How to convert macro argument value to string using xmacros instead of converting the passed argument itself

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I am posting this question here after I have done enough research within our community. However, I couldn't find a proper solution for my problem yet. So, I am posting my question here.

#define Get_EventID_FROM_CODE(code)         ?????   // ex: when code= 0x00ED3581, then it should return SWC_FAULT_CODE_0x00ED3581_EVENT macro or it's value 213
#define Get_EventID_FROM_ENUM(code_enum)    ?????   // ex: when code_enum= CODE_0x00ED3581, then it should return SWC_FAULT_CODE_0x00ED3581_EVENT macro or it's value 213
#define Get_CodeEnumName(code)              ?????   // ex: when code = 0x00ED3581, then it should return DTC_0x00ED3581 which is enum element

typedef enum
{
    CODE_TABLE(EXPAND_AS_ENUMERATION)
    CODE_COUNT
}codeList_t ;


void Cycle_1ms(const uint32 code)
{
    
    // Based on code value, I want to get the macro value of SWC_FAULT_CODE_0xZZZZZZZZ_EVENT. 
    // ex: when code = 0x00ED3581, then eventID = SWC_FAULT_CODE_0x00ED3581_EVENT = 213
    
    uint16 eventID_FromCode = Get_EventID(code);
    
}

void Cycle_1ms_anotherFunc(codeList_t  code_enum)
{
// Based on code value, I want to get the macro value of SWC_FAULT_CODE_0xZZZZZZZZ_EVENT. 
    // ex: when code = 0x00ED3581, then eventID = SWC_FAULT_CODE_0x00ED3581_EVENT = 213
    uint16 eventID_FromCodeEnum = Get_EventID_FROM_ENUM(code_enum);
}

void callback_func(uint32 code, uint8* buf)
{
    
    // here, based on code value Get_CodeEnumName() should provide the enum element for that code. ex: when code= 0x00ED3581, enum_var = DTC_0x00ED3581
    codeList_t enum_var = Get_CodeEnumName(code);
}

Here, CODE_TABLE will be changed from project to project and number of elements with in this table. After reading several articles and topics on Xmacros, I though of using Xmacros concept here to avoid looping and heavy use of RAM memory .

What I have tried:

I have tried below snippets of code.

#define Get_RealEventID_From_CodeEnum(code) SWC_FAULT_CODE_##code##_EVENT
#define Get_EventID_FROM_CODE(code) Get_RealEventID_From_CodeEnum(code)

#define Get_RealCodeName(code) CODE_#code
#define Get_CodeEnumName(code) Get_RealCodeName(code)

Posted 1-Jun-21 21:17pm

ccodeworld.blogspot.com

Updated 1-Jun-21 21:54pm

v2

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Richard MacCutchan · Answer 1 · 2021-06-01T21:54:00

I have a similar issue which I solved with two stage macros. I am not sure that the following actually gives the result you are looking for, but it generates the correct string as far as I can see. Maybe it is something you can build on.

C++

#define Event1 0x00ED3581

#define	STR(x)				#x
// sets the full version string to the form SWC_FAULT_CODE_0x00ED3581_EVENT etc.
#define	Get_EventID(code)	STR(SWC_FAULT_CODE_)##STR(code)##STR(_EVENT)
cout << Get_EventID(Event1) << endl;