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 #define TDS_ZERO_FREE(x) do {free((x)); (x) = NULL;} while(0)
33 #define TDS_VECTOR_SIZE(x) (sizeof(x)/sizeof(x[0]))
34
35 #ifdef offsetof
36 #define TDS_OFFSET(type, field) offsetof(type, field)
37 #else
38 #define TDS_OFFSET(type, field) (((char*)&((type*)0)->field)-((char*)0))
39 #endif
40
41 #if ENABLE_EXTRA_CHECKS
42 # if defined(__llvm__) || (defined(__GNUC__) && (__GNUC__ >= 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)))
43 # define TDS_COMPILE_CHECK(name,check) \
44 _Static_assert(check,#name)
45 # elif defined(__GNUC__) && __GNUC__ >= 2
46 # define TDS_COMPILE_CHECK(name,check) \
47 extern int name[(check)?1:-1] __attribute__ ((unused))
48 # else
49 # define TDS_COMPILE_CHECK(name,check) \
50 extern int name[(check)?1:-1]
51 # endif
52 # define TDS_EXTRA_CHECK(stmt) stmt
53 #else
54 # define TDS_COMPILE_CHECK(name,check) \
55 extern int disabled_check_##name
56 # define TDS_EXTRA_CHECK(stmt)
57 #endif
58
59 #if defined(__GNUC__) && __GNUC__ >= 3
60 # define TDS_LIKELY(x) __builtin_expect(!!(x), 1)
61 # define TDS_UNLIKELY(x) __builtin_expect(!!(x), 0)
62 #else
63 # define TDS_LIKELY(x) (x)
64 # define TDS_UNLIKELY(x) (x)
65 #endif
66
67 #if ENABLE_EXTRA_CHECKS && defined(__GNUC__) && __GNUC__ >= 4
68 #define TDS_WUR __attribute__ ((__warn_unused_result__))
69 #else
70 #define TDS_WUR
71 #endif
72
73 #endif