Print the QStorageInfo dump on test start

So we know what we're looking at if there's a test failure. This is like
QNetworkInterface.

Change-Id: Id75834dab9ed466e94c7ffff1444bf51f615e944
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

tests/auto/corelib/io/qstorageinfo/tst_qstorageinfo.cpp

@@ -32,14 +32,18 @@
 ****************************************************************************/
 
 #include <QtTest/QtTest>
-
 #include <QStorageInfo>
 
+#include <stdarg.h>
+
+#include "../../../../manual/qstorageinfo/printvolumes.cpp"
+
 class tst_QStorageInfo : public QObject
 {
     Q_OBJECT
 private slots:
     void defaultValues();
+    void dump();
     void operatorEqual();
 #ifndef Q_OS_WINRT
     void operatorNotEqual();
@@ -66,6 +70,33 @@ void tst_QStorageInfo::defaultValues()
     QVERIFY(storage.bytesAvailable() == -1);
 }
 
+static int qInfoPrinter(const char *format, ...)
+{
+    static char buf[1024];
+    static size_t bufuse = 0;
+
+    va_list ap;
+    va_start(ap, format); // use variable arg list
+    int n = qvsnprintf(buf + bufuse, sizeof(buf) - bufuse, format, ap);
+    va_end(ap);
+
+    bufuse += n;
+    if (bufuse >= sizeof(buf) - 1 || format[strlen(format) - 1] == '\n') {
+        // flush
+        QtMessageHandler qt_message_print = qInstallMessageHandler(0);
+        qInstallMessageHandler(qt_message_print);   // restore the handler
+        qt_message_print(QtInfoMsg, QMessageLogContext(), QString::fromLocal8Bit(buf));
+        bufuse = 0;
+    }
+
+    return 1;
+}
+
+void tst_QStorageInfo::dump()
+{
+    printVolumes(QStorageInfo::mountedVolumes(), qInfoPrinter);
+}
+
 void tst_QStorageInfo::operatorEqual()
 {
     {

tests/manual/qstorageinfo/main.cpp

@@ -32,10 +32,11 @@
 ****************************************************************************/
 
 #include <QtCore/QCoreApplication>
-#include <QtCore/QStorageInfo>
 
 #include <stdio.h>
 
+#include "printvolumes.cpp"
+
 int main(int argc, char *argv[])
 {
     QCoreApplication a(argc, argv);
@@ -57,26 +58,7 @@ int main(int argc, char *argv[])
     if (volumes.isEmpty())
         volumes = QStorageInfo::mountedVolumes();
 
-    // Sample output:
+    printVolumes(volumes, printf);
-    //  Filesystem (Type)            Size  Available BSize  Label            Mounted on
-    //  /dev/sda2 (ext4)    RO     388480     171218  1024                   /boot
-    //  /dev/mapper/system-root (btrfs) RW
-    //                          214958080   39088272  4096                   /
-    //  /dev/disk1s2 (hfs)  RW  488050672  419909696  4096  Macintosh HD2    /Volumes/Macintosh HD2
-
-    printf("Filesystem (Type)            Size  Available BSize  Label            Mounted on\n");
-    foreach (const QStorageInfo &info, volumes) {
-        QByteArray fsAndType = info.device();
-        if (info.fileSystemType() != fsAndType)
-            fsAndType += " (" + info.fileSystemType() + ')';
-
-        printf("%-19s R%c ", fsAndType.constData(), info.isReadOnly() ? 'O' : 'W');
-        if (fsAndType.size() > 19)
-            printf("\n%23s", "");
-
-        printf("%10llu %10llu %5u  ", info.bytesTotal() / 1024, info.bytesFree() / 1024, info.blockSize());
-        printf("%-16s %s\n", qPrintable(info.name()), qPrintable(info.rootPath()));
-    }
 
     return 0;
 }

tests/manual/qstorageinfo/printvolumes.cpp

@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 Intel Corporation
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore/QStorageInfo>
+
+void printVolumes(const QList<QStorageInfo> &volumes, int (*printer)(const char *, ...))
+{
+    // Sample output:
+    //  Filesystem (Type)            Size  Available BSize  Label            Mounted on
+    //  /dev/sda2 (ext4)    RO     388480     171218  1024                   /boot
+    //  /dev/mapper/system-root (btrfs) RW
+    //                          214958080   39088272  4096                   /
+    //  /dev/disk1s2 (hfs)  RW  488050672  419909696  4096  Macintosh HD2    /Volumes/Macintosh HD2
+
+    printf("Filesystem (Type)            Size  Available BSize  Label            Mounted on\n");
+    foreach (const QStorageInfo &info, volumes) {
+        QByteArray fsAndType = info.device();
+        if (info.fileSystemType() != fsAndType)
+            fsAndType += " (" + info.fileSystemType() + ')';
+
+        printf("%-19s R%c ", fsAndType.constData(), info.isReadOnly() ? 'O' : 'W');
+        if (fsAndType.size() > 19)
+            printf("\n%23s", "");
+
+        printf("%10llu %10llu %5u  ", info.bytesTotal() / 1024, info.bytesFree() / 1024, info.blockSize());
+        printf("%-16s %s\n", qPrintable(info.name()), qPrintable(info.rootPath()));
+    }
+}