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/*
* libvirt-utils.c: misc helper APIs for python binding
*
* Copyright (C) 2013 Red Hat, 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, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include "libvirt-utils.h"
/**
* virAlloc:
* @ptrptr: pointer to pointer for address of allocated memory
* @size: number of bytes to allocate
*
* Allocate 'size' bytes of memory. Return the address of the
* allocated memory in 'ptrptr'. The newly allocated memory is
* filled with zeros.
*
* Returns -1 on failure to allocate, zero on success
*/
int virAlloc(void *ptrptr,
size_t size)
{
*(void **)ptrptr = calloc(1, size);
if (*(void **)ptrptr == NULL) {
return -1;
}
return 0;
}
/**
* virAllocN:
* @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.
*
* Returns -1 on failure to allocate, zero on success
*/
int virAllocN(void *ptrptr,
size_t size,
size_t count)
{
*(void**)ptrptr = calloc(count, size);
if (*(void**)ptrptr == NULL) {
return -1;
}
return 0;
}
/**
* virReallocN:
* @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. Any newly allocated memory in 'ptrptr' is uninitialized.
*
* Returns -1 on failure to allocate, zero on success
*/
int virReallocN(void *ptrptr,
size_t size,
size_t count)
{
void *tmp;
if (xalloc_oversized(count, size)) {
errno = ENOMEM;
return -1;
}
tmp = realloc(*(void**)ptrptr, size * count);
if (!tmp && (size * count)) {
return -1;
}
*(void**)ptrptr = tmp;
return 0;
}
/**
* virFree:
* @ptrptr: pointer to pointer for address of memory to be freed
*
* Release the chunk of memory in the pointer pointed to by
* the 'ptrptr' variable. After release, 'ptrptr' will be
* updated to point to NULL.
*/
void virFree(void *ptrptr)
{
int save_errno = errno;
free(*(void**)ptrptr);
*(void**)ptrptr = NULL;
errno = save_errno;
}
int virFileClose(int *fdptr)
{
int saved_errno = 0;
int rc = 0;
saved_errno = errno;
if (*fdptr < 0)
return 0;
rc = close(*fdptr);
*fdptr = -1;
errno = saved_errno;
return rc;
}
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