string/test-memrchr.c

   1 /* Test and measure memrchr functions.
   2    Copyright (C) 2013-2022 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 #define TEST_NAME "memrchr"
  21 #include "test-string.h"
  22
  23 typedef char *(*proto_t) (const char *, int, size_t);
  24 char *simple_memrchr (const char *, int, size_t);
  25
  26 IMPL (simple_memrchr, 0)
  27 IMPL (memrchr, 1)
  28
  29 char *
  30 simple_memrchr (const char *s, int c, size_t n)
  31 {
  32   s = s + n;
  33   while (n--)
  34     if (*--s == (char) c)
  35       return (char *) s;
  36   return NULL;
  37 }
  38
  39 static void
  40 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
  41 {
  42   char *res = CALL (impl, s, c, n);
  43   if (res != exp_res)
  44     {
  45       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  46              res, exp_res);
  47       ret = 1;
  48       return;
  49     }
  50 }
  51
  52 static void
  53 do_test (size_t align, size_t pos, size_t len, int seek_char)
  54 {
  55   size_t i;
  56   char *result;
  57
  58   align &= 7;
  59   if (align + len >= page_size)
  60     return;
  61
  62   for (i = 0; i < len; ++i)
  63     {
  64       buf1[align + i] = 1 + 23 * i % 127;
  65       if (buf1[align + i] == seek_char)
  66         buf1[align + i] = seek_char + 1;
  67     }
  68   buf1[align + len] = 0;
  69
  70   if (pos < len)
  71     {
  72       buf1[align + pos] = seek_char;
  73       buf1[align + len] = -seek_char;
  74       result = (char *) (buf1 + align + pos);
  75     }
  76   else
  77     {
  78       result = NULL;
  79       buf1[align + len] = seek_char;
  80     }
  81
  82   FOR_EACH_IMPL (impl, 0)
  83     do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
  84 }
  85
  86 static void
  87 do_random_tests (void)
  88 {
  89   size_t i, j, n, align, pos, len;
  90   int seek_char;
  91   char *result;
  92   unsigned char *p = buf1 + page_size - 512;
  93
  94   for (n = 0; n < ITERATIONS; n++)
  95     {
  96       align = random () & 15;
  97       pos = random () & 511;
  98       if (pos + align >= 512)
  99         pos = 511 - align - (random () & 7);
 100       len = random () & 511;
 101       if (pos >= len)
 102         len = pos + (random () & 7);
 103       if (len + align >= 512)
 104         len = 512 - align - (random () & 7);
 105       seek_char = random () & 255;
 106       j = len + align + 64;
 107       if (j > 512)
 108         j = 512;
 109
 110       for (i = 0; i < j; i++)
 111         {
 112           if (i == pos + align)
 113             p[i] = seek_char;
 114           else
 115             {
 116               p[i] = random () & 255;
 117               if (p[i] == seek_char)
 118                 p[i] = seek_char + 13;
 119             }
 120         }
 121
 122       if (pos < len)
 123         result = (char *) (p + pos + align);
 124       else
 125         result = NULL;
 126
 127       FOR_EACH_IMPL (impl, 1)
 128         if (CALL (impl, (char *) (p + align), seek_char, len) != result)
 129           {
 130             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 131                    n, impl->name, align, seek_char, len, pos,
 132                    CALL (impl, (char *) (p + align), seek_char, len),
 133                    result, p);
 134             ret = 1;
 135           }
 136     }
 137 }
 138
 139 int
 140 test_main (void)
 141 {
 142   size_t i;
 143
 144   test_init ();
 145
 146   printf ("%20s", "");
 147   FOR_EACH_IMPL (impl, 0)
 148     printf ("\t%s", impl->name);
 149   putchar ('\n');
 150
 151   for (i = 1; i < 8; ++i)
 152     {
 153       /* Test len == 0.  */
 154       do_test (i, i, 0, 0);
 155       do_test (i, i, 0, 23);
 156
 157       do_test (0, 16 << i, 2048, 23);
 158       do_test (i, 64, 256, 23);
 159       do_test (0, 16 << i, 2048, 0);
 160       do_test (i, 64, 256, 0);
 161
 162       do_test (0, i, 256, 23);
 163       do_test (0, i, 256, 0);
 164       do_test (i, i, 256, 23);
 165       do_test (i, i, 256, 0);
 166
 167     }
 168   for (i = 1; i < 32; ++i)
 169     {
 170       do_test (0, i, i + 1, 23);
 171       do_test (0, i, i + 1, 0);
 172       do_test (i, i, i + 1, 23);
 173       do_test (i, i, i + 1, 0);
 174
 175       do_test (0, 1, i + 1, 23);
 176       do_test (0, 2, i + 1, 0);
 177       do_test (i, 1, i + 1, 23);
 178       do_test (i, 2, i + 1, 0);
 179     }
 180
 181   do_random_tests ();
 182   return ret;
 183 }
 184
 185 #include <support/test-driver.c>