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b9eb364823
src/term.rs:37:39: 37:49 error: unresolved name `TIOCGWINSZ` [E0425] src/term.rs:37 let result = ioctl(STDOUT_FILENO, TIOCGWINSZ, &mut window); ^~~~~~~~~~
65 lines
1.8 KiB
Rust
65 lines
1.8 KiB
Rust
//! System calls for getting the terminal size.
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//!
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//! Getting the terminal size is performed using an ioctl command that takes
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//! the file handle to the terminal -- which in this case, is stdout -- and
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//! populates a structure containing the values.
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//!
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//! The size is needed when the user wants the output formatted into columns:
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//! the default grid view, or the hybrid grid-details view.
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use std::mem::zeroed;
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use libc::{c_int, c_ushort, c_ulong, STDOUT_FILENO};
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/// The number of rows and columns of a terminal.
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struct Winsize {
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ws_row: c_ushort,
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ws_col: c_ushort,
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}
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// Unfortunately the actual command is not standardised...
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#[cfg(any(target_os = "linux", target_os = "android"))]
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static TIOCGWINSZ: c_ulong = 0x5413;
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#[cfg(any(target_os = "macos",
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target_os = "ios",
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target_os = "bitrig",
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target_os = "dragonfly",
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target_os = "freebsd",
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target_os = "netbsd",
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target_os = "openbsd"))]
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static TIOCGWINSZ: c_ulong = 0x40087468;
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extern {
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pub fn ioctl(fd: c_int, request: c_ulong, ...) -> c_int;
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}
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/// Runs the ioctl command. Returns (0, 0) if output is not to a terminal, or
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/// there is an error. (0, 0) is an invalid size to have anyway, which is why
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/// it can be used as a nil value.
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unsafe fn get_dimensions() -> Winsize {
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let mut window: Winsize = zeroed();
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let result = ioctl(STDOUT_FILENO, TIOCGWINSZ, &mut window);
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if result == -1 {
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zeroed()
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}
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else {
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window
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}
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}
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/// Query the current processes's output, returning its width and height as a
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/// number of characters. Returns `None` if the output isn't to a terminal.
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pub fn dimensions() -> Option<(usize, usize)> {
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let w = unsafe { get_dimensions() };
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if w.ws_col == 0 || w.ws_row == 0 {
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None
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}
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else {
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Some((w.ws_col as usize, w.ws_row as usize))
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}
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}
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