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 void
  59 do_one_test (impl_t *impl, const char *s1, const char *s2, char *exp_result)
  60 {
  61   char *result = CALL (impl, s1, s2);
  62   if (result != exp_result)
  63     {
  64       error (0, 0, "Wrong result in function %s %s %s", impl->name,
  65              result, exp_result);
  66       ret = 1;
  67       return;
  68     }
  69
  70   if (HP_TIMING_AVAIL)
  71     {
  72       hp_timing_t start __attribute ((unused));
  73       hp_timing_t stop __attribute ((unused));
  74       hp_timing_t best_time = ~(hp_timing_t) 0;
  75       size_t i;
  76
  77       for (i = 0; i < 32; ++i)
  78         {
  79           HP_TIMING_NOW (start);
  80           CALL (impl, s1, s2);
  81           HP_TIMING_NOW (stop);
  82           HP_TIMING_BEST (best_time, start, stop);
  83         }
  84
  85       printf ("\t%zd", (size_t) best_time);
  86     }
  87 }
  88
  89
  90 static void
  91 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
  92          int fail)
  93 {
  94   char *s1 = (char *) (buf1 + align1);
  95   char *s2 = (char *) (buf2 + align2);
  96
  97   static const char d[] = "1234567890abcdef";
  98 #define dl (sizeof (d) - 1)
  99   char *ss2 = s2;
 100   for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
 101     {
 102       size_t t = l > dl ? dl : l;
 103       ss2 = mempcpy (ss2, d, t);
 104     }
 105   s2[len2] = '\0';
 106
 107   if (fail)
 108     {
 109       char *ss1 = s1;
 110       for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
 111         {
 112           size_t t = l > dl ? dl : l;
 113           memcpy (ss1, d, t);
 114           ++ss1[len2 > 7 ? 7 : len2 - 1];
 115           ss1 += t;
 116         }
 117     }
 118   else
 119     {
 120       memset (s1, '0', len1);
 121       memcpy (s1 + len1 - len2, s2, len2);
 122     }
 123   s1[len1] = '\0';
 124
 125   if (HP_TIMING_AVAIL)
 126     printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",
 127             len1, len2, align1, align2, fail ? "fail" : "found");
 128
 129   FOR_EACH_IMPL (impl, 0)
 130     do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
 131
 132   if (HP_TIMING_AVAIL)
 133     putchar ('\n');
 134 }
 135
 136
 137 static int
 138 test_main (void)
 139 {
 140   test_init ();
 141
 142   printf ("%23s", "");
 143   FOR_EACH_IMPL (impl, 0)
 144     printf ("\t%s", impl->name);
 145   putchar ('\n');
 146
 147   for (size_t klen = 2; klen < 32; ++klen)
 148     for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
 149       {
 150         do_test (0, 0, hlen, klen, 0);
 151         do_test (0, 0, hlen, klen, 1);
 152         do_test (0, 3, hlen, klen, 0);
 153         do_test (0, 3, hlen, klen, 1);
 154         do_test (0, 9, hlen, klen, 0);
 155         do_test (0, 9, hlen, klen, 1);
 156         do_test (0, 15, hlen, klen, 0);
 157         do_test (0, 15, hlen, klen, 1);
 158
 159         do_test (3, 0, hlen, klen, 0);
 160         do_test (3, 0, hlen, klen, 1);
 161         do_test (3, 3, hlen, klen, 0);
 162         do_test (3, 3, hlen, klen, 1);
 163         do_test (3, 9, hlen, klen, 0);
 164         do_test (3, 9, hlen, klen, 1);
 165         do_test (3, 15, hlen, klen, 0);
 166         do_test (3, 15, hlen, klen, 1);
 167
 168         do_test (9, 0, hlen, klen, 0);
 169         do_test (9, 0, hlen, klen, 1);
 170         do_test (9, 3, hlen, klen, 0);
 171         do_test (9, 3, hlen, klen, 1);
 172         do_test (9, 9, hlen, klen, 0);
 173         do_test (9, 9, hlen, klen, 1);
 174         do_test (9, 15, hlen, klen, 0);
 175         do_test (9, 15, hlen, klen, 1);
 176
 177         do_test (15, 0, hlen, klen, 0);
 178         do_test (15, 0, hlen, klen, 1);
 179         do_test (15, 3, hlen, klen, 0);
 180         do_test (15, 3, hlen, klen, 1);
 181         do_test (15, 9, hlen, klen, 0);
 182         do_test (15, 9, hlen, klen, 1);
 183         do_test (15, 15, hlen, klen, 0);
 184         do_test (15, 15, hlen, klen, 1);
 185       }
 186
 187   do_test (0, 0, page_size - 1, 16, 0);
 188   do_test (0, 0, page_size - 1, 16, 1);
 189
 190   return ret;
 191 }
 192
 193 #include "../test-skeleton.c"