biff.c revision 100627
1123355Sdeischen/* 2123355Sdeischen * Copyright (c) 1980, 1993 3123355Sdeischen * The Regents of the University of California. All rights reserved. 4123355Sdeischen * 5123355Sdeischen * Redistribution and use in source and binary forms, with or without 6123355Sdeischen * modification, are permitted provided that the following conditions 7123355Sdeischen * are met: 8123355Sdeischen * 1. Redistributions of source code must retain the above copyright 9123355Sdeischen * notice, this list of conditions and the following disclaimer. 10123355Sdeischen * 2. Redistributions in binary form must reproduce the above copyright 11123355Sdeischen * notice, this list of conditions and the following disclaimer in the 12123355Sdeischen * documentation and/or other materials provided with the distribution. 13123355Sdeischen * 3. All advertising materials mentioning features or use of this software 14123355Sdeischen * must display the following acknowledgement: 15123355Sdeischen * This product includes software developed by the University of 16123355Sdeischen * California, Berkeley and its contributors. 17123355Sdeischen * 4. Neither the name of the University nor the names of its contributors 18123355Sdeischen * may be used to endorse or promote products derived from this software 19123355Sdeischen * without specific prior written permission. 20123355Sdeischen * 21123355Sdeischen * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22123355Sdeischen * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23123355Sdeischen * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24123355Sdeischen * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25123355Sdeischen * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26123355Sdeischen * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27123355Sdeischen * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28123355Sdeischen * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29123355Sdeischen * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30123355Sdeischen * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31123355Sdeischen * SUCH DAMAGE. 32123355Sdeischen */ 33123355Sdeischen 34123355Sdeischen#ifndef lint 35156611Sdeischenstatic const char copyright[] = 36156611Sdeischen"@(#) Copyright (c) 1980, 1993\n\ 37156611Sdeischen The Regents of the University of California. All rights reserved.\n"; 38174112Sdeischen#endif 39174112Sdeischen 40174112Sdeischen#if 0 41123355Sdeischen#ifndef lint 42123355Sdeischenstatic char sccsid[] = "@(#)biff.c 8.1 (Berkeley) 6/6/93"; 43123355Sdeischen#endif 44123355Sdeischen#endif 45123355Sdeischen 46123355Sdeischen#include <sys/cdefs.h> 47123355Sdeischen__FBSDID("$FreeBSD: head/usr.bin/biff/biff.c 100627 2002-07-24 18:54:59Z robert $"); 48123355Sdeischen 49123355Sdeischen#include <sys/stat.h> 50123355Sdeischen 51123355Sdeischen#include <err.h> 52123365Sdeischen#include <stdio.h> 53123355Sdeischen#include <stdlib.h> 54123355Sdeischen#include <unistd.h> 55123355Sdeischen 56static void usage(void); 57 58int 59main(int argc, char *argv[]) 60{ 61 struct stat sb; 62 int ch; 63 char *name; 64 65 66 while ((ch = getopt(argc, argv, "")) != -1) 67 switch(ch) { 68 case '?': 69 default: 70 usage(); 71 } 72 argc -= optind; 73 argv += optind; 74 75 if ((name = ttyname(STDIN_FILENO)) == NULL && 76 (name = ttyname(STDOUT_FILENO)) == NULL && 77 (name = ttyname(STDERR_FILENO)) == NULL) 78 err(2, "unknown tty"); 79 80 if (stat(name, &sb)) 81 err(2, "stat"); 82 83 if (*argv == NULL) { 84 (void)printf("is %s\n", 85 sb.st_mode & S_IXUSR ? "y" : 86 sb.st_mode & S_IXGRP ? "b" : "n"); 87 return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1); 88 89 } 90 91 switch (argv[0][0]) { 92 case 'n': 93 if (chmod(name, sb.st_mode & ~(S_IXUSR | S_IXGRP)) < 0) 94 err(2, "%s", name); 95 break; 96 case 'y': 97 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXUSR) 98 < 0) 99 err(2, "%s", name); 100 break; 101 case 'b': 102 if (chmod(name, (sb.st_mode & ~(S_IXUSR | S_IXGRP)) | S_IXGRP) 103 < 0) 104 err(2, "%s", name); 105 break; 106 default: 107 usage(); 108 } 109 return (sb.st_mode & (S_IXUSR | S_IXGRP) ? 0 : 1); 110} 111 112static void 113usage() 114{ 115 (void)fprintf(stderr, "usage: biff [n | y | b]\n"); 116 exit(2); 117} 118