/*
 * 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 1998 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */


/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

/*
 * mailx -- a modified version of a University of California at Berkeley
 *      mail program
 *
 * Local routines that are installation dependent.
 */

#include "rcv.h"

static  int ismailbox(char *file);

/*
 * Locate the user's mailbox file (ie, the place where new, unread
 * mail is queued).  In SVr4 UNIX, it is in /var/mail/name.
 * In preSVr4 UNIX, it is in either /usr/mail/name or /usr/spool/mail/name.
 */
void
findmail(char *name)
{
        register char *cp;

        if (name != NOSTR) {
                copy(name, copy(maildir, mailname));
                issysmbox = 1;  /* it's a system mailbox */
        } else if ((cp = getenv("MAIL")) != NULL) {
                /* if $MAIL is set, use it */
                nstrcpy(mailname, PATHSIZE, cp);
                issysmbox = ismailbox(mailname);
                /* XXX - should warn that there's no locking? */
        } else {
                copy(myname, copy(maildir, mailname));
                issysmbox = 1;
        }
        if (issysmbox)
                lockname = strrchr(mailname, '/') + 1;
}

/*
 * Make sure file matches (/usr|/var)(/spool)?/mail/.
 * If is does, it's a "system mailbox", return true.
 */
static int
ismailbox(char *file)
{
#ifdef preSVr4
        return (strncmp(file, maildir, strlen(maildir)) == 0);
#else
        if (strncmp(file, "/var", 4) != 0
            && strncmp(file, "/usr", 4) != 0
            )
                return (0);
        file += 4;
        if (strncmp(file, "/spool", 6) == 0)
                file += 6;
        return (strncmp(file, "/mail/", 6) == 0);
#endif
}