string/test-strlen.c

   1 /* Test and measure strlen functions.
   2    Copyright (C) 1999, 2002, 2003 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #define TEST_MAIN
  22 #include "test-string.h"
  23
  24 typedef size_t (*proto_t) (const char *);
  25 size_t simple_strlen (const char *);
  26 size_t builtin_strlen (const char *);
  27
  28 IMPL (simple_strlen, 0)
  29 IMPL (builtin_strlen, 0)
  30 IMPL (strlen, 1)
  31
  32 size_t
  33 simple_strlen (const char *s)
  34 {
  35   const char *p;
  36
  37   for (p = s; *p; ++p);
  38   return p - s;
  39 }
  40
  41 size_t
  42 builtin_strlen (const char *p)
  43 {
  44   return __builtin_strlen (p);
  45 }
  46
  47 static void
  48 do_one_test (impl_t *impl, const char *s, size_t exp_len)
  49 {
  50   size_t len = CALL (impl, s);
  51   if (len != exp_len)
  52     {
  53       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  54              len, exp_len);
  55       ret = 1;
  56       return;
  57     }
  58
  59   if (HP_TIMING_AVAIL)
  60     {
  61       hp_timing_t start __attribute ((unused));
  62       hp_timing_t stop __attribute ((unused));
  63       hp_timing_t best_time = ~ (hp_timing_t) 0;
  64       size_t i;
  65
  66       for (i = 0; i < 32; ++i)
  67         {
  68           HP_TIMING_NOW (start);
  69           CALL (impl, s);
  70           HP_TIMING_NOW (stop);
  71           HP_TIMING_BEST (best_time, start, stop);
  72         }
  73
  74       printf ("\t%zd", (size_t) best_time);
  75     }
  76 }
  77
  78 static void
  79 do_test (size_t align, size_t len, int max_char)
  80 {
  81   size_t i;
  82
  83   align &= 7;
  84   if (align + len >= page_size)
  85     return;
  86
  87   for (i = 0; i < len; ++i)
  88     buf1[align + i] = 1 + 7 * i % max_char;
  89   buf1[align + len] = 0;
  90
  91   if (HP_TIMING_AVAIL)
  92     printf ("Length %4zd, alignment %2zd:", len, align);
  93
  94   FOR_EACH_IMPL (impl, 0)
  95     do_one_test (impl, buf1 + align, len);
  96
  97   if (HP_TIMING_AVAIL)
  98     putchar ('\n');
  99 }
 100
 101 static void
 102 do_random_tests (void)
 103 {
 104   size_t i, j, n, align, len;
 105   unsigned char *p = buf1 + page_size - 512;
 106
 107   for (n = 0; n < ITERATIONS; n++)
 108     {
 109       align = random () & 15;
 110       len = random () & 511;
 111       if (len + align > 510)
 112         len = 511 - align - (random () & 7);
 113       j = len + align + 64;
 114       if (j > 512)
 115         j = 512;
 116
 117       for (i = 0; i < j; i++)
 118         {
 119           if (i == len + align)
 120             p[i] = 0;
 121           else
 122             {
 123               p[i] = random () & 255;
 124               if (i >= align && i < len + align && !p[i])
 125                 p[i] = (random () & 127) + 1;
 126             }
 127         }
 128
 129       FOR_EACH_IMPL (impl, 1)
 130         if (CALL (impl, p + align) != len)
 131           {
 132             error (0, 0, "Iteration %zd - wrong result in function %s (%zd) %zd != %zd, p %p",
 133                    n, impl->name, align, CALL (impl, p + align), len, p);
 134             ret = 1;
 135           }
 136     }
 137 }
 138
 139 int
 140 test_main (void)
 141 {
 142   size_t i;
 143
 144   test_init ();
 145
 146   printf ("%20s", "");
 147   FOR_EACH_IMPL (impl, 0)
 148     printf ("\t%s", impl->name);
 149   putchar ('\n');
 150
 151   for (i = 1; i < 8; ++i)
 152     do_test (0, i, 127);
 153
 154   for (i = 1; i < 8; ++i)
 155     do_test (i, i, 127);
 156
 157   for (i = 2; i <= 10; ++i)
 158     {
 159       do_test (0, 1 << i, 127);
 160       do_test (1, 1 << i, 127);
 161     }
 162
 163   for (i = 1; i < 8; ++i)
 164     do_test (0, i, 255);
 165
 166   for (i = 1; i < 8; ++i)
 167     do_test (i, i, 255);
 168
 169   for (i = 2; i <= 10; ++i)
 170     {
 171       do_test (0, 1 << i, 255);
 172       do_test (1, 1 << i, 255);
 173     }
 174
 175   do_random_tests ();
 176   return ret;
 177 }
 178
 179 #include "../test-skeleton.c"