source: branches/3.2/mindi-busybox/coreutils/readlink.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 6 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 2.3 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini readlink implementation for busybox
4 *
5 * Copyright (C) 2000,2001 Matt Kraai <kraai@alumni.carnegiemellon.edu>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
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"
15//usage:     "\n    -f  Canonicalize by following all symlinks"
16//usage:     "\n    -n  Don't add newline"
17//usage:     "\n    -v  Verbose"
18//usage:    )
19
20#include "libbb.h"
21
22/*
23 * # readlink --version
24 * readlink (GNU coreutils) 6.10
25 * # readlink --help
26 *   -f, --canonicalize
27 *      canonicalize by following every symlink in
28 *      every component of the given name recursively;
29 *      all but the last component must exist
30 *   -e, --canonicalize-existing
31 *      canonicalize by following every symlink in
32 *      every component of the given name recursively,
33 *      all components must exist
34 *   -m, --canonicalize-missing
35 *      canonicalize by following every symlink in
36 *      every component of the given name recursively,
37 *      without requirements on components existence
38 *   -n, --no-newline              do not output the trailing newline
39 *   -q, --quiet, -s, --silent     suppress most error messages
40 *   -v, --verbose                 report error messages
41 *
42 * bbox supports: -f -n -v (fully), -q -s (accepts but ignores)
43 */
44
45int readlink_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
46int readlink_main(int argc UNUSED_PARAM, char **argv)
47{
48    char *buf;
49    char *fname;
50
51    IF_FEATURE_READLINK_FOLLOW(
52        unsigned opt;
53        /* We need exactly one non-option argument.  */
54        opt_complementary = "=1";
55        opt = getopt32(argv, "fnvsq");
56        fname = argv[optind];
57    )
58    IF_NOT_FEATURE_READLINK_FOLLOW(
59        const unsigned opt = 0;
60        if (argc != 2) bb_show_usage();
61        fname = argv[1];
62    )
63
64    /* compat: coreutils readlink reports errors silently via exit code */
65    if (!(opt & 4)) /* not -v */
66        logmode = LOGMODE_NONE;
67
68    if (opt & 1) { /* -f */
69        buf = xmalloc_realpath(fname);
70    } else {
71        buf = xmalloc_readlink_or_warn(fname);
72    }
73
74    if (!buf)
75        return EXIT_FAILURE;
76    printf((opt & 2) ? "%s" : "%s\n", buf);
77
78    if (ENABLE_FEATURE_CLEAN_UP)
79        free(buf);
80
81    fflush_stdout_and_exit(EXIT_SUCCESS);
82}
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