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 * $Id$ 34 */ 35 36 #ifndef lint 37 static char const 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 const 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 fflag; /* Unlink existing files. */ 57 int sflag; /* Symbolic, not hard, link. */ 58 /* System link call. */ 59 int (*linkf) __P((const char *, const char *)); 60 61 int linkit __P((char *, char *, int)); 62 void usage __P((void)); 63 64 int 65 main(argc, argv) 66 int argc; 67 char *argv[]; 68 { 69 extern int optind; 70 struct stat sb; 71 int ch, exitval; 72 char *sourcedir; 73 74 while ((ch = getopt(argc, argv, "fs")) != EOF) 75 switch (ch) { 76 case 'f': 77 fflag = 1; 78 break; 79 case 's': 80 sflag = 1; 81 break; 82 case '?': 83 default: 84 usage(); 85 } 86 87 argv += optind; 88 argc -= optind; 89 90 linkf = sflag ? symlink : link; 91 92 switch(argc) { 93 case 0: 94 usage(); 95 case 1: /* ln target */ 96 exit(linkit(argv[0], ".", 1)); 97 case 2: /* ln target source */ 98 exit(linkit(argv[0], argv[1], 0)); 99 } 100 /* ln target1 target2 directory */ 101 sourcedir = argv[argc - 1]; 102 if (stat(sourcedir, &sb)) 103 err(1, "%s", sourcedir); 104 if (!S_ISDIR(sb.st_mode)) 105 usage(); 106 for (exitval = 0; *argv != sourcedir; ++argv) 107 exitval |= linkit(*argv, sourcedir, 1); 108 exit(exitval); 109 } 110 111 int 112 linkit(target, source, isdir) 113 char *target, *source; 114 int isdir; 115 { 116 struct stat sb; 117 int exists; 118 char *p, path[MAXPATHLEN]; 119 120 if (!sflag) { 121 /* If target doesn't exist, quit now. */ 122 if (stat(target, &sb)) { 123 warn("%s", target); 124 return (1); 125 } 126 /* Only symbolic links to directories. */ 127 if (S_ISDIR(sb.st_mode)) { 128 errno = EISDIR; 129 warn("%s", target); 130 return (1); 131 } 132 } 133 134 /* If the source is a directory, append the target's name. */ 135 if (isdir || ((exists = !stat(source, &sb)) && S_ISDIR(sb.st_mode))) { 136 if ((p = strrchr(target, '/')) == NULL) 137 p = target; 138 else 139 ++p; 140 (void)snprintf(path, sizeof(path), "%s/%s", source, p); 141 source = path; 142 exists = !lstat(source, &sb); 143 } else 144 exists = !lstat(source, &sb); 145 146 /* 147 * If the file exists, and -f was specified, unlink it. 148 * Attempt the link. 149 */ 150 if ((fflag && exists && unlink(source)) || (*linkf)(target, source)) { 151 warn("%s", source); 152 return (1); 153 } 154 return (0); 155 } 156 157 void 158 usage() 159 { 160 (void)fprintf(stderr, 161 "usage:\tln [-fs] file1 file2\n\tln [-fs] file ... directory\n"); 162 exit(1); 163 } 164