init

src/device.h

@@ -0,0 +1,57 @@
+#pragma once
+// lets assume we have some app with 4 states, 3 differnet input that change the state
+// states : [locked, unlocked, off, debug] 
+// change actions : lock, str_input, power button
+//
+//      pwr     ┌──────────┐    pwr    
+// ┌─────┴┬────►│off state │◄────┴┐    
+// │      │     └────┬─────┘      │    
+// │      │          │            │    
+// │      │    ┌─────┘            │    
+// │      │    ├ pwr              │    
+// │      │    ▼                  │    
+// │   ┌──┴─────┐  str=pwd   ┌────┴───┐
+// │   │lock    ├─────┴─────►│unlock  │
+// │   │state   │            │state   │
+// │   └──────┬─┘◄───┬───────┴──┬─────┘
+// │     ^    │     lck         │      
+// │ lck ┤    ├ str=dbg         ├ str=dbg      
+// │     │    │                 │      
+// │     │    │                 │      
+// │     │    ▼                 │      
+// │   ┌─┴──────┐               │      
+// └───┤debug   │◄──────────────┘      
+//     │        │                      
+//     └────────┘                      
+
+typedef struct Device_s Device_t;
+
+
+typedef struct DeviceInterface_s{
+    // all the actions that change the state
+    // normally there wouldnt be any args
+    // but as we dont have a protected keyword
+    // we have to pass in the device to change 
+    // the state
+    void (*pressPwr)(Device_t*);
+    void (*pressStrInput)(Device_t*);
+    void (*pressLock)(Device_t*);
+}DeviceInterface_t;
+
+typedef struct DeviceState_s{
+    const char* state_name;
+    Device_t* device;
+    DeviceInterface_t methods;
+}DeviceState_t;
+
+struct Device_s{
+    // in theroy this is also the flyweight pattern
+    DeviceState_t state;
+    char* entered_string;
+    int entered_string_len;
+
+    DeviceInterface_t methods;
+};
+
+
+void initDevice(Device_t* device);