1 files changed, 55 insertions, 0 deletions
diff --git a/src/tools/shared/depfile_shared.h b/src/tools/shared/depfile_shared.h
new file mode 100644
index 0000000000..411a7a1110
--- /dev/null
+++ b/src/tools/shared/depfile_shared.h
@@ -0,0 +1,55 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#ifndef QTBASE_DEPFILE_SHARED_H
+#define QTBASE_DEPFILE_SHARED_H
+
+#include <QByteArray>
+#include <QString>
+#include <QFile>
+
+// Escape characters in given path. Dependency paths are Make-style, not NMake/Jom style.
+// The paths can also be consumed by Ninja.
+// "$" replaced by "$$"
+// "#" replaced by "\#"
+// " " replaced by "\ "
+// "\#" replaced by "\\#"
+// "\ " replaced by "\\\ "
+//
+// The escape rules are according to what clang / llvm escapes when generating a Make-style
+// dependency file.
+// Is a template function, because input param can be either a QString or a QByteArray.
+template <typename T> struct CharType;
+template <> struct CharType<QString> { using type = QLatin1Char; };
+template <> struct CharType<QByteArray> { using type = char; };
+template <typename StringType>
+StringType escapeDependencyPath(const StringType &path)
+{
+    using CT = typename CharType<StringType>::type;
+    StringType escapedPath;
+    int size = path.size();
+    escapedPath.reserve(size);
+    for (int i = 0; i < size; ++i) {
+        if (path[i] == CT('$')) {
+            escapedPath.append(CT('$'));
+        } else if (path[i] == CT('#')) {
+            escapedPath.append(CT('\\'));
+        } else if (path[i] == CT(' ')) {
+            escapedPath.append(CT('\\'));
+            int backwards_it = i - 1;
+            while (backwards_it > 0 && path[backwards_it] == CT('\\')) {
+                escapedPath.append(CT('\\'));
+                --backwards_it;
+            }
+        }
+        escapedPath.append(path[i]);
+    }
+    return escapedPath;
+}
+
+static inline QByteArray escapeAndEncodeDependencyPath(const QString &path)
+{
+    return QFile::encodeName(escapeDependencyPath(path));
+}
+
+#endif // QTBASE_DEPFILE_SHARED_H