[PATCH v3 6/7] common: state: Add function to read state MAC

[Daniel Schultz <d.schultz@phytec.de>]

This API function allows to receive a copy of a MAC address from
variables in a state.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
---
Changes:
	v2: New patch
	v3: Changed return values
	    Switched to the new STATE_VARIABLE_TYPE_* field
	    Changed to memcpy function, instead of own loop

 common/state/state.c | 21 +++++++++++++++++++++
 include/state.h      |  2 ++
 2 files changed, 23 insertions(+)

diff --git a/common/state/state.c b/common/state/state.c
index 98a7db3..6399bd3 100644
--- a/common/state/state.c
+++ b/common/state/state.c
@@ -693,6 +693,27 @@ int state_get_name(const struct state *state, char const **name)
 	return 0;
 }
 
+int state_read_mac(struct state *state, const char *name, u8 *buf)
+{
+	struct state_variable *svar;
+	struct state_mac *mac;
+
+	if (!state || !name || !buf)
+		return -EINVAL;
+
+	svar = state_find_var(state, name);
+	if (IS_ERR(svar))
+		return PTR_ERR(svar);
+
+	if (svar->type->type != STATE_VARIABLE_TYPE_MAC)
+		return -EINVAL;
+
+	mac = to_state_mac(svar);
+	memcpy(buf, mac->value, 6);
+
+	return 0;
+}
+
 void state_info(void)
 {
 	struct state *state;
diff --git a/include/state.h b/include/state.h
index 63164f9..f1882ae 100644
--- a/include/state.h
+++ b/include/state.h
@@ -23,4 +23,6 @@ int state_load(struct state *state);
 int state_save(struct state *state);
 void state_info(void);
 
+int state_read_mac(struct state *state, const char *name, u8 *buf);
+
 #endif /* __STATE_H */
-- 
2.7.4


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