/* 
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-1999
   Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2008
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef _SAMBA_MEMORY_H_
#define _SAMBA_MEMORY_H_

#ifndef SAFE_FREE /* Oh no this is also defined in tdb.h */
/**
 * Free memory if the pointer and zero the pointer.
 *
 * @note You are explicitly allowed to pass NULL pointers -- they will
 * always be ignored.
 **/
#define SAFE_FREE(x) do { if ((x) != NULL) {free(discard_const_p(void *, (x))); (x)=NULL;} } while(0)
#endif

/** 
 * Type-safe version of malloc. Allocated one copy of the 
 * specified data type.
 */
#define malloc_p(type) (type *)malloc(sizeof(type))

/**
 * Allocate an array of elements of one data type. Does type-checking.
 */
#define malloc_array_p(type, count) (type *)realloc_array(NULL, sizeof(type), count, false)

/** 
 * Resize an array of elements of one data type. Does type-checking.
 */
#define realloc_p(p, type, count) (type *)realloc_array(p, sizeof(type), count, false)

/** 
 * zero a structure 
 */
#ifndef ZERO_STRUCT
#define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
#endif

/** 
 * zero a structure given a pointer to the structure 
 */
#ifndef ZERO_STRUCTP
#define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
#endif

/** 
 * zero a structure given a pointer to the structure - no zero check 
 */
#ifndef ZERO_STRUCTPN
#define ZERO_STRUCTPN(x) memset((char *)(x), 0, sizeof(*(x)))
#endif

/* zero an array - note that sizeof(array) must work - ie. it must not be a
   pointer */
#ifndef ZERO_ARRAY
#define ZERO_ARRAY(x) memset((char *)(x), 0, sizeof(x))
#endif

/**
 * work out how many elements there are in a static array 
 */
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(a) (sizeof(a)/sizeof(a[0]))
#endif

/** 
 * pointer difference macro 
 */
#ifndef PTR_DIFF
#define PTR_DIFF(p1,p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
#endif



#endif /* _SAMBA_MEMORY_H_ */