-M option for ttyctl

[Zefram <A.Main@dcs.warwick.ac.uk>]

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This simple patch adds the previously discussed -M option to ttyctl.  I
intend to add -M to all builtins for which it is meaningful.

 -zefram

      *** 1.4	1996/01/07 03:53:14
      --- Src/builtin.c	1996/01/08 06:05:18
      ***************
      *** 5191,5202 ****
        int
        bin_ttyctl(char *name, char **argv, char *ops, int func)
        {
      !     if (!ops['@'])
      ! 	printf("tty is %sfrozen\n", ttyfrozen ? "" : "not ");
      !     else if (ops['f'])
        	ttyfrozen = 1;
      !     else
        	ttyfrozen = 0;
            return 0;
        }
        
      --- 5191,5207 ----
        int
        bin_ttyctl(char *name, char **argv, char *ops, int func)
        {
      !     if(ops['f'] && ops['u']) {
      ! 	zerrnam(name, "illegal combination of options", NULL, 0);
      ! 	return 1;
      !     } else if (ops['f'])
        	ttyfrozen = 1;
      !     else if (ops['u'])
        	ttyfrozen = 0;
      +     else if (ops['M'])
      + 	printf("ttyctl -%c\n", ttyfrozen ? 'f' : 'u');
      +     else
      + 	printf("tty is %sfrozen\n", ttyfrozen ? "" : "not ");
            return 0;
        }
        
      *** 1.2	1996/01/07 02:09:24
      --- Src/hashtable.h	1996/01/08 05:58:54
      ***************
      *** 304,310 ****
            {NULL, "source", 0, bin_dot, 1, -1, 0, NULL, NULL},
            {NULL, "suspend", 0, bin_suspend, 0, 0, 0, "f", NULL},
            {NULL, "test", 0, bin_test, 0, -1, BIN_TEST, NULL, NULL},
      !     {NULL, "ttyctl", 0, bin_ttyctl, 0, 0, 0, "fu", NULL},
            {NULL, "times", 0, bin_times, 0, 0, 0, NULL, NULL},
            {NULL, "trap", 0, bin_trap, 0, -1, 0, NULL, NULL},
            {NULL, "true", 0, bin_true, 0, -1, 0, NULL, NULL},
      --- 304,310 ----
            {NULL, "source", 0, bin_dot, 1, -1, 0, NULL, NULL},
            {NULL, "suspend", 0, bin_suspend, 0, 0, 0, "f", NULL},
            {NULL, "test", 0, bin_test, 0, -1, BIN_TEST, NULL, NULL},
      !     {NULL, "ttyctl", 0, bin_ttyctl, 0, 0, 0, "fuM", NULL},
            {NULL, "times", 0, bin_times, 0, 0, 0, NULL, NULL},
            {NULL, "trap", 0, bin_trap, 0, -1, 0, NULL, NULL},
            {NULL, "true", 0, bin_true, 0, -1, 0, NULL, NULL},
      *** 1.2	1996/01/07 02:09:24
      --- Doc/zshbuiltins.man	1996/01/08 06:17:20
      ***************
      *** 852,866 ****
        \fBtrue\fP
        Do nothing and return an exit code of 0.
        .TP
      ! \fBttyctl\fP \-\fBfu\fP
        The \-\fBf\fP option freezes the tty, and \-\fBu\fP unfreezes it.
        When the tty is frozen, no changes made to the tty settings by
        external programs will be honored by the shell, except for changes in the
        size of the screen; the shell will
        simply reset the settings to their previous values as soon as each
      ! command exits or is suspended.  Thus, \fBstty\fP and similar programs have
      ! no effect when the tty is frozen. Without options it reports whether the
      ! terminal is frozen or not.
        .TP
        \fBtype\fP
        Same as \fBwhence\fP \-\fBv\fP.
      --- 852,867 ----
        \fBtrue\fP
        Do nothing and return an exit code of 0.
        .TP
      ! \fBttyctl\fP \-\fBfuM\fP
        The \-\fBf\fP option freezes the tty, and \-\fBu\fP unfreezes it.
        When the tty is frozen, no changes made to the tty settings by
        external programs will be honored by the shell, except for changes in the
        size of the screen; the shell will
        simply reset the settings to their previous values as soon as each
      ! command exits or is suspended.  Thus, \fIstty\fR(1) and similar programs have
      ! no effect when the tty is frozen.  Without options it reports whether the
      ! terminal is frozen or not; with the \-\fBM\fP option alone it reports this
      ! in the form of a \fBttyctl\fP command.
        .TP
        \fBtype\fP
        Same as \fBwhence\fP \-\fBv\fP.

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