corrodeにBSDなcatをかけてみた

cat.c

/*	$OpenBSD: cat.c,v 1.26 2016/10/19 18:20:25 schwarze Exp $	*/
/*	$NetBSD: cat.c,v 1.11 1995/09/07 06:12:54 jtc Exp $	*/

/*
 * Copyright (c) 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kevin Fall.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define MAXIMUM(a, b)	(((a) > (b)) ? (a) : (b))

extern char *__progname;

int bflag, eflag, nflag, sflag, tflag, vflag;
int rval;
char *filename;

void cook_args(char **argv);
void cook_buf(FILE *);
void raw_args(char **argv);
void raw_cat(int);

int
main()
{
	int argc;
	char **argv;
	int ch;

#if 0
	if (pledge("stdio rpath", NULL) == -1)
		err(1, "pledge");
#endif

	while ((ch = getopt(argc, argv, "benstuv")) != -1)
		switch (ch) {
		case 'b':
			bflag = nflag = 1;	/* -b implies -n */
			break;
		case 'e':
			eflag = vflag = 1;	/* -e implies -v */
			break;
		case 'n':
			nflag = 1;
			break;
		case 's':
			sflag = 1;
			break;
		case 't':
			tflag = vflag = 1;	/* -t implies -v */
			break;
		case 'u':
			setvbuf(stdout, NULL, _IONBF, 0);
			break;
		case 'v':
			vflag = 1;
			break;
		default:
			(void)fprintf(stderr,
			    "usage: %s [-benstuv] [file ...]\n", __progname);
			return 1;
		}
	argv += optind;

	if (bflag || eflag || nflag || sflag || tflag || vflag)
		cook_args(argv);
	else
		raw_args(argv);
	if (fclose(stdout))
		err(1, "stdout");
	return rval;
}

void
cook_args(char **argv)
{
	FILE *fp;

	fp = stdin;
	filename = "stdin";
	do {
		if (*argv) {
			if (!strcmp(*argv, "-"))
				fp = stdin;
			else if ((fp = fopen(*argv, "r")) == NULL) {
				warn("%s", *argv);
				rval = 1;
				++argv;
				continue;
			}
			filename = *argv++;
		}
		cook_buf(fp);
		if (fp == stdin)
			clearerr(fp);
		else
			(void)fclose(fp);
	} while (*argv);
}

void
cook_buf(FILE *fp)
{
	int ch, gobble, line, prev;

	line = gobble = 0;
	for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
		if (prev == '\n') {
			if (sflag) {
				if (ch == '\n') {
					if (gobble)
						continue;
					gobble = 1;
				} else
					gobble = 0;
			}
			if (nflag) {
				if (!bflag || ch != '\n') {
					(void)fprintf(stdout, "%6d\t", ++line);
					if (ferror(stdout))
						break;
				} else if (eflag) {
					(void)fprintf(stdout, "%6s\t", "");
					if (ferror(stdout))
						break;
				}
			}
		}
		if (ch == '\n') {
			if (eflag && putchar('$') == EOF)
				break;
		} else if (ch == '\t') {
			if (tflag) {
				if (putchar('^') == EOF || putchar('I') == EOF)
					break;
				continue;
			}
		} else if (vflag) {
			if (!isascii(ch)) {
				if (putchar('M') == EOF || putchar('-') == EOF)
					break;
				ch = toascii(ch);
			}
			if (iscntrl(ch)) {
				if (putchar('^') == EOF ||
				    putchar(ch == '\177' ? '?' :
				    ch | 0100) == EOF)
					break;
				continue;
			}
		}
		if (putchar(ch) == EOF)
			break;
	}
	if (ferror(fp)) {
		warn("%s", filename);
		rval = 1;
		clearerr(fp);
	}
	if (ferror(stdout))
		err(1, "stdout");
}

void
raw_args(char **argv)
{
	int fd;

	fd = fileno(stdin);
	filename = "stdin";
	do {
		if (*argv) {
			if (!strcmp(*argv, "-"))
				fd = fileno(stdin);
			else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
				warn("%s", *argv);
				rval = 1;
				++argv;
				continue;
			}
			filename = *argv++;
		}
		raw_cat(fd);
		if (fd != fileno(stdin))
			(void)close(fd);
	} while (*argv);
}

void
raw_cat(int rfd)
{
	int wfd;
	ssize_t nr, nw, off;
	static size_t bsize;
	static char *buf = NULL;
	struct stat sbuf;

	wfd = fileno(stdout);
	if (buf == NULL) {
		if (fstat(wfd, &sbuf))
			err(1, "stdout");
		bsize = MAXIMUM(sbuf.st_blksize, BUFSIZ);
		if ((buf = malloc(bsize)) == NULL)
			err(1, "malloc");
	}
	while ((nr = read(rfd, buf, bsize)) != -1 && nr != 0)
		for (off = 0; nr; nr -= nw, off += nw)
			if ((nw = write(wfd, buf + off, (size_t)nr)) == 0 ||
			     nw == -1)
				err(1, "stdout");
	if (nr < 0) {
		warn("%s", filename);
		rval = 1;
	}
}

cat.rs

extern {
    static mut __progname : *mut u8;
    fn clearerr(__stream : *mut _IO_FILE);
    fn close(__fd : i32) -> i32;
    fn err(__status : i32, __format : *const u8, ...);
    fn fclose(__stream : *mut _IO_FILE) -> i32;
    fn ferror(__stream : *mut _IO_FILE) -> i32;
    fn fileno(__stream : *mut _IO_FILE) -> i32;
    fn fopen(
        __filename : *const u8, __modes : *const u8
    ) -> *mut _IO_FILE;
    fn fprintf(
        __stream : *mut _IO_FILE, __format : *const u8, ...
    ) -> i32;
    fn fstat(__fd : i32, __buf : *mut stat) -> i32;
    fn getc(__stream : *mut _IO_FILE) -> i32;
    fn getopt(
        ___argc : i32, ___argv : *const *mut u8, __shortopts : *const u8
    ) -> i32;
    fn isascii(__c : i32) -> i32;
    fn iscntrl(arg1 : i32) -> i32;
    fn malloc(__size : usize) -> *mut ::std::os::raw::c_void;
    fn open(__file : *const u8, __oflag : i32, ...) -> i32;
    static mut optind : i32;
    fn putchar(__c : i32) -> i32;
    fn read(
        __fd : i32, __buf : *mut ::std::os::raw::c_void, __nbytes : usize
    ) -> isize;
    fn setvbuf(
        __stream : *mut _IO_FILE,
        __buf : *mut u8,
        __modes : i32,
        __n : usize
    ) -> i32;
    static mut stderr : *mut _IO_FILE;
    static mut stdin : *mut _IO_FILE;
    static mut stdout : *mut _IO_FILE;
    fn strcmp(__s1 : *const u8, __s2 : *const u8) -> i32;
    fn toascii(__c : i32) -> i32;
    fn warn(__format : *const u8, ...);
    fn write(
        __fd : i32, __buf : *const ::std::os::raw::c_void, __n : usize
    ) -> isize;
}

enum _IO_FILE {
}

#[no_mangle]
pub static mut bflag : i32 = 0i32;

#[no_mangle]
pub static mut eflag : i32 = 0i32;

#[no_mangle]
pub static mut nflag : i32 = 0i32;

#[no_mangle]
pub static mut sflag : i32 = 0i32;

#[no_mangle]
pub static mut tflag : i32 = 0i32;

#[no_mangle]
pub static mut vflag : i32 = 0i32;

#[no_mangle]
pub static mut rval : i32 = 0i32;

#[no_mangle]
pub static mut filename : *mut u8 = 0 as (*mut u8);

fn main() {
    let ret = unsafe { _c_main() };
    ::std::process::exit(ret);
}

#[no_mangle]
pub unsafe extern fn _c_main() -> i32 {
    let mut _currentBlock;
    let mut argc : i32;
    let mut argv : *mut *mut u8;
    let mut ch : i32;
    'loop1: loop {
        if !({
                 ch = getopt(
                          argc,
                          argv as (*const *mut u8),
                          (*b"benstuv\0").as_ptr()
                      );
                 ch
             } != -1i32) {
            _currentBlock = 2;
            break;
        }
        if ch == b'v' as (i32) {
            vflag = 1i32;
        } else if ch == b'u' as (i32) {
            setvbuf(
                stdout,
                0i32 as (*mut ::std::os::raw::c_void) as (*mut u8),
                2i32,
                0usize
            );
        } else if ch == b't' as (i32) {
            tflag = {
                        vflag = 1i32;
                        vflag
                    };
        } else if ch == b's' as (i32) {
            sflag = 1i32;
        } else if ch == b'n' as (i32) {
            nflag = 1i32;
        } else if ch == b'e' as (i32) {
            eflag = {
                        vflag = 1i32;
                        vflag
                    };
        } else {
            if !(ch == b'b' as (i32)) {
                _currentBlock = 15;
                break;
            }
            bflag = {
                        nflag = 1i32;
                        nflag
                    };
        }
    }
    if _currentBlock == 2 {
        argv = argv.offset(optind as (isize));
        if bflag != 0 || eflag != 0 || nflag != 0 || sflag != 0 || tflag != 0 || vflag != 0 {
            cook_args(argv);
        } else {
            raw_args(argv);
        }
        if fclose(stdout) != 0 {
            err(1i32,(*b"stdout\0").as_ptr());
        }
        rval
    } else {
        fprintf(
            stderr,
            (*b"usage: %s [-benstuv] [file ...]\n\0").as_ptr(),
            __progname
        );
        1i32
    }
}

#[no_mangle]
pub unsafe extern fn cook_args(mut argv : *mut *mut u8) {
    let mut _currentBlock;
    let mut fp : *mut _IO_FILE;
    fp = stdin;
    filename = (*b"stdin\0").as_ptr() as (*mut u8);
    'loop1: loop {
        if !(*argv).is_null() {
            if strcmp(*argv as (*const u8),(*b"-\0").as_ptr()) == 0 {
                fp = stdin;
                _currentBlock = 6;
            } else if {
                          fp = fopen(*argv as (*const u8),(*b"r\0").as_ptr());
                          fp
                      } == 0i32 as (*mut ::std::os::raw::c_void) as (*mut _IO_FILE) {
                warn((*b"%s\0").as_ptr(),*argv);
                rval = 1i32;
                argv = argv.offset(1isize);
                _currentBlock = 10;
            } else {
                _currentBlock = 6;
            }
            if _currentBlock == 10 {
            } else {
                filename = *{
                                let _old = argv;
                                argv = argv.offset(1isize);
                                _old
                            };
                _currentBlock = 7;
            }
        } else {
            _currentBlock = 7;
        }
        if _currentBlock == 7 {
            cook_buf(fp);
            if fp == stdin {
                clearerr(fp);
            } else {
                fclose(fp);
            }
        }
        if (*argv).is_null() {
            break;
        }
    }
}

#[no_mangle]
pub unsafe extern fn cook_buf(mut fp : *mut _IO_FILE) {
    let mut _currentBlock;
    let mut ch : i32;
    let mut gobble : i32;
    let mut line : i32;
    let mut prev : i32;
    line = {
               gobble = 0i32;
               gobble
           };
    prev = b'\n' as (i32);
    'loop1: loop {
        if !({
                 ch = getc(fp);
                 ch
             } != -1i32) {
            break;
        }
        if prev == b'\n' as (i32) {
            if sflag != 0 {
                if ch == b'\n' as (i32) {
                    if gobble != 0 {
                        _currentBlock = 30;
                    } else {
                        gobble = 1i32;
                        _currentBlock = 8;
                    }
                } else {
                    gobble = 0i32;
                    _currentBlock = 8;
                }
            } else {
                _currentBlock = 8;
            }
            if _currentBlock == 30 {
            } else if nflag != 0 {
                if bflag == 0 || ch != b'\n' as (i32) {
                    fprintf(
                        stdout,
                        (*b"%6d\t\0").as_ptr(),
                        {
                            line = line + 1;
                            line
                        }
                    );
                    if ferror(stdout) != 0 {
                        break;
                    }
                } else if eflag != 0 {
                    fprintf(stdout,(*b"%6s\t\0").as_ptr(),(*b"\0").as_ptr());
                    if ferror(stdout) != 0 {
                        break;
                    }
                }
                _currentBlock = 13;
            } else {
                _currentBlock = 13;
            }
        } else {
            _currentBlock = 13;
        }
        if _currentBlock == 13 {
            if ch == b'\n' as (i32) {
                if eflag != 0 && (putchar(b'$' as (i32)) == -1i32) {
                    break;
                }
                _currentBlock = 24;
            } else if ch == b'\t' as (i32) {
                if tflag != 0 {
                    if putchar(b'^' as (i32)) == -1i32 || putchar(
                                                              b'I' as (i32)
                                                          ) == -1i32 {
                        break;
                    }
                    _currentBlock = 30;
                } else {
                    _currentBlock = 24;
                }
            } else if vflag != 0 {
                if isascii(ch) == 0 {
                    if putchar(b'M' as (i32)) == -1i32 || putchar(
                                                              b'-' as (i32)
                                                          ) == -1i32 {
                        break;
                    }
                    ch = toascii(ch);
                }
                if iscntrl(ch) != 0 {
                    if putchar(b'^' as (i32)) == -1i32 || putchar(
                                                              if ch == b'\x7F' as (i32) {
                                                                  b'?' as (i32)
                                                              } else {
                                                                  ch | 0o100i32
                                                              }
                                                          ) == -1i32 {
                        break;
                    }
                    _currentBlock = 30;
                } else {
                    _currentBlock = 24;
                }
            } else {
                _currentBlock = 24;
            }
            if _currentBlock == 30 {
            } else if putchar(ch) == -1i32 {
                break;
            }
        }
        prev = ch;
    }
    if ferror(fp) != 0 {
        warn((*b"%s\0").as_ptr(),filename);
        rval = 1i32;
        clearerr(fp);
    }
    if ferror(stdout) != 0 {
        err(1i32,(*b"stdout\0").as_ptr());
    }
}

#[no_mangle]
pub unsafe extern fn raw_args(mut argv : *mut *mut u8) {
    let mut _currentBlock;
    let mut fd : i32;
    fd = fileno(stdin);
    filename = (*b"stdin\0").as_ptr() as (*mut u8);
    'loop1: loop {
        if !(*argv).is_null() {
            if strcmp(*argv as (*const u8),(*b"-\0").as_ptr()) == 0 {
                fd = fileno(stdin);
                _currentBlock = 6;
            } else if {
                          fd = open(*argv as (*const u8),0o0i32,0i32);
                          fd
                      } < 0i32 {
                warn((*b"%s\0").as_ptr(),*argv);
                rval = 1i32;
                argv = argv.offset(1isize);
                _currentBlock = 9;
            } else {
                _currentBlock = 6;
            }
            if _currentBlock == 9 {
            } else {
                filename = *{
                                let _old = argv;
                                argv = argv.offset(1isize);
                                _old
                            };
                _currentBlock = 7;
            }
        } else {
            _currentBlock = 7;
        }
        if _currentBlock == 7 {
            raw_cat(fd);
            if fd != fileno(stdin) {
                close(fd);
            }
        }
        if (*argv).is_null() {
            break;
        }
    }
}

#[derive(Copy)]
#[repr(C)]
pub struct timespec {
    pub tv_sec : isize,
    pub tv_nsec : isize,
}

impl Clone for timespec {
    fn clone(&self) -> Self { *self }
}

#[derive(Copy)]
#[repr(C)]
pub struct stat {
    pub st_dev : usize,
    pub st_ino : usize,
    pub st_nlink : usize,
    pub st_mode : u32,
    pub st_uid : u32,
    pub st_gid : u32,
    pub __pad0 : i32,
    pub st_rdev : usize,
    pub st_size : isize,
    pub st_blksize : isize,
    pub st_blocks : isize,
    pub st_atim : timespec,
    pub st_mtim : timespec,
    pub st_ctim : timespec,
    pub __glibc_reserved : [isize; 3],
}

impl Clone for stat {
    fn clone(&self) -> Self { *self }
}

#[no_mangle]
pub unsafe extern fn raw_cat(mut rfd : i32) {
    let mut wfd : i32;
    let mut nr : isize;
    let mut nw : isize;
    let mut off : isize;
    static mut bsize : usize = 0usize;
    static mut buf
        : *mut u8
        = 0i32 as (*mut ::std::os::raw::c_void) as (*mut u8);
    let mut sbuf : stat;
    wfd = fileno(stdout);
    if buf == 0i32 as (*mut ::std::os::raw::c_void) as (*mut u8) {
        if fstat(wfd,&mut sbuf as (*mut stat)) != 0 {
            err(1i32,(*b"stdout\0").as_ptr());
        }
        bsize = if sbuf.st_blksize > 8192isize {
                    sbuf.st_blksize
                } else {
                    8192isize
                } as (usize);
        if {
               buf = malloc(bsize) as (*mut u8);
               buf
           } == 0i32 as (*mut ::std::os::raw::c_void) as (*mut u8) {
            err(1i32,(*b"malloc\0").as_ptr());
        }
    }
    'loop5: loop {
        if !({
                 nr = read(rfd,buf as (*mut ::std::os::raw::c_void),bsize);
                 nr
             } != -1isize && (nr != 0isize)) {
            break;
        }
        off = 0isize;
        'loop10: loop {
            if nr == 0 {
                break;
            }
            if {
                   nw = write(
                            wfd,
                            buf.offset(off) as (*const ::std::os::raw::c_void),
                            nr as (usize)
                        );
                   nw
               } == 0isize || nw == -1isize {
                err(1i32,(*b"stdout\0").as_ptr());
            }
            nr = nr - nw;
            off = off + nw;
        }
    }
    if nr < 0isize {
        warn((*b"%s\0").as_ptr(),filename);
        rval = 1i32;
    }
}

run.log

$ rustc --version
$ rustc 1.33.0-beta.5 (1045131c1 2019-01-31)
 rustc cat.rs
warning: type `_IO_FILE` should have a camel case name
  --> cat.rs:46:6
   |
46 | enum _IO_FILE {
   |      ^^^^^^^^ help: convert the identifier to camel case: `IoFile`
   |
   = note: #[warn(non_camel_case_types)] on by default

error[E0446]: private type `_IO_FILE` in public interface
   --> cat.rs:200:1
    |
46  |   enum _IO_FILE {
    |   - `_IO_FILE` declared as private
...
200 | / pub unsafe extern fn cook_buf(mut fp : *mut _IO_FILE) {
201 | |     let mut _currentBlock;
202 | |     let mut ch : i32;
203 | |     let mut gobble : i32;
...   |
318 | |     }
319 | | }
    | |_^ can't leak private type

error: aborting due to previous error

For more information about this error, try `rustc --explain E0446`.