mirror of
https://github.com/uutils/coreutils
synced 2024-10-06 16:09:08 +00:00
Arcterus
commit
1240213acb
358
cat/cat.rs
358
cat/cat.rs
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@ -1,5 +1,4 @@
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#![crate_id(name="cat", vers="1.0.0", author="Seldaek")]
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#![feature(managed_boxes)]
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/*
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* This file is part of the uutils coreutils package.
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@ -16,24 +15,27 @@ extern crate getopts;
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use std::os;
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use std::io::{print, File};
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use std::io::stdio::{stdout_raw, stdin_raw};
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use std::io::{BufferedWriter};
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use std::io::stdio::{stdout_raw, stdin_raw, stderr};
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use std::io::{IoResult};
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use std::ptr::{copy_nonoverlapping_memory};
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#[allow(dead_code)]
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fn main() { uumain(os::args()); }
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pub fn uumain(args: Vec<String>) {
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let program = args.get(0).as_slice();
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let opts = ~[
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let opts = [
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getopts::optflag("A", "show-all", "equivalent to -vET"),
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getopts::optflag("b", "number-nonblank", "number nonempty output lines, overrides -n"),
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getopts::optflag("b", "number-nonblank",
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"number nonempty output lines, overrides -n"),
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getopts::optflag("e", "", "equivalent to -vE"),
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getopts::optflag("E", "show-ends", "display $ at end of each line"),
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getopts::optflag("n", "number", "number all output lines"),
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getopts::optflag("s", "squeeze-blank", "suppress repeated empty output lines"),
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getopts::optflag("t", "", "equivalent to -vT"),
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getopts::optflag("T", "show-tabs", "display TAB characters as ^I"),
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getopts::optflag("v", "show-nonprinting", "use ^ and M- notation, except for LF (\\n) and TAB (\\t)"),
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getopts::optflag("v", "show-nonprinting",
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"use ^ and M- notation, except for LF (\\n) and TAB (\\t)"),
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getopts::optflag("h", "help", "display this help and exit"),
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getopts::optflag("V", "version", "output version information and exit"),
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];
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@ -47,7 +49,8 @@ pub fn uumain(args: Vec<String>) {
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println!("Usage:");
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println!(" {0:s} [OPTION]... [FILE]...", program);
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println!("");
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print(getopts::usage("Concatenate FILE(s), or standard input, to standard output.", opts).as_slice());
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print(getopts::usage("Concatenate FILE(s), or standard input, to \
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standard output.", opts).as_slice());
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println!("");
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println!("With no FILE, or when FILE is -, read standard input.");
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return;
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@ -58,133 +61,300 @@ pub fn uumain(args: Vec<String>) {
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}
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let mut number_mode = NumberNone;
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if matches.opt_present("number") {
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if matches.opt_present("n") {
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number_mode = NumberAll;
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}
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if matches.opt_present("number-nonblank") {
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if matches.opt_present("b") {
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number_mode = NumberNonEmpty;
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}
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let show_nonprint = matches.opts_present(["show-nonprinting".to_string(), "show-all".to_string(), "t".to_string(), "e".to_string()]);
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let show_ends = matches.opts_present(["show-ends".to_string(), "show-all".to_string(), "e".to_string()]);
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let show_tabs = matches.opts_present(["show-tabs".to_string(), "show-all".to_string(), "t".to_string()]);
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let squeeze_blank = matches.opt_present("squeeze-blank");
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let show_nonprint = matches.opts_present(["A".to_string(), "e".to_string(),
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"t".to_string(), "v".to_string()]);
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let show_ends = matches.opts_present(["E".to_string(), "A".to_string(),
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"e".to_string()]);
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let show_tabs = matches.opts_present(["A".to_string(), "T".to_string(),
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"t".to_string()]);
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let squeeze_blank = matches.opt_present("s");
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let mut files = matches.free;
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if files.is_empty() {
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files = vec!("-".to_string());
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files.push("-".to_string());
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}
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exec(files, number_mode, show_nonprint, show_ends, show_tabs, squeeze_blank);
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}
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#[deriving(Eq)]
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pub enum NumberingMode {
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enum NumberingMode {
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NumberNone,
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NumberNonEmpty,
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NumberAll,
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}
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static TAB: u8 = '\t' as u8;
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#[allow(dead_code)]
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static CR: u8 = '\r' as u8;
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static LF: u8 = '\n' as u8;
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fn write_lines(files: Vec<String>, number: NumberingMode, squeeze_blank: bool,
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show_ends: bool) {
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#[cfg(windows)]
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fn is_newline_char(byte: u8) -> bool {
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byte == LF || byte == CR
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}
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let mut line_counter: uint = 1;
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#[cfg(unix)]
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fn is_newline_char(byte: u8) -> bool {
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byte == LF
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}
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for path in files.iter() {
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let (mut reader, interactive) = match open(path.as_slice()) {
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Some(f) => f,
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None => continue,
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};
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pub fn exec(files: Vec<String>, number: NumberingMode, show_nonprint: bool, show_ends: bool, show_tabs: bool, squeeze_blank: bool) {
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if NumberNone != number || show_nonprint || show_ends || show_tabs || squeeze_blank {
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let mut counter: uint = 1;
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let is_numbering = number == NumberAll || number == NumberNonEmpty;
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for path in files.iter() {
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let mut reader = match open(path.as_slice()) {
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Some(f) => f,
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None => { continue }
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let mut in_buf = [0, .. 1024 * 31];
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let mut out_buf = [0, .. 1024 * 64];
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let mut writer = UnsafeWriter::new(out_buf.as_mut_slice(), stdout_raw());
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let mut at_line_start = true;
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loop {
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let n = match reader.read(in_buf) {
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Ok(n) if n != 0 => n,
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_ => break,
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};
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let mut writer = BufferedWriter::with_capacity(1024 * 8, stdout_raw());
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let mut at_line_start = true;
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let mut buf = ~[0, .. 1024 * 4];
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let in_buf = in_buf.slice_to(n);
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let mut buf_pos = range(0, n);
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loop {
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// reading from a TTY seems to raise a condition on
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// EOF, rather than return Some(0) like a file.
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match reader.read(buf) {
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Ok(n) if n != 0 => {
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for &byte in buf.slice_to(n).iter() {
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if at_line_start && (number == NumberAll || (number == NumberNonEmpty && !is_newline_char(byte))) {
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(write!(&mut writer as &mut Writer, "{0:6u}\t", counter)).unwrap();
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counter += 1;
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at_line_start = false;
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}
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if is_numbering && byte == LF {
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at_line_start = true;
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}
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if show_tabs && byte == TAB {
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writer.write(bytes!("^I")).unwrap();
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} else if show_ends && byte == LF {
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writer.write(bytes!("$\n")).unwrap();
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} else if show_nonprint && (byte < 32 || byte >= 127) && !is_newline_char(byte) {
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let mut byte = byte;
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if byte >= 128 {
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writer.write(bytes!("M-")).unwrap();
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byte = byte - 128;
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}
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if byte < 32 {
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writer.write(['^' as u8, byte + 64]).unwrap();
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} else if byte == 127 {
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writer.write(['^' as u8, byte - 64]).unwrap();
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} else {
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writer.write_u8(byte).unwrap();
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}
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} else {
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writer.write_u8(byte).unwrap();
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}
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writer.possibly_flush();
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let pos = match buf_pos.next() {
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Some(p) => p,
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None => break,
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};
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if in_buf[pos] == '\n' as u8 {
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if !at_line_start || !squeeze_blank {
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if at_line_start && number == NumberAll {
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(write!(&mut writer, "{0:6u}\t", line_counter)).unwrap();
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line_counter += 1;
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}
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},
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_ => break
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if show_ends {
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writer.write_u8('$' as u8).unwrap();
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}
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writer.write_u8('\n' as u8).unwrap();
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if interactive {
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writer.flush().unwrap();
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}
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}
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at_line_start = true;
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continue;
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}
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if at_line_start && number != NumberNone {
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(write!(&mut writer, "{0:6u}\t", line_counter)).unwrap();
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line_counter += 1;
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}
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match in_buf.tailn(pos).iter().position(|c| *c == '\n' as u8) {
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Some(p) => {
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writer.write(in_buf.slice(pos, pos + p)).unwrap();
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if show_ends {
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writer.write_u8('$' as u8).unwrap();
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}
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writer.write_u8('\n' as u8).unwrap();
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if interactive {
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writer.flush().unwrap();
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}
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buf_pos = range(pos + p + 1, n);
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at_line_start = true;
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},
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None => {
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writer.write(in_buf.tailn(pos)).unwrap();
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at_line_start = false;
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break;
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}
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};
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}
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}
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return;
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}
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}
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fn write_bytes(files: Vec<String>, number: NumberingMode, squeeze_blank: bool,
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show_ends: bool, show_nonprint: bool, show_tabs: bool) {
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let mut line_counter: uint = 1;
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let mut writer = stdout_raw();
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let mut buf = ~[0, .. 1024 * 64];
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// passthru mode
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for path in files.iter() {
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let mut reader = match open(path.as_slice()) {
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let (mut reader, interactive) = match open(path.as_slice()) {
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Some(f) => f,
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None => { continue }
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None => continue,
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};
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// Flush all 1024 iterations.
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let mut flush_counter = range(0, 1024);
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let mut in_buf = [0, .. 1024 * 32];
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let mut out_buf = [0, .. 1024 * 64];
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let mut writer = UnsafeWriter::new(out_buf.as_mut_slice(), stdout_raw());
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let mut at_line_start = true;
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loop {
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let n = match reader.read(in_buf) {
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Ok(n) if n != 0 => n,
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_ => break,
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};
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for &byte in in_buf.slice_to(n).iter() {
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if flush_counter.next().is_none() {
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writer.possibly_flush();
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flush_counter = range(0, 1024);
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}
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if byte == '\n' as u8 {
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if !at_line_start || !squeeze_blank {
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if at_line_start && number == NumberAll {
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(write!(&mut writer, "{0:6u}\t", line_counter)).unwrap();
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line_counter += 1;
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}
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if show_ends {
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writer.write_u8('$' as u8).unwrap();
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}
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writer.write_u8('\n' as u8).unwrap();
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if interactive {
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writer.flush().unwrap();
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}
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}
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at_line_start = true;
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continue;
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}
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if at_line_start && number != NumberNone {
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(write!(&mut writer, "{0:6u}\t", line_counter)).unwrap();
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line_counter += 1;
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at_line_start = false;
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}
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// This code is slow because of the many branches. cat in glibc avoids
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// this by having the whole loop inside show_nonprint.
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if byte == '\t' as u8 {
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if show_tabs {
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writer.write_str("^I")
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} else {
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writer.write_u8(byte)
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}
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} else if show_nonprint {
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let byte = match byte {
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128 .. 255 => {
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writer.write_str("M-").unwrap();
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byte - 128
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},
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_ => byte,
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};
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match byte {
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0 .. 31 => writer.write(['^' as u8, byte + 64]),
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127 => writer.write(['^' as u8, byte - 64]),
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_ => writer.write_u8(byte),
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}
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} else {
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writer.write_u8(byte)
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}.unwrap();
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}
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}
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}
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}
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fn write_fast(files: Vec<String>) {
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let mut writer = stdout_raw();
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let mut in_buf = [0, .. 1024 * 64];
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for path in files.iter() {
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let (mut reader, _) = match open(path.as_slice()) {
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Some(x) => x,
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None => continue,
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};
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loop {
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// reading from a TTY seems to raise a condition on EOF,
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// rather than return Some(0) like a file.
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match reader.read(buf) {
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match reader.read(in_buf) {
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Ok(n) if n != 0 => {
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writer.write(buf.slice_to(n)).unwrap();
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}, _ => break
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// This interface is completely broken.
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writer.write(in_buf.slice_to(n)).unwrap();
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},
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_ => break
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}
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}
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}
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}
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fn open(path: &str) -> Option<Box<Reader>> {
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if "-" == path {
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return Some(box stdin_raw() as Box<Reader>);
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}
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fn exec(files: Vec<String>, number: NumberingMode, show_nonprint: bool,
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show_ends: bool, show_tabs: bool, squeeze_blank: bool) {
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match File::open(&std::path::Path::new(path.as_slice())) {
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Ok(fd) => return Some(box fd as Box<Reader>),
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Err(e) => fail!("cat: {0:s}: {1:s}", path, e.to_str())
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if show_nonprint || show_tabs {
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write_bytes(files, number, squeeze_blank, show_ends, show_nonprint, show_tabs);
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} else if number != NumberNone || squeeze_blank || show_ends {
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write_lines(files, number, squeeze_blank, show_ends);
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} else {
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write_fast(files);
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}
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}
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fn open(path: &str) -> Option<(Box<Reader>, bool)> {
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if path == "-" {
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let stdin = stdin_raw();
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let interactive = stdin.isatty();
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return Some((box stdin as Box<Reader>, interactive));
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}
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match File::open(&std::path::Path::new(path)) {
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Ok(f) => return Some((box f as Box<Reader>, false)),
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Err(e) => {
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(writeln!(stderr(), "cat: {0:s}: {1:s}", path, e.to_str())).unwrap();
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return None;
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},
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};
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}
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struct UnsafeWriter<'a, W> {
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inner: W,
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buf: &'a mut [u8],
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pos: uint,
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threshold: uint,
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||||
}
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impl<'a, W: Writer> UnsafeWriter<'a, W> {
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fn new(buf: &'a mut [u8], inner: W) -> UnsafeWriter<'a, W> {
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let threshold = buf.len()/2;
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UnsafeWriter {
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inner: inner,
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buf: buf,
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||||
pos: 0,
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threshold: threshold,
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||||
}
|
||||
}
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|
||||
fn flush_buf(&mut self) -> IoResult<()> {
|
||||
if self.pos != 0 {
|
||||
let ret = self.inner.write(self.buf.slice_to(self.pos));
|
||||
self.pos = 0;
|
||||
ret
|
||||
} else {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
fn possibly_flush(&mut self) {
|
||||
if self.pos > self.threshold {
|
||||
self.inner.write(self.buf.slice_to(self.pos)).unwrap();
|
||||
self.pos = 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[inline(never)]
|
||||
fn fail() -> ! {
|
||||
fail!("assertion failed");
|
||||
}
|
||||
|
||||
impl<'a, W: Writer> Writer for UnsafeWriter<'a, W> {
|
||||
fn write(&mut self, buf: &[u8]) -> IoResult<()> {
|
||||
let dst = self.buf.mut_slice_from(self.pos);
|
||||
if buf.len() > dst.len() {
|
||||
fail();
|
||||
}
|
||||
unsafe {
|
||||
copy_nonoverlapping_memory(dst.as_mut_ptr(), buf.as_ptr(), buf.len())
|
||||
}
|
||||
self.pos += buf.len();
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn flush(&mut self) -> IoResult<()> {
|
||||
self.flush_buf().and_then(|()| self.inner.flush())
|
||||
}
|
||||
}
|
||||
|
||||
#[unsafe_destructor]
|
||||
impl<'a, W: Writer> Drop for UnsafeWriter<'a, W> {
|
||||
fn drop(&mut self) {
|
||||
let _ = self.flush_buf();
|
||||
}
|
||||
}
|
||||
|
||||
/* vim: set ai ts=4 sw=4 sts=4 et : */
|
||||
|
|
|
|||
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