string/test-strncpy.c

   1 /* Test and measure strncpy functions.
   2    Copyright (C) 1999, 2002, 2003 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef STRNCPY_RESULT
  22 # define STRNCPY_RESULT(dst, len, n) dst
  23 # define TEST_MAIN
  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   if (HP_TIMING_AVAIL)
  95     {
  96       hp_timing_t start __attribute__ ((unused));
  97       hp_timing_t stop __attribute__ ((unused));
  98       hp_timing_t best_time = ~ (hp_timing_t) 0;
  99       size_t i;
 100
 101       for (i = 0; i < 32; ++i)
 102         {
 103           HP_TIMING_NOW (start);
 104           CALL (impl, dst, src, n);
 105           HP_TIMING_NOW (stop);
 106           HP_TIMING_BEST (best_time, start, stop);
 107         }
 108
 109       printf ("\t%zd", (size_t) best_time);
 110     }
 111 }
 112
 113 static void
 114 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
 115 {
 116   size_t i;
 117   char *s1, *s2;
 118
 119   align1 &= 7;
 120   if (align1 + len >= page_size)
 121     return;
 122
 123   align2 &= 7;
 124   if (align2 + len >= page_size)
 125     return;
 126
 127   s1 = buf1 + align1;
 128   s2 = buf2 + align2;
 129
 130   for (i = 0; i < len; ++i)
 131     s1[i] = 32 + 23 * i % (max_char - 32);
 132   s1[len] = 0;
 133   for (i = len + 1; i + align1 < page_size && i < len + 64; ++i)
 134     s1[i] = 32 + 32 * i % (max_char - 32);
 135
 136   if (HP_TIMING_AVAIL)
 137     printf ("Length %4zd, n %4zd, alignment %2zd/%2zd:", len, n, align1, align2);
 138
 139   FOR_EACH_IMPL (impl, 0)
 140     do_one_test (impl, s2, s1, len, n);
 141
 142   if (HP_TIMING_AVAIL)
 143     putchar ('\n');
 144 }
 145
 146 static void
 147 do_random_tests (void)
 148 {
 149   size_t i, j, n, align1, align2, len, size, mode;
 150   unsigned char *p1 = buf1 + page_size - 512;
 151   unsigned char *p2 = buf2 + page_size - 512;
 152   unsigned char *res;
 153
 154   for (n = 0; n < ITERATIONS; n++)
 155     {
 156       mode = random ();
 157       if (mode & 1)
 158         {
 159           size = random () & 255;
 160           align1 = 512 - size - (random () & 15);
 161           if (mode & 2)
 162             align2 = align1 - (random () & 24);
 163           else
 164             align2 = align1 - (random () & 31);
 165           if (mode & 4)
 166             {
 167               j = align1;
 168               align1 = align2;
 169               align2 = j;
 170             }
 171           if (mode & 8)
 172             len = size - (random () & 31);
 173           else
 174             len = 512;
 175           if (len >= 512)
 176             len = random () & 511;
 177         }
 178       else
 179         {
 180           align1 = random () & 31;
 181           if (mode & 2)
 182             align2 = random () & 31;
 183           else
 184             align2 = align1 + (random () & 24);
 185           len = random () & 511;
 186           j = align1;
 187           if (align2 > j)
 188             j = align2;
 189           if (mode & 4)
 190             {
 191               size = random () & 511;
 192               if (size + j > 512)
 193                 size = 512 - j - (random() & 31);
 194             }
 195           else
 196             size = 512 - j;
 197           if ((mode & 8) && len + j >= 512)
 198             len = 512 - j - (random () & 7);
 199         }
 200       j = len + align1 + 64;
 201       if (j > 512)
 202         j = 512;
 203       for (i = 0; i < j; i++)
 204         {
 205           if (i == len + align1)
 206             p1[i] = 0;
 207           else
 208             {
 209               p1[i] = random () & 255;
 210               if (i >= align1 && i < len + align1 && !p1[i])
 211                 p1[i] = (random () & 127) + 3;
 212             }
 213         }
 214
 215       FOR_EACH_IMPL (impl, 1)
 216         {
 217           memset (p2 - 64, '\1', 512 + 64);
 218           res = CALL (impl, p2 + align2, p1 + align1, size);
 219           if (res != STRNCPY_RESULT (p2 + align2, len, size))
 220             {
 221               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 222                      n, impl->name, align1, align2, len, res,
 223                      STRNCPY_RESULT (p2 + align2, len, size));
 224               ret = 1;
 225             }
 226           for (j = 0; j < align2 + 64; ++j)
 227             {
 228               if (p2[j - 64] != '\1')
 229                 {
 230                   error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
 231                          n, impl->name, align1, align2, len);
 232                   ret = 1;
 233                   break;
 234                 }
 235             }
 236           j = align2 + len + 1;
 237           if (size + align2 > j)
 238             j = size + align2;
 239           for (; j < 512; ++j)
 240             {
 241               if (p2[j] != '\1')
 242                 {
 243                   error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
 244                          n, impl->name, align1, align2, len);
 245                   ret = 1;
 246                   break;
 247                 }
 248             }
 249           for (j = align2 + len + 1; j < align2 + size; ++j)
 250             if (p2[j])
 251               {
 252                 error (0, 0, "Iteration %zd - garbage after size, %s (%zd, %zd, %zd)",
 253                        n, impl->name, align1, align2, len);
 254                 ret = 1;
 255                 break;
 256               }
 257           j = len + 1;
 258           if (size < j)
 259             j = size;
 260           if (memcmp (p1 + align1, p2 + align2, j))
 261             {
 262               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 263                      n, impl->name, align1, align2, len);
 264               ret = 1;
 265             }
 266         }
 267     }
 268 }
 269
 270 int
 271 test_main (void)
 272 {
 273   size_t i;
 274
 275   test_init ();
 276
 277   printf ("%28s", "");
 278   FOR_EACH_IMPL (impl, 0)
 279     printf ("\t%s", impl->name);
 280   putchar ('\n');
 281
 282   for (i = 1; i < 8; ++i)
 283     {
 284       do_test (i, i, 16, 16, 127);
 285       do_test (i, i, 16, 16, 255);
 286       do_test (i, 2 * i, 16, 16, 127);
 287       do_test (2 * i, i, 16, 16, 255);
 288       do_test (8 - i, 2 * i, 1 << i, 2 << i, 127);
 289       do_test (2 * i, 8 - i, 2 << i, 1 << i, 127);
 290       do_test (8 - i, 2 * i, 1 << i, 2 << i, 255);
 291       do_test (2 * i, 8 - i, 2 << i, 1 << i, 255);
 292     }
 293
 294   for (i = 1; i < 8; ++i)
 295     {
 296       do_test (0, 0, 4 << i, 8 << i, 127);
 297       do_test (0, 0, 16 << i, 8 << i, 127);
 298       do_test (8 - i, 2 * i, 4 << i, 8 << i, 127);
 299       do_test (8 - i, 2 * i, 16 << i, 8 << i, 127);
 300     }
 301
 302   do_random_tests ();
 303   return ret;
 304 }
 305
 306 #include "../test-skeleton.c"