1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/stat.h> 33 34 #include <err.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 39 static void usage(void) __dead2; 40 41 int 42 main(int argc, char *argv[]) 43 { 44 struct stat sb; 45 int ch; 46 char *name; 47 48 49 while ((ch = getopt(argc, argv, "")) != -1) 50 switch(ch) { 51 case '?': 52 default: 53 usage(); 54 } 55 argc -= optind; 56 argv += optind; 57 58 if ((name = ttyname(STDIN_FILENO)) == NULL && 59 (name = ttyname(STDOUT_FILENO)) == NULL && 60 (name = ttyname(STDERR_FILENO)) == NULL) 61 err(2, "unknown tty"); 62 63 if (stat(name, &sb)) 64 err(2, "stat"); 65 66 if (*argv == NULL) { 67 (void)printf("is %s\n", 68 sb.st_mode & S_IXUSR ? "y" : 69 sb.st_mode & S_IXGRP ? "b" : "n"); 70 return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1); 71 72 } 73 74 switch (argv[0][0]) { 75 case 'n': 76 if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0) 77 err(2, "%s", name); 78 break; 79 case 'y': 80 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR) 81 < 0) 82 err(2, "%s", name); 83 break; 84 case 'b': 85 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP) 86 < 0) 87 err(2, "%s", name); 88 break; 89 default: 90 usage(); 91 } 92 return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1); 93 } 94 95 static void 96 usage(void) 97 { 98 (void)fprintf(stderr, "usage: biff [n | y | b]\n"); 99 exit(2); 100 } 101