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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2022 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "drivers.h"
typedef enum {
PARM_MESSAGE
} ScreenParameters;
#define SCRPARMS "message"
#define SCRSYMBOL noScreen
#define DRIVER_NAME NoScreen
#define DRIVER_CODE no
#define DRIVER_COMMENT "no screen support"
#define DRIVER_VERSION ""
#define DRIVER_DEVELOPERS ""
#include "scr_driver.h"
#include "scr.auto.h"
static const char defaultMessage[] = strtext("no screen");
static const char *messageParameter = NULL;
static const char *noDriverReason = NULL;
static const char *screenMessage = NULL;
void
setNoScreenDriverReason (const char *reason) {
noDriverReason = reason;
}
static int
processParameters_NoScreen (char **parameters) {
{
const char *message = parameters[PARM_MESSAGE];
if (message && !*message) message = NULL;
messageParameter = message;
}
return 1;
}
static void
releaseParameters_NoScreen (void) {
messageParameter = NULL;
}
static int
currentVirtualTerminal_NoScreen (void) {
return SCR_NO_VT;
}
static void
describe_NoScreen (ScreenDescription *description) {
{
const char *message = noDriverReason;
if (!message) {
message = messageParameter;
if (!message) message = defaultMessage;
message = gettext(message);
}
screenMessage = message;
}
if (screenMessage)
description->quality = SCQ_LOW;
else
description->quality = SCQ_NONE;
description->rows = 1;
description->cols = strlen(screenMessage);
description->posx = 0;
description->posy = 0;
description->number = currentVirtualTerminal_NoScreen();
}
static int
readCharacters_NoScreen (const ScreenBox *box, ScreenCharacter *buffer) {
ScreenDescription description;
describe_NoScreen(&description);
if (!validateScreenBox(box, description.cols, description.rows)) return 0;
setScreenMessage(box, buffer, screenMessage);
return 1;
}
static int
poll_NoScreen (void) {
return 0;
}
static void
scr_initialize (MainScreen *main) {
initializeMainScreen(main);
main->base.poll = poll_NoScreen;
main->base.describe = describe_NoScreen;
main->base.readCharacters = readCharacters_NoScreen;
main->base.currentVirtualTerminal = currentVirtualTerminal_NoScreen;
main->processParameters = processParameters_NoScreen;
main->releaseParameters = releaseParameters_NoScreen;
}
const ScreenDriver *screen = &noScreen;
int
haveScreenDriver (const char *code) {
return haveDriver(code, SCREEN_DRIVER_CODES, driverTable);
}
const char *
getDefaultScreenDriver (void) {
return getDefaultDriver(driverTable);
}
const ScreenDriver *
loadScreenDriver (const char *code, void **driverObject, const char *driverDirectory) {
return loadDriver(code, driverObject,
driverDirectory, driverTable,
"screen", 'x', "scr",
&noScreen, &noScreen.definition);
}
void
identifyScreenDriver (const ScreenDriver *driver, int full) {
identifyDriver("Screen", &driver->definition, full);
}
void
identifyScreenDrivers (int full) {
const DriverEntry *entry = driverTable;
while (entry->address) {
const ScreenDriver *driver = entry++->address;
identifyScreenDriver(driver, full);
}
}
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