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/*
* Copyright (c) International Business Machines Corp., 2014
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* File: array_iter.c
* Author: Shaun Wetzstein <shaun@us.ibm.com>
* Descr: dynamic array
* Note:
* Date: 10/22/10
*/
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <malloc.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include "assert.h"
#include "misc.h"
#include "hash.h"
#include "nargs.h"
#include "array_iter.h"
/* ======================================================================= */
const char *__array_iter_msg[] = {
"array_iter: unexpected NULL pointer",
"array_iter: index out-of-range",
};
#define ARRAY_ITER_NULL (__array_iter_msg[0])
#define ARRAY_ITER_RANGE (__array_iter_msg[1])
/* ======================================================================= */
static inline const void *__array_iter_bwd(array_iter_t * self)
{
size_t low = array_low(self->array);
const void *ret = NULL;
if (low < self->idx)
self->idx--;
while (low < self->idx) {
if (array_status(self->array, self->idx))
break;
self->idx--;
}
if (low < self->idx)
ret = array_at(self->array, self->idx);
return ret;
}
static inline const void *__array_iter_fwd(array_iter_t * self)
{
size_t high = array_high(self->array);
const void *ret = NULL;
if (self->idx < high)
self->idx++;
while (self->idx < high) {
if (array_status(self->array, self->idx))
break;
self->idx++;
}
if (self->idx < high)
ret = array_at(self->array, self->idx);
return ret;
}
void array_iter_init(array_iter_t * self, array_t * array, uint32_t flags)
{
if (unlikely(self == NULL))
throw_unexpected(ARRAY_ITER_NULL);
if (unlikely(array == NULL))
throw_unexpected(ARRAY_ITER_NULL);
self->flags = flags;
self->array = array;
if (self->flags & AI_FLAG_BWD) {
self->idx = array_high(self->array);
__array_iter_bwd(self);
} else {
self->idx = array_low(self->array);
__array_iter_fwd(self);
}
}
void array_iter_clear(array_iter_t * self)
{
if (unlikely(self == NULL))
throw_unexpected(ARRAY_ITER_NULL);
if (self->flags & AI_FLAG_BWD)
self->idx = array_high(self->array);
else
self->idx = array_low(self->array);
self->array = NULL;
}
const void *array_iter_elem(array_iter_t * self)
{
if (unlikely(self == NULL))
throw_unexpected(ARRAY_ITER_NULL);
if (self->idx < array_low(self->array))
throw_unexpected(ARRAY_ITER_RANGE);
if (array_high(self->array) <= self->idx)
throw_unexpected(ARRAY_ITER_RANGE);
return array_status(self->array, self->idx) ?
array_at(self->array, self->idx) : NULL;
}
const void *array_iter_inc1(array_iter_t * self)
{
return array_iter_inc2(self, 1);
}
const void *array_iter_inc2(array_iter_t * self, size_t inc)
{
if (unlikely(self == NULL))
throw_unexpected(ARRAY_ITER_NULL);
const void *ret = NULL;
if (self->flags & AI_FLAG_BWD)
ret = __array_iter_bwd(self);
else
ret = __array_iter_fwd(self);
return ret;
}
const void *array_iter_dec1(array_iter_t * self)
{
return array_iter_dec2(self, 1);
}
const void *array_iter_dec2(array_iter_t * self, size_t dec)
{
if (unlikely(self == NULL))
throw_unexpected(ARRAY_ITER_NULL);
const void *ret = NULL;
if (self->flags & AI_FLAG_BWD)
ret = __array_iter_fwd(self);
else
ret = __array_iter_bwd(self);
return ret;
}
/* ======================================================================= */
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