BACKENDS: Add OSystem::getDefaultConfigFileName

This is used to provide default implementations for createConfigWriteStream
and createConfigReadStream, which can be used by most backends.

Note that backends can still override createConfigRead/WriteStream;
this could be useful if settings on some port are not stored in a
regular file (think 'Windows registry', for a hypothetical example).

2 files changed, 28 insertions, 2 deletions

diff --git a/common/system.cpp b/common/system.cpp
index dcdc38c0db..307079d112 100644
--- a/common/system.cpp
+++ b/common/system.cpp
@@ -26,6 +26,7 @@
 
 #include "common/system.h"
 #include "common/str.h"
+#include "common/fs.h"
 #include "common/textconsole.h"
 
 #include "backends/audiocd/default/default-audiocd.h"
@@ -90,6 +91,24 @@ void OSystem::fatalError() {
 	exit(1);
 }
 
+Common::SeekableReadStream *OSystem::createConfigReadStream() {
+	Common::FSNode file(getDefaultConfigFileName());
+	return file.createReadStream();
+}
+
+Common::WriteStream *OSystem::createConfigWriteStream() {
+#ifdef __DC__
+	return 0;
+#else
+	Common::FSNode file(getDefaultConfigFileName());
+	return file.createWriteStream();
+#endif
+}
+
+Common::String OSystem::getDefaultConfigFileName() {
+	return "scummvm.ini";
+}
+
 void OSystem::logMessage(LogMessageType::Type type, const char *message) {
 	FILE *output = 0;
 
diff --git a/common/system.h b/common/system.h
index 4b85f143b7..85771cf982 100644
--- a/common/system.h
+++ b/common/system.h
@@ -1015,7 +1015,7 @@ public:
 	 * ReadStream instance. It is the callers responsiblity to delete
 	 * the stream after use.
 	 */
-	virtual Common::SeekableReadStream *createConfigReadStream() = 0;
+	virtual Common::SeekableReadStream *createConfigReadStream();
 
 	/**
 	 * Open the default config file for writing, by returning a suitable
@@ -1024,7 +1024,14 @@ public:
 	 *
 	 * May return 0 to indicate that writing to config file is not possible.
 	 */
-	virtual Common::WriteStream *createConfigWriteStream() = 0;
+	virtual Common::WriteStream *createConfigWriteStream();
+
+	/**
+	 * Get the default file name (or even path) where the user configuration
+	 * of ScummVM will be saved.
+	 * Note that not all ports may use this.
+	 */
+	virtual Common::String getDefaultConfigFileName();
 
 	/**
 	 * Logs a given message.