[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini ln implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * This program is free software; you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation; either version 2 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * This program is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 15 | * General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 20 | *
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| 21 | */
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| 22 |
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| 23 | /* BB_AUDIT SUSv3 compliant */
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| 24 | /* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
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| 25 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
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| 26 |
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| 27 | #include <stdio.h>
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| 28 | #include <stdlib.h>
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| 29 | #include <unistd.h>
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| 30 | #include <errno.h>
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| 31 | #include "busybox.h"
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| 32 |
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| 33 | #define LN_SYMLINK 1
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| 34 | #define LN_FORCE 2
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| 35 | #define LN_NODEREFERENCE 4
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| 36 | #define LN_BACKUP 8
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| 37 | #define LN_SUFFIX 16
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| 38 |
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| 39 | int ln_main(int argc, char **argv)
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| 40 | {
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| 41 | int status = EXIT_SUCCESS;
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| 42 | int flag;
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| 43 | char *last;
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| 44 | char *src_name;
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| 45 | char *src;
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| 46 | char *suffix = "~";
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| 47 | struct stat statbuf;
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| 48 | int (*link_func)(const char *, const char *);
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| 49 |
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| 50 | flag = bb_getopt_ulflags(argc, argv, "sfnbS:", &suffix);
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| 51 |
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| 52 | if (argc == optind) {
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| 53 | bb_show_usage();
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| 54 | }
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| 55 |
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| 56 | last = argv[argc - 1];
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| 57 | argv += optind;
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| 58 |
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| 59 | if (argc == optind + 1) {
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| 60 | *--argv = last;
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| 61 | last = bb_get_last_path_component(bb_xstrdup(last));
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| 62 | }
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| 63 |
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| 64 | do {
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| 65 | src_name = NULL;
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| 66 | src = last;
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| 67 |
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| 68 | if (is_directory(src,
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| 69 | (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
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| 70 | NULL)) {
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| 71 | src_name = bb_xstrdup(*argv);
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| 72 | src = concat_path_file(src, bb_get_last_path_component(src_name));
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| 73 | free(src_name);
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| 74 | src_name = src;
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| 75 | }
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| 76 | if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
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| 77 | bb_perror_msg("%s", *argv);
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| 78 | status = EXIT_FAILURE;
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| 79 | free(src_name);
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| 80 | continue;
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| 81 | }
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| 82 |
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| 83 | if (flag & LN_BACKUP) {
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| 84 | char *backup;
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| 85 | backup = bb_xasprintf("%s%s", src, suffix);
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| 86 | if (rename(src, backup) < 0 && errno != ENOENT) {
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| 87 | bb_perror_msg("%s", src);
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| 88 | status = EXIT_FAILURE;
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| 89 | free(backup);
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| 90 | continue;
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| 91 | }
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| 92 | free(backup);
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| 93 | /*
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| 94 | * When the source and dest are both hard links to the same
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| 95 | * inode, a rename may succeed even though nothing happened.
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| 96 | * Therefore, always unlink().
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| 97 | */
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| 98 | unlink(src);
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| 99 | } else if (flag & LN_FORCE) {
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| 100 | unlink(src);
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| 101 | }
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| 102 |
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| 103 | link_func = link;
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| 104 | if (flag & LN_SYMLINK) {
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| 105 | link_func = symlink;
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| 106 | }
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| 107 |
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| 108 | if (link_func(*argv, src) != 0) {
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| 109 | bb_perror_msg("%s", src);
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| 110 | status = EXIT_FAILURE;
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| 111 | }
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| 112 |
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| 113 | free(src_name);
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| 114 |
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| 115 | } while ((++argv)[1]);
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| 116 |
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| 117 | return status;
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| 118 | }
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