Contents of /tags/mkinitrd-6_1_5/busybox/libbb/simplify_path.c
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Wed Aug 5 17:52:52 2009 UTC (15 years, 1 month ago) by niro
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Wed Aug 5 17:52:52 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 1033 byte(s)
tagged 'mkinitrd-6_1_5'
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 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | |
12 | char* FAST_FUNC bb_simplify_path(const char *path) |
13 | { |
14 | char *s, *start, *p; |
15 | |
16 | if (path[0] == '/') |
17 | start = xstrdup(path); |
18 | else { |
19 | s = xrealloc_getcwd_or_warn(NULL); |
20 | start = concat_path_file(s, path); |
21 | free(s); |
22 | } |
23 | p = s = start; |
24 | |
25 | do { |
26 | if (*p == '/') { |
27 | if (*s == '/') { /* skip duplicate (or initial) slash */ |
28 | continue; |
29 | } |
30 | if (*s == '.') { |
31 | if (s[1] == '/' || !s[1]) { /* remove extra '.' */ |
32 | continue; |
33 | } |
34 | if ((s[1] == '.') && (s[2] == '/' || !s[2])) { |
35 | ++s; |
36 | if (p > start) { |
37 | while (*--p != '/') /* omit previous dir */ |
38 | continue; |
39 | } |
40 | continue; |
41 | } |
42 | } |
43 | } |
44 | *++p = *s; |
45 | } while (*++s); |
46 | |
47 | if ((p == start) || (*p != '/')) { /* not a trailing slash */ |
48 | ++p; /* so keep last character */ |
49 | } |
50 | *p = 0; |
51 | |
52 | return start; |
53 | } |