cc65/libsrc/conio/cprintf.s

;
; int cprintf (const char* Format, ...);
;
; Ullrich von Bassewitz, 1.12.2000
;

       	.export	      	_cprintf
       	.import		pushax, addysp, _vcprintf
	.importzp	sp, ptr1

	.macpack	generic

; ----------------------------------------------------------------------------
; Data

.bss

ParamSize: 	.res  	1 		; Number of parameter bytes

; ----------------------------------------------------------------------------
; Code

.code


_cprintf:
  	sty	ParamSize 		; Number of param bytes passed in Y

; Calculate a pointer that points to Format

  	dey
  	dey				; Sub size of Format
	tya
	add	sp
	sta	ptr1
	ldx	sp+1
	bcc	@L1
	inx
@L1:	stx	ptr1+1

; Push Format

	ldy	#1
	lda	(ptr1),y
	tax
	dey
	lda	(ptr1),y
	jsr	pushax

; Load va_list (last and __fastcall__ parameter to vfprintf)

	lda    	ptr1
	ldx    	ptr1+1

; Call vcprintf

	jsr    	_vcprintf

; Cleanup the stack. We will return what we got from vcprintf

	ldy	ParamSize
	jmp	addysp