string/test-memmove.c

   1 /* Test and measure memmove functions.
   2    Copyright (C) 1999-2017 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_BCOPY
  22 # define TEST_NAME "bcopy"
  23 #else
  24 # define TEST_NAME "memmove"
  25 #endif
  26 #include "test-string.h"
  27
  28 char *simple_memmove (char *, const char *, size_t);
  29
  30 #ifdef TEST_BCOPY
  31 typedef void (*proto_t) (const char *, char *, size_t);
  32 void simple_bcopy (const char *, char *, size_t);
  33
  34 IMPL (simple_bcopy, 0)
  35 IMPL (bcopy, 1)
  36
  37 void
  38 simple_bcopy (const char *src, char *dst, size_t n)
  39 {
  40   simple_memmove (dst, src, n);
  41 }
  42 #else
  43 typedef char *(*proto_t) (char *, const char *, size_t);
  44
  45 IMPL (simple_memmove, 0)
  46 IMPL (memmove, 1)
  47 #endif
  48
  49 char *
  50 inhibit_loop_to_libcall
  51 simple_memmove (char *dst, const char *src, size_t n)
  52 {
  53   char *ret = dst;
  54   if (src < dst)
  55     {
  56       dst += n;
  57       src += n;
  58       while (n--)
  59         *--dst = *--src;
  60     }
  61   else
  62     while (n--)
  63       *dst++ = *src++;
  64   return ret;
  65 }
  66
  67 static void
  68 do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
  69              size_t len)
  70 {
  71   /* This also clears the destination buffer set by the previous run.  */
  72   memcpy (src, orig_src, len);
  73 #ifdef TEST_BCOPY
  74   CALL (impl, src, dst, len);
  75 #else
  76   char *res;
  77
  78   res = CALL (impl, dst, src, len);
  79   if (res != dst)
  80     {
  81       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  82              res, dst);
  83       ret = 1;
  84       return;
  85     }
  86 #endif
  87
  88   if (memcmp (dst, orig_src, len) != 0)
  89     {
  90       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  91              impl->name, dst, src);
  92       ret = 1;
  93       return;
  94     }
  95 }
  96
  97 static void
  98 do_test (size_t align1, size_t align2, size_t len)
  99 {
 100   size_t i, j;
 101   char *s1, *s2;
 102
 103   align1 &= 63;
 104   if (align1 + len >= page_size)
 105     return;
 106
 107   align2 &= 63;
 108   if (align2 + len >= page_size)
 109     return;
 110
 111   s1 = (char *) (buf1 + align1);
 112   s2 = (char *) (buf2 + align2);
 113
 114   for (i = 0, j = 1; i < len; i++, j += 23)
 115     s1[i] = j;
 116
 117   FOR_EACH_IMPL (impl, 0)
 118     do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
 119 }
 120
 121 static void
 122 do_random_tests (void)
 123 {
 124   size_t i, n, align1, align2, len, size;
 125   size_t srcstart, srcend, dststart, dstend;
 126   int c;
 127   unsigned char *p1, *p2;
 128 #ifndef TEST_BCOPY
 129   unsigned char *res;
 130 #endif
 131
 132   for (n = 0; n < ITERATIONS; n++)
 133     {
 134       if ((random () & 255) == 0)
 135         size = 65536;
 136       else
 137         size = 512;
 138       if (size > page_size)
 139         size = page_size;
 140       if ((random () & 3) == 0)
 141         {
 142           len = random () & (size - 1);
 143           align1 = size - len - (random () & 31);
 144           align2 = size - len - (random () & 31);
 145           if (align1 > size)
 146             align1 = 0;
 147           if (align2 > size)
 148             align2 = 0;
 149         }
 150       else
 151         {
 152           align1 = random () & (size / 2 - 1);
 153           align2 = random () & (size / 2 - 1);
 154           len = random () & (size - 1);
 155           if (align1 + len > size)
 156             align1 = size - len;
 157           if (align2 + len > size)
 158             align2 = size - len;
 159         }
 160
 161       p1 = buf1 + page_size - size;
 162       p2 = buf2 + page_size - size;
 163       c = random () & 255;
 164       srcend = align1 + len + 256;
 165       if (srcend > size)
 166         srcend = size;
 167       if (align1 > 256)
 168         srcstart = align1 - 256;
 169       else
 170         srcstart = 0;
 171       for (i = srcstart; i < srcend; ++i)
 172         p1[i] = random () & 255;
 173       dstend = align2 + len + 256;
 174       if (dstend > size)
 175         dstend = size;
 176       if (align2 > 256)
 177         dststart = align2 - 256;
 178       else
 179         dststart = 0;
 180
 181       FOR_EACH_IMPL (impl, 1)
 182         {
 183           memset (p2 + dststart, c, dstend - dststart);
 184           memcpy (p2 + srcstart, p1 + srcstart, srcend - srcstart);
 185 #ifdef TEST_BCOPY
 186           CALL (impl, (char *) (p2 + align1), (char *) (p2 + align2), len);
 187 #else
 188           res = (unsigned char *) CALL (impl,
 189                                         (char *) (p2 + align2),
 190                                         (char *) (p2 + align1), len);
 191           if (res != p2 + align2)
 192             {
 193               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 194                      n, impl->name, align1, align2, len, res, p2 + align2);
 195               ret = 1;
 196             }
 197 #endif
 198           if (memcmp (p1 + align1, p2 + align2, len))
 199             {
 200               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 201                      n, impl->name, align1, align2, len);
 202               ret = 1;
 203             }
 204           for (i = dststart; i < dstend; ++i)
 205             {
 206               if (i >= align2 && i < align2 + len)
 207                 {
 208                   i = align2 + len - 1;
 209                   continue;
 210                 }
 211               if (i >= srcstart && i < srcend)
 212                 {
 213                   i = srcend - 1;
 214                   continue;
 215                 }
 216               if (p2[i] != c)
 217                 {
 218                   error (0, 0, "Iteration %zd - garbage in memset area, %s (%zd, %zd, %zd)",
 219                          n, impl->name, align1, align2, len);
 220                   ret = 1;
 221                   break;
 222                 }
 223             }
 224
 225           if (srcstart < align2
 226               && memcmp (p2 + srcstart, p1 + srcstart,
 227                          (srcend > align2 ? align2 : srcend) - srcstart))
 228             {
 229               error (0, 0, "Iteration %zd - garbage before dst, %s (%zd, %zd, %zd)",
 230                      n, impl->name, align1, align2, len);
 231               ret = 1;
 232               break;
 233             }
 234
 235           i = srcstart > align2 + len ? srcstart : align2 + len;
 236           if (srcend > align2 + len
 237               && memcmp (p2 + i, p1 + i, srcend - i))
 238             {
 239               error (0, 0, "Iteration %zd - garbage after dst, %s (%zd, %zd, %zd)",
 240                      n, impl->name, align1, align2, len);
 241               ret = 1;
 242               break;
 243             }
 244         }
 245     }
 246 }
 247
 248 int
 249 test_main (void)
 250 {
 251   size_t i;
 252
 253   test_init ();
 254
 255   printf ("%23s", "");
 256   FOR_EACH_IMPL (impl, 0)
 257     printf ("\t%s", impl->name);
 258   putchar ('\n');
 259
 260   for (i = 0; i < 14; ++i)
 261     {
 262       do_test (0, 32, 1 << i);
 263       do_test (32, 0, 1 << i);
 264       do_test (0, i, 1 << i);
 265       do_test (i, 0, 1 << i);
 266     }
 267
 268   for (i = 0; i < 32; ++i)
 269     {
 270       do_test (0, 32, i);
 271       do_test (32, 0, i);
 272       do_test (0, i, i);
 273       do_test (i, 0, i);
 274     }
 275
 276   for (i = 3; i < 32; ++i)
 277     {
 278       if ((i & (i - 1)) == 0)
 279         continue;
 280       do_test (0, 32, 16 * i);
 281       do_test (32, 0, 16 * i);
 282       do_test (0, i, 16 * i);
 283       do_test (i, 0, 16 * i);
 284     }
 285
 286   do_random_tests ();
 287   return ret;
 288 }
 289
 290 #include <support/test-driver.c>