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/**
* Helper functions for libseccomp
*
* Copyright (c) 2017 Red Hat <pmoore@redhat.com>
* Author: Paul Moore <paul@paul-moore.com>
*/
/*
* This library is free software; you can redistribute it and/or modify it
* under the terms of version 2.1 of the GNU Lesser General Public License as
* published by the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses>.
*/
#include <stdlib.h>
#include <string.h>
#include "helper.h"
/**
* Allocate memory
* @param size the size of the buffer to allocate
*
* This function allocates a buffer of the given size, initializes it to zero,
* and returns a pointer to buffer on success. NULL is returned on failure.
*
*/
void *zmalloc(size_t size)
{
/* NOTE: unlike malloc() zero size allocations always return NULL */
if (size == 0)
return NULL;
return calloc(1, size);
}
/**
* Change the size of an allocated buffer
* @param ptr pointer to the allocated buffer. If NULL it is equivalent to zmalloc.
* @param old_size the current size of the allocated buffer
* @param size the new size of the buffer
*
* This function changes the size of an allocated memory buffer and return a pointer
* to the buffer on success, the new buffer portion is initialized to zero. NULL is
* returned on failure. The returned buffer could be different than the specified
* ptr param.
*
*/
void *zrealloc(void *ptr, size_t old_size, size_t size)
{
/* NOTE: unlike malloc() zero size allocations always return NULL */
if (size == 0)
return NULL;
ptr = realloc(ptr, size);
if (!ptr)
return NULL;
memset(ptr + old_size, 0, size - old_size);
return ptr;
}
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