1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate */
22*0Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */
23*0Sstevel@tonic-gate /* All Rights Reserved */
24*0Sstevel@tonic-gate
25*0Sstevel@tonic-gate
26*0Sstevel@tonic-gate /*
27*0Sstevel@tonic-gate * Copyright (c) 1999 by Sun Microsystems, Inc.
28*0Sstevel@tonic-gate * All rights reserved.
29*0Sstevel@tonic-gate */
30*0Sstevel@tonic-gate
31*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
32*0Sstevel@tonic-gate
33*0Sstevel@tonic-gate /*
34*0Sstevel@tonic-gate * compath(pathname)
35*0Sstevel@tonic-gate *
36*0Sstevel@tonic-gate * This compresses pathnames. All strings of multiple slashes are
37*0Sstevel@tonic-gate * changed to a single slash. All occurrences of "./" are removed.
38*0Sstevel@tonic-gate * Whenever possible, strings of "/.." are removed together with
39*0Sstevel@tonic-gate * the directory names that they follow.
40*0Sstevel@tonic-gate *
41*0Sstevel@tonic-gate * WARNING: since pathname is altered by this function, it should
42*0Sstevel@tonic-gate * be located in a temporary buffer. This avoids the problem
43*0Sstevel@tonic-gate * of accidently changing strings obtained from makefiles
44*0Sstevel@tonic-gate * and stored in global structures.
45*0Sstevel@tonic-gate */
46*0Sstevel@tonic-gate
47*0Sstevel@tonic-gate #include <string.h>
48*0Sstevel@tonic-gate
49*0Sstevel@tonic-gate char *
compath(char * pathname)50*0Sstevel@tonic-gate compath(char *pathname)
51*0Sstevel@tonic-gate {
52*0Sstevel@tonic-gate char *nextchar;
53*0Sstevel@tonic-gate char *lastchar;
54*0Sstevel@tonic-gate char *sofar;
55*0Sstevel@tonic-gate char *pnend;
56*0Sstevel@tonic-gate
57*0Sstevel@tonic-gate int pnlen;
58*0Sstevel@tonic-gate
59*0Sstevel@tonic-gate /*
60*0Sstevel@tonic-gate * do not change the path if it has no "/"
61*0Sstevel@tonic-gate */
62*0Sstevel@tonic-gate
63*0Sstevel@tonic-gate if (strchr(pathname, '/') == 0)
64*0Sstevel@tonic-gate return (pathname);
65*0Sstevel@tonic-gate
66*0Sstevel@tonic-gate /*
67*0Sstevel@tonic-gate * find all strings consisting of more than one '/'
68*0Sstevel@tonic-gate */
69*0Sstevel@tonic-gate
70*0Sstevel@tonic-gate for (lastchar = pathname + 1; *lastchar != '\0'; lastchar++)
71*0Sstevel@tonic-gate if ((*lastchar == '/') && (*(lastchar - 1) == '/')) {
72*0Sstevel@tonic-gate
73*0Sstevel@tonic-gate /*
74*0Sstevel@tonic-gate * find the character after the last slash
75*0Sstevel@tonic-gate */
76*0Sstevel@tonic-gate
77*0Sstevel@tonic-gate nextchar = lastchar;
78*0Sstevel@tonic-gate while (*++lastchar == '/') {
79*0Sstevel@tonic-gate }
80*0Sstevel@tonic-gate
81*0Sstevel@tonic-gate /*
82*0Sstevel@tonic-gate * eliminate the extra slashes by copying
83*0Sstevel@tonic-gate * everything after the slashes over the slashes
84*0Sstevel@tonic-gate */
85*0Sstevel@tonic-gate
86*0Sstevel@tonic-gate sofar = nextchar;
87*0Sstevel@tonic-gate while ((*nextchar++ = *lastchar++) != '\0')
88*0Sstevel@tonic-gate ;
89*0Sstevel@tonic-gate lastchar = sofar;
90*0Sstevel@tonic-gate }
91*0Sstevel@tonic-gate
92*0Sstevel@tonic-gate /*
93*0Sstevel@tonic-gate * find all strings of "./"
94*0Sstevel@tonic-gate */
95*0Sstevel@tonic-gate
96*0Sstevel@tonic-gate for (lastchar = pathname + 1; *lastchar != '\0'; lastchar++)
97*0Sstevel@tonic-gate if ((*lastchar == '/') && (*(lastchar - 1) == '.') &&
98*0Sstevel@tonic-gate ((lastchar - 1 == pathname) || (*(lastchar - 2) == '/'))) {
99*0Sstevel@tonic-gate
100*0Sstevel@tonic-gate /*
101*0Sstevel@tonic-gate * copy everything after the "./" over the "./"
102*0Sstevel@tonic-gate */
103*0Sstevel@tonic-gate
104*0Sstevel@tonic-gate nextchar = lastchar - 1;
105*0Sstevel@tonic-gate sofar = nextchar;
106*0Sstevel@tonic-gate while ((*nextchar++ = *++lastchar) != '\0')
107*0Sstevel@tonic-gate ;
108*0Sstevel@tonic-gate lastchar = sofar;
109*0Sstevel@tonic-gate }
110*0Sstevel@tonic-gate
111*0Sstevel@tonic-gate /*
112*0Sstevel@tonic-gate * find each occurrence of "/.."
113*0Sstevel@tonic-gate */
114*0Sstevel@tonic-gate
115*0Sstevel@tonic-gate for (lastchar = pathname + 1; *lastchar != '\0'; lastchar++)
116*0Sstevel@tonic-gate if ((lastchar != pathname) && (*lastchar == '/') &&
117*0Sstevel@tonic-gate (*(lastchar + 1) == '.') && (*(lastchar + 2) == '.') &&
118*0Sstevel@tonic-gate ((*(lastchar + 3) == '/') || (*(lastchar + 3) == '\0'))) {
119*0Sstevel@tonic-gate
120*0Sstevel@tonic-gate /*
121*0Sstevel@tonic-gate * find the directory name preceding the "/.."
122*0Sstevel@tonic-gate */
123*0Sstevel@tonic-gate
124*0Sstevel@tonic-gate nextchar = lastchar - 1;
125*0Sstevel@tonic-gate while ((nextchar != pathname) &&
126*0Sstevel@tonic-gate (*(nextchar - 1) != '/'))
127*0Sstevel@tonic-gate --nextchar;
128*0Sstevel@tonic-gate
129*0Sstevel@tonic-gate /*
130*0Sstevel@tonic-gate * make sure the preceding directory's name
131*0Sstevel@tonic-gate * is not "." or ".."
132*0Sstevel@tonic-gate */
133*0Sstevel@tonic-gate
134*0Sstevel@tonic-gate if ((*nextchar == '.') &&
135*0Sstevel@tonic-gate (*(nextchar + 1) == '/') ||
136*0Sstevel@tonic-gate ((*(nextchar + 1) == '.') &&
137*0Sstevel@tonic-gate (*(nextchar + 2) == '/'))) {
138*0Sstevel@tonic-gate /* EMPTY */;
139*0Sstevel@tonic-gate } else {
140*0Sstevel@tonic-gate
141*0Sstevel@tonic-gate /*
142*0Sstevel@tonic-gate * prepare to eliminate either
143*0Sstevel@tonic-gate * "dir_name/../" or "dir_name/.."
144*0Sstevel@tonic-gate */
145*0Sstevel@tonic-gate
146*0Sstevel@tonic-gate if (*(lastchar + 3) == '/')
147*0Sstevel@tonic-gate lastchar += 4;
148*0Sstevel@tonic-gate else
149*0Sstevel@tonic-gate lastchar += 3;
150*0Sstevel@tonic-gate
151*0Sstevel@tonic-gate /*
152*0Sstevel@tonic-gate * copy everything after the "/.." to
153*0Sstevel@tonic-gate * before the preceding directory name
154*0Sstevel@tonic-gate */
155*0Sstevel@tonic-gate
156*0Sstevel@tonic-gate sofar = nextchar - 1;
157*0Sstevel@tonic-gate while ((*nextchar++ = *lastchar++) != '\0');
158*0Sstevel@tonic-gate
159*0Sstevel@tonic-gate lastchar = sofar;
160*0Sstevel@tonic-gate
161*0Sstevel@tonic-gate /*
162*0Sstevel@tonic-gate * if the character before what was taken
163*0Sstevel@tonic-gate * out is '/', set up to check if the
164*0Sstevel@tonic-gate * slash is part of "/.."
165*0Sstevel@tonic-gate */
166*0Sstevel@tonic-gate
167*0Sstevel@tonic-gate if ((sofar + 1 != pathname) && (*sofar == '/'))
168*0Sstevel@tonic-gate --lastchar;
169*0Sstevel@tonic-gate }
170*0Sstevel@tonic-gate }
171*0Sstevel@tonic-gate
172*0Sstevel@tonic-gate /*
173*0Sstevel@tonic-gate * if the string is more than a character long and ends
174*0Sstevel@tonic-gate * in '/', eliminate the '/'.
175*0Sstevel@tonic-gate */
176*0Sstevel@tonic-gate
177*0Sstevel@tonic-gate pnlen = strlen(pathname);
178*0Sstevel@tonic-gate pnend = strchr(pathname, '\0') - 1;
179*0Sstevel@tonic-gate
180*0Sstevel@tonic-gate if ((pnlen > 1) && (*pnend == '/')) {
181*0Sstevel@tonic-gate *pnend-- = '\0';
182*0Sstevel@tonic-gate pnlen--;
183*0Sstevel@tonic-gate }
184*0Sstevel@tonic-gate
185*0Sstevel@tonic-gate /*
186*0Sstevel@tonic-gate * if the string has more than two characters and ends in
187*0Sstevel@tonic-gate * "/.", remove the "/.".
188*0Sstevel@tonic-gate */
189*0Sstevel@tonic-gate
190*0Sstevel@tonic-gate if ((pnlen > 2) && (*(pnend - 1) == '/') && (*pnend == '.'))
191*0Sstevel@tonic-gate *--pnend = '\0';
192*0Sstevel@tonic-gate
193*0Sstevel@tonic-gate /*
194*0Sstevel@tonic-gate * if all characters were deleted, return ".";
195*0Sstevel@tonic-gate * otherwise return pathname
196*0Sstevel@tonic-gate */
197*0Sstevel@tonic-gate
198*0Sstevel@tonic-gate if (*pathname == '\0')
199*0Sstevel@tonic-gate (void) strcpy(pathname, ".");
200*0Sstevel@tonic-gate
201*0Sstevel@tonic-gate return (pathname);
202*0Sstevel@tonic-gate }
203