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- /*
- * Copyright (c) 1987 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #ifndef lint
- char copyright[] =
- "@(#) Copyright (c) 1987 Regents of the University of California.\n\
- All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char sccsid[] = "@(#)ln.c 4.15 (Berkeley) 2/24/91";
- #endif /* not lint */
-
- #include <sys/param.h>
- #include <sys/stat.h>
- #include <stdio.h>
- #include <errno.h>
- #include <string.h>
- #include <stdlib.h>
- #include <unistd.h>
-
- static int dirflag, /* undocumented force flag */
- sflag, /* symbolic, not hard, link */
- (*linkf)(); /* system link call */
- static linkit(), usage();
-
- main(argc, argv)
- int argc;
- char **argv;
- {
- extern int optind;
- struct stat buf;
- int ch, exitval, link(), symlink();
- char *sourcedir;
-
- while ((ch = getopt(argc, argv, "Fs")) != EOF)
- switch((char)ch) {
- case 'F':
- dirflag = 1;
- break;
- case 's':
- sflag = 1;
- break;
- case '?':
- default:
- usage();
- }
-
- argv += optind;
- argc -= optind;
-
- linkf = sflag ? symlink : link;
-
- switch(argc) {
- case 0:
- usage();
- case 1: /* ln target */
- exit(linkit(argv[0], ".", 1));
- case 2: /* ln target source */
- exit(linkit(argv[0], argv[1], 0));
- default: /* ln target1 target2 directory */
- sourcedir = argv[argc - 1];
- if (stat(sourcedir, &buf)) {
- (void)fprintf(stderr,
- "ln: %s: %s\n", sourcedir, strerror(errno));
- exit(1);
- }
- if (!S_ISDIR(buf.st_mode))
- usage();
- for (exitval = 0; *argv != sourcedir; ++argv)
- exitval |= linkit(*argv, sourcedir, 1);
- exit(exitval);
- }
- /* NOTREACHED */
- }
-
- static
- linkit(target, source, isdir)
- char *target, *source;
- int isdir;
- {
- struct stat buf;
- char path[MAXPATHLEN], *cp;
-
- if (!sflag) {
- /* if target doesn't exist, quit now */
- if (stat(target, &buf)) {
- (void)fprintf(stderr,
- "ln: %s: %s\n", target, strerror(errno));
- return(1);
- }
- /* only symbolic links to directories, unless -F option used */
- if (!dirflag && (buf.st_mode & S_IFMT) == S_IFDIR) {
- (void)printf("ln: %s is a directory.\n", target);
- return(1);
- }
- }
-
- /* if the source is a directory, append the target's name */
- if (isdir || !stat(source, &buf) && (buf.st_mode & S_IFMT) == S_IFDIR) {
- if (!(cp = rindex(target, '/')))
- cp = target;
- else
- ++cp;
- (void)sprintf(path, "%s/%s", source, cp);
- source = path;
- }
-
- if ((*linkf)(target, source)) {
- (void)fprintf(stderr, "ln: %s: %s\n", source, strerror(errno));
- return(1);
- }
- return(0);
- }
-
- static
- usage()
- {
- (void)fprintf(stderr,
- "usage:\tln [-s] file1 file2\n\tln [-s] file ... directory\n");
- exit(1);
- }
-