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.
12 * # readlink --version
13 * readlink (GNU coreutils) 6.10
16 * canonicalize by following every symlink in
17 * every component of the given name recursively;
18 * all but the last component must exist
19 * -e, --canonicalize-existing
20 * canonicalize by following every symlink in
21 * every component of the given name recursively,
22 * all components must exist
23 * -m, --canonicalize-missing
24 * canonicalize by following every symlink in
25 * every component of the given name recursively,
26 * without requirements on components existence
27 * -n, --no-newline do not output the trailing newline
28 * -q, --quiet, -s, --silent suppress most error messages
29 * -v, --verbose report error messages
31 * bbox supports: -f -n -v (fully), -q -s (accepts but ignores)
34 int readlink_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
35 int readlink_main(int argc UNUSED_PARAM, char **argv)
40 IF_FEATURE_READLINK_FOLLOW(
42 /* We need exactly one non-option argument. */
43 opt_complementary = "=1";
44 opt = getopt32(argv, "fnvsq");
47 IF_NOT_FEATURE_READLINK_FOLLOW(
48 const unsigned opt = 0;
49 if (argc != 2) bb_show_usage();
53 /* compat: coreutils readlink reports errors silently via exit code */
54 if (!(opt & 4)) /* not -v */
55 logmode = LOGMODE_NONE;
57 if (opt & 1) { /* -f */
58 buf = xmalloc_realpath(fname);
60 buf = xmalloc_readlink_or_warn(fname);
65 printf((opt & 2) ? "%s" : "%s\n", buf);
67 if (ENABLE_FEATURE_CLEAN_UP)
70 fflush_stdout_and_exit(EXIT_SUCCESS);