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159 lines
2.9 KiB
ArmAsm
159 lines
2.9 KiB
ArmAsm
;
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; int vcprintf (const char* Format, va_list ap);
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;
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; Ullrich von Bassewitz, 2.12.2000
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;
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.export _vcprintf
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.import pushax, popax
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.import __printf, _cputc
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.importzp sp, ptr1, ptr2, ptr3, tmp1
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.macpack generic
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.data
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; ----------------------------------------------------------------------------
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;
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; Static data for the _vsprintf routine
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;
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outdesc: ; Static outdesc structure
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.word 0 ; ccount
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.word out ; Output function pointer
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.word 0 ; ptr
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.word 0 ; uns
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.code
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; ----------------------------------------------------------------------------
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; Callback routine used for the actual output.
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;
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; static void out (struct outdesc* d, const char* buf, unsigned count)
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; /* Routine used for writing */
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; {
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; /* Fast screen output */
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; d->ccount += count;
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; while (count) {
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; cputc (*buf);
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; ++buf;
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; --count;
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; }
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; }
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;
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; We're using ptr1 and tmp1, since we know that the cputc routine will not use
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; them (they're also used in cputs, so they must be safe).
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out: jsr popax ; count
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sta ptr2
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eor #$FF
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sta outdesc+6
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txa
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sta ptr2+1
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eor #$FF
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sta outdesc+7
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jsr popax ; buf
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sta ptr1
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stx ptr1+1
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jsr popax ; d
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sta ptr3
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stx ptr3+1
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; Sum up the total count of characters
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ldy #0 ; ccount in struct outdesc
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sty tmp1 ; Initialize tmp1 while we have zero available
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lda (ptr3),y
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add ptr2
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sta (ptr3),y
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iny
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lda (ptr3),y
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adc ptr2+1
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sta (ptr3),y
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; Loop outputting characters
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@L1: inc outdesc+6
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beq @L4
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@L2: ldy tmp1
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lda (ptr1),y
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iny
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bne @L3
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inc ptr1+1
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@L3: sty tmp1
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jsr _cputc
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jmp @L1
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@L4: inc outdesc+7
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bne @L2
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rts
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; ----------------------------------------------------------------------------
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; vcprintf - formatted console i/o
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;
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; int vcprintf (const char* format, va_list ap)
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; {
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; struct outdesc d;
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;
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; /* Setup descriptor */
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; d.fout = out;
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;
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; /* Do formatting and output */
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; _printf (&d, format, ap);
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;
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; /* Return bytes written */
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; return d.ccount;
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; }
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;
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; It is intentional that this function does not have __fastcall__ calling
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; conventions - we need the space on the stack anyway, so there's nothing
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; gained by using __fastcall__.
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_vcprintf:
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sta ptr1 ; Save ap
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stx ptr1+1
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; Setup the outdesc structure
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lda #0
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sta outdesc
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sta outdesc+1 ; Clear ccount
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; Get the format parameter and push it again
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ldy #1
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lda (sp),y
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tax
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dey
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lda (sp),y
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jsr pushax
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; Replace the passed format parameter on the stack by &d - this creates
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; exactly the stack frame _printf expects. Parameters will get dropped
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; by _printf.
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ldy #2 ; Low byte of d
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lda #<outdesc
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sta (sp),y
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iny
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lda #>outdesc
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sta (sp),y
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; Restore ap and call _printf
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lda ptr1
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ldx ptr1+1
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jsr __printf
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; Return the number of bytes written.
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lda outdesc ; ccount
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ldx outdesc+1
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rts
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