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_
28 #include "charset/charset.h"
32 * @brief Helpful macros
35 struct substitute_context;
38 extern const char *logfile;
39 extern const char *panic_action;
41 #include "util/xfile.h"
42 #include "util/debug.h"
43 #include "util/mutex.h"
44 #include "util/byteorder.h"
45 #include "lib/util/util_proto.h"
50 #define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
53 * zero a structure given a pointer to the structure
55 #define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
58 * zero a structure given a pointer to the structure - no zero check
60 #define ZERO_STRUCTPN(x) memset((char *)(x), 0, sizeof(*(x)))
63 * pointer difference macro
65 #define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
68 * work out how many elements there are in a static array
70 #define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
75 #define SMB_ASSERT(b) do { if (!(b)) { \
76 DEBUG(0,("PANIC: assert failed at %s(%d)\n", __FILE__, __LINE__)); \
77 smb_panic("assert failed"); abort(); }} while (0)
80 * determine the lowest of two values
83 #define MIN(a,b) ((a)<(b)?(a):(b))
87 * determine the highest of two values
90 #define MAX(a,b) ((a)>(b)?(a):(b))
94 * determine absolute value
97 #define ABS(a) ((a)>0?(a):(-(a)))
100 #ifndef SAFE_FREE /* Oh no this is also defined in tdb.h */
102 * Free memory if the pointer and zero the pointer.
104 * @note You are explicitly allowed to pass NULL pointers -- they will
107 #define SAFE_FREE(x) do { if ((x) != NULL) {free(discard_const_p(void *, (x))); (x)=NULL;} } while(0)
111 * Type-safe version of malloc. Allocated one copy of the
112 * specified data type.
114 #define malloc_p(type) (type *)malloc(sizeof(type))
117 * Allocate an array of elements of one data type. Does type-checking.
119 #define malloc_array_p(type, count) (type *)realloc_array(NULL, sizeof(type), count)
122 * Resize an array of elements of one data type. Does type-checking.
124 #define realloc_p(p, type, count) (type *)realloc_array(p, sizeof(type), count)
126 #if defined(VALGRIND)
127 #define strlen(x) valgrind_strlen(x)
131 this is a warning hack. The idea is to use this everywhere that we
132 get the "discarding const" warning from gcc. That doesn't actually
133 fix the problem of course, but it means that when we do get to
134 cleaning them up we can do it by searching the code for
137 It also means that other error types aren't as swamped by the noise
138 of hundreds of const warnings, so we are more likely to notice when
141 Please only add more uses of this macro when you find it
142 _really_ hard to fix const warnings. Our aim is to eventually use
143 this function in only a very few places.
145 Also, please call this via the discard_const_p() macro interface, as that
146 makes the return type safe.
148 #define discard_const(ptr) ((void *)((intptr_t)(ptr)))
150 /** Type-safe version of discard_const */
151 #define discard_const_p(type, ptr) ((type *)discard_const(ptr))
153 #endif /* _SAMBA_UTIL_H_ */