FreeTDS API

macros.h
1 /* FreeTDS - Library of routines accessing Sybase and Microsoft databases
2 * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Brian Bruns
3 * Copyright (C) 2010-2017 Frediano Ziglio
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
19 */
20
21 #ifndef _freetds_macros_h_
22 #define _freetds_macros_h_
23
24 #ifndef _freetds_config_h_
25 #error should include config.h before
26 #endif
27
28 #if HAVE_STDDEF_H
29 #include <stddef.h>
30 #endif /* HAVE_STDDEF_H */
31
32 #include "tds_sysdep_public.h"
33
34 #define TDS_ZERO_FREE(x) do {free((x)); (x) = NULL;} while(0)
35 #define TDS_VECTOR_SIZE(x) (sizeof(x)/sizeof(x[0]))
36
37 #ifdef offsetof
38 #define TDS_OFFSET(type, field) offsetof(type, field)
39 #else
40 #define TDS_OFFSET(type, field) (((char*)&((type*)0)->field)-((char*)0))
41 #endif
42
43 #if ENABLE_EXTRA_CHECKS
44 # if defined(__llvm__) || (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)))
45 # define TDS_COMPILE_CHECK(name,check) \
46 _Static_assert(check,#name)
47 # elif defined(__GNUC__) && __GNUC__ >= 2
48 # define TDS_COMPILE_CHECK(name,check) \
49 extern int name[(check)?1:-1] __attribute__ ((unused))
50 # else
51 # define TDS_COMPILE_CHECK(name,check) \
52 extern int name[(check)?1:-1]
53 # endif
54 # define TDS_EXTRA_CHECK(stmt) stmt
55 #else
56 # define TDS_COMPILE_CHECK(name,check) \
57 extern int disabled_check_##name
58 # define TDS_EXTRA_CHECK(stmt)
59 #endif
60
61 #if defined(__GNUC__) && __GNUC__ >= 3
62 # define TDS_LIKELY(x) __builtin_expect(!!(x), 1)
63 # define TDS_UNLIKELY(x) __builtin_expect(!!(x), 0)
64 #else
65 # define TDS_LIKELY(x) (x)
66 # define TDS_UNLIKELY(x) (x)
67 #endif
68
69 #if ENABLE_EXTRA_CHECKS && defined(__GNUC__) && __GNUC__ >= 4
70 #define TDS_WUR __attribute__ ((__warn_unused_result__))
71 #else
72 #define TDS_WUR
73 #endif
74
75 #define TDS_INT2PTR(i) ((void*)(((char*)0)+((intptr_t)(i))))
76 #define TDS_PTR2INT(p) ((int)(((char*)(p))-((char*)0)))
77
78 #endif