string/test-strncmp.c

   1 /* Test strncmp and wcsncmp functions.
   2    Copyright (C) 1999-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #define TEST_LEN (getpagesize () * 3)
  20 #define MIN_PAGE_SIZE (TEST_LEN + 2 * getpagesize ())
  21
  22 #define TEST_MAIN
  23 #ifdef WIDE
  24 # define TEST_NAME "wcsncmp"
  25 #else
  26 # define TEST_NAME "strncmp"
  27 #endif
  28 #define TIMEOUT (5 * 60)
  29 #include "test-string.h"
  30
  31 #ifdef WIDE
  32 # include <wchar.h>
  33
  34 # define L(str) L##str
  35 # define STRNCMP wcsncmp
  36 # define STRCPY wcscpy
  37 # define STRDUP wcsdup
  38 # define MEMCPY wmemcpy
  39 # define SIMPLE_STRNCMP simple_wcsncmp
  40 # define CHAR wchar_t
  41 # define UCHAR wchar_t
  42 # define CHARBYTES 4
  43 # define CHAR__MAX WCHAR_MAX
  44 # define CHAR__MIN WCHAR_MIN
  45
  46 /* Wcsncmp uses signed semantics for comparison, not unsigned.
  47    Avoid using subtraction since possible overflow */
  48 int
  49 simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
  50 {
  51   wchar_t c1, c2;
  52
  53   while (n--)
  54     {
  55       c1 = *s1++;
  56       c2 = *s2++;
  57       if (c1 == L('\0') || c1 != c2)
  58         return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
  59     }
  60   return 0;
  61 }
  62
  63 #else
  64 # define L(str) str
  65 # define STRNCMP strncmp
  66 # define STRCPY strcpy
  67 # define STRDUP strdup
  68 # define MEMCPY memcpy
  69 # define SIMPLE_STRNCMP simple_strncmp
  70 # define CHAR char
  71 # define UCHAR unsigned char
  72 # define CHARBYTES 1
  73 # define CHAR__MAX CHAR_MAX
  74 # define CHAR__MIN CHAR_MIN
  75
  76 /* Strncmp uses unsigned semantics for comparison. */
  77 int
  78 simple_strncmp (const char *s1, const char *s2, size_t n)
  79 {
  80   int ret = 0;
  81
  82   while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
  83          && *s1++);
  84   return ret;
  85 }
  86
  87 #endif
  88
  89 typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
  90
  91 IMPL (STRNCMP, 1)
  92
  93 /* Also check the default implementation.  */
  94 #undef STRNCMP
  95 #undef libc_hidden_builtin_def
  96 #define libc_hidden_builtin_def(a)
  97 #undef attribute_hidden
  98 #define attribute_hidden
  99 #ifndef WIDE
 100 # define STRNCMP __strncmp_default
 101 # include "string/strncmp.c"
 102 # define STRNCMP_DEFAULT STRNCMP
 103 #else
 104 # define WCSNCMP __wcsncmp_default
 105 # include "wcsmbs/wcsncmp.c"
 106 # define STRNCMP_DEFAULT WCSNCMP
 107 #endif
 108 IMPL (STRNCMP_DEFAULT, 1)
 109
 110 static int
 111 check_result (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
 112              int exp_result)
 113 {
 114   int result = CALL (impl, s1, s2, n);
 115   if ((exp_result == 0 && result != 0)
 116       || (exp_result < 0 && result >= 0)
 117       || (exp_result > 0 && result <= 0))
 118     {
 119       error (0, 0, "Wrong result in function %s %d %d", impl->name,
 120              result, exp_result);
 121       ret = 1;
 122       return -1;
 123     }
 124
 125   return 0;
 126 }
 127
 128 static void
 129 do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
 130              int exp_result)
 131 {
 132   if (check_result (impl, s1, s2, n, exp_result) < 0)
 133     return;
 134 }
 135
 136 static void
 137 do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
 138          int exp_result)
 139 {
 140   size_t i, align_n;
 141   CHAR *s1, *s2;
 142
 143   align1 &= ~(CHARBYTES - 1);
 144   align2 &= ~(CHARBYTES - 1);
 145
 146   if (n == 0)
 147     {
 148       s1 = (CHAR *) (buf1 + page_size);
 149       s2 = (CHAR *) (buf2 + page_size);
 150
 151       FOR_EACH_IMPL (impl, 0)
 152         do_one_test (impl, s1, s2, n, 0);
 153
 154       return;
 155     }
 156
 157   align1 &= 15;
 158   align2 &= 15;
 159   align_n = (page_size - n * CHARBYTES) & 15;
 160
 161   s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
 162   s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
 163
 164   if (align1 < align_n)
 165     s1 = (CHAR *) ((char *) s1 - (align_n - align1));
 166
 167   if (align2 < align_n)
 168     s2 = (CHAR *) ((char *) s2 - (align_n - align2));
 169
 170   for (i = 0; i < n; i++)
 171     s1[i] = s2[i] = 1 + 23 * i % max_char;
 172
 173   if (len < n)
 174     {
 175       s1[len] = 0;
 176       s2[len] = 0;
 177       if (exp_result < 0)
 178         s2[len] = 32;
 179       else if (exp_result > 0)
 180         s1[len] = 64;
 181     }
 182
 183   FOR_EACH_IMPL (impl, 0)
 184     do_one_test (impl, s1, s2, n, exp_result);
 185 }
 186
 187 static void
 188 do_test_n (size_t align1, size_t align2, size_t len, size_t n, int n_in_bounds,
 189            int max_char, int exp_result)
 190 {
 191   size_t i, buf_bound;
 192   CHAR *s1, *s2, *s1_end, *s2_end;
 193
 194   align1 &= ~(CHARBYTES - 1);
 195   align2 &= ~(CHARBYTES - 1);
 196
 197   if (n == 0)
 198     return;
 199
 200   buf_bound = n_in_bounds ? n : len;
 201
 202   align1 &= getpagesize () - 1;
 203   if (align1 + (buf_bound + 2) * CHARBYTES >= page_size)
 204     return;
 205
 206   align2 &= getpagesize () - 1;
 207   if (align2 + (buf_bound + 2) * CHARBYTES >= page_size)
 208     return;
 209
 210   s1 = (CHAR *)(buf1 + align1);
 211   s2 = (CHAR *)(buf2 + align2);
 212
 213   if (n_in_bounds)
 214     {
 215       s1[n] = 24 + exp_result;
 216       s2[n] = 23;
 217     }
 218
 219   for (i = 0; i < buf_bound; i++)
 220     s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
 221
 222   s1[len] = 0;
 223   s2[len] = 0;
 224   if (exp_result < 0)
 225     s2[len] = 32;
 226   else if (exp_result > 0)
 227     s1[len] = 64;
 228   if (len >= n)
 229     s2[n - 1] -= exp_result;
 230
 231   /* Ensure that both s1 and s2 are valid null terminated strings. This is
 232    * required by the standard. */
 233   s1_end = (CHAR *)(buf1 + MIN_PAGE_SIZE - CHARBYTES);
 234   s2_end = (CHAR *)(buf2 + MIN_PAGE_SIZE - CHARBYTES);
 235   *s1_end = 0;
 236   *s2_end = 0;
 237
 238   FOR_EACH_IMPL (impl, 0)
 239     do_one_test (impl, s1, s2, n, exp_result);
 240 }
 241
 242 static void
 243 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
 244          int exp_result)
 245 {
 246   do_test_n (align1, align2, len, n, 1, max_char, exp_result);
 247 }
 248
 249 static void
 250 do_page_test (size_t offset1, size_t offset2, CHAR *s2)
 251 {
 252   CHAR *s1;
 253   int exp_result;
 254
 255   if (offset1 * CHARBYTES  >= page_size || offset2 * CHARBYTES >= page_size)
 256     return;
 257
 258   s1 = (CHAR *) buf1;
 259   s1 += offset1;
 260   s2 += offset2;
 261
 262   exp_result= *s1;
 263
 264   FOR_EACH_IMPL (impl, 0)
 265     {
 266       check_result (impl, s1, s2, page_size, -exp_result);
 267       check_result (impl, s2, s1, page_size, exp_result);
 268     }
 269 }
 270
 271 static void
 272 do_random_tests (void)
 273 {
 274   size_t i, j, n, align1, align2, pos, len1, len2, size;
 275   int result;
 276   long r;
 277   UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
 278   UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
 279
 280   for (n = 0; n < ITERATIONS; n++)
 281     {
 282       align1 = random () & 31;
 283       if (random () & 1)
 284         align2 = random () & 31;
 285       else
 286         align2 = align1 + (random () & 24);
 287       pos = random () & 511;
 288       size = random () & 511;
 289       j = align1 > align2 ? align1 : align2;
 290       if (pos + j >= 511)
 291         pos = 510 - j - (random () & 7);
 292       len1 = random () & 511;
 293       if (pos >= len1 && (random () & 1))
 294         len1 = pos + (random () & 7);
 295       if (len1 + j >= 512)
 296         len1 = 511 - j - (random () & 7);
 297       if (pos >= len1)
 298         len2 = len1;
 299       else
 300         len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
 301       j = (pos > len2 ? pos : len2) + align1 + 64;
 302       if (j > 512)
 303         j = 512;
 304       for (i = 0; i < j; ++i)
 305         {
 306           p1[i] = random () & 255;
 307           if (i < len1 + align1 && !p1[i])
 308             {
 309               p1[i] = random () & 255;
 310               if (!p1[i])
 311                 p1[i] = 1 + (random () & 127);
 312             }
 313         }
 314       for (i = 0; i < j; ++i)
 315         {
 316           p2[i] = random () & 255;
 317           if (i < len2 + align2 && !p2[i])
 318             {
 319               p2[i] = random () & 255;
 320               if (!p2[i])
 321                 p2[i] = 1 + (random () & 127);
 322             }
 323         }
 324
 325       result = 0;
 326       MEMCPY (p2 + align2, p1 + align1, pos);
 327       if (pos < len1)
 328         {
 329           if (p2[align2 + pos] == p1[align1 + pos])
 330             {
 331               p2[align2 + pos] = random () & 255;
 332               if (p2[align2 + pos] == p1[align1 + pos])
 333                 p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
 334             }
 335
 336           if (pos < size)
 337             {
 338               if (p1[align1 + pos] < p2[align2 + pos])
 339                 result = -1;
 340               else
 341                 result = 1;
 342             }
 343         }
 344       p1[len1 + align1] = 0;
 345       p2[len2 + align2] = 0;
 346
 347       FOR_EACH_IMPL (impl, 1)
 348         {
 349           r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2), size);
 350           /* Test whether on 64-bit architectures where ABI requires
 351              callee to promote has the promotion been done.  */
 352           asm ("" : "=g" (r) : "0" (r));
 353           if ((r == 0 && result)
 354               || (r < 0 && result >= 0)
 355               || (r > 0 && result <= 0))
 356             {
 357               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
 358                      n, impl->name, align1, align2, len1, len2, pos, size, r, result, p1, p2);
 359               ret = 1;
 360             }
 361         }
 362     }
 363 }
 364
 365 static void
 366 check1 (void)
 367 {
 368   CHAR *s1 = (CHAR *) (buf1 + 0xb2c);
 369   CHAR *s2 = (CHAR *) (buf1 + 0xfd8);
 370   size_t i, offset;
 371   int exp_result;
 372
 373   STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"));
 374   STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV"));
 375
 376   /* Check possible overflow bug for wcsncmp */
 377   s1[4] = CHAR__MAX;
 378   s2[4] = CHAR__MIN;
 379
 380   for (offset = 0; offset < 6; offset++)
 381     {
 382       for (i = 0; i < 80; i++)
 383         {
 384           exp_result = SIMPLE_STRNCMP (s1 + offset, s2 + offset, i);
 385           FOR_EACH_IMPL (impl, 0)
 386             check_result (impl, s1 + offset, s2 + offset, i, exp_result);
 387         }
 388     }
 389 }
 390
 391 static void
 392 check2 (void)
 393 {
 394   size_t i;
 395   CHAR *s1, *s2;
 396
 397   s1 = (CHAR *) buf1;
 398   for (i = 0; i < (page_size / CHARBYTES) - 1; i++)
 399     s1[i] = 23;
 400   s1[i] = 0;
 401
 402   s2 = STRDUP (s1);
 403
 404   for (i = 0; i < 64; ++i)
 405     do_page_test ((3988 / CHARBYTES) + i, (2636 / CHARBYTES), s2);
 406
 407   free (s2);
 408 }
 409
 410 static void
 411 check3 (void)
 412 {
 413   /* To trigger bug 25933, we need a size that is equal to the vector
 414      length times 4. In the case of AVX2 for Intel, we need 32 * 4.  We
 415      make this test generic and run it for all architectures as additional
 416      boundary testing for such related algorithms.  */
 417   size_t size = 32 * 4;
 418   CHAR *s1 = (CHAR *) (buf1 + (BUF1PAGES - 1) * page_size);
 419   CHAR *s2 = (CHAR *) (buf2 + (BUF1PAGES - 1) * page_size);
 420   int exp_result;
 421
 422   memset (s1, 'a', page_size);
 423   memset (s2, 'a', page_size);
 424   s1[(page_size / CHARBYTES) - 1] = (CHAR) 0;
 425
 426   /* Iterate over a size that is just below where we expect the bug to
 427      trigger up to the size we expect will trigger the bug e.g. [99-128].
 428      Likewise iterate the start of two strings between 30 and 31 bytes
 429      away from the boundary to simulate alignment changes.  */
 430   for (size_t s = 99; s <= size; s++)
 431     for (size_t s1a = 30; s1a < 32; s1a++)
 432       for (size_t s2a = 30; s2a < 32; s2a++)
 433         {
 434           CHAR *s1p = s1 + (page_size / CHARBYTES - s) - s1a;
 435           CHAR *s2p = s2 + (page_size / CHARBYTES - s) - s2a;
 436           exp_result = SIMPLE_STRNCMP (s1p, s2p, s);
 437           FOR_EACH_IMPL (impl, 0)
 438             check_result (impl, s1p, s2p, s, exp_result);
 439         }
 440 }
 441
 442 static void
 443 check4 (void)
 444 {
 445   /* To trigger bug 28895; We need 1) both s1 and s2 to be within 32 bytes of
 446      the end of the page. 2) For there to be no mismatch/null byte before the
 447      first page cross. 3) For length (`n`) to be large enough for one string to
 448      cross the page. And 4) for there to be either mismatch/null bytes before
 449      the start of the strings.  */
 450
 451   size_t size = 10;
 452   size_t addr_mask = (getpagesize () - 1) ^ (sizeof (CHAR) - 1);
 453   CHAR *s1 = (CHAR *)(buf1 + (addr_mask & 0xffa));
 454   CHAR *s2 = (CHAR *)(buf2 + (addr_mask & 0xfed));
 455   int exp_result;
 456
 457   STRCPY (s1, L ("tst-tlsmod%"));
 458   STRCPY (s2, L ("tst-tls-manydynamic73mod"));
 459   exp_result = SIMPLE_STRNCMP (s1, s2, size);
 460   FOR_EACH_IMPL (impl, 0)
 461   check_result (impl, s1, s2, size, exp_result);
 462 }
 463
 464 static void
 465 check5 (void)
 466 {
 467   const CHAR *s1 = L ("abc");
 468   CHAR *s2 = STRDUP (s1);
 469
 470   FOR_EACH_IMPL (impl, 0)
 471     check_result (impl, s1, s2, SIZE_MAX, 0);
 472
 473   free (s2);
 474 }
 475
 476 static void
 477 check_overflow (void)
 478 {
 479   size_t i, j, of_mask, of_idx;
 480   const size_t of_masks[]
 481       = { ULONG_MAX, LONG_MIN, ULONG_MAX - (ULONG_MAX >> 2),
 482           ((size_t)LONG_MAX) >> 1 };
 483   const size_t test_len = MIN(TEST_LEN, 3 * 4096);
 484   for (of_idx = 0; of_idx < sizeof (of_masks) / sizeof (of_masks[0]); ++of_idx)
 485     {
 486       of_mask = of_masks[of_idx];
 487       for (j = 0; j < 160; ++j)
 488         {
 489           for (i = 1; i <= 161; i += (32 / sizeof (CHAR)))
 490             {
 491               do_test_n (j, 0, i, of_mask, 0, 127, 0);
 492               do_test_n (j, 0, i, of_mask, 0, 127, 1);
 493               do_test_n (j, 0, i, of_mask, 0, 127, -1);
 494
 495               do_test_n (j, 0, i, of_mask - j / 2, 0, 127, 0);
 496               do_test_n (j, 0, i, of_mask - j * 2, 0, 127, 1);
 497               do_test_n (j, 0, i, of_mask - j, 0, 127, -1);
 498
 499               do_test_n (j / 2, j, i, of_mask, 0, 127, 0);
 500               do_test_n (j / 2, j, i, of_mask, 0, 127, 1);
 501               do_test_n (j / 2, j, i, of_mask, 0, 127, -1);
 502
 503               do_test_n (j / 2, j, i, of_mask - j, 0, 127, 0);
 504               do_test_n (j / 2, j, i, of_mask - j / 2, 0, 127, 1);
 505               do_test_n (j / 2, j, i, of_mask - j * 2, 0, 127, -1);
 506
 507               do_test_n (0, j, i, of_mask - j * 2, 0, 127, 0);
 508               do_test_n (0, j, i, of_mask - j, 0, 127, 1);
 509               do_test_n (0, j, i, of_mask - j / 2, 0, 127, -1);
 510
 511               do_test_n (getpagesize () - j - 1, 0, i, of_mask, 0, 127, 0);
 512               do_test_n (getpagesize () - j - 1, 0, i, of_mask, 0, 127, 1);
 513               do_test_n (getpagesize () - j - 1, 0, i, of_mask, 0, 127, -1);
 514
 515               do_test_n (getpagesize () - j - 1, 0, i, of_mask - j / 2, 0, 127,
 516                          0);
 517               do_test_n (getpagesize () - j - 1, 0, i, of_mask - j * 2, 0, 127,
 518                          1);
 519               do_test_n (getpagesize () - j - 1, 0, i, of_mask - j, 0, 127,
 520                          -1);
 521
 522               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
 523                          of_mask, 0, 127, 0);
 524               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
 525                          of_mask, 0, 127, 1);
 526               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
 527                          of_mask, 0, 127, -1);
 528
 529               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
 530                          of_mask - j, 0, 127, 0);
 531               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
 532                          of_mask - j / 2, 0, 127, 1);
 533               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1, i,
 534                          of_mask - j * 2, 0, 127, -1);
 535             }
 536
 537           for (i = 1; i < test_len; i += i)
 538             {
 539               do_test_n (j, 0, i - 1, of_mask, 0, 127, 0);
 540               do_test_n (j, 0, i - 1, of_mask, 0, 127, 1);
 541               do_test_n (j, 0, i - 1, of_mask, 0, 127, -1);
 542
 543               do_test_n (j, 0, i - 1, of_mask - j / 2, 0, 127, 0);
 544               do_test_n (j, 0, i - 1, of_mask - j * 2, 0, 127, 1);
 545               do_test_n (j, 0, i - 1, of_mask - j, 0, 127, -1);
 546
 547               do_test_n (j / 2, j, i - 1, of_mask, 0, 127, 0);
 548               do_test_n (j / 2, j, i - 1, of_mask, 0, 127, 1);
 549               do_test_n (j / 2, j, i - 1, of_mask, 0, 127, -1);
 550
 551               do_test_n (j / 2, j, i - 1, of_mask - j, 0, 127, 0);
 552               do_test_n (j / 2, j, i - 1, of_mask - j / 2, 0, 127, 1);
 553               do_test_n (j / 2, j, i - 1, of_mask - j * 2, 0, 127, -1);
 554
 555               do_test_n (0, j, i - 1, of_mask - j * 2, 0, 127, 0);
 556               do_test_n (0, j, i - 1, of_mask - j, 0, 127, 1);
 557               do_test_n (0, j, i - 1, of_mask - j / 2, 0, 127, -1);
 558
 559               do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask, 0, 127, 0);
 560               do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask, 0, 127, 1);
 561               do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask, 0, 127,
 562                          -1);
 563
 564               do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask - j / 2, 0,
 565                          127, 0);
 566               do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask - j * 2, 0,
 567                          127, 1);
 568               do_test_n (getpagesize () - j - 1, 0, i - 1, of_mask - j, 0, 127,
 569                          -1);
 570
 571               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
 572                          i - 1, of_mask, 0, 127, 0);
 573               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
 574                          i - 1, of_mask, 0, 127, 1);
 575               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
 576                          i - 1, of_mask, 0, 127, -1);
 577
 578               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
 579                          i - 1, of_mask - j, 0, 127, 0);
 580               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
 581                          i - 1, of_mask - j / 2, 0, 127, 1);
 582               do_test_n (getpagesize () - j - 1, getpagesize () - 2 * j - 1,
 583                          i - 1, of_mask - j * 2, 0, 127, -1);
 584             }
 585         }
 586     }
 587 }
 588
 589 int
 590 test_main (void)
 591 {
 592   size_t i, j, k;
 593   const size_t test_len = MIN(TEST_LEN, 3 * 4096);
 594   test_init ();
 595
 596   check1 ();
 597   check2 ();
 598   check3 ();
 599   check4 ();
 600   check5 ();
 601
 602   printf ("%23s", "");
 603   FOR_EACH_IMPL (impl, 0)
 604     printf ("\t%s", impl->name);
 605   putchar ('\n');
 606
 607   for (i =0; i < 16; ++i)
 608     {
 609       do_test (0, 0, 8, i, 127, 0);
 610       do_test (0, 0, 8, i, 127, -1);
 611       do_test (0, 0, 8, i, 127, 1);
 612       do_test (i, i, 8, i, 127, 0);
 613       do_test (i, i, 8, i, 127, 1);
 614       do_test (i, i, 8, i, 127, -1);
 615       do_test (i, 2 * i, 8, i, 127, 0);
 616       do_test (2 * i, i, 8, i, 127, 1);
 617       do_test (i, 3 * i, 8, i, 127, -1);
 618       do_test (0, 0, 8, i, 255, 0);
 619       do_test (0, 0, 8, i, 255, -1);
 620       do_test (0, 0, 8, i, 255, 1);
 621       do_test (i, i, 8, i, 255, 0);
 622       do_test (i, i, 8, i, 255, 1);
 623       do_test (i, i, 8, i, 255, -1);
 624       do_test (i, 2 * i, 8, i, 255, 0);
 625       do_test (2 * i, i, 8, i, 255, 1);
 626       do_test (i, 3 * i, 8, i, 255, -1);
 627     }
 628
 629   for (i = 1; i < 8; ++i)
 630     {
 631       do_test (0, 0, 8 << i, 16 << i, 127, 0);
 632       do_test (0, 0, 8 << i, 16 << i, 127, 1);
 633       do_test (0, 0, 8 << i, 16 << i, 127, -1);
 634       do_test (0, 0, 8 << i, 16 << i, 255, 0);
 635       do_test (0, 0, 8 << i, 16 << i, 255, 1);
 636       do_test (0, 0, 8 << i, 16 << i, 255, -1);
 637       do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
 638       do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
 639       do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
 640       do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
 641     }
 642
 643   do_test_limit (0, 0, 0, 0, 127, 0);
 644   do_test_limit (4, 0, 21, 20, 127, 0);
 645   do_test_limit (0, 4, 21, 20, 127, 0);
 646   do_test_limit (8, 0, 25, 24, 127, 0);
 647   do_test_limit (0, 8, 25, 24, 127, 0);
 648
 649   for (i = 0; i < 8; ++i)
 650     {
 651       do_test_limit (0, 0, 17 - i, 16 - i, 127, 0);
 652       do_test_limit (0, 0, 17 - i, 16 - i, 255, 0);
 653       do_test_limit (0, 0, 15 - i, 16 - i, 127, 0);
 654       do_test_limit (0, 0, 15 - i, 16 - i, 127, 1);
 655       do_test_limit (0, 0, 15 - i, 16 - i, 127, -1);
 656       do_test_limit (0, 0, 15 - i, 16 - i, 255, 0);
 657       do_test_limit (0, 0, 15 - i, 16 - i, 255, 1);
 658       do_test_limit (0, 0, 15 - i, 16 - i, 255, -1);
 659     }
 660
 661   for (j = 0; j < 160; ++j)
 662     {
 663       for (i = 0; i < test_len;)
 664         {
 665           do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, 0);
 666           do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, 1);
 667           do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, -1);
 668
 669           do_test_n (getpagesize () - j - 1, 0, i, i, 0, 127, 0);
 670           do_test_n (getpagesize () - j - 1, 0, i, i - 1, 0, 127, 0);
 671
 672           do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, 0);
 673           do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, 1);
 674           do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, -1);
 675
 676           do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX - i, 0, 127, 0);
 677           do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX - i, 0, 127, 1);
 678           do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX - i, 0, 127, -1);
 679
 680           do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, 0);
 681           do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, 1);
 682           do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, -1);
 683
 684           do_test_n (getpagesize () - j - 1, j, i, i, 0, 127, 0);
 685           do_test_n (getpagesize () - j - 1, j, i, i - 1, 0, 127, 0);
 686
 687           do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, 0);
 688           do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, 1);
 689           do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, -1);
 690
 691           do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX - i, 0, 127, 0);
 692           do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX - i, 0, 127, 1);
 693           do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX - i, 0, 127, -1);
 694
 695           do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, 0);
 696           do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, 1);
 697           do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, -1);
 698
 699           do_test_n (0, getpagesize () - j - 1, i, i, 0, 127, 0);
 700           do_test_n (0, getpagesize () - j - 1, i, i - 1, 0, 127, 0);
 701
 702           do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 0);
 703           do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 1);
 704           do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, -1);
 705
 706           do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, 0);
 707           do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, 1);
 708           do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, -1);
 709
 710           do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, 0);
 711           do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, 1);
 712           do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, -1);
 713
 714           do_test_n (j, getpagesize () - j - 1, i, i, 0, 127, 0);
 715           do_test_n (j, getpagesize () - j - 1, i, i - 1, 0, 127, 0);
 716
 717           do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 0);
 718           do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 1);
 719           do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, -1);
 720
 721           do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, 0);
 722           do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, 1);
 723           do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX - i, 0, 127, -1);
 724
 725           for (k = 2; k <= 128; k += k)
 726             {
 727               do_test (getpagesize () - k, getpagesize () - j - 1, i - 1, i,
 728                        127, 0);
 729               do_test (getpagesize () - k - 1, getpagesize () - j - 1, i - 1,
 730                        i, 127, 0);
 731               do_test (getpagesize () - k, getpagesize () - j - 1, i + 1, i,
 732                        127, 0);
 733               do_test (getpagesize () - k - 1, getpagesize () - j - 1, i + 1,
 734                        i, 127, 0);
 735               do_test (getpagesize () - k, getpagesize () - j - 1, i, i, 127,
 736                        0);
 737               do_test (getpagesize () - k - 1, getpagesize () - j - 1, i, i,
 738                        127, 0);
 739               do_test (getpagesize () - k, getpagesize () - j - 1, i + 1, i,
 740                        127, -1);
 741               do_test (getpagesize () - k - 1, getpagesize () - j - 1, i + 1,
 742                        i, 127, -1);
 743               do_test (getpagesize () - k, getpagesize () - j - 1, i + 1, i,
 744                        127, 1);
 745               do_test (getpagesize () - k - 1, getpagesize () - j - 1, i + 1,
 746                        i, 127, 1);
 747             }
 748
 749           if (i < 32)
 750             {
 751               i += 1;
 752             }
 753           else if (i < 161)
 754             {
 755               i += 7;
 756             }
 757           else if (i + 161 < test_len)
 758             {
 759               i += 31;
 760               i *= 17;
 761               i /= 16;
 762               if (i + 161 > test_len)
 763                 {
 764                   i = test_len - 160;
 765                 }
 766             }
 767           else if (i + 32 < test_len)
 768             {
 769               i += 7;
 770             }
 771           else
 772             {
 773               i += 1;
 774             }
 775         }
 776     }
 777
 778   check_overflow ();
 779   do_random_tests ();
 780   return ret;
 781 }
 782
 783 #include <support/test-driver.c>