From d09860faff8dac4c63db6e22eeb556a15c2ffaeb Mon Sep 17 00:00:00 2001
From: Timothy Pearson <kb9vqf@pearsoncomputing.net>
Date: Thu, 21 Mar 2013 16:20:15 -0500
Subject: Add unpaged memory mode to TQString and TQLineEdit Fix designer build
 warnings

---
 src/widgets/qlineedit.cpp | 46 +++++++++++++++++++++++++++++++++++++++-------
 src/widgets/qlineedit.h   |  2 +-
 2 files changed, 40 insertions(+), 8 deletions(-)

(limited to 'src/widgets')

diff --git a/src/widgets/qlineedit.cpp b/src/widgets/qlineedit.cpp
index d786829..2a71656 100644
--- a/src/widgets/qlineedit.cpp
+++ b/src/widgets/qlineedit.cpp
@@ -63,6 +63,9 @@
 #include "../kernel/qinternal_p.h"
 #include "private/qtextlayout_p.h"
 #include "qvaluevector.h"
+#if defined(Q_OS_LINUX)
+#include <sys/mman.h>
+#endif
 #if defined(QT_ACCESSIBILITY_SUPPORT)
 #include "qaccessible.h"
 #endif
@@ -74,6 +77,11 @@
 #define ACCEL_KEY(k) "\t" + QString("Ctrl+" #k)
 #endif
 
+#if defined(Q_OS_LINUX)
+#define LINUX_MEMLOCK_LIMIT_BYTES 16384
+#define LINUX_MEMLOCK_LIMIT_CHARACTERS LINUX_MEMLOCK_LIMIT_BYTES/sizeof(QChar)
+#endif
+
 #define innerMargin 1
 
 struct QLineEditPrivate : public Qt
@@ -451,6 +459,10 @@ QLineEdit::QLineEdit( const QString& contents, const QString &inputMask, QWidget
 
 QLineEdit::~QLineEdit()
 {
+    if ((d->echoMode == NoEcho) || (d->echoMode == Password) || (d->echoMode == PasswordThreeStars)) {
+	d->text.fill(QChar(0));
+	munlock(d->text.d->unicode, LINUX_MEMLOCK_LIMIT_BYTES);
+    }
     delete [] d->maskData;
     delete d;
 }
@@ -500,11 +512,16 @@ void QLineEdit::setText( const QString& text)
 
 QString QLineEdit::displayText() const
 {
-    if ( d->echoMode == NoEcho )
+    if ( d->echoMode == NoEcho ) {
 	return QString::fromLatin1("");
+    }
     QString res = d->text;
-    if ( d->echoMode == Password )
+    if ( d->echoMode == Password ) {
 	res.fill( passwordChar() );
+    }
+    else if ( d->echoMode == PasswordThreeStars ) {
+	res.fill( passwordChar(), res.length()*3 );
+    }
     return ( res.isNull() ? QString::fromLatin1("") : res );
 }
 
@@ -598,11 +615,26 @@ QLineEdit::EchoMode QLineEdit::echoMode() const
 
 void QLineEdit::setEchoMode( EchoMode mode )
 {
-    if (mode == (EchoMode)d->echoMode)
+    if (mode == (EchoMode)d->echoMode) {
 	return;
+    }
+#if defined(Q_OS_LINUX)
+    if (((mode == NoEcho) || (mode == Password) || (mode == PasswordThreeStars)) && ((EchoMode)d->echoMode == Normal)) {
+    	if ((uint)d->maxLength > (LINUX_MEMLOCK_LIMIT_CHARACTERS-1)) {
+	    d->maxLength = LINUX_MEMLOCK_LIMIT_CHARACTERS-1;
+    	}
+        d->text.reserve(LINUX_MEMLOCK_LIMIT_CHARACTERS);
+        mlock(d->text.d->unicode, LINUX_MEMLOCK_LIMIT_BYTES);
+        d->text.setSecurityUnPaged(true);
+    }
+    else {
+        d->text.setSecurityUnPaged(false);
+        munlock(d->text.d->unicode, LINUX_MEMLOCK_LIMIT_BYTES);
+    }
+#endif
     d->echoMode = mode;
     d->updateTextLayout();
-    setInputMethodEnabled( mode == Normal );
+    setInputMethodEnabled( ( mode == Normal ) || ( mode == Password) );
     update();
 }
 
@@ -1688,12 +1720,12 @@ void QLineEdit::keyPressEvent( QKeyEvent * e )
 	case Key_Right:
 	case Key_Left:
 	    if ( d->isRightToLeft() == (e->key() == Key_Right) ) {
-	        if ( echoMode() == Normal )
+	        if (( echoMode() == Normal ) || ( echoMode() == Password ))
 		    cursorWordBackward( e->state() & ShiftButton );
 		else
 		    home( e->state() & ShiftButton );
 	    } else {
-		if ( echoMode() == Normal )
+		if (( echoMode() == Normal ) || ( echoMode() == Password ))
 		    cursorWordForward( e->state() & ShiftButton );
 		else
 		    end( e->state() & ShiftButton );
@@ -2069,7 +2101,7 @@ void QLineEdit::drawContents( QPainter *p )
     // Asian users regard IM selection text as cursor on candidate
     // selection phase of input method, so ordinary cursor should be
     // invisible if IM selection text exists.
-    if ( d->cursorVisible && !supressCursor && !d->hasIMSelection() ) {
+    if ( d->cursorVisible && !supressCursor && !d->hasIMSelection() && (d->echoMode != PasswordThreeStars) ) {
 	QPoint from( topLeft.x() + cix, lineRect.top() );
 	QPoint to = from + QPoint( 0, lineRect.height() );
 	p->drawLine( from, to );
diff --git a/src/widgets/qlineedit.h b/src/widgets/qlineedit.h
index 3778e2a..b7e0fb8 100644
--- a/src/widgets/qlineedit.h
+++ b/src/widgets/qlineedit.h
@@ -94,7 +94,7 @@ public:
 
     bool frame() const;
 
-    enum EchoMode { Normal, NoEcho, Password };
+    enum EchoMode { Normal, NoEcho, Password, PasswordThreeStars };
     EchoMode echoMode() const;
 
     bool isReadOnly() const;
-- 
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