Port qenvironmentvariables.cpp to qsizetype

I don't expect environments to allow values or names > 2 Gi
characters, so this is just for consistency (int is a code smell these
days).

As a drive-by, replace

   QString buffer;
   buffer.resize(n);

with

  QString buffer(n, Qt::Uninitialized);

Task-number: QTBUG-103527
Change-Id: I0e41a6e7e9c44ff1ec22377329735538d5f95181
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit c25cc34a05c0838052b9a5d6624336ef2a2ae8ea)
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>

1 files changed, 4 insertions, 5 deletions

diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp
index 4b74dd17c2..30d3341318 100644
--- a/src/corelib/global/qglobal.cpp
+++ b/src/corelib/global/qglobal.cpp
@@ -3439,7 +3439,7 @@ QByteArray qgetenv(const char *varName)
     getenv_s(&requiredSize, 0, 0, varName);
     if (requiredSize == 0)
         return buffer;
-    buffer.resize(int(requiredSize));
+    buffer.resize(qsizetype(requiredSize));
     getenv_s(&requiredSize, buffer.data(), requiredSize, varName);
     // requiredSize includes the terminating null, which we don't want.
     Q_ASSERT(buffer.endsWith('\0'));
@@ -3500,15 +3500,14 @@ QString qEnvironmentVariable(const char *varName, const QString &defaultValue)
 {
 #if defined(Q_OS_WIN)
     const auto locker = qt_scoped_lock(environmentMutex);
-    QVarLengthArray<wchar_t, 32> wname(int(strlen(varName)) + 1);
-    for (int i = 0; i < wname.size(); ++i) // wname.size() is correct: will copy terminating null
+    QVarLengthArray<wchar_t, 32> wname(qsizetype(strlen(varName)) + 1);
+    for (qsizetype i = 0; i < wname.size(); ++i) // wname.size() is correct: will copy terminating null
         wname[i] = uchar(varName[i]);
     size_t requiredSize = 0;
-    QString buffer;
     _wgetenv_s(&requiredSize, 0, 0, wname.data());
     if (requiredSize == 0)
         return defaultValue;
-    buffer.resize(int(requiredSize));
+    QString buffer(qsizetype(requiredSize), Qt::Uninitialized);
     _wgetenv_s(&requiredSize, reinterpret_cast<wchar_t *>(buffer.data()), requiredSize,
                wname.data());
     // requiredSize includes the terminating null, which we don't want.