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333 lines
7.3 KiB
333 lines
7.3 KiB
/* Test program for tsearch et al.
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Copyright (C) 1997, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE 1
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <search.h>
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#define SEED 0
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#define BALANCED 1
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#define PASSES 100
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#if BALANCED
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#include <math.h>
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#define SIZE 1000
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#else
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#define SIZE 100
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#endif
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enum order
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{
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ascending,
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descending,
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randomorder
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};
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enum action
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{
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build,
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build_and_del,
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delete,
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find
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};
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/* Set to 1 if a test is flunked. */
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static int error = 0;
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/* The keys we add to the tree. */
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static int x[SIZE];
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/* Pointers into the key array, possibly permutated, to define an order
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for insertion/removal. */
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static int y[SIZE];
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/* Flags set for each element visited during a tree walk. */
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static int z[SIZE];
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/* Depths for all the elements, to check that the depth is constant for
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all three visits. */
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static int depths[SIZE];
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/* Maximum depth during a tree walk. */
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static int max_depth;
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/* Compare two keys. */
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static int
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cmp_fn (const void *a, const void *b)
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{
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return *(const int *) a - *(const int *) b;
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}
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/* Permute an array of integers. */
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static void
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memfry (int *string)
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{
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int i;
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for (i = 0; i < SIZE; ++i)
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{
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int32_t j;
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int c;
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j = random () % SIZE;
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c = string[i];
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string[i] = string[j];
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string[j] = c;
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}
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}
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static void
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walk_action (const void *nodep, const VISIT which, const int depth)
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{
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int key = **(int **) nodep;
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if (depth > max_depth)
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max_depth = depth;
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if (which == leaf || which == preorder)
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{
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++z[key];
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depths[key] = depth;
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}
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else
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{
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if (depths[key] != depth)
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{
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fputs ("Depth for one element is not constant during tree walk.\n",
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stdout);
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}
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}
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}
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static void
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walk_tree (void *root, int expected_count)
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{
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int i;
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memset (z, 0, sizeof z);
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max_depth = 0;
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twalk (root, walk_action);
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for (i = 0; i < expected_count; ++i)
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if (z[i] != 1)
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{
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fputs ("Node was not visited.\n", stdout);
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error = 1;
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}
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#if BALANCED
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if (max_depth > log (expected_count) * 2 + 2)
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#else
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if (max_depth > expected_count)
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#endif
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{
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fputs ("Depth too large during tree walk.\n", stdout);
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error = 1;
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}
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}
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/* Perform an operation on a tree. */
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static void
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mangle_tree (enum order how, enum action what, void **root, int lag)
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{
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int i;
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if (how == randomorder)
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{
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for (i = 0; i < SIZE; ++i)
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y[i] = i;
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memfry (y);
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}
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for (i = 0; i < SIZE + lag; ++i)
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{
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void *elem;
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int j, k;
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switch (how)
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{
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case randomorder:
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if (i >= lag)
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k = y[i - lag];
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else
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/* Ensure that the array index is within bounds. */
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k = y[(SIZE - i - 1 + lag) % SIZE];
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j = y[i % SIZE];
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break;
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case ascending:
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k = i - lag;
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j = i;
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break;
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case descending:
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k = SIZE - i - 1 + lag;
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j = SIZE - i - 1;
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break;
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default:
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/* This never should happen, but gcc isn't smart enough to
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recognize it. */
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abort ();
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}
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switch (what)
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{
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case build_and_del:
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case build:
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if (i < SIZE)
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{
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if (tfind (x + j, (void *const *) root, cmp_fn) != NULL)
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{
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fputs ("Found element which is not in tree yet.\n", stdout);
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error = 1;
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}
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elem = tsearch (x + j, root, cmp_fn);
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if (elem == 0
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|| tfind (x + j, (void *const *) root, cmp_fn) == NULL)
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{
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fputs ("Couldn't find element after it was added.\n",
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stdout);
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error = 1;
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}
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}
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if (what == build || i < lag)
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break;
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j = k;
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/* fall through */
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case delete:
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elem = tfind (x + j, (void *const *) root, cmp_fn);
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if (elem == NULL || tdelete (x + j, root, cmp_fn) == NULL)
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{
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fputs ("Error deleting element.\n", stdout);
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error = 1;
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}
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break;
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case find:
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if (tfind (x + j, (void *const *) root, cmp_fn) == NULL)
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{
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fputs ("Couldn't find element after it was added.\n", stdout);
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error = 1;
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}
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break;
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}
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}
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}
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int
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main (int argc, char **argv)
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{
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int total_error = 0;
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static char state[8] = { 1, 2, 3, 4, 5, 6, 7, 8 };
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void *root = NULL;
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int i, j;
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initstate (SEED, state, 8);
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for (i = 0; i < SIZE; ++i)
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x[i] = i;
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/* Do this loop several times to get different permutations for the
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random case. */
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fputs ("Series I\n", stdout);
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for (i = 0; i < PASSES; ++i)
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{
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fprintf (stdout, "Pass %d... ", i + 1);
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fflush (stdout);
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error = 0;
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mangle_tree (ascending, build, &root, 0);
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mangle_tree (ascending, find, &root, 0);
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mangle_tree (descending, find, &root, 0);
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mangle_tree (randomorder, find, &root, 0);
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walk_tree (root, SIZE);
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mangle_tree (ascending, delete, &root, 0);
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mangle_tree (ascending, build, &root, 0);
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walk_tree (root, SIZE);
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mangle_tree (descending, delete, &root, 0);
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mangle_tree (ascending, build, &root, 0);
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walk_tree (root, SIZE);
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mangle_tree (randomorder, delete, &root, 0);
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mangle_tree (descending, build, &root, 0);
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mangle_tree (ascending, find, &root, 0);
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mangle_tree (descending, find, &root, 0);
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mangle_tree (randomorder, find, &root, 0);
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walk_tree (root, SIZE);
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mangle_tree (descending, delete, &root, 0);
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mangle_tree (descending, build, &root, 0);
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walk_tree (root, SIZE);
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mangle_tree (descending, delete, &root, 0);
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mangle_tree (descending, build, &root, 0);
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walk_tree (root, SIZE);
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mangle_tree (randomorder, delete, &root, 0);
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mangle_tree (randomorder, build, &root, 0);
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mangle_tree (ascending, find, &root, 0);
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mangle_tree (descending, find, &root, 0);
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mangle_tree (randomorder, find, &root, 0);
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walk_tree (root, SIZE);
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mangle_tree (randomorder, delete, &root, 0);
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for (j = 1; j < SIZE; j *= 2)
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{
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mangle_tree (randomorder, build_and_del, &root, j);
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}
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fputs (error ? " failed!\n" : " ok.\n", stdout);
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total_error |= error;
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}
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fputs ("Series II\n", stdout);
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for (i = 1; i < SIZE; i *= 2)
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{
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fprintf (stdout, "For size %d... ", i);
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fflush (stdout);
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error = 0;
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mangle_tree (ascending, build_and_del, &root, i);
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mangle_tree (descending, build_and_del, &root, i);
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mangle_tree (ascending, build_and_del, &root, i);
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mangle_tree (descending, build_and_del, &root, i);
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mangle_tree (ascending, build_and_del, &root, i);
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mangle_tree (descending, build_and_del, &root, i);
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mangle_tree (ascending, build_and_del, &root, i);
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mangle_tree (descending, build_and_del, &root, i);
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fputs (error ? " failed!\n" : " ok.\n", stdout);
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total_error |= error;
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}
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return total_error;
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}
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