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/*
* Copyright © 2008 Chris Wilson <chris@chris-wilson.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* The Original Code is the cairo graphics library.
*
* The Initial Developer of the Original Code is Chris Wilson.
*
* Contributor(s):
* Chris Wilson <chris@chris-wilson.co.uk>
*/
#include "config.h"
#include "cairo-script-private.h"
#include <limits.h> /* INT_MAX */
#include <string.h>
csi_status_t
_csi_stack_init (csi_t *ctx, csi_stack_t *stack, csi_integer_t size)
{
csi_status_t status = CSI_STATUS_SUCCESS;
stack->len = 0;
stack->size = size;
/* assert ((unsigned) size < INT_MAX / sizeof (csi_object_t)); */
stack->objects = _csi_alloc (ctx, size * sizeof (csi_object_t));
if (_csi_unlikely (stack->objects == NULL))
status = _csi_error (CSI_STATUS_NO_MEMORY);
return status;
}
void
_csi_stack_fini (csi_t *ctx, csi_stack_t *stack)
{
csi_integer_t n;
for (n = 0; n < stack->len; n++)
csi_object_free (ctx, &stack->objects[n]);
_csi_free (ctx, stack->objects);
}
csi_status_t
_csi_stack_roll (csi_t *ctx,
csi_stack_t *stack,
csi_integer_t mod, csi_integer_t n)
{
csi_object_t stack_copy[128];
csi_object_t *copy;
csi_integer_t last, i, len;
switch (mod) { /* special cases */
case 1:
last = stack->len - 1;
stack_copy[0] = stack->objects[last];
for (i = last; --n; i--)
stack->objects[i] = stack->objects[i-1];
stack->objects[i] = stack_copy[0];
return CSI_STATUS_SUCCESS;
case -1:
last = stack->len - 1;
stack_copy[0] = stack->objects[i = last - n + 1];
for (; --n; i++)
stack->objects[i] = stack->objects[i+1];
stack->objects[i] = stack_copy[0];
return CSI_STATUS_SUCCESS;
}
/* fall back to a copy */
if (n > ARRAY_LENGTH (stack_copy)) {
if (_csi_unlikely ((unsigned) n > INT_MAX / sizeof (csi_object_t)))
return _csi_error (CSI_STATUS_NO_MEMORY);
copy = _csi_alloc (ctx, n * sizeof (csi_object_t));
if (copy == NULL)
return _csi_error (CSI_STATUS_NO_MEMORY);
} else
copy = stack_copy;
i = stack->len - n;
memcpy (copy, stack->objects + i, n * sizeof (csi_object_t));
mod = -mod;
if (mod < 0)
mod += n;
last = mod;
for (len = n; n--; i++) {
stack->objects[i] = copy[last];
if (++last == len)
last = 0;
}
if (copy != stack_copy)
_csi_free (ctx, copy);
return CSI_STATUS_SUCCESS;
}
csi_status_t
_csi_stack_grow (csi_t *ctx, csi_stack_t *stack, csi_integer_t cnt)
{
csi_integer_t newsize;
csi_object_t *newstack;
if (_csi_likely (cnt <= stack->size))
return CSI_STATUS_SUCCESS;
if (_csi_unlikely ((unsigned) cnt >= INT_MAX / sizeof (csi_object_t)))
return _csi_error (CSI_STATUS_NO_MEMORY);
newsize = stack->size;
do {
newsize *= 2;
} while (newsize <= cnt);
newstack = _csi_realloc (ctx,
stack->objects,
newsize * sizeof (csi_object_t));
if (_csi_unlikely (newstack == NULL))
return _csi_error (CSI_STATUS_NO_MEMORY);
stack->objects = newstack;
stack->size = newsize;
return CSI_STATUS_SUCCESS;
}
csi_status_t
_csi_stack_push_internal (csi_t *ctx, csi_stack_t *stack,
const csi_object_t *obj)
{
csi_status_t status;
status = _csi_stack_grow (ctx, stack, stack->size + 1);
if (_csi_unlikely (status))
return status;
stack->objects[stack->len++] = *obj;
return CSI_STATUS_SUCCESS;
}
csi_object_t *
_csi_stack_peek (csi_stack_t *stack, csi_integer_t i)
{
if (_csi_unlikely (stack->len < i))
return NULL;
return &stack->objects[stack->len - i -1];
}
void
_csi_stack_pop (csi_t *ctx, csi_stack_t *stack, csi_integer_t count)
{
if (_csi_unlikely (stack->len < count))
count = stack->len;
while (count--)
csi_object_free (ctx, &stack->objects[--stack->len]);
}
csi_status_t
_csi_stack_exch (csi_stack_t *stack)
{
csi_object_t tmp;
csi_integer_t n;
if (_csi_unlikely (stack->len < 2))
return _csi_error (CSI_STATUS_INVALID_SCRIPT);
n = stack->len - 1;
tmp = stack->objects[n];
stack->objects[n] = stack->objects[n - 1];
stack->objects[n - 1] = tmp;
return CSI_STATUS_SUCCESS;
}
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