1 /* vi: set sw=4 ts=4: */
3 * Mini readlink implementation for busybox
5 * Copyright (C) 2000,2001 Matt Kraai <kraai@alumni.carnegiemellon.edu>
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
10 //usage:#define readlink_trivial_usage
11 //usage: IF_FEATURE_READLINK_FOLLOW("[-fnv] ") "FILE"
12 //usage:#define readlink_full_usage "\n\n"
13 //usage: "Display the value of a symlink"
14 //usage: IF_FEATURE_READLINK_FOLLOW( "\n"
16 //usage: "\n -f Canonicalize by following all symlinks"
17 //usage: "\n -n Don't add newline"
18 //usage: "\n -v Verbose"
24 * # readlink --version
25 * readlink (GNU coreutils) 6.10
28 * canonicalize by following every symlink in
29 * every component of the given name recursively;
30 * all but the last component must exist
31 * -e, --canonicalize-existing
32 * canonicalize by following every symlink in
33 * every component of the given name recursively,
34 * all components must exist
35 * -m, --canonicalize-missing
36 * canonicalize by following every symlink in
37 * every component of the given name recursively,
38 * without requirements on components existence
39 * -n, --no-newline do not output the trailing newline
40 * -q, --quiet, -s, --silent suppress most error messages
41 * -v, --verbose report error messages
43 * bbox supports: -f -n -v (fully), -q -s (accepts but ignores)
46 int readlink_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
47 int readlink_main(int argc UNUSED_PARAM, char **argv)
52 IF_FEATURE_READLINK_FOLLOW(
54 /* We need exactly one non-option argument. */
55 opt_complementary = "=1";
56 opt = getopt32(argv, "fnvsq");
59 IF_NOT_FEATURE_READLINK_FOLLOW(
60 const unsigned opt = 0;
61 if (argc != 2) bb_show_usage();
65 /* compat: coreutils readlink reports errors silently via exit code */
66 if (!(opt & 4)) /* not -v */
67 logmode = LOGMODE_NONE;
69 if (opt & 1) { /* -f */
70 buf = xmalloc_realpath(fname);
72 buf = xmalloc_readlink_or_warn(fname);
77 printf((opt & 2) ? "%s" : "%s\n", buf);
79 if (ENABLE_FEATURE_CLEAN_UP)
82 fflush_stdout_and_exit(EXIT_SUCCESS);