string/test-strnlen.c

   1 /* Test strlen functions.
   2    Copyright (C) 1999-2022 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 IMPL (STRNLEN, 1)
  47
  48 /* Naive implementation to verify results.  */
  49 size_t
  50 SIMPLE_STRNLEN (const CHAR *s, size_t maxlen)
  51 {
  52   size_t i;
  53
  54   for (i = 0; i < maxlen && s[i]; ++i);
  55   return i;
  56 }
  57
  58 static void
  59 do_one_test (impl_t *impl, const CHAR *s, size_t maxlen, size_t exp_len)
  60 {
  61   size_t len = CALL (impl, s, maxlen);
  62   if (len != exp_len)
  63     {
  64       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  65              len, exp_len);
  66       ret = 1;
  67       return;
  68     }
  69 }
  70
  71 static void
  72 do_test (size_t align, size_t len, size_t maxlen, int max_char)
  73 {
  74   size_t i;
  75
  76   align &= 63;
  77   if ((align + len) * sizeof (CHAR) >= page_size)
  78     return;
  79
  80   CHAR *buf = (CHAR *) (buf1);
  81
  82   for (i = 0; i < len; ++i)
  83     buf[align + i] = 1 + 11111 * i % max_char;
  84   buf[align + len] = 0;
  85
  86   FOR_EACH_IMPL (impl, 0)
  87     do_one_test (impl, (CHAR *) (buf + align), maxlen, MIN (len, maxlen));
  88 }
  89
  90 static void
  91 do_overflow_tests (void)
  92 {
  93   size_t i, j, len;
  94   const size_t one = 1;
  95   uintptr_t buf_addr = (uintptr_t) buf1;
  96
  97   for (i = 0; i < 750; ++i)
  98     {
  99       do_test (0, i, SIZE_MAX - i, BIG_CHAR);
 100       do_test (0, i, i - buf_addr, BIG_CHAR);
 101       do_test (0, i, -buf_addr - i, BIG_CHAR);
 102       do_test (0, i, SIZE_MAX - buf_addr - i, BIG_CHAR);
 103       do_test (0, i, SIZE_MAX - buf_addr + i, BIG_CHAR);
 104
 105       len = 0;
 106       for (j = 8 * sizeof(size_t) - 1; j ; --j)
 107         {
 108           len |= one << j;
 109           do_test (0, i, len - i, BIG_CHAR);
 110           do_test (0, i, len + i, BIG_CHAR);
 111           do_test (0, i, len - buf_addr - i, BIG_CHAR);
 112           do_test (0, i, len - buf_addr + i, BIG_CHAR);
 113
 114           do_test (0, i, ~len - i, BIG_CHAR);
 115           do_test (0, i, ~len + i, BIG_CHAR);
 116           do_test (0, i, ~len - buf_addr - i, BIG_CHAR);
 117           do_test (0, i, ~len - buf_addr + i, BIG_CHAR);
 118
 119           do_test (0, i, -buf_addr, BIG_CHAR);
 120           do_test (0, i, j - buf_addr, BIG_CHAR);
 121           do_test (0, i, -buf_addr - j, BIG_CHAR);
 122         }
 123     }
 124 }
 125
 126 static void
 127 do_random_tests (void)
 128 {
 129   size_t i, j, n, align, len;
 130   CHAR *p = (CHAR *) (buf1 + page_size - 512 * sizeof (CHAR));
 131
 132   for (n = 0; n < ITERATIONS; n++)
 133     {
 134       align = random () & 15;
 135       len = random () & 511;
 136       if (len + align > 510)
 137         len = 511 - align - (random () & 7);
 138       j = len + align + 64;
 139       if (j > 512)
 140         j = 512;
 141
 142       for (i = 0; i < j; i++)
 143         {
 144           if (i == len + align)
 145             p[i] = 0;
 146           else
 147             {
 148               p[i] = random () & 255;
 149               if (i >= align && i < len + align && !p[i])
 150                 p[i] = (random () & 127) + 1;
 151             }
 152         }
 153
 154       FOR_EACH_IMPL (impl, 1)
 155         {
 156           if (len > 0
 157               && CALL (impl, (CHAR *) (p + align), len - 1) != len - 1)
 158             {
 159               error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",
 160                      n, impl->name, align,
 161                      CALL (impl, (CHAR *) (p + align), len - 1), len - 1, p);
 162               ret = 1;
 163             }
 164           if (CALL (impl, (CHAR *) (p + align), len) != len)
 165             {
 166               error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",
 167                      n, impl->name, align,
 168                      CALL (impl, (CHAR *) (p + align), len), len, p);
 169               ret = 1;
 170             }
 171           if (CALL (impl, (CHAR *) (p + align), len + 1) != len)
 172             {
 173               error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",
 174                      n, impl->name, align,
 175                      CALL (impl, (CHAR *) (p + align), len + 1), len, p);
 176               ret = 1;
 177             }
 178         }
 179     }
 180 }
 181
 182 /* Tests meant to unveil fail on implementation that does not access bytes
 183    around the page boundary accordingly.  */
 184 static void
 185 do_page_tests (void)
 186 {
 187   size_t i, exp_len, start_offset, offset;
 188   /* Calculate the null character offset.  */
 189   size_t last_offset = (page_size / sizeof (CHAR)) - 1;
 190
 191   CHAR *s = (CHAR *) buf2;
 192   MEMSET (s, 65, (last_offset - 1));
 193   s[last_offset] = 0;
 194
 195   /* Place short strings ending at page boundary.  */
 196   offset = last_offset;
 197   for (i = 0; i < 128; i++)
 198     {
 199       /* Decrease offset to stress several sizes and alignments.  */
 200       offset--;
 201       exp_len = last_offset - offset;
 202       FOR_EACH_IMPL (impl, 0)
 203         {
 204           /* Varies maxlen value to cover the cases where it is:
 205                - larger than length;
 206                - slightly greater than length;
 207                - equal to length;
 208                - slightly less than length.  */
 209           do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
 210           do_one_test (impl, (CHAR *) (s + offset), exp_len + 1, exp_len);
 211           do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
 212           if (exp_len > 0)
 213             do_one_test (impl, (CHAR *) (s + offset), exp_len - 1, exp_len - 1);
 214         }
 215     }
 216
 217   /* Place long strings ending at page boundary.  */
 218   start_offset = (last_offset + 1) / 2;
 219   for (i = 0; i < 64; ++i)
 220     {
 221       /* Increase offset to stress several alignments.  */
 222       offset = start_offset + i;
 223       if (offset >= (last_offset + 1))
 224         break;
 225       exp_len = last_offset - offset;
 226       FOR_EACH_IMPL (impl, 0)
 227         {
 228           /* Checks only for maxlen much larger than length because smaller
 229              values are already covered in do_random_tests function.  */
 230           do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
 231         }
 232     }
 233 }
 234
 235 /* Tests meant to unveil fail on implementations that access bytes
 236    beyond the maxium length.  */
 237
 238 static void
 239 do_page_2_tests (void)
 240 {
 241   size_t i, exp_len, offset;
 242   size_t last_offset = page_size / sizeof (CHAR);
 243
 244   CHAR *s = (CHAR *) buf2;
 245   MEMSET (s, 65, last_offset);
 246
 247   /* Place short strings ending at page boundary without the null
 248      byte.  */
 249   offset = last_offset;
 250   for (i = 0; i < 128; i++)
 251     {
 252       /* Decrease offset to stress several sizes and alignments.  */
 253       offset--;
 254       exp_len = last_offset - offset;
 255       FOR_EACH_IMPL (impl, 0)
 256         {
 257           /* If an implementation goes beyond EXP_LEN, it will trigger
 258              the segfault.  */
 259           do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
 260         }
 261     }
 262 }
 263
 264 int
 265 test_main (void)
 266 {
 267   size_t i, length, char_per_page;
 268
 269   test_init ();
 270
 271   printf ("%20s", "");
 272   FOR_EACH_IMPL (impl, 0)
 273     printf ("\t%s", impl->name);
 274   putchar ('\n');
 275
 276   for (i = 1; i < 8; ++i)
 277     {
 278       do_test (0, i, i - 1, MIDDLE_CHAR);
 279       do_test (0, i, i, MIDDLE_CHAR);
 280       do_test (0, i, i + 1, MIDDLE_CHAR);
 281     }
 282
 283   for (i = 1; i < 8; ++i)
 284     {
 285       do_test (i, i, i - 1, MIDDLE_CHAR);
 286       do_test (i, i, i, MIDDLE_CHAR);
 287       do_test (i, i, i + 1, MIDDLE_CHAR);
 288     }
 289
 290   for (i = 2; i <= 10; ++i)
 291     {
 292       do_test (0, 1 << i, 5000, MIDDLE_CHAR);
 293       do_test (1, 1 << i, 5000, MIDDLE_CHAR);
 294     }
 295
 296   for (i = 1; i < 8; ++i)
 297     do_test (0, i, 5000, BIG_CHAR);
 298
 299   for (i = 1; i < 8; ++i)
 300     do_test (i, i, 5000, BIG_CHAR);
 301
 302   for (i = 2; i <= 10; ++i)
 303     {
 304       do_test (0, 1 << i, 5000, BIG_CHAR);
 305       do_test (1, 1 << i, 5000, BIG_CHAR);
 306     }
 307
 308   char_per_page = getpagesize () / sizeof (CHAR);
 309
 310   for (i = 0; i <= 127; i++)
 311     for (length = i; length <= 512; length++)
 312       {
 313         do_test (i, length, 512, BIG_CHAR);
 314         do_test (char_per_page - i, length, 512, BIG_CHAR);
 315       }
 316
 317   do_random_tests ();
 318   do_page_tests ();
 319   do_page_2_tests ();
 320   do_overflow_tests ();
 321   return ret;
 322 }
 323
 324 #include <support/test-driver.c>