string/test-memccpy.c

   1 /* Test and measure memccpy functions.
   2    Copyright (C) 1999-2018 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
  79 static void
  80 do_test (size_t align1, size_t align2, int c, size_t len, size_t n,
  81          int max_char)
  82 {
  83   size_t i;
  84   char *s1, *s2;
  85
  86   align1 &= 7;
  87   if (align1 + len >= page_size)
  88     return;
  89
  90   align2 &= 7;
  91   if (align2 + len >= page_size)
  92     return;
  93
  94   s1 = (char *) (buf1 + align1);
  95   s2 = (char *) (buf2 + align2);
  96
  97   for (i = 0; i < len - 1; ++i)
  98     {
  99       s1[i] = 32 + 23 * i % (max_char - 32);
 100       if (s1[i] == (char) c)
 101         --s1[i];
 102     }
 103   s1[len - 1] = c;
 104   for (i = len; i + align1 < page_size && i < len + 64; ++i)
 105     s1[i] = 32 + 32 * i % (max_char - 32);
 106
 107   FOR_EACH_IMPL (impl, 0)
 108     do_one_test (impl, s2, s1, c, len, n);
 109 }
 110
 111 static void
 112 do_random_tests (void)
 113 {
 114   size_t i, j, n, align1, align2, len, size, mode;
 115   unsigned char *p1 = buf1 + page_size - 512;
 116   unsigned char *p2 = buf2 + page_size - 512;
 117   unsigned char *res, c;
 118
 119   for (n = 0; n < ITERATIONS; n++)
 120     {
 121       mode = random ();
 122       c = random ();
 123       if (mode & 1)
 124         {
 125           size = random () & 255;
 126           align1 = 512 - size - (random () & 15);
 127           if (mode & 2)
 128             align2 = align1 - (random () & 24);
 129           else
 130             align2 = align1 - (random () & 31);
 131           if (mode & 4)
 132             {
 133               j = align1;
 134               align1 = align2;
 135               align2 = j;
 136             }
 137           if (mode & 8)
 138             len = size - (random () & 31);
 139           else
 140             len = 512;
 141           if (len >= 512)
 142             len = random () & 511;
 143         }
 144       else
 145         {
 146           align1 = random () & 31;
 147           if (mode & 2)
 148             align2 = random () & 31;
 149           else
 150             align2 = align1 + (random () & 24);
 151           len = random () & 511;
 152           j = align1;
 153           if (align2 > j)
 154             j = align2;
 155           if (mode & 4)
 156             {
 157               size = random () & 511;
 158               if (size + j > 512)
 159                 size = 512 - j - (random() & 31);
 160             }
 161           else
 162             size = 512 - j;
 163           if ((mode & 8) && len + j >= 512)
 164             len = 512 - j - (random () & 7);
 165         }
 166       j = len + align1 + 64;
 167       if (j > 512)
 168         j = 512;
 169       for (i = 0; i < j; i++)
 170         {
 171           if (i == len + align1)
 172             p1[i] = c;
 173           else
 174             {
 175               p1[i] = random () & 255;
 176               if (i >= align1 && i < len + align1 && p1[i] == c)
 177                 p1[i] = (random () & 127) + 3 + c;
 178             }
 179         }
 180
 181       FOR_EACH_IMPL (impl, 1)
 182         {
 183           unsigned char *expect;
 184           memset (p2 - 64, '\1', 512 + 64);
 185           res = CALL (impl, p2 + align2, p1 + align1, (char) c, size);
 186           if (len >= size)
 187             expect = NULL;
 188           else
 189             expect = p2 + align2 + len + 1;
 190
 191           if (res != expect)
 192             {
 193               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %d) %p != %p",
 194                      n, impl->name, align1, align2, len, size, c, res, expect);
 195               ret = 1;
 196             }
 197           for (j = 0; j < align2 + 64; ++j)
 198             {
 199               if (p2[j - 64] != '\1')
 200                 {
 201                   error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
 202                          n, impl->name, align1, align2, len);
 203                   ret = 1;
 204                   break;
 205                 }
 206             }
 207           j = align2 + len + 1;
 208           if (size + align2 < j)
 209             j = size + align2;
 210           for (; j < 512; ++j)
 211             {
 212               if (p2[j] != '\1')
 213                 {
 214                   error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
 215                          n, impl->name, align1, align2, len);
 216                   ret = 1;
 217                   break;
 218                 }
 219             }
 220           j = len + 1;
 221           if (size < j)
 222             j = size;
 223           if (memcmp (p1 + align1, p2 + align2, j))
 224             {
 225               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 226                      n, impl->name, align1, align2, len);
 227               ret = 1;
 228             }
 229         }
 230     }
 231 }
 232
 233 int
 234 test_main (void)
 235 {
 236   size_t i;
 237
 238   test_init ();
 239
 240   printf ("%28s", "");
 241   FOR_EACH_IMPL (impl, 0)
 242     printf ("\t%s", impl->name);
 243   putchar ('\n');
 244
 245   for (i = 1; i < 8; ++i)
 246     {
 247       do_test (i, i, 12, 16, 16, 127);
 248       do_test (i, i, 23, 16, 16, 255);
 249       do_test (i, 2 * i, 28, 16, 16, 127);
 250       do_test (2 * i, i, 31, 16, 16, 255);
 251       do_test (8 - i, 2 * i, 1, 1 << i, 2 << i, 127);
 252       do_test (2 * i, 8 - i, 17, 2 << i, 1 << i, 127);
 253       do_test (8 - i, 2 * i, 0, 1 << i, 2 << i, 255);
 254       do_test (2 * i, 8 - i, i, 2 << i, 1 << i, 255);
 255     }
 256
 257   for (i = 1; i < 8; ++i)
 258     {
 259       do_test (0, 0, i, 4 << i, 8 << i, 127);
 260       do_test (0, 0, i, 16 << i, 8 << i, 127);
 261       do_test (8 - i, 2 * i, i, 4 << i, 8 << i, 127);
 262       do_test (8 - i, 2 * i, i, 16 << i, 8 << i, 127);
 263     }
 264
 265   do_random_tests ();
 266   return ret;
 267 }
 268
 269 #include <support/test-driver.c>