src/libstatgrab/vector.c

/*
 * i-scream libstatgrab
 * http://www.i-scream.org
 * Copyright (C) 2000-2004 i-scream
 * 
 * This library 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; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 *
 * $Id: vector.c,v 1.8 2004/04/07 14:36:36 ats Exp $
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>

#include "tools.h"
#include "vector.h"

void *sg_vector_resize(void *vector, vector_header *h, int count) {
        int new_count, i;

        /* Destroy any now-unused items.
         *
         * Note that there's an assumption here that making the vector smaller
         * will never fail; if it did, then we would have destroyed items here
         * but not actually got rid of the vector pointing to them before the
         * error return.) */
        if (count < h->used_count && h->destroy_fn != NULL) {
                for (i = count; i < h->used_count; i++) {
                        h->destroy_fn((void *) (vector + i * h->item_size));
                }
        }

        /* Round up the desired size to the next multiple of the block size. */
        new_count =  ((count - 1 + h->block_size) / h->block_size)
                     * h->block_size;

        /* Resize the vector if necessary. */
        if (new_count != h->alloc_count) {
                char *new_vector;

                new_vector = sg_realloc(vector, new_count * h->item_size);
                if (new_vector == NULL && new_count != 0) {
                        /* Out of memory -- free the contents of the vector. */
                        sg_vector_resize(vector, h, 0);
                        h->error = -1;
                        return vector;
                }

                vector = new_vector;
                h->alloc_count = new_count;
        }

        /* Initialise any new items. */
        if (count > h->used_count && h->init_fn != NULL) {
                for (i = h->used_count; i < count; i++) {
                        h->init_fn((void *) (vector + i * h->item_size));
                }
        }

        h->used_count = count;
        h->error = 0;
        return vector;
}

Revision:	1.9
Committed:	Wed Apr 7 14:53:40 2004 UTC (20 years, 1 month ago) by tdb
Content type:	text/plain
Branch:	MAIN
CVS Tags:	LIBSTATGRAB_0_17, LIBSTATGRAB_0_16, LIBSTATGRAB_0_15, LIBSTATGRAB_0_14, LIBSTATGRAB_0_13, LIBSTATGRAB_0_12, LIBSTATGRAB_0_11_1, LIBSTATGRAB_0_11, LIBSTATGRAB_0_10_3, LIBSTATGRAB_0_10_2, LIBSTATGRAB_0_10_1, LIBSTATGRAB_0_10, HEAD
Changes since 1.8:	+3 -3 lines
Log Message:	Whitespace tidyup - change spaces to tabs.
#	User	Rev	Content
1	ats	1.1	/*
2	tdb	1.6	* i-scream libstatgrab
3	ats	1.1	* http://www.i-scream.org
4			* Copyright (C) 2000-2004 i-scream
5			*
6			* This library is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU Lesser General Public
8			* License as published by the Free Software Foundation; either
9			* version 2.1 of the License, or (at your option) any later version.
10			*
11			* This library is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14			* Lesser General Public License for more details.
15			*
16			* You should have received a copy of the GNU Lesser General Public
17			* License along with this library; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19			* 02111-1307 USA
20			*
21	tdb	1.9	* $Id: vector.c,v 1.8 2004/04/07 14:36:36 ats Exp $
22	ats	1.1	*/
23
24			#ifdef HAVE_CONFIG_H
25			#include "config.h"
26			#endif
27
28			#include <stdlib.h>
29
30	ats	1.8	#include "tools.h"
31	ats	1.1	#include "vector.h"
32
33	ats	1.5	void sg_vector_resize(void vector, vector_header *h, int count) {
34	ats	1.1	int new_count, i;
35
36	ats	1.4	/* Destroy any now-unused items.
37	tdb	1.9	*
38	ats	1.4	* Note that there's an assumption here that making the vector smaller
39			* will never fail; if it did, then we would have destroyed items here
40			* but not actually got rid of the vector pointing to them before the
41			* error return.) */
42	ats	1.1	if (count < h->used_count && h->destroy_fn != NULL) {
43			for (i = count; i < h->used_count; i++) {
44	ats	1.3	h->destroy_fn((void ) (vector + i h->item_size));
45	ats	1.1	}
46			}
47
48			/* Round up the desired size to the next multiple of the block size. */
49			new_count = ((count - 1 + h->block_size) / h->block_size)
50	tdb	1.9	* h->block_size;
51	ats	1.1
52			/* Resize the vector if necessary. */
53			if (new_count != h->alloc_count) {
54	ats	1.2	char *new_vector;
55	ats	1.1
56	ats	1.7	new_vector = sg_realloc(vector, new_count * h->item_size);
57	ats	1.1	if (new_vector == NULL && new_count != 0) {
58			/* Out of memory -- free the contents of the vector. */
59	ats	1.5	sg_vector_resize(vector, h, 0);
60	ats	1.4	h->error = -1;
61			return vector;
62	ats	1.1	}
63
64	ats	1.3	vector = new_vector;
65	ats	1.1	h->alloc_count = new_count;
66			}
67
68			/* Initialise any new items. */
69			if (count > h->used_count && h->init_fn != NULL) {
70			for (i = h->used_count; i < count; i++) {
71	ats	1.3	h->init_fn((void ) (vector + i h->item_size));
72	ats	1.1	}
73			}
74
75			h->used_count = count;
76	ats	1.4	h->error = 0;
77	ats	1.3	return vector;
78	ats	1.1	}
79