2 Unix SMB/CIFS implementation.
3 Utility functions for Samba
4 Copyright (C) Andrew Tridgell 1992-1999
5 Copyright (C) John H Terpstra 1996-1999
6 Copyright (C) Luke Kenneth Casson Leighton 1996-1999
7 Copyright (C) Paul Ashton 1998 - 1999
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #ifndef _SAMBA_UTIL_H_
25 #define _SAMBA_UTIL_H_
29 * @brief Helpful macros
32 struct substitute_context;
34 #include "util/xfile.h"
35 #include "util/debug.h"
36 #include "util/mutex.h"
37 #include "util/byteorder.h"
38 #include "util/util_proto.h"
43 #define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
46 * zero a structure given a pointer to the structure
48 #define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
51 * zero a structure given a pointer to the structure - no zero check
53 #define ZERO_STRUCTPN(x) memset((char *)(x), 0, sizeof(*(x)))
56 * pointer difference macro
58 #define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
61 * work out how many elements there are in a static array
63 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
68 #define SMB_ASSERT(b) do { if (!(b)) { \
69 DEBUG(0,("PANIC: assert failed at %s(%d)\n", __FILE__, __LINE__)); \
70 smb_panic("assert failed"); }} while (0)
73 * determine the lowest of two values
76 #define MIN(a,b) ((a)<(b)?(a):(b))
80 * determine the highest of two values
83 #define MAX(a,b) ((a)>(b)?(a):(b))
87 * determine absolute value
90 #define ABS(a) ((a)>0?(a):(-(a)))
93 #ifndef SAFE_FREE /* Oh no this is also defined in tdb.h */
95 * Free memory if the pointer and zero the pointer.
97 * @note You are explicitly allowed to pass NULL pointers -- they will
100 #define SAFE_FREE(x) do { if ((x) != NULL) {free(discard_const_p(void *, (x))); (x)=NULL;} } while(0)
104 * Type-safe version of malloc. Allocated one copy of the
105 * specified data type.
107 #define malloc_p(type) (type *)malloc(sizeof(type))
110 * Allocate an array of elements of one data type. Does type-checking.
112 #define malloc_array_p(type, count) (type *)realloc_array(NULL, sizeof(type), count)
115 * Resize an array of elements of one data type. Does type-checking.
117 #define realloc_p(p, type, count) (type *)realloc_array(p, sizeof(type), count)
119 #if defined(VALGRIND)
120 #define strlen(x) valgrind_strlen(x)
124 this is a warning hack. The idea is to use this everywhere that we
125 get the "discarding const" warning from gcc. That doesn't actually
126 fix the problem of course, but it means that when we do get to
127 cleaning them up we can do it by searching the code for
130 It also means that other error types aren't as swamped by the noise
131 of hundreds of const warnings, so we are more likely to notice when
134 Please only add more uses of this macro when you find it
135 _really_ hard to fix const warnings. Our aim is to eventually use
136 this function in only a very few places.
138 Also, please call this via the discard_const_p() macro interface, as that
139 makes the return type safe.
141 #define discard_const(ptr) ((void *)((intptr_t)(ptr)))
143 /** Type-safe version of discard_const */
144 #define discard_const_p(type, ptr) ((type *)discard_const(ptr))
146 #endif /* _SAMBA_UTIL_H_ */