[avr-gcc-list] Strings and structures in program memory

[Trampas]

I am trying to create a simple command processor and was trying to figure out how to get strings and even the commands structure to live and operate from program memory. Can anyone show me how to do this?

 

#define COMMAND(NAME, help)  { PSTR( #NAME ), NAME ## _cmd, PSTR( help ) }

 

//Command structure

struct Command

{

            PSTR name;

            int (*function) (int, char **);

            PSTR help;

};

 

//Prototypes

int help_cmd(int, char **);

int exit_cmd(int, char **);

 

//List of supported commands

struct Command commands[] =

{

            {PSTR("help"), help_cmd, PSTR("help")}, //COMMAND (help, "Prints this message"),

            {PSTR("exit"), exit_cmd, PSTR("exit")},//COMMAND (exit, "Exits command mode"),          

            {PSTR(""),0,PSTR("")}, //End of list signal

};

 

Then to parse commands I was trying:

 

            //now let's parse the command

            i=0;

            while(strlen_P(commands[i].name)!=0)

            {

                        if (strcmp_P(buff,commands[i].name)==0)

                                    return (*commands[i].function)(numArgs,ptrArgv);

                        i=i+1;

            }

 

However this does not seem to work…

 

Thanks

Trampas