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- # subprocess - Subprocesses with accessible I/O streams
- #
- # For more information about this module, see PEP 324.
- #
- # This module should remain compatible with Python 2.2, see PEP 291.
- #
- # Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
- #
- # Licensed to PSF under a Contributor Agreement.
- # See http://www.python.org/2.4/license for licensing details.
- def list2cmdline(seq):
- """
- Translate a sequence of arguments into a command line
- string, using the same rules as the MS C runtime:
- 1) Arguments are delimited by white space, which is either a
- space or a tab.
- 2) A string surrounded by double quotation marks is
- interpreted as a single argument, regardless of white space
- contained within. A quoted string can be embedded in an
- argument.
- 3) A double quotation mark preceded by a backslash is
- interpreted as a literal double quotation mark.
- 4) Backslashes are interpreted literally, unless they
- immediately precede a double quotation mark.
- 5) If backslashes immediately precede a double quotation mark,
- every pair of backslashes is interpreted as a literal
- backslash. If the number of backslashes is odd, the last
- backslash escapes the next double quotation mark as
- described in rule 3.
- """
- # See
- # http://msdn.microsoft.com/library/en-us/vccelng/htm/progs_12.asp
- result = []
- needquote = False
- for arg in seq:
- bs_buf = []
- # Add a space to separate this argument from the others
- if result:
- result.append(' ')
- needquote = (" " in arg) or ("\t" in arg) or ("|" in arg) or arg == ""
- if needquote:
- result.append('"')
- for c in arg:
- if c == '\\':
- # Don't know if we need to double yet.
- bs_buf.append(c)
- elif c == '"':
- # Double backspaces.
- result.append('\\' * len(bs_buf)*2)
- bs_buf = []
- result.append('\\"')
- else:
- # Normal char
- if bs_buf:
- result.extend(bs_buf)
- bs_buf = []
- result.append(c)
- # Add remaining backspaces, if any.
- if bs_buf:
- result.extend(bs_buf)
- if needquote:
- result.extend(bs_buf)
- result.append('"')
-
- return ''.join(result)
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