string/test-strncat.c

   1 /* Test and measure strncat functions.
   2    Copyright (C) 2011-2013 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 }
  71
  72 static void
  73 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
  74          size_t n, int max_char)
  75 {
  76   size_t i;
  77   char *s1, *s2;
  78
  79   align1 &= 7;
  80   if (align1 + len1 >= page_size)
  81     return;
  82   if (align1 + n > page_size)
  83     return;
  84   align2 &= 7;
  85   if (align2 + len1 + len2 >= page_size)
  86     return;
  87   if (align2 + len1 + n > page_size)
  88     return;
  89   s1 = (char *) (buf1 + align1);
  90   s2 = (char *) (buf2 + align2);
  91
  92   for (i = 0; i < len1; ++i)
  93     s1[i] = 32 + 23 * i % (max_char - 32);
  94   s1[len1] = '\0';
  95
  96   for (i = 0; i < len2; i++)
  97     s2[i] = 32 + 23 * i % (max_char - 32);
  98
  99   FOR_EACH_IMPL (impl, 0)
 100     {
 101       s2[len2] = '\0';
 102       do_one_test (impl, s2, s1, n);
 103     }
 104 }
 105
 106 static void
 107 do_random_tests (void)
 108 {
 109   size_t i, j, n, align1, align2, len1, len2, N;
 110   unsigned char *p1 = buf1 + page_size - 512;
 111   unsigned char *p2 = buf2 + page_size - 512;
 112   unsigned char *res;
 113   fprintf (stdout, "Number of iterations in random test = %zd\n",
 114            ITERATIONS);
 115   for (n = 0; n < ITERATIONS; n++)
 116     {
 117       N = random () & 255;
 118       align1 = random () & 31;
 119       if (random () & 1)
 120         align2 = random () & 31;
 121       else
 122         align2 = align1 + (random () & 24);
 123       len1 = random () & 511;
 124       if (len1 + align2 > 512)
 125         len2 = random () & 7;
 126       else
 127         len2 = (512 - len1 - align2) * (random () & (1024 * 1024 - 1))
 128           / (1024 * 1024);
 129       j = align1;
 130       if (align2 + len2 > j)
 131         j = align2 + len2;
 132       if (len1 + j >= 511)
 133         len1 = 510 - j - (random () & 7);
 134       if (len1 >= 512)
 135         len1 = 0;
 136       if (align1 + len1 < 512 - 8)
 137         {
 138           j = 510 - align1 - len1 - (random () & 31);
 139           if (j > 0 && j < 512)
 140             align1 += j;
 141         }
 142       j = len1 + align1 + 64;
 143       if (j > 512)
 144         j = 512;
 145       for (i = 0; i < j; i++)
 146         {
 147           if (i == len1 + align1)
 148             p1[i] = 0;
 149           else
 150             {
 151               p1[i] = random () & 255;
 152               if (i >= align1 && i < len1 + align1 && !p1[i])
 153                 p1[i] = (random () & 127) + 3;
 154             }
 155         }
 156       for (i = 0; i < len2; i++)
 157         {
 158           buf1[i] = random () & 255;
 159           if (!buf1[i])
 160             buf1[i] = (random () & 127) + 3;
 161         }
 162       buf1[len2] = 0;
 163
 164       FOR_EACH_IMPL (impl, 1)
 165         {
 166           memset (p2 - 64, '\1', align2 + 64);
 167           memset (p2 + align2 + len2 + 1, '\1', 512 - align2 - len2 - 1);
 168           memcpy (p2 + align2, buf1, len2 + 1);
 169           res = (unsigned char *) CALL (impl, (char *) (p2 + align2),
 170                                         (char *) (p1 + align1), N);
 171           if (res != p2 + align2)
 172             {
 173               error (0, 0, "Iteration %zd - wrong result in function %s "
 174                      "(%zd, %zd, %zd, %zd, %zd) %p != %p",
 175                      n, impl->name, align1, align2, len1, len2, N,
 176                      res, p2 + align2);
 177               ret = 1;
 178             }
 179           for (j = 0; j < align2 + 64; ++j)
 180             {
 181               if (p2[j - 64] != '\1')
 182                 {
 183                   error (0, 0, "Iteration %zd - garbage before dst, %s "
 184                          "%zd, %zd, %zd, %zd, %zd)",
 185                          n, impl->name, align1, align2, len1, len2, N);
 186                   ret = 1;
 187                   break;
 188                 }
 189             }
 190           if (memcmp (p2 + align2, buf1, len2))
 191             {
 192               error (0, 0, "Iteration %zd - garbage in string before, %s "
 193                      "(%zd, %zd, %zd, %zd, %zd)",
 194                      n, impl->name, align1, align2, len1, len2, N);
 195               ret = 1;
 196             }
 197
 198           if ((len1 + 1) > N)
 199             j = align2 + N + 1 + len2;
 200           else
 201             j = align2 + len1 + 1 + len2;
 202           for (; j < 512; ++j)
 203             {
 204               if (p2[j] != '\1')
 205                 {
 206                   error (0, 0, "Iteration %zd - garbage after, %s "
 207                          "(%zd, %zd, %zd, %zd, %zd)",
 208                          n, impl->name, align1, align2, len1, len2, N);
 209                   ret = 1;
 210                   break;
 211                 }
 212             }
 213           if (len1 + 1 > N)
 214             {
 215               if (p2[align2 + N + len2] != '\0')
 216                 {
 217                   error (0, 0, "Iteration %zd - there is no zero at the "
 218                          "end of output string, %s (%zd, %zd, %zd, %zd, %zd)",
 219                          n, impl->name, align1, align2, len1, len2, N);
 220                   ret = 1;
 221                 }
 222             }
 223           if (memcmp (p1 + align1, p2 + align2 + len2,
 224                       (len1 + 1) > N ? N : len1 + 1))
 225             {
 226               error (0, 0, "Iteration %zd - different strings, %s "
 227                      "(%zd, %zd, %zd, %zd, %zd)",
 228                      n, impl->name, align1, align2, len1, len2, N);
 229               ret = 1;
 230             }
 231         }
 232     }
 233 }
 234
 235 int
 236 main (void)
 237 {
 238   size_t i, n;
 239
 240   test_init ();
 241
 242   printf ("%28s", "");
 243   FOR_EACH_IMPL (impl, 0)
 244     printf ("\t%s", impl->name);
 245   putchar ('\n');
 246
 247   for (n = 2; n <= 2048; n*=4)
 248     {
 249       do_test (0, 2, 2, 2, n, 127);
 250       do_test (0, 0, 4, 4, n, 127);
 251       do_test (4, 0, 4, 4, n, 255);
 252       do_test (0, 0, 8, 8, n, 127);
 253       do_test (0, 8, 8, 8, n, 127);
 254
 255       for (i = 1; i < 8; ++i)
 256         {
 257           do_test (0, 0, 8 << i, 8 << i, n, 127);
 258           do_test (8 - i, 2 * i, 8 << i, 8 << i, n, 127);
 259           do_test (0, 0, 8 << i, 2 << i, n, 127);
 260           do_test (8 - i, 2 * i, 8 << i, 2 << i, n, 127);
 261         }
 262
 263       for (i = 1; i < 8; ++i)
 264         {
 265           do_test (i, 2 * i, 8 << i, 1, n, 127);
 266           do_test (2 * i, i, 8 << i, 1, n, 255);
 267           do_test (i, i, 8 << i, 10, n, 127);
 268         }
 269     }
 270
 271   do_random_tests ();
 272   return ret;
 273 }