string/test-strncmp.c

   1 /* Test strncmp and wcsncmp functions.
   2    Copyright (C) 1999-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #define TEST_MAIN
  21 #ifdef WIDE
  22 # define TEST_NAME "wcsncmp"
  23 #else
  24 # define TEST_NAME "strncmp"
  25 #endif
  26 #include "test-string.h"
  27
  28 #ifdef WIDE
  29 # include <wchar.h>
  30
  31 # define L(str) L##str
  32 # define STRNCMP wcsncmp
  33 # define STRCPY wcscpy
  34 # define STRDUP wcsdup
  35 # define MEMCPY wmemcpy
  36 # define SIMPLE_STRNCMP simple_wcsncmp
  37 # define STUPID_STRNCMP stupid_wcsncmp
  38 # define CHAR wchar_t
  39 # define UCHAR wchar_t
  40 # define CHARBYTES 4
  41 # define CHAR__MAX WCHAR_MAX
  42 # define CHAR__MIN WCHAR_MIN
  43
  44 /* Wcsncmp uses signed semantics for comparison, not unsigned.
  45    Avoid using substraction since possible overflow */
  46 int
  47 simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
  48 {
  49   wchar_t c1, c2;
  50
  51   while (n--)
  52     {
  53       c1 = *s1++;
  54       c2 = *s2++;
  55       if (c1 == L('\0') || c1 != c2)
  56         return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
  57     }
  58   return 0;
  59 }
  60
  61 int
  62 stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
  63 {
  64   wchar_t c1, c2;
  65   size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1;
  66
  67   n = ns1 < n ? ns1 : n;
  68   n = ns2 < n ? ns2 : n;
  69
  70   while (n--)
  71     {
  72       c1 = *s1++;
  73       c2 = *s2++;
  74       if (c1 != c2)
  75         return c1 > c2 ? 1 : -1;
  76     }
  77   return 0;
  78 }
  79
  80 #else
  81 # define L(str) str
  82 # define STRNCMP strncmp
  83 # define STRCPY strcpy
  84 # define STRDUP strdup
  85 # define MEMCPY memcpy
  86 # define SIMPLE_STRNCMP simple_strncmp
  87 # define STUPID_STRNCMP stupid_strncmp
  88 # define CHAR char
  89 # define UCHAR unsigned char
  90 # define CHARBYTES 1
  91 # define CHAR__MAX CHAR_MAX
  92 # define CHAR__MIN CHAR_MIN
  93
  94 /* Strncmp uses unsigned semantics for comparison. */
  95 int
  96 simple_strncmp (const char *s1, const char *s2, size_t n)
  97 {
  98   int ret = 0;
  99
 100   while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
 101          && *s1++);
 102   return ret;
 103 }
 104
 105 int
 106 stupid_strncmp (const char *s1, const char *s2, size_t n)
 107 {
 108   size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
 109   int ret = 0;
 110
 111   n = ns1 < n ? ns1 : n;
 112   n = ns2 < n ? ns2 : n;
 113   while (n-- && (ret = *(unsigned char *) s1++ - * (unsigned char *) s2++) == 0);
 114   return ret;
 115 }
 116
 117 #endif
 118
 119 typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
 120
 121 IMPL (STUPID_STRNCMP, 0)
 122 IMPL (SIMPLE_STRNCMP, 0)
 123 IMPL (STRNCMP, 1)
 124
 125
 126 static int
 127 check_result (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
 128              int exp_result)
 129 {
 130   int result = CALL (impl, s1, s2, n);
 131   if ((exp_result == 0 && result != 0)
 132       || (exp_result < 0 && result >= 0)
 133       || (exp_result > 0 && result <= 0))
 134     {
 135       error (0, 0, "Wrong result in function %s %d %d", impl->name,
 136              result, exp_result);
 137       ret = 1;
 138       return -1;
 139     }
 140
 141   return 0;
 142 }
 143
 144 static void
 145 do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
 146              int exp_result)
 147 {
 148   if (check_result (impl, s1, s2, n, exp_result) < 0)
 149     return;
 150 }
 151
 152 static void
 153 do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
 154          int exp_result)
 155 {
 156   size_t i, align_n;
 157   CHAR *s1, *s2;
 158
 159   if (n == 0)
 160     {
 161       s1 = (CHAR *) (buf1 + page_size);
 162       s2 = (CHAR *) (buf2 + page_size);
 163
 164       FOR_EACH_IMPL (impl, 0)
 165         do_one_test (impl, s1, s2, n, 0);
 166
 167       return;
 168     }
 169
 170   align1 &= 15;
 171   align2 &= 15;
 172   align_n = (page_size - n * CHARBYTES) & 15;
 173
 174   s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
 175   s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
 176
 177   if (align1 < align_n)
 178     s1 = (CHAR *) ((char *) s1 - (align_n - align1));
 179
 180   if (align2 < align_n)
 181     s2 = (CHAR *) ((char *) s2 - (align_n - align2));
 182
 183   for (i = 0; i < n; i++)
 184     s1[i] = s2[i] = 1 + 23 * i % max_char;
 185
 186   if (len < n)
 187     {
 188       s1[len] = 0;
 189       s2[len] = 0;
 190       if (exp_result < 0)
 191         s2[len] = 32;
 192       else if (exp_result > 0)
 193         s1[len] = 64;
 194     }
 195
 196   FOR_EACH_IMPL (impl, 0)
 197     do_one_test (impl, s1, s2, n, exp_result);
 198 }
 199
 200 static void
 201 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
 202          int exp_result)
 203 {
 204   size_t i;
 205   CHAR *s1, *s2;
 206
 207   if (n == 0)
 208     return;
 209
 210   align1 &= 63;
 211   if (align1 + (n + 1) * CHARBYTES >= page_size)
 212     return;
 213
 214   align2 &= 63;
 215   if (align2 + (n + 1) * CHARBYTES >= page_size)
 216     return;
 217
 218   s1 = (CHAR *) (buf1 + align1);
 219   s2 = (CHAR *) (buf2 + align2);
 220
 221   for (i = 0; i < n; i++)
 222     s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
 223
 224   s1[n] = 24 + exp_result;
 225   s2[n] = 23;
 226   s1[len] = 0;
 227   s2[len] = 0;
 228   if (exp_result < 0)
 229     s2[len] = 32;
 230   else if (exp_result > 0)
 231     s1[len] = 64;
 232   if (len >= n)
 233     s2[n - 1] -= exp_result;
 234
 235   FOR_EACH_IMPL (impl, 0)
 236     do_one_test (impl, s1, s2, n, exp_result);
 237 }
 238
 239 static void
 240 do_page_test (size_t offset1, size_t offset2, CHAR *s2)
 241 {
 242   CHAR *s1;
 243   int exp_result;
 244
 245   if (offset1 * CHARBYTES  >= page_size || offset2 * CHARBYTES >= page_size)
 246     return;
 247
 248   s1 = (CHAR *) buf1;
 249   s1 += offset1;
 250   s2 += offset2;
 251
 252   exp_result= *s1;
 253
 254   FOR_EACH_IMPL (impl, 0)
 255     {
 256       check_result (impl, s1, s2, page_size, -exp_result);
 257       check_result (impl, s2, s1, page_size, exp_result);
 258     }
 259 }
 260
 261 static void
 262 do_random_tests (void)
 263 {
 264   size_t i, j, n, align1, align2, pos, len1, len2, size;
 265   int result;
 266   long r;
 267   UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
 268   UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
 269
 270   for (n = 0; n < ITERATIONS; n++)
 271     {
 272       align1 = random () & 31;
 273       if (random () & 1)
 274         align2 = random () & 31;
 275       else
 276         align2 = align1 + (random () & 24);
 277       pos = random () & 511;
 278       size = random () & 511;
 279       j = align1 > align2 ? align1 : align2;
 280       if (pos + j >= 511)
 281         pos = 510 - j - (random () & 7);
 282       len1 = random () & 511;
 283       if (pos >= len1 && (random () & 1))
 284         len1 = pos + (random () & 7);
 285       if (len1 + j >= 512)
 286         len1 = 511 - j - (random () & 7);
 287       if (pos >= len1)
 288         len2 = len1;
 289       else
 290         len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
 291       j = (pos > len2 ? pos : len2) + align1 + 64;
 292       if (j > 512)
 293         j = 512;
 294       for (i = 0; i < j; ++i)
 295         {
 296           p1[i] = random () & 255;
 297           if (i < len1 + align1 && !p1[i])
 298             {
 299               p1[i] = random () & 255;
 300               if (!p1[i])
 301                 p1[i] = 1 + (random () & 127);
 302             }
 303         }
 304       for (i = 0; i < j; ++i)
 305         {
 306           p2[i] = random () & 255;
 307           if (i < len2 + align2 && !p2[i])
 308             {
 309               p2[i] = random () & 255;
 310               if (!p2[i])
 311                 p2[i] = 1 + (random () & 127);
 312             }
 313         }
 314
 315       result = 0;
 316       MEMCPY (p2 + align2, p1 + align1, pos);
 317       if (pos < len1)
 318         {
 319           if (p2[align2 + pos] == p1[align1 + pos])
 320             {
 321               p2[align2 + pos] = random () & 255;
 322               if (p2[align2 + pos] == p1[align1 + pos])
 323                 p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
 324             }
 325
 326           if (pos < size)
 327             {
 328               if (p1[align1 + pos] < p2[align2 + pos])
 329                 result = -1;
 330               else
 331                 result = 1;
 332             }
 333         }
 334       p1[len1 + align1] = 0;
 335       p2[len2 + align2] = 0;
 336
 337       FOR_EACH_IMPL (impl, 1)
 338         {
 339           r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2), size);
 340           /* Test whether on 64-bit architectures where ABI requires
 341              callee to promote has the promotion been done.  */
 342           asm ("" : "=g" (r) : "0" (r));
 343           if ((r == 0 && result)
 344               || (r < 0 && result >= 0)
 345               || (r > 0 && result <= 0))
 346             {
 347               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
 348                      n, impl->name, align1, align2, len1, len2, pos, size, r, result, p1, p2);
 349               ret = 1;
 350             }
 351         }
 352     }
 353 }
 354
 355 static void
 356 check1 (void)
 357 {
 358   CHAR *s1 = (CHAR *) (buf1 + 0xb2c);
 359   CHAR *s2 = (CHAR *) (buf1 + 0xfd8);
 360   size_t i, offset;
 361   int exp_result;
 362
 363   STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"));
 364   STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV"));
 365
 366   /* Check possible overflow bug for wcsncmp */
 367   s1[4] = CHAR__MAX;
 368   s2[4] = CHAR__MIN;
 369
 370   for (offset = 0; offset < 6; offset++)
 371     {
 372       for (i = 0; i < 80; i++)
 373         {
 374           exp_result = SIMPLE_STRNCMP (s1 + offset, s2 + offset, i);
 375           FOR_EACH_IMPL (impl, 0)
 376             check_result (impl, s1 + offset, s2 + offset, i, exp_result);
 377         }
 378     }
 379 }
 380
 381 static void
 382 check2 (void)
 383 {
 384   size_t i;
 385   CHAR *s1, *s2;
 386
 387   s1 = (CHAR *) buf1;
 388   for (i = 0; i < (page_size / CHARBYTES) - 1; i++)
 389     s1[i] = 23;
 390   s1[i] = 0;
 391
 392   s2 = STRDUP (s1);
 393
 394   for (i = 0; i < 64; ++i)
 395     do_page_test ((3988 / CHARBYTES) + i, (2636 / CHARBYTES), s2);
 396
 397   free (s2);
 398 }
 399
 400 int
 401 test_main (void)
 402 {
 403   size_t i;
 404
 405   test_init ();
 406
 407   check1 ();
 408   check2 ();
 409
 410   printf ("%23s", "");
 411   FOR_EACH_IMPL (impl, 0)
 412     printf ("\t%s", impl->name);
 413   putchar ('\n');
 414
 415   for (i =0; i < 16; ++i)
 416     {
 417       do_test (0, 0, 8, i, 127, 0);
 418       do_test (0, 0, 8, i, 127, -1);
 419       do_test (0, 0, 8, i, 127, 1);
 420       do_test (i, i, 8, i, 127, 0);
 421       do_test (i, i, 8, i, 127, 1);
 422       do_test (i, i, 8, i, 127, -1);
 423       do_test (i, 2 * i, 8, i, 127, 0);
 424       do_test (2 * i, i, 8, i, 127, 1);
 425       do_test (i, 3 * i, 8, i, 127, -1);
 426       do_test (0, 0, 8, i, 255, 0);
 427       do_test (0, 0, 8, i, 255, -1);
 428       do_test (0, 0, 8, i, 255, 1);
 429       do_test (i, i, 8, i, 255, 0);
 430       do_test (i, i, 8, i, 255, 1);
 431       do_test (i, i, 8, i, 255, -1);
 432       do_test (i, 2 * i, 8, i, 255, 0);
 433       do_test (2 * i, i, 8, i, 255, 1);
 434       do_test (i, 3 * i, 8, i, 255, -1);
 435     }
 436
 437   for (i = 1; i < 8; ++i)
 438     {
 439       do_test (0, 0, 8 << i, 16 << i, 127, 0);
 440       do_test (0, 0, 8 << i, 16 << i, 127, 1);
 441       do_test (0, 0, 8 << i, 16 << i, 127, -1);
 442       do_test (0, 0, 8 << i, 16 << i, 255, 0);
 443       do_test (0, 0, 8 << i, 16 << i, 255, 1);
 444       do_test (0, 0, 8 << i, 16 << i, 255, -1);
 445       do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
 446       do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
 447       do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
 448       do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
 449     }
 450
 451   do_test_limit (0, 0, 0, 0, 127, 0);
 452   do_test_limit (4, 0, 21, 20, 127, 0);
 453   do_test_limit (0, 4, 21, 20, 127, 0);
 454   do_test_limit (8, 0, 25, 24, 127, 0);
 455   do_test_limit (0, 8, 25, 24, 127, 0);
 456
 457   for (i = 0; i < 8; ++i)
 458     {
 459       do_test_limit (0, 0, 17 - i, 16 - i, 127, 0);
 460       do_test_limit (0, 0, 17 - i, 16 - i, 255, 0);
 461       do_test_limit (0, 0, 15 - i, 16 - i, 127, 0);
 462       do_test_limit (0, 0, 15 - i, 16 - i, 127, 1);
 463       do_test_limit (0, 0, 15 - i, 16 - i, 127, -1);
 464       do_test_limit (0, 0, 15 - i, 16 - i, 255, 0);
 465       do_test_limit (0, 0, 15 - i, 16 - i, 255, 1);
 466       do_test_limit (0, 0, 15 - i, 16 - i, 255, -1);
 467     }
 468
 469   do_random_tests ();
 470   return ret;
 471 }
 472
 473 #include "../test-skeleton.c"