From 3b58fe4bde0722b352e4114adb992a2ed2c96423 Mon Sep 17 00:00:00 2001
From: Xaver Hugl <xaver.hugl@gmail.com>
Date: Sat, 7 May 2022 21:23:17 +0200
Subject: [PATCH] backends/drm: consider escaped separators KWIN_DRM_DEVICES

':' conflicts with the file names in /dev/dri/by-path, so allow it to be
escaped with '\'

CCBUG: 453386


(cherry picked from commit a110aabbccf56019bdc324b3c751112f35ec3f6c)
---
 src/backends/drm/drm_backend.cpp | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/backends/drm/drm_backend.cpp b/src/backends/drm/drm_backend.cpp
index 272dba702c..567ea3f696 100644
--- a/src/backends/drm/drm_backend.cpp
+++ b/src/backends/drm/drm_backend.cpp
@@ -57,12 +57,34 @@
 namespace KWin
 {
 
+static QStringList splitPathList(const QString &input, const QChar delimiter)
+{
+    QStringList ret;
+    QString tmp;
+    for (int i = 0; i < input.size(); i++) {
+        if (input[i] == delimiter) {
+            if (i > 0 && input[i - 1] == '\\') {
+                tmp[tmp.size() - 1] = delimiter;
+            } else if (!tmp.isEmpty()) {
+                ret.append(tmp);
+                tmp = QString();
+            }
+        } else {
+            tmp.append(input[i]);
+        }
+    }
+    if (!tmp.isEmpty()) {
+        ret.append(tmp);
+    }
+    return ret;
+}
+
 DrmBackend::DrmBackend(QObject *parent)
     : Platform(parent)
     , m_udev(new Udev)
     , m_udevMonitor(m_udev->monitor())
     , m_session(Session::create(this))
-    , m_explicitGpus(qEnvironmentVariable("KWIN_DRM_DEVICES").split(':', Qt::SkipEmptyParts))
+    , m_explicitGpus(splitPathList(qEnvironmentVariable("KWIN_DRM_DEVICES"), ':'))
     , m_dpmsFilter()
 {
     setSupportsPointerWarping(true);
-- 
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