Adding the basic c_types as their own file section.

Also, added the to_c_string and from_c_string functions. Their
location needs to be determined.

Cargo.toml

@@ -9,5 +9,10 @@ documentation = ""
 keywords = ["binding", "c types", "c enums", "c flags", "c strings"]
 
 
+[features]
+default = []
+use_std = []
+
+
 [dependencies.scribe]
 git = "https://gitlab.com/CyberMages/scribe.git"

src/c_string.rs

@@ -1,5 +1,5 @@
-use std::ffi::{CStr, CString};
-use std::os::raw::c_char;
+//use std::ffi::{CStr, CString};
+//use super::c_types::CChar;
 
 
 
@@ -8,12 +8,16 @@ pub const EMPTY_STRING: &'static str = "";
 
 
 
+/*
+   TODO: from_c_string should be moved to wherever our String class will
+         reside.
+
 /// Creates a new String from the data in the pointer.
 ///
 /// Any conversion errors will result in an Empty
 /// String being returned. Option is not used here for
 /// simplicities sake.
-pub fn from_c_string(c_string: *const c_char) -> String
+pub fn from_c_string(c_string: *const CChar) -> String
 {
    unsafe
    {
@@ -21,6 +25,12 @@ pub fn from_c_string(c_string: *const c_char) -> String
    }
 }
 
+*/
+/*
+   TODO: Determine if a CString class can be created at this level if
+         there is no allocation available. The answer is probably not,
+         but it needs to be investigated.
+
 /// Creates a CString from a given str.
 ///
 /// This may be "" if there is an UTF8 conversion error.
@@ -59,3 +69,5 @@ pub fn to_c_string<P>(string: P) -> CString
       }
    }
 }
+
+*/

src/c_types.rs

@@ -0,0 +1,70 @@
+//! This defines the primitive types that may be seen
+//! when creating 'C' bindings.
+//!
+//! There are several places where the target architecture and the OS
+//! require special consideration. These are handled
+//! with configuration statements.
+
+// Character types.
+#[cfg(any(target_os="android", target_os="emscripten",
+          all(target_os="linux",
+              any(target_arch="aarch64", target_arch="arm",
+                  target_arch="powerpc", target_arch="powerpc64"))))]
+pub type CChar = u8;
+
+#[cfg(not(any(target_os="android", target_os="emscripten",
+              all(target_os="linux",
+                  any(target_arch="aarch64", target_arch="arm",
+                      target_arch="powerpc", target_arch="powerpc64")))))]
+pub type CChar = i8;
+
+
+pub type CIChar = i8;
+pub type CUChar = u8;
+
+
+
+// Integer types.
+#[cfg(any(target_pointer_width="32", target_os="windows"))]
+pub type CLong = i32;
+
+#[cfg(any(target_pointer_width="32", target_os="windows"))]
+pub type CULong = u32;
+
+
+#[cfg(all(target_pointer_width="64", not(target_os="windows")))]
+pub type CLong = i32;
+
+#[cfg(all(target_pointer_width="64", not(target_os="windows")))]
+pub type CULong = u32;
+
+
+pub type CShort = i16;
+pub type CUShort = u16;
+pub type CInt = i32;
+pub type CUInt = u32;
+pub type CLongLong = u64;
+pub type CULongLong = u64;
+pub type CFloat = f32;
+pub type CDouble = f64;
+
+
+
+// Void types.
+/// To return void from a 'C' function it should return an empty tuple ().
+/// This type is just a descriptive version of that. **DO NOT** use this
+/// as an argument to a function. Use the c_void type for that.
+pub type CReturnVoid = ();
+
+/// This acts as a 'C' void pointer to pass to functions. **DO NOT**
+/// use this as a return type from a 'C' function. If a 'C' function
+/// returns void, then use the c_return_void type for that.
+#[repr(u8)]
+pub enum CVoid
+{
+   #[doc(hidden)]
+   _Variant,
+
+   #[doc(hidden)]
+   _Variant2
+}

src/lib.rs

@@ -1,6 +1,19 @@
 //! The Binding library is a place where common macros and functions
 //! that are used when interfacing with C libraries can be stored
 //! for use amoungst all of CyberMages LLC's projects.
+
+// Handle using the core or the std of Rust depending on the chosen feature.
+#![cfg_attr(not(feature="use_std"), no_std)]
+
+// This crate can only use parts of Rust that are in both the core
+// and the standard library. This way the logging system will work for
+// libraries that use either.
+//
+// This is handled by coding using the std library and referencing the core
+// library as the std library if the core library is desired.
+#[cfg(not(feature="use_std"))]
+extern crate core as std;
+
 #[macro_use]
 extern crate scribe;
 
@@ -10,11 +23,17 @@ extern crate scribe;
 mod c_enum;
 mod c_flags;
 mod c_string;
+mod c_types;
 
 // Raw platform data retrieval.
 mod raw;
 
 
 
-pub use self::c_string::{EMPTY_STRING, from_c_string, to_c_string};
+pub use self::c_string::EMPTY_STRING;
+//pub use self::c_string::{from_c_string, to_c_string};
+pub use self::c_types::{CChar, CIChar, CUChar};
+pub use self::c_types::{CShort, CUShort, CInt, CUInt, CLong, CULong};
+pub use self::c_types::{CLongLong, CULongLong, CFloat, CDouble};
+pub use self::c_types::{CVoid, CReturnVoid};
 pub use self::raw::{AsRaw, AsRawMut, AsRawPtr, AsRawMutPtr, FromRaw, IntoRaw};