string/test-strstr.c

   1 /* Test and measure strstr functions.
   2    Copyright (C) 2010-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #define TEST_MAIN
  20 #define TEST_NAME "strstr"
  21 #include "test-string.h"
  22
  23
  24 #define STRSTR c_strstr
  25 #define libc_hidden_builtin_def(arg) /* nothing */
  26 #define __strnlen strnlen
  27 #include "strstr.c"
  28
  29 /* Naive implementation to verify results.  */
  30 static char *
  31 simple_strstr (const char *s1, const char *s2)
  32 {
  33   ssize_t s1len = strlen (s1);
  34   ssize_t s2len = strlen (s2);
  35
  36   if (s2len > s1len)
  37     return NULL;
  38
  39   for (ssize_t i = 0; i <= s1len - s2len; ++i)
  40     {
  41       size_t j;
  42       for (j = 0; j < s2len; ++j)
  43         if (s1[i + j] != s2[j])
  44           break;
  45       if (j == s2len)
  46         return (char *) s1 + i;
  47     }
  48
  49   return NULL;
  50 }
  51
  52
  53 typedef char *(*proto_t) (const char *, const char *);
  54
  55 IMPL (c_strstr, 0)
  56 IMPL (strstr, 1)
  57
  58
  59 static int
  60 check_result (impl_t *impl, const char *s1, const char *s2,
  61               char *exp_result)
  62 {
  63   char *result = CALL (impl, s1, s2);
  64   if (result != exp_result)
  65     {
  66       error (0, 0, "Wrong result in function %s %s %s", impl->name,
  67              (result == NULL) ? "(null)" : result,
  68              (exp_result == NULL) ? "(null)" : exp_result);
  69       ret = 1;
  70       return -1;
  71     }
  72
  73   return 0;
  74 }
  75
  76 static void
  77 do_one_test (impl_t *impl, const char *s1, const char *s2, char *exp_result)
  78 {
  79   if (check_result (impl, s1, s2, exp_result) < 0)
  80     return;
  81 }
  82
  83
  84 static void
  85 do_test (size_t align1, size_t align2, size_t len1, size_t len2,
  86          int fail)
  87 {
  88   char *s1 = (char *) (buf1 + align1);
  89   char *s2 = (char *) (buf2 + align2);
  90
  91   static const char d[] = "1234567890abcdef";
  92 #define dl (sizeof (d) - 1)
  93   char *ss2 = s2;
  94   for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
  95     {
  96       size_t t = l > dl ? dl : l;
  97       ss2 = mempcpy (ss2, d, t);
  98     }
  99   s2[len2] = '\0';
 100
 101   if (fail)
 102     {
 103       char *ss1 = s1;
 104       for (size_t l = len1; l > 0; l = l > dl ? l - dl : 0)
 105         {
 106           size_t t = l > dl ? dl : l;
 107           memcpy (ss1, d, t);
 108           ++ss1[len2 > 7 ? 7 : len2 - 1];
 109           ss1 += t;
 110         }
 111     }
 112   else
 113     {
 114       memset (s1, '0', len1);
 115       memcpy (s1 + len1 - len2, s2, len2);
 116     }
 117   s1[len1] = '\0';
 118
 119   FOR_EACH_IMPL (impl, 0)
 120     do_one_test (impl, s1, s2, fail ? NULL : s1 + len1 - len2);
 121
 122 }
 123
 124 static void
 125 check1 (void)
 126 {
 127   const char s1[] =
 128     "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";
 129   const char s2[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
 130   char *exp_result;
 131
 132   exp_result = simple_strstr (s1, s2);
 133   FOR_EACH_IMPL (impl, 0)
 134     check_result (impl, s1, s2, exp_result);
 135 }
 136
 137 static void
 138 check2 (void)
 139 {
 140   const char s1_stack[] = ", enable_static, \0, enable_shared, ";
 141   const size_t s1_byte_count = 18;
 142   const char *s2_stack = &(s1_stack[s1_byte_count]);
 143   const size_t s2_byte_count = 18;
 144   char *exp_result;
 145   const size_t page_size_real = getpagesize ();
 146
 147   /* Haystack at end of page.  The following page is protected.  */
 148   char *s1_page_end = (void *) buf1 + page_size - s1_byte_count;
 149   strcpy (s1_page_end, s1_stack);
 150
 151   /* Haystack which crosses a page boundary.
 152      Note: page_size is at least 2 * getpagesize.  See test_init.  */
 153   char *s1_page_cross = (void *) buf1 + page_size_real - 8;
 154   strcpy (s1_page_cross, s1_stack);
 155
 156   /* Needle at end of page.  The following page is protected.  */
 157   char *s2_page_end = (void *) buf2 + page_size - s2_byte_count;
 158   strcpy (s2_page_end, s2_stack);
 159
 160   /* Needle which crosses a page boundary.
 161      Note: page_size is at least 2 * getpagesize.  See test_init.  */
 162   char *s2_page_cross = (void *) buf2 + page_size_real - 8;
 163   strcpy (s2_page_cross, s2_stack);
 164
 165   exp_result = simple_strstr (s1_stack, s2_stack);
 166   FOR_EACH_IMPL (impl, 0)
 167     {
 168       check_result (impl, s1_stack, s2_stack, exp_result);
 169       check_result (impl, s1_stack, s2_page_end, exp_result);
 170       check_result (impl, s1_stack, s2_page_cross, exp_result);
 171
 172       check_result (impl, s1_page_end, s2_stack, exp_result);
 173       check_result (impl, s1_page_end, s2_page_end, exp_result);
 174       check_result (impl, s1_page_end, s2_page_cross, exp_result);
 175
 176       check_result (impl, s1_page_cross, s2_stack, exp_result);
 177       check_result (impl, s1_page_cross, s2_page_end, exp_result);
 178       check_result (impl, s1_page_cross, s2_page_cross, exp_result);
 179     }
 180 }
 181
 182 #define N 1024
 183
 184 static void
 185 pr23637 (void)
 186 {
 187   char *h = (char*) buf1;
 188   char *n = (char*) buf2;
 189
 190   for (int i = 0; i < N; i++)
 191     {
 192       n[i] = 'x';
 193       h[i] = ' ';
 194       h[i + N] = 'x';
 195     }
 196
 197   n[N] = '\0';
 198   h[N * 2] = '\0';
 199
 200   /* Ensure we don't match at the first 'x'.  */
 201   h[0] = 'x';
 202
 203   char *exp_result = simple_strstr (h, n);
 204   FOR_EACH_IMPL (impl, 0)
 205     check_result (impl, h, n, exp_result);
 206 }
 207
 208 static int
 209 test_main (void)
 210 {
 211   test_init ();
 212
 213   check1 ();
 214   check2 ();
 215   pr23637 ();
 216
 217   printf ("%23s", "");
 218   FOR_EACH_IMPL (impl, 0)
 219     printf ("\t%s", impl->name);
 220   putchar ('\n');
 221
 222   for (size_t klen = 2; klen < 32; ++klen)
 223     for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
 224       {
 225         do_test (0, 0, hlen, klen, 0);
 226         do_test (0, 0, hlen, klen, 1);
 227         do_test (0, 3, hlen, klen, 0);
 228         do_test (0, 3, hlen, klen, 1);
 229         do_test (0, 9, hlen, klen, 0);
 230         do_test (0, 9, hlen, klen, 1);
 231         do_test (0, 15, hlen, klen, 0);
 232         do_test (0, 15, hlen, klen, 1);
 233
 234         do_test (3, 0, hlen, klen, 0);
 235         do_test (3, 0, hlen, klen, 1);
 236         do_test (3, 3, hlen, klen, 0);
 237         do_test (3, 3, hlen, klen, 1);
 238         do_test (3, 9, hlen, klen, 0);
 239         do_test (3, 9, hlen, klen, 1);
 240         do_test (3, 15, hlen, klen, 0);
 241         do_test (3, 15, hlen, klen, 1);
 242
 243         do_test (9, 0, hlen, klen, 0);
 244         do_test (9, 0, hlen, klen, 1);
 245         do_test (9, 3, hlen, klen, 0);
 246         do_test (9, 3, hlen, klen, 1);
 247         do_test (9, 9, hlen, klen, 0);
 248         do_test (9, 9, hlen, klen, 1);
 249         do_test (9, 15, hlen, klen, 0);
 250         do_test (9, 15, hlen, klen, 1);
 251
 252         do_test (15, 0, hlen, klen, 0);
 253         do_test (15, 0, hlen, klen, 1);
 254         do_test (15, 3, hlen, klen, 0);
 255         do_test (15, 3, hlen, klen, 1);
 256         do_test (15, 9, hlen, klen, 0);
 257         do_test (15, 9, hlen, klen, 1);
 258         do_test (15, 15, hlen, klen, 0);
 259         do_test (15, 15, hlen, klen, 1);
 260
 261         do_test (15, 15, hlen + klen * 4, klen * 4, 0);
 262         do_test (15, 15, hlen + klen * 4, klen * 4, 1);
 263       }
 264
 265   do_test (0, 0, page_size - 1, 16, 0);
 266   do_test (0, 0, page_size - 1, 16, 1);
 267
 268   return ret;
 269 }
 270
 271 #include <support/test-driver.c>