string/test-memccpy.c

   1 /* Test and measure memccpy functions.
   2    Copyright (C) 1999-2013 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 #define TEST_NAME "memccpy"
  22 #include "test-string.h"
  23
  24 void *simple_memccpy (void *, const void *, int, size_t);
  25 void *stupid_memccpy (void *, const void *, int, size_t);
  26
  27 IMPL (stupid_memccpy, 0)
  28 IMPL (simple_memccpy, 0)
  29 IMPL (memccpy, 1)
  30
  31 void *
  32 simple_memccpy (void *dst, const void *src, int c, size_t n)
  33 {
  34   const char *s = src;
  35   char *d = dst;
  36
  37   while (n-- > 0)
  38     if ((*d++ = *s++) == (char) c)
  39       return d;
  40
  41   return NULL;
  42 }
  43
  44 void *
  45 stupid_memccpy (void *dst, const void *src, int c, size_t n)
  46 {
  47   void *p = memchr (src, c, n);
  48
  49   if (p != NULL)
  50     return mempcpy (dst, src, p - src + 1);
  51
  52   memcpy (dst, src, n);
  53   return NULL;
  54 }
  55
  56 typedef void *(*proto_t) (void *, const void *, int c, size_t);
  57
  58 static void
  59 do_one_test (impl_t *impl, void *dst, const void *src, int c, size_t len,
  60              size_t n)
  61 {
  62   void *expect = len > n ? NULL : (char *) dst + len;
  63   if (CALL (impl, dst, src, c, n) != expect)
  64     {
  65       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  66              CALL (impl, dst, src, c, n), expect);
  67       ret = 1;
  68       return;
  69     }
  70
  71   if (memcmp (dst, src, len > n ? n : len) != 0)
  72     {
  73       error (0, 0, "Wrong result in function %s", impl->name);
  74       ret = 1;
  75       return;
  76     }
  77
  78   if (HP_TIMING_AVAIL)
  79     {
  80       hp_timing_t start __attribute__ ((unused));
  81       hp_timing_t stop __attribute__ ((unused));
  82       hp_timing_t best_time = ~ (hp_timing_t) 0;
  83       size_t i;
  84
  85       for (i = 0; i < 32; ++i)
  86         {
  87           HP_TIMING_NOW (start);
  88           CALL (impl, dst, src, c, n);
  89           HP_TIMING_NOW (stop);
  90           HP_TIMING_BEST (best_time, start, stop);
  91         }
  92
  93       printf ("\t%zd", (size_t) best_time);
  94     }
  95 }
  96
  97 static void
  98 do_test (size_t align1, size_t align2, int c, size_t len, size_t n,
  99          int max_char)
 100 {
 101   size_t i;
 102   char *s1, *s2;
 103
 104   align1 &= 7;
 105   if (align1 + len >= page_size)
 106     return;
 107
 108   align2 &= 7;
 109   if (align2 + len >= page_size)
 110     return;
 111
 112   s1 = (char *) (buf1 + align1);
 113   s2 = (char *) (buf2 + align2);
 114
 115   for (i = 0; i < len - 1; ++i)
 116     {
 117       s1[i] = 32 + 23 * i % (max_char - 32);
 118       if (s1[i] == (char) c)
 119         --s1[i];
 120     }
 121   s1[len - 1] = c;
 122   for (i = len; i + align1 < page_size && i < len + 64; ++i)
 123     s1[i] = 32 + 32 * i % (max_char - 32);
 124
 125   if (HP_TIMING_AVAIL)
 126     printf ("Length %4zd, n %4zd, char %d, alignment %2zd/%2zd:", len, n, c, align1, align2);
 127
 128   FOR_EACH_IMPL (impl, 0)
 129     do_one_test (impl, s2, s1, c, len, n);
 130
 131   if (HP_TIMING_AVAIL)
 132     putchar ('\n');
 133 }
 134
 135 static void
 136 do_random_tests (void)
 137 {
 138   size_t i, j, n, align1, align2, len, size, mode;
 139   unsigned char *p1 = buf1 + page_size - 512;
 140   unsigned char *p2 = buf2 + page_size - 512;
 141   unsigned char *res, c;
 142
 143   for (n = 0; n < ITERATIONS; n++)
 144     {
 145       mode = random ();
 146       c = random ();
 147       if (mode & 1)
 148         {
 149           size = random () & 255;
 150           align1 = 512 - size - (random () & 15);
 151           if (mode & 2)
 152             align2 = align1 - (random () & 24);
 153           else
 154             align2 = align1 - (random () & 31);
 155           if (mode & 4)
 156             {
 157               j = align1;
 158               align1 = align2;
 159               align2 = j;
 160             }
 161           if (mode & 8)
 162             len = size - (random () & 31);
 163           else
 164             len = 512;
 165           if (len >= 512)
 166             len = random () & 511;
 167         }
 168       else
 169         {
 170           align1 = random () & 31;
 171           if (mode & 2)
 172             align2 = random () & 31;
 173           else
 174             align2 = align1 + (random () & 24);
 175           len = random () & 511;
 176           j = align1;
 177           if (align2 > j)
 178             j = align2;
 179           if (mode & 4)
 180             {
 181               size = random () & 511;
 182               if (size + j > 512)
 183                 size = 512 - j - (random() & 31);
 184             }
 185           else
 186             size = 512 - j;
 187           if ((mode & 8) && len + j >= 512)
 188             len = 512 - j - (random () & 7);
 189         }
 190       j = len + align1 + 64;
 191       if (j > 512)
 192         j = 512;
 193       for (i = 0; i < j; i++)
 194         {
 195           if (i == len + align1)
 196             p1[i] = c;
 197           else
 198             {
 199               p1[i] = random () & 255;
 200               if (i >= align1 && i < len + align1 && p1[i] == c)
 201                 p1[i] = (random () & 127) + 3 + c;
 202             }
 203         }
 204
 205       FOR_EACH_IMPL (impl, 1)
 206         {
 207           unsigned char *expect;
 208           memset (p2 - 64, '\1', 512 + 64);
 209           res = CALL (impl, p2 + align2, p1 + align1, (char) c, size);
 210           if (len >= size)
 211             expect = NULL;
 212           else
 213             expect = p2 + align2 + len + 1;
 214
 215           if (res != expect)
 216             {
 217               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %d) %p != %p",
 218                      n, impl->name, align1, align2, len, size, c, res, expect);
 219               ret = 1;
 220             }
 221           for (j = 0; j < align2 + 64; ++j)
 222             {
 223               if (p2[j - 64] != '\1')
 224                 {
 225                   error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
 226                          n, impl->name, align1, align2, len);
 227                   ret = 1;
 228                   break;
 229                 }
 230             }
 231           j = align2 + len + 1;
 232           if (size + align2 < j)
 233             j = size + align2;
 234           for (; j < 512; ++j)
 235             {
 236               if (p2[j] != '\1')
 237                 {
 238                   error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
 239                          n, impl->name, align1, align2, len);
 240                   ret = 1;
 241                   break;
 242                 }
 243             }
 244           j = len + 1;
 245           if (size < j)
 246             j = size;
 247           if (memcmp (p1 + align1, p2 + align2, j))
 248             {
 249               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 250                      n, impl->name, align1, align2, len);
 251               ret = 1;
 252             }
 253         }
 254     }
 255 }
 256
 257 int
 258 test_main (void)
 259 {
 260   size_t i;
 261
 262   test_init ();
 263
 264   printf ("%28s", "");
 265   FOR_EACH_IMPL (impl, 0)
 266     printf ("\t%s", impl->name);
 267   putchar ('\n');
 268
 269   for (i = 1; i < 8; ++i)
 270     {
 271       do_test (i, i, 12, 16, 16, 127);
 272       do_test (i, i, 23, 16, 16, 255);
 273       do_test (i, 2 * i, 28, 16, 16, 127);
 274       do_test (2 * i, i, 31, 16, 16, 255);
 275       do_test (8 - i, 2 * i, 1, 1 << i, 2 << i, 127);
 276       do_test (2 * i, 8 - i, 17, 2 << i, 1 << i, 127);
 277       do_test (8 - i, 2 * i, 0, 1 << i, 2 << i, 255);
 278       do_test (2 * i, 8 - i, i, 2 << i, 1 << i, 255);
 279     }
 280
 281   for (i = 1; i < 8; ++i)
 282     {
 283       do_test (0, 0, i, 4 << i, 8 << i, 127);
 284       do_test (0, 0, i, 16 << i, 8 << i, 127);
 285       do_test (8 - i, 2 * i, i, 4 << i, 8 << i, 127);
 286       do_test (8 - i, 2 * i, i, 16 << i, 8 << i, 127);
 287     }
 288
 289   do_random_tests ();
 290   return ret;
 291 }
 292
 293 #include "../test-skeleton.c"