string/test-memchr.c

   1 /* Test memchr 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 "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 CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t);
  48
  49 IMPL (SIMPLE_MEMCHR, 0)
  50 IMPL (MEMCHR, 1)
  51
  52 CHAR *
  53 SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)
  54 {
  55   while (n--)
  56     if (*s++ == (CHAR) c)
  57       return (CHAR *) s - 1;
  58   return NULL;
  59 }
  60
  61 static void
  62 do_one_test (impl_t *impl, const CHAR *s, int c, size_t n, CHAR *exp_res)
  63 {
  64   CHAR *res = CALL (impl, s, c, n);
  65   if (res != exp_res)
  66     {
  67       error (0, 0, "Wrong result in function %s (%p, %d, %zu) -> %p != %p",
  68              impl->name, s, c, n, res, exp_res);
  69       ret = 1;
  70       return;
  71     }
  72 }
  73
  74 static void
  75 do_test (size_t align, size_t pos, size_t len, size_t n, int seek_char)
  76 {
  77   size_t i;
  78   CHAR *result;
  79
  80   if ((align + len) * sizeof (CHAR) >= page_size)
  81     return;
  82
  83   CHAR *buf = (CHAR *) (buf1);
  84
  85   for (i = 0; i < len; ++i)
  86     {
  87       buf[align + i] = 1 + 23 * i % SMALL_CHAR;
  88       if (buf[align + i] == seek_char)
  89         buf[align + i] = seek_char + 1;
  90     }
  91   buf[align + len] = 0;
  92
  93   if (pos < MIN(n, len))
  94     {
  95       buf[align + pos] = seek_char;
  96       buf[align + len] = -seek_char;
  97       result = (CHAR *) (buf + align + pos);
  98     }
  99   else
 100     {
 101       result = NULL;
 102       buf[align + len] = seek_char;
 103     }
 104
 105   FOR_EACH_IMPL (impl, 0)
 106     do_one_test (impl, (CHAR *) (buf + align), seek_char, n, result);
 107 }
 108
 109 static void
 110 do_overflow_tests (void)
 111 {
 112   size_t i, j, len;
 113   const size_t one = 1;
 114   uintptr_t buf_addr = (uintptr_t) buf1;
 115
 116   for (i = 0; i < 750; ++i)
 117     {
 118         do_test (0, i, 751, SIZE_MAX - i, BIG_CHAR);
 119         do_test (0, i, 751, i - buf_addr, BIG_CHAR);
 120         do_test (0, i, 751, -buf_addr - i, BIG_CHAR);
 121         do_test (0, i, 751, SIZE_MAX - buf_addr - i, BIG_CHAR);
 122         do_test (0, i, 751, SIZE_MAX - buf_addr + i, BIG_CHAR);
 123
 124       len = 0;
 125       for (j = 8 * sizeof(size_t) - 1; j ; --j)
 126         {
 127           len |= one << j;
 128           do_test (0, i, 751, len - i, BIG_CHAR);
 129           do_test (0, i, 751, len + i, BIG_CHAR);
 130           do_test (0, i, 751, len - buf_addr - i, BIG_CHAR);
 131           do_test (0, i, 751, len - buf_addr + i, BIG_CHAR);
 132
 133           do_test (0, i, 751, ~len - i, BIG_CHAR);
 134           do_test (0, i, 751, ~len + i, BIG_CHAR);
 135           do_test (0, i, 751, ~len - buf_addr - i, BIG_CHAR);
 136           do_test (0, i, 751, ~len - buf_addr + i, BIG_CHAR);
 137         }
 138     }
 139 }
 140
 141 static void
 142 do_random_tests (void)
 143 {
 144   size_t i, j, n, align, pos, len;
 145   int seek_char;
 146   CHAR *result;
 147   UCHAR *p = (UCHAR *) (buf1 + page_size) - 512;
 148
 149   for (n = 0; n < ITERATIONS; n++)
 150     {
 151       align = random () & 15;
 152       pos = random () & 511;
 153       if (pos + align >= 512)
 154         pos = 511 - align - (random () & 7);
 155       len = random () & 511;
 156       if (pos >= len)
 157         len = pos + (random () & 7);
 158       if (len + align >= 512)
 159         len = 512 - align - (random () & 7);
 160       seek_char = random () & BIG_CHAR;
 161       j = len + align + 64;
 162       if (j > 512)
 163         j = 512;
 164
 165       for (i = 0; i < j; i++)
 166         {
 167           if (i == pos + align)
 168             p[i] = seek_char;
 169           else
 170             {
 171               p[i] = random () & BIG_CHAR;
 172               if (i < pos + align && p[i] == seek_char)
 173                 p[i] = seek_char + 13;
 174             }
 175         }
 176
 177       if (pos < len)
 178         {
 179           size_t r = random ();
 180           if ((r & 31) == 0)
 181             len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
 182           result = (CHAR *) (p + pos + align);
 183         }
 184       else
 185         result = NULL;
 186
 187       FOR_EACH_IMPL (impl, 1)
 188         if (CALL (impl, (CHAR *) (p + align), seek_char, len) != result)
 189           {
 190             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 191                    n, impl->name, align, seek_char, len, pos,
 192                    CALL (impl, (CHAR *) (p + align), seek_char, len),
 193                    result, p);
 194             ret = 1;
 195           }
 196     }
 197 }
 198
 199 int
 200 test_main (void)
 201 {
 202   size_t i, j;
 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       /* Test n == 0.  */
 214       do_test (i, i, 0, 0, 23);
 215       do_test (i, i, 0, 0, 0);
 216
 217       do_test (0, 16 << i, 2048, 2048, 23);
 218       do_test (i, 64, 256, 256, 23);
 219       do_test (0, 16 << i, 2048, 2048, 0);
 220       do_test (i, 64, 256, 256, 0);
 221
 222       /* Check for large input sizes and for these cases we need to
 223          make sure the byte is within the size range (that's why
 224          7 << i must be smaller than 2048).  */
 225       do_test (0, 7 << i, 2048, SIZE_MAX, 23);
 226       do_test (0, 2048 - i, 2048, SIZE_MAX, 23);
 227       do_test (i, 64, 256, SIZE_MAX, 23);
 228       do_test (0, 7 << i, 2048, SIZE_MAX, 0);
 229       do_test (0, 2048 - i, 2048, SIZE_MAX, 0);
 230       do_test (i, 64, 256, SIZE_MAX, 0);
 231     }
 232
 233   for (i = 1; i < 64; ++i)
 234     {
 235       for (j = 1; j < 64; j++)
 236         {
 237           do_test (0, 64 - j, 64, SIZE_MAX, 23);
 238           do_test (i, 64 - j, 64, SIZE_MAX, 23);
 239         }
 240     }
 241
 242   for (i = 1; i < 32; ++i)
 243     {
 244       do_test (0, i, i + 1, i + 1, 23);
 245       do_test (0, i, i + 1, i + 1, 0);
 246     }
 247
 248   /* BZ#21182 - wrong overflow calculation for i686 implementation
 249      with address near end of the page.  */
 250   for (i = 2; i < 16; ++i)
 251     /* page_size is in fact getpagesize() * 2.  */
 252     do_test (page_size / 2 - i, i, i, 1, 0x9B);
 253
 254   do_random_tests ();
 255   do_overflow_tests ();
 256   return ret;
 257 }
 258
 259 #include <support/test-driver.c>