From: Nick Rosbrook <[email protected]> Define Defbool as struct analagous to the C type, and define the type 'defboolVal' that represent true, false, and default defbool values.
Implement Set, Unset, SetIfDefault, IsDefault, Val, and String functions on Defbool so that the type can be used in Go analagously to how its used in C. Finally, implement fromC and toC functions. Signed-off-by: Nick Rosbrook <[email protected]> --- Cc: George Dunlap <[email protected]> Cc: Ian Jackson <[email protected]> Cc: Wei Liu <[email protected]> tools/golang/xenlight/xenlight.go | 93 +++++++++++++++++++++++++++++++ 1 file changed, 93 insertions(+) diff --git a/tools/golang/xenlight/xenlight.go b/tools/golang/xenlight/xenlight.go index e617f22fcf..7bf16dc03b 100644 --- a/tools/golang/xenlight/xenlight.go +++ b/tools/golang/xenlight/xenlight.go @@ -85,6 +85,99 @@ type MemKB uint64 type Uuid C.libxl_uuid +// defboolVal represents a defbool value. +type defboolVal int + +const ( + defboolDefault defboolVal = 0 + defboolFalse defboolVal = -1 + defboolTrue defboolVal = 1 +) + +// Defbool represents a libxl_defbool. +type Defbool struct { + val defboolVal +} + +func (d Defbool) String() string { + switch d.val { + case defboolDefault: + return "<default>" + case defboolFalse: + return "False" + case defboolTrue: + return "True" + } + + return "" +} + +// Set sets the value of the Defbool. +func (d *Defbool) Set(b bool) { + if b { + d.val = defboolTrue + return + } + d.val = defboolFalse +} + +// Unset resets the Defbool to default value. +func (d *Defbool) Unset() { + d.val = defboolDefault +} + +// SetIfDefault sets the value of Defbool only if +// its current value is default. +func (d *Defbool) SetIfDefault(b bool) { + if d.IsDefault() { + d.Set(b) + } +} + +// IsDefault returns true if the value of Defbool +// is default, returns false otherwise. +func (d *Defbool) IsDefault() bool { + return d.val == defboolDefault +} + +// Val returns the boolean value associated with the +// Defbool value. An error is returned if the value +// is default. +func (d *Defbool) Val() (bool, error) { + if d.IsDefault() { + return false, fmt.Errorf("%v: cannot take value of default defbool", ErrorInval) + } + + return (d.val > 0), nil +} + +func (d *Defbool) fromC(c *C.libxl_defbool) error { + if C.libxl_defbool_is_default(*c) { + d.val = defboolDefault + return nil + } + + if C.libxl_defbool_val(*c) { + d.val = defboolTrue + return nil + } + + d.val = defboolFalse + + return nil +} + +func (d *Defbool) toC() (C.libxl_defbool, error) { + var c C.libxl_defbool + + if !d.IsDefault() { + val, _ := d.Val() + C.libxl_defbool_set(&c, C.bool(val)) + } + + return c, nil +} + type Context struct { ctx *C.libxl_ctx logger *C.xentoollog_logger_stdiostream -- 2.19.1 _______________________________________________ Xen-devel mailing list [email protected] https://lists.xenproject.org/mailman/listinfo/xen-devel
