string/test-strlen.c

   1 /* Test and measure STRLEN functions.
   2    Copyright (C) 1999-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #define TEST_MAIN
  20 #ifndef WIDE
  21 # define TEST_NAME "strlen"
  22 #else
  23 # define TEST_NAME "wcslen"
  24 #endif
  25 #include "test-string.h"
  26
  27 #ifndef WIDE
  28 # define STRLEN strlen
  29 # define CHAR char
  30 # define MAX_CHAR CHAR_MAX
  31 #else
  32 # include <wchar.h>
  33 # define STRLEN wcslen
  34 # define CHAR wchar_t
  35 # define MAX_CHAR WCHAR_MAX
  36 #endif
  37
  38 typedef size_t (*proto_t) (const CHAR *);
  39
  40 /* Naive implementation to verify results.  */
  41 size_t
  42 simple_STRLEN (const CHAR *s)
  43 {
  44   const CHAR *p;
  45
  46   for (p = s; *p; ++p);
  47   return p - s;
  48 }
  49
  50 #ifndef WIDE
  51 size_t
  52 builtin_strlen (const CHAR *p)
  53 {
  54   return __builtin_strlen (p);
  55 }
  56 IMPL (builtin_strlen, 0)
  57 #endif
  58
  59 IMPL (STRLEN, 1)
  60
  61
  62 static void
  63 do_one_test (impl_t *impl, const CHAR *s, size_t exp_len)
  64 {
  65   size_t len = CALL (impl, s);
  66   if (len != exp_len)
  67     {
  68       error (0, 0, "Wrong result in function %s %zd %zd", impl->name,
  69              len, exp_len);
  70       ret = 1;
  71       return;
  72     }
  73 }
  74
  75 static void
  76 do_test (size_t align, size_t len)
  77 {
  78   size_t i;
  79
  80   align &= (getpagesize () / sizeof (CHAR)) - 1;
  81   if (align + sizeof (CHAR) * len >= page_size)
  82     return;
  83
  84   CHAR *buf = (CHAR *) (buf1);
  85
  86   for (i = 0; i < len; ++i)
  87     buf[align + i] = 1 + 11111 * i % MAX_CHAR;
  88   buf[align + len] = 0;
  89
  90   FOR_EACH_IMPL (impl, 0)
  91     do_one_test (impl, (CHAR *) (buf + align), len);
  92 }
  93
  94 static void
  95 do_random_tests (void)
  96 {
  97   size_t i, j, n, align, len;
  98   CHAR *p = (CHAR *) (buf1 + page_size - 512 * sizeof (CHAR));
  99
 100   for (n = 0; n < ITERATIONS; n++)
 101     {
 102       align = random () & 15;
 103       len = random () & 511;
 104       if (len + align > 510)
 105         len = 511 - align - (random () & 7);
 106       j = len + align + 64;
 107       if (j > 512)
 108         j = 512;
 109
 110       for (i = 0; i < j; i++)
 111         {
 112           if (i == len + align)
 113             p[i] = 0;
 114           else
 115             {
 116               p[i] = random () & 255;
 117               if (i >= align && i < len + align && !p[i])
 118                 p[i] = (random () & 127) + 1;
 119             }
 120         }
 121
 122       FOR_EACH_IMPL (impl, 1)
 123         if (CALL (impl, (CHAR *) (p + align)) != len)
 124           {
 125             error (0, 0, "Iteration %zd - wrong result in function %s (%zd) %zd != %zd, p %p",
 126                    n, impl->name, align, CALL (impl, (CHAR *) (p + align)),
 127                    len, p);
 128             ret = 1;
 129           }
 130     }
 131 }
 132
 133 int
 134 test_main (void)
 135 {
 136   size_t i;
 137
 138   test_init ();
 139
 140   printf ("%20s", "");
 141   FOR_EACH_IMPL (impl, 0)
 142     printf ("\t%s", impl->name);
 143   putchar ('\n');
 144
 145   /* Checking with only 4 * N alignments for wcslen, other alignments are wrong for wchar_t type arrays*/
 146
 147   for (i = 1; i < 8; ++i)
 148   {
 149     do_test (sizeof (CHAR) * i, i);
 150     do_test (0, i);
 151   }
 152
 153   for (i = 2; i <= 12; ++i)
 154     {
 155       do_test (0, 1 << i);
 156       do_test (sizeof (CHAR) * 7, 1 << i);
 157       do_test (sizeof (CHAR) * i, 1 << i);
 158       do_test (sizeof (CHAR) * i, (size_t)((1 << i) / 1.5));
 159     }
 160
 161   /* Test strings near page boundary */
 162
 163   size_t maxlength = 64 / sizeof (CHAR) - 1;
 164   size_t pagesize = getpagesize () / sizeof (CHAR);
 165
 166   for (i = maxlength ; i > 1; --i)
 167     {
 168       /* String stays on the same page.  */
 169       do_test (pagesize - i, i - 1);
 170       /* String crosses page boundary.  */
 171       do_test (pagesize - i, maxlength);
 172     }
 173
 174   do_random_tests ();
 175   return ret;
 176 }
 177
 178 #include <support/test-driver.c>