1 files changed, 114 insertions, 0 deletions
diff --git a/usr.bin/biff/biff.c b/usr.bin/biff/biff.c
new file mode 100644
index 0000000..8d816bf
--- /dev/null
+++ b/usr.bin/biff/biff.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 1980, 1993
+ *	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) 1980, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)biff.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void usage __P((void));
+static void err __P((char *));
+
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	struct stat sb;
+	int ch;
+	char *name;
+
+
+	while ((ch = getopt(argc, argv, "")) != EOF)
+		switch(ch) {
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if ((name = ttyname(STDERR_FILENO)) == NULL) {
+		(void)fprintf(stderr, "biff: unknown tty\n");
+		exit(2);
+	}
+
+	if (stat(name, &sb))
+		err(name);
+
+	if (*argv == NULL) {
+		(void)printf("is %s\n", sb.st_mode&0100 ? "y" : "n");
+		exit(sb.st_mode & 0100 ? 0 : 1);
+	}
+
+	switch(argv[0][0]) {
+	case 'n':
+		if (chmod(name, sb.st_mode & ~0100) < 0)
+			err(name);
+		break;
+	case 'y':
+		if (chmod(name, sb.st_mode | 0100) < 0)
+			err(name);
+		break;
+	default:
+		usage();
+	}
+	exit(sb.st_mode & 0100 ? 0 : 1);
+}
+
+static void
+err(name)
+	char *name;
+{
+	(void)fprintf(stderr, "biff: %s: %s\n", name, strerror(errno));
+	exit(2);
+}
+
+static void
+usage()
+{
+	(void)fprintf(stderr, "usage: biff [y | n]\n");
+	exit(2);
+}