string/test-rawmemchr.c

   1 /* Test and measure memchr functions.
   2    Copyright (C) 1999-2022 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 #include <assert.h>
  20
  21 #define TEST_MAIN
  22 #define TEST_NAME "rawmemchr"
  23 #include "test-string.h"
  24
  25 typedef char *(*proto_t) (const char *, int);
  26 char *simple_rawmemchr (const char *, int);
  27
  28 IMPL (simple_rawmemchr, 0)
  29 IMPL (rawmemchr, 1)
  30
  31 char *
  32 simple_rawmemchr (const char *s, int c)
  33 {
  34   while (1)
  35     if (*s++ == (char) c)
  36       return (char *) s - 1;
  37   return NULL;
  38 }
  39
  40 static void
  41 do_one_test (impl_t *impl, const char *s, int c, char *exp_res)
  42 {
  43   char *res = CALL (impl, s, c);
  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   assert (pos < len);
  72
  73   buf1[align + pos] = seek_char;
  74   buf1[align + len] = -seek_char;
  75   result = (char *) (buf1 + align + pos);
  76
  77   FOR_EACH_IMPL (impl, 0)
  78     do_one_test (impl, (char *) (buf1 + align), seek_char, result);
  79 }
  80
  81 static void
  82 do_random_tests (void)
  83 {
  84   size_t i, j, n, align, pos, len;
  85   int seek_char;
  86   char *result;
  87   unsigned char *p = buf1 + page_size - 512;
  88
  89   for (n = 0; n < ITERATIONS; n++)
  90     {
  91       align = random () & 15;
  92       pos = random () & 511;
  93       if (pos + align >= 512)
  94         pos = 511 - align - (random () & 7);
  95       len = random () & 511;
  96       if (len + align >= 512)
  97         len = 512 - align - (random () & 7);
  98       if (pos >= len)
  99         continue;
 100       seek_char = random () & 255;
 101       j = len + align + 64;
 102       if (j > 512)
 103         j = 512;
 104
 105       for (i = 0; i < j; i++)
 106         {
 107           if (i == pos + align)
 108             p[i] = seek_char;
 109           else
 110             {
 111               p[i] = random () & 255;
 112               if (i < pos + align && p[i] == seek_char)
 113                 p[i] = seek_char + 13;
 114             }
 115         }
 116
 117       assert (pos < len);
 118       size_t r = random ();
 119       if ((r & 31) == 0)
 120         len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
 121       result = (char *) (p + pos + align);
 122
 123       FOR_EACH_IMPL (impl, 1)
 124         if (CALL (impl, (char *) (p + align), seek_char) != result)
 125           {
 126             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 127                    n, impl->name, align, seek_char, len, pos,
 128                    CALL (impl, (char *) (p + align), seek_char),
 129                    result, p);
 130             ret = 1;
 131           }
 132     }
 133 }
 134
 135 int
 136 test_main (void)
 137 {
 138   size_t i;
 139
 140   test_init ();
 141
 142   printf ("%20s", "");
 143   FOR_EACH_IMPL (impl, 0)
 144     printf ("\t%s", impl->name);
 145   putchar ('\n');
 146
 147   for (i = 1; i < 7; ++i)
 148     {
 149       do_test (0, 16 << i, 2048, 23);
 150       do_test (i, 64, 256, 23);
 151       do_test (0, 16 << i, 2048, 0);
 152       do_test (i, 64, 256, 0);
 153     }
 154   for (i = 1; i < 32; ++i)
 155     {
 156       do_test (0, i, i + 1, 23);
 157       do_test (0, i, i + 1, 0);
 158     }
 159
 160   do_random_tests ();
 161   return ret;
 162 }
 163
 164 #include <support/test-driver.c>