status.i4.v = str_find_last_string_c(source_string.i1a.r,
					     case_sensitive.i4.v, wildcard.i1.v,

	This routine finds the last occurrence of one string within another.

	source_string	string to be searched
	source_length	length of string to be searched  (If this argument
			has a value of zero, the routine will determine
			the length of the string.)
	match_string	string to be searched for
	match_length	length of string to be searched for  (If this argument
			has a value of zero, the routine will determine
			the length of the string.)
			(default is 0)
	case_sensitive	case sensitivity flag
			(TRUE -> case sensitive search,
			 FALSE -> case insensitive search (default))
	wildcard	wildcard character which will match any
			single character
			(STR_NO_WILDCARD -> don't use any wildcards (default),
			 otherwise -> desired wildcard character)
	ignore_spaces	white space handling flag
			(TRUE -> ignore embedded white spaces,
			 FALSE -> treat white spaces like any other character
	[next_string]	address of the next character in the source string
			(If a value of NULL is passed for this argument,
			no address will be returned.)
			(default is NULL)

	This function returns status values as follows:

	CLIB_INVARG		invalid argument passed
	CLIB_MEMFAIL		dynamic memory allocation failure
	0			string not found
	positive number		index of string found (starts at 1)

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	str_find_string_c, str_string_count_c, str_find_character_c,
	str_find_character_set_c, str_replace_string_c,
	str_replace_bracketed_c, str_replace_char_c,
	str_replace_char_set_c, strstr, strstr_nocase, str_compare_n_nocase_c,
	str_compare_nocase, strncmp, strcmp, strncmx, str_split_c,
	str_split_by_columns_c, str_get_bracketed_c, str_character_count_c,

	C/C++ usage:

	static const char	source_string[] = "This is a string.";
	static const char	match_string[] = "str";
	char	wildcard = STR_NO_WILDCARD;
	char	*next_string;
	int	status;
	int	source_length = 0;
	int	match_length = 0;
	int	case_sensitive = FALSE;
	int	ignore_spaces = TRUE;

	status = str_find_last_string_c(source_string,source_length,