| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini readlink implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2000,2001 Matt Kraai <kraai@alumni.carnegiemellon.edu>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 | #include "libbb.h"
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| 10 |
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| 11 | /*
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| 12 | * # readlink --version
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| 13 | * readlink (GNU coreutils) 6.10
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| 14 | * # readlink --help
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| 15 | * -f, --canonicalize
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| 16 | * canonicalize by following every symlink in
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| 17 | * every component of the given name recursively;
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| 18 | * all but the last component must exist
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| 19 | * -e, --canonicalize-existing
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| 20 | * canonicalize by following every symlink in
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| 21 | * every component of the given name recursively,
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| 22 | * all components must exist
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| 23 | * -m, --canonicalize-missing
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| 24 | * canonicalize by following every symlink in
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| 25 | * every component of the given name recursively,
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| 26 | * without requirements on components existence
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| 27 | * -n, --no-newline do not output the trailing newline
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| 28 | * -q, --quiet, -s, --silent suppress most error messages
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| 29 | * -v, --verbose report error messages
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| 30 | *
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| 31 | * bbox supports: -f -n -v (fully), -q -s (accepts but ignores)
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| 32 | */
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| 33 |
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| 34 | int readlink_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 35 | int readlink_main(int argc UNUSED_PARAM, char **argv)
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| 36 | {
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| 37 | char *buf;
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| 38 | char *fname;
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| 39 |
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| 40 | IF_FEATURE_READLINK_FOLLOW(
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| 41 | unsigned opt;
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| 42 | /* We need exactly one non-option argument. */
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| 43 | opt_complementary = "=1";
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| 44 | opt = getopt32(argv, "fnvsq");
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| 45 | fname = argv[optind];
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| 46 | )
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| 47 | IF_NOT_FEATURE_READLINK_FOLLOW(
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| 48 | const unsigned opt = 0;
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| 49 | if (argc != 2) bb_show_usage();
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| 50 | fname = argv[1];
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| 51 | )
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| 52 |
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| 53 | /* compat: coreutils readlink reports errors silently via exit code */
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| 54 | if (!(opt & 4)) /* not -v */
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| 55 | logmode = LOGMODE_NONE;
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| 56 |
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| 57 | if (opt & 1) { /* -f */
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| 58 | buf = xmalloc_realpath(fname);
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| 59 | } else {
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| 60 | buf = xmalloc_readlink_or_warn(fname);
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| 61 | }
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| 62 |
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| 63 | if (!buf)
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| 64 | return EXIT_FAILURE;
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| 65 | printf((opt & 2) ? "%s" : "%s\n", buf);
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| 66 |
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| 67 | if (ENABLE_FEATURE_CLEAN_UP)
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| 68 | free(buf);
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| 69 |
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| 70 | fflush_stdout_and_exit(EXIT_SUCCESS);
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| 71 | }
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