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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) 1995-2024 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 <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include "log.h"
#include "scr_terminal.h"
int
makeTerminalKey (key_t *key, const char *path) {
key_t result = ftok(path, 't');
int gotKey = result != -1;
if (gotKey) {
*key = result;
} else {
logSystemError("ftok");
}
return gotKey;
}
int
getMessageQueue (int *queue, key_t key) {
int result = msgget(key, 0);
int foundQueue = result != -1;
if (foundQueue) {
*queue = result;
} else if (errno != ENOENT) {
logSystemError("msgget");
}
return foundQueue;
}
int
getScreenSegment (int *identifier, key_t key) {
int result = shmget(key, 0, 0);
int foundSegment = result != -1;
if (foundSegment) {
*identifier = result;
} else if (errno != ENOENT) {
logSystemError("shmget");
}
return foundSegment;
}
ScreenSegmentHeader *
attachScreenSegment (int identifier) {
void *address = shmat(identifier, NULL, 0);
if (address != (void *)-1) return address;
logSystemError("shmat");
return NULL;
}
int
detachScreenSegment (ScreenSegmentHeader *segment) {
if (shmdt(segment) != -1) return 1;
logSystemError("shmdt");
return 0;
}
ScreenSegmentHeader *
getScreenSegmentForKey (key_t key) {
int identifier;
if (getScreenSegment(&identifier, key)) {
ScreenSegmentHeader *segment = attachScreenSegment(identifier);
if (segment) return segment;
}
return NULL;
}
ScreenSegmentHeader *
getScreenSegmentForPath (const char *path) {
key_t key;
if (!makeTerminalKey(&key, path)) return NULL;
return getScreenSegmentForKey(key);
}
void
logScreenSegment (const ScreenSegmentHeader *segment) {
const void *const address = segment;
const unsigned char *const bytes = address;
uint32_t offset = 0;
const uint32_t end = segment->segmentSize;
unsigned int increment = 0X10;
const int width = snprintf(NULL, 0, "%X", end);
while (offset < end) {
{
const uint32_t count = end - offset;
if (increment > count) increment = count;
}
logBytes(LOG_NOTICE, "screen segment: %0*X", &bytes[offset], increment, width, offset);
offset += increment;
}
}
void *
getScreenItem (ScreenSegmentHeader *segment, uint32_t offset) {
void *address = segment;
address += offset;
return address;
}
ScreenSegmentRow *
getScreenRowArray (ScreenSegmentHeader *segment) {
return getScreenItem(segment, segment->rowsOffset);
}
ScreenSegmentCharacter *
getScreenCharacterArray (ScreenSegmentHeader *segment, const ScreenSegmentCharacter **end) {
ScreenSegmentCharacter *array = getScreenItem(segment, segment->charactersOffset);
if (end) *end = array + getScreenCharacterCount(segment);
return array;
}
ScreenSegmentCharacter *
getScreenRow (ScreenSegmentHeader *segment, unsigned int row, const ScreenSegmentCharacter **end) {
void *address = segment;
if (haveScreenRowArray(segment)) {
address += getScreenRowArray(segment)[row].charactersOffset;
} else {
address += segment->charactersOffset;
address += row * getScreenRowWidth(segment);
}
if (end) {
*end = address + getScreenRowWidth(segment);
}
return address;
}
ScreenSegmentCharacter *
getScreenCharacter (ScreenSegmentHeader *segment, unsigned int row, unsigned int column, const ScreenSegmentCharacter **end) {
void *address = getScreenRow(segment, row, end);
address += column * segment->characterSize;
return address;
}
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