[Xen-devel] [PATCH v3 07/22] golang/xenlight: define Mac builtin type

[Nick Rosbrook <rosbrookn@xxxxxxxxx>]

From: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>

Define Mac as [6]byte and implement fromC, toC, and String functions.

Signed-off-by: Nick Rosbrook <rosbrookn@xxxxxxxxxxxx>
Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>
---
Changes in v2:
- Fix the format string in String function to use %02x.
- Use a value reciever for the toC function.
Changes in v3:
- Iterate over the indirect of mac instead of creating
  a slice from the C type.
---
 tools/golang/xenlight/xenlight.go | 33 +++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tools/golang/xenlight/xenlight.go 
b/tools/golang/xenlight/xenlight.go
index 72afc3cf14..17d146771e 100644
--- a/tools/golang/xenlight/xenlight.go
+++ b/tools/golang/xenlight/xenlight.go
@@ -181,6 +181,39 @@ func (d *Defbool) toC() (C.libxl_defbool, error) {
        return c, nil
 }
 
+// Mac represents a libxl_mac, or simply a MAC address.
+type Mac [6]byte
+
+// String formats a Mac address to string representation.
+func (mac Mac) String() string {
+       s := "%02x:%02x:%02x:%02x:%02x:%02x"
+       opts := make([]interface{}, 6)
+
+       for i, v := range mac {
+               opts[i] = v
+       }
+
+       return fmt.Sprintf(s, opts...)
+}
+
+func (mac *Mac) fromC(cmac *C.libxl_mac) error {
+       for i := range *mac {
+               mac[i] = byte(cmac[i])
+       }
+
+       return nil
+}
+
+func (mac Mac) toC() (C.libxl_mac, error) {
+       var cmac C.libxl_mac
+
+       for i, v := range mac {
+               cmac[i] = C.uint8_t(v)
+       }
+
+       return cmac, nil
+}
+
 type Context struct {
        ctx    *C.libxl_ctx
        logger *C.xentoollog_logger_stdiostream
-- 
2.19.1


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