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