|
0
|
1 /* Libiberty realpath. Like realpath, but more consistent behavior.
|
|
|
2 Based on gdb_realpath from GDB.
|
|
|
3
|
|
|
4 Copyright 2003 Free Software Foundation, Inc.
|
|
|
5
|
|
|
6 This file is part of the libiberty library.
|
|
|
7
|
|
|
8 This program is free software; you can redistribute it and/or modify
|
|
|
9 it under the terms of the GNU General Public License as published by
|
|
|
10 the Free Software Foundation; either version 2 of the License, or
|
|
|
11 (at your option) any later version.
|
|
|
12
|
|
|
13 This program is distributed in the hope that it will be useful,
|
|
|
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
16 GNU General Public License for more details.
|
|
|
17
|
|
|
18 You should have received a copy of the GNU General Public License
|
|
|
19 along with this program; if not, write to the Free Software
|
|
|
20 Foundation, Inc., 51 Franklin Street - Fifth Floor,
|
|
|
21 Boston, MA 02110-1301, USA. */
|
|
|
22
|
|
|
23 /*
|
|
|
24
|
|
|
25 @deftypefn Replacement {const char*} lrealpath (const char *@var{name})
|
|
|
26
|
|
|
27 Given a pointer to a string containing a pathname, returns a canonical
|
|
|
28 version of the filename. Symlinks will be resolved, and ``.'' and ``..''
|
|
|
29 components will be simplified. The returned value will be allocated using
|
|
|
30 @code{malloc}, or @code{NULL} will be returned on a memory allocation error.
|
|
|
31
|
|
|
32 @end deftypefn
|
|
|
33
|
|
|
34 */
|
|
|
35
|
|
|
36 #include "config.h"
|
|
|
37 #include "ansidecl.h"
|
|
|
38 #include "libiberty.h"
|
|
|
39
|
|
|
40 #ifdef HAVE_LIMITS_H
|
|
|
41 #include <limits.h>
|
|
|
42 #endif
|
|
|
43 #ifdef HAVE_STDLIB_H
|
|
|
44 #include <stdlib.h>
|
|
|
45 #endif
|
|
|
46 #ifdef HAVE_UNISTD_H
|
|
|
47 #include <unistd.h>
|
|
|
48 #endif
|
|
|
49 #ifdef HAVE_STRING_H
|
|
|
50 #include <string.h>
|
|
|
51 #endif
|
|
|
52
|
|
|
53 /* On GNU libc systems the declaration is only visible with _GNU_SOURCE. */
|
|
|
54 #if defined(HAVE_CANONICALIZE_FILE_NAME) \
|
|
|
55 && defined(NEED_DECLARATION_CANONICALIZE_FILE_NAME)
|
|
|
56 extern char *canonicalize_file_name (const char *);
|
|
|
57 #endif
|
|
|
58
|
|
|
59 #if defined(HAVE_REALPATH)
|
|
|
60 # if defined (PATH_MAX)
|
|
|
61 # define REALPATH_LIMIT PATH_MAX
|
|
|
62 # else
|
|
|
63 # if defined (MAXPATHLEN)
|
|
|
64 # define REALPATH_LIMIT MAXPATHLEN
|
|
|
65 # endif
|
|
|
66 # endif
|
|
|
67 #else
|
|
|
68 /* cygwin has realpath, so it won't get here. */
|
|
|
69 # if defined (_WIN32)
|
|
|
70 # define WIN32_LEAN_AND_MEAN
|
|
|
71 # include <windows.h> /* for GetFullPathName */
|
|
|
72 # endif
|
|
|
73 #endif
|
|
|
74
|
|
|
75 char *
|
|
|
76 lrealpath (const char *filename)
|
|
|
77 {
|
|
|
78 /* Method 1: The system has a compile time upper bound on a filename
|
|
|
79 path. Use that and realpath() to canonicalize the name. This is
|
|
|
80 the most common case. Note that, if there isn't a compile time
|
|
|
81 upper bound, you want to avoid realpath() at all costs. */
|
|
|
82 #if defined(REALPATH_LIMIT)
|
|
|
83 {
|
|
|
84 char buf[REALPATH_LIMIT];
|
|
|
85 const char *rp = realpath (filename, buf);
|
|
|
86 if (rp == NULL)
|
|
|
87 rp = filename;
|
|
|
88 return strdup (rp);
|
|
|
89 }
|
|
|
90 #endif /* REALPATH_LIMIT */
|
|
|
91
|
|
|
92 /* Method 2: The host system (i.e., GNU) has the function
|
|
|
93 canonicalize_file_name() which malloc's a chunk of memory and
|
|
|
94 returns that, use that. */
|
|
|
95 #if defined(HAVE_CANONICALIZE_FILE_NAME)
|
|
|
96 {
|
|
|
97 char *rp = canonicalize_file_name (filename);
|
|
|
98 if (rp == NULL)
|
|
|
99 return strdup (filename);
|
|
|
100 else
|
|
|
101 return rp;
|
|
|
102 }
|
|
|
103 #endif
|
|
|
104
|
|
|
105 /* Method 3: Now we're getting desperate! The system doesn't have a
|
|
|
106 compile time buffer size and no alternative function. Query the
|
|
|
107 OS, using pathconf(), for the buffer limit. Care is needed
|
|
|
108 though, some systems do not limit PATH_MAX (return -1 for
|
|
|
109 pathconf()) making it impossible to pass a correctly sized buffer
|
|
|
110 to realpath() (it could always overflow). On those systems, we
|
|
|
111 skip this. */
|
|
|
112 #if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H)
|
|
|
113 {
|
|
|
114 /* Find out the max path size. */
|
|
|
115 long path_max = pathconf ("/", _PC_PATH_MAX);
|
|
|
116 if (path_max > 0)
|
|
|
117 {
|
|
|
118 /* PATH_MAX is bounded. */
|
|
|
119 char *buf, *rp, *ret;
|
|
|
120 buf = (char *) malloc (path_max);
|
|
|
121 if (buf == NULL)
|
|
|
122 return NULL;
|
|
|
123 rp = realpath (filename, buf);
|
|
|
124 ret = strdup (rp ? rp : filename);
|
|
|
125 free (buf);
|
|
|
126 return ret;
|
|
|
127 }
|
|
|
128 }
|
|
|
129 #endif
|
|
|
130
|
|
|
131 /* The MS Windows method. If we don't have realpath, we assume we
|
|
|
132 don't have symlinks and just canonicalize to a Windows absolute
|
|
|
133 path. GetFullPath converts ../ and ./ in relative paths to
|
|
|
134 absolute paths, filling in current drive if one is not given
|
|
|
135 or using the current directory of a specified drive (eg, "E:foo").
|
|
|
136 It also converts all forward slashes to back slashes. */
|
|
|
137 #if defined (_WIN32)
|
|
|
138 {
|
|
|
139 char buf[MAX_PATH];
|
|
|
140 char* basename;
|
|
|
141 DWORD len = GetFullPathName (filename, MAX_PATH, buf, &basename);
|
|
|
142 if (len == 0 || len > MAX_PATH - 1)
|
|
|
143 return strdup (filename);
|
|
|
144 else
|
|
|
145 {
|
|
|
146 /* The file system is case-preserving but case-insensitive,
|
|
|
147 Canonicalize to lowercase, using the codepage associated
|
|
|
148 with the process locale. */
|
|
|
149 CharLowerBuff (buf, len);
|
|
|
150 return strdup (buf);
|
|
|
151 }
|
|
|
152 }
|
|
|
153 #endif
|
|
|
154
|
|
|
155 /* This system is a lost cause, just duplicate the filename. */
|
|
|
156 return strdup (filename);
|
|
|
157 }
|
