use nix::libc::user_regs_struct;

/// Struct used to manipulate registers data from https://docs.rs/libc/0.2.147/libc/struct.user_regs_struct.html
pub struct RegistersData {
    orig_rax: u64,
    rdi: u64,
    rsi: u64,
    rdx: u64,
    rax: u64,
}

impl RegistersData {
    /// Create new `RegistersData` from an `user_regs_struct`'C structure
    pub fn new(registers: user_regs_struct) -> RegistersData {
        RegistersData {
            orig_rax: registers.orig_rax,
            rdi: registers.rdi,
            rsi: registers.rsi,
            rdx: registers.rdx,
            rax: registers.rax,
        }
    }

    /// Returns a good string which shows the output for a line
    pub fn output(&self) -> String {
        format!(
            "{}({:x}, {:x}, {:x}, ...) = {:x}",
            self.orig_rax, self.rdi, self.rsi, self.rdx, self.rax
        )
    }
}