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glibc/string/test-strncmp.c
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights 
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

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/* Test strncmp and wcsncmp functions.
Copyright (C) 1999-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Written by Jakub Jelinek <jakub@redhat.com>, 1999.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define TEST_MAIN
#ifdef WIDE
# define TEST_NAME "wcsncmp"
#else
# define TEST_NAME "strncmp"
#endif
#include "test-string.h"
#ifdef WIDE
# include <wchar.h>
# define L(str) L##str
# define STRNCMP wcsncmp
# define STRCPY wcscpy
# define STRDUP wcsdup
# define MEMCPY wmemcpy
# define SIMPLE_STRNCMP simple_wcsncmp
# define STUPID_STRNCMP stupid_wcsncmp
# define CHAR wchar_t
# define UCHAR wchar_t
# define CHARBYTES 4
# define CHAR__MAX WCHAR_MAX
# define CHAR__MIN WCHAR_MIN
/* Wcsncmp uses signed semantics for comparison, not unsigned.
Avoid using substraction since possible overflow */
int
simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
{
wchar_t c1, c2;
while (n--)
{
c1 = *s1++;
c2 = *s2++;
if (c1 == L('\0') || c1 != c2)
return c1 > c2 ? 1 : (c1 < c2 ? -1 : 0);
}
return 0;
}
int
stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n)
{
wchar_t c1, c2;
size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1;
n = ns1 < n ? ns1 : n;
n = ns2 < n ? ns2 : n;
while (n--)
{
c1 = *s1++;
c2 = *s2++;
if (c1 != c2)
return c1 > c2 ? 1 : -1;
}
return 0;
}
#else
# define L(str) str
# define STRNCMP strncmp
# define STRCPY strcpy
# define STRDUP strdup
# define MEMCPY memcpy
# define SIMPLE_STRNCMP simple_strncmp
# define STUPID_STRNCMP stupid_strncmp
# define CHAR char
# define UCHAR unsigned char
# define CHARBYTES 1
# define CHAR__MAX CHAR_MAX
# define CHAR__MIN CHAR_MIN
/* Strncmp uses unsigned semantics for comparison. */
int
simple_strncmp (const char *s1, const char *s2, size_t n)
{
int ret = 0;
while (n-- && (ret = *(unsigned char *) s1 - * (unsigned char *) s2++) == 0
&& *s1++);
return ret;
}
int
stupid_strncmp (const char *s1, const char *s2, size_t n)
{
size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1;
int ret = 0;
n = ns1 < n ? ns1 : n;
n = ns2 < n ? ns2 : n;
while (n-- && (ret = *(unsigned char *) s1++ - * (unsigned char *) s2++) == 0);
return ret;
}
#endif
typedef int (*proto_t) (const CHAR *, const CHAR *, size_t);
IMPL (STUPID_STRNCMP, 0)
IMPL (SIMPLE_STRNCMP, 0)
IMPL (STRNCMP, 1)
static int
check_result (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
int exp_result)
{
int result = CALL (impl, s1, s2, n);
if ((exp_result == 0 && result != 0)
|| (exp_result < 0 && result >= 0)
|| (exp_result > 0 && result <= 0))
{
error (0, 0, "Wrong result in function %s %d %d", impl->name,
result, exp_result);
ret = 1;
return -1;
}
return 0;
}
static void
do_one_test (impl_t *impl, const CHAR *s1, const CHAR *s2, size_t n,
int exp_result)
{
if (check_result (impl, s1, s2, n, exp_result) < 0)
return;
}
static void
do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char,
int exp_result)
{
size_t i, align_n;
CHAR *s1, *s2;
align1 &= ~(CHARBYTES - 1);
align2 &= ~(CHARBYTES - 1);
if (n == 0)
{
s1 = (CHAR *) (buf1 + page_size);
s2 = (CHAR *) (buf2 + page_size);
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s1, s2, n, 0);
return;
}
align1 &= 15;
align2 &= 15;
align_n = (page_size - n * CHARBYTES) & 15;
s1 = (CHAR *) (buf1 + page_size - n * CHARBYTES);
s2 = (CHAR *) (buf2 + page_size - n * CHARBYTES);
if (align1 < align_n)
s1 = (CHAR *) ((char *) s1 - (align_n - align1));
if (align2 < align_n)
s2 = (CHAR *) ((char *) s2 - (align_n - align2));
for (i = 0; i < n; i++)
s1[i] = s2[i] = 1 + 23 * i % max_char;
if (len < n)
{
s1[len] = 0;
s2[len] = 0;
if (exp_result < 0)
s2[len] = 32;
else if (exp_result > 0)
s1[len] = 64;
}
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s1, s2, n, exp_result);
}
static void
do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char,
int exp_result)
{
size_t i;
CHAR *s1, *s2;
align1 &= ~(CHARBYTES - 1);
align2 &= ~(CHARBYTES - 1);
if (n == 0)
return;
align1 &= 63;
if (align1 + (n + 1) * CHARBYTES >= page_size)
return;
align2 &= 63;
if (align2 + (n + 1) * CHARBYTES >= page_size)
return;
s1 = (CHAR *) (buf1 + align1);
s2 = (CHAR *) (buf2 + align2);
for (i = 0; i < n; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
s1[n] = 24 + exp_result;
s2[n] = 23;
s1[len] = 0;
s2[len] = 0;
if (exp_result < 0)
s2[len] = 32;
else if (exp_result > 0)
s1[len] = 64;
if (len >= n)
s2[n - 1] -= exp_result;
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s1, s2, n, exp_result);
}
static void
do_page_test (size_t offset1, size_t offset2, CHAR *s2)
{
CHAR *s1;
int exp_result;
if (offset1 * CHARBYTES >= page_size || offset2 * CHARBYTES >= page_size)
return;
s1 = (CHAR *) buf1;
s1 += offset1;
s2 += offset2;
exp_result= *s1;
FOR_EACH_IMPL (impl, 0)
{
check_result (impl, s1, s2, page_size, -exp_result);
check_result (impl, s2, s1, page_size, exp_result);
}
}
static void
do_random_tests (void)
{
size_t i, j, n, align1, align2, pos, len1, len2, size;
int result;
long r;
UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
for (n = 0; n < ITERATIONS; n++)
{
align1 = random () & 31;
if (random () & 1)
align2 = random () & 31;
else
align2 = align1 + (random () & 24);
pos = random () & 511;
size = random () & 511;
j = align1 > align2 ? align1 : align2;
if (pos + j >= 511)
pos = 510 - j - (random () & 7);
len1 = random () & 511;
if (pos >= len1 && (random () & 1))
len1 = pos + (random () & 7);
if (len1 + j >= 512)
len1 = 511 - j - (random () & 7);
if (pos >= len1)
len2 = len1;
else
len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
j = (pos > len2 ? pos : len2) + align1 + 64;
if (j > 512)
j = 512;
for (i = 0; i < j; ++i)
{
p1[i] = random () & 255;
if (i < len1 + align1 && !p1[i])
{
p1[i] = random () & 255;
if (!p1[i])
p1[i] = 1 + (random () & 127);
}
}
for (i = 0; i < j; ++i)
{
p2[i] = random () & 255;
if (i < len2 + align2 && !p2[i])
{
p2[i] = random () & 255;
if (!p2[i])
p2[i] = 1 + (random () & 127);
}
}
result = 0;
MEMCPY (p2 + align2, p1 + align1, pos);
if (pos < len1)
{
if (p2[align2 + pos] == p1[align1 + pos])
{
p2[align2 + pos] = random () & 255;
if (p2[align2 + pos] == p1[align1 + pos])
p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
}
if (pos < size)
{
if (p1[align1 + pos] < p2[align2 + pos])
result = -1;
else
result = 1;
}
}
p1[len1 + align1] = 0;
p2[len2 + align2] = 0;
FOR_EACH_IMPL (impl, 1)
{
r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2), size);
/* Test whether on 64-bit architectures where ABI requires
callee to promote has the promotion been done. */
asm ("" : "=g" (r) : "0" (r));
if ((r == 0 && result)
|| (r < 0 && result >= 0)
|| (r > 0 && result <= 0))
{
error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
n, impl->name, align1, align2, len1, len2, pos, size, r, result, p1, p2);
ret = 1;
}
}
}
}
static void
check1 (void)
{
CHAR *s1 = (CHAR *) (buf1 + 0xb2c);
CHAR *s2 = (CHAR *) (buf1 + 0xfd8);
size_t i, offset;
int exp_result;
STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"));
STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV"));
/* Check possible overflow bug for wcsncmp */
s1[4] = CHAR__MAX;
s2[4] = CHAR__MIN;
for (offset = 0; offset < 6; offset++)
{
for (i = 0; i < 80; i++)
{
exp_result = SIMPLE_STRNCMP (s1 + offset, s2 + offset, i);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1 + offset, s2 + offset, i, exp_result);
}
}
}
static void
check2 (void)
{
size_t i;
CHAR *s1, *s2;
s1 = (CHAR *) buf1;
for (i = 0; i < (page_size / CHARBYTES) - 1; i++)
s1[i] = 23;
s1[i] = 0;
s2 = STRDUP (s1);
for (i = 0; i < 64; ++i)
do_page_test ((3988 / CHARBYTES) + i, (2636 / CHARBYTES), s2);
free (s2);
}
static void
check3 (void)
{
/* To trigger bug 25933, we need a size that is equal to the vector
length times 4. In the case of AVX2 for Intel, we need 32 * 4. We
make this test generic and run it for all architectures as additional
boundary testing for such related algorithms. */
size_t size = 32 * 4;
CHAR *s1 = (CHAR *) (buf1 + (BUF1PAGES - 1) * page_size);
CHAR *s2 = (CHAR *) (buf2 + (BUF1PAGES - 1) * page_size);
int exp_result;
memset (s1, 'a', page_size);
memset (s2, 'a', page_size);
s1[(page_size / CHARBYTES) - 1] = (CHAR) 0;
/* Iterate over a size that is just below where we expect the bug to
trigger up to the size we expect will trigger the bug e.g. [99-128].
Likewise iterate the start of two strings between 30 and 31 bytes
away from the boundary to simulate alignment changes. */
for (size_t s = 99; s <= size; s++)
for (size_t s1a = 30; s1a < 32; s1a++)
for (size_t s2a = 30; s2a < 32; s2a++)
{
CHAR *s1p = s1 + (page_size / CHARBYTES - s) - s1a;
CHAR *s2p = s2 + (page_size / CHARBYTES - s) - s2a;
exp_result = SIMPLE_STRNCMP (s1p, s2p, s);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1p, s2p, s, exp_result);
}
}
int
test_main (void)
{
size_t i;
test_init ();
check1 ();
check2 ();
check3 ();
printf ("%23s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i =0; i < 16; ++i)
{
do_test (0, 0, 8, i, 127, 0);
do_test (0, 0, 8, i, 127, -1);
do_test (0, 0, 8, i, 127, 1);
do_test (i, i, 8, i, 127, 0);
do_test (i, i, 8, i, 127, 1);
do_test (i, i, 8, i, 127, -1);
do_test (i, 2 * i, 8, i, 127, 0);
do_test (2 * i, i, 8, i, 127, 1);
do_test (i, 3 * i, 8, i, 127, -1);
do_test (0, 0, 8, i, 255, 0);
do_test (0, 0, 8, i, 255, -1);
do_test (0, 0, 8, i, 255, 1);
do_test (i, i, 8, i, 255, 0);
do_test (i, i, 8, i, 255, 1);
do_test (i, i, 8, i, 255, -1);
do_test (i, 2 * i, 8, i, 255, 0);
do_test (2 * i, i, 8, i, 255, 1);
do_test (i, 3 * i, 8, i, 255, -1);
}
for (i = 1; i < 8; ++i)
{
do_test (0, 0, 8 << i, 16 << i, 127, 0);
do_test (0, 0, 8 << i, 16 << i, 127, 1);
do_test (0, 0, 8 << i, 16 << i, 127, -1);
do_test (0, 0, 8 << i, 16 << i, 255, 0);
do_test (0, 0, 8 << i, 16 << i, 255, 1);
do_test (0, 0, 8 << i, 16 << i, 255, -1);
do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 0);
do_test (8 - i, 2 * i, 8 << i, 16 << i, 127, 1);
do_test (2 * i, i, 8 << i, 16 << i, 255, 0);
do_test (2 * i, i, 8 << i, 16 << i, 255, 1);
}
do_test_limit (0, 0, 0, 0, 127, 0);
do_test_limit (4, 0, 21, 20, 127, 0);
do_test_limit (0, 4, 21, 20, 127, 0);
do_test_limit (8, 0, 25, 24, 127, 0);
do_test_limit (0, 8, 25, 24, 127, 0);
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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