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glibc/string/test-strcmp.c
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines 
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>
2021-09-03 22:06:44 +05:30

441 lines
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/* Test and measure strcmp and wcscmp functions.
Copyright (C) 1999-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 "wcscmp"
#else
# define TEST_NAME "strcmp"
#endif
#include "test-string.h"
#ifdef WIDE
# include <wchar.h>
# define L(str) L##str
# define STRCMP wcscmp
# define STRCPY wcscpy
# define STRLEN wcslen
# define MEMCPY wmemcpy
# define SIMPLE_STRCMP simple_wcscmp
# define STUPID_STRCMP stupid_wcscmp
# define CHAR wchar_t
# define UCHAR wchar_t
# define CHARBYTES 4
# define CHARBYTESLOG 2
# define CHARALIGN __alignof__ (CHAR)
# define MIDCHAR 0x7fffffff
# define LARGECHAR 0xfffffffe
# define CHAR__MAX WCHAR_MAX
# define CHAR__MIN WCHAR_MIN
/* Wcscmp uses signed semantics for comparison, not unsigned */
/* Avoid using substraction since possible overflow */
int
simple_wcscmp (const wchar_t *s1, const wchar_t *s2)
{
wchar_t c1, c2;
do
{
c1 = *s1++;
c2 = *s2++;
if (c2 == L'\0')
return c1 - c2;
}
while (c1 == c2);
return c1 < c2 ? -1 : 1;
}
int
stupid_wcscmp (const wchar_t *s1, const wchar_t *s2)
{
size_t ns1 = wcslen (s1) + 1;
size_t ns2 = wcslen (s2) + 1;
size_t n = ns1 < ns2 ? ns1 : ns2;
int ret = 0;
wchar_t c1, c2;
while (n--) {
c1 = *s1++;
c2 = *s2++;
if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0)
break;
}
return ret;
}
#else
# include <limits.h>
# define L(str) str
# define STRCMP strcmp
# define STRCPY strcpy
# define STRLEN strlen
# define MEMCPY memcpy
# define SIMPLE_STRCMP simple_strcmp
# define STUPID_STRCMP stupid_strcmp
# define CHAR char
# define UCHAR unsigned char
# define CHARBYTES 1
# define CHARBYTESLOG 0
# define CHARALIGN 1
# define MIDCHAR 0x7f
# define LARGECHAR 0xfe
# define CHAR__MAX CHAR_MAX
# define CHAR__MIN CHAR_MIN
/* Strcmp uses unsigned semantics for comparison. */
int
simple_strcmp (const char *s1, const char *s2)
{
int ret;
while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++);
return ret;
}
int
stupid_strcmp (const char *s1, const char *s2)
{
size_t ns1 = strlen (s1) + 1;
size_t ns2 = strlen (s2) + 1;
size_t n = ns1 < ns2 ? ns1 : ns2;
int ret = 0;
while (n--)
if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0)
break;
return ret;
}
#endif
typedef int (*proto_t) (const CHAR *, const CHAR *);
IMPL (STUPID_STRCMP, 1)
IMPL (SIMPLE_STRCMP, 1)
IMPL (STRCMP, 1)
static int
check_result (impl_t *impl,
const CHAR *s1, const CHAR *s2,
int exp_result)
{
int result = CALL (impl, s1, s2);
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,
int exp_result)
{
if (check_result (impl, s1, s2, exp_result) < 0)
return;
}
static void
do_test (size_t align1, size_t align2, size_t len, int max_char,
int exp_result)
{
size_t i;
CHAR *s1, *s2;
if (len == 0)
return;
align1 &= 63;
if (align1 + (len + 1) * CHARBYTES >= page_size)
return;
align2 &= 63;
if (align2 + (len + 1) * CHARBYTES >= page_size)
return;
/* Put them close to the end of page. */
i = align1 + CHARBYTES * (len + 2);
s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1);
i = align2 + CHARBYTES * (len + 2);
s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2);
for (i = 0; i < len; i++)
s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char;
s1[len] = s2[len] = 0;
s1[len + 1] = 23;
s2[len + 1] = 24 + exp_result;
s2[len - 1] -= exp_result;
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s1, s2, exp_result);
}
static void
do_random_tests (void)
{
UCHAR *p1 = (UCHAR *) (buf1 + page_size - 512 * CHARBYTES);
UCHAR *p2 = (UCHAR *) (buf2 + page_size - 512 * CHARBYTES);
for (size_t n = 0; n < ITERATIONS; n++)
{
/* for wcscmp case align1 and align2 mean here alignment
in wchar_t symbols, it equal 4*k alignment in bytes, we
don't check other alignments like for example
p1 = (wchar_t *)(buf1 + 1)
because it's wrong using of wchar_t type. */
size_t align1 = random () & 31;
size_t align2;
if (random () & 1)
align2 = random () & 31;
else
align2 = align1 + (random () & 24);
size_t pos = random () & 511;
size_t j = align1 > align2 ? align1 : align2;
if (pos + j >= 511)
pos = 510 - j - (random () & 7);
size_t len1 = random () & 511;
if (pos >= len1 && (random () & 1))
len1 = pos + (random () & 7);
if (len1 + j >= 512)
len1 = 511 - j - (random () & 7);
size_t len2;
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 (size_t 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 (size_t 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);
}
}
int 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 (p1[align1 + pos] < p2[align2 + pos])
result = -1;
else
result = 1;
}
p1[len1 + align1] = 0;
p2[len2 + align2] = 0;
FOR_EACH_IMPL (impl, 1)
{
int r = CALL (impl, (CHAR *) (p1 + align1), (CHAR *) (p2 + align2));
/* 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 (align in bytes: %zd, align in bytes: %zd, len1: %zd, len2: %zd, pos: %zd) %d != %d, p1 %p p2 %p",
n, impl->name, (size_t) (p1 + align1) & 63, (size_t) (p1 + align2) & 63, len1, len2, pos, r, result, p1, p2);
ret = 1;
}
}
}
}
static void
check (void)
{
CHAR *s1 = (CHAR *) (buf1 + 0xb2c);
CHAR *s2 = (CHAR *) (buf1 + 0xfd8);
STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"));
STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV"));
/* Check correct working for negatives values */
s1[0] = 1;
s2[0] = 1;
s1[1] = 1;
s2[1] = 1;
s1[2] = -1;
s2[2] = 3;
s1[3] = 0;
s2[3] = -1;
/* Check possible overflow bug, actual more for wcscmp */
s1[7] = CHAR__MIN;
s2[7] = CHAR__MAX;
size_t l1 = STRLEN (s1);
size_t l2 = STRLEN (s2);
for (size_t i1 = 0; i1 < l1; i1++)
for (size_t i2 = 0; i2 < l2; i2++)
{
int exp_result = SIMPLE_STRCMP (s1 + i1, s2 + i2);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1 + i1, s2 + i2, exp_result);
}
/* Test cases where there are multiple zero bytes after the first. */
for (size_t i = 0; i < 16 + 1; i++)
{
s1[i] = 0x00;
s2[i] = 0x00;
}
for (size_t i = 0; i < 16; i++)
{
int exp_result;
for (int val = 0x01; val < 0x100; val++)
{
for (size_t j = 0; j < i; j++)
{
s1[j] = val;
s2[j] = val;
}
s2[i] = val;
exp_result = SIMPLE_STRCMP (s1, s2);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1, s2, exp_result);
}
}
}
static void
check2 (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;
s2[(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_STRCMP (s1p, s2p);
FOR_EACH_IMPL (impl, 0)
check_result (impl, s1p, s2p, exp_result);
}
}
int
test_main (void)
{
size_t i;
test_init ();
check();
check2 ();
printf ("%23s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = 1; i < 32; ++i)
{
do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0);
do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1);
do_test (CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1);
}
for (i = 1; i < 10 + CHARBYTESLOG; ++i)
{
do_test (0, 0, 2 << i, MIDCHAR, 0);
do_test (0, 0, 2 << i, LARGECHAR, 0);
do_test (0, 0, 2 << i, MIDCHAR, 1);
do_test (0, 0, 2 << i, LARGECHAR, 1);
do_test (0, 0, 2 << i, MIDCHAR, -1);
do_test (0, 0, 2 << i, LARGECHAR, -1);
do_test (0, CHARBYTES * i, 2 << i, MIDCHAR, 1);
do_test (CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1);
}
for (i = 1; i < 8; ++i)
{
do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0);
do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0);
do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1);
do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1);
do_test (CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1);
do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1);
}
do_random_tests ();
return ret;
}
#include <support/test-driver.c>
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