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/* safe-alloc.c: safer memory allocation
Copyright (C) 2009-2017 Free Software Foundation, Inc.
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 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 <https://www.gnu.org/licenses/>. */
/* Written by Daniel Berrange <berrange@redhat.com>, 2008 */
#include <config.h>
/* Specification. */
#include "safe-alloc.h"
#include "xalloc-oversized.h"
#include <stdlib.h>
#include <stddef.h>
#include <errno.h>
/**
* safe_alloc_alloc_n:
* @ptrptr: pointer to pointer for address of allocated memory
* @size: number of bytes to allocate
* @count: number of elements to allocate
*
* Allocate an array of memory 'count' elements long,
* each with 'size' bytes. Return the address of the
* allocated memory in 'ptrptr'. The newly allocated
* memory is filled with zeros.
*
* Return -1 on failure to allocate, zero on success
*/
int
safe_alloc_alloc_n (void *ptrptr, size_t size, size_t count, int zeroed)
{
if (size == 0 || count == 0)
{
*(void **) ptrptr = NULL;
return 0;
}
if (xalloc_oversized (count, size))
{
errno = ENOMEM;
return -1;
}
if (zeroed)
*(void **) ptrptr = calloc (count, size);
else
*(void **) ptrptr = malloc (count * size);
if (*(void **) ptrptr == NULL)
return -1;
return 0;
}
/**
* safe_alloc_realloc_n:
* @ptrptr: pointer to pointer for address of allocated memory
* @size: number of bytes to allocate
* @count: number of elements in array
*
* Resize the block of memory in 'ptrptr' to be an array of
* 'count' elements, each 'size' bytes in length. Update 'ptrptr'
* with the address of the newly allocated memory. On failure,
* 'ptrptr' is not changed and still points to the original memory
* block. The newly allocated memory is filled with zeros.
*
* Return -1 on failure to allocate, zero on success
*/
int
safe_alloc_realloc_n (void *ptrptr, size_t size, size_t count)
{
void *tmp;
if (size == 0 || count == 0)
{
free (*(void **) ptrptr);
*(void **) ptrptr = NULL;
return 0;
}
if (xalloc_oversized (count, size))
{
errno = ENOMEM;
return -1;
}
tmp = realloc (*(void **) ptrptr, size * count);
if (!tmp)
return -1;
*(void **) ptrptr = tmp;
return 0;
}
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