string/test-memset.c

   1 /* Test and measure memset functions.
   2    Copyright (C) 1999-2015 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 #ifdef TEST_BZERO
  22 # define TEST_NAME "bzero"
  23 #else
  24 # define TEST_NAME "memset"
  25 #endif
  26 #define MIN_PAGE_SIZE 131072
  27 #include "test-string.h"
  28
  29 char *simple_memset (char *, int, size_t);
  30
  31 #ifdef TEST_BZERO
  32 typedef void (*proto_t) (char *, size_t);
  33 void simple_bzero (char *, size_t);
  34 void builtin_bzero (char *, size_t);
  35
  36 IMPL (simple_bzero, 0)
  37 IMPL (builtin_bzero, 0)
  38 IMPL (bzero, 1)
  39
  40 void
  41 simple_bzero (char *s, size_t n)
  42 {
  43   simple_memset (s, 0, n);
  44 }
  45
  46 void
  47 builtin_bzero (char *s, size_t n)
  48 {
  49   __builtin_bzero (s, n);
  50 }
  51 #else
  52 typedef char *(*proto_t) (char *, int, size_t);
  53 char *builtin_memset (char *, int, size_t);
  54
  55 IMPL (simple_memset, 0)
  56 IMPL (builtin_memset, 0)
  57 IMPL (memset, 1)
  58
  59 char *
  60 builtin_memset (char *s, int c, size_t n)
  61 {
  62   return __builtin_memset (s, c, n);
  63 }
  64 #endif
  65
  66 char *
  67 inhibit_loop_to_libcall
  68 simple_memset (char *s, int c, size_t n)
  69 {
  70   char *r = s, *end = s + n;
  71   while (r < end)
  72     *r++ = c;
  73   return s;
  74 }
  75
  76 static void
  77 do_one_test (impl_t *impl, char *s, int c __attribute ((unused)), size_t n)
  78 {
  79   char tstbuf[n];
  80 #ifdef TEST_BZERO
  81   simple_bzero (tstbuf, n);
  82   CALL (impl, s, n);
  83   if (memcmp (s, tstbuf, n) != 0)
  84 #else
  85   char *res = CALL (impl, s, c, n);
  86   if (res != s
  87       || simple_memset (tstbuf, c, n) != tstbuf
  88       || memcmp (s, tstbuf, n) != 0)
  89 #endif
  90     {
  91       error (0, 0, "Wrong result in function %s", impl->name);
  92       ret = 1;
  93       return;
  94     }
  95 }
  96
  97 static void
  98 do_test (size_t align, int c, size_t len)
  99 {
 100   align &= 7;
 101   if (align + len > page_size)
 102     return;
 103
 104   FOR_EACH_IMPL (impl, 0)
 105     do_one_test (impl, (char *) buf1 + align, c, len);
 106 }
 107
 108 #ifndef TEST_BZERO
 109 static void
 110 do_random_tests (void)
 111 {
 112   size_t i, j, k, n, align, len, size;
 113   int c, o;
 114   unsigned char *p, *res;
 115
 116   for (i = 0; i < 65536; ++i)
 117     buf2[i] = random () & 255;
 118
 119   for (n = 0; n < ITERATIONS; n++)
 120     {
 121       if ((random () & 31) == 0)
 122         size = 65536;
 123       else
 124         size = 512;
 125       p = buf1 + page_size - size;
 126       len = random () & (size - 1);
 127       align = size - len - (random () & 31);
 128       if (align > size)
 129         align = size - len;
 130       if ((random () & 7) == 0)
 131         align &= ~63;
 132       if ((random () & 7) == 0)
 133         c = 0;
 134       else
 135         c = random () & 255;
 136       o = random () & 255;
 137       if (o == c)
 138         o = (c + 1) & 255;
 139       j = len + align + 128;
 140       if (j > size)
 141         j = size;
 142       if (align >= 128)
 143         k = align - 128;
 144       else
 145         k = 0;
 146       for (i = k; i < align; ++i)
 147         p[i] = o;
 148       for (i = align + len; i < j; ++i)
 149         p[i] = o;
 150
 151       FOR_EACH_IMPL (impl, 1)
 152         {
 153           for (i = 0; i < len; ++i)
 154             {
 155               p[i + align] = buf2[i];
 156               if (p[i + align] == c)
 157                 p[i + align] = o;
 158             }
 159           res = (unsigned char *) CALL (impl, (char *) p + align, c, len);
 160           if (res != p + align)
 161             {
 162               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd) %p != %p",
 163                      n, impl->name, align, c, len, res, p + align);
 164               ret = 1;
 165             }
 166           for (i = k; i < align; ++i)
 167             if (p[i] != o)
 168               {
 169                 error (0, 0, "Iteration %zd - garbage before %s (%zd, %d, %zd)",
 170                        n, impl->name, align, c, len);
 171                 ret = 1;
 172                 break;
 173               }
 174           for (; i < align + len; ++i)
 175             if (p[i] != c)
 176               {
 177                 error (0, 0, "Iteration %zd - not cleared correctly %s (%zd, %d, %zd)",
 178                        n, impl->name, align, c, len);
 179                 ret = 1;
 180                 break;
 181               }
 182           for (; i < j; ++i)
 183             if (p[i] != o)
 184               {
 185                 error (0, 0, "Iteration %zd - garbage after %s (%zd, %d, %zd)",
 186                        n, impl->name, align, c, len);
 187                 ret = 1;
 188                 break;
 189               }
 190         }
 191     }
 192 }
 193 #endif
 194
 195 int
 196 test_main (void)
 197 {
 198   size_t i;
 199   int c = 0;
 200
 201   test_init ();
 202
 203   printf ("%24s", "");
 204   FOR_EACH_IMPL (impl, 0)
 205     printf ("\t%s", impl->name);
 206   putchar ('\n');
 207
 208 #ifndef TEST_BZERO
 209   for (c = -65; c <= 130; c += 65)
 210 #endif
 211     {
 212       for (i = 0; i < 18; ++i)
 213         do_test (0, c, 1 << i);
 214       for (i = 1; i < 32; ++i)
 215         {
 216           do_test (i, c, i);
 217           if (i & (i - 1))
 218             do_test (0, c, i);
 219         }
 220       do_test (1, c, 14);
 221       do_test (3, c, 1024);
 222       do_test (4, c, 64);
 223       do_test (2, c, 25);
 224     }
 225
 226 #ifndef TEST_BZERO
 227   do_random_tests ();
 228 #endif
 229
 230   return ret;
 231 }
 232
 233 #include "../test-skeleton.c"