string/test-memchr.c

   1 /* Test and measure memchr functions.
   2    Copyright (C) 1999, 2002, 2003, 2005, 2009 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 #include "test-string.h"
  22
  23 typedef char *(*proto_t) (const char *, int, size_t);
  24 char *simple_memchr (const char *, int, size_t);
  25
  26 IMPL (simple_memchr, 0)
  27 IMPL (memchr, 1)
  28
  29 char *
  30 simple_memchr (const char *s, int c, size_t n)
  31 {
  32   while (n--)
  33     if (*s++ == (char) c)
  34       return (char *) s - 1;
  35   return NULL;
  36 }
  37
  38 static void
  39 do_one_test (impl_t *impl, const char *s, int c, size_t n, char *exp_res)
  40 {
  41   char *res = CALL (impl, s, c, n);
  42   if (res != exp_res)
  43     {
  44       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  45              res, exp_res);
  46       ret = 1;
  47       return;
  48     }
  49
  50   if (HP_TIMING_AVAIL)
  51     {
  52       hp_timing_t start __attribute ((unused));
  53       hp_timing_t stop __attribute ((unused));
  54       hp_timing_t best_time = ~ (hp_timing_t) 0;
  55       size_t i;
  56
  57       for (i = 0; i < 32; ++i)
  58         {
  59           HP_TIMING_NOW (start);
  60           CALL (impl, s, c, n);
  61           HP_TIMING_NOW (stop);
  62           HP_TIMING_BEST (best_time, start, stop);
  63         }
  64
  65       printf ("\t%zd", (size_t) best_time);
  66     }
  67 }
  68
  69 static void
  70 do_test (size_t align, size_t pos, size_t len, int seek_char)
  71 {
  72   size_t i;
  73   char *result;
  74
  75   align &= 7;
  76   if (align + len >= page_size)
  77     return;
  78
  79   for (i = 0; i < len; ++i)
  80     {
  81       buf1[align + i] = 1 + 23 * i % 127;
  82       if (buf1[align + i] == seek_char)
  83         buf1[align + i] = seek_char + 1;
  84     }
  85   buf1[align + len] = 0;
  86
  87   if (pos < len)
  88     {
  89       buf1[align + pos] = seek_char;
  90       buf1[align + len] = -seek_char;
  91       result = (char *) (buf1 + align + pos);
  92     }
  93   else
  94     {
  95       result = NULL;
  96       buf1[align + len] = seek_char;
  97     }
  98
  99   if (HP_TIMING_AVAIL)
 100     printf ("Length %4zd, alignment %2zd:", pos, align);
 101
 102   FOR_EACH_IMPL (impl, 0)
 103     do_one_test (impl, (char *) (buf1 + align), seek_char, len, result);
 104
 105   if (HP_TIMING_AVAIL)
 106     putchar ('\n');
 107 }
 108
 109 static void
 110 do_random_tests (void)
 111 {
 112   size_t i, j, n, align, pos, len;
 113   int seek_char;
 114   char *result;
 115   unsigned char *p = buf1 + page_size - 512;
 116
 117   for (n = 0; n < ITERATIONS; n++)
 118     {
 119       align = random () & 15;
 120       pos = random () & 511;
 121       if (pos + align >= 512)
 122         pos = 511 - align - (random () & 7);
 123       len = random () & 511;
 124       if (pos >= len)
 125         len = pos + (random () & 7);
 126       if (len + align >= 512)
 127         len = 512 - align - (random () & 7);
 128       seek_char = random () & 255;
 129       j = len + align + 64;
 130       if (j > 512)
 131         j = 512;
 132
 133       for (i = 0; i < j; i++)
 134         {
 135           if (i == pos + align)
 136             p[i] = seek_char;
 137           else
 138             {
 139               p[i] = random () & 255;
 140               if (i < pos + align && p[i] == seek_char)
 141                 p[i] = seek_char + 13;
 142             }
 143         }
 144
 145       if (pos < len)
 146         {
 147           size_t r = random ();
 148           if ((r & 31) == 0)
 149             len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
 150           result = (char *) (p + pos + align);
 151         }
 152       else
 153         result = NULL;
 154
 155       FOR_EACH_IMPL (impl, 1)
 156         if (CALL (impl, (char *) (p + align), seek_char, len) != result)
 157           {
 158             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 159                    n, impl->name, align, seek_char, len, pos,
 160                    CALL (impl, (char *) (p + align), seek_char, len),
 161                    result, p);
 162             ret = 1;
 163           }
 164     }
 165 }
 166
 167 int
 168 test_main (void)
 169 {
 170   size_t i;
 171
 172   test_init ();
 173
 174   printf ("%20s", "");
 175   FOR_EACH_IMPL (impl, 0)
 176     printf ("\t%s", impl->name);
 177   putchar ('\n');
 178
 179   for (i = 1; i < 8; ++i)
 180     {
 181       do_test (0, 16 << i, 2048, 23);
 182       do_test (i, 64, 256, 23);
 183       do_test (0, 16 << i, 2048, 0);
 184       do_test (i, 64, 256, 0);
 185     }
 186   for (i = 1; i < 32; ++i)
 187     {
 188       do_test (0, i, i + 1, 23);
 189       do_test (0, i, i + 1, 0);
 190     }
 191
 192   do_random_tests ();
 193   return ret;
 194 }
 195
 196 #include "../test-skeleton.c"