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79 lines
3.2 KiB
PowerShell
79 lines
3.2 KiB
PowerShell
# Copyright (c) 2017 Ansible Project
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# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
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# The rules used in these functions are derived from the below
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# https://docs.microsoft.com/en-us/cpp/cpp/parsing-cpp-command-line-arguments
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# https://blogs.msdn.microsoft.com/twistylittlepassagesallalike/2011/04/23/everyone-quotes-command-line-arguments-the-wrong-way/
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Function Escape-Argument($argument, $force_quote = $false) {
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# this converts a single argument to an escaped version, use Join-Arguments
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# instead of this function as this only escapes a single string.
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# check if argument contains a space, \n, \t, \v or "
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if ($force_quote -eq $false -and $argument.Length -gt 0 -and $argument -notmatch "[ \n\t\v`"]") {
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# argument does not need escaping (and we don't want to force it),
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# return as is
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return $argument
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}
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else {
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# we need to quote the arg so start with "
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$new_argument = '"'
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for ($i = 0; $i -lt $argument.Length; $i++) {
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$num_backslashes = 0
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# get the number of \ from current char until end or not a \
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while ($i -ne ($argument.Length - 1) -and $argument[$i] -eq "\") {
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$num_backslashes++
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$i++
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}
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$current_char = $argument[$i]
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if ($i -eq ($argument.Length - 1) -and $current_char -eq "\") {
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# We are at the end of the string so we need to add the same \
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# * 2 as the end char would be a "
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$new_argument += ("\" * ($num_backslashes + 1) * 2)
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}
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elseif ($current_char -eq '"') {
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# we have a inline ", we need to add the existing \ but * by 2
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# plus another 1
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$new_argument += ("\" * (($num_backslashes * 2) + 1))
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$new_argument += $current_char
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}
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else {
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# normal character so no need to escape the \ we have counted
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$new_argument += ("\" * $num_backslashes)
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$new_argument += $current_char
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}
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}
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# we need to close the special arg with a "
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$new_argument += '"'
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return $new_argument
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}
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}
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Function Argv-ToString($arguments, $force_quote = $false) {
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# Takes in a list of un escaped arguments and convert it to a single string
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# that can be used when starting a new process. It will escape the
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# characters as necessary in the list.
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# While there is a CommandLineToArgvW function there is a no
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# ArgvToCommandLineW that we can call to convert a list to an escaped
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# string.
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# You can also pass in force_quote so that each argument is quoted even
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# when not necessary, by default only arguments with certain characters are
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# quoted.
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# TODO: add in another switch which will escape the args for cmd.exe
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$escaped_arguments = @()
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foreach ($argument in $arguments) {
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$escaped_argument = Escape-Argument -argument $argument -force_quote $force_quote
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$escaped_arguments += $escaped_argument
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}
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return ($escaped_arguments -join ' ')
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}
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# this line must stay at the bottom to ensure all defined module parts are exported
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Export-ModuleMember -Alias * -Function * -Cmdlet *
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