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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) 1995-2025 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 "log.h"
#include "strfmt.h"
#include "io_generic.h"
#include "gio_internal.h"
#include "parse.h"
struct GioHandleStruct {
int place_holder;
};
static int
disconnectNullResource (GioHandle *handle) {
free(handle);
return 1;
}
static const char *
makeNullResourceIdentifier (GioHandle *handle, char *buffer, size_t size) {
STR_BEGIN(buffer, size);
STR_PRINTF("%s%c", "null", PARAMETER_QUALIFIER_CHARACTER);
STR_END;
return buffer;
}
static ssize_t
writeNullData (GioHandle *handle, const void *data, size_t size, int timeout) {
return size;
}
static int
awaitNullInput (GioHandle *handle, int timeout) {
return 1;
}
static ssize_t
readNullData (
GioHandle *handle, void *buffer, size_t size,
int initialTimeout, int subsequentTimeout
) {
return 0;
}
static int
monitorNullInput (GioHandle *handle, AsyncMonitorCallback *callback, void *data) {
return 1;
}
static const GioHandleMethods gioNullMethods = {
.disconnectResource = disconnectNullResource,
.makeResourceIdentifier = makeNullResourceIdentifier,
.writeData = writeNullData,
.awaitInput = awaitNullInput,
.readData = readNullData,
.monitorInput = monitorNullInput
};
static int
testNullIdentifier (const char **identifier) {
return hasQualifier(identifier, "null");
}
static const GioPublicProperties gioPublicProperties_null = {
.testIdentifier = testNullIdentifier,
.type = {
.name = "null",
.identifier = GIO_TYPE_NULL
}
};
static int
isNullSupported (const GioDescriptor *descriptor) {
return 1;
}
static const GioOptions *
getNullOptions (const GioDescriptor *descriptor) {
return &descriptor->null.options;
}
static const GioHandleMethods *
getNullMethods (void) {
return &gioNullMethods;
}
static GioHandle *
connectNullResource (
const char *identifier,
const GioDescriptor *descriptor
) {
GioHandle *handle = malloc(sizeof(*handle));
if (handle) {
memset(handle, 0, sizeof(*handle));
return handle;
} else {
logMallocError();
}
return NULL;
}
static const GioPrivateProperties gioPrivateProperties_null = {
.isSupported = isNullSupported,
.getOptions = getNullOptions,
.getHandleMethods = getNullMethods,
.connectResource = connectNullResource
};
const GioProperties gioProperties_null = {
.public = &gioPublicProperties_null,
.private = &gioPrivateProperties_null
};
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