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 9b37f09..ad666f7 100644 (file)
--- a/usr/src/usr.bin/mesg/mesg.c
+++ b/usr/src/usr.bin/mesg/mesg.c
@@ -1,58 +1,104 @@
-static char *sccsid = "@(#)mesg.c      4.2 (Berkeley) %G%";

 /*
 /*

- * mesg -- set current tty to accept or
- *     forbid write permission.
+ * 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.

  *
  *

- *     mesg [y] [n]
- *             y allow messages
- *             n forbid messages
+ * 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.

  */
 
  */
 

-#include <stdio.h>
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1987, 1993\n\
+       The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)mesg.c     8.2 (Berkeley) 1/21/94";
+#endif /* not lint */
+

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

-struct stat sbuf;
-
-char *tty;
-char *ttyname();
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>

 
 

+int

 main(argc, argv)
 main(argc, argv)

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

 {
 {

-       int r=0;
-       tty = ttyname(2);
-       if (tty == 0)
-               exit(13);
-       if(stat(tty, &sbuf) < 0) error("cannot stat");
-       if(argc < 2) {
-               if(sbuf.st_mode & 02)
-                       fprintf(stderr,"is y\n");
-               else {  r=1;
-                       fprintf(stderr,"is n\n");
+       struct stat sb;
+       char *tty;
+       int ch;
+
+       while ((ch = getopt(argc, argv, "")) != EOF)
+               switch (ch) {
+               case '?':
+               default:
+                       goto usage;

                }
                }

-       } else  switch(*argv[1]) {
-               case 'y':
-                       newmode(sbuf.st_mode|022); break;
+       argc -= optind;
+       argv += optind;

 
 

-               case 'n':
-                       newmode(sbuf.st_mode&~022); r=1; break;
+       if ((tty = ttyname(STDERR_FILENO)) == NULL)
+               err(1, "ttyname");
+       if (stat(tty, &sb) < 0)
+               err(1, "%s", tty);

 
 

-               default:
-                       error("usage: mesg [y] [n]");
+       if (*argv == NULL) {
+               if (sb.st_mode & S_IWGRP) {
+                       (void)fprintf(stderr, "is y\n");
+                       exit(0);

                }
                }

-       exit(r);
-}
+               (void)fprintf(stderr, "is n\n");
+               exit(1);
+       }

 
 

-error(s)
-char *s;
-{
-       fprintf(stderr,"mesg: %s\n",s);
-       exit(-1);
-}
+       switch (*argv[0]) {
+       case 'y':
+               if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
+                       err(1, "%s", tty);
+               exit(0);
+       case 'n':
+               if (chmod(tty, sb.st_mode & ~S_IWGRP) < 0)
+                       err(1, "%s", tty);
+               exit(1);
+       }

 
 

-newmode(m)
-{
-       if(chmod(tty,m)<0)
-               error("cannot change mode");
+usage: (void)fprintf(stderr, "usage: mesg [y | n]\n");
+       exit(2);

 }
 }