df: implement -B n<suff> and -B <suff> formats of -B option

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

libbb/xatonum.c

@@ -96,3 +96,22 @@ const struct suffix_mult cwbkMG_suffixes[] = {
 	/* coreutils also understands TPEZY suffixes for tera- and so on, with B suffix for decimal */
 	{ "", 0 }
 };
+
+const struct suffix_mult kmg_i_suffixes[] = {
+	{ "KiB", 1024 },
+	{ "kiB", 1024 },
+	{ "K", 1024 },
+	{ "k", 1024 },
+	{ "MiB", 1048576 },
+	{ "miB", 1048576 },
+	{ "M", 1048576 },
+	{ "m", 1048576 },
+	{ "GiB", 1073741824 },
+	{ "giB", 1073741824 },
+	{ "G", 1073741824 },
+	{ "g", 1073741824 },
+	{ "KB", 1000 },
+	{ "MB", 1000000 },
+	{ "GB", 1000000000 },
+	{ "", 0 }
+};