Macro devela::os_println

macro_rules! os_println {
    () => { ... };
    ($str:literal) => { ... };
    ($($str:literal),+ $(,)?) => { ... };
    ($buf:ident = $len:literal) => { ... };
    ($buf:ident, $($args:tt)*) => { ... };
    ($buf:ident = $len:literal, $($args:tt)*) => { ... };
    ($expr:expr) => { ... };
    ($($expr:expr),+ $(,)?) => { ... };
}

Available on (crate features std or linux_unsafe) and crate feature depend and crate feature text only.

Prints to the standard output, with a newline.

Leverages linux_println , format_buf and str_concat.

Usage is similar but not equal to std::println!.

Examples

use devela::os::{ansi, os_println};

os_println!(); // prints a newline (1st arm)
os_println!("hello world! 2nd arm"); // one literal
os_println!("hello", " world! ", 3_i32, 'r', "d arm"); // many literals

os_println!(buf_a=30); // create a buffer of some byte lenght (4th arm)
os_println!(buf_a, "hello world! {}th arm", 5); // formatted print using the buffer
os_println!(buf_b=20, "hello world! {}th arm", 6);// create a buffer and print

os_println!(&format!["{} {}! {}th arm", "hello", "world", 7]); // one &str expresion
os_println!(ansi![red], "hello", &format!["{}! {}th arm", "world", 8]); // many &str expressions

Output:

hello world! 2nd arm
hello world! 3rd arm
hello world! 5th arm
hello world! 6th arm
hello world! 7th arm
hello world! 8th arm

Error Handling

If the write fails, it prints an error message and exits with status code 10.