string/test-memchr.c

   1 /* Test memchr functions.
   2    Copyright (C) 1999-2023 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 "memchr"
  22 #else
  23 # define TEST_NAME "wmemchr"
  24 #endif /* WIDE */
  25
  26 #include "test-string.h"
  27 #include <stdint.h>
  28
  29 #ifndef WIDE
  30 # define MEMCHR memchr
  31 # define CHAR char
  32 # define UCHAR unsigned char
  33 # define SIMPLE_MEMCHR simple_memchr
  34 # define BIG_CHAR CHAR_MAX
  35 # define SMALL_CHAR 127
  36 #else
  37 # include <wchar.h>
  38 # define MEMCHR wmemchr
  39 # define CHAR wchar_t
  40 # define UCHAR wchar_t
  41 # define SIMPLE_MEMCHR simple_wmemchr
  42 # define BIG_CHAR WCHAR_MAX
  43 # define SMALL_CHAR 1273
  44 #endif /* WIDE */
  45
  46 typedef CHAR *(*proto_t) (const CHAR *, int, size_t);
  47
  48 IMPL (MEMCHR, 1)
  49
  50 /* Naive implementation to verify results.  */
  51 CHAR *
  52 SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
  53 {
  54   while (n--)
  55     if (*s++ == (CHAR) c)
  56       return (CHAR *) s - 1;
  57   return NULL;
  58 }
  59
  60 static void
  61 do_one_test (impl_t *impl, const CHAR *s, int c, size_t n, CHAR *exp_res)
  62 {
  63   CHAR *res = CALL (impl, s, c, n);
  64   if (res != exp_res)
  65     {
  66       error (0, 0, "Wrong result in function %s (%p, %d, %zu) -> %p != %p",
  67              impl->name, s, c, n, res, exp_res);
  68       ret = 1;
  69       return;
  70     }
  71 }
  72
  73 static void
  74 do_test (size_t align, size_t pos, size_t len, size_t n, int seek_char)
  75 {
  76   size_t i;
  77   CHAR *result;
  78
  79   if ((align + len) * sizeof (CHAR) >= page_size)
  80     return;
  81
  82   CHAR *buf = (CHAR *) (buf1);
  83
  84   for (i = 0; i < len; ++i)
  85     {
  86       buf[align + i] = 1 + 23 * i % SMALL_CHAR;
  87       if (buf[align + i] == seek_char)
  88         buf[align + i] = seek_char + 1;
  89     }
  90   buf[align + len] = 0;
  91
  92   if (pos < MIN(n, len))
  93     {
  94       buf[align + pos] = seek_char;
  95       buf[align + len] = -seek_char;
  96       result = (CHAR *) (buf + align + pos);
  97     }
  98   else
  99     {
 100       result = NULL;
 101       buf[align + len] = seek_char;
 102     }
 103
 104   FOR_EACH_IMPL (impl, 0)
 105     do_one_test (impl, (CHAR *) (buf + align), seek_char, n, result);
 106 }
 107
 108 static void
 109 do_overflow_tests (void)
 110 {
 111   size_t i, j, len;
 112   const size_t one = 1;
 113   uintptr_t buf_addr = (uintptr_t) buf1;
 114
 115   for (i = 0; i < 750; ++i)
 116     {
 117         do_test (0, i, 751, SIZE_MAX - i, BIG_CHAR);
 118         do_test (0, i, 751, i - buf_addr, BIG_CHAR);
 119         do_test (0, i, 751, -buf_addr - i, BIG_CHAR);
 120         do_test (0, i, 751, SIZE_MAX - buf_addr - i, BIG_CHAR);
 121         do_test (0, i, 751, SIZE_MAX - buf_addr + i, BIG_CHAR);
 122
 123       len = 0;
 124       for (j = 8 * sizeof(size_t) - 1; j ; --j)
 125         {
 126           len |= one << j;
 127           do_test (0, i, 751, len - i, BIG_CHAR);
 128           do_test (0, i, 751, len + i, BIG_CHAR);
 129           do_test (0, i, 751, len - buf_addr - i, BIG_CHAR);
 130           do_test (0, i, 751, len - buf_addr + i, BIG_CHAR);
 131
 132           do_test (0, i, 751, ~len - i, BIG_CHAR);
 133           do_test (0, i, 751, ~len + i, BIG_CHAR);
 134           do_test (0, i, 751, ~len - buf_addr - i, BIG_CHAR);
 135           do_test (0, i, 751, ~len - buf_addr + i, BIG_CHAR);
 136         }
 137     }
 138 }
 139
 140 static void
 141 do_random_tests (void)
 142 {
 143   size_t i, j, n, align, pos, len;
 144   int seek_char;
 145   CHAR *result;
 146   UCHAR *p = (UCHAR *) (buf1 + page_size) - 512;
 147
 148   for (n = 0; n < ITERATIONS; n++)
 149     {
 150       align = random () & 15;
 151       pos = random () & 511;
 152       if (pos + align >= 512)
 153         pos = 511 - align - (random () & 7);
 154       len = random () & 511;
 155       if (pos >= len)
 156         len = pos + (random () & 7);
 157       if (len + align >= 512)
 158         len = 512 - align - (random () & 7);
 159       seek_char = random () & BIG_CHAR;
 160       j = len + align + 64;
 161       if (j > 512)
 162         j = 512;
 163
 164       for (i = 0; i < j; i++)
 165         {
 166           if (i == pos + align)
 167             p[i] = seek_char;
 168           else
 169             {
 170               p[i] = random () & BIG_CHAR;
 171               if (i < pos + align && p[i] == seek_char)
 172                 p[i] = seek_char + 13;
 173             }
 174         }
 175
 176       if (pos < len)
 177         {
 178           size_t r = random ();
 179           if ((r & 31) == 0)
 180             len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
 181           result = (CHAR *) (p + pos + align);
 182         }
 183       else
 184         result = NULL;
 185
 186       FOR_EACH_IMPL (impl, 1)
 187         if (CALL (impl, (CHAR *) (p + align), seek_char, len) != result)
 188           {
 189             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 190                    n, impl->name, align, seek_char, len, pos,
 191                    CALL (impl, (CHAR *) (p + align), seek_char, len),
 192                    result, p);
 193             ret = 1;
 194           }
 195     }
 196 }
 197
 198 int
 199 test_main (void)
 200 {
 201   size_t i, j;
 202
 203   test_init ();
 204
 205   printf ("%20s", "");
 206   FOR_EACH_IMPL (impl, 0)
 207     printf ("\t%s", impl->name);
 208   putchar ('\n');
 209
 210   for (i = 1; i < 8; ++i)
 211     {
 212       /* Test n == 0.  */
 213       do_test (i, i, 0, 0, 23);
 214       do_test (i, i, 0, 0, 0);
 215
 216       do_test (0, 16 << i, 2048, 2048, 23);
 217       do_test (i, 64, 256, 256, 23);
 218       do_test (0, 16 << i, 2048, 2048, 0);
 219       do_test (i, 64, 256, 256, 0);
 220
 221       /* Check for large input sizes and for these cases we need to
 222          make sure the byte is within the size range (that's why
 223          7 << i must be smaller than 2048).  */
 224       do_test (0, 7 << i, 2048, SIZE_MAX, 23);
 225       do_test (0, 2048 - i, 2048, SIZE_MAX, 23);
 226       do_test (i, 64, 256, SIZE_MAX, 23);
 227       do_test (0, 7 << i, 2048, SIZE_MAX, 0);
 228       do_test (0, 2048 - i, 2048, SIZE_MAX, 0);
 229       do_test (i, 64, 256, SIZE_MAX, 0);
 230     }
 231
 232   for (i = 1; i < 64; ++i)
 233     {
 234       for (j = 1; j < 64; j++)
 235         {
 236           do_test (0, 64 - j, 64, SIZE_MAX, 23);
 237           do_test (i, 64 - j, 64, SIZE_MAX, 23);
 238         }
 239     }
 240
 241   for (i = 1; i < 32; ++i)
 242     {
 243       do_test (0, i, i + 1, i + 1, 23);
 244       do_test (0, i, i + 1, i + 1, 0);
 245     }
 246
 247   /* BZ#21182 - wrong overflow calculation for i686 implementation
 248      with address near end of the page.  */
 249   for (i = 2; i < 16; ++i)
 250     {
 251       /* page_size is in fact getpagesize() * 2.  */
 252       do_test (page_size / 2 - i, i, i, 1, 0x9B);
 253       do_test (page_size / 2 - i, i - 1, i - 1, 1, 0x9B);
 254       do_test (page_size / 2 - (i * 4), i + 128, i + 128, i, 0x9B);
 255     }
 256
 257   do_random_tests ();
 258   do_overflow_tests ();
 259   return ret;
 260 }
 261
 262 #include <support/test-driver.c>