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105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/* safe-alloc.c: safer memory allocation
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Copyright (C) 2009-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3 of the License, or any
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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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/* Written by Daniel Berrange <berrange@redhat.com>, 2008 */
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#include <config.h>
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/* Specification. */
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#include "safe-alloc.h"
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#include "xalloc-oversized.h"
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#include <stdlib.h>
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#include <stddef.h>
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#include <errno.h>
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/**
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* safe_alloc_alloc_n:
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* @ptrptr: pointer to pointer for address of allocated memory
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* @size: number of bytes to allocate
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* @count: number of elements to allocate
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*
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* Allocate an array of memory 'count' elements long,
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* each with 'size' bytes. Return the address of the
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* allocated memory in 'ptrptr'. The newly allocated
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* memory is filled with zeros.
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*
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* Return -1 on failure to allocate, zero on success
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*/
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int
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safe_alloc_alloc_n (void *ptrptr, size_t size, size_t count, int zeroed)
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{
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if (size == 0 || count == 0)
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{
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*(void **) ptrptr = NULL;
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return 0;
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}
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if (xalloc_oversized (count, size))
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{
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errno = ENOMEM;
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return -1;
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}
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if (zeroed)
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*(void **) ptrptr = calloc (count, size);
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else
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*(void **) ptrptr = malloc (count * size);
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if (*(void **) ptrptr == NULL)
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return -1;
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return 0;
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}
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/**
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* safe_alloc_realloc_n:
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* @ptrptr: pointer to pointer for address of allocated memory
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* @size: number of bytes to allocate
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* @count: number of elements in array
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*
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* Resize the block of memory in 'ptrptr' to be an array of
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* 'count' elements, each 'size' bytes in length. Update 'ptrptr'
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* with the address of the newly allocated memory. On failure,
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* 'ptrptr' is not changed and still points to the original memory
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* block. The newly allocated memory is filled with zeros.
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*
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* Return -1 on failure to allocate, zero on success
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*/
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int
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safe_alloc_realloc_n (void *ptrptr, size_t size, size_t count)
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{
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void *tmp;
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if (size == 0 || count == 0)
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{
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free (*(void **) ptrptr);
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*(void **) ptrptr = NULL;
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return 0;
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}
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if (xalloc_oversized (count, size))
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{
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errno = ENOMEM;
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return -1;
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}
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tmp = realloc (*(void **) ptrptr, size * count);
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if (!tmp)
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return -1;
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*(void **) ptrptr = tmp;
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return 0;
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}
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