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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) 1995-2010 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <fcntl.h>
#include "device.h"
#include "log.h"
#include "file.h"
#include "misc.h"
int
getConsole (void) {
static int console = -1;
if (console == -1) {
if ((console = open("/dev/console", O_WRONLY)) != -1) {
LogPrint(LOG_DEBUG, "Console opened: fd=%d", console);
} else {
LogError("Console open");
}
}
return console;
}
int
writeConsole (const unsigned char *address, size_t count) {
int console = getConsole();
if (console != -1) {
if (write(console, address, count) != -1) {
return 1;
} else {
LogError("Console write");
}
}
return 0;
}
int
ringBell (void) {
static unsigned char bellSequence[] = {0X07};
return writeConsole(bellSequence, sizeof(bellSequence));
}
const char *
getDeviceDirectory (void) {
static const char *deviceDirectory = NULL;
if (!deviceDirectory) {
const char *directory = DEVICE_DIRECTORY;
const unsigned int directoryLength = strlen(directory);
static const char *const variables[] = {"DTDEVROOT", "UTDEVROOT", NULL};
const char *const*variable = variables;
while (*variable) {
const char *root = getenv(*variable);
if (root && *root) {
const unsigned int rootLength = strlen(root);
char path[rootLength + directoryLength + 1];
snprintf(path, sizeof(path), "%s%s", root, directory);
if (testPath(path)) {
deviceDirectory = strdupWrapper(path);
goto found;
}
if (errno != ENOENT)
LogPrint(LOG_ERR, "device directory error: %s (%s): %s",
path, *variable, strerror(errno));
}
++variable;
}
deviceDirectory = directory;
found:
LogPrint(LOG_DEBUG, "device directory: %s", deviceDirectory);
}
return deviceDirectory;
}
char *
getDevicePath (const char *device) {
const char *directory = getDeviceDirectory();
const unsigned int directoryLength = strlen(directory);
const unsigned int deviceLength = strlen(device);
if (directoryLength) {
if (*device != '/') {
char path[directoryLength + 1 + deviceLength + 1];
unsigned int length = 0;
memcpy(&path[length], directory, directoryLength);
length += directoryLength;
if (path[length-1] != '/') path[length++] = '/';
memcpy(&path[length], device, deviceLength);
length += deviceLength;
path[length] = 0;
return strdupWrapper(path);
}
}
return strdupWrapper(device);
}
const char *
resolveDeviceName (const char *const *names, const char *description, int mode) {
const char *first = *names;
const char *device = NULL;
const char *name;
while ((name = *names++)) {
char *path = getDevicePath(name);
if (!path) break;
LogPrint(LOG_DEBUG, "checking %s device: %s", description, path);
if (access(path, mode) != -1) {
device = name;
free(path);
break;
}
LogPrint(LOG_DEBUG, "%s device access error: %s: %s",
description, path, strerror(errno));
if (errno != ENOENT)
if (!device)
device = name;
free(path);
}
if (!device) {
if (first) {
device = first;
} else {
LogPrint(LOG_ERR, "%s device names not defined", description);
}
}
if (device) LogPrint(LOG_INFO, "%s device: %s", description, device);
return device;
}
int
isQualifiedDevice (const char **path, const char *qualifier) {
size_t count = strcspn(*path, ":");
if (count == strlen(*path)) return 0;
if (!qualifier) return 1;
if (!count) return 0;
{
int ok = strncasecmp(*path, qualifier, count) == 0;
if (ok) *path += count + 1;
return ok;
}
}
#ifdef ALLOW_DOS_DEVICE_NAMES
int
isDosDevice (const char *path, const char *prefix) {
size_t count = strcspn(path, ":");
size_t length = strlen(prefix);
if (length > count) return 0;
if (strncasecmp(path, prefix, length) != 0) return 0;
if (strspn(path+length, "0123456789") != (count - length)) return 0;
return 1;
}
#endif /* ALLOW_DOS_DEVICE_NAMES */
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