[PATCH] xfree86: add xf86OptionListDuplicate()

[Peter Hutterer]

Does what it says on the box.

Some drivers need to duplicate option lists from the original device to
ensure that devices created by the driver (driver-internal hotplugging) have
the same list of options as the original device.

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 hw/xfree86/common/xf86Opt.h    |    1 +
 hw/xfree86/common/xf86Option.c |   19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/hw/xfree86/common/xf86Opt.h b/hw/xfree86/common/xf86Opt.h
index d75d3bf..9453f2a 100644
--- a/hw/xfree86/common/xf86Opt.h
+++ b/hw/xfree86/common/xf86Opt.h
@@ -84,6 +84,7 @@ extern _X_EXPORT pointer xf86NewOption(char *name, char *value );
 extern _X_EXPORT pointer xf86NextOption(pointer list );
 extern _X_EXPORT pointer xf86OptionListCreate(const char **options, int count, int used);
 extern _X_EXPORT pointer xf86OptionListMerge(pointer head, pointer tail);
+extern _X_EXPORT pointer xf86OptionListDuplicate(pointer list);
 extern _X_EXPORT void xf86OptionListFree(pointer opt);
 extern _X_EXPORT char *xf86OptionName(pointer opt);
 extern _X_EXPORT char *xf86OptionValue(pointer opt);
diff --git a/hw/xfree86/common/xf86Option.c b/hw/xfree86/common/xf86Option.c
index 7ca2fdd..2ed6d6f 100644
--- a/hw/xfree86/common/xf86Option.c
+++ b/hw/xfree86/common/xf86Option.c
@@ -136,6 +136,25 @@ xf86CollectInputOptions(InputInfoPtr pInfo, const char **defaultOpts)
     }
 }
 
+/**
+ * Duplicate the option list passed in. The returned pointer will be a newly
+ * allocated option list and must be freed by the caller.
+ */
+pointer
+xf86OptionListDuplicate(pointer options)
+{
+    pointer o = NULL;
+
+    while (options)
+    {
+        o = xf86AddNewOption(o, xf86OptionName(options), xf86OptionValue(options));
+        options = xf86NextOption(options);
+    }
+
+    return o;
+}
+
+
 /* Created for new XInput stuff -- essentially extensions to the parser	*/
 
 static int
-- 
1.7.2.3