/**
* g_shell_unquote:
* @quoted_string: shell-quoted string
* @error: error return location or NULL
*
* Unquotes a string as the shell (/bin/sh) would. Only handles
* quotes; if a string contains file globs, arithmetic operators,
* variables, backticks, redirections, or other special-to-the-shell
* features, the result will be different from the result a real shell
* would produce (the variables, backticks, etc. will be passed
* through literally instead of being expanded). This function is
* guaranteed to succeed if applied to the result of
* g_shell_quote(). If it fails, it returns %NULL and sets the
* error. The @quoted_string need not actually contain quoted or
* escaped text; g_shell_unquote() simply goes through the string and
* unquotes/unescapes anything that the shell would. Both single and
* double quotes are handled, as are escapes including escaped
* newlines. The return value must be freed with g_free(). Possible
* errors are in the #G_SHELL_ERROR domain.
*
* Shell quoting rules are a bit strange. Single quotes preserve the
* literal string exactly. escape sequences are not allowed; not even
* \' - if you want a ' in the quoted text, you have to do something
* like 'foo'\''bar'. Double quotes allow $, `, ", \, and newline to
* be escaped with backslash. Otherwise double quotes preserve things
* literally.
*
* Returns: an unquoted string
**/
std::string
g_shell_unquote (std::string& quoted_string)
{
std::string unquoted = quoted_string;
std::string retval;
std::string::iterator start = quoted_string.begin();
/* The loop allows cases such as
* "foo"blah blah'bar'woo foo"baz"la la la\'\''foo'
*/
while(start != quoted_string.end()) {
/* Append all non-quoted chars, honoring backslash escape
*/
while ((start != quoted_string.end()) &&
not (*start == '"' or *start == '\'')) {
if (*start == '\\') {
/* all characters can get escaped by backslash,
* except newline, which is removed if it follows
* a backslash outside of quotes
*/
start ++;
if (start != quoted_string.end()) {
if (*start != '\n') {
retval += *start;
}
start ++;
}
} else {
retval += *start;
start++;
}
}
if (start != quoted_string.end())
{
std::pair<std::string, std::string::iterator> res =
unquote_string_inplace (start, quoted_string.end());
retval += res.first;
start = res.second;
}
}
return retval;
}
/**
* Unquotes a string as the shell (/bin/sh) would. Only handles
* quotes; if a string contains file globs, arithmetic operators,
* variables, backticks, redirections, or other special-to-the-shell
* features, the result will be different from the result a real shell
* would produce (the variables, backticks, etc. will be passed
* through literally instead of being expanded). This function is
* guaranteed to succeed if applied to the result of
* _dbus_shell_quote(). If it fails, it returns %NULL.
* The @quoted_string need not actually contain quoted or
* escaped text; _dbus_shell_unquote() simply goes through the string and
* unquotes/unescapes anything that the shell would. Both single and
* double quotes are handled, as are escapes including escaped
* newlines. The return value must be freed with dbus_free().
*
* Shell quoting rules are a bit strange. Single quotes preserve the
* literal string exactly. escape sequences are not allowed; not even
* \' - if you want a ' in the quoted text, you have to do something
* like 'foo'\''bar'. Double quotes allow $, `, ", \, and newline to
* be escaped with backslash. Otherwise double quotes preserve things
* literally.
*
* @quoted_string: shell-quoted string
**/
char*
_dbus_shell_unquote (const char *quoted_string)
{
char *unquoted;
char *end;
char *start;
char *ret;
DBusString retval;
unquoted = _dbus_strdup (quoted_string);
if (unquoted == NULL)
return NULL;
start = unquoted;
end = unquoted;
if (!_dbus_string_init (&retval))
{
dbus_free (unquoted);
return NULL;
}
/* The loop allows cases such as
* "foo"blah blah'bar'woo foo"baz"la la la\'\''foo'
*/
while (*start)
{
/* Append all non-quoted chars, honoring backslash escape
*/
while (*start && !(*start == '"' || *start == '\''))
{
if (*start == '\\')
{
/* all characters can get escaped by backslash,
* except newline, which is removed if it follows
* a backslash outside of quotes
*/
++start;
if (*start)
{
if (*start != '\n')
{
if (!_dbus_string_append_byte (&retval, *start))
goto error;
}
++start;
}
}
else
{
if (!_dbus_string_append_byte (&retval, *start))
goto error;
++start;
}
}
if (*start)
{
if (!unquote_string_inplace (start, &end))
goto error;
else
{
if (!_dbus_string_append (&retval, start))
goto error;
start = end;
}
}
}
ret = _dbus_strdup (_dbus_string_get_data (&retval));
if (!ret)
goto error;
dbus_free (unquoted);
_dbus_string_free (&retval);
return ret;
error:
dbus_free (unquoted);
_dbus_string_free (&retval);
return NULL;
}
