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/* Test non-array inputs to string comparison functions.
Copyright (C) 2024 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/>. */
/* This skeleton file is included from string/test-strncmp-nonarray.c and
wcsmbs/test-wcsncmp-nonarray.c to test that reading of the arrays stops
at the first null character.
TEST_IDENTIFIER must be the test function identifier. TEST_NAME is
the same as a string.
CHAR must be defined as the character type. */
#include <array_length.h>
#include <string.h>
#include <support/check.h>
#include <support/next_to_fault.h>
#include <support/test-driver.h>
#include <sys/param.h>
#include <unistd.h>
/* Much shorter than test-Xnlen-nonarray.c because of deeply nested loops. */
enum { buffer_length = 80 };
/* The test buffer layout follows what is described test-Xnlen-nonarray.c,
except that there two buffers, left and right. The variables
a_count, zero_count, start_offset are all duplicated. */
/* Return the maximum string length for a string that starts at
start_offset. */
static int
string_length (int a_count, int start_offset)
{
if (start_offset == buffer_length || start_offset >= a_count)
return 0;
else
return a_count - start_offset;
}
/* This is the valid maximum length argument computation for
strnlen/wcsnlen. See text-Xnlen-nonarray.c. */
static int
maximum_length (int start_offset, int zero_count)
{
if (start_offset == buffer_length)
return 0;
else if (zero_count > 0)
/* Effectively unbounded, but we need to stop fairly low,
otherwise testing takes too long. */
return buffer_length + 32;
else
return buffer_length - start_offset;
}
typedef __typeof (TEST_IDENTIFIER) *proto_t;
#define TEST_MAIN
#include "test-string.h"
IMPL (TEST_IDENTIFIER, 1)
static int
test_main (void)
{
TEST_VERIFY_EXIT (sysconf (_SC_PAGESIZE) >= buffer_length);
test_init ();
struct support_next_to_fault left_ntf
= support_next_to_fault_allocate (buffer_length * sizeof (CHAR));
CHAR *left_buffer = (CHAR *) left_ntf.buffer;
struct support_next_to_fault right_ntf
= support_next_to_fault_allocate (buffer_length * sizeof (CHAR));
CHAR *right_buffer = (CHAR *) right_ntf.buffer;
FOR_EACH_IMPL (impl, 0)
{
printf ("info: testing %s\n", impl->name);
for (size_t i = 0; i < buffer_length; ++i)
left_buffer[i] = 'A';
for (int left_zero_count = 0; left_zero_count <= buffer_length;
++left_zero_count)
{
if (left_zero_count > 0)
left_buffer[buffer_length - left_zero_count] = 0;
int left_a_count = buffer_length - left_zero_count;
for (size_t i = 0; i < buffer_length; ++i)
right_buffer[i] = 'A';
for (int right_zero_count = 0; right_zero_count <= buffer_length;
++right_zero_count)
{
if (right_zero_count > 0)
right_buffer[buffer_length - right_zero_count] = 0;
int right_a_count = buffer_length - right_zero_count;
for (int left_start_offset = 0;
left_start_offset <= buffer_length;
++left_start_offset)
{
CHAR *left_start_pointer = left_buffer + left_start_offset;
int left_maxlen
= maximum_length (left_start_offset, left_zero_count);
int left_length
= string_length (left_a_count, left_start_offset);
for (int right_start_offset = 0;
right_start_offset <= buffer_length;
++right_start_offset)
{
CHAR *right_start_pointer
= right_buffer + right_start_offset;
int right_maxlen
= maximum_length (right_start_offset, right_zero_count);
int right_length
= string_length (right_a_count, right_start_offset);
/* Maximum length is modelled after strnlen/wcsnlen,
and must be valid for both pointer arguments at
the same time. */
int maxlen = MIN (left_maxlen, right_maxlen);
for (int length_argument = 0; length_argument <= maxlen;
++length_argument)
{
if (test_verbose)
{
printf ("left: zero_count=%d"
" a_count=%d start_offset=%d\n",
left_zero_count, left_a_count,
left_start_offset);
printf ("right: zero_count=%d"
" a_count=%d start_offset=%d\n",
right_zero_count, right_a_count,
right_start_offset);
printf ("length argument: %d\n",
length_argument);
}
/* Effective lengths bounded by length argument.
The effective length determines the
outcome of the comparison. */
int left_effective
= MIN (left_length, length_argument);
int right_effective
= MIN (right_length, length_argument);
if (left_effective == right_effective)
TEST_COMPARE (CALL (impl,
left_start_pointer,
right_start_pointer,
length_argument), 0);
else if (left_effective < right_effective)
TEST_COMPARE (CALL (impl,
left_start_pointer,
right_start_pointer,
length_argument) < 0, 1);
else
TEST_COMPARE (CALL (impl,
left_start_pointer,
right_start_pointer,
length_argument) > 0, 1);
}
}
}
}
}
}
return 0;
}
#include <support/test-driver.c>
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