BSD 4_4_Lite1 release

[unix-history] / usr / src / usr.bin / mesg / mesg.c

diff --git a/usr/src/usr.bin/mesg/mesg.c b/usr/src/usr.bin/mesg/mesg.c
index fbfcd2b..ad666f7 100644 (file)
--- a/usr/src/usr.bin/mesg/mesg.c
+++ b/usr/src/usr.bin/mesg/mesg.c
@@ -1,84 +1,104 @@
 /*
 /*

- * Copyright (c) 1987 Regents of the University of California.
- * All rights reserved.
+ * Copyright (c) 1987, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.

  *
  *

- * Redistribution and use in source and binary forms are permitted
- * provided that this notice is preserved and that due credit is given
- * to the University of California at Berkeley. The name of the University
- * may not be used to endorse or promote products derived from this
- * software without specific written prior permission. This software
- * is provided ``as is'' without express or implied warranty.
+ * 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
  */
 
 #ifndef lint

-char copyright[] =
-"@(#) Copyright (c) 1987 Regents of the University of California.\n\
- All rights reserved.\n";
+static char copyright[] =
+"@(#) Copyright (c) 1987, 1993\n\
+       The Regents of the University of California.  All rights reserved.\n";

 #endif /* not lint */
 
 #ifndef lint
 #endif /* not lint */
 
 #ifndef lint

-static char sccsid[] = "@(#)mesg.c     4.4 (Berkeley) %G%";
+static char sccsid[] = "@(#)mesg.c     8.2 (Berkeley) 1/21/94";

 #endif /* not lint */
 
 #endif /* not lint */
 

-/*
- * mesg -- set current tty to accept or
- *     forbid write permission.
- *
- *     mesg [y] [n]
- *             y allow messages
- *             n forbid messages
- */
-

 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/stat.h>

-#include <stdio.h>

 
 

-static char *tty;
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>

 
 

+int

 main(argc, argv)
        int argc;
 main(argc, argv)
        int argc;

-       char **argv;
+       char *argv[];

 {
 {

-       struct stat sbuf;
-       char *ttyname();
+       struct stat sb;
+       char *tty;
+       int ch;

 
 

-       if (!(tty = ttyname(2))) {
-               fputs("mesg: not a device in /dev.\n", stderr);
-               exit(-1);
-       }
-       if (stat(tty, &sbuf) < 0) {
-               perror("mesg");
-               exit(-1);
-       }
-       if (argc < 2) {
-               if (sbuf.st_mode & 020) {
-                       fputs("is y\n", stderr);
+       while ((ch = getopt(argc, argv, "")) != EOF)
+               switch (ch) {
+               case '?':
+               default:
+                       goto usage;
+               }
+       argc -= optind;
+       argv += optind;
+
+       if ((tty = ttyname(STDERR_FILENO)) == NULL)
+               err(1, "ttyname");
+       if (stat(tty, &sb) < 0)
+               err(1, "%s", tty);
+
+       if (*argv == NULL) {
+               if (sb.st_mode & S_IWGRP) {
+                       (void)fprintf(stderr, "is y\n");

                        exit(0);
                }
                        exit(0);
                }

-               fputs("is n\n", stderr);
+               (void)fprintf(stderr, "is n\n");

                exit(1);
        }
                exit(1);
        }

-#define        OTHER_WRITE     020
-       switch(*argv[1]) {
+
+       switch (*argv[0]) {

        case 'y':
        case 'y':

-               newmode(sbuf.st_mode | OTHER_WRITE);
+               if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
+                       err(1, "%s", tty);

                exit(0);
        case 'n':
                exit(0);
        case 'n':

-               newmode(sbuf.st_mode &~ OTHER_WRITE);
+               if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0)
+                       err(1, "%s", tty);

                exit(1);
                exit(1);

-       default:
-               fputs("usage: mesg [y] [n]\n", stderr);
-               exit(-1);

        }
        }

-       /*NOTREACHED*/
-}

 
 

-static
-newmode(m)
-       u_short m;
-{
-       if (chmod(tty, m) < 0) {
-               perror("mesg");
-               exit(-1);
-       }
+usage: (void)fprintf(stderr, "usage: mesg [y | n]\n");
+       exit(2);

 }
 }