string/test-rawmemchr.c

   1 /* Test and measure memchr functions.
   2    Copyright (C) 1999-2017 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    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <assert.h>
  21
  22 #define TEST_MAIN
  23 #define TEST_NAME "rawmemchr"
  24 #include "test-string.h"
  25
  26 typedef char *(*proto_t) (const char *, int);
  27 char *simple_rawmemchr (const char *, int);
  28
  29 IMPL (simple_rawmemchr, 0)
  30 IMPL (rawmemchr, 1)
  31
  32 char *
  33 simple_rawmemchr (const char *s, int c)
  34 {
  35   while (1)
  36     if (*s++ == (char) c)
  37       return (char *) s - 1;
  38   return NULL;
  39 }
  40
  41 static void
  42 do_one_test (impl_t *impl, const char *s, int c, char *exp_res)
  43 {
  44   char *res = CALL (impl, s, c);
  45   if (res != exp_res)
  46     {
  47       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  48              res, exp_res);
  49       ret = 1;
  50       return;
  51     }
  52 }
  53
  54 static void
  55 do_test (size_t align, size_t pos, size_t len, int seek_char)
  56 {
  57   size_t i;
  58   char *result;
  59
  60   align &= 7;
  61   if (align + len >= page_size)
  62     return;
  63
  64   for (i = 0; i < len; ++i)
  65     {
  66       buf1[align + i] = 1 + 23 * i % 127;
  67       if (buf1[align + i] == seek_char)
  68         buf1[align + i] = seek_char + 1;
  69     }
  70   buf1[align + len] = 0;
  71
  72   assert (pos < len);
  73
  74   buf1[align + pos] = seek_char;
  75   buf1[align + len] = -seek_char;
  76   result = (char *) (buf1 + align + pos);
  77
  78   FOR_EACH_IMPL (impl, 0)
  79     do_one_test (impl, (char *) (buf1 + align), seek_char, result);
  80 }
  81
  82 static void
  83 do_random_tests (void)
  84 {
  85   size_t i, j, n, align, pos, len;
  86   int seek_char;
  87   char *result;
  88   unsigned char *p = buf1 + page_size - 512;
  89
  90   for (n = 0; n < ITERATIONS; n++)
  91     {
  92       align = random () & 15;
  93       pos = random () & 511;
  94       if (pos + align >= 512)
  95         pos = 511 - align - (random () & 7);
  96       len = random () & 511;
  97       if (len + align >= 512)
  98         len = 512 - align - (random () & 7);
  99       if (pos >= len)
 100         continue;
 101       seek_char = random () & 255;
 102       j = len + align + 64;
 103       if (j > 512)
 104         j = 512;
 105
 106       for (i = 0; i < j; i++)
 107         {
 108           if (i == pos + align)
 109             p[i] = seek_char;
 110           else
 111             {
 112               p[i] = random () & 255;
 113               if (i < pos + align && p[i] == seek_char)
 114                 p[i] = seek_char + 13;
 115             }
 116         }
 117
 118       assert (pos < len);
 119       size_t r = random ();
 120       if ((r & 31) == 0)
 121         len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
 122       result = (char *) (p + pos + align);
 123
 124       FOR_EACH_IMPL (impl, 1)
 125         if (CALL (impl, (char *) (p + align), seek_char) != result)
 126           {
 127             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 128                    n, impl->name, align, seek_char, len, pos,
 129                    CALL (impl, (char *) (p + align), seek_char),
 130                    result, p);
 131             ret = 1;
 132           }
 133     }
 134 }
 135
 136 int
 137 test_main (void)
 138 {
 139   size_t i;
 140
 141   test_init ();
 142
 143   printf ("%20s", "");
 144   FOR_EACH_IMPL (impl, 0)
 145     printf ("\t%s", impl->name);
 146   putchar ('\n');
 147
 148   for (i = 1; i < 7; ++i)
 149     {
 150       do_test (0, 16 << i, 2048, 23);
 151       do_test (i, 64, 256, 23);
 152       do_test (0, 16 << i, 2048, 0);
 153       do_test (i, 64, 256, 0);
 154     }
 155   for (i = 1; i < 32; ++i)
 156     {
 157       do_test (0, i, i + 1, 23);
 158       do_test (0, i, i + 1, 0);
 159     }
 160
 161   do_random_tests ();
 162   return ret;
 163 }
 164
 165 #include <support/test-driver.c>