
+
+default_tests += \
+ test-api
+
+test_api_SOURCES = \
+ src/test-api.c
+
+test_api_LDADD = \
+ libcrbtree.la # explicitly linked against public library
+
+# ------------------------------------------------------------------------------
+# test-basic
+
+default_tests += \
+ test-basic
+
+test_basic_SOURCES = \
+ src/test-basic.c
+
+test_basic_LDADD = \
+ libcrbtree-private.la
+
+# ------------------------------------------------------------------------------
+# test suite
+
+check_PROGRAMS += $(default_tests)
+TESTS += $(default_tests)
--- /dev/null
+#!/bin/sh
+
+set -e
+
+oldpwd=$(pwd)
+topdir=$(dirname $0)
+cd $topdir
+
+autoreconf --force --install --symlink
+
+if [ -f "$topdir/.config.args" ]; then
+ args="$args $(cat $topdir/.config.args)"
+fi
+
+cd $oldpwd
+
+if [ "x$1" = "xc" ]; then
+ $topdir/configure --enable-debug $args
+ make clean
+elif [ "x$1" = "xl" ]; then
+ $topdir/configure CC=clang $args
+ make clean
+else
+ echo
+ echo "----------------------------------------------------------------"
+ echo "Initialized build system. For a common configuration please run:"
+ echo "----------------------------------------------------------------"
+ echo
+ echo "$topdir/configure $args"
+ echo
+fi
--- /dev/null
+# ------------------------------------------------------------------------------
+# versions
+
+AC_PREREQ([2.64])
+
+AC_INIT([crbtree],
+ [1],
+ [http://www.github.com/dvdhrm/crbtree],
+ [crbtree],
+ [http://www.github.com/dvdhrm/crbtree])
+
+AC_SUBST([LIBCRBTREE_CURRENT], 0)
+AC_SUBST([LIBCRBTREE_AGE], 0)
+AC_SUBST([LIBCRBTREE_REVISION], 1)
+
+# ------------------------------------------------------------------------------
+# main
+
+AC_CONFIG_SRCDIR([src/crbtree.h])
+AC_CONFIG_MACRO_DIR([m4])
+AC_CONFIG_HEADERS([config.h])
+AC_CONFIG_AUX_DIR([build-aux])
+
+AC_USE_SYSTEM_EXTENSIONS
+AC_SYS_LARGEFILE
+AM_MAINTAINER_MODE([enable])
+AM_INIT_AUTOMAKE([foreign 1.11 -Wall -Wno-portability silent-rules tar-pax no-dist-gzip dist-xz subdir-objects parallel-tests])
+AM_SILENT_RULES([yes])
+AC_CANONICAL_HOST
+AC_DEFINE_UNQUOTED([CANONICAL_HOST], "$host", [Canonical host string.])
+
+AC_PROG_MKDIR_P
+AC_PROG_LN_S
+AC_PROG_SED
+AC_PROG_GREP
+AC_PROG_AWK
+AC_PROG_CC_C99
+
+LT_PREREQ(2.2)
+LT_INIT([disable-static])
+
+AC_PATH_PROG([M4], [m4])
+AC_PATH_PROG([XSLTPROC], [xsltproc])
+
+AS_IF([! ln --relative --help > /dev/null 2>&1], [AC_MSG_ERROR([*** ln doesn't support --relative ***])])
+
+# ------------------------------------------------------------------------------
+# arguments
+
+AC_ARG_ENABLE(debug, AS_HELP_STRING([--enable-debug], [enable debug options]))
+
+# ------------------------------------------------------------------------------
+# toolchain
+
+CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
+ -pipe \
+ -Wall \
+ -Wextra \
+ -Wno-inline \
+ -Wundef \
+ "-Wformat=2 -Wformat-security -Wformat-nonliteral" \
+ -Wlogical-op \
+ -Wsign-compare \
+ -Wmissing-include-dirs \
+ -Wold-style-definition \
+ -Wpointer-arith \
+ -Winit-self \
+ -Wdeclaration-after-statement \
+ -Wfloat-equal \
+ -Wsuggest-attribute=noreturn \
+ -Wmissing-prototypes \
+ -Wstrict-prototypes \
+ -Wredundant-decls \
+ -Wmissing-declarations \
+ -Wmissing-noreturn \
+ -Wshadow \
+ -Wendif-labels \
+ -Wstrict-aliasing=2 \
+ -Wwrite-strings \
+ -Wno-long-long \
+ -Wno-overlength-strings \
+ -Wno-unused-parameter \
+ -Wno-missing-field-initializers \
+ -Wno-unused-result \
+ -Werror=overflow \
+ -Wdate-time \
+ -Wnested-externs \
+ -ffast-math \
+ -fno-common \
+ -fdiagnostics-show-option \
+ -fno-strict-aliasing \
+ -fvisibility=hidden \
+ -ffunction-sections \
+ -fdata-sections \
+ -fstack-protector \
+ -fstack-protector-strong \
+ -fPIE \
+ --param=ssp-buffer-size=4])
+
+AS_CASE([$CC], [*clang*],
+ [CC_CHECK_FLAGS_APPEND([with_cppflags], [CPPFLAGS], [ \
+ -Wno-typedef-redefinition \
+ -Wno-gnu-variable-sized-type-not-at-end \
+ ])])
+
+CC_CHECK_FLAGS_APPEND([with_ldflags], [LDFLAGS], [\
+ -Wl,--as-needed \
+ -Wl,--no-undefined \
+ -Wl,--gc-sections \
+ -Wl,-z,relro \
+ -Wl,-z,now \
+ -pie])
+
+AS_IF([test "x$enable_debug" = "xyes"],
+ [
+ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [ \
+ -g \
+ -O0 \
+ -ftrapv])
+ ], [
+ CC_CHECK_FLAGS_APPEND([with_cppflags], [CPPFLAGS], [\
+ -Wp,-D_FORTIFY_SOURCE=2 \
+ -DNDEBUG])
+ ])
+
+AC_SUBST([OUR_CFLAGS], "$with_cflags")
+AC_SUBST([OUR_CPPFLAGS], "$with_cppflags")
+AC_SUBST([OUR_LDFLAGS], "$with_ldflags")
+
+# ------------------------------------------------------------------------------
+# system features
+
+# This makes sure pkg.m4 is available.
+m4_pattern_forbid([^_?PKG_[A-Z_]+$],[*** pkg.m4 missing, please install pkg-config])
+
+# ------------------------------------------------------------------------------
+# report
+
+AC_CONFIG_FILES([Makefile])
+
+AC_OUTPUT
+AC_MSG_RESULT([
+ $PACKAGE_NAME $VERSION ($LIBCRBTREE_CURRENT.$LIBCRBTREE_AGE.$LIBCRBTREE_REVISION)
+ debug: ${enable_debug}
+
+ prefix: ${prefix}
+ exec_prefix: ${exec_prefix}
+ includedir: ${includedir}
+ libdir: ${libdir}
+
+ CFLAGS: ${OUR_CFLAGS} ${CFLAGS}
+ CPPFLAGS: ${OUR_CPPFLAGS} ${CPPFLAGS}
+ LDFLAGS: ${OUR_LDFLAGS} ${LDFLAGS}
+])
--- /dev/null
+dnl Macros to check the presence of generic (non-typed) symbols.
+dnl Copyright (c) 2006-2008 Diego Pettenò <flameeyes@gmail.com>
+dnl Copyright (c) 2006-2008 xine project
+dnl Copyright (c) 2012 Lucas De Marchi <lucas.de.marchi@gmail.com>
+dnl
+dnl This program is free software; you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation; either version 2, or (at your option)
+dnl any later version.
+dnl
+dnl This program is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+dnl GNU General Public License for more details.
+dnl
+dnl You should have received a copy of the GNU General Public License
+dnl along with this program; if not, write to the Free Software
+dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+dnl 02110-1301, USA.
+dnl
+dnl As a special exception, the copyright owners of the
+dnl macro gives unlimited permission to copy, distribute and modify the
+dnl configure scripts that are the output of Autoconf when processing the
+dnl Macro. You need not follow the terms of the GNU General Public
+dnl License when using or distributing such scripts, even though portions
+dnl of the text of the Macro appear in them. The GNU General Public
+dnl License (GPL) does govern all other use of the material that
+dnl constitutes the Autoconf Macro.
+dnl
+dnl This special exception to the GPL applies to versions of the
+dnl Autoconf Macro released by this project. When you make and
+dnl distribute a modified version of the Autoconf Macro, you may extend
+dnl this special exception to the GPL to apply to your modified version as
+dnl well.
+
+dnl Check if FLAG in ENV-VAR is supported by compiler and append it
+dnl to WHERE-TO-APPEND variable. Note that we invert -Wno-* checks to
+dnl -W* as gcc cannot test for negated warnings.
+dnl CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG])
+
+AC_DEFUN([CC_CHECK_FLAG_APPEND], [
+ AC_CACHE_CHECK([if $CC supports flag $3 in envvar $2],
+ AS_TR_SH([cc_cv_$2_$3]),
+ [eval "AS_TR_SH([cc_save_$2])='${$2}'"
+ eval "AS_TR_SH([$2])='-Werror `echo "$3" | sed 's/^-Wno-/-W/'`'"
+ AC_LINK_IFELSE([AC_LANG_SOURCE([int main(void) { return 0; } ])],
+ [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"],
+ [eval "AS_TR_SH([cc_cv_$2_$3])='no'"])
+ eval "AS_TR_SH([$2])='$cc_save_$2'"])
+
+ AS_IF([eval test x$]AS_TR_SH([cc_cv_$2_$3])[ = xyes],
+ [eval "$1='${$1} $3'"])
+])
+
+dnl CC_CHECK_FLAGS_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG1 FLAG2])
+AC_DEFUN([CC_CHECK_FLAGS_APPEND], [
+ for flag in $3; do
+ CC_CHECK_FLAG_APPEND($1, $2, $flag)
+ done
+])
+
+dnl Check if the flag is supported by linker (cacheable)
+dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND])
+AC_DEFUN([CC_CHECK_LDFLAGS], [
+ AC_CACHE_CHECK([if $CC supports $1 flag],
+ AS_TR_SH([cc_cv_ldflags_$1]),
+ [ac_save_LDFLAGS="$LDFLAGS"
+ LDFLAGS="$LDFLAGS $1"
+ AC_LINK_IFELSE([int main() { return 1; }],
+ [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"],
+ [eval "AS_TR_SH([cc_cv_ldflags_$1])="])
+ LDFLAGS="$ac_save_LDFLAGS"
+ ])
+
+ AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes],
+ [$2], [$3])
+])
--- /dev/null
+#pragma once
+
+/***
+ This file is part of crbtree. See COPYING for details.
+
+ crbtree 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.
+
+ crbtree 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 crbtree; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+/*
+ * Private definitions
+ * This file contains private definitions for the RB-Tree implementation, but
+ * which are used by our test-suite.
+ */
+
+#include <stddef.h>
+#include "crbtree.h"
+
+/*
+ * Macros
+ */
+
+#define _public_ __attribute__((__visibility__("default")))
+
+/*
+ * Nodes
+ */
+
+enum {
+ C_RBNODE_RED = 0,
+ C_RBNODE_BLACK = 1,
+};
+
+static inline unsigned long c_rbnode_color(CRBNode *n) {
+ return (unsigned long)n->__parent_and_color & 1UL;
+}
+
+static inline _Bool c_rbnode_is_red(CRBNode *n) {
+ return c_rbnode_color(n) == C_RBNODE_RED;
+}
+
+static inline _Bool c_rbnode_is_black(CRBNode *n) {
+ return c_rbnode_color(n) == C_RBNODE_BLACK;
+}
--- /dev/null
+/***
+ This file is part of crbtree. See COPYING for details.
+
+ crbtree 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.
+
+ crbtree 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 crbtree; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+/*
+ * RB-Tree Implementation
+ * This implements the insertion/removal of elements in RB-Trees. You're highly
+ * recommended to have an RB-Tree documentation at hand when reading this. Both
+ * insertion and removal can be split into a handful of situations that can
+ * occur. Those situations are enumerated as "Case 1" to "Case n" here, and
+ * follow closely the cases described in most RB-Tree documentations. This file
+ * does not explain why it is enough to handle just those cases, nor does it
+ * provide a proof of correctness. Dig out your algorithm 101 handbook if
+ * you're interested.
+ *
+ * This implementation is *not* straightforward. Usually, a handful of
+ * rotation, reparent, swap and link helpers can be used to implement the
+ * rebalance operations. However, those often perform unnecessary writes.
+ * Therefore, this implementation hard-codes all the operations. You're highly
+ * recommended to look at the two basic helpers before reading the code:
+ * c_rbtree_swap_child()
+ * c_rbtree_set_parent_and_color()
+ * Those are the only helpers used, hence, you should really know what they do
+ * before digging into the code.
+ *
+ * For a highlevel documentation of the API, see the header file and docbook
+ * comments.
+ */
+
+#include <assert.h>
+#include <stddef.h>
+#include "crbtree.h"
+#include "crbtree-private.h"
+
+/**
+ * c_rbnode_leftmost() - return leftmost child
+ * @n: current node, or NULL
+ *
+ * This returns the leftmost child of @n. If @n is NULL, this will return NULL.
+ * In all other cases, this function returns a valid pointer. That is, if @n
+ * does not have any left children, this returns @n.
+ *
+ * Worst case runtime (n: number of elements in tree): O(log(n))
+ *
+ * Return: Pointer to leftmost child, or NULL.
+ */
+_public_ CRBNode *c_rbnode_leftmost(CRBNode *n) {
+ if (n)
+ while (n->left)
+ n = n->left;
+ return n;
+}
+
+/**
+ * c_rbnode_rightmost() - return rightmost child
+ * @n: current node, or NULL
+ *
+ * This returns the rightmost child of @n. If @n is NULL, this will return
+ * NULL. In all other cases, this function returns a valid pointer. That is, if
+ * @n does not have any right children, this returns @n.
+ *
+ * Worst case runtime (n: number of elements in tree): O(log(n))
+ *
+ * Return: Pointer to rightmost child, or NULL.
+ */
+_public_ CRBNode *c_rbnode_rightmost(CRBNode *n) {
+ if (n)
+ while (n->right)
+ n = n->right;
+ return n;
+}
+
+/**
+ * c_rbnode_next() - return next node
+ * @n: current node, or NULL
+ *
+ * An RB-Tree always defines a linear order of its elements. This function
+ * returns the logically next node to @n. If @n is NULL, the last node or
+ * unlinked, this returns NULL.
+ *
+ * Worst case runtime (n: number of elements in tree): O(log(n))
+ *
+ * Return: Pointer to next node, or NULL.
+ */
+_public_ CRBNode *c_rbnode_next(CRBNode *n) {
+ CRBNode *p;
+
+ if (!c_rbnode_is_linked(n))
+ return NULL;
+ if (n->right)
+ return c_rbnode_leftmost(n->right);
+
+ while ((p = c_rbnode_parent(n)) && n == p->right)
+ n = p;
+
+ return p;
+}
+
+/**
+ * c_rbnode_prev() - return previous node
+ * @n: current node, or NULL
+ *
+ * An RB-Tree always defines a linear order of its elements. This function
+ * returns the logically previous node to @n. If @n is NULL, the first node or
+ * unlinked, this returns NULL.
+ *
+ * Worst case runtime (n: number of elements in tree): O(log(n))
+ *
+ * Return: Pointer to previous node, or NULL.
+ */
+_public_ CRBNode *c_rbnode_prev(CRBNode *n) {
+ CRBNode *p;
+
+ if (!c_rbnode_is_linked(n))
+ return NULL;
+ if (n->left)
+ return c_rbnode_rightmost(n->left);
+
+ while ((p = c_rbnode_parent(n)) && n == p->left)
+ n = p;
+
+ return p;
+}
+
+/**
+ * c_rbtree_first() - return first node
+ * @t: tree to operate on
+ *
+ * An RB-Tree always defines a linear order of its elements. This function
+ * returns the logically first node in @t. If @t is empty, NULL is returned.
+ *
+ * Fixed runtime (n: number of elements in tree): O(log(n))
+ *
+ * Return: Pointer to first node, or NULL.
+ */
+_public_ CRBNode *c_rbtree_first(CRBTree *t) {
+ assert(t);
+ return c_rbnode_leftmost(t->root);
+}
+
+/**
+ * c_rbtree_last() - return last node
+ * @t: tree to operate on
+ *
+ * An RB-Tree always defines a linear order of its elements. This function
+ * returns the logically last node in @t. If @t is empty, NULL is returned.
+ *
+ * Fixed runtime (n: number of elements in tree): O(log(n))
+ *
+ * Return: Pointer to last node, or NULL.
+ */
+_public_ CRBNode *c_rbtree_last(CRBTree *t) {
+ assert(t);
+ return c_rbnode_rightmost(t->root);
+}
+
+/*
+ * Set the color and parent of a node. This should be treated as a simple
+ * assignment of the 'color' and 'parent' fields of the node. No other magic is
+ * applied. But since both fields share its backing memory, this helper
+ * function is provided.
+ */
+static inline void c_rbnode_set_parent_and_color(CRBNode *n, CRBNode *p, unsigned long c) {
+ assert(!((unsigned long)p & 1));
+ assert(c < 2);
+ n->__parent_and_color = (CRBNode*)((unsigned long)p | c);
+}
+
+/* same as c_rbnode_set_parent_and_color(), but keeps the current parent */
+static inline void c_rbnode_set_color(CRBNode *n, unsigned long c) {
+ c_rbnode_set_parent_and_color(n, c_rbnode_parent(n), c);
+}
+
+/* same as c_rbnode_set_parent_and_color(), but keeps the current color */
+static inline void c_rbnode_set_parent(CRBNode *n, CRBNode *p) {
+ c_rbnode_set_parent_and_color(n, p, c_rbnode_color(n));
+}
+
+/*
+ * This function partially replaces an existing child pointer to a new one. The
+ * existing child must be given as @old, the new child as @new. @p must be the
+ * parent of @old (or NULL if it has no parent).
+ * This function ensures that the parent of @old now points to @new. However,
+ * it does *NOT* change the parent pointer of @new. The caller must ensure
+ * this.
+ * If @p is NULL, this function ensures that the root-pointer is adjusted
+ * instead (given as @t).
+ */
+static inline void c_rbtree_swap_child(CRBTree *t, CRBNode *p, CRBNode *old, CRBNode *new) {
+ if (p) {
+ if (p->left == old)
+ p->left = new;
+ else
+ p->right = new;
+ } else {
+ t->root = new;
+ }
+}
+
+static inline CRBNode *c_rbtree_paint_one(CRBTree *t, CRBNode *n) {
+ CRBNode *p, *g, *gg, *u, *x;
+
+ /*
+ * Paint a single node according to RB-Tree rules. The node must
+ * already be linked into the tree and painted red.
+ * We repaint the node or rotate the tree, if required. In case a
+ * recursive repaint is required, the next node to be re-painted
+ * is returned.
+ * p: parent
+ * g: grandparent
+ * gg: grandgrandparent
+ * u: uncle
+ * x: temporary
+ */
+
+ /* node is red, so we can access the parent directly */
+ p = n->__parent_and_color;
+
+ if (!p) {
+ /* Case 1:
+ * We reached the root. Mark it black and be done. As all
+ * leaf-paths share the root, the ratio of black nodes on each
+ * path stays the same. */
+ c_rbnode_set_parent_and_color(n, p, C_RBNODE_BLACK);
+ n = NULL;
+ } else if (c_rbnode_is_black(p)) {
+ /* Case 2:
+ * The parent is already black. As our node is red, we did not
+ * change the number of black nodes on any path, nor do we have
+ * multiple consecutive red nodes. */
+ n = NULL;
+ } else if (p == p->__parent_and_color->left) { /* parent is red, so grandparent exists */
+ g = p->__parent_and_color;
+ gg = c_rbnode_parent(g);
+ u = g->right;
+
+ if (u && c_rbnode_is_red(u)) {
+ /* Case 3:
+ * Parent and uncle are both red. We know the
+ * grandparent must be black then. Repaint parent and
+ * uncle black, the grandparent red and recurse into
+ * the grandparent. */
+ c_rbnode_set_parent_and_color(p, g, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(u, g, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(g, gg, C_RBNODE_RED);
+ n = g;
+ } else {
+ /* parent is red, uncle is black */
+
+ if (n == p->right) {
+ /* Case 4:
+ * We're the right child. Rotate on parent to
+ * become left child, so we can handle it the
+ * same as case 5. */
+ x = n->left;
+ p->right = n->left;
+ n->left = p;
+ if (x)
+ c_rbnode_set_parent_and_color(x, p, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(p, n, C_RBNODE_RED);
+ p = n;
+ }
+
+ /* 'n' is invalid from here on! */
+ n = NULL;
+
+ /* Case 5:
+ * We're the red left child or a red parent, black
+ * grandparent and uncle. Rotate on grandparent and
+ * switch color with parent. Number of black nodes on
+ * each path stays the same, but we got rid of the
+ * double red path. As the grandparent is still black,
+ * we're done. */
+ x = p->right;
+ g->left = x;
+ p->right = g;
+ if (x)
+ c_rbnode_set_parent_and_color(x, g, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(p, gg, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(g, p, C_RBNODE_RED);
+ c_rbtree_swap_child(t, gg, g, p);
+ }
+ } else /* if (p == p->__parent_and_color->left) */ { /* same as above, but mirrored */
+ g = p->__parent_and_color;
+ gg = c_rbnode_parent(g);
+ u = g->left;
+
+ if (u && c_rbnode_is_red(u)) {
+ c_rbnode_set_parent_and_color(p, g, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(u, g, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(g, gg, C_RBNODE_RED);
+ n = g;
+ } else {
+ if (n == p->left) {
+ x = n->right;
+ p->left = n->right;
+ n->right = p;
+ if (x)
+ c_rbnode_set_parent_and_color(x, p, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(p, n, C_RBNODE_RED);
+ p = n;
+ }
+
+ n = NULL;
+
+ x = p->left;
+ g->right = x;
+ p->left = g;
+ if (x)
+ c_rbnode_set_parent_and_color(x, g, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(p, gg, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(g, p, C_RBNODE_RED);
+ c_rbtree_swap_child(t, gg, g, p);
+ }
+ }
+
+ return n;
+}
+
+static inline void c_rbtree_paint(CRBTree *t, CRBNode *n) {
+ assert(t);
+ assert(n);
+
+ while (n)
+ n = c_rbtree_paint_one(t, n);
+}
+
+/**
+ * c_rbtree_add() - add node to tree
+ * @t: tree to operate one
+ * @p: parent node to link under, or NULL
+ * @l: left/right slot of @p (or root) to link at
+ * @n: node to add
+ *
+ * This links @n into the tree given as @t. The caller must provide the exact
+ * spot where to link the node. That is, the caller must traverse the tree
+ * based on their search order. Once they hit a leaf where to insert the node,
+ * call this function to link it and rebalance the tree.
+ *
+ * A typical insertion would look like this (@t is your tree, @n is your node):
+ *
+ * CRBNode **i, *p;
+ *
+ * i = &t->root;
+ * p = NULL;
+ * while (*i) {
+ * p = *i;
+ * if (compare(n, *i) < 0)
+ * i = &(*i)->left;
+ * else
+ * i = &(*i)->right;
+ * }
+ *
+ * c_rbtree_add(t, p, i, n);
+ *
+ * Once the node is linked into the tree, a simple lookup on the same tree can
+ * be coded like this:
+ *
+ * CRBNode *i;
+ *
+ * i = t->root;
+ * while (i) {
+ * int v = compare(n, i);
+ * if (v < 0)
+ * i = (*i)->left;
+ * else if (v > 0)
+ * i = (*i)->right;
+ * else
+ * break;
+ * }
+ *
+ * When you add nodes to a tree, the memory contents of the node do not matter.
+ * That is, there is no need to initialize the node via c_rbnode_init().
+ * However, if you relink nodes multiple times during their lifetime, it is
+ * usually very convenient to use c_rbnode_init() and c_rbtree_remove_init().
+ * In those cases, you should validate that a node is unlinked before you call
+ * c_rbtree_add().
+ */
+_public_ void c_rbtree_add(CRBTree *t, CRBNode *p, CRBNode **l, CRBNode *n) {
+ assert(t);
+ assert(l);
+ assert(n);
+ assert(!p || l == &p->left || l == &p->right);
+ assert(p || l == &t->root);
+
+ c_rbnode_set_parent_and_color(n, p, C_RBNODE_RED);
+ n->left = n->right = NULL;
+ *l = n;
+
+ c_rbtree_paint(t, n);
+}
+
+static inline CRBNode *c_rbtree_rebalance_one(CRBTree *t, CRBNode *p, CRBNode *n) {
+ CRBNode *s, *x, *y, *g;
+
+ /*
+ * Rebalance tree after a node was removed. This happens only if you
+ * remove a black node and one path is now left with an unbalanced
+ * number or black nodes.
+ * This function assumes all paths through p and n have one black node
+ * less than all other paths. If recursive fixup is required, the
+ * current node is returned.
+ */
+
+ if (n == p->left) {
+ s = p->right;
+ if (c_rbnode_is_red(s)) {
+ /* Case 3:
+ * We have a red node as sibling. Rotate it onto our
+ * side so we can later on turn it black. This way, we
+ * gain the additional black node in our path. */
+ g = c_rbnode_parent(p);
+ x = s->left;
+ p->right = x;
+ s->left = p;
+ c_rbnode_set_parent_and_color(x, p, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(s, g, c_rbnode_color(p));
+ c_rbnode_set_parent_and_color(p, s, C_RBNODE_RED);
+ c_rbtree_swap_child(t, g, p, s);
+ s = x;
+ }
+
+ x = s->right;
+ if (!x || c_rbnode_is_black(x)) {
+ y = s->left;
+ if (!y || c_rbnode_is_black(y)) {
+ /* Case 4:
+ * Our sibling is black and has only black
+ * children. Flip it red and turn parent black.
+ * This way we gained a black node in our path,
+ * or we fix it recursively one layer up, which
+ * will rotate the red sibling as parent. */
+ c_rbnode_set_parent_and_color(s, p, C_RBNODE_RED);
+ if (c_rbnode_is_black(p))
+ return p;
+
+ c_rbnode_set_parent_and_color(p, c_rbnode_parent(p), C_RBNODE_BLACK);
+ return NULL;
+ }
+
+ /* Case 5:
+ * Left child of our sibling is red, right one is black.
+ * Rotate on parent so the right child of our sibling is
+ * now red, and we can fall through to case 6. */
+ x = y->right;
+ s->left = y->right;
+ y->right = s;
+ p->right = y;
+ if (x)
+ c_rbnode_set_parent_and_color(x, s, C_RBNODE_BLACK);
+ x = s;
+ s = y;
+ }
+
+ /* Case 6:
+ * The right child of our sibling is red. Rotate left and flip
+ * colors, which gains us an additional black node in our path,
+ * that was previously on our sibling. */
+ g = c_rbnode_parent(p);
+ y = s->left;
+ p->right = y;
+ s->left = p;
+ c_rbnode_set_parent_and_color(x, s, C_RBNODE_BLACK);
+ if (y)
+ c_rbnode_set_parent_and_color(y, p, c_rbnode_color(y));
+ c_rbnode_set_parent_and_color(s, g, c_rbnode_color(p));
+ c_rbnode_set_parent_and_color(p, s, C_RBNODE_BLACK);
+ c_rbtree_swap_child(t, g, p, s);
+ } else /* if (!n || n == p->right) */ { /* same as above, but mirrored */
+ s = p->left;
+ if (c_rbnode_is_red(s)) {
+ g = c_rbnode_parent(p);
+ x = s->right;
+ p->left = x;
+ s->right = p;
+ c_rbnode_set_parent_and_color(x, p, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(s, g, C_RBNODE_BLACK);
+ c_rbnode_set_parent_and_color(p, s, C_RBNODE_RED);
+ c_rbtree_swap_child(t, g, p, s);
+ s = x;
+ }
+
+ x = s->left;
+ if (!x || c_rbnode_is_black(x)) {
+ y = s->right;
+ if (!y || c_rbnode_is_black(y)) {
+ c_rbnode_set_parent_and_color(s, p, C_RBNODE_RED);
+ if (c_rbnode_is_black(p))
+ return p;
+
+ c_rbnode_set_parent_and_color(p, c_rbnode_parent(p), C_RBNODE_BLACK);
+ return NULL;
+ }
+
+ x = y->left;
+ s->right = y->left;
+ y->left = s;
+ p->left = y;
+ if (x)
+ c_rbnode_set_parent_and_color(x, s, C_RBNODE_BLACK);
+ x = s;
+ s = y;
+ }
+
+ g = c_rbnode_parent(p);
+ y = s->right;
+ p->left = y;
+ s->right = p;
+ c_rbnode_set_parent_and_color(x, s, C_RBNODE_BLACK);
+ if (y)
+ c_rbnode_set_parent_and_color(y, p, c_rbnode_color(y));
+ c_rbnode_set_parent_and_color(s, g, c_rbnode_color(p));
+ c_rbnode_set_parent_and_color(p, s, C_RBNODE_BLACK);
+ c_rbtree_swap_child(t, g, p, s);
+ }
+
+ return NULL;
+}
+
+static inline void c_rbtree_rebalance(CRBTree *t, CRBNode *p) {
+ CRBNode *n = NULL;
+
+ assert(t);
+ assert(p);
+
+ do {
+ n = c_rbtree_rebalance_one(t, p, n);
+ p = n ? c_rbnode_parent(n) : NULL;
+ } while (p);
+}
+
+/**
+ * c_rbtree_remove() - remove node from tree
+ * @t: tree to operate one
+ * @n: node to remove
+ *
+ * This removes the given node from its tree. Once unlinked, the tree is
+ * rebalanced.
+ * The caller *must* ensure that the given tree is actually the tree it is
+ * linked on. Otherwise, behavior is undefined.
+ *
+ * This does *NOT* reset @n to being unlinked (for performance reason, this
+ * function *never* modifies @n at all). If you need this, use
+ * c_rbtree_remove_init().
+ */
+_public_ void c_rbtree_remove(CRBTree *t, CRBNode *n) {
+ CRBNode *p, *s, *gc, *x, *next = NULL;
+ unsigned long c;
+
+ assert(t);
+ assert(n);
+ assert(c_rbnode_is_linked(n));
+
+ /*
+ * There are three distinct cases during node removal of a tree:
+ * * The node has no children, in which case it can simply be removed.
+ * * The node has exactly one child, in which case the child displaces
+ * its parent.
+ * * The node has two children, in which case there is guaranteed to
+ * be a successor to the node (successor being the node ordered
+ * directly after it). This successor cannot have two children by
+ * itself (two interior nodes can never be successive). Therefore,
+ * we can simply swap the node with its successor (including color)
+ * and have reduced this case to either of the first two.
+ *
+ * Whenever the node we removed was black, we have to rebalance the
+ * tree. Note that this affects the actual node we _remove_, not @n (in
+ * case we swap it).
+ *
+ * p: parent
+ * s: successor
+ * gc: grand-...-child
+ * x: temporary
+ * next: next node to rebalance on
+ */
+
+ if (!n->left) {
+ /*
+ * Case 1:
+ * The node has no left child. If it neither has a right child,
+ * it is a leaf-node and we can simply unlink it. If it also
+ * was black, we have to rebalance, as always if we remove a
+ * black node.
+ * But if the node has a right child, the child *must* be red
+ * (otherwise, the right path has more black nodes as the
+ * non-existing left path), and the node to be removed must
+ * hence be black. We simply replace the node with its child,
+ * turning the red child black, and thus no rebalancing is
+ * required.
+ */
+ p = c_rbnode_parent(n);
+ c = c_rbnode_color(n);
+ c_rbtree_swap_child(t, p, n, n->right);
+ if (n->right)
+ c_rbnode_set_parent_and_color(n->right, p, c);
+ else
+ next = (c == C_RBNODE_BLACK) ? p : NULL;
+ } else if (!n->right) {
+ /*
+ * Case 1.1:
+ * The node has exactly one child, and it is on the left. Treat
+ * it as mirrored case of Case 1 (i.e., replace the node by its
+ * child).
+ */
+ p = c_rbnode_parent(n);
+ c = c_rbnode_color(n);
+ c_rbtree_swap_child(t, p, n, n->left);
+ c_rbnode_set_parent_and_color(n->left, p, c);
+ } else {
+ /*
+ * Case 2:
+ * We are dealing with a full interior node with a child not on
+ * both sides. Find its successor and swap it. Then remove the
+ * node similar to Case 1. For performance reasons we don't
+ * perform the full swap, but skip links that are about to be
+ * removed, anyway.
+ */
+ s = n->right;
+ if (!s->left) {
+ /* right child is next, no need to touch grandchild */
+ p = s;
+ gc = s->right;
+ } else {
+ /* find successor and swap partially */
+ s = c_rbnode_leftmost(s);
+ p = c_rbnode_parent(s);
+
+ gc = s->right;
+ p->left = s->right;
+ s->right = n->right;
+ c_rbnode_set_parent(n->right, s);
+ }
+
+ /* node is partially swapped, now remove as in Case 1 */
+ s->left = n->left;
+ c_rbnode_set_parent(n->left, s);
+
+ x = c_rbnode_parent(n);
+ c = c_rbnode_color(n);
+ c_rbtree_swap_child(t, x, n, s);
+ if (gc)
+ c_rbnode_set_parent_and_color(gc, p, C_RBNODE_BLACK);
+ else
+ next = c_rbnode_is_black(s) ? p : NULL;
+ c_rbnode_set_parent_and_color(s, x, c);
+ }
+
+ if (next)
+ c_rbtree_rebalance(t, next);
+}
--- /dev/null
+#pragma once
+
+/***
+ This file is part of crbtree. See COPYING for details.
+
+ crbtree 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.
+
+ crbtree 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 crbtree; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+/**
+ * Standalone Red-Black-Tree Implementation in Standard ISO-C11
+ *
+ * This header provides an RB-Tree API, that is fully implemented in ISO-C11
+ * and has no external dependencies. Furthermore, tree traversal, memory
+ * allocations, and key comparisons a fully in control of the API user. The
+ * implementation only provides the RB-Tree specific rebalancing and coloring.
+ *
+ * A tree is represented by the "CRBTree" structure. It contains a *singly*
+ * field, which is a pointer to the root node. If NULL, the tree is empty. If
+ * non-NULL, there is at least a single element in the tree.
+ *
+ * Each node of the tree is represented by the "CRBNode" structure. It has
+ * three fields. The @left and @right members can be accessed by the API user
+ * directly to traverse the tree. The third member is an implementation detail
+ * and encodes the parent pointer and color of the node.
+ * API users are required to embed the CRBNode object into their own objects
+ * and then use offsetof() (i.e., container_of() and friends) to turn CRBNode
+ * pointers into pointers to their own structure.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct CRBNode CRBNode;
+typedef struct CRBTree CRBTree;
+
+/**
+ * struct CRBNode - Node of a Red-Black Tree
+ * @__parent_and_color: internal state
+ * @left: left child, or NULL
+ * @right: right child, or NULL
+ *
+ * Each node in an RB-Tree must embed an CRBNode object. This object contains
+ * pointers to its left and right child, which can be freely accessed by the
+ * API user at any time. They are NULL, if the node does not have a left/right
+ * child
+ *
+ * The @__parent_and_color field must never be accessed directly. It encodes
+ * the pointer to the parent node, and the color of the node. Use the accessor
+ * functions instead.
+ *
+ * There is no reason to initialize a CRBNode object before linking it.
+ * However, if you need a boolean state that tells you whether the node is
+ * linked or not, you should initialize the node via c_rbnode_init() or
+ * C_RBNODE_INIT.
+ */
+struct CRBNode {
+ CRBNode *__parent_and_color;
+ CRBNode *left;
+ CRBNode *right;
+};
+
+#define C_RBNODE_INIT(_var) { .__parent_and_color = &(_var) }
+
+CRBNode *c_rbnode_leftmost(CRBNode *n);
+CRBNode *c_rbnode_rightmost(CRBNode *n);
+CRBNode *c_rbnode_next(CRBNode *n);
+CRBNode *c_rbnode_prev(CRBNode *n);
+
+/**
+ * struct CRBTree - Red-Black Tree
+ * @root: pointer to the root node, or NULL
+ *
+ * Each Red-Black Tree is rooted in an CRBTree object. This object contains a
+ * pointer to the root node of the tree. The API user is free to access the
+ * @root member at any time, and use it to traverse the tree.
+ *
+ * To initialize an RB-Tree, set it to NULL / all zero.
+ */
+struct CRBTree {
+ CRBNode *root;
+};
+
+CRBNode *c_rbtree_first(CRBTree *t);
+CRBNode *c_rbtree_last(CRBTree *t);
+
+void c_rbtree_add(CRBTree *t, CRBNode *p, CRBNode **l, CRBNode *n);
+void c_rbtree_remove(CRBTree *t, CRBNode *n);
+
+/* inline shortcuts */
+
+/**
+ * c_rbnode_init() - mark a node as unlinked
+ * @n: node to operate on
+ *
+ * This marks the node @n as unlinked. The node will be set to a valid state
+ * that can never happen if the node is linked in a tree. Furthermore, this
+ * state is fully known to the implementation, and as such handled gracefully
+ * in all cases.
+ *
+ * You are *NOT* required to call this on your node. c_rbtree_add() can handle
+ * uninitialized nodes just fine. However, calling this allows to use
+ * c_rbnode_is_linked() to check for the state of a node. Furthermore,
+ * iterators and accessors can be called on initialized (yet unlinked) nodes.
+ *
+ * Use the C_RBNODE_INIT macro if you want to initialize static variables.
+ */
+static inline void c_rbnode_init(CRBNode *n) {
+ *n = (CRBNode)C_RBNODE_INIT(*n);
+}
+
+/**
+ * c_rbnode_is_linked() - check whether a node is linked
+ * @n: node to check, or NULL
+ *
+ * This checks whether the passed node is linked. If you pass NULL, or if the
+ * node is not linked into a tree, this will return false. Otherwise, this
+ * returns true.
+ *
+ * Note that you must have either linked the node or initialized it, before
+ * calling this function. Never call this function on uninitialized nodes.
+ * Furthermore, removing a node via c_rbtree_remove() does *NOT* mark the node
+ * as unlinked. You have to call c_rbnode_init() yourself after removal, or use
+ * the c_rbtree_remove_init() helper.
+ *
+ * Return: true if the node is linked, false if not.
+ */
+static inline _Bool c_rbnode_is_linked(CRBNode *n) {
+ return n && n->__parent_and_color != n;
+}
+
+/**
+ * c_rbnode_parent() - return parent pointer
+ * @n node to access
+ *
+ * This returns a pointer to the parent of the given node @n. If @n does not
+ * have a parent, NULL is returned. If @n is not linked, @n itself is returned.
+ *
+ * You should not call this on unlinked or uninitialized nodes! If you do, you
+ * better know how its semantics.
+ *
+ * Return: Pointer to parent.
+ */
+static inline CRBNode *c_rbnode_parent(CRBNode *n) {
+ return (CRBNode*)((unsigned long)n->__parent_and_color & ~1UL);
+}
+
+/**
+ * c_rbtree_remove_init() - safely remove node from tree and reinitialize it
+ * @t: tree to operate on
+ * @n: node to remove, or NULL
+ *
+ * This is almost the same as c_rbtree_remove(), but extends it slightly, to be
+ * more convenient to use in many cases:
+ * - if @n is unlinked or NULL, this is a no-op
+ * - @n is reinitialized after being removed
+ */
+static inline void c_rbtree_remove_init(CRBTree *t, CRBNode *n) {
+ if (c_rbnode_is_linked(n)) {
+ c_rbtree_remove(t, n);
+ c_rbnode_init(n);
+ }
+}
+
+#ifdef __cplusplus
+}
+#endif
--- /dev/null
+/***
+ This file is part of crbtree. See COPYING for details.
+
+ crbtree 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.
+
+ crbtree 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 crbtree; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+LIBCRBTREE_1 {
+global:
+ c_rbnode_leftmost;
+ c_rbnode_rightmost;
+ c_rbnode_next;
+ c_rbnode_prev;
+ c_rbtree_first;
+ c_rbtree_last;
+ c_rbtree_add;
+ c_rbtree_remove;
+local:
+ *;
+};
--- /dev/null
+/***
+ This file is part of crbtree. See COPYING for details.
+
+ crbtree 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.
+
+ crbtree 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 crbtree; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+/*
+ * Tests for Public API
+ * This test, unlikely the others, is linked against the real, distributed,
+ * shared library. Its sole purpose is to test for symbol availability.
+ */
+
+#undef NDEBUG
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "crbtree.h"
+
+static void test_api(void) {
+ CRBTree t = {};
+ CRBNode n = C_RBNODE_INIT(n);
+
+ assert(!c_rbnode_is_linked(&n));
+
+ /* init, is_linked, add, remove, remove_init */
+
+ c_rbtree_add(&t, NULL, &t.root, &n);
+ assert(c_rbnode_is_linked(&n));
+
+ c_rbtree_remove_init(&t, &n);
+ assert(!c_rbnode_is_linked(&n));
+
+ c_rbtree_add(&t, NULL, &t.root, &n);
+ assert(c_rbnode_is_linked(&n));
+
+ c_rbtree_remove(&t, &n);
+ assert(c_rbnode_is_linked(&n)); /* @n wasn't touched */
+
+ c_rbnode_init(&n);
+ assert(!c_rbnode_is_linked(&n));
+
+ /* first, last, leftmost, rightmost, next, prev */
+
+ assert(!c_rbtree_first(&t));
+ assert(!c_rbtree_last(&t));
+ assert(&n == c_rbnode_leftmost(&n));
+ assert(&n == c_rbnode_rightmost(&n));
+ assert(!c_rbnode_next(&n));
+ assert(!c_rbnode_prev(&n));
+}
+
+int main(int argc, char **argv) {
+ test_api();
+ return 0;
+}
--- /dev/null
+/***
+ This file is part of crbtree. See COPYING for details.
+
+ crbtree 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.
+
+ crbtree 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 crbtree; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+/*
+ * Tests for Basic Tree Operations
+ * This test does some basic tree operations and verifies their correctness. It
+ * validates the RB-Tree invariants after each operation, to guarantee the
+ * stability of the tree. The tree operations performed are pseudo-random, and
+ * test all code-paths (see coverage report). However, full coverage does not
+ * necessarily guarantee absolute testing, so there are also some fixed tests
+ * for known special cases.
+ *
+ * For testing purposes, we use the memory address of a node as its key, and
+ * order nodes in ascending order.
+ */
+
+#undef NDEBUG
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "crbtree.h"
+#include "crbtree-private.h"
+
+static size_t validate(CRBTree *t) {
+ unsigned int i_black, n_black;
+ CRBNode *n, *p, *o;
+ size_t count = 0;
+
+ assert(t);
+ assert(!t->root || c_rbnode_is_black(t->root));
+
+ /* traverse to left-most child, count black nodes */
+ i_black = 0;
+ n = t->root;
+ while (n && n->left) {
+ if (c_rbnode_is_black(n))
+ ++i_black;
+ n = n->left;
+ }
+ n_black = i_black;
+
+ /*
+ * Traverse tree and verify correctness:
+ * 1) A node is either red or black
+ * 2) The root is black
+ * 3) All leaves are black
+ * 4) Every red node must have two black child nodes
+ * 5) Every path to a leaf contains the same number of black nodes
+ *
+ * Note that NULL nodes are considered black, which is why we don't
+ * check for 3).
+ */
+ o = NULL;
+ while (n) {
+ ++count;
+
+ /* verify natural order */
+ assert(n > o);
+ o = n;
+
+ /* verify consistency */
+ assert(!n->right || c_rbnode_parent(n->right) == n);
+ assert(!n->left || c_rbnode_parent(n->left) == n);
+
+ /* verify 2) */
+ if (!c_rbnode_parent(n))
+ assert(c_rbnode_is_black(n));
+
+ if (c_rbnode_is_red(n)) {
+ /* verify 4) */
+ assert(!n->left || c_rbnode_is_black(n->left));
+ assert(!n->right || c_rbnode_is_black(n->right));
+ } else {
+ /* verify 1) */
+ assert(c_rbnode_is_black(n));
+ }
+
+ /* verify 5) */
+ if (!n->left && !n->right)
+ assert(i_black == n_black);
+
+ /* get next node */
+ if (n->right) {
+ n = n->right;
+ if (c_rbnode_is_black(n))
+ ++i_black;
+
+ while (n->left) {
+ n = n->left;
+ if (c_rbnode_is_black(n))
+ ++i_black;
+ }
+ } else {
+ while ((p = c_rbnode_parent(n)) && n == p->right) {
+ n = p;
+ if (c_rbnode_is_black(p->right))
+ --i_black;
+ }
+
+ n = p;
+ if (p && c_rbnode_is_black(p->left))
+ --i_black;
+ }
+ }
+
+ return count;
+}
+
+static void insert(CRBTree *t, CRBNode *n) {
+ CRBNode **i, *p;
+
+ assert(t);
+ assert(n);
+ assert(!c_rbnode_is_linked(n));
+
+ i = &t->root;
+ p = NULL;
+ while (*i) {
+ p = *i;
+ if (n < *i) {
+ i = &(*i)->left;
+ } else {
+ assert(n > *i);
+ i = &(*i)->right;
+ }
+ }
+
+ c_rbtree_add(t, p, i, n);
+}
+
+static void shuffle(CRBNode **nodes, size_t n_memb) {
+ unsigned int i, j;
+ CRBNode *t;
+
+ for (i = 0; i < n_memb; ++i) {
+ j = rand() % n_memb;
+ t = nodes[j];
+ nodes[j] = nodes[i];
+ nodes[i] = t;
+ }
+}
+
+static void test_shuffle(void) {
+ CRBNode *nodes[2048];
+ CRBTree t = {};
+ unsigned int i, j;
+ size_t n;
+
+ /* allocate and initialize all nodes */
+ for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
+ nodes[i] = malloc(sizeof(*nodes[i]));
+ assert(nodes[i]);
+ c_rbnode_init(nodes[i]);
+ }
+
+ /* shuffle nodes and validate *empty* tree */
+ shuffle(nodes, sizeof(nodes) / sizeof(*nodes));
+ n = validate(&t);
+ assert(n == 0);
+
+ /* add all nodes and validate after each insertion */
+ for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
+ insert(&t, nodes[i]);
+ n = validate(&t);
+ assert(n == i + 1);
+ }
+
+ /* shuffle nodes again */
+ shuffle(nodes, sizeof(nodes) / sizeof(*nodes));
+
+ /* remove all nodes (in different order) and validate on each round */
+ for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
+ c_rbtree_remove(&t, nodes[i]);
+ n = validate(&t);
+ assert(n == sizeof(nodes) / sizeof(*nodes) - i - 1);
+ c_rbnode_init(nodes[i]);
+ }
+
+ /* shuffle nodes and validate *empty* tree again */
+ shuffle(nodes, sizeof(nodes) / sizeof(*nodes));
+ n = validate(&t);
+ assert(n == 0);
+
+ /* add all nodes again */
+ for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
+ insert(&t, nodes[i]);
+ n = validate(&t);
+ assert(n == i + 1);
+ }
+
+ /* 4 times, remove half of the nodes and add them again */
+ for (j = 0; j < 4; ++j) {
+ /* shuffle nodes again */
+ shuffle(nodes, sizeof(nodes) / sizeof(*nodes));
+
+ /* remove half of the nodes */
+ for (i = 0; i < sizeof(nodes) / sizeof(*nodes) / 2; ++i) {
+ c_rbtree_remove(&t, nodes[i]);
+ n = validate(&t);
+ assert(n == sizeof(nodes) / sizeof(*nodes) - i - 1);
+ c_rbnode_init(nodes[i]);
+ }
+
+ /* shuffle the removed half */
+ shuffle(nodes, sizeof(nodes) / sizeof(*nodes) / 2);
+
+ /* add the removed half again */
+ for (i = 0; i < sizeof(nodes) / sizeof(*nodes) / 2; ++i) {
+ insert(&t, nodes[i]);
+ n = validate(&t);
+ assert(n == sizeof(nodes) / sizeof(*nodes) / 2 + i + 1);
+ }
+ }
+
+ /* shuffle nodes again */
+ shuffle(nodes, sizeof(nodes) / sizeof(*nodes));
+
+ /* remove all */
+ for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
+ c_rbtree_remove(&t, nodes[i]);
+ n = validate(&t);
+ assert(n == sizeof(nodes) / sizeof(*nodes) - i - 1);
+ c_rbnode_init(nodes[i]);
+ }
+
+ /* free nodes again */
+ for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i)
+ free(nodes[i]);
+}
+
+int main(int argc, char **argv) {
+ unsigned int i;
+
+ /* we want stable tests, so use fixed seed */
+ srand(0xdeadbeef);
+
+ /*
+ * The tests are pseudo random; run them multiple times, each run will
+ * have different orders and thus different results.
+ */
+ for (i = 0; i < 4; ++i)
+ test_shuffle();
+
+ return 0;
+}
projects / crbtree.git / commitdiff