| 1 | /*-
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| 2 | * Copyright (c) 1987, 1993, 1994
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| 3 | * The Regents of the University of California. All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 4. Neither the name of the University nor the names of its contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | #if 0
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| 31 | #ifndef lint
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| 32 | static char const copyright[] =
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| 33 | "@(#) Copyright (c) 1987, 1993, 1994\n\
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| 34 | The Regents of the University of California. All rights reserved.\n";
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| 35 | #endif /* not lint */
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| 36 |
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| 37 | #ifndef lint
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| 38 | static char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94";
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| 39 | #endif /* not lint */
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| 40 | #endif
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| 41 | #include <sys/cdefs.h>
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| 42 | __FBSDID("$FreeBSD: src/bin/ln/ln.c,v 1.33 2005/02/09 17:37:37 ru Exp $");
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| 43 |
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| 44 | #include <sys/param.h>
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| 45 | #include <sys/stat.h>
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| 46 |
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| 47 | #include <err.h>
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| 48 | #include <errno.h>
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| 49 | #include <limits.h>
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| 50 | #include <stdio.h>
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| 51 | #include <stdlib.h>
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| 52 | #include <string.h>
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| 53 | #include <unistd.h>
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| 54 |
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| 55 | static int fflag; /* Unlink existing files. */
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| 56 | static int hflag; /* Check new name for symlink first. */
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| 57 | static int iflag; /* Interactive mode. */
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| 58 | static int sflag; /* Symbolic, not hard, link. */
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| 59 | static int vflag; /* Verbose output. */
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| 60 | /* System link call. */
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| 61 | static int (*linkf)(const char *, const char *);
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| 62 | static char linkch;
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| 63 |
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| 64 | static int linkit(const char *, const char *, int);
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| 65 | static void usage(void);
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| 66 |
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| 67 | int
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| 68 | kmk_builtin_ln(int argc, char *argv[])
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| 69 | {
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| 70 | struct stat sb;
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| 71 | char *p, *sourcedir;
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| 72 | int ch, exitval;
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| 73 |
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| 74 | /*
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| 75 | * Test for the special case where the utility is called as
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| 76 | * "link", for which the functionality provided is greatly
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| 77 | * simplified.
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| 78 | */
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| 79 | if ((p = rindex(argv[0], '/')) == NULL)
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| 80 | p = argv[0];
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| 81 | else
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| 82 | ++p;
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| 83 | if (strcmp(p, "link") == 0) {
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| 84 | while (getopt(argc, argv, "") != -1)
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| 85 | usage();
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| 86 | argc -= optind;
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| 87 | argv += optind;
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| 88 | if (argc != 2)
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| 89 | usage();
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| 90 | linkf = link;
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| 91 | exit(linkit(argv[0], argv[1], 0));
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| 92 | }
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| 93 |
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| 94 | while ((ch = getopt(argc, argv, "fhinsv")) != -1)
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| 95 | switch (ch) {
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| 96 | case 'f':
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| 97 | fflag = 1;
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| 98 | iflag = 0;
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| 99 | break;
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| 100 | case 'h':
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| 101 | case 'n':
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| 102 | hflag = 1;
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| 103 | break;
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| 104 | case 'i':
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| 105 | iflag = 1;
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| 106 | fflag = 0;
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| 107 | break;
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| 108 | case 's':
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| 109 | sflag = 1;
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| 110 | break;
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| 111 | case 'v':
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| 112 | vflag = 1;
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| 113 | break;
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| 114 | case '?':
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| 115 | default:
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| 116 | usage();
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| 117 | }
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| 118 |
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| 119 | argv += optind;
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| 120 | argc -= optind;
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| 121 |
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| 122 | linkf = sflag ? symlink : link;
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| 123 | linkch = sflag ? '-' : '=';
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| 124 |
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| 125 | switch(argc) {
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| 126 | case 0:
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| 127 | usage();
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| 128 | /* NOTREACHED */
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| 129 | case 1: /* ln target */
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| 130 | exit(linkit(argv[0], ".", 1));
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| 131 | case 2: /* ln target source */
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| 132 | exit(linkit(argv[0], argv[1], 0));
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| 133 | default:
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| 134 | ;
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| 135 | }
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| 136 | /* ln target1 target2 directory */
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| 137 | sourcedir = argv[argc - 1];
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| 138 | if (hflag && lstat(sourcedir, &sb) == 0 && S_ISLNK(sb.st_mode)) {
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| 139 | /*
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| 140 | * We were asked not to follow symlinks, but found one at
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| 141 | * the target--simulate "not a directory" error
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| 142 | */
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| 143 | errno = ENOTDIR;
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| 144 | err(1, "%s", sourcedir);
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| 145 | }
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| 146 | if (stat(sourcedir, &sb))
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| 147 | err(1, "%s", sourcedir);
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| 148 | if (!S_ISDIR(sb.st_mode))
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| 149 | usage();
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| 150 | for (exitval = 0; *argv != sourcedir; ++argv)
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| 151 | exitval |= linkit(*argv, sourcedir, 1);
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| 152 | exit(exitval);
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| 153 | }
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| 154 |
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| 155 | int
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| 156 | linkit(const char *target, const char *source, int isdir)
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| 157 | {
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| 158 | struct stat sb;
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| 159 | const char *p;
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| 160 | int ch, exists, first;
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| 161 | char path[PATH_MAX];
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| 162 |
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| 163 | if (!sflag) {
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| 164 | /* If target doesn't exist, quit now. */
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| 165 | if (stat(target, &sb)) {
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| 166 | warn("%s", target);
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| 167 | return (1);
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| 168 | }
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| 169 | /* Only symbolic links to directories. */
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| 170 | if (S_ISDIR(sb.st_mode)) {
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| 171 | errno = EISDIR;
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| 172 | warn("%s", target);
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| 173 | return (1);
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| 174 | }
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| 175 | }
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| 176 |
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| 177 | /*
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| 178 | * If the source is a directory (and not a symlink if hflag),
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| 179 | * append the target's name.
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| 180 | */
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| 181 | if (isdir ||
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| 182 | (lstat(source, &sb) == 0 && S_ISDIR(sb.st_mode)) ||
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| 183 | (!hflag && stat(source, &sb) == 0 && S_ISDIR(sb.st_mode))) {
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| 184 | if ((p = strrchr(target, '/')) == NULL)
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| 185 | p = target;
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| 186 | else
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| 187 | ++p;
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| 188 | if (snprintf(path, sizeof(path), "%s/%s", source, p) >=
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| 189 | (ssize_t)sizeof(path)) {
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| 190 | errno = ENAMETOOLONG;
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| 191 | warn("%s", target);
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| 192 | return (1);
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| 193 | }
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| 194 | source = path;
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| 195 | }
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| 196 |
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| 197 | exists = !lstat(source, &sb);
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| 198 | /*
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| 199 | * If the file exists, then unlink it forcibly if -f was specified
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| 200 | * and interactively if -i was specified.
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| 201 | */
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| 202 | if (fflag && exists) {
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| 203 | if (unlink(source)) {
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| 204 | warn("%s", source);
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| 205 | return (1);
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| 206 | }
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| 207 | } else if (iflag && exists) {
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| 208 | fflush(stdout);
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| 209 | fprintf(stderr, "replace %s? ", source);
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| 210 |
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| 211 | first = ch = getchar();
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| 212 | while(ch != '\n' && ch != EOF)
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| 213 | ch = getchar();
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| 214 | if (first != 'y' && first != 'Y') {
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| 215 | fprintf(stderr, "not replaced\n");
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| 216 | return (1);
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| 217 | }
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| 218 |
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| 219 | if (unlink(source)) {
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| 220 | warn("%s", source);
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| 221 | return (1);
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| 222 | }
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| 223 | }
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| 224 |
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| 225 | /* Attempt the link. */
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| 226 | if ((*linkf)(target, source)) {
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| 227 | warn("%s", source);
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| 228 | return (1);
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| 229 | }
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| 230 | if (vflag)
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| 231 | (void)printf("%s %c> %s\n", source, linkch, target);
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| 232 | return (0);
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| 233 | }
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| 234 |
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| 235 | void
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| 236 | usage(void)
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| 237 | {
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| 238 | (void)fprintf(stderr, "%s\n%s\n%s\n",
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| 239 | "usage: ln [-fhinsv] source_file [target_file]",
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| 240 | " ln [-fhinsv] source_file ... target_dir",
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| 241 | " link source_file target_file");
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| 242 | exit(1);
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| 243 | }
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