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/*
* Copyright (C) 2009 Citrix Ltd.
* Author Vincent Hanquez <vincent.hanquez@eu.citrix.com>
*
* This program 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; version 2.1 only. with the special
* exception on linking described in file LICENSE.
*
* 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 Lesser General Public License for more details.
*/
#include "libxl_internal.h"
#include <stdarg.h>
/*
* It is safe to store gc in the struct because:
* - If it an actual gc, then the flexarray should not be used after the gc
* have been freed.
* - If it is a NOGC, then this point to a structure embedded in libxl_ctx,
* therefore will survive across several libxl calls.
*/
flexarray_t *flexarray_make(libxl__gc *gc, int size, int autogrow)
{
flexarray_t *array;
GCNEW(array);
array->size = size;
array->autogrow = autogrow;
array->count = 0;
array->gc = gc;
GCNEW_ARRAY(array->data, size);
return array;
}
void flexarray_free(flexarray_t *array)
{
assert(!libxl__gc_is_real(array->gc));
free(array->data);
free(array);
}
void flexarray_grow(flexarray_t *array, int extents)
{
int newsize;
libxl__gc *gc = array->gc;
newsize = array->size + extents;
GCREALLOC_ARRAY(array->data, newsize);
array->size += extents;
}
int flexarray_set(flexarray_t *array, unsigned int idx, void *ptr)
{
if (idx >= array->size) {
int newsize;
if (!array->autogrow)
return 1;
newsize = (array->size * 2 < idx) ? idx + 1 : array->size * 2;
flexarray_grow(array, newsize - array->size);
}
if ( idx + 1 > array->count )
array->count = idx + 1;
array->data[idx] = ptr;
return 0;
}
int flexarray_append(flexarray_t *array, void *ptr)
{
return flexarray_set(array, array->count, ptr);
}
int flexarray_append_pair(flexarray_t *array, void *ptr1, void *ptr2)
{
int rc = flexarray_append(array, ptr1);
if (!rc)
rc = flexarray_append(array, ptr2);
return rc;
}
int flexarray_vappend(flexarray_t *array, ...)
{
va_list va;
void *ptr;
int ret;
va_start(va, array);
for(ret = 0; (ptr = va_arg(va, void *)); ret++) {
if ( flexarray_append(array, ptr) )
break;
}
va_end(va);
return ret;
}
int flexarray_get(flexarray_t *array, int idx, void **ptr)
{
if (idx >= array->size)
return 1;
*ptr = array->data[idx];
return 0;
}
void **flexarray_contents(flexarray_t *array)
{
void **data;
data = array->data;
if (!libxl__gc_is_real(array->gc))
free(array);
return data;
}
/*
* Local variables:
* mode: C
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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