From f4e635c7b49321b5ba6f6a4609985aea4768d209 Mon Sep 17 00:00:00 2001
From: Tim Vaughan <tgvaughan@gmail.com>
Date: Thu, 21 Jul 2016 06:56:12 +1200
Subject: [PATCH] Debugging number->string

---
 scheme-primitives.4th | 27 ++++++++++++++++++++++++++-
 scheme.4th            |  2 +-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/scheme-primitives.4th b/scheme-primitives.4th
index 4cba91e..8e83f97 100644
--- a/scheme-primitives.4th
+++ b/scheme-primitives.4th
@@ -57,13 +57,38 @@
     drop fixnum-type
 ; make-primitive char->integer
 
-:noname ( args -- fixnum )
+:noname ( args -- char )
     2dup 1 ensure-arg-count
     car fixnum-type ensure-arg-type
 
     drop character-type
 ; make-primitive integer->char
 
+: build-fixnum-charlist ( num )
+    dup 0= if
+        nil
+    else
+        dup 10 / recurse
+        rot 10 mod [char] 0 + character-type 2swap
+        cons
+    then
+;
+:noname ( args -- string )
+    2dup 1 ensure-arg-count
+    car fixnum-type ensure-arg-type
+
+    drop
+
+    dup 0< swap abs ( bool num )
+    build-fixnum-charlist
+    rot drop
+    rot if
+        [char] - character-type 2swap cons
+    then
+
+    drop string-type
+; make-primitive number->string
+
 ( = Arithmeic = )
 
 : add-prim ( args -- fixnum )
diff --git a/scheme.4th b/scheme.4th
index 644ee19..ecbb91b 100644
--- a/scheme.4th
+++ b/scheme.4th
@@ -301,7 +301,7 @@ global-env setobj
             abort
 ;
 
-: ensure-arg-type ( arg type -- )
+: ensure-arg-type ( arg type -- arg )
     istype? false = if
         arg-type-error
     then
-- 
2.20.1