1 /* $NetBSD: ln.c,v 1.20 2002/10/30 22:52:10 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) 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 #if 0 44 static char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94"; 45 #else 46 __RCSID("$NetBSD: ln.c,v 1.20 2002/10/30 22:52:10 kleink Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/stat.h> 52 53 #include <err.h> 54 #include <errno.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 int fflag; /* Unlink existing files. */ 61 int hflag; /* Check new name for symlink first. */ 62 int sflag; /* Symbolic, not hard, link. */ 63 /* System link call. */ 64 int (*linkf)(const char *, const char *); 65 66 int linkit(char *, char *, int); 67 void usage(void); 68 int main(int, char *[]); 69 70 int 71 main(int argc, char *argv[]) 72 { 73 struct stat sb; 74 int ch, exitval; 75 char *sourcedir; 76 77 setprogname(argv[0]); 78 while ((ch = getopt(argc, argv, "fhns")) != -1) 79 switch (ch) { 80 case 'f': 81 fflag = 1; 82 break; 83 case 'h': 84 case 'n': 85 hflag = 1; 86 break; 87 case 's': 88 sflag = 1; 89 break; 90 case '?': 91 default: 92 usage(); 93 } 94 95 argv += optind; 96 argc -= optind; 97 98 linkf = sflag ? symlink : link; 99 100 switch(argc) { 101 case 0: 102 usage(); 103 /* NOTREACHED */ 104 case 1: /* ln target */ 105 exit(linkit(argv[0], ".", 1)); 106 /* NOTREACHED */ 107 case 2: /* ln target source */ 108 exit(linkit(argv[0], argv[1], 0)); 109 /* NOTREACHED */ 110 } 111 /* ln target1 target2 directory */ 112 sourcedir = argv[argc - 1]; 113 if (hflag && lstat(sourcedir, &sb) == 0 && S_ISLNK(sb.st_mode)) { 114 /* we were asked not to follow symlinks, but found one at 115 the target--simulate "not a directory" error */ 116 errno = ENOTDIR; 117 err(1, "%s", sourcedir); 118 } 119 if (stat(sourcedir, &sb)) 120 err(1, "%s", sourcedir); 121 if (!S_ISDIR(sb.st_mode)) 122 usage(); 123 for (exitval = 0; *argv != sourcedir; ++argv) 124 exitval |= linkit(*argv, sourcedir, 1); 125 exit(exitval); 126 /* NOTREACHED */ 127 } 128 129 int 130 linkit(char *target, char *source, int isdir) 131 { 132 struct stat sb; 133 char *p, path[MAXPATHLEN]; 134 135 if (!sflag) { 136 /* If target doesn't exist, quit now. */ 137 if (stat(target, &sb)) { 138 warn("%s", target); 139 return (1); 140 } 141 } 142 143 /* If the source is a directory (and not a symlink if hflag), 144 append the target's name. */ 145 if (isdir || 146 (!lstat(source, &sb) && S_ISDIR(sb.st_mode)) || 147 (!hflag && !stat(source, &sb) && S_ISDIR(sb.st_mode))) { 148 if ((p = strrchr(target, '/')) == NULL) 149 p = target; 150 else 151 ++p; 152 (void)snprintf(path, sizeof(path), "%s/%s", source, p); 153 source = path; 154 } 155 156 /* 157 * If the file exists, and -f was specified, unlink it. 158 * Attempt the link. 159 */ 160 if ((fflag && unlink(source) < 0 && errno != ENOENT) || 161 (*linkf)(target, source)) { 162 warn("%s", source); 163 return (1); 164 } 165 166 return (0); 167 } 168 169 void 170 usage(void) 171 { 172 173 (void)fprintf(stderr, 174 "Usage:\t%s [-fhns] file1 file2\n\t%s [-fhns] file ... directory\n", 175 getprogname(), getprogname()); 176 exit(1); 177 /* NOTREACHED */ 178 } 179