WinRT: Fix argument handling on Windows 10

The Windows 10 CRT does not export __getmainargs(), so we need to move
to GetCommandLine like on WinCE and desktop Windows. As CommandLineToArgv
is not available, the command line is split according by spaces, allowing
for quotes (and quote escaping) around arguments.

Change-Id: Ibc969df94ca5423a3a71d8190bbacd201189ea19
Reviewed-by: Andrew Knight <andrew.knight@intopalo.com>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@theqtcompany.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/src/winmain/qtmain_winrt.cpp b/src/winmain/qtmain_winrt.cpp
index 5a44df622a..e68da520e7 100644
--- a/src/winmain/qtmain_winrt.cpp
+++ b/src/winmain/qtmain_winrt.cpp
@@ -222,11 +222,49 @@ private:
 // Main entry point for Appx containers
 int __stdcall WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
 {
+#if _MSC_VER < 1900
     int argc = 0;
     char **argv, **env;
     _startupinfo info = { _query_new_mode() };
     if (int init = __getmainargs(&argc, &argv, &env, false, &info))
         return init;
+#else
+    QByteArray commandLine = QString::fromWCharArray(GetCommandLine()).toUtf8();
+    QVarLengthArray<char *> args;
+    args.append(commandLine.data());
+    bool quote = false;
+    bool escape = false;
+    for (int i = 0; i < commandLine.size(); ++i) {
+        switch (commandLine.at(i)) {
+        case '\\':
+            escape = true;
+            break;
+        case '"':
+            if (escape) {
+                escape = false;
+                break;
+            }
+            quote = !quote;
+            commandLine[i] = '\0';
+            break;
+        case ' ':
+            if (quote)
+                break;
+            commandLine[i] = '\0';
+            if (args.last()[0] != '\0')
+                args.append(commandLine.data() + i + 1);
+            // fall through
+        default:
+            if (args.last()[0] == '\0')
+                args.last() = commandLine.data() + i;
+            escape = false; // only quotes are escaped
+            break;
+        }
+    }
+    int argc = args.size();
+    char **argv = args.data();
+    char **env = Q_NULLPTR;
+#endif // _MSC_VER >= 1900
 
     for (int i = 0; env && env[i]; ++i) {
         QByteArray var(env[i]);