string/test-memrchr.c

   1 /* Test and measure memrchr functions.
   2    Copyright (C) 2013-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #define TEST_MAIN
  21 #define TEST_NAME "memrchr"
  22 #include "test-string.h"
  23
  24 typedef char *(*proto_t) (const char *, int, size_t);
  25 char *simple_memrchr (const char *, int, size_t);
  26
  27 IMPL (simple_memrchr, 0)
  28 IMPL (memrchr, 1)
  29
  30 char *
  31 simple_memrchr (const char *s, int c, size_t n)
  32 {
  33   s = s + n;
  34   while (n--)
  35     if (*--s == (char) c)
  36       return (char *) s;
  37   return NULL;
  38 }
  39
  40 static void
  41 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
  42 {
  43   char *res = CALL (impl, s, c, n);
  44   if (res != exp_res)
  45     {
  46       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  47              res, exp_res);
  48       ret = 1;
  49       return;
  50     }
  51 }
  52
  53 static void
  54 do_test (size_t align, size_t pos, size_t len, int seek_char)
  55 {
  56   size_t i;
  57   char *result;
  58
  59   align &= 7;
  60   if (align + len >= page_size)
  61     return;
  62
  63   for (i = 0; i < len; ++i)
  64     {
  65       buf1[align + i] = 1 + 23 * i % 127;
  66       if (buf1[align + i] == seek_char)
  67         buf1[align + i] = seek_char + 1;
  68     }
  69   buf1[align + len] = 0;
  70
  71   if (pos < len)
  72     {
  73       buf1[align + pos] = seek_char;
  74       buf1[align + len] = -seek_char;
  75       result = (char *) (buf1 + align + pos);
  76     }
  77   else
  78     {
  79       result = NULL;
  80       buf1[align + len] = seek_char;
  81     }
  82
  83   FOR_EACH_IMPL (impl, 0)
  84     do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
  85 }
  86
  87 static void
  88 do_random_tests (void)
  89 {
  90   size_t i, j, n, align, pos, len;
  91   int seek_char;
  92   char *result;
  93   unsigned char *p = buf1 + page_size - 512;
  94
  95   for (n = 0; n < ITERATIONS; n++)
  96     {
  97       align = random () & 15;
  98       pos = random () & 511;
  99       if (pos + align >= 512)
 100         pos = 511 - align - (random () & 7);
 101       len = random () & 511;
 102       if (pos >= len)
 103         len = pos + (random () & 7);
 104       if (len + align >= 512)
 105         len = 512 - align - (random () & 7);
 106       seek_char = random () & 255;
 107       j = len + align + 64;
 108       if (j > 512)
 109         j = 512;
 110
 111       for (i = 0; i < j; i++)
 112         {
 113           if (i == pos + align)
 114             p[i] = seek_char;
 115           else
 116             {
 117               p[i] = random () & 255;
 118               if (p[i] == seek_char)
 119                 p[i] = seek_char + 13;
 120             }
 121         }
 122
 123       if (pos < len)
 124         result = (char *) (p + pos + align);
 125       else
 126         result = NULL;
 127
 128       FOR_EACH_IMPL (impl, 1)
 129         if (CALL (impl, (char *) (p + align), seek_char, len) != result)
 130           {
 131             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 132                    n, impl->name, align, seek_char, len, pos,
 133                    CALL (impl, (char *) (p + align), seek_char, len),
 134                    result, p);
 135             ret = 1;
 136           }
 137     }
 138 }
 139
 140 int
 141 test_main (void)
 142 {
 143   size_t i;
 144
 145   test_init ();
 146
 147   printf ("%20s", "");
 148   FOR_EACH_IMPL (impl, 0)
 149     printf ("\t%s", impl->name);
 150   putchar ('\n');
 151
 152   for (i = 1; i < 8; ++i)
 153     {
 154       /* Test len == 0.  */
 155       do_test (i, i, 0, 0);
 156       do_test (i, i, 0, 23);
 157
 158       do_test (0, 16 << i, 2048, 23);
 159       do_test (i, 64, 256, 23);
 160       do_test (0, 16 << i, 2048, 0);
 161       do_test (i, 64, 256, 0);
 162
 163       do_test (0, i, 256, 23);
 164       do_test (0, i, 256, 0);
 165       do_test (i, i, 256, 23);
 166       do_test (i, i, 256, 0);
 167
 168     }
 169   for (i = 1; i < 32; ++i)
 170     {
 171       do_test (0, i, i + 1, 23);
 172       do_test (0, i, i + 1, 0);
 173       do_test (i, i, i + 1, 23);
 174       do_test (i, i, i + 1, 0);
 175
 176       do_test (0, 1, i + 1, 23);
 177       do_test (0, 2, i + 1, 0);
 178       do_test (i, 1, i + 1, 23);
 179       do_test (i, 2, i + 1, 0);
 180     }
 181
 182   do_random_tests ();
 183   return ret;
 184 }
 185
 186 #include <support/test-driver.c>