Contents of /tags/mkinitrd-6_5_1/busybox/libbb/simplify_path.c
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Wed Sep 7 17:51:16 2011 UTC (13 years ago) by niro
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Wed Sep 7 17:51:16 2011 UTC (13 years ago) by niro
File MIME type: text/plain
File size: 1137 byte(s)
tagged 'mkinitrd-6_5_1'
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 | #include "libbb.h" |
10 | |
11 | char* FAST_FUNC bb_simplify_abs_path_inplace(char *start) |
12 | { |
13 | char *s, *p; |
14 | |
15 | p = s = start; |
16 | do { |
17 | if (*p == '/') { |
18 | if (*s == '/') { /* skip duplicate (or initial) slash */ |
19 | continue; |
20 | } |
21 | if (*s == '.') { |
22 | if (s[1] == '/' || !s[1]) { /* remove extra '.' */ |
23 | continue; |
24 | } |
25 | if ((s[1] == '.') && (s[2] == '/' || !s[2])) { |
26 | ++s; |
27 | if (p > start) { |
28 | while (*--p != '/') /* omit previous dir */ |
29 | continue; |
30 | } |
31 | continue; |
32 | } |
33 | } |
34 | } |
35 | *++p = *s; |
36 | } while (*++s); |
37 | |
38 | if ((p == start) || (*p != '/')) { /* not a trailing slash */ |
39 | ++p; /* so keep last character */ |
40 | } |
41 | *p = '\0'; |
42 | return p; |
43 | } |
44 | |
45 | char* FAST_FUNC bb_simplify_path(const char *path) |
46 | { |
47 | char *s, *p; |
48 | |
49 | if (path[0] == '/') |
50 | s = xstrdup(path); |
51 | else { |
52 | p = xrealloc_getcwd_or_warn(NULL); |
53 | s = concat_path_file(p, path); |
54 | free(p); |
55 | } |
56 | |
57 | bb_simplify_abs_path_inplace(s); |
58 | return s; |
59 | } |