1 files changed, 100 insertions, 0 deletions
diff --git a/usr.bin/biff/biff.c b/usr.bin/biff/biff.c
new file mode 100644
index 000000000000..b1cdd5186e7e
--- /dev/null
+++ b/usr.bin/biff/biff.c
@@ -0,0 +1,100 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * 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. 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.
+ */
+
+#include <sys/stat.h>
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void usage(void) __dead2;
+
+int
+main(int argc, char *argv[])
+{
+	struct stat sb;
+	int ch;
+	char *name;
+
+
+	while ((ch = getopt(argc, argv, "")) != -1)
+		switch(ch) {
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if ((name = ttyname(STDIN_FILENO)) == NULL &&
+	    (name = ttyname(STDOUT_FILENO)) == NULL &&
+	    (name = ttyname(STDERR_FILENO)) == NULL)
+		err(2, "unknown tty");
+
+	if (stat(name, &sb))
+		err(2, "stat");
+
+	if (*argv == NULL) {
+		(void)printf("is %s\n",
+		    sb.st_mode & S_IXUSR ? "y" :
+		    sb.st_mode & S_IXGRP ? "b" : "n");
+		return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
+
+	}
+
+	switch (argv[0][0]) {
+	case 'n':
+		if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0)
+			err(2, "%s", name);
+		break;
+	case 'y':
+		if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR)
+		    < 0)
+			err(2, "%s", name);
+		break;
+	case 'b':
+		if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP)
+		    < 0)
+			err(2, "%s", name);
+		break;
+	default:
+		usage();
+	}
+	return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1);
+}
+
+static void
+usage(void)
+{
+	(void)fprintf(stderr, "usage: biff [n | y | b]\n");
+	exit(2);
+}