string/test-strnlen.c

   1 /* Test strlen functions.
   2    Copyright (C) 1999-2017 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 #ifndef WIDE
  22 # define TEST_NAME "strnlen"
  23 #else
  24 # define TEST_NAME "wcsnlen"
  25 #endif /* !WIDE */
  26 #include "test-string.h"
  27
  28 #ifndef WIDE
  29 # define STRNLEN strnlen
  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 CHAR wchar_t
  38 # define BIG_CHAR WCHAR_MAX
  39 # define MIDDLE_CHAR 1121
  40 # define SIMPLE_STRNLEN simple_wcsnlen
  41 #endif /* !WIDE */
  42
  43 typedef size_t (*proto_t) (const CHAR *, size_t);
  44 size_t SIMPLE_STRNLEN (const CHAR *, size_t);
  45
  46 IMPL (SIMPLE_STRNLEN, 0)
  47 IMPL (STRNLEN, 1)
  48
  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_random_tests (void)
  92 {
  93   size_t i, j, n, align, len;
  94   CHAR *p = (CHAR *) (buf1 + page_size - 512 * sizeof (CHAR));
  95
  96   for (n = 0; n < ITERATIONS; n++)
  97     {
  98       align = random () & 15;
  99       len = random () & 511;
 100       if (len + align > 510)
 101         len = 511 - align - (random () & 7);
 102       j = len + align + 64;
 103       if (j > 512)
 104         j = 512;
 105
 106       for (i = 0; i < j; i++)
 107         {
 108           if (i == len + align)
 109             p[i] = 0;
 110           else
 111             {
 112               p[i] = random () & 255;
 113               if (i >= align && i < len + align && !p[i])
 114                 p[i] = (random () & 127) + 1;
 115             }
 116         }
 117
 118       FOR_EACH_IMPL (impl, 1)
 119         {
 120           if (len > 0
 121               && CALL (impl, (CHAR *) (p + align), len - 1) != len - 1)
 122             {
 123               error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",
 124                      n, impl->name, align,
 125                      CALL (impl, (CHAR *) (p + align), len - 1), len - 1, p);
 126               ret = 1;
 127             }
 128           if (CALL (impl, (CHAR *) (p + align), len) != len)
 129             {
 130               error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",
 131                      n, impl->name, align,
 132                      CALL (impl, (CHAR *) (p + align), len), len, p);
 133               ret = 1;
 134             }
 135           if (CALL (impl, (CHAR *) (p + align), len + 1) != len)
 136             {
 137               error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",
 138                      n, impl->name, align,
 139                      CALL (impl, (CHAR *) (p + align), len + 1), len, p);
 140               ret = 1;
 141             }
 142         }
 143     }
 144 }
 145
 146 /* Tests meant to unveil fail on implementation that does not access bytes
 147    around the page boundary accordingly.  */
 148 static void
 149 do_page_tests (void)
 150 {
 151   size_t i, exp_len, start_offset, offset;
 152   /* Calculate the null character offset.  */
 153   size_t last_offset = (page_size / sizeof (CHAR)) - 1;
 154
 155   CHAR *s = (CHAR *) buf2;
 156   memset (s, 65, (last_offset - 1));
 157   s[last_offset] = 0;
 158
 159   /* Place short strings ending at page boundary.  */
 160   offset = last_offset;
 161   for (i = 0; i < 128; i++)
 162     {
 163       /* Decrease offset to stress several sizes and alignments.  */
 164       offset--;
 165       exp_len = last_offset - offset;
 166       FOR_EACH_IMPL (impl, 0)
 167         {
 168           /* Varies maxlen value to cover the cases where it is:
 169                - larger than length;
 170                - slightly greater than length;
 171                - equal to length;
 172                - slightly less than length.  */
 173           do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
 174           do_one_test (impl, (CHAR *) (s + offset), exp_len + 1, exp_len);
 175           do_one_test (impl, (CHAR *) (s + offset), exp_len, exp_len);
 176           if (exp_len > 0)
 177             do_one_test (impl, (CHAR *) (s + offset), exp_len - 1, exp_len - 1);
 178         }
 179     }
 180
 181   /* Place long strings ending at page boundary.  */
 182   start_offset = (last_offset + 1) / 2;
 183   for (i = 0; i < 64; ++i)
 184     {
 185       /* Increase offset to stress several alignments.  */
 186       offset = start_offset + i;
 187       if (offset >= (last_offset + 1))
 188         break;
 189       exp_len = last_offset - offset;
 190       FOR_EACH_IMPL (impl, 0)
 191         {
 192           /* Checks only for maxlen much larger than length because smaller
 193              values are already covered in do_random_tests function.  */
 194           do_one_test (impl, (CHAR *) (s + offset), page_size, exp_len);
 195         }
 196     }
 197 }
 198
 199 int
 200 test_main (void)
 201 {
 202   size_t i;
 203
 204   test_init ();
 205
 206   printf ("%20s", "");
 207   FOR_EACH_IMPL (impl, 0)
 208     printf ("\t%s", impl->name);
 209   putchar ('\n');
 210
 211   for (i = 1; i < 8; ++i)
 212     {
 213       do_test (0, i, i - 1, MIDDLE_CHAR);
 214       do_test (0, i, i, MIDDLE_CHAR);
 215       do_test (0, i, i + 1, MIDDLE_CHAR);
 216     }
 217
 218   for (i = 1; i < 8; ++i)
 219     {
 220       do_test (i, i, i - 1, MIDDLE_CHAR);
 221       do_test (i, i, i, MIDDLE_CHAR);
 222       do_test (i, i, i + 1, MIDDLE_CHAR);
 223     }
 224
 225   for (i = 2; i <= 10; ++i)
 226     {
 227       do_test (0, 1 << i, 5000, MIDDLE_CHAR);
 228       do_test (1, 1 << i, 5000, MIDDLE_CHAR);
 229     }
 230
 231   for (i = 1; i < 8; ++i)
 232     do_test (0, i, 5000, BIG_CHAR);
 233
 234   for (i = 1; i < 8; ++i)
 235     do_test (i, i, 5000, BIG_CHAR);
 236
 237   for (i = 2; i <= 10; ++i)
 238     {
 239       do_test (0, 1 << i, 5000, BIG_CHAR);
 240       do_test (1, 1 << i, 5000, BIG_CHAR);
 241     }
 242
 243   do_random_tests ();
 244   do_page_tests ();
 245   return ret;
 246 }
 247
 248 #include <support/test-driver.c>