Recognize 'L' as a length modifier for scanf.

Conversions using it will not actually work right yet (unless assignment is suppressed), because the necessary changes have not been made in SysFloat, but the infrastructure is now in place to allow for those changes.

stdio.asm

@@ -5590,29 +5590,31 @@ fm1	inc4	format	skip the '%'
 fm2	jsr	GetSize	get the field width specifier
 	sta	~scanWidth
 
-	lda	[format]	if the char is 'l', 'z', 't', or 'j' then
+	lda	[format]
 	and	#$00FF
-	cmp	#'l'
+	cmp	#'l'	'l' specifies long int or double
 	bne	fm2a
 	inc	~size
-	inc4	format	  check for 'll'
+	inc4	format	  unless it is 'll' for long long
 	lda	[format]
 	and	#$00FF
 	cmp	#'l'
 	bne	fm6
-	bra	fm2b
-fm2a	cmp	#'z'
+	bra	fm2c
+fm2a	cmp	#'z'	'z' specifies size_t (long int)
+	beq	fm2c
+	cmp	#'t'	't' specifies ptrdiff_t (long int)
+	beq	fm2c
+	cmp	#'j'	'j' specifies intmax_t (long long)
 	beq	fm2b
-	cmp	#'t'
-	beq	fm2b
-	cmp	#'j'	  'j' also specifies a long long size
+	cmp	#'L'	'L' specifies long double
 	bne	fm3
-	inc	~size
-fm2b	inc	~size	  long specifier
+fm2b	inc	~size
+fm2c	inc	~size
 	bra	fm4
-fm3	cmp	#'h'	else if it is an 'h' then
+fm3	cmp	#'h'	'h' specifies short int
 	bne	fm5
-	inc4	format	  check for 'hh'
+	inc4	format	  unless it is 'hh' for char types
 	lda	[format]
 	and	#$00FF
 	cmp	#'h'
@@ -5738,7 +5740,7 @@ ch	ds	2	temp storage
 ~scanError ds	2	set to 1 by scanners if an error occurs
 ~scanWidth ds	2	max # characters to scan
 ~size	 ds	2	size specifier; -1 -> char, 0 -> default,
-!			 1 -> long, 2 -> long long
+!			 1 -> long, 2 -> long long/long double
 	end
 
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