about summary refs log tree commit diff
path: root/misc/tst-tsearch.c
blob: 7d164f9a0aba2c64901b963a2eac59d087361ed8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
/* Test program for tsearch et al.
   Copyright (C) 1997-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef _GNU_SOURCE
# define _GNU_SOURCE	1
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <search.h>
#include <tst-stack-align.h>

#define SEED 0
#define BALANCED 1
#define PASSES 100

#if BALANCED
#include <math.h>
#define SIZE 1000
#else
#define SIZE 100
#endif

enum order
{
  ascending,
  descending,
  randomorder
};

enum action
{
  build,
  build_and_del,
  delete,
  find
};

/* Set to 1 if a test is flunked.  */
static int error = 0;

/* The keys we add to the tree.  */
static int x[SIZE];

/* Pointers into the key array, possibly permutated, to define an order
   for insertion/removal.  */
static int y[SIZE];

/* Flags set for each element visited during a tree walk.  */
static int z[SIZE];

/* Depths for all the elements, to check that the depth is constant for
   all three visits.  */
static int depths[SIZE];

/* Maximum depth during a tree walk.  */
static int max_depth;

static int stack_align_check[2];

/* Compare two keys.  */
static int
cmp_fn (const void *a, const void *b)
{
  if (!stack_align_check[0])
    stack_align_check[0] = TEST_STACK_ALIGN () ? -1 : 1;
  return *(const int *) a - *(const int *) b;
}

/* Permute an array of integers.  */
static void
memfry (int *string)
{
  int i;

  for (i = 0; i < SIZE; ++i)
    {
      int32_t j;
      int c;

      j = random () % SIZE;

      c = string[i];
      string[i] = string[j];
      string[j] = c;
    }
}

static void
walk_action (const void *nodep, const VISIT which, const int depth)
{
  int key = **(int **) nodep;

  if (!stack_align_check[1])
    stack_align_check[1] = TEST_STACK_ALIGN () ? -1 : 1;

  if (depth > max_depth)
    max_depth = depth;
  if (which == leaf || which == preorder)
    {
      ++z[key];
      depths[key] = depth;
    }
  else
    {
      if (depths[key] != depth)
	{
	  fputs ("Depth for one element is not constant during tree walk.\n",
		 stdout);
	}
    }
}

static void
walk_tree (void *root, int expected_count)
{
  int i;

  memset (z, 0, sizeof z);
  max_depth = 0;

  twalk (root, walk_action);
  for (i = 0; i < expected_count; ++i)
    if (z[i] != 1)
      {
	fputs ("Node was not visited.\n", stdout);
	error = 1;
      }

#if BALANCED
  if (max_depth > log (expected_count) * 2 + 2)
#else
  if (max_depth > expected_count)
#endif
    {
      fputs ("Depth too large during tree walk.\n", stdout);
      error = 1;
    }
}

/* Perform an operation on a tree.  */
static void
mangle_tree (enum order how, enum action what, void **root, int lag)
{
  int i;

  if (how == randomorder)
    {
      for (i = 0; i < SIZE; ++i)
	y[i] = i;
      memfry (y);
    }

  for (i = 0; i < SIZE + lag; ++i)
    {
      void *elem;
      int j, k;

      switch (how)
	{
	case randomorder:
	  if (i >= lag)
	    k = y[i - lag];
	  else
	    /* Ensure that the array index is within bounds.  */
	    k = y[(SIZE - i - 1 + lag) % SIZE];
	  j = y[i % SIZE];
	  break;

	case ascending:
	  k = i - lag;
	  j = i;
	  break;

	case descending:
	  k = SIZE - i - 1 + lag;
	  j = SIZE - i - 1;
	  break;

	default:
	  /* This never should happen, but gcc isn't smart enough to
	     recognize it.  */
	  abort ();
	}

      switch (what)
	{
	case build_and_del:
	case build:
	  if (i < SIZE)
	    {
	      if (tfind (x + j, (void *const *) root, cmp_fn) != NULL)
		{
		  fputs ("Found element which is not in tree yet.\n", stdout);
		  error = 1;
		}
	      elem = tsearch (x + j, root, cmp_fn);
	      if (elem == 0
		  || tfind (x + j, (void *const *) root, cmp_fn) == NULL)
		{
		  fputs ("Couldn't find element after it was added.\n",
			 stdout);
		  error = 1;
		}
	    }

	  if (what == build || i < lag)
	    break;

	  j = k;
	  /* fall through */

	case delete:
	  elem = tfind (x + j, (void *const *) root, cmp_fn);
	  if (elem == NULL || tdelete (x + j, root, cmp_fn) == NULL)
	    {
	      fputs ("Error deleting element.\n", stdout);
	      error = 1;
	    }
	  break;

	case find:
	  if (tfind (x + j, (void *const *) root, cmp_fn) == NULL)
	    {
	      fputs ("Couldn't find element after it was added.\n", stdout);
	      error = 1;
	    }
	  break;

	}
    }
}


static int
do_test (void)
{
  int total_error = 0;
  static char state[8] = { 1, 2, 3, 4, 5, 6, 7, 8 };
  void *root = NULL;
  int i, j;

  initstate (SEED, state, 8);

  for (i = 0; i < SIZE; ++i)
    x[i] = i;

  /* Do this loop several times to get different permutations for the
     random case.  */
  fputs ("Series I\n", stdout);
  for (i = 0; i < PASSES; ++i)
    {
      fprintf (stdout, "Pass %d... ", i + 1);
      fflush (stdout);
      error = 0;

      mangle_tree (ascending, build, &root, 0);
      mangle_tree (ascending, find, &root, 0);
      mangle_tree (descending, find, &root, 0);
      mangle_tree (randomorder, find, &root, 0);
      walk_tree (root, SIZE);
      mangle_tree (ascending, delete, &root, 0);

      mangle_tree (ascending, build, &root, 0);
      walk_tree (root, SIZE);
      mangle_tree (descending, delete, &root, 0);

      mangle_tree (ascending, build, &root, 0);
      walk_tree (root, SIZE);
      mangle_tree (randomorder, delete, &root, 0);

      mangle_tree (descending, build, &root, 0);
      mangle_tree (ascending, find, &root, 0);
      mangle_tree (descending, find, &root, 0);
      mangle_tree (randomorder, find, &root, 0);
      walk_tree (root, SIZE);
      mangle_tree (descending, delete, &root, 0);

      mangle_tree (descending, build, &root, 0);
      walk_tree (root, SIZE);
      mangle_tree (descending, delete, &root, 0);

      mangle_tree (descending, build, &root, 0);
      walk_tree (root, SIZE);
      mangle_tree (randomorder, delete, &root, 0);

      mangle_tree (randomorder, build, &root, 0);
      mangle_tree (ascending, find, &root, 0);
      mangle_tree (descending, find, &root, 0);
      mangle_tree (randomorder, find, &root, 0);
      walk_tree (root, SIZE);
      mangle_tree (randomorder, delete, &root, 0);

      for (j = 1; j < SIZE; j *= 2)
	{
	  mangle_tree (randomorder, build_and_del, &root, j);
	}

      fputs (error ? " failed!\n" : " ok.\n", stdout);
      total_error |= error;
    }

  fputs ("Series II\n", stdout);
  for (i = 1; i < SIZE; i *= 2)
    {
      fprintf (stdout, "For size %d... ", i);
      fflush (stdout);
      error = 0;

      mangle_tree (ascending, build_and_del, &root, i);
      mangle_tree (descending, build_and_del, &root, i);
      mangle_tree (ascending, build_and_del, &root, i);
      mangle_tree (descending, build_and_del, &root, i);
      mangle_tree (ascending, build_and_del, &root, i);
      mangle_tree (descending, build_and_del, &root, i);
      mangle_tree (ascending, build_and_del, &root, i);
      mangle_tree (descending, build_and_del, &root, i);

      fputs (error ? " failed!\n" : " ok.\n", stdout);
      total_error |= error;
    }

  for (i = 0; i < 2; ++i)
    if (stack_align_check[i] == 0)
      {
        printf ("stack alignment check %d not run\n", i);
        total_error |= 1;
      }
    else if (stack_align_check[i] != 1)
      {
        printf ("stack insufficiently aligned in check %d\n", i);
        total_error |= 1;
      }

  return total_error;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"