From 900eb9bca18f57531bc74d3a5f5b5e87870cd1ae Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Sun, 5 Apr 2026 19:59:30 -0400
Subject: Replace cc65 lib isdigit() and atoi() with less bloated isnum() and
 a2uint().

---
 src/isnum.s | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 src/isnum.s

(limited to 'src/isnum.s')

diff --git a/src/isnum.s b/src/isnum.s
new file mode 100644
index 0000000..7aa3251
--- /dev/null
+++ b/src/isnum.s
@@ -0,0 +1,18 @@
+
+ .export _isnum
+
+ ; isdigit() replacement that avoids cc65's ctype bloat.
+ ; returns 0 in A/X for non-digit, non-zero for digit.
+ ; *also* when calling from asm, the Z flag is set for
+ ; non-digit, clear for digit.
+_isnum:
+ cmp #'0'
+ bcc ret0
+ cmp #'9'+1
+ bcs ret0
+ lda #1
+ .byte $2c
+ret0:
+ lda #0
+ tax
+ rts
-- 
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