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/* constructor-helpers.c - Helper library for the constructor test
*
* Copyright © 2023 Luca Bacci
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This 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.
*
* This 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 this library; if not, see <http://www.gnu.org/licenses/>.
*/
/* This helper library manages a set of strings. Strings can be added,
* removed and checked for presence. This library does not call into
* libc, so can be used from module constructors in a safe manner on
* a wide range of operating systems.
*
* GLib is used only for assertions or hard errors; in such cases we
* don't really care about supported libc calls, as the test ought to
* fail anyway.
*/
#include <stddef.h> /* for size_t */
#include <glib.h>
#if defined (_MSC_VER)
# pragma optimize ("", off)
#else
# if defined (__clang__)
# pragma clang optimize off
# elif defined (__GNUC__)
# pragma GCC optimize ("O0")
# endif
#endif
#if defined(_WIN32)
#define MODULE_EXPORT \
__declspec (dllexport)
#elif defined (__GNUC__)
#define MODULE_EXPORT \
__attribute__((visibility("default")))
#else
#define MODULE_EXPORT
#endif
char buffer[500];
size_t position;
MODULE_EXPORT
void string_add (const char *string);
MODULE_EXPORT
void string_add_exclusive (const char *string);
MODULE_EXPORT
int string_remove (const char *string);
MODULE_EXPORT
int string_find (const char *string);
MODULE_EXPORT
void string_check (const char *string);
static size_t
strlen_ (const char *string)
{
size_t i = 0;
g_assert_nonnull (string);
while (string[i] != 0)
i++;
return i;
}
static void
memmove_ (char *buf,
size_t from,
size_t size,
size_t to)
{
g_assert_true (to <= from);
for (size_t i = 0; i < size; i++)
buffer[to + i] = buffer[from + i];
}
static void
memcpy_ (char *dst,
const char *src,
size_t size)
{
for (size_t i = 0; i < size; i++)
dst[i] = src[i];
}
static void
memset_ (char *dst,
char val,
size_t size)
{
for (size_t i = 0; i < size; i++)
dst[i] = val;
}
static size_t
string_find_index_ (const char *string)
{
size_t string_len;
size_t i = 0;
g_assert_nonnull (string);
g_assert_true ((string_len = strlen_ (string)) > 0);
for (i = 0; (i < sizeof (buffer) - position) && (buffer[i] != 0);)
{
const char *iter = &buffer[i];
size_t len = strlen_ (iter);
if (len == string_len && strcmp (iter, string) == 0)
return i;
i += len + 1;
}
return sizeof (buffer);
}
/**< private >
* string_add:
*
* @string: NULL-terminated string. Must not be empty
*
* Adds @string to the set
*/
MODULE_EXPORT
void
string_add (const char *string)
{
size_t len, size;
g_assert_nonnull (string);
g_assert_true ((len = strlen_ (string)) > 0);
size = len + 1;
if (size > sizeof (buffer) - position)
g_error ("Not enough space in the buffer");
memcpy_ (buffer + position, string, size);
position += size;
}
/**< private >
* string_add_exclusive:
*
* @string: NULL-terminated string. Must not be empty
*
* Adds @string to the set, asserting that it's not already present.
*/
MODULE_EXPORT
void
string_add_exclusive (const char *string)
{
if (string_find_index_ (string) < sizeof (buffer))
g_error ("string %s already set", string);
string_add (string);
}
/**< private >
* string_remove:
*
* @string: NULL-terminated string. Must not be empty
*
* Removes the first occurrence of @string from the set.
*
* Returns: 1 if the string was removed, 0 otherwise.
*/
MODULE_EXPORT
int
string_remove (const char *string)
{
size_t index = string_find_index_ (string);
size_t len, size;
if (index >= sizeof (buffer))
return 0;
g_assert_true ((len = strlen_ (string)) > 0);
size = len + 1;
memmove_ (buffer, index + size, index, position - (index + size));
position -= size;
memset_ (buffer + position, 0, size);
return 1;
}
/**< private >
* string_find:
*
* @string: NULL-terminated string. Must not be empty
*
* Returns 1 if the string is present, 0 otherwise
*/
MODULE_EXPORT
int string_find (const char *string)
{
return string_find_index_ (string) < sizeof (buffer);
}
/**< private >
* string_check:
*
* @string: NULL-terminated string. Must not be empty
*
* Asserts that @string is present in the set
*/
MODULE_EXPORT
void
string_check (const char *string)
{
if (string_find_index_ (string) >= sizeof (buffer))
g_error ("String %s not present", string);
}
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