/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */


/*
 *      Copyright (c) 2001 by Sun Microsystems, Inc.
 *      All rights reserved.
 */

/*
 *  NAME
 *      legal - check existence of file
 *
 *  SYNOPSIS
 *      int legal(char *file)
 *
 *  DESCRIPTION
 *      legal() checks to see if "file" is a writable file name.
 *
 *      Returns:
 *              0       -> file or directory exists, but is unwriteable
 *              1       -> file exists writeable
 *              2       -> file does not exist, but can be created
 */

#include "mail.h"
int
legal(file)
register char *file;
{
        register char *sp;
        char dfile[MAXFILENAME];

        /*
         *      If file does not exist then try "." if file name has
         *      no "/". For file names that have a "/", try check
         *      for existence of previous directory.
         */
        if (access(file, A_EXIST) == A_OK) {
                if (access(file, A_WRITE) == A_OK)
                        return (1);
                else return (0);
        } else {
                if ((sp = strrchr(file, '/')) == NULL) {
                        strcpy(dfile, ".");
                } else if (sp == file) {
                        strcpy(dfile, "/");
                } else {
                        if ((sp - file + 1) > MAXFILENAME)
                                return (0);
                        strncpy(dfile, file, sp - file);
                        dfile[sp - file] = '\0';
                }
                if (access(dfile, A_WRITE) == CERROR)
                        return (0);
                return (2);
        }
}