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/* Measure strncpy functions.
Copyright (C) 2013-2021 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 BIG_CHAR MAX_CHAR
#ifdef WIDE
# define SMALL_CHAR 1273
#else
# define SMALL_CHAR 127
#endif /* !WIDE */
#ifndef STRNCPY_RESULT
# define STRNCPY_RESULT(dst, len, n) dst
# define TEST_MAIN
# ifndef WIDE
# define TEST_NAME "strncpy"
# else
# define TEST_NAME "wcsncpy"
# define generic_strncpy generic_wcsncpy
# endif /* WIDE */
# include "bench-string.h"
CHAR *
generic_strncpy (CHAR *dst, const CHAR *src, size_t n)
{
size_t nc = STRNLEN (src, n);
if (nc != n)
MEMSET (dst + nc, 0, n - nc);
return MEMCPY (dst, src, nc);
}
IMPL (STRNCPY, 1)
IMPL (generic_strncpy, 0)
#endif /* !STRNCPY_RESULT */
typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);
static void
do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t len, size_t n)
{
size_t i, iters = INNER_LOOP_ITERS_LARGE * (4 / CHARBYTES);
timing_t start, stop, cur;
if (CALL (impl, dst, src, n) != STRNCPY_RESULT (dst, len, n))
{
error (0, 0, "Wrong result in function %s %p %p", impl->name,
CALL (impl, dst, src, n), dst);
ret = 1;
return;
}
if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0)
{
error (0, 0, "Wrong result in function %s", impl->name);
ret = 1;
return;
}
if (n > len)
{
size_t i;
for (i = len; i < n; ++i)
if (dst [i] != '\0')
{
error (0, 0, "Wrong result in function %s", impl->name);
ret = 1;
return;
}
}
TIMING_NOW (start);
for (i = 0; i < iters; ++i)
{
CALL (impl, dst, src, n);
}
TIMING_NOW (stop);
TIMING_DIFF (cur, start, stop);
TIMING_PRINT_MEAN ((double) cur, (double) iters);
}
static void
do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
{
size_t i;
CHAR *s1, *s2;
/* For wcsncpy: align1 and align2 here mean alignment not in bytes,
but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)). */
align1 &= 7;
if ((align1 + len) * sizeof (CHAR) >= page_size)
return;
align2 &= 7;
if ((align2 + len) * sizeof (CHAR) >= page_size)
return;
s1 = (CHAR *) (buf1) + align1;
s2 = (CHAR *) (buf2) + align2;
for (i = 0; i < len; ++i)
s1[i] = 32 + 23 * i % (max_char - 32);
s1[len] = 0;
for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64;
++i)
s1[i] = 32 + 32 * i % (max_char - 32);
printf ("Length %4zd, n %4zd, alignment %2zd/%2zd:", len, n, align1, align2);
FOR_EACH_IMPL (impl, 0)
do_one_test (impl, s2, s1, len, n);
putchar ('\n');
}
static int
test_main (void)
{
size_t i;
test_init ();
printf ("%28s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (i = 1; i < 8; ++i)
{
do_test (i, i, 16, 16, SMALL_CHAR);
do_test (i, i, 16, 16, BIG_CHAR);
do_test (i, 2 * i, 16, 16, SMALL_CHAR);
do_test (2 * i, i, 16, 16, BIG_CHAR);
do_test (8 - i, 2 * i, 1 << i, 2 << i, SMALL_CHAR);
do_test (2 * i, 8 - i, 2 << i, 1 << i, SMALL_CHAR);
do_test (8 - i, 2 * i, 1 << i, 2 << i, BIG_CHAR);
do_test (2 * i, 8 - i, 2 << i, 1 << i, BIG_CHAR);
}
for (i = 1; i < 8; ++i)
{
do_test (0, 0, 4 << i, 8 << i, SMALL_CHAR);
do_test (0, 0, 16 << i, 8 << i, SMALL_CHAR);
do_test (8 - i, 2 * i, 4 << i, 8 << i, SMALL_CHAR);
do_test (8 - i, 2 * i, 16 << i, 8 << i, SMALL_CHAR);
}
return ret;
}
#include <support/test-driver.c>
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