Definition of 2D array inside struct in RPC Specification not working

Question

I am trying to implements an NFS using RPC. Now my specification file looks something like this: (This is very a basic version of it :) )

struct input
{
    char command[20]; 
    char arg[10][10];   
    int numargs;
};

struct lsresult
{
    char arr[50][256];
};

program NFSPROG
{
    version NFSVERSION
    {
        lsresult ls(input) = 1;
        int cd(input) = 2;
        int mkdir(input) = 3;
        int mkfile(input) = 4;
    } = 1;
} = 0x21111111;

When I am trying to compile this Spec.x using rpcgen, I am getting an error like this:

 char arg[10][10];
^^^^^^^^^^^^^^
Spec.x, line 4: expected ';'

What may be the reason for this? Can't I declare a 2D array inside a struct in RPC Specification? (Same error appeared when I tried to declare variables in this way: int a,b,c in the struct!)

Answer 1

In termini of rpcgen, you need an array of strings, not a 2d array of chars. First, you have to typedef an argument type

typedef string arg<10>;

and then make an array of those arguments:

struct input
{
    string command<20>;
    arg args[10];
    int numargs;
};

similar for lsresult:

typedef string filename<50>;

struct lsresult
{
    filename arr[256];
};

That should work