| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini readlink implementation for busybox |
| * |
| * Copyright (C) 2000,2001 Matt Kraai <kraai@alumni.carnegiemellon.edu> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| #include "libbb.h" |
| |
| /* |
| * # readlink --version |
| * readlink (GNU coreutils) 6.10 |
| * # readlink --help |
| * -f, --canonicalize |
| * canonicalize by following every symlink in |
| * every component of the given name recursively; |
| * all but the last component must exist |
| * -e, --canonicalize-existing |
| * canonicalize by following every symlink in |
| * every component of the given name recursively, |
| * all components must exist |
| * -m, --canonicalize-missing |
| * canonicalize by following every symlink in |
| * every component of the given name recursively, |
| * without requirements on components existence |
| * -n, --no-newline do not output the trailing newline |
| * -q, --quiet, -s, --silent suppress most error messages |
| * -v, --verbose report error messages |
| * |
| * bbox supports: -f -n -v (fully), -q -s (accepts but ignores) |
| */ |
| |
| int readlink_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int readlink_main(int argc UNUSED_PARAM, char **argv) |
| { |
| char *buf; |
| char *fname; |
| |
| IF_FEATURE_READLINK_FOLLOW( |
| unsigned opt; |
| /* We need exactly one non-option argument. */ |
| opt_complementary = "=1"; |
| opt = getopt32(argv, "fnvsq"); |
| fname = argv[optind]; |
| ) |
| IF_NOT_FEATURE_READLINK_FOLLOW( |
| const unsigned opt = 0; |
| if (argc != 2) bb_show_usage(); |
| fname = argv[1]; |
| ) |
| |
| /* compat: coreutils readlink reports errors silently via exit code */ |
| if (!(opt & 4)) /* not -v */ |
| logmode = LOGMODE_NONE; |
| |
| if (opt & 1) { /* -f */ |
| buf = xmalloc_realpath(fname); |
| } else { |
| buf = xmalloc_readlink_or_warn(fname); |
| } |
| |
| if (!buf) |
| return EXIT_FAILURE; |
| printf((opt & 2) ? "%s" : "%s\n", buf); |
| |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(buf); |
| |
| fflush_stdout_and_exit(EXIT_SUCCESS); |
| } |