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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