string/test-strncat.c

   1 /* Test and measure strncat functions.
   2    Copyright (C) 2011-2012 Free Software Foundation, Inc.
   3    Contributed by Intel Corporation.
   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    <http://www.gnu.org/licenses/>.  */
  18
  19 #define TEST_MAIN
  20 #define TEST_NAME "strncat"
  21 #include "test-string.h"
  22
  23 typedef char *(*proto_t) (char *, const char *, size_t);
  24 char *stupid_strncat (char *, const char *, size_t);
  25 char *simple_strncat (char *, const char *, size_t);
  26
  27 IMPL (stupid_strncat, 0)
  28 IMPL (strncat, 2)
  29
  30 char *
  31 stupid_strncat (char *dst, const char *src, size_t n)
  32 {
  33   char *ret = dst;
  34   while (*dst++ != '\0');
  35   --dst;
  36   while (n--)
  37     if ( (*dst++ = *src++) == '\0')
  38       return ret;
  39   *dst = '\0';
  40   return ret;
  41 }
  42
  43 static void
  44 do_one_test (impl_t *impl, char *dst, const char *src, size_t n)
  45 {
  46   size_t k = strlen (dst);
  47   if (CALL (impl, dst, src, n) != dst)
  48     {
  49       error (0, 0, "Wrong result in function %s %p != %p", impl->name,
  50              CALL (impl, dst, src, n), dst);
  51       ret = 1;
  52       return;
  53     }
  54
  55   size_t len = strlen (src);
  56   if (memcmp (dst + k, src, len + 1 > n ? n : len + 1) != 0)
  57     {
  58       error (0, 0, "Incorrect cancatination in function %s",
  59              impl->name);
  60       ret = 1;
  61       return;
  62     }
  63   if (n < len && dst[k + n] != '\0')
  64     {
  65       error (0, 0, "There is no zero in the end of output string in %s",
  66              impl->name);
  67       ret = 1;
  68       return;
  69     }
  70   if (HP_TIMING_AVAIL)
  71     {
  72       hp_timing_t start __attribute ((unused));
  73       hp_timing_t stop __attribute ((unused));
  74       hp_timing_t best_time = ~ (hp_timing_t) 0;
  75       size_t i;
  76
  77       for (i = 0; i < 32; ++i)
  78         {
  79           dst[k] = '\0';
  80           HP_TIMING_NOW (start);
  81           CALL (impl, dst, src, n);
  82           HP_TIMING_NOW (stop);
  83           HP_TIMING_BEST (best_time, start, stop);
  84         }
  85
  86       printf ("\t%zd", (size_t) best_time);
  87     }
  88 }
  89
  90 static void
  91 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
  92          size_t n, int max_char)
  93 {
  94   size_t i;
  95   char *s1, *s2;
  96
  97   align1 &= 7;
  98   if (align1 + len1 >= page_size)
  99     return;
 100   if (align1 + n > page_size)
 101     return;
 102   align2 &= 7;
 103   if (align2 + len1 + len2 >= page_size)
 104     return;
 105   if (align2 + len1 + n > page_size)
 106     return;
 107   s1 = (char *) (buf1 + align1);
 108   s2 = (char *) (buf2 + align2);
 109
 110   for (i = 0; i < len1; ++i)
 111     s1[i] = 32 + 23 * i % (max_char - 32);
 112   s1[len1] = '\0';
 113
 114   for (i = 0; i < len2; i++)
 115     s2[i] = 32 + 23 * i % (max_char - 32);
 116
 117   if (HP_TIMING_AVAIL)
 118     printf ("Length %4zd/%4zd, alignment %2zd/%2zd, N %4zd:",
 119             len1, len2, align1, align2, n);
 120
 121   FOR_EACH_IMPL (impl, 0)
 122     {
 123       s2[len2] = '\0';
 124       do_one_test (impl, s2, s1, n);
 125     }
 126
 127   if (HP_TIMING_AVAIL)
 128     putchar ('\n');
 129 }
 130
 131 static void
 132 do_random_tests (void)
 133 {
 134   size_t i, j, n, align1, align2, len1, len2, N;
 135   unsigned char *p1 = buf1 + page_size - 512;
 136   unsigned char *p2 = buf2 + page_size - 512;
 137   unsigned char *res;
 138   fprintf (stdout, "Number of iterations in random test = %zd\n",
 139            ITERATIONS);
 140   for (n = 0; n < ITERATIONS; n++)
 141     {
 142       N = random () & 255;
 143       align1 = random () & 31;
 144       if (random () & 1)
 145         align2 = random () & 31;
 146       else
 147         align2 = align1 + (random () & 24);
 148       len1 = random () & 511;
 149       if (len1 + align2 > 512)
 150         len2 = random () & 7;
 151       else
 152         len2 = (512 - len1 - align2) * (random () & (1024 * 1024 - 1))
 153           / (1024 * 1024);
 154       j = align1;
 155       if (align2 + len2 > j)
 156         j = align2 + len2;
 157       if (len1 + j >= 511)
 158         len1 = 510 - j - (random () & 7);
 159       if (len1 >= 512)
 160         len1 = 0;
 161       if (align1 + len1 < 512 - 8)
 162         {
 163           j = 510 - align1 - len1 - (random () & 31);
 164           if (j > 0 && j < 512)
 165             align1 += j;
 166         }
 167       j = len1 + align1 + 64;
 168       if (j > 512)
 169         j = 512;
 170       for (i = 0; i < j; i++)
 171         {
 172           if (i == len1 + align1)
 173             p1[i] = 0;
 174           else
 175             {
 176               p1[i] = random () & 255;
 177               if (i >= align1 && i < len1 + align1 && !p1[i])
 178                 p1[i] = (random () & 127) + 3;
 179             }
 180         }
 181       for (i = 0; i < len2; i++)
 182         {
 183           buf1[i] = random () & 255;
 184           if (!buf1[i])
 185             buf1[i] = (random () & 127) + 3;
 186         }
 187       buf1[len2] = 0;
 188
 189       FOR_EACH_IMPL (impl, 1)
 190         {
 191           memset (p2 - 64, '\1', align2 + 64);
 192           memset (p2 + align2 + len2 + 1, '\1', 512 - align2 - len2 - 1);
 193           memcpy (p2 + align2, buf1, len2 + 1);
 194           res = (unsigned char *) CALL (impl, (char *) (p2 + align2),
 195                                         (char *) (p1 + align1), N);
 196           if (res != p2 + align2)
 197             {
 198               error (0, 0, "Iteration %zd - wrong result in function %s "
 199                      "(%zd, %zd, %zd, %zd, %zd) %p != %p",
 200                      n, impl->name, align1, align2, len1, len2, N,
 201                      res, p2 + align2);
 202               ret = 1;
 203             }
 204           for (j = 0; j < align2 + 64; ++j)
 205             {
 206               if (p2[j - 64] != '\1')
 207                 {
 208                   error (0, 0, "Iteration %zd - garbage before dst, %s "
 209                          "%zd, %zd, %zd, %zd, %zd)",
 210                          n, impl->name, align1, align2, len1, len2, N);
 211                   ret = 1;
 212                   break;
 213                 }
 214             }
 215           if (memcmp (p2 + align2, buf1, len2))
 216             {
 217               error (0, 0, "Iteration %zd - garbage in string before, %s "
 218                      "(%zd, %zd, %zd, %zd, %zd)",
 219                      n, impl->name, align1, align2, len1, len2, N);
 220               ret = 1;
 221             }
 222
 223           if ((len1 + 1) > N)
 224             j = align2 + N + 1 + len2;
 225           else
 226             j = align2 + len1 + 1 + len2;
 227           for (; j < 512; ++j)
 228             {
 229               if (p2[j] != '\1')
 230                 {
 231                   error (0, 0, "Iteration %zd - garbage after, %s "
 232                          "(%zd, %zd, %zd, %zd, %zd)",
 233                          n, impl->name, align1, align2, len1, len2, N);
 234                   ret = 1;
 235                   break;
 236                 }
 237             }
 238           if (len1 + 1 > N)
 239             {
 240               if (p2[align2 + N + len2] != '\0')
 241                 {
 242                   error (0, 0, "Iteration %zd - there is no zero at the "
 243                          "end of output string, %s (%zd, %zd, %zd, %zd, %zd)",
 244                          n, impl->name, align1, align2, len1, len2, N);
 245                   ret = 1;
 246                 }
 247             }
 248           if (memcmp (p1 + align1, p2 + align2 + len2,
 249                       (len1 + 1) > N ? N : len1 + 1))
 250             {
 251               error (0, 0, "Iteration %zd - different strings, %s "
 252                      "(%zd, %zd, %zd, %zd, %zd)",
 253                      n, impl->name, align1, align2, len1, len2, N);
 254               ret = 1;
 255             }
 256         }
 257     }
 258 }
 259
 260 int
 261 main (void)
 262 {
 263   size_t i, n;
 264
 265   test_init ();
 266
 267   printf ("%28s", "");
 268   FOR_EACH_IMPL (impl, 0)
 269     printf ("\t%s", impl->name);
 270   putchar ('\n');
 271
 272   for (n = 2; n <= 2048; n*=4)
 273     {
 274       do_test (0, 2, 2, 2, n, 127);
 275       do_test (0, 0, 4, 4, n, 127);
 276       do_test (4, 0, 4, 4, n, 255);
 277       do_test (0, 0, 8, 8, n, 127);
 278       do_test (0, 8, 8, 8, n, 127);
 279
 280       for (i = 1; i < 8; ++i)
 281         {
 282           do_test (0, 0, 8 << i, 8 << i, n, 127);
 283           do_test (8 - i, 2 * i, 8 << i, 8 << i, n, 127);
 284           do_test (0, 0, 8 << i, 2 << i, n, 127);
 285           do_test (8 - i, 2 * i, 8 << i, 2 << i, n, 127);
 286         }
 287
 288       for (i = 1; i < 8; ++i)
 289         {
 290           do_test (i, 2 * i, 8 << i, 1, n, 127);
 291           do_test (2 * i, i, 8 << i, 1, n, 255);
 292           do_test (i, i, 8 << i, 10, n, 127);
 293         }
 294     }
 295
 296   do_random_tests ();
 297   return ret;
 298 }