configtpl 0.1.0

A configuration library which uses Jinja + YAML to render the configuration values.
Documentation 
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use std::ffi::{c_char, CStr, CString};

use crate::shared_lib::ffi::types::std_types::ConstCharPtr;

///Converts a *char C type into Rust string.
/// ```
/// use configtpl::shared_lib::ffi::utils::strings;
/// assert_eq!(strings::cchar_to_string(c"Hello, World!".as_ptr()),
///            String::from("Hello, World!"));
/// ```
pub fn cchar_to_string(c: ConstCharPtr) -> String {
    unsafe { CStr::from_ptr(c).to_string_lossy().to_string() }
}

/// Converts String to char* C type.
/// NB: the output of this function must be deallocated later using 'cchar_const_deallocate' function
pub fn string_to_cchar<S: Into<String>>(s: S) -> ConstCharPtr {
    CString::new(s.into())
        .expect("Failed to convert String to c_char")
        .into_raw()
}

/// Deallocates memory for C string.
/// This function should be called for strings created by *_to_cchar functions above
pub fn cchar_const_deallocate(c: ConstCharPtr) {
    if c.is_null() {
        return
    }

    let _ = unsafe { CString::from_raw(c as *mut c_char) };
}