string/test-strncmp.c

   1 /* Test and measure strncmp functions.
   2    Copyright (C) 1999, 2002 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 #define TEST_MAIN
  22 #include "test-string.h"
  23
  24 typedef int (*proto_t) (const char *, const char *, size_t);
  25 int simple_strncmp (const char *, const char *, size_t);
  26 int stupid_strncmp (const char *, const char *, size_t);
  27
  28 IMPL (stupid_strncmp, 0)
  29 IMPL (simple_strncmp, 0)
  30 IMPL (strncmp, 1)
  31
  32 int
  33 simple_strncmp (const char *s1, const char *s2, size_t n)
  34 {
  35   int ret = 0;
  36
  37   while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
  38          && *s1++);
  39   return ret;
  40 }
  41
  42 int
  43 stupid_strncmp (const char *s1, const char *s2, size_t n)
  44 {
  45   size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
  46   int ret = 0;
  47
  48   n = ns1 < n ? ns1 : n;
  49   n = ns2 < n ? ns2 : n;
  50   while (n-- && (ret = *(unsigned char *) s1++ - * (unsigned char *) s2++) == 0);
  51   return ret;
  52 }
  53
  54 static void
  55 do_one_test (impl_t *impl, const char *s1, const char *s2, size_t n,
  56              int exp_result)
  57 {
  58   int result = CALL (impl, s1, s2, n);
  59   if ((exp_result == 0 && result != 0)
  60       || (exp_result < 0 && result >= 0)
  61       || (exp_result > 0 && result <= 0))
  62     {
  63       error (0, 0, "Wrong result in function %s %d %d", impl->name,
  64              result, exp_result);
  65       ret = 1;
  66       return;
  67     }
  68
  69   if (HP_TIMING_AVAIL)
  70     {
  71       hp_timing_t start, stop, best_time = ~ (hp_timing_t) 0;
  72       size_t i;
  73
  74       for (i = 0; i < 32; ++i)
  75         {
  76           HP_TIMING_NOW (start);
  77           CALL (impl, s1, s2, n);
  78           HP_TIMING_NOW (stop);
  79           HP_TIMING_BEST (best_time, start, stop);
  80         }
  81
  82       printf ("\t%zd", (size_t) best_time);
  83     }
  84 }
  85
  86 static void
  87 do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
  88          int exp_result)
  89 {
  90   size_t i;
  91   char *s1, *s2;
  92
  93   if (n == 0)
  94     return;
  95
  96   align1 &= 7;
  97   if (align1 + n + 1 >= page_size)
  98     return;
  99
 100   align2 &= 7;
 101   if (align2 + n + 1 >= page_size)
 102     return;
 103
 104   s1 = buf1 + align1;
 105   s2 = buf2 + align2;
 106
 107   for (i = 0; i < n; i++)
 108     s1[i] = s2[i] = 1 + 23 * i % max_char;
 109
 110   s1[n] = 24 + exp_result;
 111   s2[n] = 23;
 112   s1[len] = 0;
 113   s2[len] = 0;
 114   if (exp_result < 0)
 115     s2[len] = 32;
 116   else if (exp_result > 0)
 117     s1[len] = 64;
 118   if (len >= n)
 119     s2[n - 1] -= exp_result;
 120
 121   if (HP_TIMING_AVAIL)
 122     printf ("Length %4zd/%4zd, alignment %2zd/%2zd:", len, n, align1, align2);
 123
 124   FOR_EACH_IMPL (impl, 0)
 125     do_one_test (impl, s1, s2, n, exp_result);
 126
 127   if (HP_TIMING_AVAIL)
 128     putchar ('\n');
 129 }
 130
 131 static void
 132 do_random_tests (void)
 133 {
 134   size_t i, j, n, align1, align2, pos, len1, len2, size;
 135   int result, r;
 136   unsigned char *p1 = buf1 + page_size - 512;
 137   unsigned char *p2 = buf2 + page_size - 512;
 138
 139   for (n = 0; n < ITERATIONS; n++)
 140     {
 141       align1 = random () & 31;
 142       if (random () & 1)
 143         align2 = random () & 31;
 144       else
 145         align2 = align1 + (random () & 24);
 146       pos = random () & 511;
 147       size = random () & 511;
 148       j = align1 > align2 ? align1 : align2;
 149       if (pos + j >= 511)
 150         pos = 510 - j - (random () & 7);
 151       len1 = random () & 511;
 152       if (pos >= len1 && (random () & 1))
 153         len1 = pos + (random () & 7);
 154       if (len1 + j >= 512)
 155         len1 = 511 - j - (random () & 7);
 156       if (pos >= len1)
 157         len2 = len1;
 158       else
 159         len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
 160       j = (pos > len2 ? pos : len2) + align1 + 64;
 161       if (j > 512)
 162         j = 512;
 163       for (i = 0; i < j; ++i)
 164         {
 165           p1[i] = random () & 255;
 166           if (i < len1 + align1 && !p1[i])
 167             {
 168               p1[i] = random () & 255;
 169               if (!p1[i])
 170                 p1[i] = 1 + (random () & 127);
 171             }
 172         }
 173       for (i = 0; i < j; ++i)
 174         {
 175           p2[i] = random () & 255;
 176           if (i < len2 + align2 && !p2[i])
 177             {
 178               p2[i] = random () & 255;
 179               if (!p2[i])
 180                 p2[i] = 1 + (random () & 127);
 181             }
 182         }
 183
 184       result = 0;
 185       memcpy (p2 + align2, p1 + align1, pos);
 186       if (pos < len1)
 187         {
 188           if (p2[align2 + pos] == p1[align1 + pos])
 189             {
 190               p2[align2 + pos] = random () & 255;
 191               if (p2[align2 + pos] == p1[align1 + pos])
 192                 p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
 193             }
 194
 195           if (pos < size)
 196             {
 197               if (p1[align1 + pos] < p2[align2 + pos])
 198                 result = -1;
 199               else
 200                 result = 1;
 201             }
 202         }
 203       p1[len1 + align1] = 0;
 204       p2[len2 + align2] = 0;
 205
 206       FOR_EACH_IMPL (impl, 1)
 207         {
 208           r = CALL (impl, p1 + align1, p2 + align2, size);
 209           if ((r == 0 && result)
 210               || (r < 0 && result >= 0)
 211               || (r > 0 && result <= 0))
 212             {
 213               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd, %zd) %d != %d, p1 %p p2 %p",
 214                      n, impl->name, align1, align2, len1, len2, pos, size, r, result, p1, p2);
 215               ret = 1;
 216             }
 217         }
 218     }
 219 }
 220
 221 int
 222 test_main (void)
 223 {
 224   size_t i;
 225
 226   test_init ();
 227
 228   printf ("%23s", "");
 229   FOR_EACH_IMPL (impl, 0)
 230     printf ("\t%s", impl->name);
 231   putchar ('\n');
 232
 233   for (i =0; i < 16; ++i)
 234     {
 235       do_test (0, 0, 8, i, 127, 0);
 236       do_test (0, 0, 8, i, 127, -1);
 237       do_test (0, 0, 8, i, 127, 1);
 238       do_test (i, i, 8, i, 127, 0);
 239       do_test (i, i, 8, i, 127, 1);
 240       do_test (i, i, 8, i, 127, -1);
 241       do_test (i, 2 * i, 8, i, 127, 0);
 242       do_test (2 * i, i, 8, i, 127, 1);
 243       do_test (i, 3 * i, 8, i, 127, -1);
 244       do_test (0, 0, 8, i, 255, 0);
 245       do_test (0, 0, 8, i, 255, -1);
 246       do_test (0, 0, 8, i, 255, 1);
 247       do_test (i, i, 8, i, 255, 0);
 248       do_test (i, i, 8, i, 255, 1);
 249       do_test (i, i, 8, i, 255, -1);
 250       do_test (i, 2 * i, 8, i, 255, 0);
 251       do_test (2 * i, i, 8, i, 255, 1);
 252       do_test (i, 3 * i, 8, i, 255, -1);
 253     }
 254
 255   for (i = 1; i < 8; ++i)
 256     {
 257       do_test (0, 0, 8 << i, 16 << i, 127, 0);
 258       do_test (0, 0, 8 << i, 16 << i, 127, 1);
 259       do_test (0, 0, 8 << i, 16 << i, 127, -1);
 260       do_test (0, 0, 8 << i, 16 << i, 255, 0);
 261       do_test (0, 0, 8 << i, 16 << i, 255, 1);
 262       do_test (0, 0, 8 << i, 16 << i, 255, -1);
 263       do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
 264       do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
 265       do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
 266       do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
 267     }
 268
 269   do_random_tests ();
 270   return ret;
 271 }
 272
 273 #include "../test-skeleton.c"