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b1278dc611
Wed Oct 25 19:11:03 2000 Owen Taylor <otaylor@redhat.com> * gbsearcharray.h (g_bsearch_array_get_nth): Don't use implicit casts from void * since this will get included from C++ too at times.
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/* GObject - GLib Type, Object, Parameter and Signal Library
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* Copyright (C) 2000 Tim Janik
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* gbsearcharray.h: binary searchable sorted array maintenance
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*/
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#ifndef __G_BSEARCH_ARRAY_H__
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#define __G_BSEARCH_ARRAY_H__
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#include <gobject/gtype.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* helper macro to avoid signed overflow for value comparisions */
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#define G_BSEARCH_ARRAY_CMP(v1,v2) ((v1) < (v2) ? -1 : (v1) > (v2) ? 1 : 0)
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/* --- typedefs --- */
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typedef struct _GBSearchArray GBSearchArray;
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typedef gint (*GBSearchCompareFunc) (gconstpointer bsearch_node1,
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gconstpointer bsearch_node2);
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typedef enum
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{
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G_BSEARCH_ALIGN_POWER2 = 1 << 0,
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G_BSEARCH_DEFER_SHRINK = 1 << 1
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} GBSearchFlags;
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/* --- structures --- */
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struct _GBSearchArray
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{
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GBSearchCompareFunc cmp_func;
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guint16 sizeof_node;
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guint16 flags;
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guint n_nodes;
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gpointer nodes;
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};
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/* --- prototypes --- */
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gpointer g_bsearch_array_insert (GBSearchArray *barray,
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gconstpointer key_node,
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gboolean replace_existing);
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void g_bsearch_array_remove (GBSearchArray *barray,
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gconstpointer key_node);
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void g_bsearch_array_remove_node (GBSearchArray *barray,
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gpointer node_in_array);
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G_INLINE_FUNC
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gpointer g_bsearch_array_lookup (GBSearchArray *barray,
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gconstpointer key_node);
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G_INLINE_FUNC
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gpointer g_bsearch_array_get_nth (GBSearchArray *barray,
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guint n);
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/* --- implementation details --- */
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#if defined (G_CAN_INLINE) || defined (__G_BSEARCHARRAY_C__)
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G_INLINE_FUNC gpointer
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g_bsearch_array_lookup (GBSearchArray *barray,
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gconstpointer key_node)
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{
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if (barray->n_nodes > 0)
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{
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GBSearchCompareFunc cmp_func = barray->cmp_func;
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gint sizeof_node = barray->sizeof_node;
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guint n_nodes = barray->n_nodes;
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guint8 *nodes = (guint8 *) barray->nodes;
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nodes -= sizeof_node;
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do
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{
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guint8 *check;
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guint i;
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register gint cmp;
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i = (n_nodes + 1) >> 1;
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check = nodes + i * sizeof_node;
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cmp = cmp_func (key_node, check);
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if (cmp == 0)
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return check;
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else if (cmp > 0)
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{
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n_nodes -= i;
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nodes = check;
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}
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else /* if (cmp < 0) */
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n_nodes = i - 1;
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}
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while (n_nodes);
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}
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return NULL;
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}
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G_INLINE_FUNC gpointer
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g_bsearch_array_get_nth (GBSearchArray *barray,
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guint n)
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{
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if (n < barray->n_nodes)
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{
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guint8 *nodes = (guint8 *) barray->nodes;
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return nodes + n * barray->sizeof_node;
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}
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else
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return NULL;
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}
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#endif /* G_CAN_INLINE && __G_BSEARCHARRAY_C__ */
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __G_BSEARCH_ARRAY_H__ */
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