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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
512 lines
12 KiB
C
512 lines
12 KiB
C
/* Test strncmp and wcsncmp functions.
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Copyright (C) 1999-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#define TEST_MAIN
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#ifdef WIDE
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# define TEST_NAME "wcsncmp"
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#else
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# define TEST_NAME "strncmp"
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#endif
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#include "test-string.h"
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#ifdef WIDE
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# include <wchar.h>
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# define L(str) L##str
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# define STRNCMP wcsncmp
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# define STRCPY wcscpy
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# define STRDUP wcsdup
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# define MEMCPY wmemcpy
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# define SIMPLE_STRNCMP simple_wcsncmp
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# define STUPID_STRNCMP stupid_wcsncmp
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# define CHAR wchar_t
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# define UCHAR wchar_t
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# define CHARBYTES 4
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# define CHAR__MAX WCHAR_MAX
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# define CHAR__MIN WCHAR_MIN
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/* Wcsncmp uses signed semantics for comparison, not unsigned.
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Avoid using substraction since possible overflow */
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int
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simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
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{
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wchar_t c1, c2;
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while (n--)
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{
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c1 = *s1++;
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c2 = *s2++;
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if (c1 == L('\0') || c1 != c2)
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return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
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}
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return 0;
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}
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int
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stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
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{
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wchar_t c1, c2;
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size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1;
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n = ns1 < n ? ns1 : n;
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n = ns2 < n ? ns2 : n;
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while (n--)
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{
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c1 = *s1++;
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c2 = *s2++;
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if (c1 != c2)
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return c1 > c2 ? 1 : -1;
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}
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return 0;
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}
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#else
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# define L(str) str
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# define STRNCMP strncmp
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# define STRCPY strcpy
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# define STRDUP strdup
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# define MEMCPY memcpy
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# define SIMPLE_STRNCMP simple_strncmp
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# define STUPID_STRNCMP stupid_strncmp
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# define CHAR char
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# define UCHAR unsigned char
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# define CHARBYTES 1
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# define CHAR__MAX CHAR_MAX
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# define CHAR__MIN CHAR_MIN
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/* Strncmp uses unsigned semantics for comparison. */
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int
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simple_strncmp (const char *s1, const char *s2, size_t n)
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{
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int ret = 0;
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while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
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&& *s1++);
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return ret;
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}
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int
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stupid_strncmp (const char *s1, const char *s2, size_t n)
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{
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size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
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int ret = 0;
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n = ns1 < n ? ns1 : n;
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n = ns2 < n ? ns2 : n;
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while (n-- && (ret = *(unsigned char *) s1++ - * (unsigned char *) s2++) == 0);
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return ret;
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}
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#endif
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typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
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IMPL (STUPID_STRNCMP, 0)
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IMPL (SIMPLE_STRNCMP, 0)
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IMPL (STRNCMP, 1)
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static int
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check_result (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
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int exp_result)
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{
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int result = CALL (impl, s1, s2, n);
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if ((exp_result == 0 && result != 0)
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|| (exp_result < 0 && result >= 0)
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|| (exp_result > 0 && result <= 0))
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{
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error (0, 0, "Wrong result in function %s %d %d", impl->name,
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result, exp_result);
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ret = 1;
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return -1;
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}
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return 0;
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}
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static void
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do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
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int exp_result)
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{
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if (check_result (impl, s1, s2, n, exp_result) < 0)
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return;
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}
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static void
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do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
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int exp_result)
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{
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size_t i, align_n;
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CHAR *s1, *s2;
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align1 &= ~(CHARBYTES - 1);
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align2 &= ~(CHARBYTES - 1);
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if (n == 0)
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{
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s1 = (CHAR *) (buf1 + page_size);
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s2 = (CHAR *) (buf2 + page_size);
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, n, 0);
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return;
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}
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align1 &= 15;
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align2 &= 15;
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align_n = (page_size - n * CHARBYTES) & 15;
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s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
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s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
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if (align1 < align_n)
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s1 = (CHAR *) ((char *) s1 - (align_n - align1));
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if (align2 < align_n)
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s2 = (CHAR *) ((char *) s2 - (align_n - align2));
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for (i = 0; i < n; i++)
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s1[i] = s2[i] = 1 + 23 * i % max_char;
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if (len < n)
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{
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s1[len] = 0;
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s2[len] = 0;
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if (exp_result < 0)
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s2[len] = 32;
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else if (exp_result > 0)
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s1[len] = 64;
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}
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, n, exp_result);
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}
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static void
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do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
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int exp_result)
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{
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size_t i;
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CHAR *s1, *s2;
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align1 &= ~(CHARBYTES - 1);
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align2 &= ~(CHARBYTES - 1);
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if (n == 0)
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return;
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align1 &= 63;
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if (align1 + (n + 1) * CHARBYTES >= page_size)
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return;
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align2 &= 63;
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if (align2 + (n + 1) * CHARBYTES >= page_size)
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return;
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s1 = (CHAR *) (buf1 + align1);
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s2 = (CHAR *) (buf2 + align2);
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for (i = 0; i < n; i++)
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s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
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s1[n] = 24 + exp_result;
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s2[n] = 23;
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s1[len] = 0;
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s2[len] = 0;
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if (exp_result < 0)
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s2[len] = 32;
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else if (exp_result > 0)
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s1[len] = 64;
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if (len >= n)
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s2[n - 1] -= exp_result;
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FOR_EACH_IMPL (impl, 0)
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do_one_test (impl, s1, s2, n, exp_result);
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}
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static void
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do_page_test (size_t offset1, size_t offset2, CHAR *s2)
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{
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CHAR *s1;
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int exp_result;
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if (offset1 * CHARBYTES >= page_size || offset2 * CHARBYTES >= page_size)
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return;
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s1 = (CHAR *) buf1;
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s1 += offset1;
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s2 += offset2;
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exp_result= *s1;
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FOR_EACH_IMPL (impl, 0)
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{
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check_result (impl, s1, s2, page_size, -exp_result);
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check_result (impl, s2, s1, page_size, exp_result);
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}
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}
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static void
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do_random_tests (void)
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{
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size_t i, j, n, align1, align2, pos, len1, len2, size;
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int result;
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long r;
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UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
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UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
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for (n = 0; n < ITERATIONS; n++)
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{
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align1 = random () & 31;
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if (random () & 1)
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align2 = random () & 31;
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else
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align2 = align1 + (random () & 24);
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pos = random () & 511;
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size = random () & 511;
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j = align1 > align2 ? align1 : align2;
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if (pos + j >= 511)
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pos = 510 - j - (random () & 7);
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len1 = random () & 511;
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if (pos >= len1 && (random () & 1))
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len1 = pos + (random () & 7);
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if (len1 + j >= 512)
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len1 = 511 - j - (random () & 7);
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if (pos >= len1)
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len2 = len1;
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else
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len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
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j = (pos > len2 ? pos : len2) + align1 + 64;
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if (j > 512)
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j = 512;
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for (i = 0; i < j; ++i)
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{
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p1[i] = random () & 255;
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if (i < len1 + align1 && !p1[i])
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{
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p1[i] = random () & 255;
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if (!p1[i])
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p1[i] = 1 + (random () & 127);
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}
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}
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for (i = 0; i < j; ++i)
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{
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p2[i] = random () & 255;
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if (i < len2 + align2 && !p2[i])
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{
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p2[i] = random () & 255;
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if (!p2[i])
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p2[i] = 1 + (random () & 127);
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}
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}
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result = 0;
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MEMCPY (p2 + align2, p1 + align1, pos);
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if (pos < len1)
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{
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if (p2[align2 + pos] == p1[align1 + pos])
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{
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p2[align2 + pos] = random () & 255;
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if (p2[align2 + pos] == p1[align1 + pos])
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p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
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}
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if (pos < size)
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{
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if (p1[align1 + pos] < p2[align2 + pos])
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result = -1;
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else
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result = 1;
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}
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}
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p1[len1 + align1] = 0;
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p2[len2 + align2] = 0;
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FOR_EACH_IMPL (impl, 1)
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{
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r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2), size);
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/* Test whether on 64-bit architectures where ABI requires
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callee to promote has the promotion been done. */
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asm ("" : "=g" (r) : "0" (r));
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if ((r == 0 && result)
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|| (r < 0 && result >= 0)
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|| (r > 0 && result <= 0))
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{
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error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
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n, impl->name, align1, align2, len1, len2, pos, size, r, result, p1, p2);
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ret = 1;
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}
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}
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}
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}
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static void
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check1 (void)
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{
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CHAR *s1 = (CHAR *) (buf1 + 0xb2c);
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CHAR *s2 = (CHAR *) (buf1 + 0xfd8);
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size_t i, offset;
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int exp_result;
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STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"));
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STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV"));
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/* Check possible overflow bug for wcsncmp */
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s1[4] = CHAR__MAX;
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s2[4] = CHAR__MIN;
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for (offset = 0; offset < 6; offset++)
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{
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for (i = 0; i < 80; i++)
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{
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exp_result = SIMPLE_STRNCMP (s1 + offset, s2 + offset, i);
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, s1 + offset, s2 + offset, i, exp_result);
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}
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}
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}
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static void
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check2 (void)
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{
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size_t i;
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CHAR *s1, *s2;
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s1 = (CHAR *) buf1;
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for (i = 0; i < (page_size / CHARBYTES) - 1; i++)
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s1[i] = 23;
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s1[i] = 0;
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s2 = STRDUP (s1);
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for (i = 0; i < 64; ++i)
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do_page_test ((3988 / CHARBYTES) + i, (2636 / CHARBYTES), s2);
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free (s2);
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}
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static void
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check3 (void)
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{
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/* To trigger bug 25933, we need a size that is equal to the vector
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length times 4. In the case of AVX2 for Intel, we need 32 * 4. We
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make this test generic and run it for all architectures as additional
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boundary testing for such related algorithms. */
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size_t size = 32 * 4;
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CHAR *s1 = (CHAR *) (buf1 + (BUF1PAGES - 1) * page_size);
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CHAR *s2 = (CHAR *) (buf2 + (BUF1PAGES - 1) * page_size);
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int exp_result;
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memset (s1, 'a', page_size);
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memset (s2, 'a', page_size);
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s1[(page_size / CHARBYTES) - 1] = (CHAR) 0;
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/* Iterate over a size that is just below where we expect the bug to
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trigger up to the size we expect will trigger the bug e.g. [99-128].
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Likewise iterate the start of two strings between 30 and 31 bytes
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away from the boundary to simulate alignment changes. */
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for (size_t s = 99; s <= size; s++)
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for (size_t s1a = 30; s1a < 32; s1a++)
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for (size_t s2a = 30; s2a < 32; s2a++)
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{
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CHAR *s1p = s1 + (page_size / CHARBYTES - s) - s1a;
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CHAR *s2p = s2 + (page_size / CHARBYTES - s) - s2a;
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exp_result = SIMPLE_STRNCMP (s1p, s2p, s);
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FOR_EACH_IMPL (impl, 0)
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check_result (impl, s1p, s2p, s, exp_result);
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}
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}
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int
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test_main (void)
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{
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size_t i;
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test_init ();
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check1 ();
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check2 ();
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check3 ();
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printf ("%23s", "");
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FOR_EACH_IMPL (impl, 0)
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printf ("\t%s", impl->name);
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putchar ('\n');
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for (i =0; i < 16; ++i)
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{
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do_test (0, 0, 8, i, 127, 0);
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do_test (0, 0, 8, i, 127, -1);
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do_test (0, 0, 8, i, 127, 1);
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do_test (i, i, 8, i, 127, 0);
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do_test (i, i, 8, i, 127, 1);
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do_test (i, i, 8, i, 127, -1);
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do_test (i, 2 * i, 8, i, 127, 0);
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do_test (2 * i, i, 8, i, 127, 1);
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do_test (i, 3 * i, 8, i, 127, -1);
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do_test (0, 0, 8, i, 255, 0);
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do_test (0, 0, 8, i, 255, -1);
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do_test (0, 0, 8, i, 255, 1);
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do_test (i, i, 8, i, 255, 0);
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do_test (i, i, 8, i, 255, 1);
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do_test (i, i, 8, i, 255, -1);
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do_test (i, 2 * i, 8, i, 255, 0);
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do_test (2 * i, i, 8, i, 255, 1);
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do_test (i, 3 * i, 8, i, 255, -1);
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}
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for (i = 1; i < 8; ++i)
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{
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do_test (0, 0, 8 << i, 16 << i, 127, 0);
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do_test (0, 0, 8 << i, 16 << i, 127, 1);
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do_test (0, 0, 8 << i, 16 << i, 127, -1);
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do_test (0, 0, 8 << i, 16 << i, 255, 0);
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do_test (0, 0, 8 << i, 16 << i, 255, 1);
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do_test (0, 0, 8 << i, 16 << i, 255, -1);
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do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
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do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
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do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
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do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
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}
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|
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do_test_limit (0, 0, 0, 0, 127, 0);
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do_test_limit (4, 0, 21, 20, 127, 0);
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do_test_limit (0, 4, 21, 20, 127, 0);
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do_test_limit (8, 0, 25, 24, 127, 0);
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do_test_limit (0, 8, 25, 24, 127, 0);
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|
|
|
for (i = 0; i < 8; ++i)
|
|
{
|
|
do_test_limit (0, 0, 17 - i, 16 - i, 127, 0);
|
|
do_test_limit (0, 0, 17 - i, 16 - i, 255, 0);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 127, 0);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 127, 1);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 127, -1);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 255, 0);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 255, 1);
|
|
do_test_limit (0, 0, 15 - i, 16 - i, 255, -1);
|
|
}
|
|
|
|
do_random_tests ();
|
|
return ret;
|
|
}
|
|
|
|
#include <support/test-driver.c>
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