status.i4.v = str_printable_length_c(string.i1a.r [,length.i4.v]

	This routine returns the length of a string up to the first
	nonprintable character.

	string		string to determine the length of
	[length]	length of string (If a value of zero is passed
			or this argument is defaulted, the length of the
			string will be calculated.)
			(default is 0)
	[options]	scanning options
			(STR_OPT_NONE -> no options selected (default))

	This function returns status values as follows:

	printable length

	This function requires the following include files:


	Related functions:

	str_is_printable_c, str_make_printable_c, str_remove_nonprintables_c,
	str_length_c, str_nonblank_length_c, str_is_upper_case_c,
	str_is_lower_case_c, str_is_alphabetic_c, str_is_alphanumeric_c,
	str_is_numeric_c, str_is_float_string_c, str_is_hex_c, str_is_blank_c,
	str_is_white_space_c, str_num_nonblank_c, str_compare_nocase,
	str_compare_n_nocase_c, strncmp, strcmp, strncmx, str_find_first_c,

	C/C++ usage:

	static const char	string[] = "abcd";
	int	status;
	int	length = 0;
	unsigned int	options = STR_OPT_NONE;

	status = str_printable_length_c(string,length,options);