string/test-strncpy.c

   1 /* Test and measure strncpy 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 #ifndef STRNCPY_RESULT
  21 # define STRNCPY_RESULT(dst, len, n) dst
  22 # define TEST_MAIN
  23 # define TEST_NAME "strncpy"
  24 # include "test-string.h"
  25
  26 char *simple_strncpy (char *, const char *, size_t);
  27 char *stupid_strncpy (char *, const char *, size_t);
  28
  29 IMPL (stupid_strncpy, 0)
  30 IMPL (simple_strncpy, 0)
  31 IMPL (strncpy, 1)
  32
  33 char *
  34 simple_strncpy (char *dst, const char *src, size_t n)
  35 {
  36   char *ret = dst;
  37   while (n--)
  38     if ((*dst++ = *src++) == '\0')
  39       {
  40         while (n--)
  41           *dst++ = '\0';
  42         return ret;
  43       }
  44   return ret;
  45 }
  46
  47 char *
  48 stupid_strncpy (char *dst, const char *src, size_t n)
  49 {
  50   size_t nc = strnlen (src, n);
  51   size_t i;
  52
  53   for (i = 0; i < nc; ++i)
  54     dst[i] = src[i];
  55   for (; i < n; ++i)
  56     dst[i] = '\0';
  57   return dst;
  58 }
  59 #endif
  60
  61 typedef char *(*proto_t) (char *, const char *, size_t);
  62
  63 static void
  64 do_one_test (impl_t *impl, char *dst, const char *src, size_t len, size_t n)
  65 {
  66   if (CALL (impl, dst, src, n) != STRNCPY_RESULT (dst, len, n))
  67     {
  68       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  69              CALL (impl, dst, src, n), dst);
  70       ret = 1;
  71       return;
  72     }
  73
  74   if (memcmp (dst, src, len > n ? n : len) != 0)
  75     {
  76       error (0, 0, "Wrong result in function %s", impl->name);
  77       ret = 1;
  78       return;
  79     }
  80
  81   if (n > len)
  82     {
  83       size_t i;
  84
  85       for (i = len; i < n; ++i)
  86         if (dst [i] != '\0')
  87           {
  88             error (0, 0, "Wrong result in function %s", impl->name);
  89             ret = 1;
  90             return;
  91           }
  92     }
  93 }
  94
  95 static void
  96 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
  97 {
  98   size_t i;
  99   char *s1, *s2;
 100
 101   align1 &= 7;
 102   if (align1 + len >= page_size)
 103     return;
 104
 105   align2 &= 7;
 106   if (align2 + len >= page_size)
 107     return;
 108
 109   s1 = (char *) (buf1 + align1);
 110   s2 = (char *) (buf2 + align2);
 111
 112   for (i = 0; i < len; ++i)
 113     s1[i] = 32 + 23 * i % (max_char - 32);
 114   s1[len] = 0;
 115   for (i = len + 1; i + align1 < page_size && i < len + 64; ++i)
 116     s1[i] = 32 + 32 * i % (max_char - 32);
 117
 118   FOR_EACH_IMPL (impl, 0)
 119     do_one_test (impl, s2, s1, len, n);
 120 }
 121
 122 static void
 123 do_random_tests (void)
 124 {
 125   size_t i, j, n, align1, align2, len, size, mode;
 126   unsigned char *p1 = buf1 + page_size - 512;
 127   unsigned char *p2 = buf2 + page_size - 512;
 128   unsigned char *res;
 129
 130   for (n = 0; n < ITERATIONS; n++)
 131     {
 132       mode = random ();
 133       if (mode & 1)
 134         {
 135           size = random () & 255;
 136           align1 = 512 - size - (random () & 15);
 137           if (mode & 2)
 138             align2 = align1 - (random () & 24);
 139           else
 140             align2 = align1 - (random () & 31);
 141           if (mode & 4)
 142             {
 143               j = align1;
 144               align1 = align2;
 145               align2 = j;
 146             }
 147           if (mode & 8)
 148             len = size - (random () & 31);
 149           else
 150             len = 512;
 151           if (len >= 512)
 152             len = random () & 511;
 153         }
 154       else
 155         {
 156           align1 = random () & 31;
 157           if (mode & 2)
 158             align2 = random () & 31;
 159           else
 160             align2 = align1 + (random () & 24);
 161           len = random () & 511;
 162           j = align1;
 163           if (align2 > j)
 164             j = align2;
 165           if (mode & 4)
 166             {
 167               size = random () & 511;
 168               if (size + j > 512)
 169                 size = 512 - j - (random() & 31);
 170             }
 171           else
 172             size = 512 - j;
 173           if ((mode & 8) && len + j >= 512)
 174             len = 512 - j - (random () & 7);
 175         }
 176       j = len + align1 + 64;
 177       if (j > 512)
 178         j = 512;
 179       for (i = 0; i < j; i++)
 180         {
 181           if (i == len + align1)
 182             p1[i] = 0;
 183           else
 184             {
 185               p1[i] = random () & 255;
 186               if (i >= align1 && i < len + align1 && !p1[i])
 187                 p1[i] = (random () & 127) + 3;
 188             }
 189         }
 190
 191       FOR_EACH_IMPL (impl, 1)
 192         {
 193           memset (p2 - 64, '\1', 512 + 64);
 194           res = (unsigned char *) CALL (impl,
 195                                         (char *) (p2 + align2),
 196                                         (char *) (p1 + align1), size);
 197           if (res != STRNCPY_RESULT (p2 + align2, len, size))
 198             {
 199               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 200                      n, impl->name, align1, align2, len, res,
 201                      STRNCPY_RESULT (p2 + align2, len, size));
 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, %s (%zd, %zd, %zd)",
 209                          n, impl->name, align1, align2, len);
 210                   ret = 1;
 211                   break;
 212                 }
 213             }
 214           j = align2 + len + 1;
 215           if (size + align2 > j)
 216             j = size + align2;
 217           for (; j < 512; ++j)
 218             {
 219               if (p2[j] != '\1')
 220                 {
 221                   error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
 222                          n, impl->name, align1, align2, len);
 223                   ret = 1;
 224                   break;
 225                 }
 226             }
 227           for (j = align2 + len + 1; j < align2 + size; ++j)
 228             if (p2[j])
 229               {
 230                 error (0, 0, "Iteration %zd - garbage after size, %s (%zd, %zd, %zd)",
 231                        n, impl->name, align1, align2, len);
 232                 ret = 1;
 233                 break;
 234               }
 235           j = len + 1;
 236           if (size < j)
 237             j = size;
 238           if (memcmp (p1 + align1, p2 + align2, j))
 239             {
 240               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 241                      n, impl->name, align1, align2, len);
 242               ret = 1;
 243             }
 244         }
 245     }
 246 }
 247
 248 int
 249 test_main (void)
 250 {
 251   size_t i;
 252
 253   test_init ();
 254
 255   printf ("%28s", "");
 256   FOR_EACH_IMPL (impl, 0)
 257     printf ("\t%s", impl->name);
 258   putchar ('\n');
 259
 260   for (i = 1; i < 8; ++i)
 261     {
 262       do_test (i, i, 16, 16, 127);
 263       do_test (i, i, 16, 16, 255);
 264       do_test (i, 2 * i, 16, 16, 127);
 265       do_test (2 * i, i, 16, 16, 255);
 266       do_test (8 - i, 2 * i, 1 << i, 2 << i, 127);
 267       do_test (2 * i, 8 - i, 2 << i, 1 << i, 127);
 268       do_test (8 - i, 2 * i, 1 << i, 2 << i, 255);
 269       do_test (2 * i, 8 - i, 2 << i, 1 << i, 255);
 270     }
 271
 272   for (i = 1; i < 8; ++i)
 273     {
 274       do_test (0, 0, 4 << i, 8 << i, 127);
 275       do_test (0, 0, 16 << i, 8 << i, 127);
 276       do_test (8 - i, 2 * i, 4 << i, 8 << i, 127);
 277       do_test (8 - i, 2 * i, 16 << i, 8 << i, 127);
 278     }
 279
 280   do_random_tests ();
 281   return ret;
 282 }
 283
 284 #include "../test-skeleton.c"