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/* Copyright (C) 2001-2005 by Hans Reiser, licensing governed by
reiser4progs/COPYING.
place.c -- reiser4 tree place functions. Place contains full information
about position in the tree. The instance of structure reiser4_place_t
contains pointer to node item/unit lies in. */
#include <reiser4/libreiser4.h>
bool_t reiser4_place_valid(reiser4_place_t *place) {
aal_assert("umka-2367", place != NULL);
aal_assert("umka-2368", place->node != NULL);
return place->pos.item < reiser4_node_items(place->node);
}
/* Makes passed @place pointing to the first unit of the first item */
errno_t reiser4_place_first(reiser4_place_t *place) {
place->pos.item = 0;
if (place->pos.unit != MAX_UINT32)
place->pos.unit = 0;
return 0;
}
/* Makes passed @place pointing to the last unit of the last item */
errno_t reiser4_place_last(reiser4_place_t *place) {
uint32_t items = reiser4_node_items(place->node);
place->pos.item = items - 1;
if (place->pos.unit != MAX_UINT32) {
if (reiser4_place_fetch(place))
return -EINVAL;
place->pos.unit = reiser4_item_units(place) - 1;
}
return 0;
}
/* Returns TRUE if passed @place points to unit that lies after the first unit
of the first item in node. */
bool_t reiser4_place_gtfirst(reiser4_place_t *place) {
if (place->pos.unit == MAX_UINT32)
return place->pos.item > 0;
return place->pos.item > 0 || place->pos.unit > 0;
}
/* Returns TRUE if passed @place points to unit that lies before the last units
of the last item in node. */
bool_t reiser4_place_ltlast(reiser4_place_t *place) {
uint32_t items = reiser4_node_items(place->node);
if (place->pos.unit == MAX_UINT32) {
return (place->pos.item < items - 1);
} else {
uint32_t units;
if (reiser4_place_fetch(place))
return 0;
units = reiser4_item_units(place);
return (place->pos.item < items - 1 ||
place->pos.unit < units - 1);
}
}
#ifndef ENABLE_MINIMAL
/* Returns TRUE if passed @place points to leftmost item/unit */
bool_t reiser4_place_leftmost(reiser4_place_t *place) {
aal_assert("umka-1862", place != NULL);
return ((place->pos.unit == 0 || place->pos.unit == MAX_UINT32) &&
place->pos.item == 0);
}
#endif
/* Returns TRUE if @place sits after the last unit of last item in the node. */
bool_t reiser4_place_rightmost(reiser4_place_t *place) {
uint32_t items;
uint32_t units;
aal_assert("umka-1873", place != NULL);
items = reiser4_node_items(place->node);
if (place->pos.item == items)
return 1;
if (reiser4_place_fetch(place))
return 0;
units = reiser4_item_units(place);
return (place->pos.item == items - 1 &&
place->pos.unit == units);
}
/* Returns TRUE for non-existent unit of existent item. */
bool_t reiser4_place_right(reiser4_place_t *place) {
uint32_t items;
uint32_t units;
aal_assert("vpf-1292", place != NULL);
items = reiser4_node_items(place->node);
if (place->pos.item >= items ||
place->pos.unit == MAX_UINT32)
{
return 0;
}
if (reiser4_place_fetch(place))
return 0;
units = reiser4_item_units(place);
return place->pos.unit >= units;
}
void reiser4_place_inc(reiser4_place_t *place, int whole) {
uint32_t unit;
uint32_t units;
aal_assert("umka-2361", place != NULL);
aal_assert("umka-2364", place->node != NULL);
unit = whole ? MAX_UINT32 : 0;
if (place->pos.unit == MAX_UINT32)
place->pos.unit = unit;
if (reiser4_place_fetch(place))
return;
units = reiser4_item_units(place);
if (place->pos.unit >= units - 1) {
place->pos.item++;
place->pos.unit = unit;
} else
place->pos.unit++;
}
#ifndef ENABLE_MINIMAL
void reiser4_place_dec(reiser4_place_t *place, int whole) {
aal_assert("umka-2362", place != NULL);
aal_assert("umka-2365", place->node != NULL);
if (place->pos.unit == 0 ||
place->pos.unit == MAX_UINT32)
{
uint32_t units;
aal_assert("umka-2404",
place->pos.item > 0);
place->pos.item--;
if (reiser4_place_fetch(place))
return;
units = reiser4_item_units(place);
place->pos.unit = units - 1;
} else
place->pos.unit--;
if (whole && place->pos.unit == 0)
place->pos.unit = MAX_UINT32;
}
#endif
/* Initializes all item-related fields */
errno_t reiser4_place_fetch(reiser4_place_t *place) {
aal_assert("umka-1459", place != NULL);
return objcall(place->node, fetch, &place->pos, place);
}
/* This function initializes passed @place by specified params */
errno_t reiser4_place_init(reiser4_place_t *place,
reiser4_node_t *node, pos_t *pos)
{
aal_assert("umka-795", place != NULL);
place->node = node;
if (pos != NULL)
place->pos = *pos;
return 0;
}
errno_t reiser4_place_assign(reiser4_place_t *place,
reiser4_node_t *node,
uint32_t item, uint32_t unit)
{
pos_t pos = {item, unit};
aal_assert("umka-1730", place != NULL);
return reiser4_place_init(place, node, &pos);
}
/* Initializes @place and its item related fields */
errno_t reiser4_place_open(reiser4_place_t *place,
reiser4_node_t *node, pos_t *pos)
{
errno_t res;
aal_assert("umka-1435", place != NULL);
if ((res = reiser4_place_init(place, node, pos)))
return res;
return reiser4_place_fetch(place);
}
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