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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) 1995-2014 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 <string.h>
#include "message.h"
#include "defaults.h"
#include "async_wait.h"
#include "async_task.h"
#include "charset.h"
#include "brl_utils.h"
#include "spk.h"
#include "ktb_types.h"
#include "update.h"
#include "cmd_queue.h"
#include "api_control.h"
#include "brltty.h"
int messageHoldTimeout = DEFAULT_MESSAGE_HOLD_TIMEOUT;
typedef struct {
unsigned endWait:1;
} MessageData;
ASYNC_CONDITION_TESTER(testEndMessageWait) {
MessageData *mgd = data;
return mgd->endWait;
}
static int
handleMessageCommands (int command, void *data) {
MessageData *mgd = data;
mgd->endWait = 1;
return 1;
}
typedef struct {
const char *mode;
MessageOptions options;
unsigned presented:1;
unsigned deallocate:1;
char text[0];
} MessageParameters;
ASYNC_TASK_CALLBACK(presentMessage) {
MessageParameters *mgp = data;
#ifdef ENABLE_SPEECH_SUPPORT
if (!(mgp->options & MSG_SILENT)) {
if (autospeak()) {
sayString(mgp->text, SAY_OPT_MUTE_FIRST);
}
}
#endif /* ENABLE_SPEECH_SUPPORT */
if (canBraille()) {
MessageData mgd;
size_t size = textCount * brl.textRows;
wchar_t buffer[size];
size_t length = getTextLength(mgp->text);
wchar_t characters[length + 1];
const wchar_t *character = characters;
int apiWasStarted = apiStarted;
apiUnlink();
apiStarted = 0;
convertTextToWchars(characters, mgp->text, ARRAY_COUNT(characters));
suspendUpdates();
pushCommandEnvironment("message", NULL, NULL);
pushCommandHandler("message", KTB_CTX_WAITING,
handleMessageCommands, NULL, &mgd);
while (length) {
size_t count;
/* strip leading spaces */
while (iswspace(*character)) {
character += 1;
length -= 1;
}
if (length <= size) {
count = length; /* the whole message fits in the braille window */
} else {
/* split the message across multiple windows on space characters */
for (count=size-2; count>0 && iswspace(characters[count]); count-=1);
count = count? count+1: size-1;
}
wmemcpy(buffer, character, count);
character += count;
if (length -= count) {
while (count < size) buffer[count++] = WC_C('-');
buffer[count - 1] = WC_C('>');
}
if (!writeBrailleCharacters(mgp->mode, buffer, count)) {
mgp->presented = 0;
break;
}
{
int delay = messageHoldTimeout - brl.writeDelay;
mgd.endWait = 0;
drainBrailleOutput(&brl, 0);
if (length || !(mgp->options & MSG_NODELAY)) {
if (delay < 0) delay = 0;
while (!asyncAwaitCondition(delay, testEndMessageWait, &mgd)) {
if (!(mgp->options & MSG_WAITKEY)) break;
}
}
}
}
popCommandEnvironment();
resumeUpdates(1);
apiStarted = apiWasStarted;
apiLink();
}
if (mgp->deallocate) free(mgp);
}
int
message (const char *mode, const char *text, MessageOptions options) {
int presented = 0;
MessageParameters *mgp;
size_t size = sizeof(*mgp) + strlen(text);
if ((mgp = malloc(size))) {
memset(mgp, 0, size);
mgp->mode = mode? mode: "";
mgp->options = options;
mgp->presented = 1;
strcpy(mgp->text, text);
if (mgp->options & MSG_SYNC) {
mgp->deallocate = 0;
presentMessage(mgp);
if (mgp->presented) presented = 1;
} else {
mgp->deallocate = 1;
if (asyncAddTask(NULL, presentMessage, mgp)) return 1;
}
free(mgp);
}
return presented;
}
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