simplify EMIT and add "dot" for number display

diff --git a/stdio.asm b/stdio.asm
index 5767d8b8258be3c1b11fd92d67832ce6245cbfa6..a6cf5128683ce1f121855560ec4e181ed837f2c9 100644 (file)
--- a/stdio.asm
+++ b/stdio.asm
@@ -32,7 +32,7 @@
 ;;; * block address
 ;;; * -1
 ;;; * size of block
-;;; * current read position (starts at 8 = after block size)
+;;; * current read position
 
        WORD p_stream,'STREAM',fasm
        ;; ( fd size -- addr ) or ( block -1 -- addr )
@@ -187,19 +187,17 @@ p_read_word_nomore:
        popr rsi
        next
 
-p_emit_buffer: dq 0
-       
        WORD p_emit,'EMIT',fasm
        ;; ( c -- )
        ;; Write byte to stdout
        pushr rsi
-       pop rax
-       mov [p_emit_buffer],al
+       mov rax,rsp
        push 1
-       push p_emit_buffer
+       push rax
        push 1
        DOFORTH sys_write
-       pop rax
+       pop rax                 ; ignore return value
+       pop rax                 ; drop input data
         popr rsi
        next
 
@@ -212,4 +210,36 @@ p_emit_buffer:     dq 0
        ;; ( -- c )
        ;; Pushes a space character on the stack
        dq 10
-       
+
+       WORD p_digits,'DIGITS',dovariable
+       db '0123456789abcdef'
+
+       WORD p_dot,'.',fasm
+       ;; ( v -- )
+       ;; Print TOP value as unsigned BASE integer
+       pushr rsi
+       mov rax,qword [rsp]
+       cmp rax,0
+       jge p_dot_positive
+       cmp qword [p_base_DFA],10
+       jne p_dot_positive
+       push '-'
+       DOFORTH p_emit
+       mov rax,qword [rsp]
+       neg rax
+p_dot_positive:
+       xor rdx,rdx
+       div qword [p_base_DFA]  ; rdx:rax / BASE => q=rax, r=rdx
+       mov qword [rsp],rdx 
+       cmp rax,0
+       je p_dot_remainder
+       push rax
+       DOFORTH p_dot
+p_dot_remainder:
+       pop rdx
+       xor rax,rax
+       mov al,[p_digits_DFA+rdx]
+       push rax
+       DOFORTH p_emit
+       popr rsi
+       next