string/test-strnlen.c

   1 /* Test and measure strlen 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 "strnlen"
  22 #include "test-string.h"
  23
  24 typedef size_t (*proto_t) (const char *, size_t);
  25 size_t simple_strnlen (const char *, size_t);
  26
  27 IMPL (simple_strnlen, 0)
  28 IMPL (strnlen, 1)
  29
  30 size_t
  31 simple_strnlen (const char *s, size_t maxlen)
  32 {
  33   size_t i;
  34
  35   for (i = 0; i < maxlen && s[i]; ++i);
  36   return i;
  37 }
  38
  39 static void
  40 do_one_test (impl_t *impl, const char *s, size_t maxlen, size_t exp_len)
  41 {
  42   size_t len = CALL (impl, s, maxlen);
  43   if (len != exp_len)
  44     {
  45       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  46              len, exp_len);
  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, maxlen);
  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 len, size_t maxlen, int max_char)
  72 {
  73   size_t i;
  74
  75   align &= 7;
  76   if (align + len >= page_size)
  77     return;
  78
  79   for (i = 0; i < len; ++i)
  80     buf1[align + i] = 1 + 7 * i % max_char;
  81   buf1[align + len] = 0;
  82
  83   if (HP_TIMING_AVAIL)
  84     printf ("Length %4zd, alignment %2zd:", len, align);
  85
  86   FOR_EACH_IMPL (impl, 0)
  87     do_one_test (impl, (char *) (buf1 + align), maxlen, MIN (len, maxlen));
  88
  89   if (HP_TIMING_AVAIL)
  90     putchar ('\n');
  91 }
  92
  93 static void
  94 do_random_tests (void)
  95 {
  96   size_t i, j, n, align, len;
  97   unsigned char *p = buf1 + page_size - 512;
  98
  99   for (n = 0; n < ITERATIONS; n++)
 100     {
 101       align = random () & 15;
 102       len = random () & 511;
 103       if (len + align > 510)
 104         len = 511 - align - (random () & 7);
 105       j = len + align + 64;
 106       if (j > 512)
 107         j = 512;
 108
 109       for (i = 0; i < j; i++)
 110         {
 111           if (i == len + align)
 112             p[i] = 0;
 113           else
 114             {
 115               p[i] = random () & 255;
 116               if (i >= align && i < len + align && !p[i])
 117                 p[i] = (random () & 127) + 1;
 118             }
 119         }
 120
 121       FOR_EACH_IMPL (impl, 1)
 122         {
 123           if (len > 0
 124               && CALL (impl, (char *) (p + align), len - 1) != len - 1)
 125             {
 126               error (0, 0, "Iteration %zd (limited) - wrong result in function %s (%zd) %zd != %zd, p %p",
 127                      n, impl->name, align,
 128                      CALL (impl, (char *) (p + align), len - 1), len - 1, p);
 129               ret = 1;
 130             }
 131           if (CALL (impl, (char *) (p + align), len) != len)
 132             {
 133               error (0, 0, "Iteration %zd (exact) - wrong result in function %s (%zd) %zd != %zd, p %p",
 134                      n, impl->name, align,
 135                      CALL (impl, (char *) (p + align), len), len, p);
 136               ret = 1;
 137             }
 138           if (CALL (impl, (char *) (p + align), len + 1) != len)
 139             {
 140               error (0, 0, "Iteration %zd (long) - wrong result in function %s (%zd) %zd != %zd, p %p",
 141                      n, impl->name, align,
 142                      CALL (impl, (char *) (p + align), len + 1), len, p);
 143               ret = 1;
 144             }
 145         }
 146     }
 147 }
 148
 149 int
 150 test_main (void)
 151 {
 152   size_t i;
 153
 154   test_init ();
 155
 156   printf ("%20s", "");
 157   FOR_EACH_IMPL (impl, 0)
 158     printf ("\t%s", impl->name);
 159   putchar ('\n');
 160
 161   for (i = 1; i < 8; ++i)
 162     {
 163       do_test (0, i, i - 1, 127);
 164       do_test (0, i, i, 127);
 165       do_test (0, i, i + 1, 127);
 166     }
 167
 168   for (i = 1; i < 8; ++i)
 169     {
 170       do_test (i, i, i - 1, 127);
 171       do_test (i, i, i, 127);
 172       do_test (i, i, i + 1, 127);
 173     }
 174
 175   for (i = 2; i <= 10; ++i)
 176     {
 177       do_test (0, 1 << i, 5000, 127);
 178       do_test (1, 1 << i, 5000, 127);
 179     }
 180
 181   for (i = 1; i < 8; ++i)
 182     do_test (0, i, 5000, 255);
 183
 184   for (i = 1; i < 8; ++i)
 185     do_test (i, i, 5000, 255);
 186
 187   for (i = 2; i <= 10; ++i)
 188     {
 189       do_test (0, 1 << i, 5000, 255);
 190       do_test (1, 1 << i, 5000, 255);
 191     }
 192
 193   do_random_tests ();
 194   return ret;
 195 }
 196
 197 #include "../test-skeleton.c"