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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef NBDKIT_MINMAX_H
#define NBDKIT_MINMAX_H
#include <config.h>
/* Safe MIN and MAX macros. These evaluate each parameter once. They
* work for any comparable type.
*
* __auto_type is a GCC extension, added in GCC 4.9 in 2014, and to
* Clang in 2015. The fallback uses typeof which was added a very
* long time ago. Note that OpenBSD lacks __auto_type so the fallback
* is required.
*/
#include "unique-name.h"
#undef MIN
#define MIN(x, y) \
MIN_1 ((x), (y), NBDKIT_UNIQUE_NAME (_x), NBDKIT_UNIQUE_NAME (_y))
#undef MAX
#define MAX(x, y) \
MAX_1 ((x), (y), NBDKIT_UNIQUE_NAME (_x), NBDKIT_UNIQUE_NAME (_y))
#ifdef HAVE_AUTO_TYPE
#define MIN_1(x, y, _x, _y) ({ \
__auto_type _x = (x); \
__auto_type _y = (y); \
_x < _y ? _x : _y; \
})
#define MAX_1(x, y, _x, _y) ({ \
__auto_type _x = (x); \
__auto_type _y = (y); \
_x > _y ? _x : _y; \
})
#else
#define MIN_1(x, y, _x, _y) ({ \
typeof (x) _x = (x); \
typeof (y) _y = (y); \
_x < _y ? _x : _y; \
})
#define MAX_1(x, y, _x, _y) ({ \
typeof (x) _x = (x); \
typeof (y) _y = (y); \
_x > _y ? _x : _y; \
})
#endif
#endif /* NBDKIT_MINMAX_H */
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