macros.h
/* FreeTDS - Library of routines accessing Sybase and Microsoft databases
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Brian Bruns
* Copyright (C) 2010-2017 Frediano Ziglio
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef _freetds_macros_h_
#define _freetds_macros_h_
#ifndef _freetds_config_h_
#error should include config.h before
#endif
#if HAVE_STDDEF_H
#include <stddef.h>
#endif /* HAVE_STDDEF_H */
#define TDS_ZERO_FREE(x) do {free((x)); (x) = NULL;} while(0)
#define TDS_VECTOR_SIZE(x) (sizeof(x)/sizeof(x[0]))
#ifdef offsetof
#define TDS_OFFSET(type, field) offsetof(type, field)
#else
#define TDS_OFFSET(type, field) (((char*)&((type*)0)->field)-((char*)0))
#endif
#if ENABLE_EXTRA_CHECKS
# if defined(__llvm__) || (defined(__GNUC__) && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)))
# define TDS_COMPILE_CHECK(name,check) \
_Static_assert(check,#name)
# elif defined(__GNUC__) && __GNUC__ >= 2
# define TDS_COMPILE_CHECK(name,check) \
extern int name[(check)?1:-1] __attribute__ ((unused))
# else
# define TDS_COMPILE_CHECK(name,check) \
extern int name[(check)?1:-1]
# endif
# define TDS_EXTRA_CHECK(stmt) stmt
#else
# define TDS_COMPILE_CHECK(name,check) \
extern int disabled_check_##name
# define TDS_EXTRA_CHECK(stmt)
#endif
#if defined(__GNUC__) && __GNUC__ >= 3
# define TDS_LIKELY(x) __builtin_expect(!!(x), 1)
# define TDS_UNLIKELY(x) __builtin_expect(!!(x), 0)
#else
# define TDS_LIKELY(x) (x)
# define TDS_UNLIKELY(x) (x)
#endif
#if ENABLE_EXTRA_CHECKS && defined(__GNUC__) && __GNUC__ >= 4
#define TDS_WUR __attribute__ ((__warn_unused_result__))
#else
#define TDS_WUR
#endif
#define TDS_INT2PTR(i) ((void*)(((char*)0)+(i)))
#define TDS_PTR2INT(p) ((int)(((char*)(p))-((char*)0)))
#endif