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 /* Also check the generic implementation.  */
  28 #undef weak_alias
  29 #define weak_alias(a, b)
  30 #define MEMRCHR __memrchr_default
  31 #include "string/memrchr.c"
  32 IMPL (__memrchr_default, 1)
  33
  34 /* Naive implementation to verify results.  */
  35 char *
  36 simple_memrchr (const char *s, int c, size_t n)
  37 {
  38   s = s + n;
  39   while (n--)
  40     if (*--s == (char) c)
  41       return (char *) s;
  42   return NULL;
  43 }
  44
  45 static void
  46 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
  47 {
  48   char *res = CALL (impl, s, c, n);
  49   if (res != exp_res)
  50     {
  51       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  52              res, exp_res);
  53       ret = 1;
  54       return;
  55     }
  56 }
  57
  58 static void
  59 do_test (size_t align, size_t pos, size_t len, int seek_char)
  60 {
  61   size_t i;
  62   char *result;
  63
  64   align &= 7;
  65   if (align + len >= page_size)
  66     return;
  67
  68   for (i = 0; i < len; ++i)
  69     {
  70       buf1[align + i] = 1 + 23 * i % 127;
  71       if (buf1[align + i] == seek_char)
  72         buf1[align + i] = seek_char + 1;
  73     }
  74   buf1[align + len] = 0;
  75
  76   if (pos < len)
  77     {
  78       buf1[align + pos] = seek_char;
  79       buf1[align + len] = -seek_char;
  80       result = (char *) (buf1 + align + pos);
  81     }
  82   else
  83     {
  84       result = NULL;
  85       buf1[align + len] = seek_char;
  86     }
  87
  88   FOR_EACH_IMPL (impl, 0)
  89     do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
  90 }
  91
  92 static void
  93 do_random_tests (void)
  94 {
  95   size_t i, j, n, align, pos, len;
  96   int seek_char;
  97   char *result;
  98   unsigned char *p = buf1 + page_size - 512;
  99
 100   for (n = 0; n < ITERATIONS; n++)
 101     {
 102       align = random () & 15;
 103       pos = random () & 511;
 104       if (pos + align >= 512)
 105         pos = 511 - align - (random () & 7);
 106       len = random () & 511;
 107       if (pos >= len)
 108         len = pos + (random () & 7);
 109       if (len + align >= 512)
 110         len = 512 - align - (random () & 7);
 111       seek_char = random () & 255;
 112       j = len + align + 64;
 113       if (j > 512)
 114         j = 512;
 115
 116       for (i = 0; i < j; i++)
 117         {
 118           if (i == pos + align)
 119             p[i] = seek_char;
 120           else
 121             {
 122               p[i] = random () & 255;
 123               if (p[i] == seek_char)
 124                 p[i] = seek_char + 13;
 125             }
 126         }
 127
 128       if (pos < len)
 129         result = (char *) (p + pos + align);
 130       else
 131         result = NULL;
 132
 133       FOR_EACH_IMPL (impl, 1)
 134         if (CALL (impl, (char *) (p + align), seek_char, len) != result)
 135           {
 136             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 137                    n, impl->name, align, seek_char, len, pos,
 138                    CALL (impl, (char *) (p + align), seek_char, len),
 139                    result, p);
 140             ret = 1;
 141           }
 142     }
 143 }
 144
 145 int
 146 test_main (void)
 147 {
 148   size_t i;
 149
 150   test_init ();
 151
 152   printf ("%20s", "");
 153   FOR_EACH_IMPL (impl, 0)
 154     printf ("\t%s", impl->name);
 155   putchar ('\n');
 156
 157   for (i = 1; i < 8; ++i)
 158     {
 159       /* Test len == 0.  */
 160       do_test (i, i, 0, 0);
 161       do_test (i, i, 0, 23);
 162
 163       do_test (0, 16 << i, 2048, 23);
 164       do_test (i, 64, 256, 23);
 165       do_test (0, 16 << i, 2048, 0);
 166       do_test (i, 64, 256, 0);
 167
 168       do_test (0, i, 256, 23);
 169       do_test (0, i, 256, 0);
 170       do_test (i, i, 256, 23);
 171       do_test (i, i, 256, 0);
 172
 173     }
 174   for (i = 1; i < 32; ++i)
 175     {
 176       do_test (0, i, i + 1, 23);
 177       do_test (0, i, i + 1, 0);
 178       do_test (i, i, i + 1, 23);
 179       do_test (i, i, i + 1, 0);
 180
 181       do_test (0, 1, i + 1, 23);
 182       do_test (0, 2, i + 1, 0);
 183       do_test (i, 1, i + 1, 23);
 184       do_test (i, 2, i + 1, 0);
 185     }
 186
 187   do_random_tests ();
 188   return ret;
 189 }
 190
 191 #include <support/test-driver.c>