1 /* 2 * Copyright (c) 1987, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $Id: ln.c,v 1.4 1994/09/24 02:55:48 davidg Exp $ 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1987, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 static char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94"; 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 int dirflag; /* Undocumented directory flag. */ 57 int fflag; /* Unlink existing files. */ 58 int sflag; /* Symbolic, not hard, link. */ 59 /* System link call. */ 60 int (*linkf) __P((const char *, const char *)); 61 62 int linkit __P((char *, char *, int)); 63 void usage __P((void)); 64 65 int 66 main(argc, argv) 67 int argc; 68 char *argv[]; 69 { 70 extern int optind; 71 struct stat sb; 72 int ch, exitval; 73 char *sourcedir; 74 75 while ((ch = getopt(argc, argv, "Ffs")) != EOF) 76 switch (ch) { 77 case 'F': 78 dirflag = 1; /* XXX: deliberately undocumented. */ 79 break; 80 case 'f': 81 fflag = 1; 82 break; 83 case 's': 84 sflag = 1; 85 break; 86 case '?': 87 default: 88 usage(); 89 } 90 91 argv += optind; 92 argc -= optind; 93 94 linkf = sflag ? symlink : link; 95 96 switch(argc) { 97 case 0: 98 usage(); 99 case 1: /* ln target */ 100 exit(linkit(argv[0], ".", 1)); 101 case 2: /* ln target source */ 102 exit(linkit(argv[0], argv[1], 0)); 103 } 104 /* ln target1 target2 directory */ 105 sourcedir = argv[argc - 1]; 106 if (stat(sourcedir, &sb)) 107 err(1, "%s", sourcedir); 108 if (!S_ISDIR(sb.st_mode)) 109 usage(); 110 for (exitval = 0; *argv != sourcedir; ++argv) 111 exitval |= linkit(*argv, sourcedir, 1); 112 exit(exitval); 113 } 114 115 int 116 linkit(target, source, isdir) 117 char *target, *source; 118 int isdir; 119 { 120 struct stat sb; 121 int exists; 122 char *p, path[MAXPATHLEN]; 123 124 if (!sflag) { 125 /* If target doesn't exist, quit now. */ 126 if (stat(target, &sb)) { 127 warn("%s", target); 128 return (1); 129 } 130 /* Only symbolic links to directories, unless -F option used. */ 131 if (!dirflag && (sb.st_mode & S_IFMT) == S_IFDIR) { 132 warnx("%s: is a directory", target); 133 return (1); 134 } 135 } 136 137 /* If the source is a directory, append the target's name. */ 138 if (isdir || ((exists = !stat(source, &sb)) && S_ISDIR(sb.st_mode))) { 139 if ((p = strrchr(target, '/')) == NULL) 140 p = target; 141 else 142 ++p; 143 (void)snprintf(path, sizeof(path), "%s/%s", source, p); 144 source = path; 145 exists = !lstat(source, &sb); 146 } else 147 exists = !lstat(source, &sb); 148 149 /* 150 * If the file exists, and -f was specified, unlink it. 151 * Attempt the link. 152 */ 153 if ((fflag && exists && unlink(source)) || (*linkf)(target, source)) { 154 warn("%s", source); 155 return (1); 156 } 157 return (0); 158 } 159 160 void 161 usage() 162 { 163 (void)fprintf(stderr, 164 "usage:\tln [-fs] file1 file2\n\tln [-fs] file ... directory\n"); 165 exit(1); 166 } 167