1*5c51f124SMoriah Waterland /*
2*5c51f124SMoriah Waterland  * CDDL HEADER START
3*5c51f124SMoriah Waterland  *
4*5c51f124SMoriah Waterland  * The contents of this file are subject to the terms of the
5*5c51f124SMoriah Waterland  * Common Development and Distribution License (the "License").
6*5c51f124SMoriah Waterland  * You may not use this file except in compliance with the License.
7*5c51f124SMoriah Waterland  *
8*5c51f124SMoriah Waterland  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9*5c51f124SMoriah Waterland  * or http://www.opensolaris.org/os/licensing.
10*5c51f124SMoriah Waterland  * See the License for the specific language governing permissions
11*5c51f124SMoriah Waterland  * and limitations under the License.
12*5c51f124SMoriah Waterland  *
13*5c51f124SMoriah Waterland  * When distributing Covered Code, include this CDDL HEADER in each
14*5c51f124SMoriah Waterland  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15*5c51f124SMoriah Waterland  * If applicable, add the following below this CDDL HEADER, with the
16*5c51f124SMoriah Waterland  * fields enclosed by brackets "[]" replaced with your own identifying
17*5c51f124SMoriah Waterland  * information: Portions Copyright [yyyy] [name of copyright owner]
18*5c51f124SMoriah Waterland  *
19*5c51f124SMoriah Waterland  * CDDL HEADER END
20*5c51f124SMoriah Waterland  */
21*5c51f124SMoriah Waterland 
22*5c51f124SMoriah Waterland /*
23*5c51f124SMoriah Waterland  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
24*5c51f124SMoriah Waterland  * Use is subject to license terms.
25*5c51f124SMoriah Waterland  */
26*5c51f124SMoriah Waterland 
27*5c51f124SMoriah Waterland /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28*5c51f124SMoriah Waterland /* All Rights Reserved */
29*5c51f124SMoriah Waterland 
30*5c51f124SMoriah Waterland 
31*5c51f124SMoriah Waterland #include <string.h>
32*5c51f124SMoriah Waterland 
33*5c51f124SMoriah Waterland #define	isdot(x)	((x[0] == '.') && (!x[1] || (x[1] == '/')))
34*5c51f124SMoriah Waterland #define	isdotdot(x)	((x[0] == '.') && (x[1] == '.') && \
35*5c51f124SMoriah Waterland 			    (!x[2] || (x[2] == '/')))
36*5c51f124SMoriah Waterland 
37*5c51f124SMoriah Waterland void
canonize(char * file)38*5c51f124SMoriah Waterland canonize(char *file)
39*5c51f124SMoriah Waterland {
40*5c51f124SMoriah Waterland 	char *pt, *last;
41*5c51f124SMoriah Waterland 	int level;
42*5c51f124SMoriah Waterland 
43*5c51f124SMoriah Waterland 	/* remove references such as "./" and "../" and "//" */
44*5c51f124SMoriah Waterland 	for (pt = file; *pt; /* void */) {
45*5c51f124SMoriah Waterland 		if (isdot(pt))
46*5c51f124SMoriah Waterland 			(void) strcpy(pt, pt[1] ? pt+2 : pt+1);
47*5c51f124SMoriah Waterland 		else if (isdotdot(pt)) {
48*5c51f124SMoriah Waterland 			level = 0;
49*5c51f124SMoriah Waterland 			last = pt;
50*5c51f124SMoriah Waterland 			do {
51*5c51f124SMoriah Waterland 				level++;
52*5c51f124SMoriah Waterland 				last += 2;
53*5c51f124SMoriah Waterland 				if (*last)
54*5c51f124SMoriah Waterland 					last++;
55*5c51f124SMoriah Waterland 			} while (isdotdot(last));
56*5c51f124SMoriah Waterland 			--pt; /* point to previous '/' */
57*5c51f124SMoriah Waterland 			while (level--) {
58*5c51f124SMoriah Waterland 				if (pt <= file)
59*5c51f124SMoriah Waterland 					return;
60*5c51f124SMoriah Waterland 				while ((*--pt != '/') && (pt > file))
61*5c51f124SMoriah Waterland 					;
62*5c51f124SMoriah Waterland 			}
63*5c51f124SMoriah Waterland 			if (*pt == '/')
64*5c51f124SMoriah Waterland 				pt++;
65*5c51f124SMoriah Waterland 			(void) strcpy(pt, last);
66*5c51f124SMoriah Waterland 		} else {
67*5c51f124SMoriah Waterland 			while (*pt && (*pt != '/'))
68*5c51f124SMoriah Waterland 				pt++;
69*5c51f124SMoriah Waterland 			if (*pt == '/') {
70*5c51f124SMoriah Waterland 				while (pt[1] == '/')
71*5c51f124SMoriah Waterland 					(void) strcpy(pt, pt+1);
72*5c51f124SMoriah Waterland 				pt++;
73*5c51f124SMoriah Waterland 			}
74*5c51f124SMoriah Waterland 		}
75*5c51f124SMoriah Waterland 	}
76*5c51f124SMoriah Waterland 	if ((--pt > file) && (*pt == '/'))
77*5c51f124SMoriah Waterland 		*pt = '\0';
78*5c51f124SMoriah Waterland }
79*5c51f124SMoriah Waterland 
80*5c51f124SMoriah Waterland void
canonize_slashes(char * file)81*5c51f124SMoriah Waterland canonize_slashes(char *file)
82*5c51f124SMoriah Waterland {
83*5c51f124SMoriah Waterland 	char *pt;
84*5c51f124SMoriah Waterland 
85*5c51f124SMoriah Waterland 	/* remove references such as "//" */
86*5c51f124SMoriah Waterland 	for (pt = file; *pt; /* void */) {
87*5c51f124SMoriah Waterland 		while (*pt && (*pt != '/'))
88*5c51f124SMoriah Waterland 			pt++;
89*5c51f124SMoriah Waterland 		if (*pt == '/') {
90*5c51f124SMoriah Waterland 			while (pt[1] == '/')
91*5c51f124SMoriah Waterland 				(void) strcpy(pt, pt+1);
92*5c51f124SMoriah Waterland 			pt++;
93*5c51f124SMoriah Waterland 		}
94*5c51f124SMoriah Waterland 	}
95*5c51f124SMoriah Waterland 	if ((--pt > file) && (*pt == '/'))
96*5c51f124SMoriah Waterland 		*pt = '\0';
97*5c51f124SMoriah Waterland }
98