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# This code must be source compatible with Python 2.4 through 3.3.
#
# Copyright 2003 Google Inc. All Rights Reserved.
"""Utility functions for dealing with command interpreters."""
import os
# Running windows?
win32 = (os.name == 'nt')
def ShellEscapeList(words):
"""Turn a list of words into a shell-safe string.
Args:
words: A list of words, e.g. for a command.
Returns:
A string of shell-quoted and space-separated words.
"""
if win32:
return ' '.join(words)
s = ''
for word in words:
# Single quote word, and replace each ' in word with '"'"'
s += "'" + word.replace("'", "'\"'\"'") + "' "
return s[:-1]
def ShellifyStatus(status):
"""Translate from a wait() exit status to a command shell exit status."""
if not win32:
if os.WIFEXITED(status):
# decode and return exit status
status = os.WEXITSTATUS(status)
else:
# On Unix, the wait() produces a 16 bit return code. Unix shells
# lossily compress this to an 8 bit value, using the formula below.
# Shell status code < 128 means the process exited normally, status
# code >= 128 means the process died because of a signal.
status = 128 + os.WTERMSIG(status)
return status