string/test-strstr.c

   1 /* Test and measure strstr functions.
   2    Copyright (C) 2010-2020 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    <https://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 == NULL) ? "(null)" : result,
  70              (exp_result == NULL) ? "(null)" : exp_result);
  71       ret = 1;
  72       return -1;
  73     }
  74
  75   return 0;
  76 }
  77
  78 static void
  79 do_one_test (impl_t *impl, const char *s1, const char *s2, char *exp_result)
  80 {
  81   if (check_result (impl, s1, s2, exp_result) < 0)
  82     return;
  83 }
  84
  85
  86 static void
  87 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
  88          int fail)
  89 {
  90   char *s1 = (char *) (buf1 + align1);
  91   char *s2 = (char *) (buf2 + align2);
  92
  93   static const char d[] = "1234567890abcdef";
  94 #define dl (sizeof (d) - 1)
  95   char *ss2 = s2;
  96   for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
  97     {
  98       size_t t = l > dl ? dl : l;
  99       ss2 = mempcpy (ss2, d, t);
 100     }
 101   s2[len2] = '\0';
 102
 103   if (fail)
 104     {
 105       char *ss1 = s1;
 106       for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
 107         {
 108           size_t t = l > dl ? dl : l;
 109           memcpy (ss1, d, t);
 110           ++ss1[len2 > 7 ? 7 : len2 - 1];
 111           ss1 += t;
 112         }
 113     }
 114   else
 115     {
 116       memset (s1, '0', len1);
 117       memcpy (s1 + len1 - len2, s2, len2);
 118     }
 119   s1[len1] = '\0';
 120
 121   FOR_EACH_IMPL (impl, 0)
 122     do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
 123
 124 }
 125
 126 static void
 127 check1 (void)
 128 {
 129   const char s1[] =
 130     "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";
 131   const char s2[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
 132   char *exp_result;
 133
 134   exp_result = stupid_strstr (s1, s2);
 135   FOR_EACH_IMPL (impl, 0)
 136     check_result (impl, s1, s2, exp_result);
 137 }
 138
 139 static void
 140 check2 (void)
 141 {
 142   const char s1_stack[] = ", enable_static, \0, enable_shared, ";
 143   const size_t s1_byte_count = 18;
 144   const char *s2_stack = &(s1_stack[s1_byte_count]);
 145   const size_t s2_byte_count = 18;
 146   char *exp_result;
 147   const size_t page_size_real = getpagesize ();
 148
 149   /* Haystack at end of page.  The following page is protected.  */
 150   char *s1_page_end = (void *) buf1 + page_size - s1_byte_count;
 151   strcpy (s1_page_end, s1_stack);
 152
 153   /* Haystack which crosses a page boundary.
 154      Note: page_size is at least 2 * getpagesize.  See test_init.  */
 155   char *s1_page_cross = (void *) buf1 + page_size_real - 8;
 156   strcpy (s1_page_cross, s1_stack);
 157
 158   /* Needle at end of page.  The following page is protected.  */
 159   char *s2_page_end = (void *) buf2 + page_size - s2_byte_count;
 160   strcpy (s2_page_end, s2_stack);
 161
 162   /* Needle which crosses a page boundary.
 163      Note: page_size is at least 2 * getpagesize.  See test_init.  */
 164   char *s2_page_cross = (void *) buf2 + page_size_real - 8;
 165   strcpy (s2_page_cross, s2_stack);
 166
 167   exp_result = stupid_strstr (s1_stack, s2_stack);
 168   FOR_EACH_IMPL (impl, 0)
 169     {
 170       check_result (impl, s1_stack, s2_stack, exp_result);
 171       check_result (impl, s1_stack, s2_page_end, exp_result);
 172       check_result (impl, s1_stack, s2_page_cross, exp_result);
 173
 174       check_result (impl, s1_page_end, s2_stack, exp_result);
 175       check_result (impl, s1_page_end, s2_page_end, exp_result);
 176       check_result (impl, s1_page_end, s2_page_cross, exp_result);
 177
 178       check_result (impl, s1_page_cross, s2_stack, exp_result);
 179       check_result (impl, s1_page_cross, s2_page_end, exp_result);
 180       check_result (impl, s1_page_cross, s2_page_cross, exp_result);
 181     }
 182 }
 183
 184 #define N 1024
 185
 186 static void
 187 pr23637 (void)
 188 {
 189   char *h = (char*) buf1;
 190   char *n = (char*) buf2;
 191
 192   for (int i = 0; i < N; i++)
 193     {
 194       n[i] = 'x';
 195       h[i] = ' ';
 196       h[i + N] = 'x';
 197     }
 198
 199   n[N] = '\0';
 200   h[N * 2] = '\0';
 201
 202   /* Ensure we don't match at the first 'x'.  */
 203   h[0] = 'x';
 204
 205   char *exp_result = stupid_strstr (h, n);
 206   FOR_EACH_IMPL (impl, 0)
 207     check_result (impl, h, n, exp_result);
 208 }
 209
 210 static int
 211 test_main (void)
 212 {
 213   test_init ();
 214
 215   check1 ();
 216   check2 ();
 217   pr23637 ();
 218
 219   printf ("%23s", "");
 220   FOR_EACH_IMPL (impl, 0)
 221     printf ("\t%s", impl->name);
 222   putchar ('\n');
 223
 224   for (size_t klen = 2; klen < 32; ++klen)
 225     for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
 226       {
 227         do_test (0, 0, hlen, klen, 0);
 228         do_test (0, 0, hlen, klen, 1);
 229         do_test (0, 3, hlen, klen, 0);
 230         do_test (0, 3, hlen, klen, 1);
 231         do_test (0, 9, hlen, klen, 0);
 232         do_test (0, 9, hlen, klen, 1);
 233         do_test (0, 15, hlen, klen, 0);
 234         do_test (0, 15, hlen, klen, 1);
 235
 236         do_test (3, 0, hlen, klen, 0);
 237         do_test (3, 0, hlen, klen, 1);
 238         do_test (3, 3, hlen, klen, 0);
 239         do_test (3, 3, hlen, klen, 1);
 240         do_test (3, 9, hlen, klen, 0);
 241         do_test (3, 9, hlen, klen, 1);
 242         do_test (3, 15, hlen, klen, 0);
 243         do_test (3, 15, hlen, klen, 1);
 244
 245         do_test (9, 0, hlen, klen, 0);
 246         do_test (9, 0, hlen, klen, 1);
 247         do_test (9, 3, hlen, klen, 0);
 248         do_test (9, 3, hlen, klen, 1);
 249         do_test (9, 9, hlen, klen, 0);
 250         do_test (9, 9, hlen, klen, 1);
 251         do_test (9, 15, hlen, klen, 0);
 252         do_test (9, 15, hlen, klen, 1);
 253
 254         do_test (15, 0, hlen, klen, 0);
 255         do_test (15, 0, hlen, klen, 1);
 256         do_test (15, 3, hlen, klen, 0);
 257         do_test (15, 3, hlen, klen, 1);
 258         do_test (15, 9, hlen, klen, 0);
 259         do_test (15, 9, hlen, klen, 1);
 260         do_test (15, 15, hlen, klen, 0);
 261         do_test (15, 15, hlen, klen, 1);
 262
 263         do_test (15, 15, hlen + klen * 4, klen * 4, 0);
 264         do_test (15, 15, hlen + klen * 4, klen * 4, 1);
 265       }
 266
 267   do_test (0, 0, page_size - 1, 16, 0);
 268   do_test (0, 0, page_size - 1, 16, 1);
 269
 270   return ret;
 271 }
 272
 273 #include <support/test-driver.c>