YAP 7.1.0
realpath.c
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3 <title>/var/www/vhosts/netmite.com/android/mydroid/bionic/libc/bionic/realpath.c</title>
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6<pre>
7<font color="#444444">/*
8 * Copyright (c) 1994
9 * The Regents of the University of California. All rights reserved.
10 *
11 * This code is derived from software contributed to Berkeley by
12 * Jan-Simon Pendry.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 * must display the following acknowledgement:
24 * This product includes software developed by the University of
25 * California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 */</font>
42
43<font color="0000ff"><strong>#if defined(LIBC_SCCS) &amp;&amp; !defined(lint)</strong></font>
44<strong>static</strong> <strong>char</strong> <font color="#2040a0">sccsid</font><font color="4444FF">[</font><font color="4444FF">]</font> <font color="4444FF">=</font> <font color="#008000">&quot;@(#)realpath.c 8.1 (Berkeley) 2/16/94&quot;</font><font color="4444FF">;</font>
45<strong>static</strong> <strong>char</strong> <font color="#2040a0">rcsid</font><font color="4444FF">[</font><font color="4444FF">]</font> <font color="4444FF">=</font>
46<font color="#008000">&quot;$FreeBSD: /repoman/r/ncvs/src/lib/libc/stdlib/realpath.c,v 1.6.2.1 2003/08/03 23:47:39 nectar Exp $&quot;</font><font color="4444FF">;</font>
47<font color="0000ff"><strong>#endif<font color="#444444"> /* LIBC_SCCS and not lint */</font></strong></font>
48
49<font color="0000ff"><strong>#include <font color="#008000">&lt;sys/param.h&gt;</font></strong></font>
50<font color="0000ff"><strong>#include <font color="#008000">&lt;sys/stat.h&gt;</font></strong></font>
51
52<font color="0000ff"><strong>#include <font color="#008000">&lt;errno.h&gt;</font></strong></font>
53<font color="0000ff"><strong>#include <font color="#008000">&lt;fcntl.h&gt;</font></strong></font>
54<font color="0000ff"><strong>#include <font color="#008000">&lt;stdlib.h&gt;</font></strong></font>
55<font color="0000ff"><strong>#include <font color="#008000">&lt;string.h&gt;</font></strong></font>
56<font color="0000ff"><strong>#include <font color="#008000">&lt;unistd.h&gt;</font></strong></font>
57
58<font color="#444444">/*
59 * char *realpath(const char *path, char resolved_path[PATH_MAX]);
60 *
61 * Find the real name of path, by removing all &quot;.&quot;, &quot;..&quot; and symlink
62 * components. Returns (resolved) on success, or (NULL) on failure,
63 * in which case the path which caused trouble is left in (resolved).
64 */</font>
65<strong>char</strong> <font color="4444FF">*</font>
66<font color="#2040a0">realpath</font><font color="4444FF">(</font><font color="#2040a0">path</font>, <font color="#2040a0">resolved</font><font color="4444FF">)</font>
67 <strong>const</strong> <strong>char</strong> <font color="4444FF">*</font><font color="#2040a0">path</font><font color="4444FF">;</font>
68 <strong>char</strong> <font color="4444FF">*</font><font color="#2040a0">resolved</font><font color="4444FF">;</font>
69<font color="4444FF"><strong>{</strong></font>
70 <strong>struct</strong> <font color="#2040a0">stat</font> <font color="#2040a0">sb</font><font color="4444FF">;</font>
71 <strong>int</strong> <font color="#2040a0">fd</font>, <font color="#2040a0">n</font>, <font color="#2040a0">rootd</font>, <font color="#2040a0">serrno</font><font color="4444FF">;</font>
72 <strong>char</strong> <font color="4444FF">*</font><font color="#2040a0">p</font>, <font color="4444FF">*</font><font color="#2040a0">q</font>, <font color="#2040a0">wbuf</font><font color="4444FF">[</font><font color="#2040a0">PATH_MAX</font><font color="4444FF">]</font><font color="4444FF">;</font>
73 <strong>int</strong> <font color="#2040a0">symlinks</font> <font color="4444FF">=</font> <font color="#FF0000">0</font><font color="4444FF">;</font>
74
75 <font color="#444444">/* Save the starting point. */</font>
76 <strong>if</strong> <font color="4444FF">(</font><font color="4444FF">(</font><font color="#2040a0">fd</font> <font color="4444FF">=</font> <font color="#2040a0">open</font><font color="4444FF">(</font><font color="#008000">&quot;.&quot;</font>, <font color="#2040a0">O_RDONLY</font><font color="4444FF">)</font><font color="4444FF">)</font> <font color="4444FF">&lt;</font> <font color="#FF0000">0</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
77 <font color="4444FF">(</font><strong>void</strong><font color="4444FF">)</font><font color="#2040a0">strcpy</font><font color="4444FF">(</font><font color="#2040a0">resolved</font>, <font color="#008000">&quot;.&quot;</font><font color="4444FF">)</font><font color="4444FF">;</font>
78 <strong>return</strong> <font color="4444FF">(</font><font color="#2040a0">NULL</font><font color="4444FF">)</font><font color="4444FF">;</font>
79 <font color="4444FF"><strong>}</strong></font>
80
81 <font color="#444444">/*
82 * Find the dirname and basename from the path to be resolved.
83 * Change directory to the dirname component.
84 * lstat the basename part.
85 * if it is a symlink, read in the value and loop.
86 * if it is a directory, then change to that directory.
87 * get the current directory name and append the basename.
88 */</font>
89 <font color="4444FF">(</font><strong>void</strong><font color="4444FF">)</font><font color="#2040a0">strncpy</font><font color="4444FF">(</font><font color="#2040a0">resolved</font>, <font color="#2040a0">path</font>, <font color="#2040a0">PATH_MAX</font> <font color="4444FF">-</font> <font color="#FF0000">1</font><font color="4444FF">)</font><font color="4444FF">;</font>
90 <font color="#2040a0">resolved</font><font color="4444FF">[</font><font color="#2040a0">PATH_MAX</font> <font color="4444FF">-</font> <font color="#FF0000">1</font><font color="4444FF">]</font> <font color="4444FF">=</font> <font color="#008000">'<font color="#77dd77">\0</font>'</font><font color="4444FF">;</font>
91<font color="#2040a0">loop</font><font color="4444FF">:</font>
92 <font color="#2040a0">q</font> <font color="4444FF">=</font> <font color="#2040a0">strrchr</font><font color="4444FF">(</font><font color="#2040a0">resolved</font>, <font color="#008000">'/'</font><font color="4444FF">)</font><font color="4444FF">;</font>
93 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">q</font> <font color="4444FF">!</font><font color="4444FF">=</font> <font color="#2040a0">NULL</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
94 <font color="#2040a0">p</font> <font color="4444FF">=</font> <font color="#2040a0">q</font> <font color="4444FF">+</font> <font color="#FF0000">1</font><font color="4444FF">;</font>
95 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">q</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#2040a0">resolved</font><font color="4444FF">)</font>
96 <font color="#2040a0">q</font> <font color="4444FF">=</font> <font color="#008000">&quot;/&quot;</font><font color="4444FF">;</font>
97 <strong>else</strong> <font color="4444FF"><strong>{</strong></font>
98 <strong>do</strong> <font color="4444FF"><strong>{</strong></font>
99 <font color="4444FF">-</font><font color="4444FF">-</font><font color="#2040a0">q</font><font color="4444FF">;</font>
100 <font color="4444FF"><strong>}</strong></font> <strong>while</strong> <font color="4444FF">(</font><font color="#2040a0">q</font> <font color="4444FF">&gt;</font> <font color="#2040a0">resolved</font> <font color="4444FF">&amp;</font><font color="4444FF">&amp;</font> <font color="4444FF">*</font><font color="#2040a0">q</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#008000">'/'</font><font color="4444FF">)</font><font color="4444FF">;</font>
101 <font color="#2040a0">q</font><font color="4444FF">[</font><font color="#FF0000">1</font><font color="4444FF">]</font> <font color="4444FF">=</font> <font color="#008000">'<font color="#77dd77">\0</font>'</font><font color="4444FF">;</font>
102 <font color="#2040a0">q</font> <font color="4444FF">=</font> <font color="#2040a0">resolved</font><font color="4444FF">;</font>
103 <font color="4444FF"><strong>}</strong></font>
104 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">chdir</font><font color="4444FF">(</font><font color="#2040a0">q</font><font color="4444FF">)</font> <font color="4444FF">&lt;</font> <font color="#FF0000">0</font><font color="4444FF">)</font>
105 <strong>goto</strong> <font color="#2040a0">err1</font><font color="4444FF">;</font>
106 <font color="4444FF"><strong>}</strong></font> <strong>else</strong>
107 <font color="#2040a0">p</font> <font color="4444FF">=</font> <font color="#2040a0">resolved</font><font color="4444FF">;</font>
108
109 <font color="#444444">/* Deal with the last component. */</font>
110 <strong>if</strong> <font color="4444FF">(</font><font color="4444FF">*</font><font color="#2040a0">p</font> <font color="4444FF">!</font><font color="4444FF">=</font> <font color="#008000">'<font color="#77dd77">\0</font>'</font> <font color="4444FF">&amp;</font><font color="4444FF">&amp;</font> <font color="#2040a0">lstat</font><font color="4444FF">(</font><font color="#2040a0">p</font>, <font color="4444FF">&amp;</font><font color="#2040a0">sb</font><font color="4444FF">)</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#FF0000">0</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
111 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">S_ISLNK</font><font color="4444FF">(</font><font color="#2040a0">sb</font>.<font color="#2040a0">st_mode</font><font color="4444FF">)</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
112 <strong>if</strong> <font color="4444FF">(</font><font color="4444FF">+</font><font color="4444FF">+</font><font color="#2040a0">symlinks</font> <font color="4444FF">&gt;</font> <font color="#2040a0">MAXSYMLINKS</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
113 <font color="#2040a0">errno</font> <font color="4444FF">=</font> <font color="#2040a0">ELOOP</font><font color="4444FF">;</font>
114 <strong>goto</strong> <font color="#2040a0">err1</font><font color="4444FF">;</font>
115 <font color="4444FF"><strong>}</strong></font>
116 <font color="#2040a0">n</font> <font color="4444FF">=</font> <font color="#2040a0">readlink</font><font color="4444FF">(</font><font color="#2040a0">p</font>, <font color="#2040a0">resolved</font>, <font color="#2040a0">PATH_MAX</font> <font color="4444FF">-</font> <font color="#FF0000">1</font><font color="4444FF">)</font><font color="4444FF">;</font>
117 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">n</font> <font color="4444FF">&lt;</font> <font color="#FF0000">0</font><font color="4444FF">)</font>
118 <strong>goto</strong> <font color="#2040a0">err1</font><font color="4444FF">;</font>
119 <font color="#2040a0">resolved</font><font color="4444FF">[</font><font color="#2040a0">n</font><font color="4444FF">]</font> <font color="4444FF">=</font> <font color="#008000">'<font color="#77dd77">\0</font>'</font><font color="4444FF">;</font>
120 <strong>goto</strong> <font color="#2040a0">loop</font><font color="4444FF">;</font>
121 <font color="4444FF"><strong>}</strong></font>
122 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">S_ISDIR</font><font color="4444FF">(</font><font color="#2040a0">sb</font>.<font color="#2040a0">st_mode</font><font color="4444FF">)</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
123 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">chdir</font><font color="4444FF">(</font><font color="#2040a0">p</font><font color="4444FF">)</font> <font color="4444FF">&lt;</font> <font color="#FF0000">0</font><font color="4444FF">)</font>
124 <strong>goto</strong> <font color="#2040a0">err1</font><font color="4444FF">;</font>
125 <font color="#2040a0">p</font> <font color="4444FF">=</font> <font color="#008000">&quot;&quot;</font><font color="4444FF">;</font>
126 <font color="4444FF"><strong>}</strong></font>
127 <font color="4444FF"><strong>}</strong></font>
128
129 <font color="#444444">/*
130 * Save the last component name and get the full pathname of
131 * the current directory.
132 */</font>
133 <font color="4444FF">(</font><strong>void</strong><font color="4444FF">)</font><font color="#2040a0">strcpy</font><font color="4444FF">(</font><font color="#2040a0">wbuf</font>, <font color="#2040a0">p</font><font color="4444FF">)</font><font color="4444FF">;</font>
134 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">getcwd</font><font color="4444FF">(</font><font color="#2040a0">resolved</font>, <font color="#2040a0">PATH_MAX</font><font color="4444FF">)</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#FF0000">0</font><font color="4444FF">)</font>
135 <strong>goto</strong> <font color="#2040a0">err1</font><font color="4444FF">;</font>
136
137 <font color="#444444">/*
138 * Join the two strings together, ensuring that the right thing
139 * happens if the last component is empty, or the dirname is root.
140 */</font>
141 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">resolved</font><font color="4444FF">[</font><font color="#FF0000">0</font><font color="4444FF">]</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#008000">'/'</font> <font color="4444FF">&amp;</font><font color="4444FF">&amp;</font> <font color="#2040a0">resolved</font><font color="4444FF">[</font><font color="#FF0000">1</font><font color="4444FF">]</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#008000">'<font color="#77dd77">\0</font>'</font><font color="4444FF">)</font>
142 <font color="#2040a0">rootd</font> <font color="4444FF">=</font> <font color="#FF0000">1</font><font color="4444FF">;</font>
143 <strong>else</strong>
144 <font color="#2040a0">rootd</font> <font color="4444FF">=</font> <font color="#FF0000">0</font><font color="4444FF">;</font>
145
146 <strong>if</strong> <font color="4444FF">(</font><font color="4444FF">*</font><font color="#2040a0">wbuf</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
147 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">strlen</font><font color="4444FF">(</font><font color="#2040a0">resolved</font><font color="4444FF">)</font> <font color="4444FF">+</font> <font color="#2040a0">strlen</font><font color="4444FF">(</font><font color="#2040a0">wbuf</font><font color="4444FF">)</font> <font color="4444FF">+</font> <font color="4444FF">(</font><font color="#FF0000">1</font><font color="4444FF">-</font><font color="#2040a0">rootd</font><font color="4444FF">)</font> <font color="4444FF">+</font> <font color="#FF0000">1</font> <font color="4444FF">&gt;</font>
148 <font color="#2040a0">PATH_MAX</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
149 <font color="#2040a0">errno</font> <font color="4444FF">=</font> <font color="#2040a0">ENAMETOOLONG</font><font color="4444FF">;</font>
150 <strong>goto</strong> <font color="#2040a0">err1</font><font color="4444FF">;</font>
151 <font color="4444FF"><strong>}</strong></font>
152 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">rootd</font> <font color="4444FF">=</font><font color="4444FF">=</font> <font color="#FF0000">0</font><font color="4444FF">)</font>
153 <font color="4444FF">(</font><strong>void</strong><font color="4444FF">)</font><font color="#2040a0">strcat</font><font color="4444FF">(</font><font color="#2040a0">resolved</font>, <font color="#008000">&quot;/&quot;</font><font color="4444FF">)</font><font color="4444FF">;</font>
154 <font color="4444FF">(</font><strong>void</strong><font color="4444FF">)</font><font color="#2040a0">strcat</font><font color="4444FF">(</font><font color="#2040a0">resolved</font>, <font color="#2040a0">wbuf</font><font color="4444FF">)</font><font color="4444FF">;</font>
155 <font color="4444FF"><strong>}</strong></font>
156
157 <font color="#444444">/* Go back to where we came from. */</font>
158 <strong>if</strong> <font color="4444FF">(</font><font color="#2040a0">fchdir</font><font color="4444FF">(</font><font color="#2040a0">fd</font><font color="4444FF">)</font> <font color="4444FF">&lt;</font> <font color="#FF0000">0</font><font color="4444FF">)</font> <font color="4444FF"><strong>{</strong></font>
159 <font color="#2040a0">serrno</font> <font color="4444FF">=</font> <font color="#2040a0">errno</font><font color="4444FF">;</font>
160 <strong>goto</strong> <font color="#2040a0">err2</font><font color="4444FF">;</font>
161 <font color="4444FF"><strong>}</strong></font>
162
163 <font color="#444444">/* It's okay if the close fails, what's an fd more or less? */</font>
164 <font color="4444FF">(</font><strong>void</strong><font color="4444FF">)</font><font color="#2040a0">close</font><font color="4444FF">(</font><font color="#2040a0">fd</font><font color="4444FF">)</font><font color="4444FF">;</font>
165 <strong>return</strong> <font color="4444FF">(</font><font color="#2040a0">resolved</font><font color="4444FF">)</font><font color="4444FF">;</font>
166
167<font color="#2040a0">err1</font><font color="4444FF">:</font> <font color="#2040a0">serrno</font> <font color="4444FF">=</font> <font color="#2040a0">errno</font><font color="4444FF">;</font>
168 <font color="4444FF">(</font><strong>void</strong><font color="4444FF">)</font><font color="#2040a0">fchdir</font><font color="4444FF">(</font><font color="#2040a0">fd</font><font color="4444FF">)</font><font color="4444FF">;</font>
169<font color="#2040a0">err2</font><font color="4444FF">:</font> <font color="4444FF">(</font><strong>void</strong><font color="4444FF">)</font><font color="#2040a0">close</font><font color="4444FF">(</font><font color="#2040a0">fd</font><font color="4444FF">)</font><font color="4444FF">;</font>
170 <font color="#2040a0">errno</font> <font color="4444FF">=</font> <font color="#2040a0">serrno</font><font color="4444FF">;</font>
171 <strong>return</strong> <font color="4444FF">(</font><font color="#2040a0">NULL</font><font color="4444FF">)</font><font color="4444FF">;</font>
172<font color="4444FF"><strong>}</strong></font>
173
174</pre>
175<hr>
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android
@ android
read-only boolean, a machine running an Google's Android version of the Linux Operating System
Definition: YapGFlagInfo.h:78