string/test-memchr.c

   1 /* Test and measure memchr functions.
   2    Copyright (C) 1999-2012 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 #define TEST_MAIN
  21 #define TEST_NAME "memchr"
  22 #include "test-string.h"
  23
  24 typedef char *(*proto_t) (const char *, int, size_t);
  25 char *simple_memchr (const char *, int, size_t);
  26
  27 IMPL (simple_memchr, 0)
  28 IMPL (memchr, 1)
  29
  30 char *
  31 simple_memchr (const char *s, int c, size_t n)
  32 {
  33   while (n--)
  34     if (*s++ == (char) c)
  35       return (char *) s - 1;
  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   if (HP_TIMING_AVAIL)
  52     {
  53       hp_timing_t start __attribute ((unused));
  54       hp_timing_t stop __attribute ((unused));
  55       hp_timing_t best_time = ~ (hp_timing_t) 0;
  56       size_t i;
  57
  58       for (i = 0; i < 32; ++i)
  59         {
  60           HP_TIMING_NOW (start);
  61           CALL (impl, s, c, n);
  62           HP_TIMING_NOW (stop);
  63           HP_TIMING_BEST (best_time, start, stop);
  64         }
  65
  66       printf ("\t%zd", (size_t) best_time);
  67     }
  68 }
  69
  70 static void
  71 do_test (size_t align, size_t pos, size_t len, int seek_char)
  72 {
  73   size_t i;
  74   char *result;
  75
  76   align &= 7;
  77   if (align + len >= page_size)
  78     return;
  79
  80   for (i = 0; i < len; ++i)
  81     {
  82       buf1[align + i] = 1 + 23 * i % 127;
  83       if (buf1[align + i] == seek_char)
  84         buf1[align + i] = seek_char + 1;
  85     }
  86   buf1[align + len] = 0;
  87
  88   if (pos < len)
  89     {
  90       buf1[align + pos] = seek_char;
  91       buf1[align + len] = -seek_char;
  92       result = (char *) (buf1 + align + pos);
  93     }
  94   else
  95     {
  96       result = NULL;
  97       buf1[align + len] = seek_char;
  98     }
  99
 100   if (HP_TIMING_AVAIL)
 101     printf ("Length %4zd, alignment %2zd:", pos, align);
 102
 103   FOR_EACH_IMPL (impl, 0)
 104     do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
 105
 106   if (HP_TIMING_AVAIL)
 107     putchar ('\n');
 108 }
 109
 110 static void
 111 do_random_tests (void)
 112 {
 113   size_t i, j, n, align, pos, len;
 114   int seek_char;
 115   char *result;
 116   unsigned char *p = buf1 + page_size - 512;
 117
 118   for (n = 0; n < ITERATIONS; n++)
 119     {
 120       align = random () & 15;
 121       pos = random () & 511;
 122       if (pos + align >= 512)
 123         pos = 511 - align - (random () & 7);
 124       len = random () & 511;
 125       if (pos >= len)
 126         len = pos + (random () & 7);
 127       if (len + align >= 512)
 128         len = 512 - align - (random () & 7);
 129       seek_char = random () & 255;
 130       j = len + align + 64;
 131       if (j > 512)
 132         j = 512;
 133
 134       for (i = 0; i < j; i++)
 135         {
 136           if (i == pos + align)
 137             p[i] = seek_char;
 138           else
 139             {
 140               p[i] = random () & 255;
 141               if (i < pos + align && p[i] == seek_char)
 142                 p[i] = seek_char + 13;
 143             }
 144         }
 145
 146       if (pos < len)
 147         {
 148           size_t r = random ();
 149           if ((r & 31) == 0)
 150             len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
 151           result = (char *) (p + pos + align);
 152         }
 153       else
 154         result = NULL;
 155
 156       FOR_EACH_IMPL (impl, 1)
 157         if (CALL (impl, (char *) (p + align), seek_char, len) != result)
 158           {
 159             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 160                    n, impl->name, align, seek_char, len, pos,
 161                    CALL (impl, (char *) (p + align), seek_char, len),
 162                    result, p);
 163             ret = 1;
 164           }
 165     }
 166 }
 167
 168 int
 169 test_main (void)
 170 {
 171   size_t i;
 172
 173   test_init ();
 174
 175   printf ("%20s", "");
 176   FOR_EACH_IMPL (impl, 0)
 177     printf ("\t%s", impl->name);
 178   putchar ('\n');
 179
 180   for (i = 1; i < 8; ++i)
 181     {
 182       do_test (0, 16 << i, 2048, 23);
 183       do_test (i, 64, 256, 23);
 184       do_test (0, 16 << i, 2048, 0);
 185       do_test (i, 64, 256, 0);
 186     }
 187   for (i = 1; i < 32; ++i)
 188     {
 189       do_test (0, i, i + 1, 23);
 190       do_test (0, i, i + 1, 0);
 191     }
 192
 193   do_random_tests ();
 194   return ret;
 195 }
 196
 197 #include "../test-skeleton.c"