/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
*          Copyright (c) 2020-2023 Contributors to ksh 93u+m           *
*                      and is licensed under the                       *
*                 Eclipse Public License, Version 2.0                  *
*                                                                      *
*                A copy of the License is available at                 *
*      https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html      *
*         (with md5 checksum 84283fa8859daf213bdda5a9f8d1be1d)         *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                  Martijn Dekker <martijn@inlv.org>                   *
*                                                                      *
***********************************************************************/
/*
 * Glenn Fowler
 * AT&T Bell Laboratories
 *
 * return strperm() expression for perm
 */

#include <ast.h>
#include <ls.h>

char*
fmtperm(int perm)
{
	char*	s;
	char*		buf;

	s = buf = fmtbuf(32);

	/*
	 * u
	 */

	*s++ = 'u';
	*s++ = '=';
	if (perm & S_ISVTX)
		*s++ = 't';
	if (perm & S_ISUID)
		*s++ = 's';
	if (perm & S_IRUSR)
		*s++ = 'r';
	if (perm & S_IWUSR)
		*s++ = 'w';
	if (perm & S_IXUSR)
		*s++ = 'x';
	if ((perm & (S_ISGID|S_IXGRP)) == S_ISGID)
		*s++ = 'l';

	/*
	 * g
	 */

	*s++ = ',';
	*s++ = 'g';
	*s++ = '=';
	if ((perm & (S_ISGID|S_IXGRP)) == (S_ISGID|S_IXGRP))
		*s++ = 's';
	if (perm & S_IRGRP)
		*s++ = 'r';
	if (perm & S_IWGRP)
		*s++ = 'w';
	if (perm & S_IXGRP)
		*s++ = 'x';

	/*
	 * o
	 */

	*s++ = ',';
	*s++ = 'o';
	*s++ = '=';
	if (perm & S_IROTH)
		*s++ = 'r';
	if (perm & S_IWOTH)
		*s++ = 'w';
	if (perm & S_IXOTH)
		*s++ = 'x';
	*s = 0;
	return buf;
}
