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/* Alignment/padding coverage test for string comparison.
Copyright (C) 2016-2024 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 performs test comparisons with various (mis)alignments and
characters in the padding. It is partly a regression test for bug
20327. */
#include <limits.h>
#include <malloc.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <libc-diag.h>
static int
signum (int val)
{
if (val < 0)
return -1;
if (val > 0)
return 1;
else
return 0;
}
static size_t
max_size_t (size_t left, size_t right)
{
if (left > right)
return left;
else
return right;
}
/* Wrappers for strncmp and strncasecmp which determine the maximum
string length in some, either based on the input string length, or
using fixed constants. */
static int
strncmp_no_terminator (const char *left, const char *right)
{
size_t left_len = strlen (left);
size_t right_len = strlen (right);
return strncmp (left, right, max_size_t (left_len, right_len));
}
static int
strncasecmp_no_terminator (const char *left, const char *right)
{
size_t left_len = strlen (left);
size_t right_len = strlen (right);
return strncasecmp (left, right, max_size_t (left_len, right_len));
}
static int
strncmp_terminator (const char *left, const char *right)
{
size_t left_len = strlen (left);
size_t right_len = strlen (right);
return strncmp (left, right, max_size_t (left_len, right_len));
}
static int
strncasecmp_terminator (const char *left, const char *right)
{
size_t left_len = strlen (left);
size_t right_len = strlen (right);
return strncasecmp (left, right, max_size_t (left_len, right_len));
}
static int
strncmp_64 (const char *left, const char *right)
{
return strncmp (left, right, 64);
}
static int
strncasecmp_64 (const char *left, const char *right)
{
return strncasecmp (left, right, 64);
}
static int
strncmp_max (const char *left, const char *right)
{
DIAG_PUSH_NEEDS_COMMENT;
#if __GNUC_PREREQ (7, 0)
/* GCC 9 warns about the size passed to strncmp being larger than
PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */
DIAG_IGNORE_NEEDS_COMMENT (9, "-Wstringop-overflow=");
#endif
#if __GNUC_PREREQ (11, 0)
/* Likewise GCC 11, with a different warning option. */
DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread");
#endif
return strncmp (left, right, SIZE_MAX);
DIAG_POP_NEEDS_COMMENT;
}
static int
strncasecmp_max (const char *left, const char *right)
{
DIAG_PUSH_NEEDS_COMMENT;
#if __GNUC_PREREQ (7, 0)
/* GCC 9 warns about the size passed to strncasecmp being larger
than PTRDIFF_MAX; the use of SIZE_MAX is deliberate here. */
DIAG_IGNORE_NEEDS_COMMENT (9, "-Wstringop-overflow=");
#endif
#if __GNUC_PREREQ (11, 0)
/* Likewise GCC 11, with a different warning option. */
DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overread");
#endif
return strncasecmp (left, right, SIZE_MAX);
DIAG_POP_NEEDS_COMMENT;
}
int
do_test (void)
{
enum {
max_align = 64,
max_string_length = 33
};
size_t blob_size = max_align + max_string_length + 1;
char *left = memalign (max_align, blob_size);
char *right = memalign (max_align, blob_size);
if (left == NULL || right == NULL)
{
printf ("error: out of memory\n");
return 1;
}
const struct
{
const char *name;
int (*implementation) (const char *, const char *);
} functions[] =
{
{ "strcmp", strcmp },
{ "strcasecmp", strcasecmp },
{ "strncmp (without NUL)", strncmp_no_terminator},
{ "strncasecmp (without NUL)", strncasecmp_no_terminator},
{ "strncmp (with NUL)", strncmp_terminator},
{ "strncasecmp (with NUL)", strncasecmp_terminator},
{ "strncmp (length 64)", strncmp_64},
{ "strncasecmp (length 64)", strncasecmp_64},
{ "strncmp (length SIZE_MAX)", strncmp_max},
{ "strncasecmp (length SIZE_MAX)", strncasecmp_max},
{ NULL, NULL }
};
const char *const strings[] =
{
"",
"0",
"01",
"01234567",
"0123456789abcde",
"0123456789abcdef",
"0123456789abcdefg",
"1",
"10",
"123456789abcdef",
"123456789abcdefg",
"23456789abcdef",
"23456789abcdefg",
"abcdefghijklmnopqrstuvwxyzABCDEF",
NULL
};
const unsigned char pads[] =
{ 0, 1, 32, 64, 128, '0', '1', 'e', 'f', 'g', 127, 192, 255 };
bool errors = false;
for (int left_idx = 0; strings[left_idx] != NULL; ++left_idx)
for (int left_align = 0; left_align < max_align; ++left_align)
for (unsigned pad_left = 0; pad_left < sizeof (pads); ++pad_left)
{
memset (left, pads[pad_left], blob_size);
strcpy (left + left_align, strings[left_idx]);
for (int right_idx = 0; strings[right_idx] != NULL; ++right_idx)
for (unsigned pad_right = 0; pad_right < sizeof (pads);
++pad_right)
for (int right_align = 0; right_align < max_align;
++right_align)
{
memset (right, pads[pad_right], blob_size);
strcpy (right + right_align, strings[right_idx]);
for (int func = 0; functions[func].name != NULL; ++func)
{
int expected = left_idx - right_idx;
int actual = functions[func].implementation
(left + left_align, right + right_align);
if (signum (actual) != signum (expected))
{
printf ("error: mismatch for %s: %d\n"
" left: \"%s\"\n"
" right: \"%s\"\n"
" pad_left = %u, pad_right = %u,\n"
" left_align = %d, right_align = %d\n",
functions[func].name, actual,
strings[left_idx], strings[right_idx],
pad_left, pad_right,
left_align, right_align);
errors = true;
}
}
}
}
free (right);
free (left);
return errors;
}
/* The nested loops need a long time to complete on slower
machines. */
#define TIMEOUT 600
#include <support/test-driver.c>
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