xref: /illumos-gate/usr/src/cmd/mail/legal.c (revision 2a8bcb4efb45d99ac41c94a75c396b362c414f7f)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
23*7c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
24*7c478bd9Sstevel@tonic-gate 
25*7c478bd9Sstevel@tonic-gate 
26*7c478bd9Sstevel@tonic-gate /*
27*7c478bd9Sstevel@tonic-gate  *      Copyright (c) 2001 by Sun Microsystems, Inc.
28*7c478bd9Sstevel@tonic-gate  *      All rights reserved.
29*7c478bd9Sstevel@tonic-gate  */
30*7c478bd9Sstevel@tonic-gate 
31*7c478bd9Sstevel@tonic-gate /*
32*7c478bd9Sstevel@tonic-gate  *  NAME
33*7c478bd9Sstevel@tonic-gate  *	legal - check existence of file
34*7c478bd9Sstevel@tonic-gate  *
35*7c478bd9Sstevel@tonic-gate  *  SYNOPSIS
36*7c478bd9Sstevel@tonic-gate  *	int legal(char *file)
37*7c478bd9Sstevel@tonic-gate  *
38*7c478bd9Sstevel@tonic-gate  *  DESCRIPTION
39*7c478bd9Sstevel@tonic-gate  *	legal() checks to see if "file" is a writable file name.
40*7c478bd9Sstevel@tonic-gate  *
41*7c478bd9Sstevel@tonic-gate  *	Returns:
42*7c478bd9Sstevel@tonic-gate  *		0	-> file or directory exists, but is unwriteable
43*7c478bd9Sstevel@tonic-gate  *		1	-> file exists writeable
44*7c478bd9Sstevel@tonic-gate  *		2	-> file does not exist, but can be created
45*7c478bd9Sstevel@tonic-gate  */
46*7c478bd9Sstevel@tonic-gate 
47*7c478bd9Sstevel@tonic-gate #include "mail.h"
48*7c478bd9Sstevel@tonic-gate int
legal(file)49*7c478bd9Sstevel@tonic-gate legal(file)
50*7c478bd9Sstevel@tonic-gate register char *file;
51*7c478bd9Sstevel@tonic-gate {
52*7c478bd9Sstevel@tonic-gate 	register char *sp;
53*7c478bd9Sstevel@tonic-gate 	char dfile[MAXFILENAME];
54*7c478bd9Sstevel@tonic-gate 
55*7c478bd9Sstevel@tonic-gate 	/*
56*7c478bd9Sstevel@tonic-gate 	 *	If file does not exist then try "." if file name has
57*7c478bd9Sstevel@tonic-gate 	 *	no "/". For file names that have a "/", try check
58*7c478bd9Sstevel@tonic-gate 	 *	for existence of previous directory.
59*7c478bd9Sstevel@tonic-gate 	 */
60*7c478bd9Sstevel@tonic-gate 	if (access(file, A_EXIST) == A_OK) {
61*7c478bd9Sstevel@tonic-gate 		if (access(file, A_WRITE) == A_OK)
62*7c478bd9Sstevel@tonic-gate 			return (1);
63*7c478bd9Sstevel@tonic-gate 		else return (0);
64*7c478bd9Sstevel@tonic-gate 	} else {
65*7c478bd9Sstevel@tonic-gate 		if ((sp = strrchr(file, '/')) == NULL) {
66*7c478bd9Sstevel@tonic-gate 			strcpy(dfile, ".");
67*7c478bd9Sstevel@tonic-gate 		} else if (sp == file) {
68*7c478bd9Sstevel@tonic-gate 			strcpy(dfile, "/");
69*7c478bd9Sstevel@tonic-gate 		} else {
70*7c478bd9Sstevel@tonic-gate 			if ((sp - file + 1) > MAXFILENAME)
71*7c478bd9Sstevel@tonic-gate 				return (0);
72*7c478bd9Sstevel@tonic-gate 			strncpy(dfile, file, sp - file);
73*7c478bd9Sstevel@tonic-gate 			dfile[sp - file] = '\0';
74*7c478bd9Sstevel@tonic-gate 		}
75*7c478bd9Sstevel@tonic-gate 		if (access(dfile, A_WRITE) == CERROR)
76*7c478bd9Sstevel@tonic-gate 			return (0);
77*7c478bd9Sstevel@tonic-gate 		return (2);
78*7c478bd9Sstevel@tonic-gate 	}
79*7c478bd9Sstevel@tonic-gate }
80