string/test-strstr.c

   1 /* Test and measure strstr functions.
   2    Copyright (C) 2010-2022 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 simple_strstr
  25 #define libc_hidden_builtin_def(arg) /* nothing */
  26 #define __strnlen strnlen
  27 #include "strstr.c"
  28
  29
  30 static char *
  31 stupid_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 (stupid_strstr, 0)
  56 IMPL (simple_strstr, 0)
  57 IMPL (strstr, 1)
  58
  59
  60 static int
  61 check_result (impl_t *impl, const char *s1, const char *s2,
  62               char *exp_result)
  63 {
  64   char *result = CALL (impl, s1, s2);
  65   if (result != exp_result)
  66     {
  67       error (0, 0, "Wrong result in function %s %s %s", impl->name,
  68              (result == NULL) ? "(null)" : result,
  69              (exp_result == NULL) ? "(null)" : 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_stack[] = ", enable_static, \0, enable_shared, ";
 142   const size_t s1_byte_count = 18;
 143   const char *s2_stack = &(s1_stack[s1_byte_count]);
 144   const size_t s2_byte_count = 18;
 145   char *exp_result;
 146   const size_t page_size_real = getpagesize ();
 147
 148   /* Haystack at end of page.  The following page is protected.  */
 149   char *s1_page_end = (void *) buf1 + page_size - s1_byte_count;
 150   strcpy (s1_page_end, s1_stack);
 151
 152   /* Haystack which crosses a page boundary.
 153      Note: page_size is at least 2 * getpagesize.  See test_init.  */
 154   char *s1_page_cross = (void *) buf1 + page_size_real - 8;
 155   strcpy (s1_page_cross, s1_stack);
 156
 157   /* Needle at end of page.  The following page is protected.  */
 158   char *s2_page_end = (void *) buf2 + page_size - s2_byte_count;
 159   strcpy (s2_page_end, s2_stack);
 160
 161   /* Needle which crosses a page boundary.
 162      Note: page_size is at least 2 * getpagesize.  See test_init.  */
 163   char *s2_page_cross = (void *) buf2 + page_size_real - 8;
 164   strcpy (s2_page_cross, s2_stack);
 165
 166   exp_result = stupid_strstr (s1_stack, s2_stack);
 167   FOR_EACH_IMPL (impl, 0)
 168     {
 169       check_result (impl, s1_stack, s2_stack, exp_result);
 170       check_result (impl, s1_stack, s2_page_end, exp_result);
 171       check_result (impl, s1_stack, s2_page_cross, exp_result);
 172
 173       check_result (impl, s1_page_end, s2_stack, exp_result);
 174       check_result (impl, s1_page_end, s2_page_end, exp_result);
 175       check_result (impl, s1_page_end, s2_page_cross, exp_result);
 176
 177       check_result (impl, s1_page_cross, s2_stack, exp_result);
 178       check_result (impl, s1_page_cross, s2_page_end, exp_result);
 179       check_result (impl, s1_page_cross, s2_page_cross, exp_result);
 180     }
 181 }
 182
 183 #define N 1024
 184
 185 static void
 186 pr23637 (void)
 187 {
 188   char *h = (char*) buf1;
 189   char *n = (char*) buf2;
 190
 191   for (int i = 0; i < N; i++)
 192     {
 193       n[i] = 'x';
 194       h[i] = ' ';
 195       h[i + N] = 'x';
 196     }
 197
 198   n[N] = '\0';
 199   h[N * 2] = '\0';
 200
 201   /* Ensure we don't match at the first 'x'.  */
 202   h[0] = 'x';
 203
 204   char *exp_result = stupid_strstr (h, n);
 205   FOR_EACH_IMPL (impl, 0)
 206     check_result (impl, h, n, exp_result);
 207 }
 208
 209 static int
 210 test_main (void)
 211 {
 212   test_init ();
 213
 214   check1 ();
 215   check2 ();
 216   pr23637 ();
 217
 218   printf ("%23s", "");
 219   FOR_EACH_IMPL (impl, 0)
 220     printf ("\t%s", impl->name);
 221   putchar ('\n');
 222
 223   for (size_t klen = 2; klen < 32; ++klen)
 224     for (size_t hlen = 2 * klen; hlen < 16 * klen; hlen += klen)
 225       {
 226         do_test (0, 0, hlen, klen, 0);
 227         do_test (0, 0, hlen, klen, 1);
 228         do_test (0, 3, hlen, klen, 0);
 229         do_test (0, 3, hlen, klen, 1);
 230         do_test (0, 9, hlen, klen, 0);
 231         do_test (0, 9, hlen, klen, 1);
 232         do_test (0, 15, hlen, klen, 0);
 233         do_test (0, 15, hlen, klen, 1);
 234
 235         do_test (3, 0, hlen, klen, 0);
 236         do_test (3, 0, hlen, klen, 1);
 237         do_test (3, 3, hlen, klen, 0);
 238         do_test (3, 3, hlen, klen, 1);
 239         do_test (3, 9, hlen, klen, 0);
 240         do_test (3, 9, hlen, klen, 1);
 241         do_test (3, 15, hlen, klen, 0);
 242         do_test (3, 15, hlen, klen, 1);
 243
 244         do_test (9, 0, hlen, klen, 0);
 245         do_test (9, 0, hlen, klen, 1);
 246         do_test (9, 3, hlen, klen, 0);
 247         do_test (9, 3, hlen, klen, 1);
 248         do_test (9, 9, hlen, klen, 0);
 249         do_test (9, 9, hlen, klen, 1);
 250         do_test (9, 15, hlen, klen, 0);
 251         do_test (9, 15, hlen, klen, 1);
 252
 253         do_test (15, 0, hlen, klen, 0);
 254         do_test (15, 0, hlen, klen, 1);
 255         do_test (15, 3, hlen, klen, 0);
 256         do_test (15, 3, hlen, klen, 1);
 257         do_test (15, 9, hlen, klen, 0);
 258         do_test (15, 9, hlen, klen, 1);
 259         do_test (15, 15, hlen, klen, 0);
 260         do_test (15, 15, hlen, klen, 1);
 261
 262         do_test (15, 15, hlen + klen * 4, klen * 4, 0);
 263         do_test (15, 15, hlen + klen * 4, klen * 4, 1);
 264       }
 265
 266   do_test (0, 0, page_size - 1, 16, 0);
 267   do_test (0, 0, page_size - 1, 16, 1);
 268
 269   return ret;
 270 }
 271
 272 #include <support/test-driver.c>