BSD 4.4 Lite bin Sources

1 files changed, 164 insertions, 0 deletions

diff --git a/bin/ln/ln.c b/bin/ln/ln.c
new file mode 100644
index 0000000..b39e710
--- /dev/null
+++ b/bin/ln/ln.c
@@ -0,0 +1,164 @@
+/*
+ * Copyright (c) 1987, 1993, 1994
+ *	The 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
+static char copyright[] =
+"@(#) Copyright (c) 1987, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)ln.c	8.2 (Berkeley) 3/31/94";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int	dirflag;			/* Undocumented directory flag. */
+int	fflag;				/* Unlink existing files. */
+int	sflag;				/* Symbolic, not hard, link. */
+					/* System link call. */
+int (*linkf) __P((const char *, const char *));
+
+int	linkit __P((char *, char *, int));
+void	usage __P((void));
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	extern int optind;
+	struct stat sb;
+	int ch, exitval;
+	char *sourcedir;
+
+	while ((ch = getopt(argc, argv, "Ffs")) != EOF)
+		switch (ch) {
+		case 'F':
+			dirflag = 1;	/* XXX: deliberately undocumented. */
+			break;
+		case 'f':
+			fflag = 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));
+	}
+					/* ln target1 target2 directory */
+	sourcedir = argv[argc - 1];
+	if (stat(sourcedir, &sb))
+		err(1, "%s", sourcedir);
+	if (!S_ISDIR(sb.st_mode))
+		usage();
+	for (exitval = 0; *argv != sourcedir; ++argv)
+		exitval |= linkit(*argv, sourcedir, 1);
+	exit(exitval);
+}
+
+int
+linkit(target, source, isdir)
+	char *target, *source;
+	int isdir;
+{
+	struct stat sb;
+	int exists;
+	char *p, path[MAXPATHLEN];
+
+	if (!sflag) {
+		/* If target doesn't exist, quit now. */
+		if (stat(target, &sb)) {
+			warn("%s", target);
+			return (1);
+		}
+		/* Only symbolic links to directories, unless -F option used. */
+		if (!dirflag && (sb.st_mode & S_IFMT) == S_IFDIR) {
+			warnx("%s: is a directory", target);
+			return (1);
+		}
+	}
+
+	/* If the source is a directory, append the target's name. */
+	if (isdir || (exists = !stat(source, &sb)) && S_ISDIR(sb.st_mode)) {
+		if ((p = strrchr(target, '/')) == NULL)
+			p = target;
+		else
+			++p;
+		(void)snprintf(path, sizeof(path), "%s/%s", source, p);
+		source = path;
+		exists = !stat(source, &sb);
+	} else
+		exists = !stat(source, &sb);
+
+	/*
+	 * If the file exists, and -f was specified, unlink it.
+	 * Attempt the link.
+	 */
+	if (fflag && exists && unlink(source) || (*linkf)(target, source)) {
+		warn("%s", source);
+		return (1);
+	}
+	return (0);
+}
+
+void
+usage()
+{
+	(void)fprintf(stderr,
+	    "usage:\tln [-fs] file1 file2\n\tln [-fs] file ... directory\n");
+	exit(1);
+}