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a6111c2a7b
This should fix a lot of warnings on IRIX. If callers know what they're doing they can use discard_const_p() on their own. metze
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/*
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Unix SMB/CIFS implementation.
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Samba utility functions
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Copyright (C) Andrew Tridgell 1992-1999
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Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2008
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SAMBA_MEMORY_H_
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#define _SAMBA_MEMORY_H_
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#ifndef SAFE_FREE /* Oh no this is also defined in tdb.h */
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/**
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* Free memory if the pointer and zero the pointer.
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*
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* @note You are explicitly allowed to pass NULL pointers -- they will
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* always be ignored.
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**/
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#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
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#endif
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/**
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* Type-safe version of malloc. Allocated one copy of the
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* specified data type.
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*/
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#define malloc_p(type) (type *)malloc(sizeof(type))
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/**
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* Allocate an array of elements of one data type. Does type-checking.
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*/
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#define malloc_array_p(type, count) (type *)realloc_array(NULL, sizeof(type), count, false)
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/**
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* Resize an array of elements of one data type. Does type-checking.
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*/
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#define realloc_p(p, type, count) (type *)realloc_array(p, sizeof(type), count, false)
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/**
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* zero a structure
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*/
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#ifndef ZERO_STRUCT
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#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
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#endif
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/**
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* zero a structure given a pointer to the structure
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*/
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#ifndef ZERO_STRUCTP
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#define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
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#endif
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/**
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* zero a structure given a pointer to the structure - no zero check
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*/
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#ifndef ZERO_STRUCTPN
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#define ZERO_STRUCTPN(x) memset((char *)(x), 0, sizeof(*(x)))
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#endif
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/* zero an array - note that sizeof(array) must work - ie. it must not be a
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pointer */
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#ifndef ZERO_ARRAY
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#define ZERO_ARRAY(x) memset((char *)(x), 0, sizeof(x))
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#endif
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/**
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* work out how many elements there are in a static array
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*/
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#ifndef ARRAY_SIZE
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#define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
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#endif
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/**
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* pointer difference macro
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*/
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#ifndef PTR_DIFF
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#define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
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#endif
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/**
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this is a warning hack. The idea is to use this everywhere that we
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get the "discarding const" warning from gcc. That doesn't actually
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fix the problem of course, but it means that when we do get to
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cleaning them up we can do it by searching the code for
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discard_const.
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It also means that other error types aren't as swamped by the noise
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of hundreds of const warnings, so we are more likely to notice when
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we get new errors.
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Please only add more uses of this macro when you find it
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_really_ hard to fix const warnings. Our aim is to eventually use
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this function in only a very few places.
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Also, please call this via the discard_const_p() macro interface, as that
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makes the return type safe.
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*/
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#ifndef discard_const
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#define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
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#endif
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/** Type-safe version of discard_const */
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#ifndef discard_const_p
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#define discard_const_p(type, ptr) ((type *)discard_const(ptr))
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#endif
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#endif /* _SAMBA_MEMORY_H_ */
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