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/*
* safe-alloc.h: safer memory allocation
*
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* Written by Daniel Berrange <berrange@redhat.com>, 2008 */
#ifndef SAFE_ALLOC_H_
# define SAFE_ALLOC_H_
# include <stdlib.h>
#ifndef __GNUC_PREREQ
# if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
# else
# define __GNUC_PREREQ(maj, min) 0
# endif
#endif
# ifndef ATTRIBUTE_RETURN_CHECK
# if __GNUC_PREREQ (3, 4)
# define ATTRIBUTE_RETURN_CHECK __attribute__((__warn_unused_result__))
# else
# define ATTRIBUTE_RETURN_CHECK
# endif
# endif
/* Don't call these directly - use the macros below */
int
safe_alloc_alloc_n (void *ptrptr, size_t size, size_t count, int zeroed)
ATTRIBUTE_RETURN_CHECK;
int
safe_alloc_realloc_n (void *ptrptr, size_t size, size_t count)
ATTRIBUTE_RETURN_CHECK;
/**
* ALLOC:
* @ptr: pointer to hold address of allocated memory
*
* Allocate sizeof(*ptr) bytes of memory and store
* the address of allocated memory in 'ptr'. Fill the
* newly allocated memory with zeros.
*
* Return -1 on failure to allocate, zero on success
*/
# define ALLOC(ptr) \
safe_alloc_alloc_n (&(ptr), sizeof(*(ptr)), 1, 1)
/**
* ALLOC_N:
* @ptr: pointer to hold address of allocated memory
* @count: number of elements to allocate
*
* Allocate an array of 'count' elements, each sizeof(*ptr)
* bytes long and store the address of allocated memory in
* 'ptr'. Fill the newly allocated memory with zeros.
*
* Return -1 on failure, 0 on success
*/
# define ALLOC_N(ptr, count) \
safe_alloc_alloc_n (&(ptr), sizeof(*(ptr)), (count), 1)
/**
* ALLOC_N_UNINITIALIZED:
* @ptr: pointer to hold address of allocated memory
* @count: number of elements to allocate
*
* Allocate an array of 'count' elements, each sizeof(*ptr)
* bytes long and store the address of allocated memory in
* 'ptr'. Do not initialize the new memory at all.
*
* Return -1 on failure to allocate, zero on success
*/
# define ALLOC_N_UNINITIALIZED(ptr, count) \
safe_alloc_alloc_n (&(ptr), sizeof(*(ptr)), (count), 0)
/**
* REALLOC_N:
* @ptr: pointer to hold address of allocated memory
* @count: number of elements to allocate
*
* Re-allocate an array of 'count' elements, each sizeof(*ptr)
* bytes long and store the address of allocated memory in
* 'ptr'. Fill the newly allocated memory with zeros
*
* Return -1 on failure to reallocate, zero on success
*/
# define REALLOC_N(ptr, count) \
safe_alloc_realloc_n (&(ptr), sizeof(*(ptr)), (count))
/**
* FREE:
* @ptr: pointer holding address to be freed
*
* Free the memory stored in 'ptr' and update to point
* to NULL.
*/
# define FREE(ptr) \
do \
{ \
free (ptr); \
(ptr) = NULL; \
} \
while(0)
#endif /* SAFE_ALLOC_H_ */
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