string/test-strnlen.c

   1 /* Test strlen 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_MAIN
  20 #ifndef WIDE
  21 # define TEST_NAME "strnlen"
  22 #else
  23 # define TEST_NAME "wcsnlen"
  24 #endif /* !WIDE */
  25 #include "test-string.h"
  26
  27 #ifndef WIDE
  28 # define STRNLEN strnlen
  29 # define MEMSET memset
  30 # define CHAR char
  31 # define BIG_CHAR CHAR_MAX
  32 # define MIDDLE_CHAR 127
  33 # define SIMPLE_STRNLEN simple_strnlen
  34 #else
  35 # include <wchar.h>
  36 # define STRNLEN wcsnlen
  37 # define MEMSET wmemset
  38 # define CHAR wchar_t
  39 # define BIG_CHAR WCHAR_MAX
  40 # define MIDDLE_CHAR 1121
  41 # define SIMPLE_STRNLEN simple_wcsnlen
  42 #endif /* !WIDE */
  43
  44 typedef size_t (*proto_t) (const CHAR *, size_t);
  45
  46 /* Also check the default implementation.  */
  47 #undef STRNLEN
  48 #ifndef WIDE
  49 # define MEMCHR __memchr_default
  50 # define weak_alias(a, b)
  51 # define libc_hidden_def(a)
  52 # define libc_hidden_builtin_def(a)
  53 # include "string/memchr.c"
  54 # undef STRNLEN
  55 # define STRNLEN __strnlen_default
  56 # define memchr __memchr_default
  57 # include "string/strnlen.c"
  58 IMPL (__strnlen_default, 1)
  59 #else
  60 # define WMEMCHR __wmemchr_default
  61 # define weak_alias(a, b)
  62 # define libc_hidden_def(a)
  63 # define libc_hidden_weak(a)
  64 # include "wcsmbs/wmemchr.c"
  65 # define WCSNLEN __wcsnlen_default
  66 # define wmemchr __wmemchr_default
  67 # include "wcsmbs/wcsnlen.c"
  68 IMPL (__wcsnlen_default, 1)
  69 #endif
  70
  71 static void
  72 do_one_test (impl_t *impl, const CHAR *s, size_t maxlen, size_t exp_len)
  73 {
  74   size_t len = CALL (impl, s, maxlen);
  75   if (len != exp_len)
  76     {
  77       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  78              len, exp_len);
  79       ret = 1;
  80       return;
  81     }
  82 }
  83
  84 static void
  85 do_test (size_t align, size_t len, size_t maxlen, int max_char)
  86 {
  87   size_t i;
  88
  89   align &= (getpagesize () / sizeof (CHAR) - 1);
  90   if ((align + len) * sizeof (CHAR) >= page_size)
  91     return;
  92
  93   CHAR *buf = (CHAR *) (buf1);
  94
  95   for (i = 0; i < len; ++i)
  96     buf[align + i] = 1 + 11111 * i % max_char;
  97   buf[align + len] = 0;
  98
  99   FOR_EACH_IMPL (impl, 0)
 100     do_one_test (impl, (CHAR *) (buf + align), maxlen, MIN (len, maxlen));
 101 }
 102
 103 static void
 104 do_overflow_tests (void)
 105 {
 106   size_t i, j, al_idx, repeats, len;
 107   const size_t one = 1;
 108   uintptr_t buf_addr = (uintptr_t) buf1;
 109   const size_t alignments[] = { 0, 1, 7, 9, 31, 33, 63, 65, 95, 97, 127, 129 };
 110
 111   for (al_idx = 0; al_idx < sizeof (alignments) / sizeof (alignments[0]);
 112        al_idx++)
 113     {
 114       for (repeats = 0; repeats < 2; ++repeats)
 115         {
 116           size_t align = repeats ? (getpagesize () - alignments[al_idx])
 117                                  : alignments[al_idx];
 118           align /= sizeof (CHAR);
 119           for (i = 0; i < 750; ++i)
 120             {
 121               do_test (align, i, SIZE_MAX, BIG_CHAR);
 122
 123               do_test (align, i, SIZE_MAX - i, BIG_CHAR);
 124               do_test (align, i, i - buf_addr, BIG_CHAR);
 125               do_test (align, i, -buf_addr - i, BIG_CHAR);
 126               do_test (align, i, SIZE_MAX - buf_addr - i, BIG_CHAR);
 127               do_test (align, i, SIZE_MAX - buf_addr + i, BIG_CHAR);
 128
 129               len = 0;
 130               for (j = 8 * sizeof (size_t) - 1; j; --j)
 131                 {
 132                   len |= one << j;
 133                   do_test (align, i, len, BIG_CHAR);
 134                   do_test (align, i, len - i, BIG_CHAR);
 135                   do_test (align, i, len + i, BIG_CHAR);
 136                   do_test (align, i, len - buf_addr - i, BIG_CHAR);
 137                   do_test (align, i, len - buf_addr + i, BIG_CHAR);
 138
 139                   do_test (align, i, ~len - i, BIG_CHAR);
 140                   do_test (align, i, ~len + i, BIG_CHAR);
 141                   do_test (align, i, ~len - buf_addr - i, BIG_CHAR);
 142                   do_test (align, i, ~len - buf_addr + i, BIG_CHAR);
 143
 144                   do_test (align, i, -buf_addr, BIG_CHAR);
 145                   do_test (align, i, j - buf_addr, BIG_CHAR);
 146                   do_test (align, i, -buf_addr - j, BIG_CHAR);
 147                 }
 148             }
 149         }
 150     }
 151 }
 152
 153 static void
 154 do_random_tests (void)
 155 {
 156   size_t i, j, n, align, len;
 157   CHAR *p = (CHAR *) (buf1 + page_size - 512 * sizeof (CHAR));
 158
 159   for (n = 0; n < ITERATIONS; n++)
 160     {
 161       align = random () & 15;
 162       len = random () & 511;
 163       if (len + align > 510)
 164         len = 511 - align - (random () & 7);
 165       j = len + align + 64;
 166       if (j > 512)
 167         j = 512;
 168
 169       for (i = 0; i < j; i++)
 170         {
 171           if (i == len + align)
 172             p[i] = 0;
 173           else
 174             {
 175               p[i] = random () & 255;
 176               if (i >= align && i < len + align && !p[i])
 177                 p[i] = (random () & 127) + 1;
 178             }
 179         }
 180
 181       FOR_EACH_IMPL (impl, 1)
 182         {
 183           if (len > 0
 184               && CALL (impl, (CHAR *) (p + align), len - 1) != len - 1)
 185             {
 186               error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",
 187                      n, impl->name, align,
 188                      CALL (impl, (CHAR *) (p + align), len - 1), len - 1, p);
 189               ret = 1;
 190             }
 191           if (CALL (impl, (CHAR *) (p + align), len) != len)
 192             {
 193               error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",
 194                      n, impl->name, align,
 195                      CALL (impl, (CHAR *) (p + align), len), len, p);
 196               ret = 1;
 197             }
 198           if (CALL (impl, (CHAR *) (p + align), len + 1) != len)
 199             {
 200               error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",
 201                      n, impl->name, align,
 202                      CALL (impl, (CHAR *) (p + align), len + 1), len, p);
 203               ret = 1;
 204             }
 205         }
 206     }
 207 }
 208
 209 /* Tests meant to unveil fail on implementation that does not access bytes
 210    around the page boundary accordingly.  */
 211 static void
 212 do_page_tests (void)
 213 {
 214   size_t i, exp_len, start_offset, offset;
 215   /* Calculate the null character offset.  */
 216   size_t last_offset = (page_size / sizeof (CHAR)) - 1;
 217
 218   CHAR *s = (CHAR *) buf2;
 219   MEMSET (s, 65, (last_offset - 1));
 220   s[last_offset] = 0;
 221
 222   /* Place short strings ending at page boundary.  */
 223   offset = last_offset;
 224   for (i = 0; i < 128; i++)
 225     {
 226       /* Decrease offset to stress several sizes and alignments.  */
 227       offset--;
 228       exp_len = last_offset - offset;
 229       FOR_EACH_IMPL (impl, 0)
 230         {
 231           /* Varies maxlen value to cover the cases where it is:
 232                - larger than length;
 233                - slightly greater than length;
 234                - equal to length;
 235                - slightly less than length.  */
 236           do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
 237           do_one_test (impl, (CHAR *) (s + offset), exp_len + 1, exp_len);
 238           do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
 239           if (exp_len > 0)
 240             do_one_test (impl, (CHAR *) (s + offset), exp_len - 1, exp_len - 1);
 241         }
 242     }
 243
 244   /* Place long strings ending at page boundary.  */
 245   start_offset = (last_offset + 1) / 2;
 246   for (i = 0; i < 64; ++i)
 247     {
 248       /* Increase offset to stress several alignments.  */
 249       offset = start_offset + i;
 250       if (offset >= (last_offset + 1))
 251         break;
 252       exp_len = last_offset - offset;
 253       FOR_EACH_IMPL (impl, 0)
 254         {
 255           /* Checks only for maxlen much larger than length because smaller
 256              values are already covered in do_random_tests function.  */
 257           do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
 258         }
 259     }
 260 }
 261
 262 /* Tests meant to unveil fail on implementations that access bytes
 263    beyond the maximum length.  */
 264
 265 static void
 266 do_page_2_tests (void)
 267 {
 268   size_t i, exp_len, offset;
 269   size_t last_offset = page_size / sizeof (CHAR);
 270
 271   CHAR *s = (CHAR *) buf2;
 272   MEMSET (s, 65, last_offset);
 273
 274   /* Place short strings ending at page boundary without the null
 275      byte.  */
 276   offset = last_offset;
 277   for (i = 0; i < 128; i++)
 278     {
 279       /* Decrease offset to stress several sizes and alignments.  */
 280       offset--;
 281       exp_len = last_offset - offset;
 282       FOR_EACH_IMPL (impl, 0)
 283         {
 284           /* If an implementation goes beyond EXP_LEN, it will trigger
 285              the segfault.  */
 286           do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
 287         }
 288     }
 289 }
 290
 291 int
 292 test_main (void)
 293 {
 294   size_t i, length, char_per_page;
 295
 296   test_init ();
 297
 298   printf ("%20s", "");
 299   FOR_EACH_IMPL (impl, 0)
 300     printf ("\t%s", impl->name);
 301   putchar ('\n');
 302
 303   for (i = 1; i < 8; ++i)
 304     {
 305       do_test (0, i, i - 1, MIDDLE_CHAR);
 306       do_test (0, i, i, MIDDLE_CHAR);
 307       do_test (0, i, i + 1, MIDDLE_CHAR);
 308     }
 309
 310   for (i = 1; i < 8; ++i)
 311     {
 312       do_test (i, i, i - 1, MIDDLE_CHAR);
 313       do_test (i, i, i, MIDDLE_CHAR);
 314       do_test (i, i, i + 1, MIDDLE_CHAR);
 315     }
 316
 317   for (i = 2; i <= 10; ++i)
 318     {
 319       do_test (0, 1 << i, 5000, MIDDLE_CHAR);
 320       do_test (1, 1 << i, 5000, MIDDLE_CHAR);
 321     }
 322
 323   for (i = 1; i < 8; ++i)
 324     do_test (0, i, 5000, BIG_CHAR);
 325
 326   for (i = 1; i < 8; ++i)
 327     do_test (i, i, 5000, BIG_CHAR);
 328
 329   for (i = 2; i <= 10; ++i)
 330     {
 331       do_test (0, 1 << i, 5000, BIG_CHAR);
 332       do_test (1, 1 << i, 5000, BIG_CHAR);
 333     }
 334
 335   char_per_page = getpagesize () / sizeof (CHAR);
 336
 337   for (i = 0; i <= 127; i++)
 338     for (length = i; length <= 512; length++)
 339       {
 340         do_test (i, length, 512, BIG_CHAR);
 341         do_test (char_per_page - i, length, 512, BIG_CHAR);
 342       }
 343
 344   do_random_tests ();
 345   do_page_tests ();
 346   do_page_2_tests ();
 347   do_overflow_tests ();
 348   return ret;
 349 }
 350
 351 #include <support/test-driver.c>