From: Lukas Krickl <lukas@krickl.dev>
Date: Sat, 23 Aug 2025 05:43:53 +0000 (+0200)
Subject: strings: Added decimal printing
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=f5c61bb3b4e179d16af32c6b4c28f18b6e70e099;p=gbrg%2F.git

strings: Added decimal printing
---

diff --git a/src/strings.s b/src/strings.s
index edb2302..d43a961 100644
--- a/src/strings.s
+++ b/src/strings.s
@@ -81,12 +81,58 @@ puts:
   jr puts REL
 @done:
   ret
-	
+
+	; counts how many times
+	; a number fits into n
+	; inputs:
+	;		a: a number
+	;		$1: factor 
+	;	returns:
+	;		b: count
+#macro putn_count
+.beginscope
+	ld b, 0
+@again:
+		cp a, $1
+		jr z, @done REL
+		jr c, @done REL
+		sub a, $1	
+		inc b
+	jr @again REL
+@done:
+.endscope
+#endmacro
+
 	; prints a number in decimal
 	; input:
 	;	 de: tile location
 	;		a: the value
 putn:
+	putn_count 100
+	; print 100s if > 0
+	push af
+	ld a, b
+	cp a, 0
+	jr z, @skip_100s REL
+		add a, FONT_OFFSET+1
+		ld [de], a	
+		inc de
+@skip_100s:
+	pop af
+
+	putn_count 10
+	; print 10s if > 0
+	push af
+	ld a, b
+	cp a, 0
+	jr z, @skip_10s REL
+		add a, FONT_OFFSET+1
+		ld [de], a
+		inc de
+@skip_10s:
+	pop af
+	
+	; print remainder
 	add a, FONT_OFFSET+1
 	ld [de], a
 	ret