/usr/share/clang/scan-build-py-4.0/libscanbuild/shell.py is in clang-tools-4.0 1:4.0.1-10~deb9u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | # -*- coding: utf-8 -*-
# The LLVM Compiler Infrastructure
#
# This file is distributed under the University of Illinois Open Source
# License. See LICENSE.TXT for details.
""" This module implements basic shell escaping/unescaping methods. """
import re
import shlex
__all__ = ['encode', 'decode']
def encode(command):
""" Takes a command as list and returns a string. """
def needs_quote(word):
""" Returns true if arguments needs to be protected by quotes.
Previous implementation was shlex.split method, but that's not good
for this job. Currently is running through the string with a basic
state checking. """
reserved = {' ', '$', '%', '&', '(', ')', '[', ']', '{', '}', '*', '|',
'<', '>', '@', '?', '!'}
state = 0
for current in word:
if state == 0 and current in reserved:
return True
elif state == 0 and current == '\\':
state = 1
elif state == 1 and current in reserved | {'\\'}:
state = 0
elif state == 0 and current == '"':
state = 2
elif state == 2 and current == '"':
state = 0
elif state == 0 and current == "'":
state = 3
elif state == 3 and current == "'":
state = 0
return state != 0
def escape(word):
""" Do protect argument if that's needed. """
table = {'\\': '\\\\', '"': '\\"'}
escaped = ''.join([table.get(c, c) for c in word])
return '"' + escaped + '"' if needs_quote(word) else escaped
return " ".join([escape(arg) for arg in command])
def decode(string):
""" Takes a command string and returns as a list. """
def unescape(arg):
""" Gets rid of the escaping characters. """
if len(arg) >= 2 and arg[0] == arg[-1] and arg[0] == '"':
arg = arg[1:-1]
return re.sub(r'\\(["\\])', r'\1', arg)
return re.sub(r'\\([\\ $%&\(\)\[\]\{\}\*|<>@?!])', r'\1', arg)
return [unescape(arg) for arg in shlex.split(string)]
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