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 BIG_CHAR CHAR_MAX
  34 # define SMALL_CHAR 127
  35 #else
  36 # include <wchar.h>
  37 # define MEMCHR wmemchr
  38 # define CHAR wchar_t
  39 # define UCHAR wchar_t
  40 # define BIG_CHAR WCHAR_MAX
  41 # define SMALL_CHAR 1273
  42 #endif /* WIDE */
  43
  44 typedef CHAR *(*proto_t) (const CHAR *, int, size_t);
  45
  46 IMPL (MEMCHR, 1)
  47
  48 /* Also check the generic implementation.  */
  49 #undef MEMCHR
  50 #undef weak_alias
  51 #define weak_alias(a, b)
  52 #undef libc_hidden_builtin_def
  53 #define libc_hidden_builtin_def(a)
  54 #undef libc_hidden_def
  55 #define libc_hidden_def(a)
  56 #undef libc_hidden_weak
  57 #define libc_hidden_weak(a)
  58 #ifndef WIDE
  59 # define MEMCHR __memchr_default
  60 # include "string/memchr.c"
  61 # define MEMCHR_DEFAULT MEMCHR
  62 #else
  63 # define WMEMCHR __wmemchr_default
  64 # include "wcsmbs/wmemchr.c"
  65 # define MEMCHR_DEFAULT WMEMCHR
  66 #endif
  67 IMPL (MEMCHR_DEFAULT, 1)
  68
  69 static void
  70 do_one_test (impl_t *impl, const CHAR *s, int c, size_t n, CHAR *exp_res)
  71 {
  72   CHAR *res = CALL (impl, s, c, n);
  73   if (res != exp_res)
  74     {
  75       error (0, 0, "Wrong result in function %s (%p, %d, %zu) -> %p != %p",
  76              impl->name, s, c, n, res, exp_res);
  77       ret = 1;
  78       return;
  79     }
  80 }
  81
  82 static void
  83 do_test (size_t align, size_t pos, size_t len, size_t n, int seek_char)
  84 {
  85   size_t i;
  86   CHAR *result;
  87
  88   if ((align + len) * sizeof (CHAR) >= page_size)
  89     return;
  90
  91   CHAR *buf = (CHAR *) (buf1);
  92
  93   for (i = 0; i < len; ++i)
  94     {
  95       buf[align + i] = 1 + 23 * i % SMALL_CHAR;
  96       if (buf[align + i] == seek_char)
  97         buf[align + i] = seek_char + 1;
  98     }
  99   buf[align + len] = 0;
 100
 101   if (pos < MIN(n, len))
 102     {
 103       buf[align + pos] = seek_char;
 104       buf[align + len] = -seek_char;
 105       result = (CHAR *) (buf + align + pos);
 106     }
 107   else
 108     {
 109       result = NULL;
 110       buf[align + len] = seek_char;
 111     }
 112
 113   FOR_EACH_IMPL (impl, 0)
 114     do_one_test (impl, (CHAR *) (buf + align), seek_char, n, result);
 115 }
 116
 117 static void
 118 do_overflow_tests (void)
 119 {
 120   size_t i, j, len;
 121   const size_t one = 1;
 122   uintptr_t buf_addr = (uintptr_t) buf1;
 123
 124   for (i = 0; i < 750; ++i)
 125     {
 126         do_test (0, i, 751, SIZE_MAX - i, BIG_CHAR);
 127         do_test (0, i, 751, i - buf_addr, BIG_CHAR);
 128         do_test (0, i, 751, -buf_addr - i, BIG_CHAR);
 129         do_test (0, i, 751, SIZE_MAX - buf_addr - i, BIG_CHAR);
 130         do_test (0, i, 751, SIZE_MAX - buf_addr + i, BIG_CHAR);
 131
 132       len = 0;
 133       for (j = 8 * sizeof(size_t) - 1; j ; --j)
 134         {
 135           len |= one << j;
 136           do_test (0, i, 751, len - i, BIG_CHAR);
 137           do_test (0, i, 751, len + i, BIG_CHAR);
 138           do_test (0, i, 751, len - buf_addr - i, BIG_CHAR);
 139           do_test (0, i, 751, len - buf_addr + i, BIG_CHAR);
 140
 141           do_test (0, i, 751, ~len - i, BIG_CHAR);
 142           do_test (0, i, 751, ~len + i, BIG_CHAR);
 143           do_test (0, i, 751, ~len - buf_addr - i, BIG_CHAR);
 144           do_test (0, i, 751, ~len - buf_addr + i, BIG_CHAR);
 145         }
 146     }
 147 }
 148
 149 static void
 150 do_random_tests (void)
 151 {
 152   size_t i, j, n, align, pos, len;
 153   int seek_char;
 154   CHAR *result;
 155   UCHAR *p = (UCHAR *) (buf1 + page_size) - 512;
 156
 157   for (n = 0; n < ITERATIONS; n++)
 158     {
 159       align = random () & 15;
 160       pos = random () & 511;
 161       if (pos + align >= 512)
 162         pos = 511 - align - (random () & 7);
 163       len = random () & 511;
 164       if (pos >= len)
 165         len = pos + (random () & 7);
 166       if (len + align >= 512)
 167         len = 512 - align - (random () & 7);
 168       seek_char = random () & BIG_CHAR;
 169       j = len + align + 64;
 170       if (j > 512)
 171         j = 512;
 172
 173       for (i = 0; i < j; i++)
 174         {
 175           if (i == pos + align)
 176             p[i] = seek_char;
 177           else
 178             {
 179               p[i] = random () & BIG_CHAR;
 180               if (i < pos + align && p[i] == seek_char)
 181                 p[i] = seek_char + 13;
 182             }
 183         }
 184
 185       if (pos < len)
 186         {
 187           size_t r = random ();
 188           if ((r & 31) == 0)
 189             len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
 190           result = (CHAR *) (p + pos + align);
 191         }
 192       else
 193         result = NULL;
 194
 195       FOR_EACH_IMPL (impl, 1)
 196         if (CALL (impl, (CHAR *) (p + align), seek_char, len) != result)
 197           {
 198             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 199                    n, impl->name, align, seek_char, len, pos,
 200                    CALL (impl, (CHAR *) (p + align), seek_char, len),
 201                    result, p);
 202             ret = 1;
 203           }
 204     }
 205 }
 206
 207 int
 208 test_main (void)
 209 {
 210   size_t i, j;
 211
 212   test_init ();
 213
 214   printf ("%20s", "");
 215   FOR_EACH_IMPL (impl, 0)
 216     printf ("\t%s", impl->name);
 217   putchar ('\n');
 218
 219   for (i = 1; i < 8; ++i)
 220     {
 221       /* Test n == 0.  */
 222       do_test (i, i, 0, 0, 23);
 223       do_test (i, i, 0, 0, 0);
 224
 225       do_test (0, 16 << i, 2048, 2048, 23);
 226       do_test (i, 64, 256, 256, 23);
 227       do_test (0, 16 << i, 2048, 2048, 0);
 228       do_test (i, 64, 256, 256, 0);
 229
 230       /* Check for large input sizes and for these cases we need to
 231          make sure the byte is within the size range (that's why
 232          7 << i must be smaller than 2048).  */
 233       do_test (0, 7 << i, 2048, SIZE_MAX, 23);
 234       do_test (0, 2048 - i, 2048, SIZE_MAX, 23);
 235       do_test (i, 64, 256, SIZE_MAX, 23);
 236       do_test (0, 7 << i, 2048, SIZE_MAX, 0);
 237       do_test (0, 2048 - i, 2048, SIZE_MAX, 0);
 238       do_test (i, 64, 256, SIZE_MAX, 0);
 239     }
 240
 241   for (i = 1; i < 64; ++i)
 242     {
 243       for (j = 1; j < 64; j++)
 244         {
 245           do_test (0, 64 - j, 64, SIZE_MAX, 23);
 246           do_test (i, 64 - j, 64, SIZE_MAX, 23);
 247         }
 248     }
 249
 250   for (i = 1; i < 32; ++i)
 251     {
 252       do_test (0, i, i + 1, i + 1, 23);
 253       do_test (0, i, i + 1, i + 1, 0);
 254     }
 255
 256   /* BZ#21182 - wrong overflow calculation for i686 implementation
 257      with address near end of the page.  */
 258   for (i = 2; i < 16; ++i)
 259     {
 260       /* page_size is in fact getpagesize() * 2.  */
 261       do_test (page_size / 2 - i, i, i, 1, 0x9B);
 262       do_test (page_size / 2 - i, i - 1, i - 1, 1, 0x9B);
 263       do_test (page_size / 2 - (i * 4), i + 128, i + 128, i, 0x9B);
 264     }
 265
 266   do_random_tests ();
 267   do_overflow_tests ();
 268   return ret;
 269 }
 270
 271 #include <support/test-driver.c>