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/* Measure strsep functions.
Copyright (C) 2013-2022 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
#define TEST_NAME "strsep"
#include "bench-string.h"
char *
simple_strsep (char **s1, char *s2)
{
char *begin;
char *s;
size_t j = 0;
begin = *s1;
s = begin;
if (begin == NULL)
return NULL;
ssize_t s2len = strlen (s2);
while (*s)
{
for (j = 0; j < s2len; j++)
{
if (*s == s2[j])
{
s[0] = '\0';
*s1 = s + 1;
return begin;
}
}
s++;
}
*s1 = NULL;
return begin;
}
char *
oldstrsep (char **stringp, const char *delim)
{
char *begin, *end;
begin = *stringp;
if (begin == NULL)
return NULL;
/* A frequent case is when the delimiter string contains only one
character. Here we don't need to call the expensive `strpbrk'
function and instead work using `strchr'. */
if (delim[0] == '\0' || delim[1] == '\0')
{
char ch = delim[0];
if (ch == '\0')
end = NULL;
else
{
if (*begin == ch)
end = begin;
else if (*begin == '\0')
end = NULL;
else
end = strchr (begin + 1, ch);
}
}
else
/* Find the end of the token. */
end = strpbrk (begin, delim);
if (end)
{
/* Terminate the token and set *STRINGP past NUL character. */
*end++ = '\0';
*stringp = end;
}
else
/* No more delimiters; this is the last token. */
*stringp = NULL;
return begin;
}
typedef char *(*proto_t) (const char **, const char *);
IMPL (simple_strsep, 0)
IMPL (strsep, 1)
IMPL (oldstrsep, 2)
static void
do_one_test (impl_t * impl, const char *s1, const char *s2)
{
size_t i, iters = INNER_LOOP_ITERS_SMALL;
timing_t start, stop, cur;
TIMING_NOW (start);
for (i = 0; i < iters; ++i)
{
const char *s1a = s1;
CALL (impl, &s1a, s2);
if (s1a != NULL)
((char*)s1a)[-1] = '1';
}
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 len1, size_t len2, int fail)
{
char *s2 = (char *) (buf2 + align2);
/* Search for a delimiter in a string containing mostly '0', so don't
use '0' as a delimiter. */
static const char d[] = "123456789abcdefg";
#define dl (sizeof (d) - 1)
char *ss2 = s2;
for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
{
size_t t = l > dl ? dl : l;
ss2 = mempcpy (ss2, d, t);
}
s2[len2] = '\0';
printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",
len1, len2, align1, align2, fail ? "fail" : "found");
FOR_EACH_IMPL (impl, 0)
{
char *s1 = (char *) (buf1 + align1);
memset (s1, '0', len1);
if (!fail)
s1[len1 / 2] = '1';
s1[len1] = '\0';
do_one_test (impl, s1, s2);
}
putchar ('\n');
}
static int
test_main (void)
{
test_init ();
printf ("%23s", "");
FOR_EACH_IMPL (impl, 0)
printf ("\t%s", impl->name);
putchar ('\n');
for (size_t klen = 2; klen < 32; ++klen)
for (size_t hlen = 4 * klen; hlen < 8 * klen; hlen += klen)
{
do_test (0, 0, hlen, klen, 0);
do_test (0, 0, hlen, klen, 1);
do_test (0, 3, hlen, klen, 0);
do_test (0, 3, hlen, klen, 1);
do_test (0, 9, hlen, klen, 0);
do_test (0, 9, hlen, klen, 1);
do_test (0, 15, hlen, klen, 0);
do_test (0, 15, hlen, klen, 1);
do_test (3, 0, hlen, klen, 0);
do_test (3, 0, hlen, klen, 1);
do_test (3, 3, hlen, klen, 0);
do_test (3, 3, hlen, klen, 1);
do_test (3, 9, hlen, klen, 0);
do_test (3, 9, hlen, klen, 1);
do_test (3, 15, hlen, klen, 0);
do_test (3, 15, hlen, klen, 1);
do_test (9, 0, hlen, klen, 0);
do_test (9, 0, hlen, klen, 1);
do_test (9, 3, hlen, klen, 0);
do_test (9, 3, hlen, klen, 1);
do_test (9, 9, hlen, klen, 0);
do_test (9, 9, hlen, klen, 1);
do_test (9, 15, hlen, klen, 0);
do_test (9, 15, hlen, klen, 1);
do_test (15, 0, hlen, klen, 0);
do_test (15, 0, hlen, klen, 1);
do_test (15, 3, hlen, klen, 0);
do_test (15, 3, hlen, klen, 1);
do_test (15, 9, hlen, klen, 0);
do_test (15, 9, hlen, klen, 1);
do_test (15, 15, hlen, klen, 0);
do_test (15, 15, hlen, klen, 1);
}
do_test (0, 0, page_size - 1, 16, 0);
do_test (0, 0, page_size - 1, 16, 1);
return ret;
}
#include <support/test-driver.c>
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