mirror of
https://github.com/RGBCube/uutils-coreutils
synced 2025-07-28 03:27:44 +00:00
Implement echo
This commit is contained in:
Derek Chiang
parent
3dfafbcc00
commit
6c46f775f7
2 changed files with 230 additions and 1 deletions
2
Makefile
2
Makefile
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@ -7,7 +7,7 @@ RUSTCFLAGS := --opt-level=3
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RMFLAGS :=
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# Output names
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EXES := false printenv true yes cat whoami env wc
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EXES := false printenv true yes cat whoami env wc echo
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TESTS := cat
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# Utils stuff
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229
echo/echo.rs
Normal file
229
echo/echo.rs
Normal file
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@ -0,0 +1,229 @@
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#[link(name="echo", vers="1.0.0", author="Derek Chiang")];
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/*
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* This file is part of the uutils coreutils package.
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*
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* (c) Derek Chiang <derekchiang93@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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extern mod extra;
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use std::os;
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use std::io::stderr;
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use std::uint;
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use extra::getopts::groups;
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static VERSION: &'static str = "1.0.0";
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fn print_char(c: char) {
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print!("{}", c);
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}
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fn to_char(bytes: &[u8], base: uint) -> char {
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uint::parse_bytes(bytes, base).unwrap() as u8 as char
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}
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fn isxdigit(c: u8) -> bool {
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match c as char {
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'0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' |
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'8' | '9' | 'A' | 'B' | 'C' | 'D' | 'E' | 'F' => true,
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_ => false
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}
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}
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fn isodigit(c: u8) -> bool {
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match c as char {
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'0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' => true,
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_ => false
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}
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}
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fn main() {
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let args = os::args();
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let program = args[0].clone();
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let opts = ~[
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groups::optflag("n", "", "do not output the trailing newline"),
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groups::optflag("e", "", "enable interpretation of backslash escapes"),
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groups::optflag("E", "", "disable interpretation of backslash escapes (default)"),
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groups::optflag("h", "help", "display this help and exit"),
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groups::optflag("V", "version", "output version information and exit"),
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];
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let matches = match groups::getopts(args.tail(), opts) {
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Ok(m) => m,
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Err(f) => {
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writeln!(&mut stderr() as &mut Writer,
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"Invalid options\n{}", f.to_err_msg());
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os::set_exit_status(1);
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return
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}
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};
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if matches.opt_present("help") {
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println("echo " + VERSION + " - display a line of text");
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println("");
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println("Usage:");
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println!(" {0:s} [SHORT-OPTION]... [STRING]...", program);
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println!(" {0:s} LONG-OPTION", program);
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println("");
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print(groups::usage("Echo the STRING(s) to standard output.", opts));
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print("\nIf -e is in effect, the following sequences are recognized:\n\
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\n\
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\\\\ backslash\n\
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\\a alert (BEL)\n\
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\\b backspace\n\
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\\c produce no further output\n\
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\\e escape\n\
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\\f form feed\n\
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\\n new line\n\
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\\r carriage return\n\
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\\t horizontal tab\n\
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\\v vertical tab\n\
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\\0NNN byte with octal value NNN (1 to 3 digits)\n\
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\\xHH byte with hexadecimal value HH (1 to 2 digits)\n\
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");
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return;
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}
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if matches.opt_present("version") {
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return println("echo version: " + VERSION);
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}
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if matches.free.is_empty() {
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print("");
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} else {
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let string = matches.free.connect(" ");
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if matches.opt_present("e") {
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let mut prev_was_slash = false;
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let mut iter = string.chars().enumerate();
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loop {
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match iter.next() {
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Some((index, c)) => {
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if !prev_was_slash {
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if c != '\\' {
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print_char(c);
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} else {
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prev_was_slash = true;
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}
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} else {
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prev_was_slash = false;
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match c {
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'\\' => print_char('\\'),
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'a' => print_char('\x07'),
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'b' => print_char('\x08'),
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'c' => break,
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'e' => print_char('\x1B'),
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'f' => print_char('\x0C'),
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'n' => print_char('\n'),
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'r' => print_char('\r'),
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't' => print_char('\t'),
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'v' => print_char('\x0B'),
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'x' => {
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if index == string.len() - 1 {
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print_char('\\');
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print_char('x');
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} else if index == string.len() - 2 {
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let next_char = string[index + 1];
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if isxdigit(next_char) {
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print_char(to_char([next_char as u8], 16u));
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iter.next();
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} else {
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print_char('\\');
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print_char('x');
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}
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} else {
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let next_char = string[index + 1];
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let next_next_char = string[index + 2];
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match (isxdigit(next_char), isxdigit(next_next_char)) {
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(true, true) => {
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print_char(to_char([next_char as u8, next_next_char as u8], 16u));
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iter.next(); iter.next();
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}
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(true, false) => {
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print_char(to_char([next_char as u8], 16u));
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iter.next();
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}
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_ => {
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print_char('\\');
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print_char('x');
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}
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};
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}
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},
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'0' => {
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if index == string.len() - 1 {
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print_char('\\');
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print_char('0');
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} else if index == string.len() - 2 {
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let next_char = string[index + 1];
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if isodigit(next_char) {
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print_char(to_char([next_char as u8], 8u));
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iter.next();
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} else {
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print_char('\\');
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print_char('0');
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}
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} else if index == string.len() - 3 {
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let next_char = string[index + 1];
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let next_next_char = string[index + 2];
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match (isodigit(next_char), isodigit(next_next_char)) {
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(true, true) => {
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print_char(to_char([next_char as u8, next_next_char as u8], 8u));
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iter.next(); iter.next();
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}
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(true, false) => {
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print_char(to_char([next_char as u8], 8u));
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iter.next();
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}
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_ => {
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print_char('\\');
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print_char('x');
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}
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};
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} else {
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let next_char = string[index + 1];
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let next_next_char = string[index + 2];
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let next_next_next_char = string[index + 3];
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match (isodigit(next_char), isodigit(next_next_char),
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isodigit(next_next_next_char)) {
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(true, true, true) => {
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print_char(to_char([next_char as u8, next_next_char as u8, next_next_next_char as u8], 8u));
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iter.next(); iter.next(); iter.next();
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}
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(true, true, false) => {
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print_char(to_char([next_char as u8, next_next_char as u8], 8u));
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iter.next(); iter.next();
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}
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(true, false, false) => {
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print_char(to_char([next_char as u8], 8u));
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iter.next();
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}
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_ => {
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print_char('\\');
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print_char('x');
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}
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};
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}
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}
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_ => {
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print_char('\\');
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print_char(c);
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}
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}
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}
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}
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None => break
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}
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}
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} else {
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print(string);
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}
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}
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if !matches.opt_present("n") {
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println("")
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}
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}
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