CDE/cde/lib/tt/mini_isam/isbytearray.c

/*
 * CDE - Common Desktop Environment
 *
 * Copyright (c) 1993-2012, The Open Group. All rights reserved.
 *
 * These libraries and programs are free software; you can
 * redistribute them and/or modify them under the terms of the GNU
 * Lesser General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * These libraries and programs are distributed in the hope that
 * they 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 these libraries and programs; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301 USA
 */
/*%%  (c) Copyright 1993, 1994 Hewlett-Packard Company			 */
/*%%  (c) Copyright 1993, 1994 International Business Machines Corp.	 */
/*%%  (c) Copyright 1993, 1994 Sun Microsystems, Inc.			 */
/*%%  (c) Copyright 1993, 1994 Novell, Inc. 				 */
/*%%  $XConsortium: isbytearray.c /main/3 1995/10/23 11:36:32 rswiston $ 			 				 */
/*
 * Copyright (c) 1988 by Sun Microsystems, Inc.
 */

/*
 * isbytearray.c
 *
 * Description:
 *	Byte array handling functions.
 *
 */
#include <stdlib.h>

#include "isam_impl.h"


/*
 * _bytearr_getempty()
 *
 * Return an empty byte array.
 */

Bytearray 
_bytearr_getempty(void)
{
    static Bytearray	empty_bytearray = { 0, NULL};

    return (empty_bytearray);
}

/*
 * bytearray = _bytearr_new(len, data)
 *
 * Create a byte array object.
 */

Bytearray
_bytearr_new(u_short len, char *data)
{
    Bytearray		bytearray;

    bytearray.length = len;
    bytearray.data = _ismalloc(len);
    memcpy( bytearray.data,data, (int)len);
    
    return (bytearray);
}

/*
 * new = _bytearr_dup(old)
 *
 * Duplicate a byte array object.
 */

Bytearray
_bytearr_dup(Bytearray *old)
{
    return (_bytearr_new(old->length, old->data));
}

/*
 * _bytearr_free(barrray)
 *
 * Free byte array buffer, set barray to an empty byte array.
 */

void
_bytearr_free(Bytearray *barray)
{
    if (barray->data)
	free(barray->data);

    *barray = _bytearr_getempty();
}

/*
 * _bytearr_cmp(l, r)
 *
 * Compare two byte array objects. Return 0 if they are equal, non-zero if
 * they differ.
 */

int
_bytearr_cmp(Bytearray	*l, Bytearray *r)
{
    if (l->length == r->length)
	return (memcmp(l->data, r->data, (int)l->length));
    else
	return (1);			     /* not equal */
}