/*+
 *	$Header: /home/vikas/src/nocol/netconsole/RCS/netconsole.c,v 2.8 1999/11/01 05:39:37 vikas Exp $
 */

/*
 *
 * To DISPLAY the output from various NOCOL monitoring programs.
 * Uses curses for screen management and display.
 *
 * The design of the program is such that it displays ALL the files in
 * the DATA directory one after another in a cycle. As an option , the
 * data directory can be displayed on the command line.
 *
 * A separate window for the events and another for the messages are
 * created. The message window can scroll and is for sending debug or
 * any other messages that might be needed in the future. A separate
 * routine 'msg_dpy' is called for the message 's display.
 *
 * AUTHOR:
 *
 *	Vikas Aggarwal, vikas@navya.com
 *
 */

/* Copyright 1992 JvNCnet */
/* Copyright 1994 Vikas Aggarwal, vikas@navya.com */


/*
 * $Log: netconsole.c,v $
 * Revision 2.8  1999/11/01 05:39:37  vikas
 * Added -T cmd line option to specify terminal type.
 *
 * Revision 2.7  1998/08/13 15:30:16  vikas
 * Added environment variable NOCOL_SEVERITY checking (jonz@netrail.net)
 *
 * Revision 2.6  1998/07/31 18:22:48  vikas
 * Added INTSIGNALS
 *
 * Revision 2.5  1994/11/29 20:40:34  vikas
 * Updated as netconsole for v4.0
 *
 * Revision 2.4  1994/06/12  18:09:35  vikas
 * Deleted the 'options' variable and set debug/quiet/emode to
 * be simple integers instead.
 *
 * Revision 2.2  1994/01/18  18:01:38  aggarwal
 * Added 'silent' option to prevent *any* form of beeping. Command line
 * flag only.
 *
 * Revision 2.1  1993/10/30  03:53:11  aggarwal
 * Fixed the definitions of the signal handlers
 *
 * Revision 2.0  1992/06/18  21:05:21  aggarwal
 * Additional features for releasing:
 * 	o window resizing
 * 	o terminal setup
 *
 * Revision 1.8  1992/05/14  12:34:41  aggarwal
 * Number of major fixes:
 * 	- moved get_reply() to above main so types were defined
 * 	  before being called in 'main()'
 * 	- setuserenviron() sprintf was missing terminal '\0'
 * 	- set_terminal() extensively modified.
 *
 * Revision 1.4  1990/04/05  17:47:02  aggarwal
 * Was doing a 'endwin()' in Error even though initscr() had not been
 * called. Got rid of that. Extended the help a bit.
 *
 * Revision 1.1  90/03/09  13:06:18  aggarwal
 * Initial revision
 * 
 */
#ifndef lint
 static char rcsid[] = "$RCSfile: netconsole.c,v $ $Revision: 2.8 $ $Date: 1999/11/01 05:39:37 $" ;
#endif

/*+ 
 ** INCLUDES
 */

#include	"netconsole.h"			/* application specific	*/

/*
 * global variables
 */
char *good_terminals[] = { GOODTERMINALS, "" } ;
char *bad_terminals[] =  { BADTERMINALS,  "" } ;

main (ac, av)
     int	ac;
     char	**av;
{
    extern	char *optarg;
    extern 	int optind;
    register 	int i ;				/* temporary counter	*/
    void	done(), wsizechange();		/* for signals		*/
    char	*envlevel;
    char	term[MAXLINE];

#ifdef  _NOCOLVERSION_
    fprintf (stderr, "NOCOL version %s\n\n", nocol_version);
    fflush (stderr);
#endif

    /*
     * Set the initial values of variables
     */
    prognm = av[0] ;				/* program name		*/
    datadir = DATADIR ;
    msgsdir = MSGSDIR ;
    helpfile = HELPFILE ;
    eventsz = 0;				/* Init value important	*/
    page = 1;					/* init value */
    level = E_CRITICAL;				/* default severity	*/
    term[0] = '\0';

    /* allow environment variable to set the default display level */
    if ( (envlevel = (char *)getenv("NOCOL_SEVERITY")) != NULL)
    {
      switch (*envlevel)
      {
      case 'C': case 'c':
	level = E_CRITICAL ; break;
      case 'E': case 'e':
	level = E_ERROR; break;
      case 'W': case 'w':
	level = E_WARNING; break;
      case 'I': case 'i':
	level = E_INFO; break;
      }
    }

    while ((i = getopt(ac, av, "dewl:qsT:")) != EOF)
      switch (i)
      {
       case 'd':
	  debug = 1;				/* debug */
	  break ;
       case 'w':
       case 'e':			   	/* expanded/wide  display */
	  emode = 1;
	  break;
       case 'l':				/* level	*/
	  sscanf(optarg, "%d", &level) ;
	  break;
       case 'q':				/* no initial beep */
	  quiet = 1;
	  break ;
       case 's':			  	/* never beep */
	  silent = 1;
	  break;
       case 'T':
	 strncpy(term, optarg, sizeof(term));	/* cmd line term type */
	 break;
       case '?':
       default:
	  fprintf(stderr, "%s: unknown flag: %c\n", prognm, i);
	  goto Error ;
      }			/* end   switch		*/

    switch ( ac - optind )
    {
     case 0:					/* default data dir */
	break ;
     case 1:
	datadir = av[optind] ;			/* alternate data dir */
	break ;
     default:
	goto Error;				/* more than one data dir */
    }

    /*
     * Setup to catch ALL signals except SIGUSR1/SIGUSR2 for security
     * purposes.
     */
    for (i = 0 ; i < SIGUSR1 ; ++i )
      signal (i, done);

    if (setuserenviron(term) == -1)	/* check the user environment	*/
    {					/* .. specifically for TERM	*/
	perror ("setuserenv");
	exit (1);
    }

    all_doer();				/* the main do'er	*/

    if (entered_curses)
      endwin ();			/* This point never reached */
    perror (prognm);
    exit (1);			

  Error:
    usage ();					/* No 'endwin' here */
    exit (1);
}						/* end    'main'	*/


/*+ 		usage
** FUNCTION
**	Display short message on usage of the program
**/

#ifndef Fprintf
#define Fprintf(s)	fprintf(stderr, s )
#endif

usage()
{
    static char 
      usage[]="[-d (debug)] [-q (quiet)] [-l level] [-w (wide)] [-s (silent)] [-T termtype] [data dir]";
    fprintf (stderr, "\nUSAGE: %s  %s\n\n", prognm, usage);
    fprintf(stderr, "Data directory is: %s\n", datadir);
    Fprintf("To verify terminal type, turn debug mode on and\n");
    Fprintf("then toggle between wide display mode (using w)\n");
    Fprintf("You can set your shell environment variable NOCOL_SEVERITY \n");
    Fprintf("to the initial desired level (Critical, Error, Warning, Info)\n");
    Fprintf("\n");
    return (0);
}		/* end usage()	*/

/*+ 		wsizechange
 ** FUNCTION:
 ** 	Function to catch window size change signals (in xterm, etc.)
 ** After getting the signal, the system blocks all further occurences of
 ** the signal until the function returns. However, if calling all_doer,
 ** this function never really returns, but calls all_doer() directly.
 ** So remember to unblock the SIGWINCH in case calling all_doer directly.
 **/
void  wsizechange()
{
#ifdef TIOCGWINSZ
    static struct winsize win ;         	/* 4.3 BSD window sizing */
#endif

#ifdef TIOCGWINSZ
    if (ioctl(1, TIOCGWINSZ, (char *) &win) == 0 )
    {
        if (win.ws_row > 0)
	  LINES = win.ws_row ;
        if (win.ws_col > 0)
	  COLS = win.ws_col ;
    }
#endif

    if (entered_curses)
    {
	endwin() ;			/* get out of curses and start over */
	tputs(clscr, 1, outchar);	/* clear the screen */
	fflush(stdout);
    }

    /*
     *  Now reset any special variables for setup_display() and return.
     *  If calling 'all_doer' (doesn't return), remember to reset signal
     */
    eventsz = 0 ;			/* so that new size is reset */
    setup_display() ;
    display_screenful() ;		/* put stuff back on screen */

}		/* end wsizechange */


/*+ 		all_doer
** FUNCTION:
** 	This is the main doer. It creates all the necessary windows
** and then repeatedly calls the 'build_display()' routine to display
** all the data. This is made as a separate routine from main so that
** options can be changed and this function can be called directly
** without going thru main() again.
**/

all_doer()
{
    entered_curses = 1 ;		/* so done can call endwin() */

#ifdef SIGWINCH				/* catch window size change signals */
# ifdef INTSIGNALS
    if (signal(SIGWINCH, wsizechange) == (void *)-1)
      perror("couldn't set signal for SIGWINCH- ");
# else
    signal(SIGWINCH, wsizechange);
# endif
#endif

    setup_display();			/* Just creates all the windows	*/
    return (build_display());		/* Display all files forever	*/

}	/* end:  all_doer()  */


/*+ 		done
** FUNCTION
**	Close up and die.
**/

void done()
{
    echo();
    if (entered_curses)			/* else kills the login window */
      endwin();
    printf ("\n\n");
    exit(0);
}