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 (1, i, SIZE_MAX, BIG_CHAR);
 100
 101       do_test (0, i, SIZE_MAX - i, BIG_CHAR);
 102       do_test (0, i, i - buf_addr, BIG_CHAR);
 103       do_test (0, i, -buf_addr - i, BIG_CHAR);
 104       do_test (0, i, SIZE_MAX - buf_addr - i, BIG_CHAR);
 105       do_test (0, i, SIZE_MAX - buf_addr + i, BIG_CHAR);
 106
 107       len = 0;
 108       for (j = 8 * sizeof(size_t) - 1; j ; --j)
 109         {
 110           len |= one << j;
 111           do_test (0, i, len - i, BIG_CHAR);
 112           do_test (0, i, len + i, BIG_CHAR);
 113           do_test (0, i, len - buf_addr - i, BIG_CHAR);
 114           do_test (0, i, len - buf_addr + i, BIG_CHAR);
 115
 116           do_test (0, i, ~len - i, BIG_CHAR);
 117           do_test (0, i, ~len + i, BIG_CHAR);
 118           do_test (0, i, ~len - buf_addr - i, BIG_CHAR);
 119           do_test (0, i, ~len - buf_addr + i, BIG_CHAR);
 120
 121           do_test (0, i, -buf_addr, BIG_CHAR);
 122           do_test (0, i, j - buf_addr, BIG_CHAR);
 123           do_test (0, i, -buf_addr - j, BIG_CHAR);
 124         }
 125     }
 126 }
 127
 128 static void
 129 do_random_tests (void)
 130 {
 131   size_t i, j, n, align, len;
 132   CHAR *p = (CHAR *) (buf1 + page_size - 512 * sizeof (CHAR));
 133
 134   for (n = 0; n < ITERATIONS; n++)
 135     {
 136       align = random () & 15;
 137       len = random () & 511;
 138       if (len + align > 510)
 139         len = 511 - align - (random () & 7);
 140       j = len + align + 64;
 141       if (j > 512)
 142         j = 512;
 143
 144       for (i = 0; i < j; i++)
 145         {
 146           if (i == len + align)
 147             p[i] = 0;
 148           else
 149             {
 150               p[i] = random () & 255;
 151               if (i >= align && i < len + align && !p[i])
 152                 p[i] = (random () & 127) + 1;
 153             }
 154         }
 155
 156       FOR_EACH_IMPL (impl, 1)
 157         {
 158           if (len > 0
 159               && CALL (impl, (CHAR *) (p + align), len - 1) != len - 1)
 160             {
 161               error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",
 162                      n, impl->name, align,
 163                      CALL (impl, (CHAR *) (p + align), len - 1), len - 1, p);
 164               ret = 1;
 165             }
 166           if (CALL (impl, (CHAR *) (p + align), len) != len)
 167             {
 168               error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",
 169                      n, impl->name, align,
 170                      CALL (impl, (CHAR *) (p + align), len), len, p);
 171               ret = 1;
 172             }
 173           if (CALL (impl, (CHAR *) (p + align), len + 1) != len)
 174             {
 175               error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",
 176                      n, impl->name, align,
 177                      CALL (impl, (CHAR *) (p + align), len + 1), len, p);
 178               ret = 1;
 179             }
 180         }
 181     }
 182 }
 183
 184 /* Tests meant to unveil fail on implementation that does not access bytes
 185    around the page boundary accordingly.  */
 186 static void
 187 do_page_tests (void)
 188 {
 189   size_t i, exp_len, start_offset, offset;
 190   /* Calculate the null character offset.  */
 191   size_t last_offset = (page_size / sizeof (CHAR)) - 1;
 192
 193   CHAR *s = (CHAR *) buf2;
 194   MEMSET (s, 65, (last_offset - 1));
 195   s[last_offset] = 0;
 196
 197   /* Place short strings ending at page boundary.  */
 198   offset = last_offset;
 199   for (i = 0; i < 128; i++)
 200     {
 201       /* Decrease offset to stress several sizes and alignments.  */
 202       offset--;
 203       exp_len = last_offset - offset;
 204       FOR_EACH_IMPL (impl, 0)
 205         {
 206           /* Varies maxlen value to cover the cases where it is:
 207                - larger than length;
 208                - slightly greater than length;
 209                - equal to length;
 210                - slightly less than length.  */
 211           do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
 212           do_one_test (impl, (CHAR *) (s + offset), exp_len + 1, exp_len);
 213           do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
 214           if (exp_len > 0)
 215             do_one_test (impl, (CHAR *) (s + offset), exp_len - 1, exp_len - 1);
 216         }
 217     }
 218
 219   /* Place long strings ending at page boundary.  */
 220   start_offset = (last_offset + 1) / 2;
 221   for (i = 0; i < 64; ++i)
 222     {
 223       /* Increase offset to stress several alignments.  */
 224       offset = start_offset + i;
 225       if (offset >= (last_offset + 1))
 226         break;
 227       exp_len = last_offset - offset;
 228       FOR_EACH_IMPL (impl, 0)
 229         {
 230           /* Checks only for maxlen much larger than length because smaller
 231              values are already covered in do_random_tests function.  */
 232           do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
 233         }
 234     }
 235 }
 236
 237 /* Tests meant to unveil fail on implementations that access bytes
 238    beyond the maxium length.  */
 239
 240 static void
 241 do_page_2_tests (void)
 242 {
 243   size_t i, exp_len, offset;
 244   size_t last_offset = page_size / sizeof (CHAR);
 245
 246   CHAR *s = (CHAR *) buf2;
 247   MEMSET (s, 65, last_offset);
 248
 249   /* Place short strings ending at page boundary without the null
 250      byte.  */
 251   offset = last_offset;
 252   for (i = 0; i < 128; i++)
 253     {
 254       /* Decrease offset to stress several sizes and alignments.  */
 255       offset--;
 256       exp_len = last_offset - offset;
 257       FOR_EACH_IMPL (impl, 0)
 258         {
 259           /* If an implementation goes beyond EXP_LEN, it will trigger
 260              the segfault.  */
 261           do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
 262         }
 263     }
 264 }
 265
 266 int
 267 test_main (void)
 268 {
 269   size_t i, length, char_per_page;
 270
 271   test_init ();
 272
 273   printf ("%20s", "");
 274   FOR_EACH_IMPL (impl, 0)
 275     printf ("\t%s", impl->name);
 276   putchar ('\n');
 277
 278   for (i = 1; i < 8; ++i)
 279     {
 280       do_test (0, i, i - 1, MIDDLE_CHAR);
 281       do_test (0, i, i, MIDDLE_CHAR);
 282       do_test (0, i, i + 1, MIDDLE_CHAR);
 283     }
 284
 285   for (i = 1; i < 8; ++i)
 286     {
 287       do_test (i, i, i - 1, MIDDLE_CHAR);
 288       do_test (i, i, i, MIDDLE_CHAR);
 289       do_test (i, i, i + 1, MIDDLE_CHAR);
 290     }
 291
 292   for (i = 2; i <= 10; ++i)
 293     {
 294       do_test (0, 1 << i, 5000, MIDDLE_CHAR);
 295       do_test (1, 1 << i, 5000, MIDDLE_CHAR);
 296     }
 297
 298   for (i = 1; i < 8; ++i)
 299     do_test (0, i, 5000, BIG_CHAR);
 300
 301   for (i = 1; i < 8; ++i)
 302     do_test (i, i, 5000, BIG_CHAR);
 303
 304   for (i = 2; i <= 10; ++i)
 305     {
 306       do_test (0, 1 << i, 5000, BIG_CHAR);
 307       do_test (1, 1 << i, 5000, BIG_CHAR);
 308     }
 309
 310   char_per_page = getpagesize () / sizeof (CHAR);
 311
 312   for (i = 0; i <= 127; i++)
 313     for (length = i; length <= 512; length++)
 314       {
 315         do_test (i, length, 512, BIG_CHAR);
 316         do_test (char_per_page - i, length, 512, BIG_CHAR);
 317       }
 318
 319   do_random_tests ();
 320   do_page_tests ();
 321   do_page_2_tests ();
 322   do_overflow_tests ();
 323   return ret;
 324 }
 325
 326 #include <support/test-driver.c>