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/*
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* Copyright (C) 2004, 2007-2017 Free Software Foundation, Inc.
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* Written by Bruno Haible and Eric Blake
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <string.h>
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#include "signature.h"
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SIGNATURE_CHECK (strstr, char *, (char const *, char const *));
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "zerosize-ptr.h"
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#include "macros.h"
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int
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main (int argc, char *argv[])
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{
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#if HAVE_DECL_ALARM
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/* Declare failure if test takes too long, by using default abort
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caused by SIGALRM. All known platforms that lack alarm also have
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a quadratic strstr, and the replacement strstr is known to not
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take too long. */
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int alarm_value = 50;
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signal (SIGALRM, SIG_DFL);
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alarm (alarm_value);
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#endif
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{
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const char input[] = "foo";
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const char *result = strstr (input, "");
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ASSERT (result == input);
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}
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{
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const char input[] = "foo";
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const char *result = strstr (input, "o");
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ASSERT (result == input + 1);
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}
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{
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/* On some platforms, the memchr() functions reads past the first
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occurrence of the byte to be searched, leading to an out-of-bounds
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read access for strstr().
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See <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521737>.
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This is a bug in memchr(), see the Austin Group's clarification
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<http://www.opengroup.org/austin/docs/austin_454.txt>. */
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const char *fix = "aBaaaaaaaaaaax";
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char *page_boundary = (char *) zerosize_ptr ();
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size_t len = strlen (fix) + 1;
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char *input = page_boundary ? page_boundary - len : malloc (len);
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const char *result;
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strcpy (input, fix);
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result = strstr (input, "B1x");
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ASSERT (result == NULL);
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if (!page_boundary)
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free (input);
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}
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{
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const char input[] = "ABC ABCDAB ABCDABCDABDE";
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const char *result = strstr (input, "ABCDABD");
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ASSERT (result == input + 15);
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}
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{
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const char input[] = "ABC ABCDAB ABCDABCDABDE";
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const char *result = strstr (input, "ABCDABE");
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ASSERT (result == NULL);
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}
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{
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const char input[] = "ABC ABCDAB ABCDABCDABDE";
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const char *result = strstr (input, "ABCDABCD");
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ASSERT (result == input + 11);
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}
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/* Check that a long periodic needle does not cause false positives. */
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{
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const char input[] = "F_BD_CE_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD"
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"_C3_88_20_EF_BF_BD_EF_BF_BD_EF_BF_BD"
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"_C3_A7_20_EF_BF_BD";
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const char need[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
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const char *result = strstr (input, need);
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ASSERT (result == NULL);
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}
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{
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const char input[] = "F_BD_CE_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD"
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"_C3_88_20_EF_BF_BD_EF_BF_BD_EF_BF_BD"
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"_C3_A7_20_EF_BF_BD_DA_B5_C2_A6_20"
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"_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
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const char need[] = "_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD_EF_BF_BD";
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const char *result = strstr (input, need);
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ASSERT (result == input + 115);
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}
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/* Check that a very long haystack is handled quickly if the needle is
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short and occurs near the beginning. */
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{
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size_t repeat = 10000;
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size_t m = 1000000;
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const char *needle =
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"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
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"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
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char *haystack = (char *) malloc (m + 1);
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if (haystack != NULL)
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{
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memset (haystack, 'A', m);
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haystack[0] = 'B';
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haystack[m] = '\0';
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for (; repeat > 0; repeat--)
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{
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ASSERT (strstr (haystack, needle) == haystack + 1);
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}
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free (haystack);
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}
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}
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/* Check that a very long needle is discarded quickly if the haystack is
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short. */
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{
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size_t repeat = 10000;
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size_t m = 1000000;
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const char *haystack =
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"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
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"ABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABAB";
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char *needle = (char *) malloc (m + 1);
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if (needle != NULL)
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{
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memset (needle, 'A', m);
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needle[m] = '\0';
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for (; repeat > 0; repeat--)
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{
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ASSERT (strstr (haystack, needle) == NULL);
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}
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free (needle);
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}
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}
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/* Check that the asymptotic worst-case complexity is not quadratic. */
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{
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size_t m = 1000000;
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char *haystack = (char *) malloc (2 * m + 2);
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char *needle = (char *) malloc (m + 2);
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if (haystack != NULL && needle != NULL)
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{
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const char *result;
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memset (haystack, 'A', 2 * m);
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haystack[2 * m] = 'B';
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haystack[2 * m + 1] = '\0';
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memset (needle, 'A', m);
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needle[m] = 'B';
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needle[m + 1] = '\0';
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result = strstr (haystack, needle);
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ASSERT (result == haystack + m);
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}
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free (needle);
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free (haystack);
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}
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/* Sublinear speed is only possible in memmem; strstr must examine
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every character of haystack to find its length. */
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{
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/* Ensure that with a barely periodic "short" needle, strstr's
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search does not mistakenly skip just past the match point.
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This use of strstr would mistakenly return NULL before
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gnulib v0.0-4927. */
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const char *haystack =
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"\n"
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"with_build_libsubdir\n"
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"with_local_prefix\n"
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"with_gxx_include_dir\n"
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"with_cpp_install_dir\n"
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"enable_generated_files_in_srcdir\n"
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"with_gnu_ld\n"
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"with_ld\n"
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"with_demangler_in_ld\n"
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"with_gnu_as\n"
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"with_as\n"
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"enable_largefile\n"
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"enable_werror_always\n"
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"enable_checking\n"
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"enable_coverage\n"
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"enable_gather_detailed_mem_stats\n"
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"enable_build_with_cxx\n"
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"with_stabs\n"
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"enable_multilib\n"
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"enable___cxa_atexit\n"
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"enable_decimal_float\n"
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"enable_fixed_point\n"
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"enable_threads\n"
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"enable_tls\n"
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"enable_objc_gc\n"
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"with_dwarf2\n"
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"enable_shared\n"
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"with_build_sysroot\n"
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"with_sysroot\n"
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"with_specs\n"
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"with_pkgversion\n"
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"with_bugurl\n"
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"enable_languages\n"
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"with_multilib_list\n";
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const char *needle = "\n"
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"with_gnu_ld\n";
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const char* p = strstr (haystack, needle);
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ASSERT (p - haystack == 114);
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}
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{
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/* Same bug, shorter trigger. */
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const char *haystack = "..wi.d.";
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const char *needle = ".d.";
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const char* p = strstr (haystack, needle);
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ASSERT (p - haystack == 4);
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}
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{
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/* Like the above, but trigger the flaw in two_way_long_needle
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by using a needle of length LONG_NEEDLE_THRESHOLD (32) or greater.
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Rather than trying to find the right alignment manually, I've
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arbitrarily chosen the following needle and template for the
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haystack, and ensure that for each placement of the needle in
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that haystack, strstr finds it. */
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const char *needle = "\nwith_gnu_ld-extend-to-len-32-b\n";
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const char *h =
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"\n"
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"with_build_libsubdir\n"
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"with_local_prefix\n"
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"with_gxx_include_dir\n"
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"with_cpp_install_dir\n"
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"with_e_\n"
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"..............................\n"
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"with_FGHIJKLMNOPQRSTUVWXYZ\n"
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"with_567890123456789\n"
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"with_multilib_list\n";
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size_t h_len = strlen (h);
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char *haystack = malloc (h_len + 1);
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size_t i;
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ASSERT (haystack);
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for (i = 0; i < h_len - strlen (needle); i++)
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{
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const char *p;
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memcpy (haystack, h, h_len + 1);
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memcpy (haystack + i, needle, strlen (needle) + 1);
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p = strstr (haystack, needle);
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ASSERT (p);
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ASSERT (p - haystack == i);
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}
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free (haystack);
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}
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return 0;
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}
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