File: realpath.cc

package info (click to toggle)
fastdep 0.16-7
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 596 kB
  • ctags: 323
  • sloc: cpp: 2,144; ansic: 814; sh: 208; makefile: 124
file content (185 lines) | stat: -rw-r--r-- 4,451 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
#ifdef WIN32
#include <direct.h>
#include "os.h"
/*
 * realpath.c -- canonicalize pathname by removing symlinks
 * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Library Public License for more details.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <sys/types.h>
//#include <unistd.h>
#include <stdio.h>
#include <string.h>
//#include <strings.h>
#include <limits.h>				/* for PATH_MAX */
//#include <sys/param.h>			/* for MAXPATHLEN */
#include <errno.h>

#include <sys/stat.h>			/* for S_IFLNK */

#ifndef PATH_MAX
#ifdef _POSIX_VERSION
#define PATH_MAX _POSIX_PATH_MAX
#else
#ifdef MAXPATHLEN
#define PATH_MAX MAXPATHLEN
#else
#define PATH_MAX 1024
#endif
#endif
#endif

#define MAX_READLINKS 32

#if defined __STDC__ || defined WIN32
char *realpath(const char *path, char resolved_path[])
#else
char *realpath(path, resolved_path)
const char *path;
char resolved_path[];
#endif
{
	strcpy(resolved_path,path);
	return resolved_path;

	// until fixed
	char copy_path[PATH_MAX];
	char link_path[PATH_MAX];
	char got_path[PATH_MAX];
	char *new_path = got_path;
	char *max_path;
	int readlinks = 0;
	int n;

	/* Make a copy of the source path since we may need to modify it. */
	if (strlen(path) >= PATH_MAX - 2) {
#ifdef WIN32
		errno = ENOENT ;
#else
		__set_errno(ENAMETOOLONG);
#endif
		return NULL;
	}
	strcpy(copy_path, path);
	path = copy_path;
	max_path = copy_path + PATH_MAX - 2;
	/* If it's a relative pathname use getwd for starters. */
	if (*path != cPathSep) {
		/* Ohoo... */
#define HAVE_GETCWD
#ifdef HAVE_GETCWD
#ifdef WIN32
		_getcwd(new_path, PATH_MAX - 1);
#else
		getcwd(new_path, PATH_MAX - 1);
#endif
#else
		getwd(new_path);
#endif
		new_path += strlen(new_path);
		if (new_path[-1] != cPathSep)
			*new_path++ = cPathSep;
	} else {
		*new_path++ = cPathSep;
		path++;
	}
	/* Expand each slash-separated pathname component. */
	while (*path != '\0') {
		/* Ignore stray "/". */
		if (*path == cPathSep) {
			path++;
			continue;
		}
		if (*path == '.') {
			/* Ignore ".". */
			if (path[1] == '\0' || path[1] == cPathSep) {
				path++;
				continue;
			}
			if (path[1] == '.') {
				if (path[2] == '\0' || path[2] == cPathSep) {
					path += 2;
					/* Ignore ".." at root. */
					if (new_path == got_path + 1)
						continue;
					/* Handle ".." by backing up. */
					while ((--new_path)[-1] != cPathSep);
					continue;
				}
			}
		}
		/* Safely copy the next pathname component. */
		while (*path != '\0' && *path != cPathSep) {
			if (path > max_path) {
#ifdef WIN32
				errno = ENOENT ;
#else
				__set_errno(ENAMETOOLONG);
#endif				//__set_errno(ENAMETOOLONG);
				return NULL;
			}
			*new_path++ = *path++;
		}
#ifdef S_IFLNK
		/* Protect against infinite loops. */
		if (readlinks++ > MAX_READLINKS) {
			__set_errno(ELOOP);
			return NULL;
		}
		/* See if latest pathname component is a symlink. */
		*new_path = '\0';
		n = readlink(got_path, link_path, PATH_MAX - 1);
		if (n < 0) {
			/* EINVAL means the file exists but isn't a symlink. */
			if (errno != EINVAL) {
				/* Make sure it's null terminated. */
				*new_path = '\0';
				strcpy(resolved_path, got_path);
				return NULL;
			}
		} else {
			/* Note: readlink doesn't add the null byte. */
			link_path[n] = '\0';
			if (*link_path == cPathSep)
				/* Start over for an absolute symlink. */
				new_path = got_path;
			else
				/* Otherwise back up over this component. */
				while (*(--new_path) != cPathSep);
			/* Safe sex check. */
			if (strlen(path) + n >= PATH_MAX - 2) {
				__set_errno(ENAMETOOLONG);
				return NULL;
			}
			/* Insert symlink contents into path. */
			strcat(link_path, path);
			strcpy(copy_path, link_path);
			path = copy_path;
		}
#endif							/* S_IFLNK */
		*new_path++ = cPathSep;
	}
	/* Delete trailing slash but don't whomp a lone slash. */
	if (new_path != got_path + 1 && new_path[-1] == cPathSep)
		new_path--;
	/* Make sure it's null terminated. */
	*new_path = '\0';
	strcpy(resolved_path, got_path);
	return resolved_path;
}

#endif