Contents of /tags/mkinitrd-6_1_3/busybox/coreutils/cp.c
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 18:51:23 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 3007 byte(s)
tagged 'mkinitrd-6_1_3'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini cp implementation for busybox |
4 | * |
5 | * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu> |
6 | * SELinux support by Yuichi Nakamura <ynakam@hitachisoft.jp> |
7 | * |
8 | * Licensed under GPL v2 or later, see file LICENSE in this tarball for details. |
9 | */ |
10 | |
11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/cp.html */ |
12 | |
13 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) |
14 | * |
15 | * Size reduction. |
16 | */ |
17 | |
18 | #include "libbb.h" |
19 | #include "libcoreutils/coreutils.h" |
20 | |
21 | /* This is a NOEXEC applet. Be very careful! */ |
22 | |
23 | |
24 | int cp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
25 | int cp_main(int argc, char **argv) |
26 | { |
27 | struct stat source_stat; |
28 | struct stat dest_stat; |
29 | const char *last; |
30 | const char *dest; |
31 | int s_flags; |
32 | int d_flags; |
33 | int flags; |
34 | int status = 0; |
35 | enum { |
36 | OPT_a = 1 << (sizeof(FILEUTILS_CP_OPTSTR)-1), |
37 | OPT_r = 1 << (sizeof(FILEUTILS_CP_OPTSTR)), |
38 | OPT_P = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+1), |
39 | OPT_H = 1 << (sizeof(FILEUTILS_CP_OPTSTR)+2), |
40 | }; |
41 | |
42 | // Need at least two arguments |
43 | // Soft- and hardlinking doesn't mix |
44 | // -P and -d are the same (-P is POSIX, -d is GNU) |
45 | // -r and -R are the same |
46 | // -R (and therefore -r) turns on -d (coreutils does this) |
47 | // -a = -pdR |
48 | opt_complementary = "-2:l--s:s--l:Pd:rRd:Rd:apdR:HL"; |
49 | flags = getopt32(argv, FILEUTILS_CP_OPTSTR "arPH"); |
50 | argc -= optind; |
51 | argv += optind; |
52 | flags ^= FILEUTILS_DEREFERENCE; /* the sense of this flag was reversed */ |
53 | /* coreutils 6.9 compat: |
54 | * by default, "cp" derefs symlinks (creates regular dest files), |
55 | * but "cp -R" does not. We switch off deref if -r or -R (see above). |
56 | * However, "cp -RL" must still deref symlinks: */ |
57 | if (flags & FILEUTILS_DEREF_SOFTLINK) /* -L */ |
58 | flags |= FILEUTILS_DEREFERENCE; |
59 | /* The behavior of -H is *almost* like -L, but not quite, so let's |
60 | * just ignore it too for fun. TODO. |
61 | if (flags & OPT_H) ... // deref command-line params only |
62 | */ |
63 | |
64 | #if ENABLE_SELINUX |
65 | if (flags & FILEUTILS_PRESERVE_SECURITY_CONTEXT) { |
66 | selinux_or_die(); |
67 | } |
68 | #endif |
69 | |
70 | last = argv[argc - 1]; |
71 | /* If there are only two arguments and... */ |
72 | if (argc == 2) { |
73 | s_flags = cp_mv_stat2(*argv, &source_stat, |
74 | (flags & FILEUTILS_DEREFERENCE) ? stat : lstat); |
75 | if (s_flags < 0) |
76 | return EXIT_FAILURE; |
77 | d_flags = cp_mv_stat(last, &dest_stat); |
78 | if (d_flags < 0) |
79 | return EXIT_FAILURE; |
80 | |
81 | /* ...if neither is a directory or... */ |
82 | if ( !((s_flags | d_flags) & 2) || |
83 | /* ...recursing, the 1st is a directory, and the 2nd doesn't exist... */ |
84 | ((flags & FILEUTILS_RECUR) && (s_flags & 2) && !d_flags) |
85 | ) { |
86 | /* ...do a simple copy. */ |
87 | dest = last; |
88 | goto DO_COPY; /* NB: argc==2 -> *++argv==last */ |
89 | } |
90 | } |
91 | |
92 | while (1) { |
93 | dest = concat_path_file(last, bb_get_last_path_component_strip(*argv)); |
94 | DO_COPY: |
95 | if (copy_file(*argv, dest, flags) < 0) { |
96 | status = 1; |
97 | } |
98 | if (*++argv == last) { |
99 | /* possibly leaking dest... */ |
100 | break; |
101 | } |
102 | free((void*)dest); |
103 | } |
104 | |
105 | /* Exit. We are NOEXEC, not NOFORK. We do exit at the end of main() */ |
106 | return status; |
107 | } |