2002-08-11  Jody Goldberg <jody@gnome.org>

	* ms-formula-read.c (ms_excel_parse_formula) : add bounds testing to
	  reading const strings.  It will save us from corrupt data, and
	  rescue us from the misexported xls in 1.0.6,1.0.7

	* ms-excel-read.c (biff_xf_data_new) : read shrink to fit.
	(ms_excel_parse_NAME) : Ignore 0 length expressions.

	* ms-formula-read.c (expr_tree_error) : new.
	(parse_list_pop) : use it more loudly here.
	(ms_excel_parse_formula) : and here.