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|
use libc;
use std;
enum ScreenImpl {}
#[repr(C)]
struct Loc {
pub row: libc::c_int,
pub col: libc::c_int,
}
pub struct Screen {
pub rows: i32,
pub cols: i32,
screen_impl: *mut ScreenImpl,
}
impl Screen {
pub fn new(rows: i32, cols: i32) -> Screen {
let screen_impl = unsafe {
vt100_screen_new(rows as libc::c_int, cols as libc::c_int)
};
Screen {
rows: rows,
cols: cols,
screen_impl: screen_impl,
}
}
pub fn process(&mut self, s: &str) -> u64 {
unsafe {
vt100_screen_process_string(
self.screen_impl,
s.as_ptr() as *const libc::c_char,
s.len()
) as u64
}
}
pub fn window_contents(&self,
row_start: i32,
col_start: i32,
row_end: i32,
col_end: i32
) -> String {
let row_start = std::cmp::min(std::cmp::max(row_start, 0), self.rows - 1);
let col_start = std::cmp::min(std::cmp::max(col_start, 0), self.cols - 1);
let row_end = std::cmp::min(std::cmp::max(row_end, 0), self.rows - 1);
let col_end = std::cmp::min(std::cmp::max(col_end, 0), self.cols - 1);
let start_loc = Loc { row: row_start, col: col_start };
let end_loc = Loc { row: row_end, col: col_end };
let mut plaintext: *mut libc::c_char = unsafe { std::mem::uninitialized() };
let mut len: libc::size_t = unsafe { std::mem::uninitialized() };
unsafe {
vt100_screen_get_string_plaintext(
self.screen_impl,
&start_loc as *const Loc,
&end_loc as *const Loc,
&mut plaintext as *mut *mut libc::c_char,
&mut len as *mut libc::size_t,
)
};
let rust_plaintext = unsafe {
std::slice::from_raw_parts(
plaintext as *mut libc::c_uchar,
len
)
}.to_vec();
std::string::String::from_utf8(rust_plaintext).unwrap()
}
}
impl Drop for Screen {
fn drop(&mut self) {
unsafe { vt100_screen_delete(self.screen_impl) };
}
}
extern "C" {
fn vt100_screen_new(
rows: libc::c_int,
cols: libc::c_int
) -> *mut ScreenImpl;
fn vt100_screen_delete(screen: *mut ScreenImpl);
fn vt100_screen_process_string(
screen: *mut ScreenImpl,
buf: *const libc::c_char,
len: libc::size_t,
) -> libc::c_int;
fn vt100_screen_get_string_plaintext(
screen: *mut ScreenImpl,
start: *const Loc,
end: *const Loc,
outp: *mut *mut libc::c_char,
outlen: *mut libc::size_t,
);
}
#[cfg(test)]
mod tests {
#[test]
fn ffi() {
let ptr = unsafe { super::vt100_screen_new(24, 80) };
assert!(!ptr.is_null());
unsafe { super::vt100_screen_delete(ptr) };
}
}
|
