端子输出的安全逃逸功能 [英] Safe escape function for terminal output

问题描述

我正在寻找相当于 urlencode 的终端输出 - 我需要确保垃圾字符I（可能）从外部源打印不会最终对我的终端做好玩的事情，所以预先包装的功能来转义特殊字符序列将是理想的。

I'm looking for the equivalent of a urlencode for terminal output -- I need to make sure that garbage characters I (may) print from an external source don't end up doing funky things to my terminal, so a prepackaged function to escape special character sequences would be ideal.

我在Python中工作，但任何我都可以轻松翻译的作品。 TIA！

I'm working in Python, but anything I can readily translate works too. TIA!

推荐答案

$ ./command | cat -v

$ cat --help | grep nonprinting
-v, --show-nonprinting   use ^ and M- notation, except for LFD and TAB

这是基于 android / cat.c ：

#!/usr/bin/env python3
"""Emulate `cat -v` behaviour.

use ^ and M- notation, except for LFD and TAB

NOTE: python exits on ^Z in stdin on Windows
NOTE: newlines handling skewed towards interactive terminal. 
      Particularly, applying the conversion twice might *not* be a no-op
"""
import fileinput, sys

def escape(bytes):
    for b in bytes:
        assert 0 <= b < 0x100

        if  b in (0x09, 0x0a): # '\t\n' 
            yield b
            continue

        if  b > 0x7f: # not ascii
            yield 0x4d # 'M'
            yield 0x2d # '-'
            b &= 0x7f

        if  b < 0x20: # control char
            yield 0x5e # '^'
            b |= 0x40
        elif  b == 0x7f:
            yield 0x5e # '^'
            yield 0x3f # '?'
            continue

        yield b

if __name__ == '__main__':
    write_bytes = sys.stdout.buffer.write 
    for bytes in fileinput.input(mode="rb"):
        write_bytes(escape(bytes))

示例：

$ perl -e"print map chr,0..0xff" > bytes.bin 
$ cat -v bytes.bin  > cat-v.out 
$ python30 cat-v.py bytes.bin > python.out
$ diff -s cat-v.out python.out 

它打印：

Files cat-v.out and python.out are identical

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