string/test-strstr.c

   1 /* Test and measure strstr functions.
   2    Copyright (C) 2010-2019 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 #define TEST_NAME "strstr"
  22 #include "test-string.h"
  23
  24
  25 #define STRSTR simple_strstr
  26 #define libc_hidden_builtin_def(arg) /* nothing */
  27 #define __strnlen strnlen
  28 #include "strstr.c"
  29
  30
  31 static char *
  32 stupid_strstr (const char *s1, const char *s2)
  33 {
  34   ssize_t s1len = strlen (s1);
  35   ssize_t s2len = strlen (s2);
  36
  37   if (s2len > s1len)
  38     return NULL;
  39
  40   for (ssize_t i = 0; i <= s1len - s2len; ++i)
  41     {
  42       size_t j;
  43       for (j = 0; j < s2len; ++j)
  44         if (s1[i + j] != s2[j])
  45           break;
  46       if (j == s2len)
  47         return (char *) s1 + i;
  48     }
  49
  50   return NULL;
  51 }
  52
  53
  54 typedef char *(*proto_t) (const char *, const char *);
  55
  56 IMPL (stupid_strstr, 0)
  57 IMPL (simple_strstr, 0)
  58 IMPL (strstr, 1)
  59
  60
  61 static int
  62 check_result (impl_t *impl, const char *s1, const char *s2,
  63               char *exp_result)
  64 {
  65   char *result = CALL (impl, s1, s2);
  66   if (result != exp_result)
  67     {
  68       error (0, 0, "Wrong result in function %s %s %s", impl->name,
  69              result, exp_result);
  70       ret = 1;
  71       return -1;
  72     }
  73
  74   return 0;
  75 }
  76
  77 static void
  78 do_one_test (impl_t *impl, const char *s1, const char *s2, char *exp_result)
  79 {
  80   if (check_result (impl, s1, s2, exp_result) < 0)
  81     return;
  82 }
  83
  84
  85 static void
  86 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
  87          int fail)
  88 {
  89   char *s1 = (char *) (buf1 + align1);
  90   char *s2 = (char *) (buf2 + align2);
  91
  92   static const char d[] = "1234567890abcdef";
  93 #define dl (sizeof (d) - 1)
  94   char *ss2 = s2;
  95   for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
  96     {
  97       size_t t = l > dl ? dl : l;
  98       ss2 = mempcpy (ss2, d, t);
  99     }
 100   s2[len2] = '\0';
 101
 102   if (fail)
 103     {
 104       char *ss1 = s1;
 105       for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
 106         {
 107           size_t t = l > dl ? dl : l;
 108           memcpy (ss1, d, t);
 109           ++ss1[len2 > 7 ? 7 : len2 - 1];
 110           ss1 += t;
 111         }
 112     }
 113   else
 114     {
 115       memset (s1, '0', len1);
 116       memcpy (s1 + len1 - len2, s2, len2);
 117     }
 118   s1[len1] = '\0';
 119
 120   FOR_EACH_IMPL (impl, 0)
 121     do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
 122
 123 }
 124
 125 static void
 126 check1 (void)
 127 {
 128   const char s1[] =
 129     "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";
 130   const char s2[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
 131   char *exp_result;
 132
 133   exp_result = stupid_strstr (s1, s2);
 134   FOR_EACH_IMPL (impl, 0)
 135     check_result (impl, s1, s2, exp_result);
 136 }
 137
 138 static void
 139 check2 (void)
 140 {
 141   const char s1[] = ", enable_static, \0, enable_shared, ";
 142   char *exp_result;
 143   char *s2 = (void *) buf1 + page_size - 18;
 144
 145   strcpy (s2, s1);
 146   exp_result = stupid_strstr (s1, s1 + 18);
 147   FOR_EACH_IMPL (impl, 0)
 148     {
 149       check_result (impl, s1, s1 + 18, exp_result);
 150       check_result (impl, s2, s1 + 18, exp_result);
 151     }
 152 }
 153
 154 #define N 1024
 155
 156 static void
 157 pr23637 (void)
 158 {
 159   char *h = (char*) buf1;
 160   char *n = (char*) buf2;
 161
 162   for (int i = 0; i < N; i++)
 163     {
 164       n[i] = 'x';
 165       h[i] = ' ';
 166       h[i + N] = 'x';
 167     }
 168
 169   n[N] = '\0';
 170   h[N * 2] = '\0';
 171
 172   /* Ensure we don't match at the first 'x'.  */
 173   h[0] = 'x';
 174
 175   char *exp_result = stupid_strstr (h, n);
 176   FOR_EACH_IMPL (impl, 0)
 177     check_result (impl, h, n, exp_result);
 178 }
 179
 180 static int
 181 test_main (void)
 182 {
 183   test_init ();
 184
 185   check1 ();
 186   check2 ();
 187   pr23637 ();
 188
 189   printf ("%23s", "");
 190   FOR_EACH_IMPL (impl, 0)
 191     printf ("\t%s", impl->name);
 192   putchar ('\n');
 193
 194   for (size_t klen = 2; klen < 32; ++klen)
 195     for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
 196       {
 197         do_test (0, 0, hlen, klen, 0);
 198         do_test (0, 0, hlen, klen, 1);
 199         do_test (0, 3, hlen, klen, 0);
 200         do_test (0, 3, hlen, klen, 1);
 201         do_test (0, 9, hlen, klen, 0);
 202         do_test (0, 9, hlen, klen, 1);
 203         do_test (0, 15, hlen, klen, 0);
 204         do_test (0, 15, hlen, klen, 1);
 205
 206         do_test (3, 0, hlen, klen, 0);
 207         do_test (3, 0, hlen, klen, 1);
 208         do_test (3, 3, hlen, klen, 0);
 209         do_test (3, 3, hlen, klen, 1);
 210         do_test (3, 9, hlen, klen, 0);
 211         do_test (3, 9, hlen, klen, 1);
 212         do_test (3, 15, hlen, klen, 0);
 213         do_test (3, 15, hlen, klen, 1);
 214
 215         do_test (9, 0, hlen, klen, 0);
 216         do_test (9, 0, hlen, klen, 1);
 217         do_test (9, 3, hlen, klen, 0);
 218         do_test (9, 3, hlen, klen, 1);
 219         do_test (9, 9, hlen, klen, 0);
 220         do_test (9, 9, hlen, klen, 1);
 221         do_test (9, 15, hlen, klen, 0);
 222         do_test (9, 15, hlen, klen, 1);
 223
 224         do_test (15, 0, hlen, klen, 0);
 225         do_test (15, 0, hlen, klen, 1);
 226         do_test (15, 3, hlen, klen, 0);
 227         do_test (15, 3, hlen, klen, 1);
 228         do_test (15, 9, hlen, klen, 0);
 229         do_test (15, 9, hlen, klen, 1);
 230         do_test (15, 15, hlen, klen, 0);
 231         do_test (15, 15, hlen, klen, 1);
 232
 233         do_test (15, 15, hlen + klen * 4, klen * 4, 0);
 234         do_test (15, 15, hlen + klen * 4, klen * 4, 1);
 235       }
 236
 237   do_test (0, 0, page_size - 1, 16, 0);
 238   do_test (0, 0, page_size - 1, 16, 1);
 239
 240   return ret;
 241 }
 242
 243 #include <support/test-driver.c>