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 34 #ifndef lint 35 static char const copyright[] = 36 "@(#) Copyright (c) 1987, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94"; 43 #endif 44 static const char rcsid[] = 45 "$FreeBSD$"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/stat.h> 50 51 #include <err.h> 52 #include <errno.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 int fflag; /* Unlink existing files. */ 59 int hflag; /* Check new name for symlink first. */ 60 int iflag; /* Interactive mode. */ 61 int sflag; /* Symbolic, not hard, link. */ 62 int vflag; /* Verbose output. */ 63 /* System link call. */ 64 int (*linkf) __P((const char *, const char *)); 65 char linkch; 66 67 int linkit __P((char *, char *, int)); 68 int main __P((int, char *[])); 69 void usage __P((void)); 70 71 int 72 main(argc, argv) 73 int argc; 74 char *argv[]; 75 { 76 struct stat sb; 77 int ch, exitval; 78 char *p, *sourcedir; 79 80 /* 81 * Test for the special case where the utility is called as 82 * "link", for which the functionality provided is greatly 83 * simplified. 84 */ 85 if ((p = rindex(argv[0], '/')) == NULL) 86 p = argv[0]; 87 else 88 ++p; 89 if (strcmp(p, "link") == 0) { 90 if (argc == 3) { 91 linkf = link; 92 exit(linkit(argv[1], argv[2], 0)); 93 } else 94 usage(); 95 } 96 97 while ((ch = getopt(argc, argv, "fhinsv")) != -1) 98 switch (ch) { 99 case 'f': 100 fflag = 1; 101 iflag = 0; 102 break; 103 case 'h': 104 case 'n': 105 hflag = 1; 106 break; 107 case 'i': 108 iflag = 1; 109 fflag = 0; 110 break; 111 case 's': 112 sflag = 1; 113 break; 114 case 'v': 115 vflag = 1; 116 break; 117 case '?': 118 default: 119 usage(); 120 } 121 122 argv += optind; 123 argc -= optind; 124 125 linkf = sflag ? symlink : link; 126 linkch = sflag ? '-' : '='; 127 128 switch(argc) { 129 case 0: 130 usage(); 131 /* NOTREACHED */ 132 case 1: /* ln target */ 133 exit(linkit(argv[0], ".", 1)); 134 case 2: /* ln target source */ 135 exit(linkit(argv[0], argv[1], 0)); 136 } 137 /* ln target1 target2 directory */ 138 sourcedir = argv[argc - 1]; 139 if (hflag && lstat(sourcedir, &sb) == 0 && S_ISLNK(sb.st_mode)) { 140 /* 141 * We were asked not to follow symlinks, but found one at 142 * the target--simulate "not a directory" error 143 */ 144 errno = ENOTDIR; 145 err(1, "%s", sourcedir); 146 } 147 if (stat(sourcedir, &sb)) 148 err(1, "%s", sourcedir); 149 if (!S_ISDIR(sb.st_mode)) 150 usage(); 151 for (exitval = 0; *argv != sourcedir; ++argv) 152 exitval |= linkit(*argv, sourcedir, 1); 153 exit(exitval); 154 } 155 156 int 157 linkit(target, source, isdir) 158 char *target, *source; 159 int isdir; 160 { 161 struct stat sb; 162 int ch, exists, first; 163 char *p, path[MAXPATHLEN]; 164 165 if (!sflag) { 166 /* If target doesn't exist, quit now. */ 167 if (stat(target, &sb)) { 168 warn("%s", target); 169 return (1); 170 } 171 /* Only symbolic links to directories. */ 172 if (S_ISDIR(sb.st_mode)) { 173 errno = EISDIR; 174 warn("%s", target); 175 return (1); 176 } 177 } 178 179 /* 180 * If the source is a directory (and not a symlink if hflag), 181 * append the target's name. 182 */ 183 if (isdir || 184 (lstat(source, &sb) == 0 && S_ISDIR(sb.st_mode)) || 185 (!hflag && stat(source, &sb) == 0 && S_ISDIR(sb.st_mode))) { 186 if ((p = strrchr(target, '/')) == NULL) 187 p = target; 188 else 189 ++p; 190 (void)snprintf(path, sizeof(path), "%s/%s", source, p); 191 source = path; 192 } 193 194 exists = !lstat(source, &sb); 195 /* 196 * If the file exists, then unlink it forcibly if -f was specified 197 * and interactively if -i was specified. 198 */ 199 if (fflag && exists) { 200 if (unlink(source)) { 201 warn("%s", source); 202 return (1); 203 } 204 } else if (iflag && exists) { 205 fflush(stdout); 206 fprintf(stderr, "replace %s? ", source); 207 208 first = ch = getchar(); 209 while(ch != '\n' && ch != EOF) 210 ch = getchar(); 211 if (first != 'y' && first != 'Y') { 212 fprintf(stderr, "not replaced\n"); 213 return (1); 214 } 215 216 if (unlink(source)) { 217 warn("%s", source); 218 return (1); 219 } 220 } 221 222 /* Attempt the link. */ 223 if ((*linkf)(target, source)) { 224 warn("%s", source); 225 return (1); 226 } 227 if (vflag) 228 (void)printf("%s %c> %s\n", source, linkch, target); 229 return (0); 230 } 231 232 void 233 usage() 234 { 235 (void)fprintf(stderr, "%s\n%s\n%s\n", 236 "usage: ln [-fhinsv] file1 file2", 237 " ln [-fhinsv] file ... directory", 238 " link file1 file2"); 239 exit(1); 240 } 241