poor man's _toascii routine, contributed by Fatih Aygun

[cc65] / libsrc / c128 / cputc.s

diff --git a/libsrc/c128/cputc.s b/libsrc/c128/cputc.s
index d5ee8046da1598d4efb9467b026fffa3277940fe..5442e9f571f7dcb9aebd22c4d4343283e3716f9b 100644 (file)
--- a/libsrc/c128/cputc.s
+++ b/libsrc/c128/cputc.s
@@ -1,43 +1,76 @@
 ;
-; Ullrich von Bassewitz, 06.08.1998
+; Ullrich von Bassewitz, 2000-08-06, 2002-12-21
+; Using lots of code from MagerValp, MagerValp@cling.gu.se
 ;
 ; void cputcxy (unsigned char x, unsigned char y, char c);
 ; void cputc (char c);
 ;
 
-       .export         _cputcxy, _cputc, cputdirect, putchar
-       .export         newline, plot
+       .export         _cputcxy, _cputc, cputdirect, putchar
+       .export         newline, plot
         .constructor    initcputc
         .destructor     donecputc
-       .import         popa, _gotoxy
+       .import         popa, _gotoxy
         .import         PLOT
 
-       .include        "c128.inc"
+       .include        "c128.inc"
 
+cputdirect      = PRINT
+newline         = NEWLINE
+
+;--------------------------------------------------------------------------
+
+.code
 
 _cputcxy:
-       pha                     ; Save C
-       jsr     popa            ; Get Y
-       jsr     _gotoxy         ; Set cursor, drop x
-       pla                     ; Restore C
-       jmp     PRINT
+       pha                     ; Save C
+       jsr     popa            ; Get Y
+       jsr     _gotoxy         ; Set cursor, drop x
+       pla                     ; Restore C
 
 ; Plot a character - also used as internal function
 
-_cputc         = PRINT         ; let the kernal handle it
+_cputc: cmp            #$0A            ; CR?
+               beq     cr              ; Output a cr
+
+       cmp     #$0D            ; LF?
+               bne     L2
+               jmp     NEWLINE         ; Update cursor position
+
+; Printable char of some sort
+
+L2:    cmp     #' '
+               bcc     L4              ; Other control char
+       tay
+       bmi     L5
+       cmp     #$60
+       bcc     L3
+       and     #$DF
+       bne     L4              ; Branch always
+L3:    and     #$3F
+L4:     jmp     PRINT                  ; Output character
+
+; Handle character if high bit set
+
+L5:    and     #$7F
+               cmp     #$7E            ; PI?
+       bne     L6
+       lda     #$5E            ; Load screen code for PI
+       bne     L4
+L6:    ora     #$40
+       bne     L4              ; Branch always
 
-cputdirect     = $c33b
+; Carriage return
 
-newline:
-       lda     #17
-       jmp     PRINT
+cr:    lda     #0
+       sta     CURS_X
 
 ; Set cursor position, calculate RAM pointers
 
 plot:  ldy     CURS_X
        ldx     CURS_Y
        clc
-       jmp     PLOT            ; Set the new cursor
+       jmp     PLOT            ; Set the new cursor
 
 ; Write one character to the screen without doing anything else, return X
 ; position in Y
@@ -45,10 +78,11 @@ plot:       ldy     CURS_X
 putchar        = $CC2F
 
 ;--------------------------------------------------------------------------
-; Module constructor/destructor
+; Module constructor/destructor. Don't move the constructor into the INIT
+; segment, because it shares most of the code with the destructor.
 
 initcputc:
-       lda     #$80
+       lda     #$C0
         .byte   $2C
 donecputc:
         lda     #$00