source: branches/2.2.2/mindi-busybox/libbb/simplify_path.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.6 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * bb_simplify_path implementation for busybox
4 *
5 * Copyright (C) 2001  Manuel Novoa III  <mjn3@codepoet.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23#include <stdlib.h>
24#include "libbb.h"
25
26char *bb_simplify_path(const char *path)
27{
28    char *s, *start, *p;
29
30    if (path[0] == '/')
31        start = bb_xstrdup(path);
32    else {
33        s = xgetcwd(NULL);
34        start = concat_path_file(s, path);
35        free(s);
36    }
37    p = s = start;
38
39    do {
40        if (*p == '/') {
41            if (*s == '/') {    /* skip duplicate (or initial) slash */
42                continue;
43            } else if (*s == '.') {
44                if (s[1] == '/' || s[1] == 0) { /* remove extra '.' */
45                    continue;
46                } else if ((s[1] == '.') && (s[2] == '/' || s[2] == 0)) {
47                    ++s;
48                    if (p > start) {
49                        while (*--p != '/');    /* omit previous dir */
50                    }
51                    continue;
52                }
53            }
54        }
55        *++p = *s;
56    } while (*++s);
57
58    if ((p == start) || (*p != '/')) {  /* not a trailing slash */
59        ++p;                    /* so keep last character */
60    }
61    *p = 0;
62
63    return start;
64}
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