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b175462422
Using realpath() directly with a non-NULL output buffer is unsafe because its behavior is unspecified on systems which don't have PATH_MAX (ie. Hurd) I beleive this also fixes a small bug whereby 'buf' would not be freed on 'readlink -v' with ENABLE_FEATURE_CLEANUP. Signed-off-by: Jeremie Koenig <jk@jk.fr.eu.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini readlink implementation for busybox
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*
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* Copyright (C) 2000,2001 Matt Kraai <kraai@alumni.carnegiemellon.edu>
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*
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* Licensed under GPL v2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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/*
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* # readlink --version
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* readlink (GNU coreutils) 6.10
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* # readlink --help
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* -f, --canonicalize
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* canonicalize by following every symlink in
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* every component of the given name recursively;
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* all but the last component must exist
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* -e, --canonicalize-existing
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* canonicalize by following every symlink in
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* every component of the given name recursively,
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* all components must exist
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* -m, --canonicalize-missing
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* canonicalize by following every symlink in
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* every component of the given name recursively,
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* without requirements on components existence
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* -n, --no-newline do not output the trailing newline
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* -q, --quiet, -s, --silent suppress most error messages
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* -v, --verbose report error messages
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*
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* bbox supports: -f -n -v (fully), -q -s (accepts but ignores)
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*/
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int readlink_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int readlink_main(int argc UNUSED_PARAM, char **argv)
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{
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char *buf;
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char *fname;
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IF_FEATURE_READLINK_FOLLOW(
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unsigned opt;
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/* We need exactly one non-option argument. */
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opt_complementary = "=1";
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opt = getopt32(argv, "fnvsq");
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fname = argv[optind];
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)
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IF_NOT_FEATURE_READLINK_FOLLOW(
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const unsigned opt = 0;
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if (argc != 2) bb_show_usage();
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fname = argv[1];
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)
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/* compat: coreutils readlink reports errors silently via exit code */
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if (!(opt & 4)) /* not -v */
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logmode = LOGMODE_NONE;
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if (opt & 1) { /* -f */
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buf = xmalloc_realpath(fname);
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} else {
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buf = xmalloc_readlink_or_warn(fname);
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}
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if (!buf)
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return EXIT_FAILURE;
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printf((opt & 2) ? "%s" : "%s\n", buf);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(buf);
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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