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) 1988 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) 1999 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 * compath(pathname)
33*7c478bd9Sstevel@tonic-gate *
34*7c478bd9Sstevel@tonic-gate * This compresses pathnames. All strings of multiple slashes are
35*7c478bd9Sstevel@tonic-gate * changed to a single slash. All occurrences of "./" are removed.
36*7c478bd9Sstevel@tonic-gate * Whenever possible, strings of "/.." are removed together with
37*7c478bd9Sstevel@tonic-gate * the directory names that they follow.
38*7c478bd9Sstevel@tonic-gate *
39*7c478bd9Sstevel@tonic-gate * WARNING: since pathname is altered by this function, it should
40*7c478bd9Sstevel@tonic-gate * be located in a temporary buffer. This avoids the problem
41*7c478bd9Sstevel@tonic-gate * of accidently changing strings obtained from makefiles
42*7c478bd9Sstevel@tonic-gate * and stored in global structures.
43*7c478bd9Sstevel@tonic-gate */
44*7c478bd9Sstevel@tonic-gate
45*7c478bd9Sstevel@tonic-gate #include <string.h>
46*7c478bd9Sstevel@tonic-gate
47*7c478bd9Sstevel@tonic-gate char *
compath(char * pathname)48*7c478bd9Sstevel@tonic-gate compath(char *pathname)
49*7c478bd9Sstevel@tonic-gate {
50*7c478bd9Sstevel@tonic-gate char *nextchar;
51*7c478bd9Sstevel@tonic-gate char *lastchar;
52*7c478bd9Sstevel@tonic-gate char *sofar;
53*7c478bd9Sstevel@tonic-gate char *pnend;
54*7c478bd9Sstevel@tonic-gate
55*7c478bd9Sstevel@tonic-gate int pnlen;
56*7c478bd9Sstevel@tonic-gate
57*7c478bd9Sstevel@tonic-gate /*
58*7c478bd9Sstevel@tonic-gate * do not change the path if it has no "/"
59*7c478bd9Sstevel@tonic-gate */
60*7c478bd9Sstevel@tonic-gate
61*7c478bd9Sstevel@tonic-gate if (strchr(pathname, '/') == 0)
62*7c478bd9Sstevel@tonic-gate return (pathname);
63*7c478bd9Sstevel@tonic-gate
64*7c478bd9Sstevel@tonic-gate /*
65*7c478bd9Sstevel@tonic-gate * find all strings consisting of more than one '/'
66*7c478bd9Sstevel@tonic-gate */
67*7c478bd9Sstevel@tonic-gate
68*7c478bd9Sstevel@tonic-gate for (lastchar = pathname + 1; *lastchar != '\0'; lastchar++)
69*7c478bd9Sstevel@tonic-gate if ((*lastchar == '/') && (*(lastchar - 1) == '/')) {
70*7c478bd9Sstevel@tonic-gate
71*7c478bd9Sstevel@tonic-gate /*
72*7c478bd9Sstevel@tonic-gate * find the character after the last slash
73*7c478bd9Sstevel@tonic-gate */
74*7c478bd9Sstevel@tonic-gate
75*7c478bd9Sstevel@tonic-gate nextchar = lastchar;
76*7c478bd9Sstevel@tonic-gate while (*++lastchar == '/') {
77*7c478bd9Sstevel@tonic-gate }
78*7c478bd9Sstevel@tonic-gate
79*7c478bd9Sstevel@tonic-gate /*
80*7c478bd9Sstevel@tonic-gate * eliminate the extra slashes by copying
81*7c478bd9Sstevel@tonic-gate * everything after the slashes over the slashes
82*7c478bd9Sstevel@tonic-gate */
83*7c478bd9Sstevel@tonic-gate
84*7c478bd9Sstevel@tonic-gate sofar = nextchar;
85*7c478bd9Sstevel@tonic-gate while ((*nextchar++ = *lastchar++) != '\0')
86*7c478bd9Sstevel@tonic-gate ;
87*7c478bd9Sstevel@tonic-gate lastchar = sofar;
88*7c478bd9Sstevel@tonic-gate }
89*7c478bd9Sstevel@tonic-gate
90*7c478bd9Sstevel@tonic-gate /*
91*7c478bd9Sstevel@tonic-gate * find all strings of "./"
92*7c478bd9Sstevel@tonic-gate */
93*7c478bd9Sstevel@tonic-gate
94*7c478bd9Sstevel@tonic-gate for (lastchar = pathname + 1; *lastchar != '\0'; lastchar++)
95*7c478bd9Sstevel@tonic-gate if ((*lastchar == '/') && (*(lastchar - 1) == '.') &&
96*7c478bd9Sstevel@tonic-gate ((lastchar - 1 == pathname) || (*(lastchar - 2) == '/'))) {
97*7c478bd9Sstevel@tonic-gate
98*7c478bd9Sstevel@tonic-gate /*
99*7c478bd9Sstevel@tonic-gate * copy everything after the "./" over the "./"
100*7c478bd9Sstevel@tonic-gate */
101*7c478bd9Sstevel@tonic-gate
102*7c478bd9Sstevel@tonic-gate nextchar = lastchar - 1;
103*7c478bd9Sstevel@tonic-gate sofar = nextchar;
104*7c478bd9Sstevel@tonic-gate while ((*nextchar++ = *++lastchar) != '\0')
105*7c478bd9Sstevel@tonic-gate ;
106*7c478bd9Sstevel@tonic-gate lastchar = sofar;
107*7c478bd9Sstevel@tonic-gate }
108*7c478bd9Sstevel@tonic-gate
109*7c478bd9Sstevel@tonic-gate /*
110*7c478bd9Sstevel@tonic-gate * find each occurrence of "/.."
111*7c478bd9Sstevel@tonic-gate */
112*7c478bd9Sstevel@tonic-gate
113*7c478bd9Sstevel@tonic-gate for (lastchar = pathname + 1; *lastchar != '\0'; lastchar++)
114*7c478bd9Sstevel@tonic-gate if ((lastchar != pathname) && (*lastchar == '/') &&
115*7c478bd9Sstevel@tonic-gate (*(lastchar + 1) == '.') && (*(lastchar + 2) == '.') &&
116*7c478bd9Sstevel@tonic-gate ((*(lastchar + 3) == '/') || (*(lastchar + 3) == '\0'))) {
117*7c478bd9Sstevel@tonic-gate
118*7c478bd9Sstevel@tonic-gate /*
119*7c478bd9Sstevel@tonic-gate * find the directory name preceding the "/.."
120*7c478bd9Sstevel@tonic-gate */
121*7c478bd9Sstevel@tonic-gate
122*7c478bd9Sstevel@tonic-gate nextchar = lastchar - 1;
123*7c478bd9Sstevel@tonic-gate while ((nextchar != pathname) &&
124*7c478bd9Sstevel@tonic-gate (*(nextchar - 1) != '/'))
125*7c478bd9Sstevel@tonic-gate --nextchar;
126*7c478bd9Sstevel@tonic-gate
127*7c478bd9Sstevel@tonic-gate /*
128*7c478bd9Sstevel@tonic-gate * make sure the preceding directory's name
129*7c478bd9Sstevel@tonic-gate * is not "." or ".."
130*7c478bd9Sstevel@tonic-gate */
131*7c478bd9Sstevel@tonic-gate
132*7c478bd9Sstevel@tonic-gate if ((*nextchar == '.') &&
133*7c478bd9Sstevel@tonic-gate (*(nextchar + 1) == '/') ||
134*7c478bd9Sstevel@tonic-gate ((*(nextchar + 1) == '.') &&
135*7c478bd9Sstevel@tonic-gate (*(nextchar + 2) == '/'))) {
136*7c478bd9Sstevel@tonic-gate /* EMPTY */;
137*7c478bd9Sstevel@tonic-gate } else {
138*7c478bd9Sstevel@tonic-gate
139*7c478bd9Sstevel@tonic-gate /*
140*7c478bd9Sstevel@tonic-gate * prepare to eliminate either
141*7c478bd9Sstevel@tonic-gate * "dir_name/../" or "dir_name/.."
142*7c478bd9Sstevel@tonic-gate */
143*7c478bd9Sstevel@tonic-gate
144*7c478bd9Sstevel@tonic-gate if (*(lastchar + 3) == '/')
145*7c478bd9Sstevel@tonic-gate lastchar += 4;
146*7c478bd9Sstevel@tonic-gate else
147*7c478bd9Sstevel@tonic-gate lastchar += 3;
148*7c478bd9Sstevel@tonic-gate
149*7c478bd9Sstevel@tonic-gate /*
150*7c478bd9Sstevel@tonic-gate * copy everything after the "/.." to
151*7c478bd9Sstevel@tonic-gate * before the preceding directory name
152*7c478bd9Sstevel@tonic-gate */
153*7c478bd9Sstevel@tonic-gate
154*7c478bd9Sstevel@tonic-gate sofar = nextchar - 1;
155*7c478bd9Sstevel@tonic-gate while ((*nextchar++ = *lastchar++) != '\0');
156*7c478bd9Sstevel@tonic-gate
157*7c478bd9Sstevel@tonic-gate lastchar = sofar;
158*7c478bd9Sstevel@tonic-gate
159*7c478bd9Sstevel@tonic-gate /*
160*7c478bd9Sstevel@tonic-gate * if the character before what was taken
161*7c478bd9Sstevel@tonic-gate * out is '/', set up to check if the
162*7c478bd9Sstevel@tonic-gate * slash is part of "/.."
163*7c478bd9Sstevel@tonic-gate */
164*7c478bd9Sstevel@tonic-gate
165*7c478bd9Sstevel@tonic-gate if ((sofar + 1 != pathname) && (*sofar == '/'))
166*7c478bd9Sstevel@tonic-gate --lastchar;
167*7c478bd9Sstevel@tonic-gate }
168*7c478bd9Sstevel@tonic-gate }
169*7c478bd9Sstevel@tonic-gate
170*7c478bd9Sstevel@tonic-gate /*
171*7c478bd9Sstevel@tonic-gate * if the string is more than a character long and ends
172*7c478bd9Sstevel@tonic-gate * in '/', eliminate the '/'.
173*7c478bd9Sstevel@tonic-gate */
174*7c478bd9Sstevel@tonic-gate
175*7c478bd9Sstevel@tonic-gate pnlen = strlen(pathname);
176*7c478bd9Sstevel@tonic-gate pnend = strchr(pathname, '\0') - 1;
177*7c478bd9Sstevel@tonic-gate
178*7c478bd9Sstevel@tonic-gate if ((pnlen > 1) && (*pnend == '/')) {
179*7c478bd9Sstevel@tonic-gate *pnend-- = '\0';
180*7c478bd9Sstevel@tonic-gate pnlen--;
181*7c478bd9Sstevel@tonic-gate }
182*7c478bd9Sstevel@tonic-gate
183*7c478bd9Sstevel@tonic-gate /*
184*7c478bd9Sstevel@tonic-gate * if the string has more than two characters and ends in
185*7c478bd9Sstevel@tonic-gate * "/.", remove the "/.".
186*7c478bd9Sstevel@tonic-gate */
187*7c478bd9Sstevel@tonic-gate
188*7c478bd9Sstevel@tonic-gate if ((pnlen > 2) && (*(pnend - 1) == '/') && (*pnend == '.'))
189*7c478bd9Sstevel@tonic-gate *--pnend = '\0';
190*7c478bd9Sstevel@tonic-gate
191*7c478bd9Sstevel@tonic-gate /*
192*7c478bd9Sstevel@tonic-gate * if all characters were deleted, return ".";
193*7c478bd9Sstevel@tonic-gate * otherwise return pathname
194*7c478bd9Sstevel@tonic-gate */
195*7c478bd9Sstevel@tonic-gate
196*7c478bd9Sstevel@tonic-gate if (*pathname == '\0')
197*7c478bd9Sstevel@tonic-gate (void) strcpy(pathname, ".");
198*7c478bd9Sstevel@tonic-gate
199*7c478bd9Sstevel@tonic-gate return (pathname);
200*7c478bd9Sstevel@tonic-gate }
201