string/test-strstr.c

   1 /* Test and measure strstr functions.
   2    Copyright (C) 2010 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Ulrich Drepper <drepper@redhat.com>, 2010.
   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 #include "test-string.h"
  22
  23
  24 #define STRSTR simple_strstr
  25 #include "strstr.c"
  26
  27
  28 static char *
  29 stupid_strstr (const char *s1, const char *s2)
  30 {
  31   ssize_t s1len = strlen (s1);
  32   ssize_t s2len = strlen (s2);
  33
  34   if (s2len > s1len)
  35     return NULL;
  36
  37   for (ssize_t i = 0; i <= s1len - s2len; ++i)
  38     {
  39       size_t j;
  40       for (j = 0; j < s2len; ++j)
  41         if (s1[i + j] != s2[j])
  42           break;
  43       if (j == s2len)
  44         return (char *) s1 + i;
  45     }
  46
  47   return NULL;
  48 }
  49
  50
  51 typedef char *(*proto_t) (const char *, const char *);
  52
  53 IMPL (stupid_strstr, 0)
  54 IMPL (simple_strstr, 0)
  55 IMPL (strstr, 1)
  56
  57
  58 static int
  59 check_result (impl_t *impl, const char *s1, const char *s2,
  60               char *exp_result)
  61 {
  62   char *result = CALL (impl, s1, s2);
  63   if (result != exp_result)
  64     {
  65       error (0, 0, "Wrong result in function %s %s %s", impl->name,
  66              result, exp_result);
  67       ret = 1;
  68       return -1;
  69     }
  70
  71   return 0;
  72 }
  73
  74 static void
  75 do_one_test (impl_t *impl, const char *s1, const char *s2, char *exp_result)
  76 {
  77   if (check_result (impl, s1, s2, exp_result) < 0)
  78     return;
  79
  80   if (HP_TIMING_AVAIL)
  81     {
  82       hp_timing_t start __attribute ((unused));
  83       hp_timing_t stop __attribute ((unused));
  84       hp_timing_t best_time = ~(hp_timing_t) 0;
  85       size_t i;
  86
  87       for (i = 0; i < 32; ++i)
  88         {
  89           HP_TIMING_NOW (start);
  90           CALL (impl, s1, s2);
  91           HP_TIMING_NOW (stop);
  92           HP_TIMING_BEST (best_time, start, stop);
  93         }
  94
  95       printf ("\t%zd", (size_t) best_time);
  96     }
  97 }
  98
  99
 100 static void
 101 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
 102          int fail)
 103 {
 104   char *s1 = (char *) (buf1 + align1);
 105   char *s2 = (char *) (buf2 + align2);
 106
 107   static const char d[] = "1234567890abcdef";
 108 #define dl (sizeof (d) - 1)
 109   char *ss2 = s2;
 110   for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
 111     {
 112       size_t t = l > dl ? dl : l;
 113       ss2 = mempcpy (ss2, d, t);
 114     }
 115   s2[len2] = '\0';
 116
 117   if (fail)
 118     {
 119       char *ss1 = s1;
 120       for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
 121         {
 122           size_t t = l > dl ? dl : l;
 123           memcpy (ss1, d, t);
 124           ++ss1[len2 > 7 ? 7 : len2 - 1];
 125           ss1 += t;
 126         }
 127     }
 128   else
 129     {
 130       memset (s1, '0', len1);
 131       memcpy (s1 + len1 - len2, s2, len2);
 132     }
 133   s1[len1] = '\0';
 134
 135   if (HP_TIMING_AVAIL)
 136     printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",
 137             len1, len2, align1, align2, fail ? "fail" : "found");
 138
 139   FOR_EACH_IMPL (impl, 0)
 140     do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
 141
 142   if (HP_TIMING_AVAIL)
 143     putchar ('\n');
 144 }
 145
 146 static void
 147 check1 (void)
 148 {
 149   const char s1[] =
 150     "F_BD_CE_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_C3_88_20_EF_BF_BD_EF_BF_BD_EF_BF_BD_C3_A7_20_EF_BF_BD";
 151   const char s2[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
 152   char *exp_result;
 153
 154   exp_result = stupid_strstr (s1, s2);
 155   FOR_EACH_IMPL (impl, 0)
 156     check_result (impl, s1, s2, exp_result);
 157 }
 158
 159 static void
 160 check2 (void)
 161 {
 162   const char s1[] = ", enable_static, \0, enable_shared, ";
 163   char *exp_result;
 164   char *s2 = (void *) buf1 + page_size - 18;
 165
 166   strcpy (s2, s1);
 167   exp_result = stupid_strstr (s1, s1 + 18);
 168   FOR_EACH_IMPL (impl, 0)
 169     {
 170       check_result (impl, s1, s1 + 18, exp_result);
 171       check_result (impl, s2, s1 + 18, exp_result);
 172     }
 173 }
 174
 175 static int
 176 test_main (void)
 177 {
 178   test_init ();
 179
 180   check1 ();
 181   check2 ();
 182
 183   printf ("%23s", "");
 184   FOR_EACH_IMPL (impl, 0)
 185     printf ("\t%s", impl->name);
 186   putchar ('\n');
 187
 188   for (size_t klen = 2; klen < 32; ++klen)
 189     for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
 190       {
 191         do_test (0, 0, hlen, klen, 0);
 192         do_test (0, 0, hlen, klen, 1);
 193         do_test (0, 3, hlen, klen, 0);
 194         do_test (0, 3, hlen, klen, 1);
 195         do_test (0, 9, hlen, klen, 0);
 196         do_test (0, 9, hlen, klen, 1);
 197         do_test (0, 15, hlen, klen, 0);
 198         do_test (0, 15, hlen, klen, 1);
 199
 200         do_test (3, 0, hlen, klen, 0);
 201         do_test (3, 0, hlen, klen, 1);
 202         do_test (3, 3, hlen, klen, 0);
 203         do_test (3, 3, hlen, klen, 1);
 204         do_test (3, 9, hlen, klen, 0);
 205         do_test (3, 9, hlen, klen, 1);
 206         do_test (3, 15, hlen, klen, 0);
 207         do_test (3, 15, hlen, klen, 1);
 208
 209         do_test (9, 0, hlen, klen, 0);
 210         do_test (9, 0, hlen, klen, 1);
 211         do_test (9, 3, hlen, klen, 0);
 212         do_test (9, 3, hlen, klen, 1);
 213         do_test (9, 9, hlen, klen, 0);
 214         do_test (9, 9, hlen, klen, 1);
 215         do_test (9, 15, hlen, klen, 0);
 216         do_test (9, 15, hlen, klen, 1);
 217
 218         do_test (15, 0, hlen, klen, 0);
 219         do_test (15, 0, hlen, klen, 1);
 220         do_test (15, 3, hlen, klen, 0);
 221         do_test (15, 3, hlen, klen, 1);
 222         do_test (15, 9, hlen, klen, 0);
 223         do_test (15, 9, hlen, klen, 1);
 224         do_test (15, 15, hlen, klen, 0);
 225         do_test (15, 15, hlen, klen, 1);
 226       }
 227
 228   do_test (0, 0, page_size - 1, 16, 0);
 229   do_test (0, 0, page_size - 1, 16, 1);
 230
 231   return ret;
 232 }
 233
 234 #include "../test-skeleton.c"