/*
- * Copyright (C) 2004 Free Software Foundation
- * Written by Simon Josefsson
+ * Copyright (C) 2004, 2007-2013 Free Software Foundation, Inc.
+ * Written by Bruno Haible and Eric Blake
*
- * This program is free software; you can redistribute it and/or modify
+ * This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- * 02111-1307, USA. */
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
-#include <stdio.h>
#include <string.h>
-#include "memmem.h"
+
+#include "signature.h"
+SIGNATURE_CHECK (memmem, void *, (void const *, size_t, void const *, size_t));
+
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "zerosize-ptr.h"
+#include "macros.h"
+
+static void *
+null_ptr (void)
+{
+ return NULL;
+}
int
main (int argc, char *argv[])
{
- const char *big = "foo-bar-baz";
- char *p;
-
- p = memmem (big, "foo", strlen (big));
- if (p != big)
- {
- fprintf (stderr, "memmem FAILURE 1\n");
- return 1;
- }
-
- p = memmem (big, "baz", strlen (big));
- if (p != big + strlen (big) - 3)
- {
- fprintf (stderr, "memmem FAILURE 2\n");
- return 1;
-
- p = memmem (big, "-", strlen (big));
- if (p != big + 3)
- {
- fprintf (stderr, "memmem FAILURE 3\n");
- return 1;
- }
-
- p = memmem (big, "baz", strlen (big) - 1);
- if (p != NULL)
- {
- fprintf (stderr, "memmem FAILURE 4\n");
- return 1;
- }
+#if HAVE_DECL_ALARM
+ /* Declare failure if test takes too long, by using default abort
+ caused by SIGALRM. All known platforms that lack alarm also lack
+ memmem, and the replacement memmem is known to not take too
+ long. */
+ int alarm_value = 100;
+ signal (SIGALRM, SIG_DFL);
+ alarm (alarm_value);
+#endif
+
+ {
+ const char input[] = "foo";
+ const char *result = memmem (input, strlen (input), "", 0);
+ ASSERT (result == input);
+ }
+
+ {
+ const char input[] = "foo";
+ const char *result = memmem (input, strlen (input), "o", 1);
+ ASSERT (result == input + 1);
+ }
+
+ {
+ const char input[] = "ABC ABCDAB ABCDABCDABDE";
+ const char *result = memmem (input, strlen (input), "ABCDABD", 7);
+ ASSERT (result == input + 15);
+ }
+
+ {
+ const char input[] = "ABC ABCDAB ABCDABCDABDE";
+ const char *result = memmem (input, strlen (input), "ABCDABE", 7);
+ ASSERT (result == NULL);
+ }
+
+ {
+ const char input[] = "ABC ABCDAB ABCDABCDABDE";
+ const char *result = memmem (input, strlen (input), "ABCDABCD", 8);
+ ASSERT (result == input + 11);
+ }
+
+ /* Check that length 0 does not dereference the pointer. */
+ {
+ const char *result = memmem (zerosize_ptr (), 0, "foo", 3);
+ ASSERT (result == NULL);
+ }
+
+ {
+ const char input[] = "foo";
+ const char *result = memmem (input, strlen (input), null_ptr (), 0);
+ ASSERT (result == input);
+ }
+
+ /* Check that a long periodic needle does not cause false positives. */
+ {
+ const char input[] = ("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");
+ const char need[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
+ const char *result = memmem (input, strlen (input), need, strlen (need));
+ ASSERT (result == NULL);
+ }
+ {
+ const char input[] = ("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_DA_B5_C2_A6_20"
+ "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD");
+ const char need[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
+ const char *result = memmem (input, strlen (input), need, strlen (need));
+ ASSERT (result == input + 115);
+ }
+
+ /* Check that a very long haystack is handled quickly if the needle is
+ short and occurs near the beginning. */
+ {
+ size_t repeat = 10000;
+ size_t m = 1000000;
+ const char *needle =
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
+ size_t n = strlen (needle);
+ char *haystack = (char *) malloc (m + 1);
+ if (haystack != NULL)
+ {
+ memset (haystack, 'A', m);
+ haystack[0] = 'B';
+
+ for (; repeat > 0; repeat--)
+ {
+ ASSERT (memmem (haystack, m, needle, n) == haystack + 1);
+ }
+
+ free (haystack);
+ }
+ }
+
+ /* Check that a very long needle is discarded quickly if the haystack is
+ short. */
+ {
+ size_t repeat = 10000;
+ size_t m = 1000000;
+ const char *haystack =
+ "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
+ "ABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABAB";
+ size_t n = strlen (haystack);
+ char *needle = (char *) malloc (m + 1);
+ if (needle != NULL)
+ {
+ memset (needle, 'A', m);
+
+ for (; repeat > 0; repeat--)
+ {
+ ASSERT (memmem (haystack, n, needle, m) == NULL);
+ }
+
+ free (needle);
+ }
+ }
+
+ /* Check that the asymptotic worst-case complexity is not quadratic. */
+ {
+ size_t m = 1000000;
+ char *haystack = (char *) malloc (2 * m + 1);
+ char *needle = (char *) malloc (m + 1);
+ if (haystack != NULL && needle != NULL)
+ {
+ const char *result;
+
+ memset (haystack, 'A', 2 * m);
+ haystack[2 * m] = 'B';
+
+ memset (needle, 'A', m);
+ needle[m] = 'B';
+
+ result = memmem (haystack, 2 * m + 1, needle, m + 1);
+ ASSERT (result == haystack + m);
+ }
+ free (needle);
+ free (haystack);
+ }
+
+ /* Check that long needles not present in a haystack can be handled
+ with sublinear speed. */
+ {
+ size_t repeat = 10000;
+ size_t m = 1000000;
+ size_t n = 1000;
+ char *haystack = (char *) malloc (m);
+ char *needle = (char *) malloc (n);
+ if (haystack != NULL && needle != NULL)
+ {
+ const char *result;
+
+ memset (haystack, 'A', m);
+ memset (needle, 'B', n);
+
+ for (; repeat > 0; repeat--)
+ {
+ result = memmem (haystack, m, needle, n);
+ ASSERT (result == NULL);
+ }
+ }
+ free (haystack);
+ free (needle);
+ }
+
+ {
+ /* Ensure that with a barely periodic "short" needle, memmem's
+ search does not mistakenly skip just past the match point.
+ This use of memmem would mistakenly return NULL before
+ gnulib v0.0-4927. */
+ const char *haystack =
+ "\n"
+ "with_build_libsubdir\n"
+ "with_local_prefix\n"
+ "with_gxx_include_dir\n"
+ "with_cpp_install_dir\n"
+ "enable_generated_files_in_srcdir\n"
+ "with_gnu_ld\n"
+ "with_ld\n"
+ "with_demangler_in_ld\n"
+ "with_gnu_as\n"
+ "with_as\n"
+ "enable_largefile\n"
+ "enable_werror_always\n"
+ "enable_checking\n"
+ "enable_coverage\n"
+ "enable_gather_detailed_mem_stats\n"
+ "enable_build_with_cxx\n"
+ "with_stabs\n"
+ "enable_multilib\n"
+ "enable___cxa_atexit\n"
+ "enable_decimal_float\n"
+ "enable_fixed_point\n"
+ "enable_threads\n"
+ "enable_tls\n"
+ "enable_objc_gc\n"
+ "with_dwarf2\n"
+ "enable_shared\n"
+ "with_build_sysroot\n"
+ "with_sysroot\n"
+ "with_specs\n"
+ "with_pkgversion\n"
+ "with_bugurl\n"
+ "enable_languages\n"
+ "with_multilib_list\n";
+ const char *needle = "\n"
+ "with_gnu_ld\n";
+ const char* p = memmem (haystack, strlen (haystack),
+ needle, strlen (needle));
+ ASSERT (p - haystack == 114);
+ }
+
+ {
+ /* Same bug, shorter trigger. */
+ const char *haystack = "..wi.d.";
+ const char *needle = ".d.";
+ const char* p = memmem (haystack, strlen (haystack),
+ needle, strlen (needle));
+ ASSERT (p - haystack == 4);
+ }
+
+ {
+ /* Like the above, but trigger the flaw in two_way_long_needle
+ by using a needle of length LONG_NEEDLE_THRESHOLD (32) or greater.
+ Rather than trying to find the right alignment manually, I've
+ arbitrarily chosen the following needle and template for the
+ haystack, and ensure that for each placement of the needle in
+ that haystack, memmem finds it. */
+ const char *needle = "\nwith_gnu_ld-extend-to-len-32-b\n";
+ const char *h =
+ "\n"
+ "with_build_libsubdir\n"
+ "with_local_prefix\n"
+ "with_gxx_include_dir\n"
+ "with_cpp_install_dir\n"
+ "with_e_\n"
+ "..............................\n"
+ "with_FGHIJKLMNOPQRSTUVWXYZ\n"
+ "with_567890123456789\n"
+ "with_multilib_list\n";
+ size_t h_len = strlen (h);
+ char *haystack = malloc (h_len + 1);
+ size_t i;
+ ASSERT (haystack);
+ for (i = 0; i < h_len - strlen (needle); i++)
+ {
+ const char *p;
+ memcpy (haystack, h, h_len + 1);
+ memcpy (haystack + i, needle, strlen (needle) + 1);
+ p = memmem (haystack, strlen (haystack), needle, strlen (needle));
+ ASSERT (p);
+ ASSERT (p - haystack == i);
+ }
+ }
return 0;
}
projects / gnulib.git / blobdiff