Initial commit

.gitignore

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+/target
+Cargo.lock
+/.idea

Cargo.toml

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+[package]
+name = "filmscript"
+version = "0.1.0"
+authors = ["NGnius (Graham) <ngniusness@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+libc = "0.2"
+clap = "2"
+
+[lib]
+name = "filmscript"
+crate-type = ["rlib", "cdylib"]

LICENSE

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+MIT License
+
+Copyright (c) 2021 NGnius
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# FilmScript
+
+The best Canadian camera technology since IMAX.

src/lib.rs

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+use std::ffi::CString;
+use std::os::raw::c_char;
+
+mod version;
+
+pub unsafe fn allocate_cstring(input: &str) -> *mut c_char {
+    let input_c = CString::new(input).expect("Rust &str -> CString conversion failed");
+    let space = libc::malloc(libc::strlen(input_c.as_ptr()) + 1) as *mut c_char;
+    libc::strcpy(space, input_c.as_ptr());
+    return space;
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}

src/version.rs

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+//use libc;
+use std::os::raw::c_char;
+use crate::allocate_cstring;
+
+#[no_mangle]
+pub unsafe extern "C" fn filmscript_version() -> *const c_char {
+    let crate_v = clap::crate_version!();
+    allocate_cstring(crate_v)
+}