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/* safe-alloc.h: safer memory allocation
Copyright (C) 2009-2021 Free Software Foundation, Inc.
This file 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 file 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 program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Daniel Berrange and Paul Eggert. */
#ifndef SAFE_ALLOC_H_
#define SAFE_ALLOC_H_
#include <stdlib.h>
#ifndef _GL_INLINE_HEADER_BEGIN
#error "Please include config.h first."
#endif
_GL_INLINE_HEADER_BEGIN
#ifndef SAFE_ALLOC_INLINE
# define SAFE_ALLOC_INLINE _GL_INLINE
#endif
/* Don't call these directly - use the macros below. */
SAFE_ALLOC_INLINE void *
safe_alloc_realloc_n (void *ptr, size_t count, size_t size)
{
if (count == 0 || size == 0)
count = size = 1;
return reallocarray (ptr, count, size);
}
_GL_ATTRIBUTE_NODISCARD SAFE_ALLOC_INLINE int
safe_alloc_check (void *ptr)
{
/* Return 0 if the allocation was successful, -1 otherwise. */
return -!ptr;
}
/**
* ALLOC:
* @ptr: pointer to 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) ALLOC_N (ptr, 1)
/**
* ALLOC_N:
* @ptr: pointer to 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_check ((ptr) = calloc (count, sizeof *(ptr)))
/**
* ALLOC_N_UNINITIALIZED:
* @ptr: pointer to 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_check ((ptr) = safe_alloc_realloc_n (NULL, count, sizeof *(ptr)))
/**
* REALLOC_N:
* @ptr: pointer to 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_check ((ptr) = safe_alloc_realloc_n (ptr, count, sizeof *(ptr)))
/**
* FREE:
* @ptr: pointer holding address to be freed
*
* Free the memory stored in 'ptr' and update to point
* to NULL.
*/
#define FREE(ptr) ((void) (free (ptr), (ptr) = NULL))
_GL_INLINE_HEADER_END
#endif /* SAFE_ALLOC_H_ */
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