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/* This file is part of the Project Athena Zephyr Notification System.
* It is one of the source files comprising zwgc, the Zephyr WindowGram
* client.
*
* Created by: Marc Horowitz <marc@athena.mit.edu>
*
* $Id$
*
* Copyright (c) 1989 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
#if (!defined(lint) && !defined(SABER))
static char rcsid_display_c[] = "$Id$";
#endif
#include <zephyr/mit-copyright.h>
/****************************************************************************/
/* */
/* "Bus" module for plug in output driver modules: */
/* */
/****************************************************************************/
#include <sysdep.h>
#include "new_memory.h"
#include "new_string.h"
#include "variables.h"
#include "display.h"
/*
* driver_table - <<<>>>
*/
extern void tty_driver();
extern void plain_driver();
extern void raw_driver();
extern int tty_driver_init();
#ifndef X_DISPLAY_MISSING
extern int X_driver_init();
extern void X_driver();
#endif
static struct driver_info {
string driver_name;
void (*driver)();
int (*driver_init)();
void (*driver_reset)();
} driver_table[] = {
#ifndef X_DISPLAY_MISSING
{"X", X_driver, X_driver_init, X_driver_reset},
#endif
{"tty", tty_driver, tty_driver_init, NULL},
{"plain", plain_driver, NULL, NULL},
{"raw", raw_driver, NULL, NULL},
{NULL, NULL, NULL, NULL}
};
/*
* <<<>>>
*/
struct driver_info *get_driver_info(driver_name)
string driver_name;
{
struct driver_info *d;
for (d=driver_table; d->driver_name; d++)
if (string_Eq(d->driver_name, driver_name) && d->driver)
return(d);
return(NULL);
}
/*
* void init_display(int *pargc; char **argv)
* Effects: <<<>>>
*/
void display_init(pargc, argv)
int *pargc;
char **argv;
{
char **new, **current;
struct driver_info *d;
string first_working_driver = "";
string default_driver = "";
/*
* Process argument list handling "-disable <driver>" and
* "-default <driver>" arguments:
*/
for (new=current=argv+1; *current; current++) {
if (string_Eq(*current, "-disable")) {
current++; *pargc -= 2;
if (!*current)
usage();
if (d = get_driver_info(*current))
d->driver = NULL;
} else if (string_Eq(*current, "-default")) {
current++; *pargc -= 2;
if (!*current)
usage();
default_driver = *current;
} else
*(new++) = *current;
}
*new = *current;
/*
* Initialize all non-disabled drivers. If a driver reports an error,
* disable that driver. Set default_driver if not already set
* by the -default argument to the first non-disabled driver.
*/
for (d = driver_table; d->driver_name; d++) {
if (!d->driver)
continue;
if (d->driver_init && d->driver_init(pargc, argv)) {
d->driver = NULL;
continue;
}
if (!*first_working_driver)
first_working_driver = d->driver_name;
}
if (!get_driver_info(default_driver))
default_driver = first_working_driver;
var_set_variable("output_driver", default_driver);
}
void display_reset()
{
for (d = driver_table; d->driver_name; d++)
if (d->driver) d->driver_reset();
}
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