string/test-memrchr.c

   1 /* Test and measure memrchr functions.
   2    Copyright (C) 2013-2023 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 #define TEST_NAME "memrchr"
  21 #include "test-string.h"
  22
  23 typedef char *(*proto_t) (const char *, int, size_t);
  24
  25 IMPL (memrchr, 1)
  26
  27 /* Naive implementation to verify results.  */
  28 char *
  29 simple_memrchr (const char *s, int c, size_t n)
  30 {
  31   s = s + n;
  32   while (n--)
  33     if (*--s == (char) c)
  34       return (char *) s;
  35   return NULL;
  36 }
  37
  38 static void
  39 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
  40 {
  41   char *res = CALL (impl, s, c, n);
  42   if (res != exp_res)
  43     {
  44       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  45              res, exp_res);
  46       ret = 1;
  47       return;
  48     }
  49 }
  50
  51 static void
  52 do_test (size_t align, size_t pos, size_t len, int seek_char)
  53 {
  54   size_t i;
  55   char *result;
  56
  57   align &= 7;
  58   if (align + len >= page_size)
  59     return;
  60
  61   for (i = 0; i < len; ++i)
  62     {
  63       buf1[align + i] = 1 + 23 * i % 127;
  64       if (buf1[align + i] == seek_char)
  65         buf1[align + i] = seek_char + 1;
  66     }
  67   buf1[align + len] = 0;
  68
  69   if (pos < len)
  70     {
  71       buf1[align + pos] = seek_char;
  72       buf1[align + len] = -seek_char;
  73       result = (char *) (buf1 + align + pos);
  74     }
  75   else
  76     {
  77       result = NULL;
  78       buf1[align + len] = seek_char;
  79     }
  80
  81   FOR_EACH_IMPL (impl, 0)
  82     do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
  83 }
  84
  85 static void
  86 do_random_tests (void)
  87 {
  88   size_t i, j, n, align, pos, len;
  89   int seek_char;
  90   char *result;
  91   unsigned char *p = buf1 + page_size - 512;
  92
  93   for (n = 0; n < ITERATIONS; n++)
  94     {
  95       align = random () & 15;
  96       pos = random () & 511;
  97       if (pos + align >= 512)
  98         pos = 511 - align - (random () & 7);
  99       len = random () & 511;
 100       if (pos >= len)
 101         len = pos + (random () & 7);
 102       if (len + align >= 512)
 103         len = 512 - align - (random () & 7);
 104       seek_char = random () & 255;
 105       j = len + align + 64;
 106       if (j > 512)
 107         j = 512;
 108
 109       for (i = 0; i < j; i++)
 110         {
 111           if (i == pos + align)
 112             p[i] = seek_char;
 113           else
 114             {
 115               p[i] = random () & 255;
 116               if (p[i] == seek_char)
 117                 p[i] = seek_char + 13;
 118             }
 119         }
 120
 121       if (pos < len)
 122         result = (char *) (p + pos + align);
 123       else
 124         result = NULL;
 125
 126       FOR_EACH_IMPL (impl, 1)
 127         if (CALL (impl, (char *) (p + align), seek_char, len) != result)
 128           {
 129             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 130                    n, impl->name, align, seek_char, len, pos,
 131                    CALL (impl, (char *) (p + align), seek_char, len),
 132                    result, p);
 133             ret = 1;
 134           }
 135     }
 136 }
 137
 138 int
 139 test_main (void)
 140 {
 141   size_t i;
 142
 143   test_init ();
 144
 145   printf ("%20s", "");
 146   FOR_EACH_IMPL (impl, 0)
 147     printf ("\t%s", impl->name);
 148   putchar ('\n');
 149
 150   for (i = 1; i < 8; ++i)
 151     {
 152       /* Test len == 0.  */
 153       do_test (i, i, 0, 0);
 154       do_test (i, i, 0, 23);
 155
 156       do_test (0, 16 << i, 2048, 23);
 157       do_test (i, 64, 256, 23);
 158       do_test (0, 16 << i, 2048, 0);
 159       do_test (i, 64, 256, 0);
 160
 161       do_test (0, i, 256, 23);
 162       do_test (0, i, 256, 0);
 163       do_test (i, i, 256, 23);
 164       do_test (i, i, 256, 0);
 165
 166     }
 167   for (i = 1; i < 32; ++i)
 168     {
 169       do_test (0, i, i + 1, 23);
 170       do_test (0, i, i + 1, 0);
 171       do_test (i, i, i + 1, 23);
 172       do_test (i, i, i + 1, 0);
 173
 174       do_test (0, 1, i + 1, 23);
 175       do_test (0, 2, i + 1, 0);
 176       do_test (i, 1, i + 1, 23);
 177       do_test (i, 2, i + 1, 0);
 178     }
 179
 180   do_random_tests ();
 181   return ret;
 182 }
 183
 184 #include <support/test-driver.c>