/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*

 * convert long int to base 64 ascii

 * char set is [./0-9A-Za-z]

 * two's complement negatives are assumed,

 * but no assumptions are made about sign propagation on right shift

 *

 */

#include "lint.h"

#include "mtlib.h"

#include "libc.h"

#include <values.h>

#include <synch.h>

#include <thread.h>

#include <stdlib.h>

#include <sys/types.h>

#include "tsd.h"

#define	BITSPERCHAR	6 /* to hold entire character set */

#define	BITSUSED	(BITSPERBYTE * sizeof (int))

#define	NMAX		((BITSUSED + BITSPERCHAR - 1)/BITSPERCHAR)

#define	SIGN		(-(1 << (BITSUSED - BITSPERCHAR - 1)))

#define	CHARMASK	((1 << BITSPERCHAR) - 1)

#define	WORDMASK	((1 << ((NMAX - 1) * BITSPERCHAR)) - 1)

char *

l64a(long value)

{

	/* XPG4: only the lower 32 bits are used */

	int lg = (int)value;

	char *buf = tsdalloc(_T_L64A, NMAX + 1, NULL);

	char *s = buf;

	if (buf == NULL)

		return (NULL);

	while (lg != 0) {

		int c = (lg & CHARMASK) + ('0' - 2);

		if (c > '9')

			c += 'A' - '9' - 1;

		if (c > 'Z')

			c += 'a' - 'Z' - 1;

		*s++ = (char)c;

		/* fill high-order CHAR if negative */

		/* but suppress sign propagation */

		lg = ((lg < 0) ? (lg >> BITSPERCHAR) | SIGN :

		    lg >> BITSPERCHAR) & WORDMASK;

	}

	*s = '\0';

	return (buf);

}